[ShellSlicer] New class to display center of child
A #StBin that has 0 minimum size, and will clip its child in the middle. https://bugzilla.gnome.org/show_bug.cgi?id=605491
This commit is contained in:
Colin Walters
parent
da797dff35
commit
262f92e0be
@ -85,6 +85,8 @@ libgnome_shell_la_SOURCES = \
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shell-global.c \
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shell-global.h \
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shell-global-private.h \
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shell-slicer.c \
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shell-slicer.h \
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shell-stack.c \
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shell-stack.h \
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shell-tray-manager.c \
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162
src/shell-slicer.c
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162
src/shell-slicer.c
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@ -0,0 +1,162 @@
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/**
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* SECTION:shell-slicer
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* @short_description: Display only part of another actor
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*
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* A #StBin that has 0 minimum size, and will clip its child
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* in the middle.
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*/
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#include "config.h"
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#include "shell-slicer.h"
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G_DEFINE_TYPE (ShellSlicer,
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shell_slicer,
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ST_TYPE_BIN);
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static void
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shell_slicer_get_preferred_width (ClutterActor *self,
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gfloat for_height,
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gfloat *min_width_p,
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gfloat *natural_width_p)
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{
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ClutterActor *child = st_bin_get_child (ST_BIN (self));
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StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (self));
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st_theme_node_adjust_for_height (theme_node, &for_height);
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if (min_width_p)
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*min_width_p = 0;
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if (child == NULL)
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{
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if (natural_width_p)
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*natural_width_p = 0;
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}
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else
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{
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clutter_actor_get_preferred_width (child, for_height,
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NULL,
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natural_width_p);
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}
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st_theme_node_adjust_preferred_width (theme_node, min_width_p, natural_width_p);
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}
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static void
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shell_slicer_get_preferred_height (ClutterActor *self,
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gfloat for_width,
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gfloat *min_height_p,
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gfloat *natural_height_p)
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{
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ClutterActor *child = st_bin_get_child (ST_BIN (self));
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StThemeNode *theme_node = st_widget_get_theme_node (ST_WIDGET (self));
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st_theme_node_adjust_for_width (theme_node, &for_width);
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if (min_height_p)
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*min_height_p = 0;
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if (child == NULL)
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{
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if (natural_height_p)
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*natural_height_p = 0;
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}
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else
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{
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clutter_actor_get_preferred_height (child, for_width,
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NULL,
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natural_height_p);
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}
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st_theme_node_adjust_preferred_height (theme_node, min_height_p, natural_height_p);
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}
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static void
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shell_slicer_allocate (ClutterActor *self,
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const ClutterActorBox *box,
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ClutterAllocationFlags flags)
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{
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ClutterActor *child;
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/* Chain up directly to ClutterActor to set actor->allocation. We explicitly skip our parent class
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* StBin here because we want to override the allocate function. */
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CLUTTER_ACTOR_CLASS (g_type_class_peek (clutter_actor_get_type ()))->allocate (self, box, flags);
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child = st_bin_get_child (ST_BIN (self));
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if (child)
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clutter_actor_allocate_preferred_size (child, flags);
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}
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static void
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shell_slicer_paint_child (ShellSlicer *self)
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{
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ClutterActor *child;
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ClutterActorBox self_box;
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ClutterActorBox child_box;
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float width, height, child_width, child_height;
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double x_align, y_align;
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child = st_bin_get_child (ST_BIN (self));
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if (!child)
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return;
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_st_bin_get_align_factors (ST_BIN (self), &x_align, &y_align);
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clutter_actor_get_allocation_box (CLUTTER_ACTOR (self), &self_box);
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clutter_actor_get_allocation_box (child, &child_box);
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width = self_box.x2 - self_box.x1;
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height = self_box.y2 - self_box.y1;
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child_width = child_box.x2 - child_box.x1;
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child_height = child_box.y2 - child_box.y1;
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cogl_push_matrix ();
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cogl_clip_push (0, 0, width, height);
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cogl_translate ((int)(0.5 + x_align * (width - child_width)),
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(int)(0.5 + y_align * (height - child_height)),
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0);
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clutter_actor_paint (child);
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cogl_clip_pop ();
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cogl_pop_matrix ();
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}
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static void
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shell_slicer_paint (ClutterActor *self)
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{
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/* StWidget paints CSS elements */
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CLUTTER_ACTOR_CLASS (g_type_class_peek (st_widget_get_type ()))->paint (self);
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shell_slicer_paint_child (SHELL_SLICER (self));
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}
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static void
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shell_slicer_pick (ClutterActor *self,
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const ClutterColor *pick_color)
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{
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shell_slicer_paint_child (SHELL_SLICER (self));
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}
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static void
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shell_slicer_class_init (ShellSlicerClass *klass)
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{
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ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
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actor_class->get_preferred_width = shell_slicer_get_preferred_width;
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actor_class->get_preferred_height = shell_slicer_get_preferred_height;
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actor_class->allocate = shell_slicer_allocate;
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actor_class->paint = shell_slicer_paint;
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actor_class->pick = shell_slicer_pick;
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}
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static void
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shell_slicer_init (ShellSlicer *actor)
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{
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}
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33
src/shell-slicer.h
Normal file
33
src/shell-slicer.h
Normal file
@ -0,0 +1,33 @@
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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#ifndef __SHELL_SLICER_H__
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#define __SHELL_SLICER_H__
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#include "st/st.h"
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#define SHELL_TYPE_SLICER (shell_slicer_get_type ())
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#define SHELL_SLICER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), SHELL_TYPE_SLICER, ShellSlicer))
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#define SHELL_SLICER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), SHELL_TYPE_SLICER, ShellSlicerClass))
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#define SHELL_IS_SLICER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), SHELL_TYPE_SLICER))
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#define SHELL_IS_SLICER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), SHELL_TYPE_SLICER))
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#define SHELL_SLICER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), SHELL_TYPE_SLICER, ShellSlicerClass))
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typedef struct _ShellSlicer ShellSlicer;
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typedef struct _ShellSlicerClass ShellSlicerClass;
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typedef struct _ShellSlicerPrivate ShellSlicerPrivate;
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struct _ShellSlicer
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{
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StBin parent;
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ShellSlicerPrivate *priv;
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};
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struct _ShellSlicerClass
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{
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StBinClass parent_class;
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};
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GType shell_slicer_get_type (void) G_GNUC_CONST;
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#endif /* __SHELL_SLICER_H__ */
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