libui/windows/utilwin.cpp

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// 14 may 2015
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#include "uipriv_windows.hpp"
// The utility window is a special window that performs certain tasks internal to libui.
// It is not a message-only window, and it is always hidden and disabled.
// Its roles:
// - It is the initial parent of all controls. When a control loses its parent, it also becomes that control's parent.
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// - It handles WM_QUERYENDSESSION requests.
// - It handles WM_WININICHANGE and forwards the message to any child windows that request it.
// - It handles executing functions queued to run by uiQueueMain().
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// TODO explain why it isn't message-only
#define utilWindowClass L"libui_utilWindowClass"
HWND utilWindow;
static LRESULT CALLBACK utilWindowWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
void (*qf)(void *);
LRESULT lResult;
if (handleParentMessages(hwnd, uMsg, wParam, lParam, &lResult) != FALSE)
return lResult;
switch (uMsg) {
case WM_QUERYENDSESSION:
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// TODO block handler (TODO figure out if this meant the Vista-style block handler or not)
if (uiprivShouldQuit()) {
uiQuit();
return TRUE;
}
return FALSE;
case WM_WININICHANGE:
issueWM_WININICHANGE(wParam, lParam);
return 0;
case msgQueued:
qf = (void (*)(void *)) wParam;
(*qf)((void *) lParam);
return 0;
}
return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}
const char *initUtilWindow(HICON hDefaultIcon, HCURSOR hDefaultCursor)
{
WNDCLASSW wc;
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ZeroMemory(&wc, sizeof (WNDCLASSW));
wc.lpszClassName = utilWindowClass;
wc.lpfnWndProc = utilWindowWndProc;
wc.hInstance = hInstance;
wc.hIcon = hDefaultIcon;
wc.hCursor = hDefaultCursor;
wc.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1);
if (RegisterClass(&wc) == 0)
// see init.cpp for an explanation of the =s
return "=registering utility window class";
utilWindow = CreateWindowExW(0,
utilWindowClass, L"libui utility window",
WS_OVERLAPPEDWINDOW,
0, 0, 100, 100,
NULL, NULL, hInstance, NULL);
if (utilWindow == NULL)
return "=creating utility window";
// and just to be safe
EnableWindow(utilWindow, FALSE);
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return NULL;
}
void uninitUtilWindow(void)
{
if (DestroyWindow(utilWindow) == 0)
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logLastError(L"error destroying utility window");
if (UnregisterClass(utilWindowClass, hInstance) == 0)
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logLastError(L"error unregistering utility window class");
}