GtkWidget::drag_source_set
Sets the calling widgets as a drag-and-drop source, so that
data can be dragged from the widget to a drop target.
Example 58. Using drag_source_set()
$targets = array( array( 'text/uri-list', 0, 0));
$list->drag_source_set(GDK_BUTTON1_MASK|GDK_BUTTON3_MASK, $targets, GDK_ACTION_COPY);
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The first parameter, start_button_mask, is a bitmask
with all mouse buttons allowed to start the drag.
The targets is an array of data types provided
as drag/drop data. See drag_dest_set()
for a detailed explanation of this topic.
actions determine which actions will take place
if the drop event occurs; a copy/move/delete. See
GdkDragAction for all possible options.
