mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
#include "demowidget.h"
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#include "demolayout.h"
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/* parent widget */
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struct _DemoWidget
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{
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GtkWidget parent_instance;
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gboolean backward; /* whether we go 0 -> 1 or 1 -> 0 */
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gint64 start_time; /* time the transition started */
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guint tick_id; /* our tick cb */
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};
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struct _DemoWidgetClass
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{
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GtkWidgetClass parent_class;
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};
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G_DEFINE_TYPE (DemoWidget, demo_widget, GTK_TYPE_WIDGET)
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/* The widget is controlling the transition by calling
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* demo_layout_set_position() in a tick callback.
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*
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* We take half a second to go from one layout to the other.
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*/
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#define DURATION (0.5 * G_TIME_SPAN_SECOND)
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static gboolean
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transition (GtkWidget *widget,
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GdkFrameClock *frame_clock,
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gpointer data)
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{
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DemoWidget *self = DEMO_WIDGET (widget);
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DemoLayout *demo_layout = DEMO_LAYOUT (gtk_widget_get_layout_manager (widget));
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gint64 now = g_get_monotonic_time ();
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gtk_widget_queue_allocate (widget);
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if (self->backward)
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demo_layout_set_position (demo_layout, 1.0 - (now - self->start_time) / DURATION);
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else
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demo_layout_set_position (demo_layout, (now - self->start_time) / DURATION);
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if (now - self->start_time >= DURATION)
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{
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self->backward = !self->backward;
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demo_layout_set_position (demo_layout, self->backward ? 1.0 : 0.0);
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/* keep things interesting by shuffling the positions */
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if (!self->backward)
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demo_layout_shuffle (demo_layout);
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self->tick_id = 0;
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return G_SOURCE_REMOVE;
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}
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return G_SOURCE_CONTINUE;
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}
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static void
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clicked (GtkGestureClick *gesture,
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guint n_press,
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double x,
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double y,
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gpointer data)
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{
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DemoWidget *self = data;
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if (self->tick_id != 0)
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return;
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self->start_time = g_get_monotonic_time ();
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self->tick_id = gtk_widget_add_tick_callback (GTK_WIDGET (self), transition, NULL, NULL);
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}
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static void
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demo_widget_init (DemoWidget *self)
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{
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GtkGesture *gesture;
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gesture = gtk_gesture_click_new ();
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g_signal_connect (gesture, "pressed", G_CALLBACK (clicked), self);
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gtk_widget_add_controller (GTK_WIDGET (self), GTK_EVENT_CONTROLLER (gesture));
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}
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static void
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demo_widget_dispose (GObject *object)
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{
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GtkWidget *child;
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while ((child = gtk_widget_get_first_child (GTK_WIDGET (object))))
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gtk_widget_unparent (child);
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G_OBJECT_CLASS (demo_widget_parent_class)->dispose (object);
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}
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static void
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demo_widget_class_init (DemoWidgetClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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object_class->dispose = demo_widget_dispose;
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/* here is where we use our custom layout manager */
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gtk_widget_class_set_layout_manager_type (widget_class, DEMO_TYPE_LAYOUT);
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}
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GtkWidget *
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demo_widget_new (void)
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{
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return g_object_new (DEMO_TYPE_WIDGET, NULL);
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}
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void
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demo_widget_add_child (DemoWidget *self,
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GtkWidget *child)
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{
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gtk_widget_set_parent (child, GTK_WIDGET (self));
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}
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