forked from AuroraMiddleware/gtk
Add another offscreen demo
This demo shows rendering multiple times, to achieve a reflection effect. Inspired by an earlier demo by macslow.
This commit is contained in:
Matthias Clasen
parent
582b281761
commit
d22b79f1b6
@ -29,6 +29,7 @@ demos = \
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list_store.c \
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list_store.c \
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menus.c \
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menus.c \
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offscreen_window.c \
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offscreen_window.c \
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offscreen_window2.c \
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panes.c \
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panes.c \
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pickers.c \
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pickers.c \
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pixbufs.c \
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pixbufs.c \
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@ -1,4 +1,4 @@
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/* Offscreen windows
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/* Offscreen windows/Rotated button
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*
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*
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* Offscreen windows can be used to transform parts of a widget
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* Offscreen windows can be used to transform parts of a widget
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* hierarchy. Note that the rotated button is fully functional.
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* hierarchy. Note that the rotated button is fully functional.
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@ -538,7 +538,7 @@ do_offscreen_window (GtkWidget *do_widget)
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_screen (GTK_WINDOW (window),
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gtk_window_set_screen (GTK_WINDOW (window),
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gtk_widget_get_screen (do_widget));
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gtk_widget_get_screen (do_widget));
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gtk_window_set_title (GTK_WINDOW (window), "Offscreen windows");
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gtk_window_set_title (GTK_WINDOW (window), "Rotated widget");
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g_signal_connect (window, "destroy",
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g_signal_connect (window, "destroy",
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G_CALLBACK (gtk_widget_destroyed), &window);
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G_CALLBACK (gtk_widget_destroyed), &window);
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502
demos/gtk-demo/offscreen_window2.c
Normal file
502
demos/gtk-demo/offscreen_window2.c
Normal file
@ -0,0 +1,502 @@
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/* Offscreen windows/Effects
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*
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* Offscreen windows can be used to render elements multiple times to achieve
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* various effects.
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*/
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#include <gtk/gtk.h>
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#define GTK_TYPE_MIRROR_BIN (gtk_mirror_bin_get_type ())
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#define GTK_MIRROR_BIN(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_MIRROR_BIN, GtkMirrorBin))
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#define GTK_MIRROR_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_MIRROR_BIN, GtkMirrorBinClass))
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#define GTK_IS_MIRROR_BIN(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_MIRROR_BIN))
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#define GTK_IS_MIRROR_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_MIRROR_BIN))
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#define GTK_MIRROR_BIN_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_MIRROR_BIN, GtkMirrorBinClass))
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typedef struct _GtkMirrorBin GtkMirrorBin;
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typedef struct _GtkMirrorBinClass GtkMirrorBinClass;
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struct _GtkMirrorBin
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{
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GtkContainer container;
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GtkWidget *child;
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GdkWindow *offscreen_window;
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};
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struct _GtkMirrorBinClass
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{
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GtkContainerClass parent_class;
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};
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GType gtk_mirror_bin_get_type (void) G_GNUC_CONST;
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GtkWidget* gtk_mirror_bin_new (void);
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/*** implementation ***/
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static void gtk_mirror_bin_realize (GtkWidget *widget);
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static void gtk_mirror_bin_unrealize (GtkWidget *widget);
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static void gtk_mirror_bin_size_request (GtkWidget *widget,
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GtkRequisition *requisition);
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static void gtk_mirror_bin_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation);
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static gboolean gtk_mirror_bin_damage (GtkWidget *widget,
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GdkEventExpose *event);
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static gboolean gtk_mirror_bin_expose (GtkWidget *widget,
