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1314 lines
45 KiB
C
1314 lines
45 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Copyright (C) 2009 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author:
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* Emmanuele Bassi <ebassi@linux.intel.com>
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*/
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/**
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* SECTION:clutter-layout-manager
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* @short_description: Layout managers base class
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*
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* #ClutterLayoutManager is a base abstract class for layout managers. A
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* layout manager implements the layouting policy for a composite or a
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* container actor: it controls the preferred size of the actor to which
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* it has been paired, and it controls the allocation of its children.
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*
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* Any composite or container #ClutterActor subclass can delegate the
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* layouting of its children to a #ClutterLayoutManager. Clutter provides
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* a generic container using #ClutterLayoutManager called #ClutterBox.
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*
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* Clutter provides some simple #ClutterLayoutManager sub-classes, like
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* #ClutterFlowLayout and #ClutterBinLayout.
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*
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* <refsect2 id="ClutterLayoutManager-use-in-Actor">
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* <title>Using a Layout Manager inside an Actor</title>
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* <para>In order to use a #ClutterLayoutManager inside a #ClutterActor
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* sub-class you should invoke clutter_layout_manager_get_preferred_width()
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* inside the #ClutterActorClass.get_preferred_width() virtual function and
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* clutter_layout_manager_get_preferred_height() inside the
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* #ClutterActorClass.get_preferred_height() virtual functions implementation.
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* You should also call clutter_layout_manager_allocate() inside the
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* implementation of the #ClutterActorClass.allocate() virtual function.</para>
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* <para>In order to receive notifications for changes in the layout
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* manager policies you should also connect to the
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* #ClutterLayoutManager::layout-changed signal and queue a relayout
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* on your actor. The following code should be enough if the actor
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* does not need to perform specific operations whenever a layout
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* manager changes:</para>
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* <informalexample><programlisting>
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* g_signal_connect_swapped (layout_manager,
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* "layout-changed",
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* G_CALLBACK (clutter_actor_queue_relayout),
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* actor);
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* </programlisting></informalexample>
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* </refsect2>
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*
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* <refsect2 id="ClutterLayoutManager-implementation">
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* <title>Implementing a ClutterLayoutManager</title>
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* <para>The implementation of a layout manager does not differ from
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* the implementation of the size requisition and allocation bits of
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* #ClutterActor, so you should read the relative documentation
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* <link linkend="clutter-subclassing-ClutterActor">for subclassing
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* ClutterActor</link>.</para>
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* <para>The layout manager implementation can hold a back pointer
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* to the #ClutterContainer by implementing the
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* <function>set_container()</function> virtual function. The layout manager
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* should not hold a real reference (i.e. call g_object_ref()) on the
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* container actor, to avoid reference cycles.</para>
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* <para>If a layout manager has properties affecting the layout
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* policies then it should emit the #ClutterLayoutManager::layout-changed
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* signal on itself by using the clutter_layout_manager_layout_changed()
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* function whenever one of these properties changes.</para>
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* </refsect2>
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*
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* <refsect2 id="ClutterLayoutManager-animation">
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* <title>Animating a ClutterLayoutManager</title>
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* <para>A layout manager is used to let a #ClutterContainer take complete
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* ownership over the layout (that is: the position and sizing) of its
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* children; this means that using the Clutter animation API, like
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* clutter_actor_animate(), to animate the position and sizing of a child of
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* a layout manager it is not going to work properly, as the animation will
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* automatically override any setting done by the layout manager
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* itself.</para>
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* <para>It is possible for a #ClutterLayoutManager sub-class to animate its
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* children layout by using the base class animation support. The
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* #ClutterLayoutManager animation support consists of three virtual
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* functions: #ClutterLayoutManagerClass.begin_animation(),
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* #ClutterLayoutManagerClass.get_animation_progress(), and
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* #ClutterLayoutManagerClass.end_animation().</para>
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* <variablelist>
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* <varlistentry>
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* <term><function>begin_animation (duration, easing)</function></term>
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* <listitem><para>This virtual function is invoked when the layout
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* manager should begin an animation. The implementation should set up
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* the state for the animation and create the ancillary objects for
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* animating the layout. The default implementation creates a
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* #ClutterTimeline for the given duration and a #ClutterAlpha binding
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* the timeline to the given easing mode. This function returns a
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* #ClutterAlpha which should be used to control the animation from
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* the caller perspective.</para></listitem>
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* </varlistentry>
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* <varlistentry>
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* <term><function>get_animation_progress()</function></term>
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* <listitem><para>This virtual function should be invoked when animating
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* a layout manager. It returns the progress of the animation, using the
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* same semantics as the #ClutterAlpha:alpha value.</para></listitem>
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* </varlistentry>
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* <varlistentry>
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* <term><function>end_animation()</function></term>
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* <listitem><para>This virtual function is invoked when the animation of
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* a layout manager ends, and it is meant to be used for bookkeeping the
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* objects created in the <function>begin_animation()</function>
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* function. The default implementation will call it implicitly when the
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* timeline is complete.</para></listitem>
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* </varlistentry>
