Start of work on a widget to allow you to drag other widgets in and out of

windows (i.e. like KDE has for its menu bars).

- sopwith

gtk/gtkhandlebox.c

+/* GTK - The GIMP Toolkit
+ * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include "gtksignal.h"
+#include "gtkhandlebox.h"
+
+
+static void gtk_handle_box_class_init               (GtkHandleBoxClass *klass);
+static void gtk_handle_box_init                     (GtkHandleBox      *event_box);
+static void gtk_handle_box_realize                  (GtkWidget        *widget);
+static void gtk_handle_box_size_request             (GtkWidget        *widget,
+						   GtkRequisition   *requisition);
+static void gtk_handle_box_size_allocate            (GtkWidget        *widget,
+						   GtkAllocation    *allocation);
+static void gtk_handle_box_draw                     (GtkWidget    *widget,
+						   GdkRectangle *area);
+static gint gtk_handle_box_expose                   (GtkWidget      *widget,
+						   GdkEventExpose *event);
+
+
+guint
+gtk_handle_box_get_type ()
+{
+  static guint event_box_type = 0;
+
+  if (!event_box_type)
+    {
+      GtkTypeInfo handle_box_info =
+      {
+	"GtkHandleBox",
+	sizeof (GtkHandleBox),
+	sizeof (GtkHandleBoxClass),
+	(GtkClassInitFunc) gtk_handle_box_class_init,
+	(GtkObjectInitFunc) gtk_handle_box_init,
+	(GtkArgFunc) NULL,
+      };
+
+      event_box_type = gtk_type_unique (gtk_event_box_get_type (), &handle_box_info);
+    }
+
+  return event_box_type;
+}
+
+static void
+gtk_handle_box_class_init (GtkHandleBoxClass *class)
+{
+  GtkWidgetClass *widget_class;
+
+  widget_class = (GtkWidgetClass*) class;
+
+  widget_class->realize = gtk_handle_box_realize;
+  widget_class->size_request = gtk_handle_box_size_request;
+  widget_class->size_allocate = gtk_handle_box_size_allocate;
+  widget_class->draw = gtk_handle_box_draw;
+  widget_class->expose_event = gtk_handle_box_expose;
+}
+
+static void
+gtk_handle_box_init (GtkHandleBox *event_box)
+{
+  GTK_WIDGET_UNSET_FLAGS (event_box, GTK_NO_WINDOW);
+  GTK_WIDGET_SET_FLAGS (event_box, GTK_BASIC);
+  event_box->show_handle = TRUE;
+  event_box->real_parent = NULL;
+}
+
+GtkWidget*
+gtk_handle_box_new ()
+{
+  return GTK_WIDGET ( gtk_type_new (gtk_handle_box_get_type ()));
+}
+
+static void
+gtk_handle_box_realize (GtkWidget *widget)
+{
+  GdkWindowAttr attributes;
+  gint attributes_mask;
+
+  g_return_if_fail (widget != NULL);
+  g_return_if_fail (GTK_IS_HANDLE_BOX (widget));
+
+  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
+
+  attributes.x = widget->allocation.x;
+  attributes.y = widget->allocation.y;
+  attributes.width = widget->allocation.width;
+  attributes.height = widget->allocation.height;
+  attributes.window_type = GDK_WINDOW_CHILD;
+  attributes.wclass = GDK_INPUT_OUTPUT;
+  attributes.visual = gtk_widget_get_visual (widget);
+  attributes.colormap = gtk_widget_get_colormap (widget);
+  attributes.event_mask = gtk_widget_get_events (widget)
+			| GDK_BUTTON_MOTION_MASK
+			| GDK_BUTTON_PRESS_MASK
+			| GDK_BUTTON_RELEASE_MASK
+			| GDK_EXPOSURE_MASK
+			| GDK_ENTER_NOTIFY_MASK
+			| GDK_LEAVE_NOTIFY_MASK;
+
+  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
+
+  widget->window = gdk_window_new (widget->parent->window, &attributes, attributes_mask);
+  gdk_window_set_user_data (widget->window, widget);
+
+  widget->style = gtk_style_attach (widget->style, widget->window);
+  gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
+}
+
+static void
+gtk_handle_box_size_request (GtkWidget      *widget,
+			GtkRequisition *requisition)
+{
+  GtkBin *bin;
+
+  g_return_if_fail (widget != NULL);
+  g_return_if_fail (GTK_IS_HANDLE_BOX (widget));
+  g_return_if_fail (requisition != NULL);
+
+  bin = GTK_BIN (widget);
+
+  requisition->width = GTK_CONTAINER (widget)->border_width * 2;
+  requisition->height = GTK_CONTAINER (widget)->border_width * 2;
+
+  if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
+    {
+      gtk_widget_size_request (bin->child, &bin->child->requisition);
+
+      requisition->width += bin->child->requisition.width;
+      requisition->height += bin->child->requisition.height;
+    }
+}
+
+static void
+gtk_handle_box_size_allocate (GtkWidget     *widget,
+			    GtkAllocation *allocation)
+{
+  GtkBin *bin;
+  GtkAllocation child_allocation;
+
+  g_return_if_fail (widget != NULL);
+  g_return_if_fail (GTK_IS_HANDLE_BOX (widget));
+  g_return_if_fail (allocation != NULL);
+
+  widget->allocation = *allocation;
+  bin = GTK_BIN (widget);
+
+  child_allocation.x = 0;
+  child_allocation.y = 0;
+  child_allocation.width = allocation->width - GTK_CONTAINER (widget)->border_width * 2;
+  child_allocation.height = allocation->height - GTK_CONTAINER (widget)->border_width * 2;
+
+  if (GTK_WIDGET_REALIZED (widget))
+    {
+      gdk_window_move_resize (widget->window,
+			      allocation->x + GTK_CONTAINER (widget)->border_width,
+			      allocation->y + GTK_CONTAINER (widget)->border_width,
+			      child_allocation.width,
+			      child_allocation.height);
+    }
+  
+  if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
+    {
+      gtk_widget_size_allocate (bin->child, &child_allocation);
+    }
+}
+
+static void
+gtk_handle_box_draw (GtkWidget    *widget,
+		   GdkRectangle *area)
+{
+  GtkBin *bin;
+  GdkRectangle child_area;
+
+  g_return_if_fail (widget != NULL);
+  g_return_if_fail (GTK_IS_HANDLE_BOX (widget));
+  g_return_if_fail (area != NULL);
+
+  if (GTK_WIDGET_DRAWABLE (widget))
+    {
+      bin = GTK_BIN (widget);
+
+      if (bin->child)
+	{
+	  if (gtk_widget_intersect (bin->child, area, &child_area))
+	    gtk_widget_draw (bin->child, &child_area);
+	}
+    }
+}
+
+static gint
+gtk_handle_box_expose (GtkWidget      *widget,
+		     GdkEventExpose *event)
+{
+  GtkBin *bin;
+  GdkEventExpose child_event;
+
+  g_return_val_if_fail (widget != NULL, FALSE);
+  g_return_val_if_fail (GTK_IS_HANDLE_BOX (widget), FALSE);
+  g_return_val_if_fail (event != NULL, FALSE);
+
+  if (GTK_WIDGET_DRAWABLE (widget))
+    {
+      bin = GTK_BIN (widget);
+
+      child_event = *event;
+      if (bin->child &&
+	  GTK_WIDGET_NO_WINDOW (bin->child) &&
+	  gtk_widget_intersect (bin->child, &event->area, &child_event.area))
+	gtk_widget_event (bin->child, (GdkEvent*) &child_event);
+    }
+
+  return FALSE;
+}
+

