source/input/windows/touchscreen.cpp

   1 #define _WIN32_WINNT 0x0601
   2 #include <windows.h>
   3 #include <msp/graphics/window_private.h>
   4 #include "touchscreen.h"
   5
   6 using namespace std;
   7
   8 namespace Msp {
   9 namespace Input {
  10
  11 void Touchscreen::input_event(const Graphics::Window::Event &event)
  12 {
  13         if(event.msg==WM_TOUCHMOVE)
  14         {
  15                 HTOUCHINPUT handle = reinterpret_cast<HTOUCHINPUT>(event.lparam);
  16                 unsigned n_points = LOWORD(event.wparam);
  17                 /* If I ever invent a legitimate use case for more touch points than an
  18                 average human has fingers, I'll come up with something else here. */
  19                 TOUCHINPUT touch_buffer[10];
  20                 if(!GetTouchInputInfo(handle, 10, touch_buffer, sizeof(TOUCHINPUT)))
  21                         return;
  22
  23                 for(unsigned i=0; i<n_points; ++i)
  24                 {
  25                         const TOUCHINPUT &point = touch_buffer[i];
  26
  27                         POINT screen_pt = { point.x/100, point.y/100 };
  28                         POINT client_pt = screen_pt;
  29                         ScreenToClient(window.get_private().window, &client_pt);
  30                         float x = (point.x/100.0f-screen_pt.x+client_pt.x)*2.0f/window.get_width()-1.0f;
  31                         float y = 1.0f-(point.y/100.0f-screen_pt.y+client_pt.y)*2.0f/window.get_height();
  32
  33                         touch_move(point.dwID, x, y);
  34                         if(point.dwFlags&TOUCHEVENTF_DOWN)
  35                                 touch_down(point.dwID);
  36                         else if(point.dwFlags&TOUCHEVENTF_UP)
  37                                 touch_up(point.dwID);
  38                 }
  39
  40                 CloseTouchInputHandle(handle);
  41         }
  42 }
  43
  44
  45
  46 } // namespace Input
  47 } // namespace Msp