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* </variablelist>
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* <para>The simplest way to animate a layout is to create a #ClutterTimeline
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* inside the <function>begin_animation()</function> virtual function, along
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* with a #ClutterAlpha, and for each #ClutterTimeline::new-frame signal
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* emission call clutter_layout_manager_layout_changed(), which will cause a
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* relayout. The #ClutterTimeline::completed signal emission should cause
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* clutter_layout_manager_end_animation() to be called. The default
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* implementation provided internally by #ClutterLayoutManager does exactly
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* this, so most sub-classes should either not override any animation-related
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* virtual function or simply override #ClutterLayoutManagerClass.begin_animation()
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* and #ClutterLayoutManagerClass.end_animation() to set up ad hoc state, and then
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* chain up to the parent's implementation.</para>
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* <example id="example-ClutterLayoutManager-animation">
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* <title>Animation of a Layout Manager</title>
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* <para>The code below shows how a #ClutterLayoutManager sub-class should
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* provide animating the allocation of its children from within the
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* #ClutterLayoutManagerClass.allocate() virtual function implementation. The
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* animation is computed between the last stable allocation performed
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* before the animation started and the desired final allocation.</para>
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* <para>The <varname>is_animating</varname> variable is stored inside the
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* #ClutterLayoutManager sub-class and it is updated by overriding the
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* #ClutterLayoutManagerClass.begin_animation() and the
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* #ClutterLayoutManagerClass.end_animation() virtual functions and chaining up
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* to the base class implementation.</para>
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* <para>The last stable allocation is stored within a #ClutterLayoutMeta
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* sub-class used by the implementation.</para>
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* <programlisting>
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* static void
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* my_layout_manager_allocate (ClutterLayoutManager *manager,
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* ClutterContainer *container,
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* const ClutterActorBox *allocation,
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* ClutterAllocationFlags flags)
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* {
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* MyLayoutManager *self = MY_LAYOUT_MANAGER (manager);
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* ClutterActor *child;
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*
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* for (child = clutter_actor_get_first_child (CLUTTER_ACTOR (container));
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* child != NULL;
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* child = clutter_actor_get_next_sibling (child))
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* {
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* ClutterLayoutMeta *meta;
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* MyLayoutMeta *my_meta;
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*
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* /* retrieve the layout meta-object */
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* meta = clutter_layout_manager_get_child_meta (manager,
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* container,
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* child);
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* my_meta = MY_LAYOUT_META (meta);
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*
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* /* compute the desired allocation for the child */
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* compute_allocation (self, my_meta, child,
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* allocation, flags,
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* &child_box);
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*
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* /* this is the additional code that deals with the animation
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* * of the layout manager
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* */
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* if (!self->is_animating)
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* {
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* /* store the last stable allocation for later use */
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* my_meta->last_alloc = clutter_actor_box_copy (&child_box);
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* }
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* else
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* {
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* ClutterActorBox end = { 0, };
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* gdouble p;
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*
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* /* get the progress of the animation */
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* p = clutter_layout_manager_get_animation_progress (manager);
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*
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* if (my_meta->last_alloc != NULL)
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* {
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* /* copy the desired allocation as the final state */
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* end = child_box;
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*
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* /* then interpolate the initial and final state
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* * depending on the progress of the animation,
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* * and put the result inside the box we will use
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* * to allocate the child
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* */
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* clutter_actor_box_interpolate (my_meta->last_alloc,
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* &end,
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* p,
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* &child_box);
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* }
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* else
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* {
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* /* if there is no stable allocation then the child was
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* * added while animating; one possible course of action
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* * is to just bail out and fall through to the allocation
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* * to position the child directly at its final state
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* */
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* my_meta->last_alloc =
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* clutter_actor_box_copy (&child_box);
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* }
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* }
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*
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* /* allocate the child */
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* clutter_actor_allocate (child, &child_box, flags);
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* }
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* }
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* </programlisting>
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* </example>
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* <para>Sub-classes of #ClutterLayoutManager that support animations of the
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* layout changes should call clutter_layout_manager_begin_animation()
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* whenever a layout property changes value, e.g.:</para>
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* <informalexample>
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* <programlisting>
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* if (self->orientation != new_orientation)
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* {
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* ClutterLayoutManager *manager;
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*
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* self->orientation = new_orientation;
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*
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* manager = CLUTTER_LAYOUT_MANAGER (self);
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* clutter_layout_manager_layout_changed (manager);
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* clutter_layout_manager_begin_animation (manager, 500, CLUTTER_LINEAR);
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*
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* g_object_notify (G_OBJECT (self), "orientation");
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* }
