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gtk/tests/gtkoffscreenbox.c

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/*
* gtkoffscreenbox.c
*/
#include "config.h"
#include <math.h>
#include <gtk/gtk.h>
#include "gtkoffscreenbox.h"
static void gtk_offscreen_box_realize (GtkWidget *widget);
static void gtk_offscreen_box_unrealize (GtkWidget *widget);
static void gtk_offscreen_box_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural);
static void gtk_offscreen_box_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural);
static void gtk_offscreen_box_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gtk_offscreen_box_damage (GtkWidget *widget,
GdkEventExpose *event);
static gboolean gtk_offscreen_box_draw (GtkWidget *widget,
cairo_t *cr);
static void gtk_offscreen_box_add (GtkContainer *container,
GtkWidget *child);
static void gtk_offscreen_box_remove (GtkContainer *container,
GtkWidget *widget);
static void gtk_offscreen_box_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data);
static GType gtk_offscreen_box_child_type (GtkContainer *container);
#define CHILD1_SIZE_SCALE 1.0
#define CHILD2_SIZE_SCALE 1.0
G_DEFINE_TYPE (GtkOffscreenBox, gtk_offscreen_box, GTK_TYPE_CONTAINER);
static void
to_child_2 (GtkOffscreenBox *offscreen_box,
double widget_x, double widget_y,
double *x_out, double *y_out)
{
GtkAllocation child_area;
double x, y, xr, yr;
double cos_angle, sin_angle;
x = widget_x;
y = widget_y;
if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
{
gtk_widget_get_allocation (offscreen_box->child1, &child_area);
y -= child_area.height;
}
gtk_widget_get_allocation (offscreen_box->child2, &child_area);
x -= child_area.width / 2;
y -= child_area.height / 2;
cos_angle = cos (-offscreen_box->angle);
sin_angle = sin (-offscreen_box->angle);
xr = x * cos_angle - y * sin_angle;
yr = x * sin_angle + y * cos_angle;
x = xr;
y = yr;
x += child_area.width / 2;
y += child_area.height / 2;
*x_out = x;
*y_out = y;
}
static void
to_parent_2 (GtkOffscreenBox *offscreen_box,
double offscreen_x, double offscreen_y,
double *x_out, double *y_out)
{
GtkAllocation child_area;
double x, y, xr, yr;
double cos_angle, sin_angle;
gtk_widget_get_allocation (offscreen_box->child2, &child_area);
x = offscreen_x;
y = offscreen_y;
x -= child_area.width / 2;
y -= child_area.height / 2;
cos_angle = cos (offscreen_box->angle);
sin_angle = sin (offscreen_box->angle);
xr = x * cos_angle - y * sin_angle;
yr = x * sin_angle + y * cos_angle;
x = xr;
y = yr;
x += child_area.width / 2;
y += child_area.height / 2;
if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
{
gtk_widget_get_allocation (offscreen_box->child1, &child_area);
y += child_area.height;
}
*x_out = x;
*y_out = y;
}
static void
gtk_offscreen_box_class_init (GtkOffscreenBoxClass *klass)
{
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
widget_class->realize = gtk_offscreen_box_realize;
widget_class->unrealize = gtk_offscreen_box_unrealize;
widget_class->get_preferred_width = gtk_offscreen_box_get_preferred_width;
widget_class->get_preferred_height = gtk_offscreen_box_get_preferred_height;
widget_class->size_allocate = gtk_offscreen_box_size_allocate;
widget_class->draw = gtk_offscreen_box_draw;
g_signal_override_class_closure (g_signal_lookup ("damage-event", GTK_TYPE_WIDGET),
GTK_TYPE_OFFSCREEN_BOX,
g_cclosure_new (G_CALLBACK (gtk_offscreen_box_damage),
NULL, NULL));
container_class->add = gtk_offscreen_box_add;
container_class->remove = gtk_offscreen_box_remove;
container_class->forall = gtk_offscreen_box_forall;
container_class->child_type = gtk_offscreen_box_child_type;
}
static void
gtk_offscreen_box_init (GtkOffscreenBox *offscreen_box)
{