gtk/gtkhandlebox.h

+/* GTK - The GIMP Toolkit
+ * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#ifndef __GTK_HANDLE_BOX_H__
+#define __GTK_HANDLE_BOX_H__
+
+
+#include <gdk/gdk.h>
+#include <gtk/gtkeventbox.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+
+#define GTK_HANDLE_BOX(obj)          GTK_CHECK_CAST (obj, gtk_handle_box_get_type (), GtkHandleBox)
+#define GTK_HANDLE_BOX_CLASS(klass)  GTK_CHECK_CLASS_CAST (klass, gtk_handle_box_get_type (), GtkHandleBoxClass)
+#define GTK_IS_HANDLE_BOX(obj)       GTK_CHECK_TYPE (obj, gtk_handle_box_get_type ())
+
+
+typedef struct _GtkHandleBox       GtkHandleBox;
+typedef struct _GtkHandleBoxClass  GtkHandleBoxClass;
+
+struct _GtkHandleBox
+{
+  GtkEventBox bin;
+  GtkWidget *real_parent;
+};
+
+struct _GtkHandleBoxClass
+{
+  GtkEventBoxClass parent_class;
+};
+
+guint          gtk_handle_box_get_type        (void);
+GtkWidget*     gtk_handle_box_new             (void);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+
+#endif /* __GTK_HANDLE_BOX_H__ */