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cookbook: Add examples and more text for "box layout" recipe

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Added 3 examples for the box layout recipe:
1) Simple box layout demonstrating how to set actor properties
2) Trivial menu implementation using box layout
3) Demonstration app which enables tweaking and testing
   of layout property interactions

Also inlined example 1 in the solution section and added
more explanatory text in the discussion.
This commit is contained in:
Elliot Smith 2010-12-15 13:13:28 +00:00 committed by Emmanuele Bassi
parent 77aacd185d
commit accdd92110
6 changed files with 841 additions and 10 deletions
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6
doc/cookbook/examples/Makefile.am
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@ -21,6 +21,9 @@ noinst_PROGRAMS = \
layouts-bind-constraint-allocation \
layouts-bind-constraint-overlay \
layouts-bind-constraint-stage \
layouts-box \
layouts-box-menu \
layouts-box-property-effects \
layouts-stacking \
layouts-stacking-diff-sized-actors \
events-mouse-scroll \
@ -77,6 +80,9 @@ textures_sub_texture_SOURCES = textures-sub-texture.c
layouts_bind_constraint_allocation_SOURCES = layouts-bind-constraint-allocation.c
layouts_bind_constraint_overlay_SOURCES = layouts-bind-constraint-overlay.c
layouts_bind_constraint_stage_SOURCES = layouts-bind-constraint-stage.c
layouts_box_SOURCES = layouts-box.c
layouts_box_menu_SOURCES = layouts-box-menu.c
layouts_box_property_effects_SOURCES = layouts-box-property-effects.c
layouts_stacking_SOURCES = layouts-stacking.c
layouts_stacking_diff_sized_actors_SOURCES = layouts-stacking-diff-sized-actors.c
events_mouse_scroll_SOURCES = events-mouse-scroll.c

151
doc/cookbook/examples/layouts-box-menu.c Normal file
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@ -0,0 +1,151 @@
#include <stdlib.h>
#include <clutter/clutter.h>
#define FONT "Sans 20px"
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static const ClutterColor yellow_color = { 0xaa, 0xaa, 0x00, 0xff };
static const ClutterColor black_color = { 0x00, 0x00, 0x00, 0xff };
static void
menu_run_option (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
g_debug ("%s pressed", (gchar *) user_data);
}
static void
menu_add_option (ClutterBox *menu,
gchar *text,
gchar *shortcut)
{
ClutterActor *entry;
entry = clutter_box_new (clutter_bin_layout_new (CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_BIN_ALIGNMENT_CENTER));
clutter_box_set_color (CLUTTER_BOX (entry), &black_color);
clutter_actor_set_width (entry, 250);
clutter_actor_set_reactive (entry, TRUE);
clutter_box_pack (CLUTTER_BOX (entry),
clutter_text_new_full (FONT, text, &yellow_color),
"x-align", CLUTTER_BIN_ALIGNMENT_START,
NULL);
clutter_box_pack (CLUTTER_BOX (entry),
clutter_text_new_full (FONT, shortcut, &yellow_color),
"x-align", CLUTTER_BIN_ALIGNMENT_END,
NULL);
clutter_container_add_actor (CLUTTER_CONTAINER (menu), entry);
g_signal_connect (entry,
"button-press-event",
G_CALLBACK (menu_run_option),
text);
}
static void
menu_toggle (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
ClutterAnimation *animation;
ClutterActor *menu = CLUTTER_ACTOR (user_data);
if (clutter_actor_get_animation (menu))
return;
if (clutter_actor_get_opacity (menu) > 0)
{
animation = clutter_actor_animate (menu, CLUTTER_EASE_OUT_CUBIC, 200,
"opacity", 0,
NULL);
/* hide the menu once it is fully transparent */
g_signal_connect_swapped (animation,
"completed",
G_CALLBACK (clutter_actor_hide),
menu);
}
else
{
clutter_actor_show (menu);
clutter_actor_animate (menu, CLUTTER_EASE_OUT_CUBIC, 200,
"opacity", 255,