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* </programlisting>
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* </informalexample>
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* <para>The code above will animate a change in the
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* <varname>orientation</varname> layout property of a layout manager.</para>
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* </refsect2>
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*
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* <refsect2 id="clutter-layout-properties">
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* <title>Layout Properties</title>
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* <para>If a layout manager has layout properties, that is properties that
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* should exist only as the result of the presence of a specific (layout
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* manager, container actor, child actor) combination, and it wishes to store
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* those properties inside a #ClutterLayoutMeta, then it should override the
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* #ClutterLayoutManagerClass.get_child_meta_type() virtual function to return
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* the #GType of the #ClutterLayoutMeta sub-class used to store the layout
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* properties; optionally, the #ClutterLayoutManager sub-class might also
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* override the #ClutterLayoutManagerClass.create_child_meta() virtual function
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* to control how the #ClutterLayoutMeta instance is created, otherwise the
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* default implementation will be equivalent to:</para>
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* <informalexample><programlisting>
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* ClutterLayoutManagerClass *klass;
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* GType meta_type;
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*
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* klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
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* meta_type = klass->get_child_meta_type (manager);
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*
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* return g_object_new (meta_type,
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* "manager", manager,
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* "container", container,
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* "actor", actor,
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* NULL);
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* </programlisting></informalexample>
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* <para>Where <varname>manager</varname> is the #ClutterLayoutManager,
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* <varname>container</varname> is the #ClutterContainer using the
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* #ClutterLayoutManager and <varname>actor</varname> is the #ClutterActor
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* child of the #ClutterContainer.</para>
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* </refsect2>
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*
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* <refsect2 id="clutter-layout-script">
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* <title>Using ClutterLayoutManager with ClutterScript</title>
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* <para>#ClutterLayoutManager instance can be created in the same way
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* as other objects in #ClutterScript; properties can be set using the
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* common syntax.</para>
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* <para>Layout properties can be set on children of a container with
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* a #ClutterLayoutManager using the <emphasis>layout::</emphasis>
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* modifier on the property name, for instance:</para>
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* <informalexample><programlisting>
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* {
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* "type" : "ClutterBox",
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* "layout-manager" : { "type" : "ClutterTableLayout" },
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* "children" : [
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* {
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* "type" : "ClutterTexture",
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* "filename" : "image-00.png",
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*
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* "layout::row" : 0,
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* "layout::column" : 0,
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* "layout::x-align" : "left",
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* "layout::y-align" : "center",
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* "layout::x-expand" : true,
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* "layout::y-expand" : true
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* },
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* {
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* "type" : "ClutterTexture",
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* "filename" : "image-01.png",
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*
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* "layout::row" : 0,
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* "layout::column" : 1,
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* "layout::x-align" : "right",
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* "layout::y-align" : "center",
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* "layout::x-expand" : true,
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* "layout::y-expand" : true
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* }
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* ]
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* }
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* </programlisting></informalexample>
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* </refsect2>
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*
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* #ClutterLayoutManager is available since Clutter 1.2
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <glib-object.h>
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#include <gobject/gvaluecollector.h>
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#define CLUTTER_DISABLE_DEPRECATION_WARNINGS
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#include "deprecated/clutter-container.h"
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#include "deprecated/clutter-alpha.h"
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#include "clutter-debug.h"
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#include "clutter-layout-manager.h"
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#include "clutter-layout-meta.h"
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#include "clutter-marshal.h"
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#include "clutter-private.h"
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#include "clutter-timeline.h"
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#define LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED(m,method) G_STMT_START { \
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GObject *_obj = G_OBJECT (m); \
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g_warning ("Layout managers of type %s do not implement " \
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"the ClutterLayoutManager::%s method", \
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G_OBJECT_TYPE_NAME (_obj), \
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(method)); } G_STMT_END
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struct _ClutterLayoutManagerPrivate
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{
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gpointer dummy;
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};
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enum
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{
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LAYOUT_CHANGED,
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LAST_SIGNAL
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};
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G_DEFINE_ABSTRACT_TYPE (ClutterLayoutManager,
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clutter_layout_manager,
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G_TYPE_INITIALLY_UNOWNED);
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static GQuark quark_layout_meta = 0;
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static GQuark quark_layout_alpha = 0;
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static guint manager_signals[LAST_SIGNAL] = { 0, };
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static void
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layout_manager_freeze_layout_change (ClutterLayoutManager *manager)
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{
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gpointer is_frozen;
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CLUTTER_NOTE (LAYOUT, "Freezing changes for manager '%s'[%p]",
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G_OBJECT_TYPE_NAME (manager),
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manager);
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is_frozen = g_object_get_data (G_OBJECT (manager), "freeze-change");
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if (is_frozen == NULL)
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g_object_set_data (G_OBJECT (manager), "freeze-change",
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GUINT_TO_POINTER (1));
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else
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{
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guint level = GPOINTER_TO_UINT (is_frozen) + 1;
