593 lines
18 KiB
C
593 lines
18 KiB
C
/* Offscreen windows/Rotated button
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*
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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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*/
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#include <math.h>
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#include <gtk/gtk.h>
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#define GTK_TYPE_ROTATED_BIN (gtk_rotated_bin_get_type ())
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#define GTK_ROTATED_BIN(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTK_TYPE_ROTATED_BIN, GtkRotatedBin))
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#define GTK_ROTATED_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTK_TYPE_ROTATED_BIN, GtkRotatedBinClass))
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#define GTK_IS_ROTATED_BIN(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTK_TYPE_ROTATED_BIN))
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#define GTK_IS_ROTATED_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTK_TYPE_ROTATED_BIN))
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#define GTK_ROTATED_BIN_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTK_TYPE_ROTATED_BIN, GtkRotatedBinClass))
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typedef struct _GtkRotatedBin GtkRotatedBin;
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typedef struct _GtkRotatedBinClass GtkRotatedBinClass;
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struct _GtkRotatedBin
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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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gdouble angle;
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};
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struct _GtkRotatedBinClass
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{
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GtkContainerClass parent_class;
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};
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GType gtk_rotated_bin_get_type (void) G_GNUC_CONST;
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GtkWidget* gtk_rotated_bin_new (void);
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void gtk_rotated_bin_set_angle (GtkRotatedBin *bin,
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gdouble angle);
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/*** implementation ***/
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static void gtk_rotated_bin_realize (GtkWidget *widget);
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static void gtk_rotated_bin_unrealize (GtkWidget *widget);
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static void gtk_rotated_bin_size_request (GtkWidget *widget,
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GtkRequisition *requisition);
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static void gtk_rotated_bin_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation);
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static gboolean gtk_rotated_bin_damage (GtkWidget *widget,
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GdkEventExpose *event);
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static gboolean gtk_rotated_bin_expose (GtkWidget *widget,
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GdkEventExpose *offscreen);
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static void gtk_rotated_bin_add (GtkContainer *container,
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GtkWidget *child);
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static void gtk_rotated_bin_remove (GtkContainer *container,
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GtkWidget *widget);
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static void gtk_rotated_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_rotated_bin_child_type (GtkContainer *container);
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G_DEFINE_TYPE (GtkRotatedBin, gtk_rotated_bin, GTK_TYPE_CONTAINER);
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static void
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to_child (GtkRotatedBin *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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GtkAllocation child_area;
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double x, y, xr, yr;
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double c, s;
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double w, h;
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s = sin (bin->angle);
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c = cos (bin->angle);
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gtk_widget_get_allocation (bin->child, &child_area);
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w = c * child_area.width + s * child_area.height;
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h = s * child_area.width + c * child_area.height;
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x = widget_x;
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y = widget_y;
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x -= (w - child_area.width) / 2;
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y -= (h - child_area.height) / 2;
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x -= child_area.width / 2;
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y -= child_area.height / 2;
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xr = x * c + y * s;
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yr = y * c - x * s;
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x = xr;
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y = yr;
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x += child_area.width / 2;
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y += child_area.height / 2;
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*x_out = x;
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*y_out = y;
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}
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static void
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to_parent (GtkRotatedBin *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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GtkAllocation child_area;
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double x, y, xr, yr;
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double c, s;
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double w, h;
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s = sin (bin->angle);
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c = cos (bin->angle);
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gtk_widget_get_allocation (bin->child, &child_area);
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w = c * child_area.width + s * child_area.height;
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h = s * child_area.width + c * child_area.height;
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x = offscreen_x;
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y = offscreen_y;
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x -= child_area.width / 2;
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y -= child_area.height / 2;
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xr = x * c - y * s;
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yr = x * s + y * c;
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x = xr;
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y = yr;
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x += child_area.width / 2;
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y += child_area.height / 2;
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x -= (w - child_area.width) / 2;
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y -= (h - child_area.height) / 2;
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*x_out = x;
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*y_out = y;
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}
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static void
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gtk_rotated_bin_class_init (GtkRotatedBinClass *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_rotated_bin_realize;
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widget_class->unrealize = gtk_rotated_bin_unrealize;
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widget_class->size_request = gtk_rotated_bin_size_request;
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widget_class->size_allocate = gtk_rotated_bin_size_allocate;