NULL);
}
}
int
main (int argc,
char *argv[])
{
ClutterActor *stage;
ClutterActor *button;
ClutterLayoutManager *menu_layout;
ClutterActor *menu;
clutter_init (&argc, &argv);
stage = clutter_stage_get_default ();
clutter_actor_set_size (stage, 400, 400);
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
/* button */
button = clutter_box_new (clutter_bin_layout_new (CLUTTER_BIN_ALIGNMENT_CENTER,
CLUTTER_BIN_ALIGNMENT_CENTER));
clutter_actor_set_width (button, 100);
clutter_actor_set_position (button, 50, 50);
clutter_actor_set_reactive (button, TRUE);
clutter_box_set_color (CLUTTER_BOX (button), &black_color);
clutter_box_pack (CLUTTER_BOX (button),
clutter_text_new_full (FONT, "Edit", &yellow_color),
"x-align", CLUTTER_BIN_ALIGNMENT_FILL,
"y-align", CLUTTER_BIN_ALIGNMENT_FILL,
NULL);
/* menu */
menu_layout = clutter_box_layout_new ();
clutter_box_layout_set_homogeneous (CLUTTER_BOX_LAYOUT (menu_layout), TRUE);
clutter_box_layout_set_vertical (CLUTTER_BOX_LAYOUT (menu_layout), TRUE);
clutter_box_layout_set_spacing (CLUTTER_BOX_LAYOUT (menu_layout), 2);
menu = clutter_box_new (menu_layout);
clutter_box_set_color (CLUTTER_BOX (menu), &yellow_color);
menu_add_option (CLUTTER_BOX (menu), "Undo", "Ctrl-z");
menu_add_option (CLUTTER_BOX (menu), "Redo", "Ctrl-Shift-z");
menu_add_option (CLUTTER_BOX (menu), "Cut", "Ctrl-x");
menu_add_option (CLUTTER_BOX (menu), "Copy", "Ctrl-c");
menu_add_option (CLUTTER_BOX (menu), "Paste", "Ctrl-v");
/* align left-hand side of menu with left-hand side of button */
clutter_actor_add_constraint (menu, clutter_align_constraint_new (button,
CLUTTER_ALIGN_X_AXIS,
0.0));
/* align top of menu with the bottom of the button */
clutter_actor_add_constraint (menu, clutter_bind_constraint_new (button,
CLUTTER_BIND_Y,
clutter_actor_get_height (button)));
/* hide the menu until we're ready to animate it in */
clutter_actor_set_opacity (menu, 0);
clutter_actor_hide (menu);
/* clicking on the button toggles the menu */
g_signal_connect (button, "button-press-event", G_CALLBACK (menu_toggle), menu);
clutter_container_add_actor (CLUTTER_CONTAINER (stage), menu);
clutter_container_add_actor (CLUTTER_CONTAINER (stage), button);
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}

465
doc/cookbook/examples/layouts-box-property-effects.c Normal file
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@ -0,0 +1,465 @@
/*
* Experiment with permutations of layout properties for a ClutterBoxLayout
*
* See the text (in brackets) at the bottom of the application
* window for available key presses
*/
#include <stdlib.h>
#include <clutter/clutter.h>
#define STAGE_SIDE 510
#define BOX_SIDE STAGE_SIDE * 0.75
#define RED_SIDE STAGE_SIDE / 4
#define GREEN_SIDE STAGE_SIDE / 8
#define BLUE_SIDE STAGE_SIDE / 16
typedef struct
{
ClutterLayoutManager *box_layout;
ClutterActor *box;
ClutterActor *status_display;
gboolean x_fill;
gboolean y_fill;
gboolean expand;
ClutterBoxAlignment x_align;
ClutterBoxAlignment y_align;
} State;
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static const ClutterColor box_color = { 0x66, 0x66, 0x00, 0xff };
static const ClutterColor red_color = { 0xff, 0x00, 0x00, 0xff };
static const ClutterColor green_color = { 0x00, 0xff, 0x00, 0xff };
static const ClutterColor blue_color = { 0x00, 0x00, 0xff, 0xff };
static const ClutterColor white_color = { 0xff, 0xff, 0xff, 0xff };
static GValue
gboolean_to_gvalue (gboolean value)
{
GValue gval = {0};
g_value_init (&gval, G_TYPE_BOOLEAN);
g_value_set_boolean (&gval, value);
return gval;
}
static GValue
alignment_to_gvalue (ClutterBoxAlignment value)
{
GValue gval = {0};
g_value_init (&gval, G_TYPE_INT);
g_value_set_int (&gval, value);