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GdkEventExpose *offscreen);
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static void gtk_mirror_bin_add (GtkContainer *container,
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GtkWidget *child);
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static void gtk_mirror_bin_remove (GtkContainer *container,
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GtkWidget *widget);
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static void gtk_mirror_bin_forall (GtkContainer *container,
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gboolean include_internals,
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GtkCallback callback,
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gpointer callback_data);
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static GType gtk_mirror_bin_child_type (GtkContainer *container);
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G_DEFINE_TYPE (GtkMirrorBin, gtk_mirror_bin, GTK_TYPE_CONTAINER);
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static void
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to_child (GtkMirrorBin *bin,
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double widget_x,
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double widget_y,
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double *x_out,
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double *y_out)
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{
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*x_out = widget_x;
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*y_out = widget_y;
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}
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static void
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to_parent (GtkMirrorBin *bin,
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double offscreen_x,
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double offscreen_y,
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double *x_out,
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double *y_out)
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{
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*x_out = offscreen_x;
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*y_out = offscreen_y;
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}
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static void
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gtk_mirror_bin_class_init (GtkMirrorBinClass *klass)
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{
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
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GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
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widget_class->realize = gtk_mirror_bin_realize;
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widget_class->unrealize = gtk_mirror_bin_unrealize;
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widget_class->size_request = gtk_mirror_bin_size_request;
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widget_class->size_allocate = gtk_mirror_bin_size_allocate;
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widget_class->expose_event = gtk_mirror_bin_expose;
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g_signal_override_class_closure (g_signal_lookup ("damage-event", GTK_TYPE_WIDGET),
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GTK_TYPE_MIRROR_BIN,
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g_cclosure_new (G_CALLBACK (gtk_mirror_bin_damage),
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NULL, NULL));
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container_class->add = gtk_mirror_bin_add;
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container_class->remove = gtk_mirror_bin_remove;
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container_class->forall = gtk_mirror_bin_forall;
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container_class->child_type = gtk_mirror_bin_child_type;
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}
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static void
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gtk_mirror_bin_init (GtkMirrorBin *bin)
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{
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GTK_WIDGET_UNSET_FLAGS (bin, GTK_NO_WINDOW);
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}
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GtkWidget *
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gtk_mirror_bin_new (void)
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{
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return g_object_new (GTK_TYPE_MIRROR_BIN, NULL);
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}
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static GdkWindow *
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pick_offscreen_child (GdkWindow *offscreen_window,
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double widget_x,
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double widget_y,
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GtkMirrorBin *bin)
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{
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GtkAllocation child_area;
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double x, y;
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if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
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{
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to_child (bin, widget_x, widget_y, &x, &y);
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child_area = bin->child->allocation;
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if (x >= 0 && x < child_area.width &&
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y >= 0 && y < child_area.height)
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return bin->offscreen_window;
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}
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return NULL;
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}
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static void
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offscreen_window_to_parent (GdkWindow *offscreen_window,
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double offscreen_x,
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double offscreen_y,