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g_object_set_data (G_OBJECT (manager), "freeze-change",
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GUINT_TO_POINTER (level));
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}
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}
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static void
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layout_manager_thaw_layout_change (ClutterLayoutManager *manager)
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{
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gpointer is_frozen;
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is_frozen = g_object_get_data (G_OBJECT (manager), "freeze-change");
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if (is_frozen == NULL)
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g_critical (G_STRLOC ": Mismatched thaw; you have to call "
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"clutter_layout_manager_freeze_layout_change() prior to "
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"calling clutter_layout_manager_thaw_layout_change()");
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else
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{
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guint level = GPOINTER_TO_UINT (is_frozen);
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g_assert (level > 0);
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CLUTTER_NOTE (LAYOUT, "Thawing changes for manager '%s'[%p]",
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G_OBJECT_TYPE_NAME (manager),
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manager);
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level -= 1;
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if (level == 0)
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g_object_set_data (G_OBJECT (manager), "freeze-change", NULL);
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else
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g_object_set_data (G_OBJECT (manager), "freeze-change",
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GUINT_TO_POINTER (level));
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}
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}
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static void
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layout_manager_real_get_preferred_width (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_height,
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gfloat *min_width_p,
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gfloat *nat_width_p)
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{
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LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "get_preferred_width");
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if (min_width_p)
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*min_width_p = 0.0;
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if (nat_width_p)
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*nat_width_p = 0.0;
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}
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static void
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layout_manager_real_get_preferred_height (ClutterLayoutManager *manager,
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ClutterContainer *container,
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gfloat for_width,
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gfloat *min_height_p,
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gfloat *nat_height_p)
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{
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LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "get_preferred_height");
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if (min_height_p)
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*min_height_p = 0.0;
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if (nat_height_p)
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*nat_height_p = 0.0;
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}
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static void
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layout_manager_real_allocate (ClutterLayoutManager *manager,
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ClutterContainer *container,
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const ClutterActorBox *allocation,
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ClutterAllocationFlags flags)
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{
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LAYOUT_MANAGER_WARN_NOT_IMPLEMENTED (manager, "allocate");
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}
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static void
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layout_manager_real_set_container (ClutterLayoutManager *manager,
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ClutterContainer *container)
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{
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if (container != NULL)
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|
g_object_set_data (G_OBJECT (container), "clutter-layout-manager", manager);
|
|
}
|
|
|
|
static ClutterLayoutMeta *
|
|
layout_manager_real_create_child_meta (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
ClutterActor *actor)
|
|
{
|
|
ClutterLayoutManagerClass *klass;
|
|
GType meta_type;
|
|
|
|
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
|
|
meta_type = klass->get_child_meta_type (manager);
|
|
|
|
/* provide a default implementation to reduce common code */
|
|
if (meta_type != G_TYPE_INVALID)
|
|
{
|
|
g_assert (g_type_is_a (meta_type, CLUTTER_TYPE_LAYOUT_META));
|
|
|
|
return g_object_new (meta_type,
|
|
"manager", manager,
|
|
"container", container,
|
|
"actor", actor,
|
|
NULL);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static GType
|
|
layout_manager_real_get_child_meta_type (ClutterLayoutManager *manager)
|
|
{
|
|
return G_TYPE_INVALID;
|
|
}
|
|
|
|
/* XXX:2.0 - Remove */
|
|
static ClutterAlpha *
|
|
layout_manager_real_begin_animation (ClutterLayoutManager *manager,
|
|
guint duration,
|
|
gulong mode)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
ClutterAlpha *alpha;
|
|
|
|
alpha = g_object_get_qdata (G_OBJECT (manager), quark_layout_alpha);
|
|
if (alpha != NULL)
|
|
{
|
|
clutter_alpha_set_mode (alpha, mode);
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
clutter_timeline_set_duration (timeline, duration);
|
|
clutter_timeline_rewind (timeline);
|
|
|
|
return alpha;
|
|
};
|
|
|
|
timeline = clutter_timeline_new (duration);
|
|
|
|
alpha = clutter_alpha_new_full (timeline, mode);
|
|
|
|
/* let the alpha take ownership of the timeline */
|
|
g_object_unref (timeline);
|
|
|
|
g_signal_connect_swapped (timeline, "completed",
|
|
G_CALLBACK (clutter_layout_manager_end_animation),
|
|
manager);
|
|
g_signal_connect_swapped (timeline, "new-frame",
|
|
G_CALLBACK (clutter_layout_manager_layout_changed),
|
|
manager);
|
|
|
|
g_object_set_qdata_full (G_OBJECT (manager),
|
|
quark_layout_alpha, alpha,
|
|
(GDestroyNotify) g_object_unref);
|
|
|
|
clutter_timeline_start (timeline);
|
|
|
|
return alpha;
|
|
}
|
|
|
|
/* XXX:2.0 - Remove */
|
|
static gdouble
|
|
layout_manager_real_get_animation_progress (ClutterLayoutManager *manager)
|
|
{
|
|
ClutterAlpha *alpha;
|
|
|
|
alpha = g_object_get_qdata (G_OBJECT (manager), quark_layout_alpha);
|
|
if (alpha == NULL)
|
|
return 1.0;
|
|
|
|
return clutter_alpha_get_alpha (alpha);
|
|
}
|
|
|
|
/* XXX:2.0 - Remove */
|
|
static void
|
|
layout_manager_real_end_animation (ClutterLayoutManager *manager)
|
|
{
|
|
ClutterTimeline *timeline;
|
|
ClutterAlpha *alpha;
|
|
|
|
alpha = g_object_get_qdata (G_OBJECT (manager), quark_layout_alpha);
|
|
if (alpha == NULL)
|
|
return;
|
|
|
|
timeline = clutter_alpha_get_timeline (alpha);
|
|
g_assert (timeline != NULL);
|
|
|
|
if (clutter_timeline_is_playing (timeline))
|
|
clutter_timeline_stop (timeline);
|
|
|
|
g_signal_handlers_disconnect_by_func (timeline,
|
|
G_CALLBACK (clutter_layout_manager_end_animation),
|
|
manager);
|
|
g_signal_handlers_disconnect_by_func (timeline,
|
|
G_CALLBACK (clutter_layout_manager_layout_changed),
|
|
manager);
|
|
|
|
g_object_set_qdata (G_OBJECT (manager), quark_layout_alpha, NULL);
|
|
|
|
clutter_layout_manager_layout_changed (manager);
|
|
}
|
|
|
|
static void
|
|
clutter_layout_manager_class_init (ClutterLayoutManagerClass *klass)
|
|
{
|
|
quark_layout_meta =
|
|
g_quark_from_static_string ("clutter-layout-manager-child-meta");
|
|
|
|
/* XXX:2.0 - Remove */
|
|
quark_layout_alpha =
|
|
g_quark_from_static_string ("clutter-layout-manager-alpha");
|
|
|
|
g_type_class_add_private (klass, sizeof (ClutterLayoutManagerPrivate));
|
|
|
|
klass->get_preferred_width = layout_manager_real_get_preferred_width;
|
|
klass->get_preferred_height = layout_manager_real_get_preferred_height;
|
|
klass->allocate = layout_manager_real_allocate;
|
|
klass->create_child_meta = layout_manager_real_create_child_meta;
|
|
klass->get_child_meta_type = layout_manager_real_get_child_meta_type;
|
|
|
|
/* XXX:2.0 - Remove */
|
|
klass->begin_animation = layout_manager_real_begin_animation;
|
|
klass->get_animation_progress = layout_manager_real_get_animation_progress;
|
|
klass->end_animation = layout_manager_real_end_animation;
|
|
klass->set_container = layout_manager_real_set_container;
|
|
|
|
/**
|
|
* ClutterLayoutManager::layout-changed:
|
|
* @manager: the #ClutterLayoutManager that emitted the signal
|
|
*
|
|
* The ::layout-changed signal is emitted each time a layout manager
|
|
* has been changed. Every #ClutterActor using the @manager instance
|
|
* as a layout manager should connect a handler to the ::layout-changed
|
|
* signal and queue a relayout on themselves:
|
|
*
|
|
* |[
|
|
* static void layout_changed (ClutterLayoutManager *manager,
|
|
* ClutterActor *self)
|
|
* {
|
|
* clutter_actor_queue_relayout (self);
|
|
* }
|
|
* ...
|
|
* self->manager = g_object_ref_sink (manager);
|
|
* g_signal_connect (self->manager, "layout-changed",
|
|
* G_CALLBACK (layout_changed),
|
|
* self);
|
|
* ]|
|
|
*
|
|
* Sub-classes of #ClutterLayoutManager that implement a layout that
|
|
* can be controlled or changed using parameters should emit the
|
|
* ::layout-changed signal whenever one of the parameters changes,
|
|
* by using clutter_layout_manager_layout_changed().