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widget_class->expose_event = gtk_rotated_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_ROTATED_BIN,
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g_cclosure_new (G_CALLBACK (gtk_rotated_bin_damage),
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NULL, NULL));
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container_class->add = gtk_rotated_bin_add;
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container_class->remove = gtk_rotated_bin_remove;
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container_class->forall = gtk_rotated_bin_forall;
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container_class->child_type = gtk_rotated_bin_child_type;
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}
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static void
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gtk_rotated_bin_init (GtkRotatedBin *bin)
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{
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gtk_widget_set_has_window (GTK_WIDGET (bin), TRUE);
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}
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GtkWidget *
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gtk_rotated_bin_new (void)
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{
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return g_object_new (GTK_TYPE_ROTATED_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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GtkRotatedBin *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_get_visible (bin->child))
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{
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to_child (bin, widget_x, widget_y, &x, &y);
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gtk_widget_get_allocation (bin->child, &child_area);
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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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GtkRotatedBin *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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GtkRotatedBin *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_rotated_bin_realize (GtkWidget *widget)
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{
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GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
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GtkAllocation allocation;
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GtkStyle *style;
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GdkWindow *window;
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GdkWindowAttr attributes;
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gint attributes_mask;
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guint border_width;
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GtkRequisition child_requisition;
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gtk_widget_set_realized (widget, TRUE);
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gtk_widget_get_allocation (widget, &allocation);
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border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
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attributes.x = allocation.x + border_width;
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attributes.y = allocation.y + border_width;
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attributes.width = allocation.width - 2 * border_width;
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attributes.height = 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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window = gdk_window_new (gtk_widget_get_parent_window (widget),
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&attributes, attributes_mask);
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gtk_widget_set_window (widget, window);
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gdk_window_set_user_data (window, widget);
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g_signal_connect (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_get_visible (bin->child))
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{
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GtkAllocation child_allocation;
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gtk_widget_get_allocation (bin->child, &child_allocation);
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attributes.width = child_allocation.width;
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attributes.height = 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, 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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gtk_widget_style_attach (widget);
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style = gtk_widget_get_style (widget);
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gtk_style_set_background (style, window, GTK_STATE_NORMAL);
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gtk_style_set_background (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_rotated_bin_unrealize (GtkWidget *widget)
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{
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GtkRotatedBin *bin = GTK_ROTATED_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_rotated_bin_parent_class)->unrealize (widget);
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}
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static GType
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gtk_rotated_bin_child_type (GtkContainer *container)
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{
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GtkRotatedBin *bin = GTK_ROTATED_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_rotated_bin_add (GtkContainer *container,
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GtkWidget *widget)
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{
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GtkRotatedBin *bin = GTK_ROTATED_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 ("GtkRotatedBin cannot have more than one child\n");
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}
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static void
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gtk_rotated_bin_remove (GtkContainer *container,
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GtkWidget *widget)
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{
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GtkRotatedBin *bin = GTK_ROTATED_BIN (container);
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gboolean was_visible;
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was_visible = gtk_widget_get_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_get_visible (GTK_WIDGET (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_rotated_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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GtkRotatedBin *bin = GTK_ROTATED_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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void
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gtk_rotated_bin_set_angle (GtkRotatedBin *bin,
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gdouble angle)
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{
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g_return_if_fail (GTK_IS_ROTATED_BIN (bin));
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bin->angle = angle;
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gtk_widget_queue_resize (GTK_WIDGET (bin));
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gdk_window_geometry_changed (bin->offscreen_window);
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}
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static void
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gtk_rotated_bin_size_request (GtkWidget *widget,
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GtkRequisition *requisition)
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{
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GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
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GtkRequisition child_requisition;
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double s, c;
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double w, h;
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guint border_width;
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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_get_visible (bin->child))
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gtk_widget_size_request (bin->child, &child_requisition);
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s = sin (bin->angle);