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double *parent_x,
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double *parent_y,
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GtkMirrorBin *bin)
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{
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to_parent (bin, offscreen_x, offscreen_y, parent_x, parent_y);
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}
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static void
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offscreen_window_from_parent (GdkWindow *window,
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double parent_x,
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double parent_y,
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double *offscreen_x,
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double *offscreen_y,
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GtkMirrorBin *bin)
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{
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to_child (bin, parent_x, parent_y, offscreen_x, offscreen_y);
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}
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static void
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gtk_mirror_bin_realize (GtkWidget *widget)
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{
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GtkMirrorBin *bin = GTK_MIRROR_BIN (widget);
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GdkWindowAttr attributes;
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gint attributes_mask;
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gint border_width;
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GtkRequisition child_requisition;
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GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
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border_width = GTK_CONTAINER (widget)->border_width;
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attributes.x = widget->allocation.x + border_width;
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attributes.y = widget->allocation.y + border_width;
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attributes.width = widget->allocation.width - 2 * border_width;
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attributes.height = widget->allocation.height - 2 * border_width;
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attributes.window_type = GDK_WINDOW_CHILD;
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attributes.event_mask = gtk_widget_get_events (widget)
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| GDK_EXPOSURE_MASK
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| GDK_POINTER_MOTION_MASK
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| GDK_BUTTON_PRESS_MASK
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| GDK_BUTTON_RELEASE_MASK
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| GDK_SCROLL_MASK
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| GDK_ENTER_NOTIFY_MASK
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| GDK_LEAVE_NOTIFY_MASK;
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attributes.visual = gtk_widget_get_visual (widget);
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attributes.colormap = gtk_widget_get_colormap (widget);
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attributes.wclass = GDK_INPUT_OUTPUT;
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attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
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widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
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&attributes, attributes_mask);
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gdk_window_set_user_data (widget->window, widget);
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g_signal_connect (widget->window, "pick-embedded-child",
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G_CALLBACK (pick_offscreen_child), bin);
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attributes.window_type = GDK_WINDOW_OFFSCREEN;
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child_requisition.width = child_requisition.height = 0;
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if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
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{
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attributes.width = bin->child->allocation.width;
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attributes.height = bin->child->allocation.height;
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}
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bin->offscreen_window = gdk_window_new (gtk_widget_get_root_window (widget),
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&attributes, attributes_mask);
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gdk_window_set_user_data (bin->offscreen_window, widget);
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if (bin->child)
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gtk_widget_set_parent_window (bin->child, bin->offscreen_window);
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gdk_offscreen_window_set_embedder (bin->offscreen_window, widget->window);
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g_signal_connect (bin->offscreen_window, "to-embedder",
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G_CALLBACK (offscreen_window_to_parent), bin);
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g_signal_connect (bin->offscreen_window, "from-embedder",
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G_CALLBACK (offscreen_window_from_parent), bin);
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widget->style = gtk_style_attach (widget->style, widget->window);
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gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
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gtk_style_set_background (widget->style, bin->offscreen_window, GTK_STATE_NORMAL);
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gdk_window_show (bin->offscreen_window);
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}
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static void
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gtk_mirror_bin_unrealize (GtkWidget *widget)
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{
