/* Gestures * * Perform gestures on touchscreens and other input devices. This * demo reacts to long presses and swipes from all devices, plus * multi-touch rotate and zoom gestures. */ #include static GtkGesture *rotate = NULL; static GtkGesture *zoom = NULL; static gdouble swipe_x = 0; static gdouble swipe_y = 0; static gboolean long_pressed = FALSE; static gboolean touchpad_swipe_gesture_begin (GtkGesture *gesture, GdkEventSequence *sequence, GtkWidget *widget) { /* Disallow touchscreen events here */ if (sequence != NULL) gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_DENIED); return sequence == NULL; } static void swipe_gesture_swept (GtkGestureSwipe *gesture, gdouble velocity_x, gdouble velocity_y, GtkWidget *widget) { swipe_x = velocity_x / 10; swipe_y = velocity_y / 10; gtk_widget_queue_draw (widget); } static void long_press_gesture_pressed (GtkGestureLongPress *gesture, gdouble x, gdouble y, GtkWidget *widget) { long_pressed = TRUE; gtk_widget_queue_draw (widget); } static void long_press_gesture_end (GtkGesture *gesture, GdkEventSequence *sequence, GtkWidget *widget) { long_pressed = FALSE; gtk_widget_queue_draw (widget); } static void rotation_angle_changed (GtkGestureRotate *gesture, gdouble angle, gdouble delta, GtkWidget *widget) { gtk_widget_queue_draw (widget); } static void zoom_scale_changed (GtkGestureZoom *gesture, gdouble scale, GtkWidget *widget) { gtk_widget_queue_draw (widget); } static gboolean drawing_area_draw (GtkWidget *widget, cairo_t *cr) { GtkAllocation allocation; gtk_widget_get_allocation (widget, &allocation); if (swipe_x != 0 || swipe_y != 0) { cairo_save (cr); cairo_set_line_width (cr, 6); cairo_move_to (cr, allocation.width / 2, allocation.height / 2); cairo_rel_line_to (cr, swipe_x, swipe_y); cairo_set_source_rgba (cr, 1, 0, 0, 0.5); cairo_stroke (cr); cairo_restore (cr); } if (gtk_gesture_is_recognized (rotate) || gtk_gesture_is_recognized (zoom)) { cairo_pattern_t *pat; cairo_matrix_t matrix; gdouble angle, scale; gdouble x_center, y_center; gtk_gesture_get_bounding_box_center (GTK_GESTURE (zoom), &x_center, &y_center); cairo_get_matrix (cr, &matrix); cairo_matrix_translate (&matrix, x_center, y_center); cairo_save (cr); angle = gtk_gesture_rotate_get_angle_delta (GTK_GESTURE_ROTATE (rotate)); cairo_matrix_rotate (&matrix, angle); scale = gtk_gesture_zoom_get_scale_delta (GTK_GESTURE_ZOOM (zoom)); cairo_matrix_scale (&matrix, scale, scale); cairo_set_matrix (cr, &matrix); cairo_rectangle (cr, -100, -100, 200, 200); pat = cairo_pattern_create_linear (-100, 0, 200, 0); cairo_pattern_add_color_stop_rgb (pat, 0, 0, 0, 1); cairo_pattern_add_color_stop_rgb (pat, 1, 1, 0, 0); cairo_set_source (cr, pat); cairo_fill (cr); cairo_restore (cr); cairo_pattern_destroy (pat); } if (long_pressed) { cairo_save (cr); cairo_arc (cr, allocation.width / 2, allocation.height / 2, 50, 0, 2 * G_PI); cairo_set_source_rgba (cr, 0, 1, 0, 0.5); cairo_stroke (cr); cairo_restore (cr); } return TRUE; } GtkWidget * do_gestures (GtkWidget *do_widget) { static GtkWidget *window = NULL; GtkWidget *drawing_area; GtkGesture *gesture; if (!window) { window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_default_size (GTK_WINDOW (window), 400, 400); gtk_window_set_title (GTK_WINDOW (window), "Gestures"); g_signal_connect (window, "destroy", G_CALLBACK (gtk_widget_destroyed), &window); drawing_area = gtk_drawing_area_new (); gtk_container_add (GTK_CONTAINER (window), drawing_area); gtk_widget_add_events (drawing_area, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_TOUCH_MASK); g_signal_connect (drawing_area, "draw", G_CALLBACK (drawing_area_draw), NULL); /* Swipe */ gesture = gtk_gesture_swipe_new (drawing_area); g_signal_connect (gesture, "swipe", G_CALLBACK (swipe_gesture_swept), drawing_area); gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (gesture), GTK_PHASE_BUBBLE); g_object_weak_ref (G_OBJECT (drawing_area), (GWeakNotify) g_object_unref, gesture); /* 3fg swipe for touchpads */ gesture = g_object_new (GTK_TYPE_GESTURE_SWIPE, "widget", drawing_area, "n-points", 3, NULL); g_signal_connect (gesture, "begin", G_CALLBACK (touchpad_swipe_gesture_begin), drawing_area); g_signal_connect (gesture, "swipe", G_CALLBACK (swipe_gesture_swept), drawing_area); gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (gesture), GTK_PHASE_BUBBLE); g_object_weak_ref (G_OBJECT (drawing_area), (GWeakNotify) g_object_unref, gesture); /* Long press */ gesture = gtk_gesture_long_press_new (drawing_area); g_signal_connect (gesture, "pressed", G_CALLBACK (long_press_gesture_pressed), drawing_area); g_signal_connect (gesture, "end", G_CALLBACK (long_press_gesture_end), drawing_area); gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (gesture), GTK_PHASE_BUBBLE); g_object_weak_ref (G_OBJECT (drawing_area), (GWeakNotify) g_object_unref, gesture); /* Rotate */ rotate = gesture = gtk_gesture_rotate_new (drawing_area); g_signal_connect (gesture, "angle-changed", G_CALLBACK (rotation_angle_changed), drawing_area); gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (gesture), GTK_PHASE_BUBBLE); g_object_weak_ref (G_OBJECT (drawing_area), (GWeakNotify) g_object_unref, gesture); /* Zoom */ zoom = gesture = gtk_gesture_zoom_new (drawing_area); g_signal_connect (gesture, "scale-changed", G_CALLBACK (zoom_scale_changed), drawing_area); gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (gesture), GTK_PHASE_BUBBLE); g_object_weak_ref (G_OBJECT (drawing_area), (GWeakNotify) g_object_unref, gesture); } if (!gtk_widget_get_visible (window)) gtk_widget_show_all (window); else gtk_widget_destroy (window); return window; }