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c = cos (bin->angle);
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w = c * child_requisition.width + s * child_requisition.height;
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h = s * child_requisition.width + c * child_requisition.height;
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border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
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requisition->width = border_width * 2 + w;
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requisition->height = border_width * 2 + h;
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}
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static void
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gtk_rotated_bin_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation)
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{
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GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
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guint border_width;
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gint w, h;
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gdouble s, c;
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gtk_widget_set_allocation (widget, allocation);
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border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
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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_get_realized (widget))
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gdk_window_move_resize (gtk_widget_get_window (widget),
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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_get_visible (bin->child))
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{
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GtkRequisition child_requisition;
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GtkAllocation child_allocation;
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s = sin (bin->angle);
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c = cos (bin->angle);
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gtk_widget_get_child_requisition (bin->child, &child_requisition);
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child_allocation.x = 0;
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child_allocation.y = 0;
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child_allocation.height = child_requisition.height;
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if (c == 0.0)
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child_allocation.width = h / s;
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else if (s == 0.0)
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child_allocation.width = w / c;
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else
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child_allocation.width = MIN ((w - s * child_allocation.height) / c,
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(h - c * child_allocation.height) / s);
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if (gtk_widget_get_realized (widget))
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gdk_window_move_resize (bin->offscreen_window,
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child_allocation.x,
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child_allocation.y,
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child_allocation.width,
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child_allocation.height);
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child_allocation.x = child_allocation.y = 0;
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gtk_widget_size_allocate (bin->child, &child_allocation);
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}
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}
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static gboolean
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gtk_rotated_bin_damage (GtkWidget *widget,
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GdkEventExpose *event)
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{
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gdk_window_invalidate_rect (gtk_widget_get_window (widget),
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NULL, FALSE);
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return TRUE;
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}
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static gboolean
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gtk_rotated_bin_expose (GtkWidget *widget,
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GdkEventExpose *event)
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{
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GtkRotatedBin *bin = GTK_ROTATED_BIN (widget);
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GdkWindow *window;
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gint width, height;
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gdouble s, c;
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gdouble w, h;
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if (gtk_widget_is_drawable (widget))
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{
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window = gtk_widget_get_window (widget);
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if (event->window == window)
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{
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GdkPixmap *pixmap;
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GtkAllocation child_area;
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cairo_t *cr;
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if (bin->child && gtk_widget_get_visible (bin->child))
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{
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pixmap = gdk_offscreen_window_get_pixmap (bin->offscreen_window);
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gtk_widget_get_allocation (bin->child, &child_area);
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cr = gdk_cairo_create (window);
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/* transform */
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s = sin (bin->angle);
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c = cos (bin->angle);
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w = c * child_area.width + s * child_area.height;
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h = s * child_area.width + c * child_area.height;
|
|
|
|
cairo_translate (cr, (w - child_area.width) / 2, (h - child_area.height) / 2);
|
|
cairo_translate (cr, child_area.width / 2, child_area.height / 2);
|
|
cairo_rotate (cr, bin->angle);
|
|
cairo_translate (cr, -child_area.width / 2, -child_area.height / 2);
|
|
|
|
/* clip */
|
|
gdk_drawable_get_size (pixmap, &width, &height);
|
|
cairo_rectangle (cr, 0, 0, width, height);
|
|
cairo_clip (cr);
|
|
/* paint */
|
|
gdk_cairo_set_source_pixmap (cr, pixmap, 0, 0);
|
|
cairo_paint (cr);
|
|
|
|
cairo_destroy (cr);
|
|
}
|
|
}
|
|
else if (event->window == bin->offscreen_window)
|
|
{
|
|
gtk_paint_flat_box (gtk_widget_get_style (widget), 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 void
|
|
scale_changed (GtkRange *range,
|
|
GtkRotatedBin *bin)
|
|
{
|
|
gtk_rotated_bin_set_angle (bin, gtk_range_get_value (range));
|
|
}
|
|
|
|
static GtkWidget *window = NULL;
|
|
|
|
GtkWidget *
|
|
do_offscreen_window (GtkWidget *do_widget)
|
|
{
|
|
if (!window)
|
|
{
|
|
GtkWidget *bin, *vbox, *scale, *button;
|
|
GdkColor black;
|
|
|
|
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), "Rotated widget");
|
|
|
|
g_signal_connect (window, "destroy",
|
|
G_CALLBACK (gtk_widget_destroyed), &window);
|
|
|
|
gdk_color_parse ("black", &black);
|
|
gtk_widget_modify_bg (window, GTK_STATE_NORMAL, &black);
|
|
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
|
|
|
|
vbox = gtk_vbox_new (0, FALSE);
|
|
scale = gtk_hscale_new_with_range (0, G_PI/2, 0.01);
|
|
gtk_scale_set_draw_value (GTK_SCALE (scale), FALSE);
|
|
|
|
button = gtk_button_new_with_label ("A Button");
|
|
bin = gtk_rotated_bin_new ();
|
|
|
|
g_signal_connect (scale, "value-changed", G_CALLBACK (scale_changed), bin);
|
|
|
|
gtk_container_add (GTK_CONTAINER (window), vbox);
|
|
gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
|
|
gtk_box_pack_start (GTK_BOX (vbox), bin, TRUE, TRUE, 0);
|
|
gtk_container_add (GTK_CONTAINER (bin), button);
|
|
}
|
|
|
|
if (!gtk_widget_get_visible (window))
|
|
gtk_widget_show_all (window);
|
|
else
|
|
{
|
|
gtk_widget_destroy (window);
|
|
window = NULL;
|
|
}
|
|
|
|
return window;
|
|
}
|
|
|