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gtk-demo: Fix hotspot handling in dnd

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We were not remembering the pointer coordinates.
This commit is contained in:
Matthias Clasen
2023-02-13 18:38:27 -05:00
parent cd0fe13dae
commit e6dfb8732a
1 changed files with 12 additions and 1 deletions
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13
demos/gtk-demo/dnd.c
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@@ -356,6 +356,10 @@ canvas_item_start_editing (CanvasItem *item)
}
typedef struct {
double x, y;
} Hotspot;
static GdkContentProvider *
prepare (GtkDragSource *source,
double x,
@@ -363,6 +367,7 @@ prepare (GtkDragSource *source,
{
GtkWidget *canvas;
GtkWidget *item;
Hotspot *hotspot;
canvas = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
item = gtk_widget_pick (canvas, x, y, GTK_PICK_DEFAULT);
@@ -373,6 +378,10 @@ prepare (GtkDragSource *source,
g_object_set_data (G_OBJECT (canvas), "dragged-item", item);
hotspot = g_new (Hotspot, 1);
gtk_widget_translate_coordinates (canvas, item, x, y, &hotspot->x, &hotspot->y);
g_object_set_data_full (G_OBJECT (canvas), "hotspot", hotspot, g_free);
return gdk_content_provider_new_typed (GTK_TYPE_WIDGET, item);
}
@@ -383,12 +392,14 @@ drag_begin (GtkDragSource *source,
GtkWidget *canvas;
CanvasItem *item;
GdkPaintable *paintable;
Hotspot *hotspot;
canvas = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
item = CANVAS_ITEM (g_object_get_data (G_OBJECT (canvas), "dragged-item"));
hotspot = (Hotspot *) g_object_get_data (G_OBJECT (canvas), "hotspot");
paintable = canvas_item_get_drag_icon (item);
gtk_drag_source_set_icon (source, paintable, item->r, item->r);
gtk_drag_source_set_icon (source, paintable, hotspot->x, hotspot->y);
g_object_unref (paintable);
gtk_widget_set_opacity (GTK_WIDGET (item), 0.3);