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
manager_signals[LAYOUT_CHANGED] =
|
|
g_signal_new (I_("layout-changed"),
|
|
G_TYPE_FROM_CLASS (klass),
|
|
G_SIGNAL_RUN_LAST,
|
|
G_STRUCT_OFFSET (ClutterLayoutManagerClass,
|
|
layout_changed),
|
|
NULL, NULL,
|
|
_clutter_marshal_VOID__VOID,
|
|
G_TYPE_NONE, 0);
|
|
}
|
|
|
|
static void
|
|
clutter_layout_manager_init (ClutterLayoutManager *manager)
|
|
{
|
|
manager->priv =
|
|
G_TYPE_INSTANCE_GET_PRIVATE (manager, CLUTTER_TYPE_LAYOUT_MANAGER,
|
|
ClutterLayoutManagerPrivate);
|
|
}
|
|
|
|
/**
|
|
* clutter_layout_manager_get_preferred_width:
|
|
* @manager: a #ClutterLayoutManager
|
|
* @container: the #ClutterContainer using @manager
|
|
* @for_height: the height for which the width should be computed, or -1
|
|
* @min_width_p: (out) (allow-none): return location for the minimum width
|
|
* of the layout, or %NULL
|
|
* @nat_width_p: (out) (allow-none): return location for the natural width
|
|
* of the layout, or %NULL
|
|
*
|
|
* Computes the minimum and natural widths of the @container according
|
|
* to @manager.
|
|
*
|
|
* See also clutter_actor_get_preferred_width()
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
void
|
|
clutter_layout_manager_get_preferred_width (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
gfloat for_height,
|
|
gfloat *min_width_p,
|
|
gfloat *nat_width_p)
|
|
{
|
|
ClutterLayoutManagerClass *klass;
|
|
|
|
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
|
|
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
|
|
|
|
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
|
|
klass->get_preferred_width (manager, container, for_height,
|
|
min_width_p,
|
|
nat_width_p);
|
|
}
|
|
|
|
/**
|
|
* clutter_layout_manager_get_preferred_height:
|
|
* @manager: a #ClutterLayoutManager
|
|
* @container: the #ClutterContainer using @manager
|
|
* @for_width: the width for which the height should be computed, or -1
|
|
* @min_height_p: (out) (allow-none): return location for the minimum height
|
|
* of the layout, or %NULL
|
|
* @nat_height_p: (out) (allow-none): return location for the natural height
|
|
* of the layout, or %NULL
|
|
*
|
|
* Computes the minimum and natural heights of the @container according
|
|
* to @manager.
|
|
*
|
|
* See also clutter_actor_get_preferred_height()
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
void
|
|
clutter_layout_manager_get_preferred_height (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
gfloat for_width,
|
|
gfloat *min_height_p,
|
|
gfloat *nat_height_p)
|
|
{
|
|
ClutterLayoutManagerClass *klass;
|
|
|
|
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
|
|
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
|
|
|
|
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
|
|
klass->get_preferred_height (manager, container, for_width,
|
|
min_height_p,
|
|
nat_height_p);
|
|
}
|
|
|
|
/**
|
|
* clutter_layout_manager_allocate:
|
|
* @manager: a #ClutterLayoutManager
|
|
* @container: the #ClutterContainer using @manager
|
|
* @allocation: the #ClutterActorBox containing the allocated area
|
|
* of @container
|
|
* @flags: the allocation flags
|
|
*
|
|
* Allocates the children of @container given an area
|
|
*
|
|
* See also clutter_actor_allocate()
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
void
|
|
clutter_layout_manager_allocate (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
const ClutterActorBox *allocation,
|
|
ClutterAllocationFlags flags)
|
|
{
|
|
ClutterLayoutManagerClass *klass;
|
|
|
|
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
|
|
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
|
|
g_return_if_fail (allocation != NULL);
|
|
|
|
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
|
|
klass->allocate (manager, container, allocation, flags);
|
|
}
|
|
|
|
/**
|
|
* clutter_layout_manager_layout_changed:
|
|
* @manager: a #ClutterLayoutManager
|
|
*
|
|
* Emits the #ClutterLayoutManager::layout-changed signal on @manager
|
|
*
|
|
* This function should only be called by implementations of the
|
|
* #ClutterLayoutManager class
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
void
|
|
clutter_layout_manager_layout_changed (ClutterLayoutManager *manager)
|
|
{
|
|
gpointer is_frozen;
|
|
|
|
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
|
|
|
|
is_frozen = g_object_get_data (G_OBJECT (manager), "freeze-change");
|
|
if (is_frozen == NULL)
|
|
g_signal_emit (manager, manager_signals[LAYOUT_CHANGED], 0);
|
|
else
|
|
CLUTTER_NOTE (LAYOUT, "Layout manager '%s'[%p] has been frozen",
|
|
G_OBJECT_TYPE_NAME (manager),
|
|
manager);
|
|
}
|
|
|
|
/**
|
|
* clutter_layout_manager_set_container:
|
|
* @manager: a #ClutterLayoutManager
|
|
* @container: (allow-none): a #ClutterContainer using @manager
|
|
*
|
|
* If the #ClutterLayoutManager sub-class allows it, allow
|
|
* adding a weak reference of the @container using @manager
|
|
* from within the layout manager
|
|
*
|
|
* The layout manager should not increase the reference
|
|
* count of the @container
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
void
|
|
clutter_layout_manager_set_container (ClutterLayoutManager *manager,
|
|
ClutterContainer *container)