return gval;
}
static gchar*
alignment_as_string (ClutterBoxAlignment value)
{
gchar *align_string = "start ";
switch (value)
{
case CLUTTER_BOX_ALIGNMENT_CENTER:
align_string = "center";
break;
case CLUTTER_BOX_ALIGNMENT_END:
align_string = "end ";
break;
case CLUTTER_BOX_ALIGNMENT_START:
align_string = "start ";
break;
}
return align_string;
}
static ClutterBoxAlignment
get_next_alignment (ClutterBoxAlignment alignment)
{
alignment++;
if (alignment > CLUTTER_BOX_ALIGNMENT_CENTER)
alignment = CLUTTER_BOX_ALIGNMENT_START;
return alignment;
}
static void
show_status (State *state)
{
ClutterText *text = CLUTTER_TEXT (state->status_display);
ClutterBoxLayout *box_layout = CLUTTER_BOX_LAYOUT (state->box_layout);
gboolean homogeneous = clutter_box_layout_get_homogeneous (box_layout);
gboolean vertical = clutter_box_layout_get_vertical (box_layout);
gchar *message = g_strdup_printf ("x_fill (x): %s\t\t\t"
"y_fill (y): %s\n"
"expand (e): %s\t\t"
"homogeneous (h): %s\n"
"spacing (+/-): %dpx\t\t"
"vertical (v): %s\n"
"x_align (right): %s\t"
"y_align (up): %s",
(state->x_fill ? "true" : "false"),
(state->y_fill ? "true" : "false"),
(state->expand ? "true" : "false"),
(homogeneous ? "true" : "false"),
clutter_box_layout_get_spacing (box_layout),
(vertical ? "true" : "false"),
alignment_as_string (state->x_align),
alignment_as_string (state->y_align));
clutter_text_set_text (text, message);
g_free (message);
}
static void
set_property_on_layout_children (State *state,
const gchar *property,
GValue value)
{
ClutterActor *actor;
ClutterContainer *container = CLUTTER_CONTAINER (state->box);
ClutterLayoutManager *manager = CLUTTER_LAYOUT_MANAGER (state->box_layout);
GList *actors = clutter_container_get_children (container);
for (; actors; actors = actors->next)
{
actor = CLUTTER_ACTOR (actors->data);
clutter_layout_manager_child_set_property (manager,
container,
actor,
property,
&value);
}
g_list_free (actors);
}
static void
toggle_x_fill (GObject *instance,
const gchar *action_name,
guint key_val,
ClutterModifierType modifiers,
gpointer user_data)
{
State *state = (State *) user_data;
state->x_fill = !state->x_fill;
set_property_on_layout_children (state,
"x-fill",
gboolean_to_gvalue (state->x_fill));
}
static void
toggle_y_fill (GObject *instance,
const gchar *action_name,
guint key_val,
ClutterModifierType modifiers,
gpointer user_data)
{
State *state = (State *) user_data;
state->y_fill = !state->y_fill;
set_property_on_layout_children (state,
"y-fill",
gboolean_to_gvalue (state->y_fill));
}
static void
toggle_expand (GObject *instance,
const gchar *action_name,
guint key_val,
ClutterModifierType modifiers,
gpointer user_data)
{
State *state = (State *) user_data;
state->expand = !state->expand;
set_property_on_layout_children (state,
"expand",
gboolean_to_gvalue (state->expand));
}
static void
rotate_x_alignment (GObject *instance,
const gchar *action_name,
guint key_val,
ClutterModifierType modifiers,
gpointer user_data)
{
State *state = (State *) user_data;
state->x_align = get_next_alignment (state->x_align);
set_property_on_layout_children (state,
"x-align",
alignment_to_gvalue (state->x_align));
}
static void
rotate_y_alignment (GObject *instance,
const gchar *action_name,
guint key_val,
ClutterModifierType modifiers,
gpointer user_data)
{
State *state = (State *) user_data;
state->y_align = get_next_alignment (state->y_align);
set_property_on_layout_children (state,
"y-align",
alignment_to_gvalue (state->y_align));
}
static void
toggle_vertical (GObject *instance,
const gchar *action_name,
guint key_val,
ClutterModifierType modifiers,
gpointer user_data)
{
State *state = (State *) user_data;
