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Win32: Add separate window class for helper window

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The current window procedure needs to deal with messages both for user
created windows and the hidden helper window.

This commit separates out the device message handling of the helper
window, allowing both window procedures to be less complicated.
This commit is contained in:
Camilla Löwy
2022-03-27 19:40:35 +02:00
parent ad3dbeb65f
commit 2ae3e0c8d7
3 changed files with 64 additions and 45 deletions
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src/win32_init.c
+52 -1
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@@ -331,15 +331,63 @@ static void createKeyTables(void)
}
}
// Window procedure for the hidden helper window
//
static LRESULT CALLBACK helperWindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_DISPLAYCHANGE:
_glfwPollMonitorsWin32();
break;
case WM_DEVICECHANGE:
{
if (!_glfw.joysticksInitialized)
break;
if (wParam == DBT_DEVICEARRIVAL)
{
DEV_BROADCAST_HDR* dbh = (DEV_BROADCAST_HDR*) lParam;
if (dbh && dbh->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE)
_glfwDetectJoystickConnectionWin32();
}
else if (wParam == DBT_DEVICEREMOVECOMPLETE)
{
DEV_BROADCAST_HDR* dbh = (DEV_BROADCAST_HDR*) lParam;
if (dbh && dbh->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE)
_glfwDetectJoystickDisconnectionWin32();
}
break;
}
}
return DefWindowProcW(hWnd, uMsg, wParam, lParam);
}
// Creates a dummy window for behind-the-scenes work
//
static GLFWbool createHelperWindow(void)
{
MSG msg;
WNDCLASSEXW wc = { sizeof(wc) };
wc.style = CS_OWNDC;
wc.lpfnWndProc = (WNDPROC) helperWindowProc;
wc.hInstance = _glfw.win32.instance;
wc.lpszClassName = L"GLFW3 Helper";
if (!RegisterClassExW(&wc))
{
_glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
"WIn32: Failed to register helper window class");
return GLFW_FALSE;
}
_glfw.win32.helperWindowHandle =
CreateWindowExW(WS_EX_OVERLAPPEDWINDOW,
_GLFW_WNDCLASSNAME,
L"GLFW3 Helper",
L"GLFW message window",
WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
0, 0, 1, 1,
@@ -663,7 +711,10 @@ void _glfwTerminateWin32(void)
UnregisterDeviceNotification(_glfw.win32.deviceNotificationHandle);
if (_glfw.win32.helperWindowHandle)
{
DestroyWindow(_glfw.win32.helperWindowHandle);
UnregisterClassW(L"GLFW3 Helper", _glfw.win32.instance);
}
_glfwUnregisterWindowClassWin32();