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x11: Implement drag cancel animation

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Showing the drag cancel animation can be done in the X11
drag context implementation now that we hold the drag
window there, and have the start coordinates.

Since we can't control if and when the application destroys
the drag widget, we take a snapshot of the window contents
and display that during the animation. This should be good
enough for all practical purposes.
This commit is contained in:
Matthias Clasen 2015-12-07 18:28:06 -05:00
parent c590b83397
commit 23b2b49321
1 changed files with 94 additions and 0 deletions
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94
gdk/x11/gdkdnd-x11.c
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@ -193,6 +193,8 @@ static GdkWindow * gdk_x11_drag_context_get_drag_window (GdkDragContext *context
static void gdk_x11_drag_context_set_hotspot (GdkDragContext *context,
gint hot_x,
gint hot_y);
static void gdk_x11_drag_context_drop_done (GdkDragContext *context,
gboolean success);
static void
gdk_x11_drag_context_class_init (GdkX11DragContextClass *klass)
@ -213,6 +215,7 @@ gdk_x11_drag_context_class_init (GdkX11DragContextClass *klass)
context_class->get_selection = gdk_x11_drag_context_get_selection;
context_class->get_drag_window = gdk_x11_drag_context_get_drag_window;
context_class->set_hotspot = gdk_x11_drag_context_set_hotspot;
context_class->drop_done = gdk_x11_drag_context_drop_done;
}
static void
@ -2486,3 +2489,94 @@ gdk_x11_drag_context_set_hotspot (GdkDragContext *context,
x11_context->hot_x = hot_x;
x11_context->hot_y = hot_y;
}
static double
ease_out_cubic (double t)
{
double p = t - 1;
return p * p * p + 1;
}
#define ANIM_TIME 500000 /* half a second */
typedef struct _GdkDragAnim GdkDragAnim;
struct _GdkDragAnim {
GdkX11DragContext *context;
GdkFrameClock *frame_clock;
gint64 start_time;
};
static void
gdk_drag_anim_destroy (GdkDragAnim *anim)
{
g_object_unref (anim->context);
g_slice_free (GdkDragAnim, anim);
}
static gboolean
gdk_drag_anim_timeout (gpointer data)
{
GdkDragAnim *anim = data;
GdkX11DragContext *context = anim->context;
GdkFrameClock *frame_clock = anim->frame_clock;
gint64 current_time;
double f;
double t;
if (!frame_clock)
return G_SOURCE_REMOVE;
current_time = gdk_frame_clock_get_frame_time (frame_clock);
f = (current_time - anim->start_time) / (double) ANIM_TIME;
if (f >= 1.0)
return G_SOURCE_REMOVE;
t = ease_out_cubic (f);
gdk_window_show (context->drag_window);
gdk_window_move (context->drag_window,
context->last_x + (context->start_x - context->last_x) * t,
context->last_y + (context->start_y - context->last_y) * t);
gdk_window_set_opacity (context->drag_window, 1.0 - f);
return G_SOURCE_CONTINUE;
}
static void
gdk_x11_drag_context_drop_done (GdkDragContext *context,
gboolean success)
{
GdkX11DragContext *x11_context = GDK_X11_DRAG_CONTEXT (context);
GdkDragAnim *anim;
GdkPixbuf *pixbuf;
cairo_surface_t *surface;
cairo_pattern_t *pattern;
if (success)
return;
pixbuf = gdk_pixbuf_get_from_window (x11_context->drag_window,
0, 0,
gdk_window_get_width (x11_context->drag_window),
gdk_window_get_height (x11_context->drag_window));
surface = gdk_cairo_surface_create_from_pixbuf (pixbuf, 0, x11_context->drag_window);
pattern = cairo_pattern_create_for_surface (surface);
gdk_window_set_background_pattern (x11_context->drag_window, pattern);
cairo_pattern_destroy (pattern);
cairo_surface_destroy (surface);
g_object_unref (pixbuf);
anim = g_slice_new0 (GdkDragAnim);
anim->context = g_object_ref (x11_context);
anim->frame_clock = gdk_window_get_frame_clock (x11_context->drag_window);
anim->start_time = gdk_frame_clock_get_frame_time (anim->frame_clock);
gdk_threads_add_timeout_full (G_PRIORITY_DEFAULT, 17,
gdk_drag_anim_timeout, anim,
(GDestroyNotify) gdk_drag_anim_destroy);
}