gtk_widget_set_has_window (GTK_WIDGET (offscreen_box), TRUE);
}
GtkWidget *
gtk_offscreen_box_new (void)
{
return g_object_new (GTK_TYPE_OFFSCREEN_BOX, NULL);
}
static GdkWindow *
pick_offscreen_child (GdkWindow *offscreen_window,
double widget_x, double widget_y,
GtkOffscreenBox *offscreen_box)
{
GtkAllocation child_area;
double x, y;
/* First check for child 2 */
if (offscreen_box->child2 &&
gtk_widget_get_visible (offscreen_box->child2))
{
to_child_2 (offscreen_box,
widget_x, widget_y,
&x, &y);
gtk_widget_get_allocation (offscreen_box->child2, &child_area);
if (x >= 0 && x < child_area.width &&
y >= 0 && y < child_area.height)
return offscreen_box->offscreen_window2;
}
if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
{
x = widget_x;
y = widget_y;
gtk_widget_get_allocation (offscreen_box->child1, &child_area);
if (x >= 0 && x < child_area.width &&
y >= 0 && y < child_area.height)
return offscreen_box->offscreen_window1;
}
return NULL;
}
static void
offscreen_window_to_parent1 (GdkWindow *offscreen_window,
double offscreen_x,
double offscreen_y,
double *parent_x,
double *parent_y,
GtkOffscreenBox *offscreen_box)
{
*parent_x = offscreen_x;
*parent_y = offscreen_y;
}
static void
offscreen_window_from_parent1 (GdkWindow *window,
double parent_x,
double parent_y,
double *offscreen_x,
double *offscreen_y,
GtkOffscreenBox *offscreen_box)
{
*offscreen_x = parent_x;
*offscreen_y = parent_y;
}
static void
offscreen_window_to_parent2 (GdkWindow *offscreen_window,
double offscreen_x,
double offscreen_y,
double *parent_x,
double *parent_y,
GtkOffscreenBox *offscreen_box)
{
to_parent_2 (offscreen_box,
offscreen_x, offscreen_y,
parent_x, parent_y);
}
static void
offscreen_window_from_parent2 (GdkWindow *window,
double parent_x,
double parent_y,
double *offscreen_x,
double *offscreen_y,
GtkOffscreenBox *offscreen_box)
{
to_child_2 (offscreen_box,
parent_x, parent_y,
offscreen_x, offscreen_y);
}
static cairo_surface_t *
gdk_offscreen_box_create_alpha_image_surface (GdkWindow *offscreen,
gint width,
gint height)
{
return cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
}
static void
gtk_offscreen_box_realize (GtkWidget *widget)
{
GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (widget);
GtkAllocation allocation, child_area;
GtkStyleContext *context;
GdkWindow *window;
GdkWindowAttr attributes;
gint attributes_mask;
guint border_width;
GtkRequisition child_requisition;
int start_y = 0;
gtk_widget_set_realized (widget, TRUE);
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
gtk_widget_get_allocation (widget, &allocation);
attributes.x = allocation.x + border_width;
attributes.y = allocation.y + border_width;
attributes.width = allocation.width - 2 * border_width;
attributes.height = allocation.height - 2 * border_width;
attributes.window_type = GDK_WINDOW_CHILD;
attributes.event_mask = gtk_widget_get_events (widget)
| GDK_EXPOSURE_MASK
| GDK_POINTER_MOTION_MASK
| GDK_BUTTON_PRESS_MASK
| GDK_BUTTON_RELEASE_MASK
| GDK_SCROLL_MASK
| GDK_ENTER_NOTIFY_MASK
| GDK_LEAVE_NOTIFY_MASK;
attributes.visual = gtk_widget_get_visual (widget);
attributes.wclass = GDK_INPUT_OUTPUT;
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
window = gdk_window_new (gtk_widget_get_parent_window (widget),
&attributes, attributes_mask);
gtk_widget_set_window (widget, window);
gdk_window_set_user_data (window, widget);
g_signal_connect (window, "pick-embedded-child",
G_CALLBACK (pick_offscreen_child), offscreen_box);
attributes.window_type = GDK_WINDOW_OFFSCREEN;
/* Child 1 */
attributes.x = attributes.y = 0;
if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
{
gtk_widget_get_allocation (offscreen_box->child1, &child_area);
attributes.width = child_area.width;
