[gtk/wip/otte/dnd: 3/10] colorbutton, colorswatch: Simplify DND

[Benjamin Otte <otte src gnome org>]

commit 91d91a29e834a3802a8bdefe417f277f8ef57737
Author: Benjamin Otte <otte redhat com>
Date:   Sun Feb 16 18:48:45 2020 +0100

    colorbutton, colorswatch: Simplify DND
    
    - Use GDK_TYPE_RGBA and let GDK do the conversion from
      application-x-color
    - Don't do extra mime type checks when accept() does that for us already

 gtk/gtkcolorbutton.c | 19 ++++++-------------
 gtk/gtkcolorswatch.c | 20 +++++---------------
 2 files changed, 11 insertions(+), 28 deletions(-)
---
diff --git a/gtk/gtkcolorbutton.c b/gtk/gtkcolorbutton.c
index 4d304c1a46..91a96301c6 100644
--- a/gtk/gtkcolorbutton.c
+++ b/gtk/gtkcolorbutton.c
@@ -126,8 +126,6 @@ static void gtk_color_button_clicked       (GtkButton        *button,
 
 static guint color_button_signals[LAST_SIGNAL] = { 0 };
 
-static const char *drop_types[] = { "application/x-color" };
-
 static void gtk_color_button_iface_init (GtkColorChooserInterface *iface);
 
 G_DEFINE_TYPE_WITH_CODE (GtkColorButton, gtk_color_button, GTK_TYPE_WIDGET,
@@ -258,13 +256,8 @@ gtk_color_button_drag_drop (GtkDropTarget  *dest,
                             int             y,
                             GtkColorButton *button)
 {
-  if (gdk_drop_has_value (drop, GDK_TYPE_RGBA))
-    {
-      gdk_drop_read_value_async (drop, GDK_TYPE_RGBA, G_PRIORITY_DEFAULT, NULL, got_color, button);
-      return TRUE;
-    }
-
-  return FALSE;
+  gdk_drop_read_value_async (drop, GDK_TYPE_RGBA, G_PRIORITY_DEFAULT, NULL, got_color, button);
+  return TRUE;
 }
 
 static void
@@ -302,7 +295,7 @@ gtk_color_button_init (GtkColorButton *button)
   GtkColorButtonPrivate *priv = gtk_color_button_get_instance_private (button);
   PangoLayout *layout;
   PangoRectangle rect;
-  GdkContentFormats *targets;
+  GdkContentFormats *formats;
   GtkDragSource *source;
   GtkDropTarget *dest;
 
@@ -328,11 +321,11 @@ gtk_color_button_init (GtkColorButton *button)
   priv->rgba.alpha = 1;
   priv->use_alpha = FALSE;
 
-  targets = gdk_content_formats_new (drop_types, G_N_ELEMENTS (drop_types));
-  dest = gtk_drop_target_new (targets, GDK_ACTION_COPY);
+  formats = gdk_content_formats_new_for_gtype (GDK_TYPE_RGBA);
+  dest = gtk_drop_target_new (formats, GDK_ACTION_COPY);
   g_signal_connect (dest, "drag-drop", G_CALLBACK (gtk_color_button_drag_drop), button);
   gtk_widget_add_controller (GTK_WIDGET (button), GTK_EVENT_CONTROLLER (dest));
-  gdk_content_formats_unref (targets);
+  gdk_content_formats_unref (formats);
 
   source = gtk_drag_source_new ();
   g_signal_connect (source, "prepare", G_CALLBACK (gtk_color_button_drag_prepare), button);
diff --git a/gtk/gtkcolorswatch.c b/gtk/gtkcolorswatch.c
index 4a2ad7e93b..b59c49862b 100644
--- a/gtk/gtkcolorswatch.c
+++ b/gtk/gtkcolorswatch.c
@@ -159,13 +159,8 @@ swatch_drag_drop (GtkDropTarget  *dest,
                   int             y,
                   GtkColorSwatch *swatch)
 {
-  if (gdk_drop_has_value (drop, GDK_TYPE_RGBA))
-    {
-      gdk_drop_read_value_async (drop, GDK_TYPE_RGBA, G_PRIORITY_DEFAULT, NULL, got_color, swatch);
-      return TRUE;
-    }
-
-  return FALSE;
+  gdk_drop_read_value_async (drop, GDK_TYPE_RGBA, G_PRIORITY_DEFAULT, NULL, got_color, swatch);
+  return TRUE;
 }
 
 static void
@@ -574,10 +569,6 @@ gtk_color_swatch_new (void)
   return (GtkWidget *) g_object_new (GTK_TYPE_COLOR_SWATCH, NULL);
 }
 
-static const char *dnd_targets[] = {
-  "application/x-color"
-};
-
 static GdkContentProvider *
 gtk_color_swatch_drag_prepare (GtkDragSource  *source,
                                double          x,
@@ -670,13 +661,12 @@ gtk_color_swatch_set_can_drop (GtkColorSwatch *swatch,
 
   if (can_drop && !priv->dest)
     {
-      GdkContentFormats *targets;
+      GdkContentFormats *formats;
 
-      targets = gdk_content_formats_new (dnd_targets, G_N_ELEMENTS (dnd_targets));
-      priv->dest = gtk_drop_target_new (targets, GDK_ACTION_COPY);
+      formats = gdk_content_formats_new_for_gtype (GDK_TYPE_RGBA);
+      priv->dest = gtk_drop_target_new (formats, GDK_ACTION_COPY);
       g_signal_connect (priv->dest, "drag-drop", G_CALLBACK (swatch_drag_drop), swatch);
       gtk_widget_add_controller (GTK_WIDGET (swatch), GTK_EVENT_CONTROLLER (priv->dest));
-      gdk_content_formats_unref (targets);
     }
   if (!can_drop && priv->dest)
     {