[gthumb] update the quality after a delay

[Paolo Bacchilega <paobac src gnome org>]

commit a92d777727950992f4bf171d54a34a7fd118b689
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Wed Oct 2 23:38:17 2013 +0200

    update the quality after a delay

 extensions/image_viewer/gth-image-viewer-page.c |   49 +++++++++++++++++++----
 1 files changed, 41 insertions(+), 8 deletions(-)
---
diff --git a/extensions/image_viewer/gth-image-viewer-page.c b/extensions/image_viewer/gth-image-viewer-page.c
index 9b5d44e..8f64587 100644
--- a/extensions/image_viewer/gth-image-viewer-page.c
+++ b/extensions/image_viewer/gth-image-viewer-page.c
@@ -27,6 +27,9 @@
 #include "preferences.h"
 
 
+#define UPDATE_QUALITY_DELAY 200
+
+
 static void gth_viewer_page_interface_init (GthViewerPageInterface *iface);
 
 
@@ -48,12 +51,11 @@ struct _GthImageViewerPagePrivate {
        guint              browser_merge_id;
        GthImageHistory   *history;
        GthFileData       *file_data;
-       guint              hide_mouse_timeout;
-       guint              motion_signal;
        gboolean           image_changed;
        gboolean           loading_image;
        GFile             *last_loaded;
        gboolean           can_paste;
+       guint              update_quality_event;
 };
 
 
@@ -292,18 +294,24 @@ clear_data:
 }
 
 
-static void
-update_image_quality_if_required (GthImageViewerPage *self)
+static gboolean
+update_quality_cb (gpointer user_data)
 {
-       GthFileData *file_data;
-       double       zoom;
+       GthImageViewerPage *self = user_data;
+       GthFileData        *file_data;
+       double              zoom;
+
+       if (self->priv->update_quality_event != 0) {
+               g_source_remove (self->priv->update_quality_event);
+               self->priv->update_quality_event = 0;
+       }
 
        if (self->priv->loading_image)
-               return;
+               return FALSE;
 
        file_data = self->priv->image_changed ? GTH_MODIFIED_IMAGE : self->priv->file_data;
-
        zoom = gth_image_viewer_get_zoom (GTH_IMAGE_VIEWER (self->priv->viewer));
+
        if (zoom >= 1.0) {
                int requested_size;
                int original_width;
@@ -341,6 +349,26 @@ update_image_quality_if_required (GthImageViewerPage *self)
                                                  NULL);
                }
        }
+
+
+       return FALSE;
+}
+
+
+static void
+update_image_quality_if_required (GthImageViewerPage *self)
+{
+       if (self->priv->loading_image)
+               return;
+
+       if (self->priv->update_quality_event != 0) {
+               g_source_remove (self->priv->update_quality_event);
+               self->priv->update_quality_event = 0;
+       }
+
+       self->priv->update_quality_event = g_timeout_add (UPDATE_QUALITY_DELAY,
+                                                         update_quality_cb,
+                                                         self);
 }
 
 
@@ -1491,6 +1519,10 @@ gth_image_viewer_page_finalize (GObject *obj)
 
        self = GTH_IMAGE_VIEWER_PAGE (obj);
 
+       if (self->priv->update_quality_event != 0) {
+               g_source_remove (self->priv->update_quality_event);
+               self->priv->update_quality_event = 0;
+       }
        g_object_unref (self->priv->settings);
        g_object_unref (self->priv->history);
        _g_object_unref (self->priv->file_data);
@@ -1544,6 +1576,7 @@ gth_image_viewer_page_init (GthImageViewerPage *self)
        self->priv->can_paste = FALSE;
        self->priv->viewer_merge_id = 0;
        self->priv->browser_merge_id = 0;
+       self->priv->update_quality_event = 0;
 }