|
|
{
|
|
ClutterLayoutManagerClass *klass;
|
|
|
|
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
|
|
g_return_if_fail (container == NULL || CLUTTER_IS_CONTAINER (container));
|
|
|
|
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
|
|
if (klass->set_container)
|
|
klass->set_container (manager, container);
|
|
}
|
|
|
|
GType
|
|
_clutter_layout_manager_get_child_meta_type (ClutterLayoutManager *manager)
|
|
{
|
|
return CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager)->get_child_meta_type (manager);
|
|
}
|
|
|
|
static inline ClutterLayoutMeta *
|
|
create_child_meta (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
ClutterActor *actor)
|
|
{
|
|
ClutterLayoutManagerClass *klass;
|
|
ClutterLayoutMeta *meta = NULL;
|
|
|
|
layout_manager_freeze_layout_change (manager);
|
|
|
|
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
|
|
if (klass->get_child_meta_type (manager) != G_TYPE_INVALID)
|
|
meta = klass->create_child_meta (manager, container, actor);
|
|
|
|
layout_manager_thaw_layout_change (manager);
|
|
|
|
return meta;
|
|
}
|
|
|
|
static inline ClutterLayoutMeta *
|
|
get_child_meta (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
ClutterActor *actor)
|
|
{
|
|
ClutterLayoutMeta *layout = NULL;
|
|
|
|
layout = g_object_get_qdata (G_OBJECT (actor), quark_layout_meta);
|
|
if (layout != NULL)
|
|
{
|
|
ClutterChildMeta *child = CLUTTER_CHILD_META (layout);
|
|
|
|
if (layout->manager == manager &&
|
|
child->container == container &&
|
|
child->actor == actor)
|
|
return layout;
|
|
|
|
/* if the LayoutMeta referenced is not attached to the
|
|
* layout manager then we simply ask the layout manager
|
|
* to replace it with the right one
|
|
*/
|
|
}
|
|
|
|
layout = create_child_meta (manager, container, actor);
|
|
if (layout != NULL)
|
|
{
|
|
g_assert (CLUTTER_IS_LAYOUT_META (layout));
|
|
g_object_set_qdata_full (G_OBJECT (actor), quark_layout_meta,
|
|
layout,
|
|
(GDestroyNotify) g_object_unref);
|
|
return layout;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* clutter_layout_manager_get_child_meta:
|
|
* @manager: a #ClutterLayoutManager
|
|
* @container: a #ClutterContainer using @manager
|
|
* @actor: a #ClutterActor child of @container
|
|
*
|
|
* Retrieves the #ClutterLayoutMeta that the layout @manager associated
|
|
* to the @actor child of @container, eventually by creating one if the
|
|
* #ClutterLayoutManager supports layout properties
|
|
*
|
|
* Return value: (transfer none): a #ClutterLayoutMeta, or %NULL if the
|
|
* #ClutterLayoutManager does not have layout properties. The returned
|
|
* layout meta instance is owned by the #ClutterLayoutManager and it
|
|
* should not be unreferenced
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
ClutterLayoutMeta *
|
|
clutter_layout_manager_get_child_meta (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
ClutterActor *actor)
|
|
{
|
|
g_return_val_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager), NULL);
|
|
g_return_val_if_fail (CLUTTER_IS_CONTAINER (container), NULL);
|
|
g_return_val_if_fail (CLUTTER_IS_ACTOR (actor), NULL);
|
|
|
|
return get_child_meta (manager, container, actor);
|
|
}
|
|
|
|
static inline gboolean
|
|
layout_set_property_internal (ClutterLayoutManager *manager,
|
|
GObject *gobject,
|
|
GParamSpec *pspec,
|
|
const GValue *value)
|
|
{
|
|
if (pspec->flags & G_PARAM_CONSTRUCT_ONLY)
|
|
{
|
|
g_warning ("%s: Child property '%s' of the layout manager of "
|
|
"type '%s' is constructor-only",
|
|
G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (manager));
|
|
return FALSE;
|
|
}
|
|
|
|
if (!(pspec->flags & G_PARAM_WRITABLE))
|
|
{
|
|
g_warning ("%s: Child property '%s' of the layout manager of "
|
|
"type '%s' is not writable",
|
|
G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (manager));
|
|
return FALSE;
|
|
}
|
|
|
|
g_object_set_property (gobject, pspec->name, value);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static inline gboolean
|
|
layout_get_property_internal (ClutterLayoutManager *manager,
|
|
GObject *gobject,
|
|
GParamSpec *pspec,
|
|
GValue *value)
|
|
{
|
|
if (!(pspec->flags & G_PARAM_READABLE))
|
|
{
|
|
g_warning ("%s: Child property '%s' of the layout manager of "
|
|
"type '%s' is not readable",
|
|
G_STRLOC, pspec->name, G_OBJECT_TYPE_NAME (manager));
|
|
return FALSE;
|
|
}
|
|
|
|
g_object_get_property (gobject, pspec->name, value);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* clutter_layout_manager_child_set:
|
|
* @manager: a #ClutterLayoutManager
|
|
* @container: a #ClutterContainer using @manager
|
|
* @actor: a #ClutterActor child of @container
|
|
* @first_property: the first property name
|
|
* @...: a list of property name and value pairs
|
|
*
|
|
* Sets a list of properties and their values on the #ClutterLayoutMeta
|
|
* associated by @manager to a child of @container
|
|
*
|
|
* Languages bindings should use clutter_layout_manager_child_set_property()
|
|
* instead
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
void
|
|
clutter_layout_manager_child_set (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
ClutterActor *actor,
|
|
const gchar *first_property,
|
|
...)