attributes.height = child_area.height;
start_y += child_area.height;
}
offscreen_box->offscreen_window1 = gdk_window_new (gtk_widget_get_root_window (widget),
&attributes, attributes_mask);
gdk_window_set_user_data (offscreen_box->offscreen_window1, widget);
if (offscreen_box->child1)
gtk_widget_set_parent_window (offscreen_box->child1, offscreen_box->offscreen_window1);
gdk_offscreen_window_set_embedder (offscreen_box->offscreen_window1,
window);
g_signal_connect (offscreen_box->offscreen_window1, "to-embedder",
G_CALLBACK (offscreen_window_to_parent1), offscreen_box);
g_signal_connect (offscreen_box->offscreen_window1, "from-embedder",
G_CALLBACK (offscreen_window_from_parent1), offscreen_box);
/* Child 2 */
attributes.y = start_y;
child_requisition.width = child_requisition.height = 0;
if (offscreen_box->child2 && gtk_widget_get_visible (offscreen_box->child2))
{
gtk_widget_get_allocation (offscreen_box->child2, &child_area);
attributes.width = child_area.width;
attributes.height = child_area.height;
}
offscreen_box->offscreen_window2 = gdk_window_new (gtk_widget_get_root_window (widget),
&attributes, attributes_mask);
gdk_window_set_user_data (offscreen_box->offscreen_window2, widget);
if (offscreen_box->child2)
gtk_widget_set_parent_window (offscreen_box->child2, offscreen_box->offscreen_window2);
gdk_offscreen_window_set_embedder (offscreen_box->offscreen_window2,
window);
g_signal_connect (offscreen_box->offscreen_window2, "create-surface",
G_CALLBACK (gdk_offscreen_box_create_alpha_image_surface),
offscreen_box);
g_signal_connect (offscreen_box->offscreen_window2, "to-embedder",
G_CALLBACK (offscreen_window_to_parent2), offscreen_box);
g_signal_connect (offscreen_box->offscreen_window2, "from-embedder",
G_CALLBACK (offscreen_window_from_parent2), offscreen_box);
context = gtk_widget_get_style_context (widget);
gtk_style_context_set_background (context, window);
gtk_style_context_set_background (context, offscreen_box->offscreen_window1);
gtk_style_context_set_background (context, offscreen_box->offscreen_window2);
gdk_window_show (offscreen_box->offscreen_window1);
gdk_window_show (offscreen_box->offscreen_window2);
}
static void
gtk_offscreen_box_unrealize (GtkWidget *widget)
{
GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (widget);
gdk_window_set_user_data (offscreen_box->offscreen_window1, NULL);
gdk_window_destroy (offscreen_box->offscreen_window1);
offscreen_box->offscreen_window1 = NULL;
gdk_window_set_user_data (offscreen_box->offscreen_window2, NULL);
gdk_window_destroy (offscreen_box->offscreen_window2);
offscreen_box->offscreen_window2 = NULL;
GTK_WIDGET_CLASS (gtk_offscreen_box_parent_class)->unrealize (widget);
}
static GType
gtk_offscreen_box_child_type (GtkContainer *container)
{
GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (container);
if (offscreen_box->child1 && offscreen_box->child2)
return G_TYPE_NONE;
return GTK_TYPE_WIDGET;
}
static void
gtk_offscreen_box_add (GtkContainer *container,
GtkWidget *widget)
{
GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (container);
if (!offscreen_box->child1)
gtk_offscreen_box_add1 (offscreen_box, widget);
else if (!offscreen_box->child2)
gtk_offscreen_box_add2 (offscreen_box, widget);
else
g_warning ("GtkOffscreenBox cannot have more than 2 children\n");
}
void
gtk_offscreen_box_add1 (GtkOffscreenBox *offscreen_box,
GtkWidget *child)
{
g_return_if_fail (GTK_IS_OFFSCREEN_BOX (offscreen_box));
g_return_if_fail (GTK_IS_WIDGET (child));
if (offscreen_box->child1 == NULL)
{
gtk_widget_set_parent_window (child, offscreen_box->offscreen_window1);
gtk_widget_set_parent (child, GTK_WIDGET (offscreen_box));
offscreen_box->child1 = child;
