add tap event on iOS

src/app.h

@@ -220,6 +220,7 @@ public:
     bool gesture_start(const glm::vec2& p0, const glm::vec2& p1);
     bool gesture_move(const glm::vec2& p0, const glm::vec2& p1);
     bool gesture_end();
+    bool touch_tap(const glm::vec2& pos, int fingers, int tap_count);
     bool key_down(kKey key);
     bool key_up(kKey key);
     bool key_char(char key);

src/app_events.cpp

@@ -454,6 +454,18 @@ bool App::gesture_end()
         ret = main->on_event(&e);
     return ret == kEventResult::Consumed;
 }
+bool App::touch_tap(const glm::vec2& pos, int fingers, int tap_count)
+{
+    redraw = true;
+    TouchEvent e;
+    e.m_type = kEventType::TouchTap;
+    e.m_finger_count = fingers;
+    e.m_tap_count = tap_count;
+    kEventResult ret = kEventResult::Available;
+    if (auto* main = layout[main_id])
+        ret = main->on_event(&e);
+    return ret == kEventResult::Consumed;
+}
 bool App::key_down(kKey key)
 {
     if (key == kKey::KeySpacebar && vr_active)

src/event.h

@@ -89,6 +89,7 @@ enum class kEventCategory : uint8_t
     KeyEvent,
     ButtonEvent,
     GestureEvent,
+    TouchEvent,
 };
 
 enum class kEventType : uint8_t
@@ -107,6 +108,7 @@ enum class kEventType : uint8_t
     GestureStart,
     GestureMove,
     GestureEnd,
+    TouchTap,
     KeyDown,
     KeyUp,
     KeyChar,
@@ -158,3 +160,12 @@ public:
     glm::vec2 m_pos;
     glm::vec2 m_pos_delta;
 };
+
+class TouchEvent : public Event
+{
+public:
+    TouchEvent() { m_cat = kEventCategory::TouchEvent; }
+    glm::vec2 m_pos;
+    int m_finger_count;
+    int m_tap_count;
+};

src/node_canvas.cpp

@@ -543,6 +543,7 @@ kEventResult NodeCanvas::handle_event(Event* e)
     MouseEvent* me = static_cast<MouseEvent*>(e);
     KeyEvent* ke = static_cast<KeyEvent*>(e);
     GestureEvent* ge = static_cast<GestureEvent*>(e);
+    TouchEvent* te = static_cast<TouchEvent*>(e);
     auto loc = (me->m_pos - m_pos) * root()->m_zoom;
 
     switch (e->m_type)
@@ -631,6 +632,10 @@ kEventResult NodeCanvas::handle_event(Event* e)
         for (auto& mode : *m_canvas->m_mode)
             mode->on_GestureEvent(ge);
         break;
+    case kEventType::TouchTap:
+        if (te->m_finger_count == 2)
+            ActionManager::undo();
+        break;
     default:
         return kEventResult::Available;
         break;