2013-01-17 20:12:39 +00:00
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/* Gestures
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*
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* Perform gestures on touchscreens and other input devices. This
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* demo reacts to long presses and swipes from all devices, plus
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* multi-touch rotate and zoom gestures.
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*/
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#include <gtk/gtk.h>
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static GtkWidget *window = NULL;
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static GtkGesture *rotate = NULL;
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static GtkGesture *zoom = NULL;
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static gdouble swipe_x = 0;
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static gdouble swipe_y = 0;
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static gboolean long_pressed = FALSE;
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static void
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swipe_gesture_swept (GtkGestureSwipe *gesture,
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gdouble velocity_x,
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gdouble velocity_y,
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GtkWidget *widget)
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{
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swipe_x = velocity_x / 10;
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swipe_y = velocity_y / 10;
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gtk_widget_queue_draw (widget);
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}
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static void
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long_press_gesture_pressed (GtkGestureLongPress *gesture,
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gdouble x,
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gdouble y,
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GtkWidget *widget)
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{
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long_pressed = TRUE;
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gtk_widget_queue_draw (widget);
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}
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static void
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long_press_gesture_end (GtkGesture *gesture,
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GdkEventSequence *sequence,
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GtkWidget *widget)
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{
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long_pressed = FALSE;
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gtk_widget_queue_draw (widget);
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}
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static void
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rotation_angle_changed (GtkGestureRotate *gesture,
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gdouble angle,
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gdouble delta,
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GtkWidget *widget)
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{
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gtk_widget_queue_draw (widget);
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}
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static void
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zoom_scale_changed (GtkGestureZoom *gesture,
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gdouble scale,
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GtkWidget *widget)
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{
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gtk_widget_queue_draw (widget);
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}
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static gboolean
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drawing_area_draw (GtkWidget *widget,
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cairo_t *cr)
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{
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GtkAllocation allocation;
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gtk_widget_get_allocation (widget, &allocation);
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if (swipe_x != 0 || swipe_y != 0)
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{
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cairo_save (cr);
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cairo_set_line_width (cr, 6);
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cairo_move_to (cr, allocation.width / 2,
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allocation.height / 2);
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cairo_rel_line_to (cr, swipe_x, swipe_y);
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cairo_set_source_rgba (cr, 1, 0, 0, 0.5);
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cairo_stroke (cr);
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cairo_restore (cr);
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}
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if (gtk_gesture_is_recognized (rotate) || gtk_gesture_is_recognized (zoom))
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{
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cairo_pattern_t *pat;
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cairo_matrix_t matrix;
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gdouble angle, scale;
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cairo_matrix_init_translate (&matrix,
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allocation.width / 2,
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allocation.height / 2);
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cairo_save (cr);
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if (gtk_gesture_rotate_get_angle_delta (GTK_GESTURE_ROTATE (rotate), &angle))
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cairo_matrix_rotate (&matrix, angle);
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if (gtk_gesture_zoom_get_scale_delta (GTK_GESTURE_ZOOM (zoom), &scale))
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cairo_matrix_scale (&matrix, scale, scale);
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cairo_set_matrix (cr, &matrix);
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cairo_rectangle (cr, -100, -100, 200, 200);
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pat = cairo_pattern_create_linear (-100, 0, 200, 0);
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cairo_pattern_add_color_stop_rgb (pat, 0, 0, 0, 1);
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cairo_pattern_add_color_stop_rgb (pat, 1, 1, 0, 0);
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cairo_set_source (cr, pat);
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cairo_fill (cr);
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cairo_restore (cr);
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cairo_pattern_destroy (pat);
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}
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if (long_pressed)
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{
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cairo_save (cr);
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cairo_arc (cr, allocation.width / 2,
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allocation.height / 2,
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50, 0, 2 * G_PI);
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cairo_set_source_rgba (cr, 0, 1, 0, 0.5);
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cairo_stroke (cr);
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cairo_restore (cr);
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}
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return TRUE;
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}
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GtkWidget *
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do_gestures (GtkWidget *do_widget)
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{
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GtkWidget *drawing_area;
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GtkGesture *gesture;
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if (!window)
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{
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_default_size (GTK_WINDOW (window), 400, 400);
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gtk_window_set_title (GTK_WINDOW (window), "Gestures demo");
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g_signal_connect (window, "destroy",
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G_CALLBACK (gtk_widget_destroyed), &window);
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drawing_area = gtk_drawing_area_new ();
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gtk_container_add (GTK_CONTAINER (window), drawing_area);
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gtk_widget_add_events (drawing_area,
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GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
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GDK_POINTER_MOTION_MASK | GDK_TOUCH_MASK);
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g_signal_connect (drawing_area, "draw",
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G_CALLBACK (drawing_area_draw), NULL);
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/* Swipe */
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gesture = gtk_gesture_swipe_new (drawing_area);
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g_signal_connect (gesture, "swipe",
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G_CALLBACK (swipe_gesture_swept), drawing_area);
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2014-05-06 13:50:01 +00:00
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gtk_gesture_attach (gesture, GTK_PHASE_BUBBLE);
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2014-04-08 18:59:16 +00:00
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g_object_unref (gesture);
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2013-01-17 20:12:39 +00:00
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/* Long press */
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gesture = gtk_gesture_long_press_new (drawing_area);
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g_signal_connect (gesture, "pressed",
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G_CALLBACK (long_press_gesture_pressed), drawing_area);
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g_signal_connect (gesture, "end",
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G_CALLBACK (long_press_gesture_end), drawing_area);
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2014-05-06 13:50:01 +00:00
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gtk_gesture_attach (gesture, GTK_PHASE_BUBBLE);
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2014-04-08 18:59:16 +00:00
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g_object_unref (gesture);
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2013-01-17 20:12:39 +00:00
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/* Rotate */
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rotate = gesture = gtk_gesture_rotate_new (drawing_area);
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g_signal_connect (gesture, "angle-changed",
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G_CALLBACK (rotation_angle_changed), drawing_area);
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2014-05-06 13:50:01 +00:00
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gtk_gesture_attach (gesture, GTK_PHASE_BUBBLE);
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2014-04-08 18:59:16 +00:00
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g_object_unref (gesture);
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2013-01-17 20:12:39 +00:00
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/* Zoom */
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zoom = gesture = gtk_gesture_zoom_new (drawing_area);
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g_signal_connect (gesture, "scale-changed",
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G_CALLBACK (zoom_scale_changed), drawing_area);
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2014-05-06 13:50:01 +00:00
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gtk_gesture_attach (gesture, GTK_PHASE_BUBBLE);
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2014-04-08 18:59:16 +00:00
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g_object_unref (gesture);
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2013-01-17 20:12:39 +00:00
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}
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if (!gtk_widget_get_visible (window))
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gtk_widget_show_all (window);
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else
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{
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gtk_widget_destroy (window);
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window = NULL;
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}
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return window;
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}
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