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GtkMirrorBin *bin = GTK_MIRROR_BIN (widget);
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gdk_window_set_user_data (bin->offscreen_window, NULL);
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gdk_window_destroy (bin->offscreen_window);
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bin->offscreen_window = NULL;
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GTK_WIDGET_CLASS (gtk_mirror_bin_parent_class)->unrealize (widget);
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}
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static GType
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gtk_mirror_bin_child_type (GtkContainer *container)
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{
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GtkMirrorBin *bin = GTK_MIRROR_BIN (container);
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if (bin->child)
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return G_TYPE_NONE;
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return GTK_TYPE_WIDGET;
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}
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static void
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gtk_mirror_bin_add (GtkContainer *container,
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GtkWidget *widget)
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{
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GtkMirrorBin *bin = GTK_MIRROR_BIN (container);
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if (!bin->child)
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{
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gtk_widget_set_parent_window (widget, bin->offscreen_window);
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gtk_widget_set_parent (widget, GTK_WIDGET (bin));
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bin->child = widget;
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}
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else
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g_warning ("GtkMirrorBin cannot have more than one child\n");
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}
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static void
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gtk_mirror_bin_remove (GtkContainer *container,
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GtkWidget *widget)
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{
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GtkMirrorBin *bin = GTK_MIRROR_BIN (container);
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gboolean was_visible;
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was_visible = GTK_WIDGET_VISIBLE (widget);
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if (bin->child == widget)
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{
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gtk_widget_unparent (widget);
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bin->child = NULL;
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if (was_visible && GTK_WIDGET_VISIBLE (container))
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gtk_widget_queue_resize (GTK_WIDGET (container));
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}
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}
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static void
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gtk_mirror_bin_forall (GtkContainer *container,
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gboolean include_internals,
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GtkCallback callback,
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gpointer callback_data)
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{
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GtkMirrorBin *bin = GTK_MIRROR_BIN (container);
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g_return_if_fail (callback != NULL);
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if (bin->child)
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(*callback) (bin->child, callback_data);
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}
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static void
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gtk_mirror_bin_size_request (GtkWidget *widget,
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GtkRequisition *requisition)
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{
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GtkMirrorBin *bin = GTK_MIRROR_BIN (widget);
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GtkRequisition child_requisition;
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child_requisition.width = 0;
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child_requisition.height = 0;
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if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
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gtk_widget_size_request (bin->child, &child_requisition);
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requisition->width = GTK_CONTAINER (widget)->border_width * 2 + child_requisition.width + 10;
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requisition->height = GTK_CONTAINER (widget)->border_width * 2 + child_requisition.height * 2 + 10;
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}
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static void
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gtk_mirror_bin_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation)
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{
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GtkMirrorBin *bin = GTK_MIRROR_BIN (widget);
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gint border_width;
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gint w, h;
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widget->allocation = *allocation;
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border_width = GTK_CONTAINER (widget)->border_width;
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w = allocation->width - border_width * 2;
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h = allocation->height - border_width * 2;
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if (GTK_WIDGET_REALIZED (widget))
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gdk_window_move_resize (widget->window,
