void
nautilus_drag_autoscroll_start (NautilusDragInfo *drag_info,
GtkWidget *widget,
GtkFunction callback,
gpointer user_data)
{
if (nautilus_drag_autoscroll_in_scroll_region (widget)) {
if (drag_info->auto_scroll_timeout_id == 0) {
drag_info->waiting_to_autoscroll = TRUE;
drag_info->start_auto_scroll_in = eel_get_system_time()
+ AUTOSCROLL_INITIAL_DELAY;
drag_info->auto_scroll_timeout_id = g_timeout_add
(AUTOSCROLL_TIMEOUT_INTERVAL,
callback,
user_data);
}
} else {
if (drag_info->auto_scroll_timeout_id != 0) {
g_source_remove (drag_info->auto_scroll_timeout_id);
drag_info->auto_scroll_timeout_id = 0;
}
}
}
static int
auto_scroll_timeout_callback (gpointer data)
{
NemoIconContainer *container;
GtkWidget *widget;
float x_scroll_delta, y_scroll_delta;
GdkRectangle exposed_area;
GtkAllocation allocation;
g_assert (NEMO_IS_ICON_CONTAINER (data));
widget = GTK_WIDGET (data);
container = NEMO_ICON_CONTAINER (widget);
if (container->details->dnd_info->drag_info.waiting_to_autoscroll
&& container->details->dnd_info->drag_info.start_auto_scroll_in > eel_get_system_time()) {
/* not yet */
return TRUE;
}
container->details->dnd_info->drag_info.waiting_to_autoscroll = FALSE;
nemo_drag_autoscroll_calculate_delta (widget, &x_scroll_delta, &y_scroll_delta);
if (x_scroll_delta == 0 && y_scroll_delta == 0) {
/* no work */
return TRUE;
}
/* Clear the old dnd highlight frame */
dnd_highlight_queue_redraw (widget);
if (!nemo_icon_container_scroll (container, (int)x_scroll_delta, (int)y_scroll_delta)) {
/* the scroll value got pinned to a min or max adjustment value,
* we ended up not scrolling
*/
return TRUE;
}
/* Make sure the dnd highlight frame is redrawn */
dnd_highlight_queue_redraw (widget);
/* update cached drag start offsets */
container->details->dnd_info->drag_info.start_x -= x_scroll_delta;
container->details->dnd_info->drag_info.start_y -= y_scroll_delta;
/* Due to a glitch in GtkLayout, whe need to do an explicit draw of the exposed
* area.
* Calculate the size of the area we need to draw
*/
gtk_widget_get_allocation (widget, &allocation);
exposed_area.x = allocation.x;
exposed_area.y = allocation.y;
exposed_area.width = allocation.width;
exposed_area.height = allocation.height;
if (x_scroll_delta > 0) {
exposed_area.x = exposed_area.width - x_scroll_delta;
} else if (x_scroll_delta < 0) {
exposed_area.width = -x_scroll_delta;
}
if (y_scroll_delta > 0) {
exposed_area.y = exposed_area.height - y_scroll_delta;
} else if (y_scroll_delta < 0) {
exposed_area.height = -y_scroll_delta;
}
/* offset it to 0, 0 */
exposed_area.x -= allocation.x;
exposed_area.y -= allocation.y;
gtk_widget_queue_draw_area (widget,
exposed_area.x,
exposed_area.y,
exposed_area.width,
exposed_area.height);
return TRUE;
}
