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/* 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 from touchscreens.
*/
#include <gtkmm.h>
class Example_Gestures : public Gtk::Window
{
public:
Example_Gestures();
~Example_Gestures() override;
protected:
// Signal handlers:
bool on_drawing_area_draw(const ::Cairo::RefPtr< ::Cairo::Context>& cr);
void on_gesture_swipe_swipe(double velocity_x, double velocity_y);
void on_gesture_long_press_pressed(double x, double y);
void on_gesture_long_press_end(GdkEventSequence* sequence);
void on_gesture_rotate_angle_changed(double angle, double angle_delta);
void on_gesture_zoom_scale_changed(double scale);
// Child widget:
Gtk::DrawingArea m_DrawingArea;
// Gestures:
Glib::RefPtr<Gtk::GestureSwipe> m_GestureSwipe;
Glib::RefPtr<Gtk::GestureLongPress> m_GestureLongPress;
Glib::RefPtr<Gtk::GestureRotate> m_GestureRotate;
Glib::RefPtr<Gtk::GestureZoom> m_GestureZoom;
double m_swipe_x;
double m_swipe_y;
bool m_long_pressed;
};
Gtk::Window* do_gestures()
{
return new Example_Gestures();
}
Example_Gestures::Example_Gestures()
:
m_DrawingArea(),
m_swipe_x(0.0), m_swipe_y(0.0), m_long_pressed(false)
{
set_title("Gestures demo");
set_default_size(400, 400);
add(m_DrawingArea);
m_DrawingArea.add_events(Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK |
Gdk::POINTER_MOTION_MASK | Gdk::TOUCH_MASK);
m_DrawingArea.signal_draw().connect(sigc::mem_fun(*this, &Example_Gestures::on_drawing_area_draw));
// Create gestures.
m_GestureSwipe = Gtk::GestureSwipe::create(m_DrawingArea);
m_GestureSwipe->set_propagation_phase(Gtk::PHASE_BUBBLE);
m_GestureSwipe->signal_swipe().connect(sigc::mem_fun(*this, &Example_Gestures::on_gesture_swipe_swipe));
m_GestureSwipe->set_touch_only(false);
m_GestureLongPress = Gtk::GestureLongPress::create(m_DrawingArea);
m_GestureLongPress->set_propagation_phase(Gtk::PHASE_BUBBLE);
m_GestureLongPress->signal_pressed().connect(sigc::mem_fun(*this, &Example_Gestures::on_gesture_long_press_pressed));
m_GestureLongPress->signal_end().connect(sigc::mem_fun(*this, &Example_Gestures::on_gesture_long_press_end));
m_GestureLongPress->set_touch_only(false);
m_GestureRotate = Gtk::GestureRotate::create(m_DrawingArea);
m_GestureRotate->set_propagation_phase(Gtk::PHASE_BUBBLE);
m_GestureRotate->signal_angle_changed().connect(sigc::mem_fun(*this, &Example_Gestures::on_gesture_rotate_angle_changed));
m_GestureZoom = Gtk::GestureZoom::create(m_DrawingArea);
m_GestureZoom->set_propagation_phase(Gtk::PHASE_BUBBLE);
m_GestureZoom->signal_scale_changed().connect(sigc::mem_fun(*this, &Example_Gestures::on_gesture_zoom_scale_changed));
show_all();
}
Example_Gestures::~Example_Gestures()
{
}
bool Example_Gestures::on_drawing_area_draw(const ::Cairo::RefPtr< ::Cairo::Context>& cr)
{
Gtk::Allocation allocation = m_DrawingArea.get_allocation();
// Coordinates for the center of the window
const int xc = allocation.get_width() / 2;
const int yc = allocation.get_height() / 2;
if (m_GestureRotate->is_recognized() || m_GestureZoom->is_recognized())
{
Cairo::Matrix matrix = Cairo::translation_matrix(xc, yc);
cr->save();
const double angle = m_GestureRotate->get_angle_delta();
matrix.rotate(angle);
const double scale = m_GestureZoom->get_scale_delta();
matrix.scale(scale, scale);
cr->set_matrix(matrix);
cr->rectangle(-100, -100, 200, 200);
::Cairo::RefPtr<Cairo::LinearGradient> pattern = Cairo::LinearGradient::create(-100, 0, 200, 0);
pattern->add_color_stop_rgb(0, 0, 0, 1);
pattern->add_color_stop_rgb(1, 1, 0, 0);
cr->set_source(pattern);
cr->fill();
cr->restore();
}
if (m_swipe_x != 0.0 || m_swipe_y != 0.0)
{
cr->save();
cr->set_line_width(6);
cr->move_to(xc, yc);
cr->rel_line_to(m_swipe_x, m_swipe_y);
cr->set_source_rgba(1.0, 0.0, 0.0, 0.5);
cr->stroke();
cr->restore();
}
if (m_long_pressed)
{
cr->save();
cr->arc(xc, yc, 50, 0, 2 * G_PI);
cr->set_source_rgba(0.0, 1.0, 0.0, 0.5);
cr->stroke();
cr->restore();
}
return true;
}
void Example_Gestures::on_gesture_swipe_swipe(double velocity_x, double velocity_y)
{
m_swipe_x = 0.2 * velocity_x;
m_swipe_y = 0.2 * velocity_y;
m_DrawingArea.queue_draw();
}
void Example_Gestures::on_gesture_long_press_pressed(double /* x */, double /* y */)
{
m_long_pressed = true;
m_DrawingArea.queue_draw();
}
void Example_Gestures::on_gesture_long_press_end(GdkEventSequence* /* sequence */)
{
m_long_pressed = false;
m_DrawingArea.queue_draw();
}
void Example_Gestures::on_gesture_rotate_angle_changed(double /* angle */, double /* angle_delta */)
{
m_DrawingArea.queue_draw();
}
void Example_Gestures::on_gesture_zoom_scale_changed(double /* scale */)
{
m_DrawingArea.queue_draw();
}
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