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DiaCanvas2 Reference Manual | ![]() |
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DiaHandleLayerDiaHandleLayer — Special class used by DiaCanvasView to visualize handles. |
#define DIA_HANDLE_LAYER (obj) DiaHandleLayer; void dia_handle_layer_update_handles (DiaHandleLayer *layer, DiaCanvasViewItem *item); void dia_handle_layer_get_pos_c (DiaHandleLayer *layer, DiaHandle *handle, gint *x, gint *y); void dia_handle_layer_request_redraw (DiaHandleLayer *layer, gint x, gint y); void dia_handle_layer_request_redraw_handle (DiaHandleLayer *layer, DiaHandle *handle); void dia_handle_layer_grab_handle (DiaHandleLayer *layer, DiaHandle *handle);
GObject +----GInitiallyUnowned +----GtkObject +----GnomeCanvasItem +----DiaHandleLayer
Since handles are always displayed on top of the objects, a handle layer is drawn on top of the canvas items.
#define DIA_HANDLE_LAYER(obj) (GTK_CHECK_CAST ((obj), DIA_TYPE_HANDLE_LAYER, DiaHandleLayer))
obj : |
void dia_handle_layer_update_handles (DiaHandleLayer *layer, DiaCanvasViewItem *item);
Redraw handles if nessesary. The old handle positions are stored in the DiaCanvasViewItem to ensure proper redrawing.
layer : |
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item : |
void dia_handle_layer_get_pos_c (DiaHandleLayer *layer, DiaHandle *handle, gint *x, gint *y);
Given a handle, return the position of that handle in canvas coordinates.
layer : |
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handle : |
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x : |
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y : |
void dia_handle_layer_request_redraw (DiaHandleLayer *layer, gint x, gint y);
Ask the canvas to do a redraw of the a handle. Only the handles x
and y
position need to be given (in canvas coordinates).
layer : |
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x : |
Position of the handle, in canvas coordinates |
y : |
void dia_handle_layer_request_redraw_handle (DiaHandleLayer *layer, DiaHandle *handle);
Do a redraw for handle
.
layer : |
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handle : |
void dia_handle_layer_grab_handle (DiaHandleLayer *layer, DiaHandle *handle);
DEPRICATED
Grab a handle. The handle should be grabbed suring a button-press event, since the handle-layer will grab the widgets events.
layer : |
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handle : |