ClutterBoxLayout *box_layout = CLUTTER_BOX_LAYOUT (state->box_layout);
gboolean vertical = clutter_box_layout_get_vertical (box_layout);
clutter_box_layout_set_vertical (box_layout, !vertical);
}
static void
toggle_homogeneous (GObject *instance,
const gchar *action_name,
guint key_val,
ClutterModifierType modifiers,
gpointer user_data)
{
State *state = (State *) user_data;
ClutterBoxLayout *box_layout = CLUTTER_BOX_LAYOUT (state->box_layout);
gboolean homogeneous = clutter_box_layout_get_homogeneous (box_layout);
clutter_box_layout_set_homogeneous (box_layout, !homogeneous);
}
static void
increase_spacing (GObject *instance,
const gchar *action_name,
guint key_val,
ClutterModifierType modifiers,
gpointer user_data)
{
State *state = (State *) user_data;
ClutterBoxLayout *box_layout = CLUTTER_BOX_LAYOUT (state->box_layout);
guint spacing = clutter_box_layout_get_spacing (box_layout) + 5;
clutter_box_layout_set_spacing (box_layout, spacing);
}
static void
decrease_spacing (GObject *instance,
const gchar *action_name,
guint key_val,
ClutterModifierType modifiers,
gpointer user_data)
{
State *state = (State *) user_data;
ClutterBoxLayout *box_layout = CLUTTER_BOX_LAYOUT (state->box_layout);
guint spacing = clutter_box_layout_get_spacing (box_layout);
if (spacing >= 5)
clutter_box_layout_set_spacing (box_layout, spacing - 5);
}
static gboolean
key_pressed_cb (ClutterActor *actor,
ClutterEvent *event,
gpointer user_data)
{
State *state = (State *) user_data;
ClutterBindingPool *pool;
gboolean return_value;
pool = clutter_binding_pool_find (G_OBJECT_TYPE_NAME (actor));
return_value = clutter_binding_pool_activate (pool,
clutter_event_get_key_symbol (event),
clutter_event_get_state (event),
G_OBJECT (actor));
show_status (state);
return return_value;
}
int
main (int argc,
char *argv[])
{
ClutterActor *stage;
GObjectClass *stage_class;
ClutterBindingPool *binding_pool;
ClutterActor *red;
ClutterActor *green;
ClutterActor *blue;
State *state = g_new0 (State, 1);
clutter_init (&argc, &argv);
state->x_fill = FALSE;
state->y_fill = FALSE;
state->expand = FALSE;
state->x_align = CLUTTER_BOX_ALIGNMENT_START;
stage = clutter_stage_get_default ();
clutter_actor_set_size (stage, STAGE_SIDE, STAGE_SIDE);
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
/* for key bindings */
stage_class = G_OBJECT_GET_CLASS (stage);
binding_pool = clutter_binding_pool_get_for_class (stage_class);
clutter_binding_pool_install_action (binding_pool,
"toggle-expand",
CLUTTER_KEY_e,
0,
G_CALLBACK (toggle_expand),
state,
NULL);
clutter_binding_pool_install_action (binding_pool,
"toggle-x-fill",
CLUTTER_KEY_x,
0,
G_CALLBACK (toggle_x_fill),
state,
NULL);
clutter_binding_pool_install_action (binding_pool,
"toggle-y-fill",
CLUTTER_KEY_y,
0,
G_CALLBACK (toggle_y_fill),
state,
NULL);
clutter_binding_pool_install_action (binding_pool,
"toggle-vertical",
CLUTTER_KEY_v,
0,
G_CALLBACK (toggle_vertical),
state,
NULL);
clutter_binding_pool_install_action (binding_pool,
"toggle-homogeneous",
CLUTTER_KEY_h,
0,
G_CALLBACK (toggle_homogeneous),
state,
NULL);
clutter_binding_pool_install_action (binding_pool,
"rotate-x-alignment",
CLUTTER_KEY_Right,
0,
G_CALLBACK (rotate_x_alignment),
state,
NULL);
clutter_binding_pool_install_action (binding_pool,
"rotate-y-alignment",
CLUTTER_KEY_Up,
0,
G_CALLBACK (rotate_y_alignment),
state,
NULL);
clutter_binding_pool_install_action (binding_pool,
"increase-spacing",
CLUTTER_KEY_plus,
CLUTTER_SHIFT_MASK,
G_CALLBACK (increase_spacing),
state,
NULL);
clutter_binding_pool_install_action (binding_pool,
"decrease-spacing",
CLUTTER_KEY_minus,
0,
G_CALLBACK (decrease_spacing),
state,
NULL);
/* rectangles inside the layout */
