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#include <math.h>
#include "demo3widget.h"
enum
{
PROP_PAINTABLE = 1,
PROP_SCALE
};
struct _Demo3Widget
{
GtkWidget parent_instance;
GdkPaintable *paintable;
float scale;
GtkWidget *menu;
};
struct _Demo3WidgetClass
{
GtkWidgetClass parent_class;
};
G_DEFINE_TYPE (Demo3Widget, demo3_widget, GTK_TYPE_WIDGET)
static void
demo3_widget_init (Demo3Widget *self)
{
self->scale = 1.f;
gtk_widget_init_template (GTK_WIDGET (self));
}
static void
demo3_widget_dispose (GObject *object)
{
Demo3Widget *self = DEMO3_WIDGET (object);
g_clear_object (&self->paintable);
g_clear_pointer (&self->menu, gtk_widget_unparent);
G_OBJECT_CLASS (demo3_widget_parent_class)->dispose (object);
}
static void
demo3_widget_snapshot (GtkWidget *widget,
GtkSnapshot *snapshot)
{
Demo3Widget *self = DEMO3_WIDGET (widget);
int x, y, width, height;
double w, h;
width = gtk_widget_get_width (widget);
height = gtk_widget_get_height (widget);
w = self->scale * gdk_paintable_get_intrinsic_width (self->paintable);
h = self->scale * gdk_paintable_get_intrinsic_height (self->paintable);
x = MAX (0, (width - ceil (w)) / 2);
y = MAX (0, (height - ceil (h)) / 2);
gtk_snapshot_push_clip (snapshot, &GRAPHENE_RECT_INIT (0, 0, width, height));
gtk_snapshot_save (snapshot);
gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x, y));
gdk_paintable_snapshot (self->paintable, snapshot, w, h);
gtk_snapshot_restore (snapshot);
gtk_snapshot_pop (snapshot);
}
static void
demo3_widget_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
Demo3Widget *self = DEMO3_WIDGET (widget);
int size;
if (orientation == GTK_ORIENTATION_HORIZONTAL)
size = gdk_paintable_get_intrinsic_width (self->paintable);
else
size = gdk_paintable_get_intrinsic_height (self->paintable);
*minimum = *natural = self->scale * size;
}
static void
demo3_widget_size_allocate (GtkWidget *widget,
int width,
int height,
int baseline)
{
Demo3Widget *self = DEMO3_WIDGET (widget);
/* Since we are not using a layout manager (who would do this
* for us), we need to allocate a size for our menu by calling
* gtk_popover_present().
*/
gtk_popover_present (GTK_POPOVER (self->menu));
}
static void
demo3_widget_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
Demo3Widget *self = DEMO3_WIDGET (object);
switch (prop_id)
{
case PROP_PAINTABLE:
g_clear_object (&self->paintable);
self->paintable = g_value_dup_object (value);
gtk_widget_queue_resize (GTK_WIDGET (object));
break;
case PROP_SCALE:
self->scale = g_value_get_float (value);
gtk_widget_queue_resize (GTK_WIDGET (object));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
demo3_widget_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
Demo3Widget *self = DEMO3_WIDGET (object);
switch (prop_id)
{
case PROP_PAINTABLE:
g_value_set_object (value, self->paintable);
break;
case PROP_SCALE:
g_value_set_float (value, self->scale);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
pressed_cb (GtkGestureClick *gesture,
guint n_press,
double x,
double y,
Demo3Widget *self)
{
/* We are placing our menu at the point where
* the click happened, before popping it up.
*/
gtk_popover_set_pointing_to (GTK_POPOVER (self->menu),
&(const GdkRectangle){ x, y, 1, 1 });
gtk_popover_popup (GTK_POPOVER (self->menu));
}
static void
zoom_cb (GtkWidget *widget,
const char *action_name,
GVariant *parameter)
{
Demo3Widget *self = DEMO3_WIDGET (widget);
float scale;
if (g_str_equal (action_name, "zoom.in"))
scale = MIN (10, self->scale * M_SQRT2);
else if (g_str_equal (action_name, "zoom.out"))
scale = MAX (0.01, self->scale / M_SQRT2);
else
scale = 1.0;
gtk_widget_action_set_enabled (widget, "zoom.in", scale < 10);
gtk_widget_action_set_enabled (widget, "zoom.out", scale > 0.01);
gtk_widget_action_set_enabled (widget, "zoom.reset", scale != 1);
g_object_set (widget, "scale", scale, NULL);
}
static void
demo3_widget_class_init (Demo3WidgetClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
object_class->dispose = demo3_widget_dispose;
object_class->set_property = demo3_widget_set_property;
object_class->get_property = demo3_widget_get_property;
widget_class->snapshot = demo3_widget_snapshot;
widget_class->measure = demo3_widget_measure;
widget_class->size_allocate = demo3_widget_size_allocate;
g_object_class_install_property (object_class, PROP_PAINTABLE,
g_param_spec_object ("paintable", "Paintable", "Paintable",
GDK_TYPE_PAINTABLE,
G_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_SCALE,
g_param_spec_float ("scale", "Scale", "Scale",
0.0, 10.0, 1.0,
G_PARAM_READWRITE));
/* These are the actions that we are using in the menu */
gtk_widget_class_install_action (widget_class, "zoom.in", NULL, zoom_cb);
gtk_widget_class_install_action (widget_class, "zoom.out", NULL, zoom_cb);
gtk_widget_class_install_action (widget_class, "zoom.reset", NULL, zoom_cb);
gtk_widget_class_set_template_from_resource (widget_class, "/menu/demo3widget.ui");
gtk_widget_class_bind_template_child (widget_class, Demo3Widget, menu);
gtk_widget_class_bind_template_callback (widget_class, pressed_cb);
}
GtkWidget *
demo3_widget_new (const char *resource)
{
Demo3Widget *self;
GdkPixbuf *pixbuf;
GdkPaintable *paintable;
pixbuf = gdk_pixbuf_new_from_resource (resource, NULL);
paintable = GDK_PAINTABLE (gdk_texture_new_for_pixbuf (pixbuf));
self = g_object_new (DEMO3_TYPE_WIDGET, "paintable", paintable, NULL);
g_object_unref (pixbuf);
g_object_unref (paintable);
return GTK_WIDGET (self);
}
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