|
|
{
|
|
ClutterLayoutMeta *meta;
|
|
GObjectClass *klass;
|
|
const gchar *pname;
|
|
va_list var_args;
|
|
|
|
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
|
|
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
|
|
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
|
|
g_return_if_fail (first_property != NULL);
|
|
|
|
meta = get_child_meta (manager, container, actor);
|
|
if (meta == NULL)
|
|
{
|
|
g_warning ("Layout managers of type '%s' do not support "
|
|
"layout metadata",
|
|
g_type_name (G_OBJECT_TYPE (manager)));
|
|
return;
|
|
}
|
|
|
|
klass = G_OBJECT_GET_CLASS (meta);
|
|
|
|
va_start (var_args, first_property);
|
|
|
|
pname = first_property;
|
|
while (pname)
|
|
{
|
|
GValue value = G_VALUE_INIT;
|
|
GParamSpec *pspec;
|
|
gchar *error;
|
|
gboolean res;
|
|
|
|
pspec = g_object_class_find_property (klass, pname);
|
|
if (pspec == NULL)
|
|
{
|
|
g_warning ("%s: Layout managers of type '%s' have no layout "
|
|
"property named '%s'",
|
|
G_STRLOC, G_OBJECT_TYPE_NAME (manager), pname);
|
|
break;
|
|
}
|
|
|
|
G_VALUE_COLLECT_INIT (&value, G_PARAM_SPEC_VALUE_TYPE (pspec),
|
|
var_args, 0,
|
|
&error);
|
|
|
|
if (error)
|
|
{
|
|
g_warning ("%s: %s", G_STRLOC, error);
|
|
g_free (error);
|
|
break;
|
|
}
|
|
|
|
res = layout_set_property_internal (manager, G_OBJECT (meta),
|
|
pspec,
|
|
&value);
|
|
|
|
g_value_unset (&value);
|
|
|
|
if (!res)
|
|
break;
|
|
|
|
pname = va_arg (var_args, gchar*);
|
|
}
|
|
|
|
va_end (var_args);
|
|
}
|
|
|
|
/**
|
|
* clutter_layout_manager_child_set_property:
|
|
* @manager: a #ClutterLayoutManager
|
|
* @container: a #ClutterContainer using @manager
|
|
* @actor: a #ClutterActor child of @container
|
|
* @property_name: the name of the property to set
|
|
* @value: a #GValue with the value of the property to set
|
|
*
|
|
* Sets a property on the #ClutterLayoutMeta created by @manager and
|
|
* attached to a child of @container
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
void
|
|
clutter_layout_manager_child_set_property (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
ClutterActor *actor,
|
|
const gchar *property_name,
|
|
const GValue *value)
|
|
{
|
|
ClutterLayoutMeta *meta;
|
|
GObjectClass *klass;
|
|
GParamSpec *pspec;
|
|
|
|
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
|
|
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
|
|
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
|
|
g_return_if_fail (property_name != NULL);
|
|
g_return_if_fail (value != NULL);
|
|
|
|
meta = get_child_meta (manager, container, actor);
|
|
if (meta == NULL)
|
|
{
|
|
g_warning ("Layout managers of type '%s' do not support "
|
|
"layout metadata",
|
|
g_type_name (G_OBJECT_TYPE (manager)));
|
|
return;
|
|
}
|
|
|
|
klass = G_OBJECT_GET_CLASS (meta);
|
|
|
|
pspec = g_object_class_find_property (klass, property_name);
|
|
if (pspec == NULL)
|
|
{
|
|
g_warning ("%s: Layout managers of type '%s' have no layout "
|
|
"property named '%s'",
|
|
G_STRLOC, G_OBJECT_TYPE_NAME (manager), property_name);
|
|
return;
|
|
}
|
|
|
|
layout_set_property_internal (manager, G_OBJECT (meta), pspec, value);
|
|
}
|
|
|
|
/**
|
|
* clutter_layout_manager_child_get:
|
|
* @manager: a #ClutterLayoutManager
|
|
* @container: a #ClutterContainer using @manager
|
|
* @actor: a #ClutterActor child of @container
|
|
* @first_property: the name of the first property
|
|
* @...: a list of property name and return location for the value pairs
|
|
*
|
|
* Retrieves the values for a list of properties out of the
|
|
* #ClutterLayoutMeta created by @manager and attached to the
|
|
* child of a @container
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
void
|
|
clutter_layout_manager_child_get (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
ClutterActor *actor,
|
|
const gchar *first_property,
|
|
...)
