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Functions
| void | st_drawing_area_queue_repaint () |
| cairo_t * | st_drawing_area_get_context () |
| void | st_drawing_area_get_surface_size () |
Implemented Interfaces
StDrawingArea implements ClutterContainer, ClutterScriptable, ClutterAnimatable and AtkImplementorIface.
Description
StDrawingArea is similar to ClutterCairoTexture in that
it allows drawing via Cairo; the primary difference is that
it is dynamically sized. To use, connect to the “repaint”
signal, and inside the signal handler, call
st_drawing_area_get_context() to get the Cairo context to draw to. The
“repaint” signal will be emitted by default when the area is
resized or the CSS style changes; you can use the
st_drawing_area_queue_repaint() as well.
Functions
st_drawing_area_queue_repaint ()
void
st_drawing_area_queue_repaint (StDrawingArea *area);
Will cause the actor to emit a ::repaint signal before it is next
drawn to the scene. Useful if some parameters for the area being
drawn other than the size or style have changed. Note that
clutter_actor_queue_redraw() will simply result in the same
contents being drawn to the scene again.
st_drawing_area_get_context ()
cairo_t *
st_drawing_area_get_context (StDrawingArea *area);
Gets the Cairo context to paint to. This function must only be called from a signal hander for the ::repaint signal.
st_drawing_area_get_surface_size ()
void st_drawing_area_get_surface_size (StDrawingArea *area,guint *width,guint *height);
Gets the size of the cairo surface being painted to, which is equal to the size of the content area of the widget. This function must only be called from a signal hander for the ::repaint signal.
Parameters
area |
the StDrawingArea |
|
width |
location to store the width of the painted area. |
[out] |
height |
location to store the height of the painted area. |
[out] |
Types and Values
struct StDrawingAreaClass
struct StDrawingAreaClass {
StWidgetClass parent_class;
void (*repaint) (StDrawingArea *area);
};
Signal Details
The “repaint” signal
void user_function (StDrawingArea *stdrawingarea, gpointer user_data)
Flags: Run Last