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Libgnomedb 4.0 Reference Manual | ![]() |
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GnomeDbCanvasItemGnomeDbCanvasItem — Base class for all the GnomeCanvasItem derived widgets in libgnomedb. |
GnomeDbCanvasItem; GnomeDbCanvasItemClass; GnomeDbCanvas* gnome_db_canvas_item_get_canvas (GnomeDbCanvasItem *item); GnomeDbGraphItem* gnome_db_canvas_item_get_graph_item (GnomeDbCanvasItem *item); void gnome_db_canvas_item_get_edge_nodes (GnomeDbCanvasItem *item, GnomeDbCanvasItem **from, GnomeDbCanvasItem **to);
GObject +----GooCanvasItemSimple +----GooCanvasGroup +----GnomeDbCanvasItem +----GnomeDbCanvasText +----GnomeDbCanvasCursor +----GnomeDbCanvasFkey +----GnomeDbCanvasTable
"allow-drag" gboolean : Read / Write "allow-move" gboolean : Read / Write "graph-item" GnomeDbGraphItem* : Read / Write "tip-text" gchar* : Read / Write
"destroy" : Run First "drag-action" : Run First "moved" : Run First "moving" : Run First "shifted" : Run First
This object adds some functionnalities on top of the GnomeCanvasItem objects such as synchronisation with a GdaGraphItem object (to have a persistent position on the canvas), the ability to be moved on the canvas, and the ability to initiate and report simple drag and drop within the canvas.
typedef struct { GooCanvasGroupClass parent_class; /* signals */ void (*moved) (GnomeDbCanvasItem *citem); void (*moving) (GnomeDbCanvasItem *citem); void (*shifted) (GnomeDbCanvasItem *citem); void (*drag_action) (GnomeDbCanvasItem *citem, GnomeDbCanvasItem * dragged_from, GnomeDbCanvasItem * dragged_to); void (*destroy) (GnomeDbCanvasItem *citem); /* virtual functions */ void (*extra_event) (GnomeDbCanvasItem *citem, GdkEventType event_type); void (*get_edge_nodes)(GnomeDbCanvasItem *citem, GnomeDbCanvasItem **from, GnomeDbCanvasItem **to); } GnomeDbCanvasItemClass;
GnomeDbCanvas* gnome_db_canvas_item_get_canvas (GnomeDbCanvasItem *item);
Get the GnomeDbCanvas on which item
is drawn
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a GnomeDbCanvasItem object |
Returns : |
the GnomeDbCanvas widget |
GnomeDbGraphItem* gnome_db_canvas_item_get_graph_item (GnomeDbCanvasItem *item);
Get the associated GnomeDbGraphItem to item
.
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a GnomeDbCanvasItem object |
Returns : |
the GnomeDbGraphItem, or NULL
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void gnome_db_canvas_item_get_edge_nodes (GnomeDbCanvasItem *item, GnomeDbCanvasItem **from, GnomeDbCanvasItem **to);
If the item
canvas item represents a "link" between two other canvas items (an edge), then
set from
and to
to those items.
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a GnomeDbCanvasItem object |
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a place to store the FROM part of the edge, or NULL
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a place to store the TO part of the edge, or NULL
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"destroy"
signalvoid user_function (GnomeDbCanvasItem *dbcanvasitem, gpointer user_data) : Run First
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the object which received the signal. |
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user data set when the signal handler was connected. |
"drag-action"
signalvoid user_function (GnomeDbCanvasItem *dbcanvasitem, gpointer arg1, gpointer arg2, gpointer user_data) : Run First
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the object which received the signal. |
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user data set when the signal handler was connected. |
"moved"
signalvoid user_function (GnomeDbCanvasItem *dbcanvasitem, gpointer user_data) : Run First
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the object which received the signal. |
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user data set when the signal handler was connected. |
"moving"
signalvoid user_function (GnomeDbCanvasItem *dbcanvasitem, gpointer user_data) : Run First
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the object which received the signal. |
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user data set when the signal handler was connected. |
"shifted"
signalvoid user_function (GnomeDbCanvasItem *dbcanvasitem, gpointer user_data) : Run First
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the object which received the signal. |
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user data set when the signal handler was connected. |