red = clutter_rectangle_new_with_color (&red_color);
clutter_actor_set_size (red, RED_SIDE, RED_SIDE);
green = clutter_rectangle_new_with_color (&green_color);
clutter_actor_set_size (green, GREEN_SIDE, GREEN_SIDE);
blue = clutter_rectangle_new_with_color (&blue_color);
clutter_actor_set_size (blue, BLUE_SIDE, BLUE_SIDE);
/* the layout */
state->box_layout = clutter_box_layout_new ();
clutter_box_layout_set_use_animations (CLUTTER_BOX_LAYOUT (state->box_layout),
TRUE);
state->box = clutter_box_new (state->box_layout);
clutter_box_set_color (CLUTTER_BOX (state->box), &box_color);
clutter_actor_set_size (state->box, BOX_SIDE, BOX_SIDE);
clutter_actor_add_constraint (state->box,
clutter_align_constraint_new (stage, CLUTTER_ALIGN_X_AXIS, 0.5));
clutter_actor_add_constraint (state->box,
clutter_align_constraint_new (stage, CLUTTER_ALIGN_Y_AXIS, 0.1));
/* text to show status */
state->status_display = clutter_text_new ();
clutter_text_set_color (CLUTTER_TEXT (state->status_display), &white_color);
clutter_actor_set_size (state->status_display,
STAGE_SIDE,
STAGE_SIDE * 0.2);
clutter_actor_set_position (state->status_display,
(STAGE_SIDE - BOX_SIDE) / 2,
STAGE_SIDE * 0.8);
/* set text for initial state */
show_status (state);
/* connect key presses to a callback on the binding pool */
g_signal_connect (stage,
"key-press-event",
G_CALLBACK (key_pressed_cb),
state);
/* pack UI */
clutter_container_add (CLUTTER_CONTAINER (state->box), red, green, blue, NULL);
clutter_container_add (CLUTTER_CONTAINER (stage),
state->box,
state->status_display,
NULL);
/* show stage */
clutter_actor_show (stage);
clutter_main ();
/* clean up */
g_object_unref (binding_pool);
g_free (state);
return EXIT_SUCCESS;
}

95
doc/cookbook/examples/layouts-box.c Normal file
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@ -0,0 +1,95 @@
#include <stdlib.h>
#include <clutter/clutter.h>
static const ClutterColor stage_color = { 0x33, 0x33, 0x55, 0xff };
static const ClutterColor box_color = { 0xff, 0xff, 0xff, 0xff };
static const ClutterColor yellow_color = { 0xaa, 0xaa, 0x00, 0xff };
static const ClutterColor red_color = { 0xff, 0x00, 0x00, 0xff };
static const ClutterColor blue_color = { 0x00, 0x00, 0xff, 0xff };
int
main (int argc,
char *argv[])
{
ClutterActor *stage;
ClutterLayoutManager *box_layout;
ClutterActor *box;
ClutterActor *yellow;
ClutterActor *red;
ClutterActor *blue;
clutter_init (&argc, &argv);
stage = clutter_stage_get_default ();
clutter_actor_set_size (stage, 400, 400);
clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);
g_signal_connect (stage, "destroy", G_CALLBACK (clutter_main_quit), NULL);
/* create a ClutterBoxLayout */
box_layout = clutter_box_layout_new ();
/* configure it to lay out actors vertically */
clutter_box_layout_set_vertical (CLUTTER_BOX_LAYOUT (box_layout), TRUE);
/* put 5px of spacing between actors */
clutter_box_layout_set_spacing (CLUTTER_BOX_LAYOUT (box_layout), 5);
/* actors are packed into this box; we set its width, but
* allow its height to be determined by the children it contains
*/
box = clutter_box_new (box_layout);
clutter_box_set_color (CLUTTER_BOX (box), &box_color);
clutter_actor_set_position (box, 100, 50);
clutter_actor_set_width (box, 200);
/* pack an actor into the layout and set all layout properties on it
* at the same time
*/
yellow = clutter_rectangle_new_with_color (&yellow_color);
clutter_actor_set_size (yellow, 100, 100);
clutter_box_layout_pack (CLUTTER_BOX_LAYOUT (box_layout),
yellow,
FALSE, /* expand */
TRUE, /* x-fill */
FALSE, /* y-fill */
CLUTTER_BOX_ALIGNMENT_START, /* x-align */
CLUTTER_BOX_ALIGNMENT_START); /* y-align */
