first commit

libraries/M5Unified/examples/Basic/Touch/DragDrop/DragDrop.ino

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+#include <M5Unified.h>
+
+struct box_t
+{
+  int x;
+  int y;
+  int w;
+  int h;
+  std::uint16_t color;
+  int touch_id = -1;
+
+  void clear(void)
+  {
+    M5.Display.setColor(M5.Display.getBaseColor());
+    for (int i = 0; i < 8; ++i)
+    {
+      M5.Display.drawRect(x+i, y+i, w-i*2, h-i*2);
+    }
+  }
+  void draw(void)
+  {
+    M5.Display.setColor(color);
+    int ie = touch_id < 0 ? 4 : 8;
+    for (int i = 0; i < ie; ++i)
+    {
+      M5.Display.drawRect(x+i, y+i, w-i*2, h-i*2);
+    }
+  }
+  bool contain(int x, int y)
+  {
+    return this->x <= x && x < (this->x + this->w)
+        && this->y <= y && y < (this->y + this->h);
+  }
+};
+
+static constexpr std::size_t box_count = 4;
+static box_t box_list[box_count];
+
+void setup(void)
+{
+  M5.begin();
+
+  for (std::size_t i = 0; i < box_count; ++i)
+  {
+    box_list[i].w = 100;
+    box_list[i].h = 100;
+  }
+  box_list[0].x = 0;
+  box_list[0].y = 0;
+  box_list[1].x = M5.Display.width()  - box_list[1].w;
+  box_list[1].y = 0;
+  box_list[2].x = 0;
+  box_list[2].y = M5.Display.height() - box_list[2].h;
+  box_list[3].x = M5.Display.width()  - box_list[3].w;
+  box_list[3].y = M5.Display.height() - box_list[3].h;
+  box_list[0].color = TFT_RED;
+  box_list[1].color = TFT_BLUE;
+  box_list[2].color = TFT_GREEN;
+  box_list[3].color = TFT_YELLOW;
+
+  M5.Display.setEpdMode(epd_mode_t::epd_fastest);
+  M5.Display.startWrite();
+  M5.Display.setTextSize(2);
+  for (std::size_t i = 0; i < box_count; ++i)
+  {
+    box_list[i].draw();
+  }
+}
+
+void loop(void)
+{
+  M5.delay(1);
+
+  M5.update();
+
+  auto count = M5.Touch.getCount();
+  if (!count)
+  {
+    return;
+  }
+
+  static m5::touch_state_t prev_state;
+  auto t = M5.Touch.getDetail();
+  if (prev_state != t.state)
+  {
+    prev_state = t.state;
+    static constexpr const char* state_name[16] =
+    { "none"
+    , "touch" 
+    , "touch_end" 
+    , "touch_begin" 
+    , "___" 
+    , "hold" 
+    , "hold_end" 
+    , "hold_begin" 
+    , "___" 
+    , "flick"
+    , "flick_end"
+    , "flick_begin"
+    , "___"
+    , "drag"
+    , "drag_end"
+    , "drag_begin"
+    };
+    M5_LOGI("%s", state_name[t.state]);
+  }
+
+  for (std::size_t i = 0; i < count; ++i)
+  {
+    auto t = M5.Touch.getDetail(i);
+
+    for (std::size_t j = 0; j < box_count; ++j)
+    {
+      if (t.wasHold())
+      {
+        if (box_list[j].contain(t.x, t.y))
+        {
+          box_list[j].touch_id = t.id;
+        }
+      }
+
+      M5.Display.waitDisplay();
+      if (box_list[j].touch_id == t.id)
+      {
+        if (t.wasReleased())
+        {
+          box_list[j].touch_id = -1;
+          box_list[j].clear();
+        }
+        else
+        {
+          auto dx = t.deltaX();
+          auto dy = t.deltaY();
+          if (dx || dy)
+          {
+            box_list[j].clear();
+            box_list[j].x += dx;
+            box_list[j].y += dy;
+          }
+        }
+      }
+      box_list[j].draw();
+    }
+  }
+  M5.Display.display();
+}
+
+#if !defined ( ARDUINO ) && defined ( ESP_PLATFORM )
+extern "C" {
+  void loopTask(void*)
+  {
+    setup();
+    for (;;) {
+      loop();
+    }
+    vTaskDelete(NULL);
+  }
+
+  void app_main()
+  {
+    xTaskCreatePinnedToCore(loopTask, "loopTask", 8192, NULL, 1, NULL, 1);
+  }
+}
+#endif