|
|
{
|
|
ClutterLayoutMeta *meta;
|
|
GObjectClass *klass;
|
|
const gchar *pname;
|
|
va_list var_args;
|
|
|
|
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
|
|
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
|
|
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
|
|
g_return_if_fail (first_property != NULL);
|
|
|
|
meta = get_child_meta (manager, container, actor);
|
|
if (meta == NULL)
|
|
{
|
|
g_warning ("Layout managers of type '%s' do not support "
|
|
"layout metadata",
|
|
g_type_name (G_OBJECT_TYPE (manager)));
|
|
return;
|
|
}
|
|
|
|
klass = G_OBJECT_GET_CLASS (meta);
|
|
|
|
va_start (var_args, first_property);
|
|
|
|
pname = first_property;
|
|
while (pname)
|
|
{
|
|
GValue value = G_VALUE_INIT;
|
|
GParamSpec *pspec;
|
|
gchar *error;
|
|
gboolean res;
|
|
|
|
pspec = g_object_class_find_property (klass, pname);
|
|
if (pspec == NULL)
|
|
{
|
|
g_warning ("%s: Layout managers of type '%s' have no layout "
|
|
"property named '%s'",
|
|
G_STRLOC, G_OBJECT_TYPE_NAME (manager), pname);
|
|
break;
|
|
}
|
|
|
|
g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
|
|
|
|
res = layout_get_property_internal (manager, G_OBJECT (meta),
|
|
pspec,
|
|
&value);
|
|
if (!res)
|
|
{
|
|
g_value_unset (&value);
|
|
break;
|
|
}
|
|
|
|
G_VALUE_LCOPY (&value, var_args, 0, &error);
|
|
if (error)
|
|
{
|
|
g_warning ("%s: %s", G_STRLOC, error);
|
|
g_free (error);
|
|
g_value_unset (&value);
|
|
break;
|
|
}
|
|
|
|
g_value_unset (&value);
|
|
|
|
pname = va_arg (var_args, gchar*);
|
|
}
|
|
|
|
va_end (var_args);
|
|
}
|
|
|
|
/**
|
|
* clutter_layout_manager_child_get_property:
|
|
* @manager: a #ClutterLayoutManager
|
|
* @container: a #ClutterContainer using @manager
|
|
* @actor: a #ClutterActor child of @container
|
|
* @property_name: the name of the property to get
|
|
* @value: a #GValue with the value of the property to get
|
|
*
|
|
* Gets a property on the #ClutterLayoutMeta created by @manager and
|
|
* attached to a child of @container
|
|
*
|
|
* The #GValue must already be initialized to the type of the property
|
|
* and has to be unset with g_value_unset() after extracting the real
|
|
* value out of it
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
void
|
|
clutter_layout_manager_child_get_property (ClutterLayoutManager *manager,
|
|
ClutterContainer *container,
|
|
ClutterActor *actor,
|
|
const gchar *property_name,
|
|
GValue *value)
|
|
{
|
|
ClutterLayoutMeta *meta;
|
|
GObjectClass *klass;
|
|
GParamSpec *pspec;
|
|
|
|
g_return_if_fail (CLUTTER_IS_LAYOUT_MANAGER (manager));
|
|
g_return_if_fail (CLUTTER_IS_CONTAINER (container));
|
|
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
|
|
g_return_if_fail (property_name != NULL);
|
|
g_return_if_fail (value != NULL);
|
|
|
|
meta = get_child_meta (manager, container, actor);
|
|
if (meta == NULL)
|
|
{
|
|
g_warning ("Layout managers of type %s do not support "
|
|
"layout metadata",
|
|
g_type_name (G_OBJECT_TYPE (manager)));
|
|
return;
|
|
}
|
|
|
|
klass = G_OBJECT_GET_CLASS (meta);
|
|
|
|
pspec = g_object_class_find_property (klass, property_name);
|
|
if (pspec == NULL)
|
|
{
|
|
g_warning ("%s: Layout managers of type '%s' have no layout "
|
|
"property named '%s'",
|
|
G_STRLOC, G_OBJECT_TYPE_NAME (manager), property_name);
|
|
return;
|
|
}
|
|
|
|
layout_get_property_internal (manager, G_OBJECT (meta), pspec, value);
|
|
}
|
|
|
|
/**
|
|
* clutter_layout_manager_find_child_property:
|
|
* @manager: a #ClutterLayoutManager
|
|
* @name: the name of the property
|
|
*
|
|
* Retrieves the #GParamSpec for the layout property @name inside
|
|
* the #ClutterLayoutMeta sub-class used by @manager
|
|
*
|
|
* Return value: (transfer none): a #GParamSpec describing the property,
|
|
* or %NULL if no property with that name exists. The returned
|
|
* #GParamSpec is owned by the layout manager and should not be
|
|
* modified or freed
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
GParamSpec *
|
|
clutter_layout_manager_find_child_property (ClutterLayoutManager *manager,
|
|
const gchar *name)
|
|
{
|
|
ClutterLayoutManagerClass *klass;
|
|
GObjectClass *meta_klass;
|
|
GParamSpec *pspec;
|
|
GType meta_type;
|
|
|
|
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
|
|
meta_type = klass->get_child_meta_type (manager);
|
|
if (meta_type == G_TYPE_INVALID)
|
|
return NULL;
|
|
|
|
meta_klass = g_type_class_ref (meta_type);
|
|
|
|
pspec = g_object_class_find_property (meta_klass, name);
|
|
|
|
g_type_class_unref (meta_klass);
|
|
|
|
return pspec;
|
|
}
|
|
|
|
/**
|
|
* clutter_layout_manager_list_child_properties:
|
|
* @manager: a #ClutterLayoutManager
|
|
* @n_pspecs: (out): return location for the number of returned
|
|
* #GParamSpec<!-- -->s
|
|
*
|
|
* Retrieves all the #GParamSpec<!-- -->s for the layout properties
|
|
* stored inside the #ClutterLayoutMeta sub-class used by @manager
|
|
*
|
|
* Return value: (transfer full) (array length=n_pspecs): the newly-allocated,
|
|
* %NULL-terminated array of #GParamSpec<!-- -->s. Use g_free() to free the
|
|
* resources allocated for the array
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
GParamSpec **
|
|
clutter_layout_manager_list_child_properties (ClutterLayoutManager *manager,
|
|
guint *n_pspecs)
|
|
{
|
|
ClutterLayoutManagerClass *klass;
|
|
GObjectClass *meta_klass;
|
|
GParamSpec **pspecs;
|
|
GType meta_type;
|
|
|
|
klass = CLUTTER_LAYOUT_MANAGER_GET_CLASS (manager);
|
|
meta_type = klass->get_child_meta_type (manager);
|
|
if (meta_type == G_TYPE_INVALID)
|
|
return NULL;
|
|
|
|
meta_klass = g_type_class_ref (meta_type);
|
|
|
|
pspecs = g_object_class_list_properties (meta_klass, n_pspecs);
|
|
|
|
g_type_class_unref (meta_klass);
|
|
|
|
return pspecs;
|
|
}
|