/* pack an actor into the box and set layout properties at the
* same time; note this is more concise if you mostly want to
* use the default properties for the layout
*/
red = clutter_rectangle_new_with_color (&red_color);
clutter_actor_set_size (red, 100, 100);
clutter_box_pack (CLUTTER_BOX (box),
red,
"x-fill", TRUE,
NULL);
/* add an actor to the box as a container and set layout properties
* afterwards; the latter is useful if you want to change properties on
* actors already inside a layout, but note that you have to
* pass the function both the layout AND the container
*/
blue = clutter_rectangle_new_with_color (&blue_color);
clutter_actor_set_size (blue, 100, 100);
clutter_container_add_actor (CLUTTER_CONTAINER (box), blue);
clutter_layout_manager_child_set (box_layout,
CLUTTER_CONTAINER (box),
blue,
"x-fill", TRUE,
NULL);
/* put the box on the stage */
clutter_container_add_actor (CLUTTER_CONTAINER (stage), box);
clutter_actor_show (stage);
clutter_main ();
return EXIT_SUCCESS;
}

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134
doc/cookbook/layouts.xml
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@ -839,11 +839,96 @@ clutter_actor_raise_top (text);
column of <type>ClutterActors</type>, and has configurable spacing,
actor alignments, and expand and fill options.</para>
<para>The code fragment below is excerpted from the
<link linkend="layouts-box-example-1">full example</link>. It
demonstrates how to lay out three rectangles in a vertical
column. A different approach is used to set the <varname>x-fill</varname>
property on each rectangle, so that they fill the horizontal space in
the layout (each rectangle is 100 pixels wide, while the
box they are inside is 200 pixels wide).</para>
<informalexample>
<programlisting>
???
<![CDATA[
/* create a ClutterBoxLayout */
box_layout = clutter_box_layout_new ();
/* configure it to lay out actors vertically */
clutter_box_layout_set_vertical (CLUTTER_BOX_LAYOUT (box_layout), TRUE);
/* put 5px of spacing between actors */
clutter_box_layout_set_spacing (CLUTTER_BOX_LAYOUT (box_layout), 5);
/* actors are packed into this box; we set its width, but
* allow its height to be determined by the children it contains
*/
box = clutter_box_new (box_layout);
clutter_box_set_color (CLUTTER_BOX (box), &box_color);
clutter_actor_set_position (box, 100, 50);
clutter_actor_set_width (box, 200);
/* pack an actor into the layout and set all layout properties on it
* at the same time
*/
yellow = clutter_rectangle_new_with_color (&yellow_color);
clutter_actor_set_size (yellow, 100, 100);
clutter_box_layout_pack (CLUTTER_BOX_LAYOUT (box_layout),
yellow,
FALSE, /* expand */
TRUE, /* x-fill */
FALSE, /* y-fill */
CLUTTER_BOX_ALIGNMENT_START, /* x-align */
CLUTTER_BOX_ALIGNMENT_START); /* y-align */
/* pack an actor into the box and set layout properties at the
* same time; note this is more concise if you mostly want to
* use the default properties for the layout
*/
red = clutter_rectangle_new_with_color (&red_color);
clutter_actor_set_size (red, 100, 100);
clutter_box_pack (CLUTTER_BOX (box),
red,
"x-fill", TRUE,
NULL);
/* add an actor to the box as a container and set layout properties
* afterwards; the latter is useful if you want to change properties on
* actors already inside a layout, but note that you have to
* pass the function both the layout AND the container
*/
blue = clutter_rectangle_new_with_color (&blue_color);
clutter_actor_set_size (blue, 100, 100);
clutter_container_add_actor (CLUTTER_CONTAINER (box), blue);
clutter_layout_manager_child_set (box_layout,
CLUTTER_CONTAINER (box),
blue,
"x-fill", TRUE,
NULL);
/* put the box on the stage */