}
}
void
gtk_offscreen_box_add2 (GtkOffscreenBox *offscreen_box,
GtkWidget *child)
{
g_return_if_fail (GTK_IS_OFFSCREEN_BOX (offscreen_box));
g_return_if_fail (GTK_IS_WIDGET (child));
if (offscreen_box->child2 == NULL)
{
gtk_widget_set_parent_window (child, offscreen_box->offscreen_window2);
gtk_widget_set_parent (child, GTK_WIDGET (offscreen_box));
offscreen_box->child2 = child;
}
}
static void
gtk_offscreen_box_remove (GtkContainer *container,
GtkWidget *widget)
{
GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (container);
gboolean was_visible;
was_visible = gtk_widget_get_visible (widget);
if (offscreen_box->child1 == widget)
{
gtk_widget_unparent (widget);
offscreen_box->child1 = NULL;
if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
gtk_widget_queue_resize (GTK_WIDGET (container));
}
else if (offscreen_box->child2 == widget)
{
gtk_widget_unparent (widget);
offscreen_box->child2 = NULL;
if (was_visible && gtk_widget_get_visible (GTK_WIDGET (container)))
gtk_widget_queue_resize (GTK_WIDGET (container));
}
}
static void
gtk_offscreen_box_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (container);
g_return_if_fail (callback != NULL);
if (offscreen_box->child1)
(*callback) (offscreen_box->child1, callback_data);
if (offscreen_box->child2)
(*callback) (offscreen_box->child2, callback_data);
}
void
gtk_offscreen_box_set_angle (GtkOffscreenBox *offscreen_box,
gdouble angle)
{
g_return_if_fail (GTK_IS_OFFSCREEN_BOX (offscreen_box));
offscreen_box->angle = angle;
gtk_widget_queue_draw (GTK_WIDGET (offscreen_box));
/* TODO: Really needs to resent pointer events if over the rotated window */
}
static void
gtk_offscreen_box_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (widget);
int w, h;
guint border_width;
w = 0;
h = 0;
if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
{
GtkRequisition child_requisition;
gtk_widget_get_preferred_size ( (offscreen_box->child1),
&child_requisition, NULL);
w = MAX (w, CHILD1_SIZE_SCALE * child_requisition.width);
h += CHILD1_SIZE_SCALE * child_requisition.height;
}
if (offscreen_box->child2 && gtk_widget_get_visible (offscreen_box->child2))
{
GtkRequisition child_requisition;
gtk_widget_get_preferred_size ( (offscreen_box->child2),
&child_requisition, NULL);
w = MAX (w, CHILD2_SIZE_SCALE * child_requisition.width);
h += CHILD2_SIZE_SCALE * child_requisition.height;
}
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
requisition->width = border_width * 2 + w;
requisition->height = border_width * 2 + h;
}
static void
gtk_offscreen_box_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural)
{
GtkRequisition requisition;
gtk_offscreen_box_size_request (widget, &requisition);
*minimum = *natural = requisition.width;
}
static void
gtk_offscreen_box_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural)
{
GtkRequisition requisition;
gtk_offscreen_box_size_request (widget, &requisition);
*minimum = *natural = requisition.height;
}
static void
gtk_offscreen_box_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkOffscreenBox *offscreen_box;
gint start_y;
guint border_width;
offscreen_box = GTK_OFFSCREEN_BOX (widget);
gtk_widget_set_allocation (widget, allocation);
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
if (gtk_widget_get_realized (widget))
gdk_window_move_resize (gtk_widget_get_window (widget),
allocation->x + border_width,
allocation->y + border_width,
allocation->width - border_width * 2,
allocation->height - border_width * 2);
start_y = 0;
if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
{
GtkRequisition child_requisition;
GtkAllocation child_allocation;
gtk_widget_get_preferred_size (offscreen_box->child1,
&child_requisition, NULL);