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allocation->x + border_width,
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allocation->y + border_width,
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w, h);
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if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
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||||||
|
{
|
||||||
|
GtkRequisition child_requisition;
|
||||||
|
GtkAllocation child_allocation;
|
||||||
|
|
||||||
|
gtk_widget_get_child_requisition (bin->child, &child_requisition);
|
||||||
|
child_allocation.x = 0;
|
||||||
|
child_allocation.y = 0;
|
||||||
|
child_allocation.height = child_requisition.height;
|
||||||
|
child_allocation.width = child_requisition.width;
|
||||||
|
|
||||||
|
if (GTK_WIDGET_REALIZED (widget))
|
||||||
|
gdk_window_move_resize (bin->offscreen_window,
|
||||||
|
allocation->x + border_width,
|
||||||
|
allocation->y + border_width,
|
||||||
|
child_allocation.width, child_allocation.height);
|
||||||
|
gtk_widget_size_allocate (bin->child, &child_allocation);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static gboolean
|
||||||
|
gtk_mirror_bin_damage (GtkWidget *widget,
|
||||||
|
GdkEventExpose *event)
|
||||||
|
{
|
||||||
|
gdk_window_invalidate_rect (widget->window, NULL, FALSE);
|
||||||
|
|
||||||
|
return TRUE;
|
||||||
|
}
|
||||||
|
|
||||||
|
static gboolean
|
||||||
|
gtk_mirror_bin_expose (GtkWidget *widget,
|
||||||
|
GdkEventExpose *event)
|
||||||
|
{
|
||||||
|
GtkMirrorBin *bin = GTK_MIRROR_BIN (widget);
|
||||||
|
gint width, height;
|
||||||
|
|
||||||
|
if (GTK_WIDGET_DRAWABLE (widget))
|
||||||
|
{
|
||||||
|
if (event->window == widget->window)
|
||||||
|
{
|
||||||
|
GdkPixmap *pixmap;
|
||||||
|
GtkAllocation child_area;
|
||||||
|
cairo_t *cr;
|
||||||
|
cairo_matrix_t matrix;
|
||||||
|
cairo_pattern_t *mask;
|
||||||
|
|
||||||
|
if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
|
||||||
|
{
|
||||||
|
pixmap = gdk_offscreen_window_get_pixmap (bin->offscreen_window);
|
||||||
|
gdk_drawable_get_size (pixmap, &width, &height);
|
||||||
|
child_area = bin->child->allocation;
|
||||||
|
|
||||||
|
cr = gdk_cairo_create (widget->window);
|
||||||
|
|
||||||
|
cairo_save (cr);
|
||||||
|
|
||||||
|
cairo_rectangle (cr, 0, 0, width, height);
|
||||||
|
cairo_clip (cr);
|
||||||
|
|
||||||
|
/* paint the offscreen child */
|
||||||
|
gdk_cairo_set_source_pixmap (cr, pixmap, 0, 0);
|
||||||
|
cairo_paint (cr);
|
||||||
|
|
||||||
|
cairo_restore (cr);
|
||||||
|
|
||||||
|
cairo_matrix_init (&matrix, 1.0, 0.0, 0.3, 1.0, 0.0, 0.0);
|
||||||
|
cairo_matrix_scale (&matrix, 1.0, -1.0);
|
||||||
|
cairo_matrix_translate (&matrix, -10, - 3 * height - 10);
|
||||||
|
cairo_transform (cr, &matrix);
|
||||||
|
|
||||||
|
cairo_rectangle (cr, 0, height, width, height);
|
||||||
|
cairo_clip (cr);
|
||||||
|
|
||||||
|
gdk_cairo_set_source_pixmap (cr, pixmap, 0, height);
|
||||||
|
|
||||||
|
/* create linear gradient as mask-pattern to fade out the source */
|
||||||
|
mask = cairo_pattern_create_linear (0.0, height, 0.0, 2*height);
|
||||||
|
cairo_pattern_add_color_stop_rgba (mask, 0.0, 0.0, 0.0, 0.0, 0.0);
|
||||||
|
cairo_pattern_add_color_stop_rgba (mask, 0.25, 0.0, 0.0, 0.0, 0.01);
|
||||||
|
cairo_pattern_add_color_stop_rgba (mask, 0.5, 0.0, 0.0, 0.0, 0.25);
|
||||||
|
cairo_pattern_add_color_stop_rgba (mask, 0.75, 0.0, 0.0, 0.0, 0.5);
|
||||||
|
cairo_pattern_add_color_stop_rgba (mask, 1.0, 0.0, 0.0, 0.0, 1.0);
|
||||||
|
|
||||||
|
/* paint the reflection */
|
||||||
|
cairo_mask (cr, mask);
|
||||||
|
|
||||||
|
cairo_pattern_destroy (mask);
|
||||||
|
cairo_destroy (cr);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
else if (event->window == bin->offscreen_window)
|
||||||
|
{
|
||||||
|
gtk_paint_flat_box (widget->style, event->window,
|
||||||
|
GTK_STATE_NORMAL, GTK_SHADOW_NONE,
|
||||||
|
&event->area, widget, "blah",
|
||||||
|
0, 0, -1, -1);
|
||||||
|
|
||||||
|
if (bin->child)
|
||||||
|
gtk_container_propagate_expose (GTK_CONTAINER (widget),
|
||||||
|
bin->child,
|
||||||
|
event);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return FALSE;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*** ***/
|
||||||
|
|
||||||
|
static GtkWidget *window = NULL;
|
||||||
|
|
||||||
|
GtkWidget *
|
||||||
|
do_offscreen_window2 (GtkWidget *do_widget)
|
||||||
|
{
|
||||||
|
if (!window)
|
||||||
|
{
|
||||||
|
GtkWidget *bin, *vbox;
|
||||||
|
GtkWidget *hbox, *entry, *applybutton, *backbutton;
|
||||||
|
GtkSizeGroup *group;
|
||||||
|
|
||||||
|
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
|
||||||
|
gtk_window_set_screen (GTK_WINDOW (window),
|
||||||
|
gtk_widget_get_screen (do_widget));
|
||||||
|
gtk_window_set_title (GTK_WINDOW (window), "Effects");
|
||||||
|
|
||||||
|
g_signal_connect (window, "destroy",
|
||||||
|
G_CALLBACK (gtk_widget_destroyed), &window);
|
||||||
|
|
||||||
|
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
|
||||||
|
|
||||||
|
vbox = gtk_vbox_new (0, FALSE);
|
||||||
|
|
||||||
|
bin = gtk_mirror_bin_new ();
|
||||||
|
|
||||||
|
group = gtk_size_group_new (GTK_SIZE_GROUP_VERTICAL);
|
||||||
|
|
||||||
|
hbox = gtk_hbox_new (FALSE, 6);
|
||||||
|
backbutton = gtk_button_new ();
|
||||||
|
gtk_container_add (GTK_CONTAINER (backbutton),
|
||||||
|
gtk_image_new_from_stock (GTK_STOCK_GO_BACK, 4));
|
||||||
|
gtk_size_group_add_widget (group, backbutton);
|
||||||
|
entry = gtk_entry_new ();
|
||||||
|
gtk_size_group_add_widget (group, entry);
|
||||||
|
applybutton = gtk_button_new ();
|
||||||
|
gtk_size_group_add_widget (group, applybutton);
|
||||||
|
gtk_container_add (GTK_CONTAINER (applybutton),
|
||||||
|
gtk_image_new_from_stock (GTK_STOCK_APPLY, 4));
|
||||||
|
|
||||||
|
gtk_container_add (GTK_CONTAINER (window), vbox);
|
||||||
|
gtk_box_pack_start (GTK_BOX (vbox), bin, TRUE, TRUE, 0);
|
||||||
|
gtk_container_add (GTK_CONTAINER (bin), hbox);
|
||||||
|
gtk_box_pack_start (GTK_BOX (hbox), backbutton, FALSE, FALSE, 0);
|
||||||
|
gtk_box_pack_start (GTK_BOX (hbox), entry, TRUE, TRUE, 0);
|
||||||
|
gtk_box_pack_start (GTK_BOX (hbox), applybutton, FALSE, FALSE, 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!GTK_WIDGET_VISIBLE (window))
|
||||||
|
gtk_widget_show_all (window);
|
||||||
|
else
|
||||||
|
{
|
||||||
|
gtk_widget_destroy (window);
|
||||||
|
window = NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
return window;
|
||||||
|
}
|
||||||
|
|
||||||
Loading…
Reference in New Issue
Block a user