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GObject
╰── GInitiallyUnowned
╰── GtkWidget
╰── GtkContainer
╰── GtkBin
╰── GtkWindow
╰── GdlPreviewWindow
The GdlPreviewWindow is used to indicate the position where the widget will be dropped. Depending on the capability of the screen it can use a transparent window or just a border.
void gdl_preview_window_update (GdlPreviewWindow *window,GdkRectangle *rect);
Update the size and position of the preview window. This function is called on drag_motion event to update the representation of the docking site in real time.