child_allocation.x = child_requisition.width * (CHILD1_SIZE_SCALE - 1.0) / 2;
child_allocation.y = start_y + child_requisition.height * (CHILD1_SIZE_SCALE - 1.0) / 2;
child_allocation.width = MAX (1, (gint) allocation->width - 2 * border_width);
child_allocation.height = child_requisition.height;
start_y += CHILD1_SIZE_SCALE * child_requisition.height;
if (gtk_widget_get_realized (widget))
gdk_window_move_resize (offscreen_box->offscreen_window1,
child_allocation.x,
child_allocation.y,
child_allocation.width,
child_allocation.height);
child_allocation.x = child_allocation.y = 0;
gtk_widget_size_allocate (offscreen_box->child1, &child_allocation);
}
if (offscreen_box->child2 && gtk_widget_get_visible (offscreen_box->child2))
{
GtkRequisition child_requisition;
GtkAllocation child_allocation;
gtk_widget_get_preferred_size (offscreen_box->child2,
&child_requisition, NULL);
child_allocation.x = child_requisition.width * (CHILD2_SIZE_SCALE - 1.0) / 2;
child_allocation.y = start_y + child_requisition.height * (CHILD2_SIZE_SCALE - 1.0) / 2;
child_allocation.width = MAX (1, (gint) allocation->width - 2 * border_width);
child_allocation.height = child_requisition.height;
start_y += CHILD2_SIZE_SCALE * child_requisition.height;
if (gtk_widget_get_realized (widget))
gdk_window_move_resize (offscreen_box->offscreen_window2,
child_allocation.x,
child_allocation.y,
child_allocation.width,
child_allocation.height);
child_allocation.x = child_allocation.y = 0;
gtk_widget_size_allocate (offscreen_box->child2, &child_allocation);
}
}
static gboolean
gtk_offscreen_box_damage (GtkWidget *widget,
GdkEventExpose *event)
{
gdk_window_invalidate_rect (gtk_widget_get_window (widget),
NULL, FALSE);
return TRUE;
}
static gboolean
gtk_offscreen_box_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkOffscreenBox *offscreen_box = GTK_OFFSCREEN_BOX (widget);
GdkWindow *window;
window = gtk_widget_get_window (widget);
if (gtk_cairo_should_draw_window (cr, window))
{
cairo_surface_t *surface;
GtkAllocation child_area;
if (offscreen_box->child1 && gtk_widget_get_visible (offscreen_box->child1))
{
surface = gdk_offscreen_window_get_surface (offscreen_box->offscreen_window1);
cairo_set_source_surface (cr, surface, 0, 0);
cairo_paint (cr);
gtk_widget_get_allocation (offscreen_box->child1, &child_area);
cairo_translate (cr, 0, child_area.height);
}
if (offscreen_box->child2 && gtk_widget_get_visible (offscreen_box->child2))
{
surface = gdk_offscreen_window_get_surface (offscreen_box->offscreen_window2);
gtk_widget_get_allocation (offscreen_box->child2, &child_area);
/* transform */
cairo_translate (cr, child_area.width / 2, child_area.height / 2);
cairo_rotate (cr, offscreen_box->angle);
cairo_translate (cr, -child_area.width / 2, -child_area.height / 2);
/* paint */
cairo_set_source_surface (cr, surface, 0, 0);
cairo_paint (cr);
}
}
else if (gtk_cairo_should_draw_window (cr, offscreen_box->offscreen_window1))
{
gtk_render_background (gtk_widget_get_style_context (widget), cr,
0, 0,
gdk_window_get_width (offscreen_box->offscreen_window1),
gdk_window_get_height (offscreen_box->offscreen_window1));
if (offscreen_box->child1)
gtk_container_propagate_draw (GTK_CONTAINER (widget),
offscreen_box->child1,
cr);
}
else if (gtk_cairo_should_draw_window (cr, offscreen_box->offscreen_window2))
{
gtk_render_background (gtk_widget_get_style_context (widget), cr,
0, 0,
gdk_window_get_width (offscreen_box->offscreen_window2),
gdk_window_get_height (offscreen_box->offscreen_window2));
if (offscreen_box->child2)
gtk_container_propagate_draw (GTK_CONTAINER (widget),
offscreen_box->child2,
cr);
}
return FALSE;
}
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