GtkOffscreenWindow implementation for #604901

1 files changed, 200 insertions, 0 deletions

diff --git a/gtk/gtkoffscreenwindow.c b/gtk/gtkoffscreenwindow.c
new file mode 100644
index 0000000000..bb3efaf86f
--- /dev/null
+++ b/gtk/gtkoffscreenwindow.c
@@ -0,0 +1,200 @@
+#include "gtkoffscreenwindow.h"
+
+G_DEFINE_TYPE (GtkOffscreenWindow, gtk_offscreen_window, GTK_TYPE_WINDOW);
+
+static void
+gtk_offscreen_window_size_request (GtkWidget *widget,
+                                   GtkRequisition *requisition)
+{
+  GtkBin *bin = GTK_BIN (widget);
+  gint border_width;
+  gint default_width, default_height;
+
+  border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
+
+  requisition->width = border_width * 2;
+  requisition->height = border_width * 2;
+
+  if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
+    {
+      GtkRequisition child_req;
+
+      gtk_widget_size_request (bin->child, &child_req);
+
+      requisition->width += child_req.width;
+      requisition->height += child_req.height;
+    }
+
+  gtk_window_get_default_size (GTK_WINDOW (widget),
+                               &default_width, &default_height);
+  if (default_width > 0)
+    requisition->width = default_width;
+
+  if (default_height > 0)
+    requisition->height = default_height;
+}
+
+static void
+gtk_offscreen_window_size_allocate (GtkWidget *widget,
+                                    GtkAllocation *allocation)
+{
+  GtkBin *bin = GTK_BIN (widget);
+  gint border_width;
+
+  widget->allocation = *allocation;
+
+  border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
+
+  if (GTK_WIDGET_REALIZED (widget))
+    gdk_window_move_resize (widget->window,
+                            allocation->x,
+                            allocation->y,
+                            allocation->width,
+                            allocation->height);
+
+  if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
+    {
+      GtkAllocation  child_alloc;
+
+      child_alloc.x = border_width;
+      child_alloc.y = border_width;
+      child_alloc.width = allocation->width - 2 * border_width;
+      child_alloc.height = allocation->height - 2 * border_width;
+
+      gtk_widget_size_allocate (bin->child, &child_alloc);
+    }
+
+  gtk_widget_queue_draw (widget);
+}
+
+static void
+gtk_offscreen_window_realize (GtkWidget *widget)
+{
+  GtkBin *bin;
+  GdkWindowAttr attributes;
+  gint attributes_mask;
+  gint border_width;
+
+  bin = GTK_BIN (widget);
+
+  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
+
+  border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
+
+  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_OFFSCREEN;
+  attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
+  attributes.visual = gtk_widget_get_visual (widget);
+  attributes.colormap = gtk_widget_get_colormap (widget);
+  attributes.wclass = GDK_INPUT_OUTPUT;
+
+  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
+
+  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
+                                   &attributes, attributes_mask);
+  gdk_window_set_user_data (widget->window, widget);
+
+  if (bin->child)
+    gtk_widget_set_parent_window (bin->child, widget->window);
+
+  widget->style = gtk_style_attach (widget->style, widget->window);
+
+  gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
+}
+
+static void
+gtk_offscreen_window_resize (GtkWidget *widget)
+{
+  GtkAllocation allocation = { 0, 0 };
+  GtkRequisition requisition;
+
+  gtk_widget_size_request (widget, &requisition);
+
+  allocation.width  = requisition.width;
+  allocation.height = requisition.height;
+  gtk_widget_size_allocate (widget, &allocation);
+}
+
+static void
+move_focus (GtkWidget       *widget,
+            GtkDirectionType dir)
+{
+  gtk_widget_child_focus (widget, dir);
+
+  if (!GTK_CONTAINER (widget)->focus_child)
+    gtk_window_set_focus (GTK_WINDOW (widget), NULL);
+}
+
+static void
+gtk_offscreen_window_show (GtkWidget *widget)
+{
+  gboolean need_resize;
+  GtkContainer *container;
+
+  GTK_WIDGET_SET_FLAGS (widget, GTK_VISIBLE);
+
+  container = GTK_CONTAINER (widget);
+  need_resize = container->need_resize || !GTK_WIDGET_REALIZED (widget);
+  container->need_resize = FALSE;
+
+  if (need_resize)
+    gtk_offscreen_window_resize (widget);
+
+  gtk_widget_map (widget);
+
+  /* Try to make sure that we have some focused widget */
+  if (!gtk_window_get_focus (GTK_WINDOW (widget)))
+    move_focus (widget, GTK_DIR_TAB_FORWARD);
+}
+
+static void
+gtk_offscreen_window_hide (GtkWidget *widget)
+{
+  GTK_WIDGET_UNSET_FLAGS (widget, GTK_VISIBLE);
+  gtk_widget_unmap (widget);
+}
+
+static void
+gtk_offscreen_window_check_resize (GtkContainer *container)
+{
+  GtkWidget *widget = GTK_WIDGET (container);
+
+  if (GTK_WIDGET_VISIBLE (widget))
+    gtk_offscreen_window_resize (widget);
+}
+
+static void
+gtk_offscreen_window_class_init (GtkOffscreenWindowClass *class)
+{
+  GtkWidgetClass *widget_class;
+  GtkContainerClass *container_class;
+
+  widget_class = GTK_WIDGET_CLASS (class);
+  container_class = GTK_CONTAINER_CLASS (class);
+
+  widget_class->realize = gtk_offscreen_window_realize;
+  widget_class->show = gtk_offscreen_window_show;
+  widget_class->hide = gtk_offscreen_window_hide;
+  widget_class->size_request = gtk_offscreen_window_size_request;
+  widget_class->size_allocate = gtk_offscreen_window_size_allocate;
+
+  container_class->check_resize = gtk_offscreen_window_check_resize;
+}
+
+static void
+gtk_offscreen_window_init (GtkOffscreenWindow *bin)
+{
+}
+
+GtkWidget *
+gtk_offscreen_window_new (void)
+{
+  return g_object_new (gtk_offscreen_window_get_type (), NULL);
+}
+
+
+#define __GTK_OFFSCREEN_WINDOW_C__
+#include "gtkaliasdef.c"