clutter_container_add_actor (CLUTTER_CONTAINER (stage), box);
]]>
</programlisting>
</informalexample>
<para>The result looks like this:</para>
<screenshot>
<mediaobject>
<imageobject>
<imagedata format="PNG"
fileref="images/layouts-box.png" />
</imageobject>
<alt>
<para>A simple vertical <type>ClutterBoxLayout</type></para>
</alt>
</mediaobject>
</screenshot>
</section>
<section>
@ -877,7 +962,8 @@ clutter_actor_raise_top (text);
<para>The main issue you may face when applying these properties
is understanding how they interact. As this is harder to describe
than to show, you can run the <link linkend="???">second example</link>
than to show, you can run the
<link linkend="layouts-box-example-3">third example</link>
below to toggle and tweak the various properties.</para>
<note>
@ -896,7 +982,8 @@ clutter_actor_raise_top (text);
<note>
<para>Animation properties are covered separately
<link linkend="???">later</link>.</para>
<link linkend="layouts-box-animating-layout-changes">later</link>.
</para>
</note>
<itemizedlist>
@ -981,6 +1068,10 @@ clutter_actor_raise_top (text);
or vertical space (respectively) within the layout. Setting
these properties only has an effect where an actor is smaller
(on the fill axis or axes) than the layout's container.</para>
<para>Note that the actor's size is not actually changed
if it is set to fill: the reported width and height are
not affected.</para>
</listitem>
<listitem>
@ -1023,15 +1114,15 @@ clutter_actor_raise_top (text);
</section>
<section>
<title>Animating changes to the layout</title>
<section id="layouts-box-animating-layout-changes">
<title>Animating layout changes</title>
<para>If actors are added to a layout, or if the layout's
properties or its children's properties are changed, the
appearance of the layout may also change. The
<varname>use-animations</varname> property (set with
<function>clutter_box_layout_set_use_animations()</function>)
sets whether such changes to the layout are animated: if set
determines whether such changes to the layout are animated: if set
to <constant>TRUE</constant>, any changes to actor
allocations resulting from the changes (movements, resizings)
are animated.</para>
@ -1051,21 +1142,44 @@ clutter_actor_raise_top (text);
introduction</link> for more about easing and duration
properties).</para>
<para>The <link linkend="layouts-box-example-3">third example</link>
uses animation for layout changes, and can give you some idea
of what to expect in your own animated layouts.</para>
</section>
</section>
<section>
<title>Full examples</title>
<!--example id="layouts-box-example-1">
<title>Creating an automatically-resizing overlay for a
texture using <type>ClutterBindConstraint</type></title>
<example id="layouts-box-example-1">
<title>Different approaches to setting child layout properties
in a <type>ClutterBoxLayout</type></title>
<programlisting>
<xi:include href="examples/layouts-box.c" parse="text">
<xi:fallback>a code sample should be here... but isn't</xi:fallback>
</xi:include>
</programlisting>
</example-->
</example>
<example id="layouts-box-example-2">
<title>A simple <type>ClutterBoxLayout</type> menu</title>
<programlisting>
<xi:include href="examples/layouts-box-menu.c" parse="text">
<xi:fallback>a code sample should be here... but isn't</xi:fallback>
</xi:include>
</programlisting>
</example>
<example id="layouts-box-example-3">
<title>A demonstrator for some of <type>ClutterBoxLayout's</type>
properties</title>
<programlisting>
<xi:include href="examples/layouts-box-property-effects.c" parse="text">
<xi:fallback>a code sample should be here... but isn't</xi:fallback>
</xi:include>
</programlisting>
</example>
</section>