[gtk+/gestures: 10/202] gtk-demo: Add simple gestures demo
- From: Carlos Garnacho <carlosg src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/gestures: 10/202] gtk-demo: Add simple gestures demo
- Date: Fri, 23 May 2014 17:57:12 +0000 (UTC)
commit 71e382cf42e631cbd2739b0b74a5837064cf7de3
Author: Carlos Garnacho <carlosg gnome org>
Date: Thu Jan 17 21:12:39 2013 +0100
gtk-demo: Add simple gestures demo
demos/gtk-demo/Makefile.am | 1 +
demos/gtk-demo/demo.gresource.xml | 1 +
demos/gtk-demo/gestures.c | 195 +++++++++++++++++++++++++++++++++++++
3 files changed, 197 insertions(+), 0 deletions(-)
---
diff --git a/demos/gtk-demo/Makefile.am b/demos/gtk-demo/Makefile.am
index 89a25dc..62cd333 100644
--- a/demos/gtk-demo/Makefile.am
+++ b/demos/gtk-demo/Makefile.am
@@ -24,6 +24,7 @@ demos = \
entry_completion.c \
event_axes.c \
expander.c \
+ gestures.c \
headerbar.c \
hypertext.c \
iconview.c \
diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml
index 76bb304..4f90eb4 100644
--- a/demos/gtk-demo/demo.gresource.xml
+++ b/demos/gtk-demo/demo.gresource.xml
@@ -94,6 +94,7 @@
<file>event_axes.c</file>
<file>expander.c</file>
<file>flowbox.c</file>
+ <file>gestures.c</file>
<file>headerbar.c</file>
<file>hypertext.c</file>
<file>iconview.c</file>
diff --git a/demos/gtk-demo/gestures.c b/demos/gtk-demo/gestures.c
new file mode 100644
index 0000000..b9759c0
--- /dev/null
+++ b/demos/gtk-demo/gestures.c
@@ -0,0 +1,195 @@
+/* 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 <gtk/gtk.h>
+
+static GtkWidget *window = NULL;
+static GtkGesture *rotate = NULL;
+static GtkGesture *zoom = NULL;
+static gdouble swipe_x = 0;
+static gdouble swipe_y = 0;
+static gboolean long_pressed = FALSE;
+
+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;
+
+ cairo_matrix_init_translate (&matrix,
+ allocation.width / 2,
+ allocation.height / 2);
+
+ cairo_save (cr);
+
+ if (gtk_gesture_rotate_get_angle_delta (GTK_GESTURE_ROTATE (rotate), &angle))
+ cairo_matrix_rotate (&matrix, angle);
+
+ if (gtk_gesture_zoom_get_scale_delta (GTK_GESTURE_ZOOM (zoom), &scale))
+ 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)
+{
+ 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 demo");
+ 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_widget_add_controller (drawing_area, GTK_EVENT_CONTROLLER (gesture),
+ GTK_PHASE_BUBBLE);
+
+ /* 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_widget_add_controller (drawing_area, GTK_EVENT_CONTROLLER (gesture),
+ GTK_PHASE_BUBBLE);
+
+ /* Rotate */
+ rotate = gesture = gtk_gesture_rotate_new (drawing_area);
+ g_signal_connect (gesture, "angle-changed",
+ G_CALLBACK (rotation_angle_changed), drawing_area);
+ gtk_widget_add_controller (drawing_area, GTK_EVENT_CONTROLLER (gesture),
+ GTK_PHASE_BUBBLE);
+
+ /* Zoom */
+ zoom = gesture = gtk_gesture_zoom_new (drawing_area);
+ g_signal_connect (gesture, "scale-changed",
+ G_CALLBACK (zoom_scale_changed), drawing_area);
+ gtk_widget_add_controller (drawing_area, GTK_EVENT_CONTROLLER (gesture),
+ GTK_PHASE_BUBBLE);
+ }
+
+ if (!gtk_widget_get_visible (window))
+ gtk_widget_show_all (window);
+ else
+ {
+ gtk_widget_destroy (window);
+ window = NULL;
+ }
+
+ return window;
+}
[
Date Prev][
Date Next] [
Thread Prev][
Thread Next]
[
Thread Index]
[
Date Index]
[
Author Index]