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Viewing changes to src/st/st-drawing-area.c

  • Committer: Bazaar Package Importer
  • Author(s): Gustavo Noronha Silva
  • Date: 2009-11-25 19:06:40 UTC
  • mfrom: (1.1.11 upstream)
  • Revision ID: james.westby@ubuntu.com-20091125190640-cl36tq1pgy3gkws5
Tags: 2.28.1~git20091125-1
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src/st/st-drawing-area.c
 
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
 
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/**
 
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 * SECTION:st-drawing-area
 
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 * @short_description: A dynamically-sized Cairo drawing area
 
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 *
 
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 * #StDrawingArea 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 #StDrawingArea::redraw
 
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 * signal, and inside the signal handler, call
 
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 * clutter_cairo_texture_create() to begin drawing.  The
 
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 * #StDrawingArea::redraw signal will be emitted by default when the area is
 
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 * resized or the CSS style changes; you can use the
 
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 * st_drawing_area_emit_redraw() as well.
 
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 */
 
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#include "st-drawing-area.h"
 
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#include <cairo.h>
 
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G_DEFINE_TYPE(StDrawingArea, st_drawing_area, ST_TYPE_BIN);
 
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struct _StDrawingAreaPrivate {
 
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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 st_drawing_area_signals [LAST_SIGNAL] = { 0 };
 
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static void
 
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st_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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  StThemeNode *theme_node;
 
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  ClutterActorBox content_box;
 
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  StDrawingArea *area = ST_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_CLASS (st_drawing_area_parent_class))->allocate (self, box, flags);
 
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  theme_node = st_widget_get_theme_node (ST_WIDGET (self));
 
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  st_theme_node_get_content_box (theme_node, box, &content_box);
 
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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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                                              content_box.x2 - content_box.x1,
 
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                                              content_box.y2 - content_box.y1);
 
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      g_signal_emit (G_OBJECT (self), st_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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st_drawing_area_style_changed (StWidget  *self)
 
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{
 
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  (ST_WIDGET_CLASS (st_drawing_area_parent_class))->style_changed (self);
 
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  st_drawing_area_emit_redraw (ST_DRAWING_AREA (self));
 
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}
 
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static void
 
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st_drawing_area_class_init (StDrawingAreaClass *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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  StWidgetClass *widget_class = ST_WIDGET_CLASS (klass);
 
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  actor_class->allocate = st_drawing_area_allocate;
 
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  widget_class->style_changed = st_drawing_area_style_changed;
 
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  st_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 (StDrawingAreaClass, redraw),
 
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                  NULL, NULL,
 
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                  g_cclosure_marshal_VOID__OBJECT,
 
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                  G_TYPE_NONE, 1, CLUTTER_TYPE_CAIRO_TEXTURE);
 
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  g_type_class_add_private (gobject_class, sizeof (StDrawingAreaPrivate));
 
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}
 
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static void
 
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st_drawing_area_init (StDrawingArea *area)
 
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{
 
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  area->priv = G_TYPE_INSTANCE_GET_PRIVATE (area, ST_TYPE_DRAWING_AREA,
 
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                                            StDrawingAreaPrivate);
 
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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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 * st_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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st_drawing_area_get_texture (StDrawingArea *area)
 
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{
 
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  return area->priv->texture;
 
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}
 
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/**
 
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 * st_drawing_area_emit_redraw:
 
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 * @area: A #StDrawingArea
 
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 *
 
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 * Immediately emit a redraw signal.  Useful if
 
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 * some parameters for the area being drawn other
 
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 * than the size or style have changed.
 
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 */
 
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void
 
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st_drawing_area_emit_redraw (StDrawingArea *area)
 
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{
 
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  g_signal_emit ((GObject*)area, st_drawing_area_signals[REDRAW], 0, area->priv->texture);
 
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}