gcolorsel DnD patch

[David Knight <david ritter demon co uk>]

I've added DnD support to gcolorsel, the diff is attached.

As well as the normal left drag I've added support for middle dragging as
well which uses GDK_ACTION_ASK instead of GDK_ACTION_COPY. 
(I wanted the ability to ask what to do for use in Screem)

I've also added a close button, as was mentioned in the TODO file.



David

-- 
The superior man understands what is right;
the inferior man understands what will sell.
		-- Confucius
--- gcolorsel.c	Fri Jun 11 02:24:40 1999
+++ gcolorsel.c	Fri Jun 11 04:47:58 1999
@@ -25,6 +25,16 @@
                     NULL
 };
 
+enum {
+	TARGET_COLOUR
+};
+
+static const GtkTargetEntry drag_types[] = {
+        { "application/x-color", 0, TARGET_COLOUR },
+};
+static const gint n_drag_types = sizeof(drag_types) / sizeof(drag_types[0]);
+
+
 GtkWidget *window, *clist;
 GdkGC *gc;
 GdkColor black;
@@ -41,6 +51,18 @@
 			      gint column,
 			      GdkEventButton *event,
 			      gpointer data);
+static void button_press_cb(GtkWidget *widget,
+			    GdkEventButton *event,
+			    gpointer data );
+static void drag_data_get_cb(GtkWidget *widget,
+			     GdkDragContext *context,
+			     GtkSelectionData *selection_data,
+			     guint info,
+			     guint time,
+			     gpointer data);
+static void drag_begin_cb(GtkWidget *widget, 
+			  GdkDragContext *context, 
+			  gpointer data);
 void 		menu_item_cb(GtkWidget *menuitem, gpointer data);
 void make_menus(GnomeApp *app);
 
@@ -55,6 +77,7 @@
     GtkWidget *menu, *dropdown;
     GtkWidget *label, *sw;
     GtkWidget *name_e, *value_e;
+    GtkWidget *button;
 
 #ifdef ENABLE_NLS
     bindtextdomain(PACKAGE, GNOMELOCALEDIR);
@@ -113,6 +136,12 @@
     /* some silly stuff to avoid too many globals */
     gtk_object_set_data(GTK_OBJECT(clist), "name_entry", name_e);
     gtk_object_set_data(GTK_OBJECT(clist), "value_entry", value_e);
+
+    /* close button */
+    button = gnome_stock_button(GNOME_STOCK_BUTTON_CLOSE);
+    gtk_signal_connect(GTK_OBJECT(button), "clicked", 
+		       GTK_SIGNAL_FUNC(delete_event), NULL);
+    gtk_box_pack_start(GTK_BOX(vbox), button, FALSE, FALSE, 2);
 	
     gnome_app_set_contents(GNOME_APP(window), vbox);
 	
@@ -141,6 +170,65 @@
     gtk_entry_set_text(GTK_ENTRY(name_e), tmp);
 }	        
 
+static void button_press_cb(GtkWidget *widget,
+			    GdkEventButton *event,
+			    gpointer data )
+{
+	gint row = -1;
+	gint col;
+
+	gtk_clist_get_selection_info(GTK_CLIST(widget), event->x, event->y,
+				     &row, &col);
+
+	gtk_object_set_data(GTK_OBJECT(widget), "drag_start", (gpointer*)row);
+}
+
+static void drag_data_get_cb(GtkWidget *widget,
+			     GdkDragContext *context,
+			     GtkSelectionData *selection_data,
+			     guint info,
+			     guint time,
+			     gpointer data)
+{
+	RGBColor *c;
+	gint row;
+    	guint16 rgb[ 4 ];
+
+	if ( !GTK_CLIST(widget)->selection )
+		return;
+
+	row = (gint)gtk_object_get_data(GTK_OBJECT(widget), "drag_start");
+
+	if (row == -1)
+		return;
+
+	c = gtk_clist_get_row_data(GTK_CLIST(widget), row);
+	rgb[0] = (c->r)*256;
+	rgb[1] = (c->g)*256;
+	rgb[2] = (c->b)*256;
+	rgb[3] = 0;
+
+	switch ( info ) {
+	case TARGET_COLOUR:
+		gtk_selection_data_set( selection_data, selection_data->target,
+					8, (guchar*)rgb, 8 );
+		break;
+	}
+
+}
+
+static void drag_begin_cb(GtkWidget *widget, 
+			  GdkDragContext *context, 
+			  gpointer data)
+{
+	gint row;
+
+	row = (gint)gtk_object_get_data(GTK_OBJECT(widget), "drag_start");
+
+	if ( row != -1 )
+		gtk_clist_select_row(GTK_CLIST(widget), row, 1);
+}
+
 static GtkWidget *create_clist(void)
 {
     GdkColormap *colormap;
@@ -157,6 +245,17 @@
     gtk_clist_set_column_title(GTK_CLIST(clist), 2, _("Name"));
     gtk_clist_column_titles_show(GTK_CLIST(clist));
 
+    /* set drag source */
+    gtk_drag_source_set(clist, GDK_BUTTON1_MASK|GDK_BUTTON2_MASK,
+			drag_types, n_drag_types,
+			GDK_ACTION_COPY | GDK_ACTION_ASK);
+    /* connect drag signals */
+    gtk_signal_connect(GTK_OBJECT(clist), "button_press_event",
+		       GTK_SIGNAL_FUNC(button_press_cb), NULL);
+    gtk_signal_connect(GTK_OBJECT(clist), "drag_data_get",
+		       GTK_SIGNAL_FUNC(drag_data_get_cb), NULL);
+    gtk_signal_connect(GTK_OBJECT(clist), "drag_begin",
+		       GTK_SIGNAL_FUNC(drag_begin_cb), NULL);
     gtk_signal_connect(GTK_OBJECT(clist), "select_row", 
 		       GTK_SIGNAL_FUNC(select_row_cb), NULL);