a15ee28177
ShellDrawingArea is a size-independent wrapper for a ClutterCairoTexture. Useful when drawing non-fixed size areas. ShellStack is a simple container class which holds items in a completely overlapping Z stack. The main difference from ClutterGroup is that items will be constrained to (and allocated) the size of the stack, not getting their preferred size always.
93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/**
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* SECTION:shell-drawing-area
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* @short_description: A dynamically-sized Cairo drawing area
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*
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* #ShellDrawingArea is similar to #ClutterCairoTexture in that
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* it allows drawing via Cairo; the primary difference is that
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* it is dynamically sized. To use, connect to the @redraw
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* signal, and inside the signal handler, call
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* clutter_cairo_texture_create() to begin drawing.
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*/
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#include "shell-drawing-area.h"
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#include <clutter/clutter.h>
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#include <gtk/gtk.h>
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#include <cairo.h>
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G_DEFINE_TYPE(ShellDrawingArea, shell_drawing_area, CLUTTER_TYPE_GROUP);
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struct _ShellDrawingAreaPrivate {
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ClutterCairoTexture *texture;
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};
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/* Signals */
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enum
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{
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REDRAW,
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LAST_SIGNAL
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};
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static guint shell_drawing_area_signals [LAST_SIGNAL] = { 0 };
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static void
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shell_drawing_area_allocate (ClutterActor *self,
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const ClutterActorBox *box,
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ClutterAllocationFlags flags)
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{
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ShellDrawingArea *area = SHELL_DRAWING_AREA (self);
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int width = box->x2 - box->x1;
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int height = box->y2 - box->y1;
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clutter_actor_allocate (CLUTTER_ACTOR (area->priv->texture), box, flags);
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if (width > 0 && height > 0)
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{
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clutter_cairo_texture_set_surface_size (area->priv->texture,
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width, height);
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g_signal_emit (G_OBJECT (self), shell_drawing_area_signals[REDRAW], 0,
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area->priv->texture);
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}
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}
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static void
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shell_drawing_area_class_init (ShellDrawingAreaClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
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actor_class->allocate = shell_drawing_area_allocate;
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shell_drawing_area_signals[REDRAW] =
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g_signal_new ("redraw",
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (ShellDrawingAreaClass, redraw),
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NULL, NULL,
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g_cclosure_marshal_VOID__OBJECT,
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G_TYPE_NONE, 1, G_TYPE_OBJECT);
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g_type_class_add_private (gobject_class, sizeof (ShellDrawingAreaPrivate));
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}
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static void
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shell_drawing_area_init (ShellDrawingArea *area)
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{
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area->priv = G_TYPE_INSTANCE_GET_PRIVATE (area, SHELL_TYPE_DRAWING_AREA,
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ShellDrawingAreaPrivate);
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area->priv->texture = CLUTTER_CAIRO_TEXTURE (clutter_cairo_texture_new (1, 1));
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clutter_container_add_actor (CLUTTER_CONTAINER (area), CLUTTER_ACTOR (area->priv->texture));
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}
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/**
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* shell_drawing_area_get_texture:
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*
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* Return Value: (transfer none):
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*/
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ClutterCairoTexture *
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shell_drawing_area_get_texture (ShellDrawingArea *area)
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{
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return area->priv->texture;
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}
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