LRESULT CALLBACK wndproc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
LONG_PTR userdata;
ID2D1HwndRenderTarget *rt = NULL;
WINDOWPOS *wp = (WINDOWPOS *) lParam;
RECT client;
D2D1_SIZE_U size;
userdata = GetWindowLongPtrW(hwnd, GWLP_USERDATA);
if (userdata == 0) {
if (uMsg == WM_CREATE)
SetWindowLongPtrW(hwnd, GWLP_USERDATA, 1);
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}
if (userdata == 1) {
rt = mkRenderTarget(hwnd);
if (rt == NULL) {
PostQuitMessage(1);
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}
SetWindowLongPtrW(hwnd, GWLP_USERDATA, (LONG_PTR) rt);
} else
rt = (ID2D1HwndRenderTarget *) userdata;
switch (uMsg) {
case WM_PAINT:
switch (doPaint(rt)) {
case S_OK:
ValidateRect(hwnd, NULL);
return 0;
case D2DERR_RECREATE_TARGET:
rt->Release();
SetWindowLongPtrW(hwnd, GWLP_USERDATA, 1);
return 0;
}
rt->Release();
PostQuitMessage(1);
break;
case WM_WINDOWPOSCHANGED:
if ((wp->flags & SWP_NOSIZE) != 0)
break;
GetClientRect(hwnd, &client);
size.width = client.right - client.left;
size.height = client.bottom - client.top;
rt->Resize(&size);
InvalidateRect(hwnd, NULL, TRUE);
return 0;
case WM_CLOSE:
rt->Release();
PostQuitMessage(0);
}
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}
void MainWindow::Resize()
{
if (pRenderTarget != NULL)
{
RECT rc;
GetClientRect(m_hwnd, &rc);
D2D1_SIZE_U size = D2D1::SizeU(rc.right, rc.bottom);
pRenderTarget->Resize(size);
CalculateLayout();
InvalidateRect(m_hwnd, NULL, FALSE);
}
}