126 lines
2.5 KiB
C++
126 lines
2.5 KiB
C++
// 6 april 2015
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#include "uipriv_windows.hpp"
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static HHOOK filter;
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static LRESULT CALLBACK filterProc(int code, WPARAM wParam, LPARAM lParam)
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{
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MSG *msg = (MSG *) lParam;
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if (code < 0)
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goto callNext;
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if (areaFilter(msg)) // don't continue to our IsDialogMessage() hack if the area handled it
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goto discard;
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// TODO IsDialogMessage() hack here
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// otherwise keep going
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goto callNext;
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discard:
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// we handled it; discard the message so the dialog manager doesn't see it
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return 1;
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callNext:
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return CallNextHookEx(filter, code, wParam, lParam);
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}
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int registerMessageFilter(void)
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{
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filter = SetWindowsHookExW(WH_MSGFILTER,
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filterProc,
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hInstance,
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GetCurrentThreadId());
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return filter != NULL;
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}
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void unregisterMessageFilter(void)
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{
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if (UnhookWindowsHookEx(filter) == 0)
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logLastError(L"error unregistering libui message filter");
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}
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// LONGTERM http://blogs.msdn.com/b/oldnewthing/archive/2005/04/08/406509.aspx when adding accelerators, TranslateAccelerators() before IsDialogMessage()
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static void processMessage(MSG *msg)
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{
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HWND correctParent;
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if (msg->hwnd != NULL)
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correctParent = parentToplevel(msg->hwnd);
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else // just to be safe
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correctParent = GetActiveWindow();
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if (correctParent != NULL)
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// this calls our mesage filter above for us
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if (IsDialogMessage(correctParent, msg) != 0)
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return;
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TranslateMessage(msg);
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DispatchMessageW(msg);
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}
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static int waitMessage(MSG *msg)
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{
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int res;
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res = GetMessageW(msg, NULL, 0, 0);
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if (res < 0) {
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logLastError(L"error calling GetMessage()");
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return 0; // bail out on error
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}
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return res != 0; // returns false on WM_QUIT
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}
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void uiMain(void)
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{
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while (uiMainStep(1))
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;
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}
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static int peekMessage(MSG *msg)
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{
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BOOL res;
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res = PeekMessageW(msg, NULL, 0, 0, PM_REMOVE);
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if (res == 0)
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return 2; // no message available
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if (msg->message != WM_QUIT)
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return 1; // a message
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return 0; // WM_QUIT
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}
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int uiMainStep(int wait)
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{
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MSG msg;
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if (wait) {
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if (!waitMessage(&msg))
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return 0;
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processMessage(&msg);
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return 1;
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}
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// don't wait for a message
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switch (peekMessage(&msg)) {
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case 0: // quit
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// TODO PostQuitMessage() again?
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return 0;
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case 1: // process a message
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processMessage(&msg);
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// fall out to the case for no message
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}
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return 1; // no message
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}
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void uiQuit(void)
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{
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PostQuitMessage(0);
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}
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void uiQueueMain(void (*f)(void *data), void *data)
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{
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if (PostMessageW(utilWindow, msgQueued, (WPARAM) f, (LPARAM) data) == 0)
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// LONGTERM this is likely not safe to call across threads (allocates memory)
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logLastError(L"error queueing function to run on main thread");
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}
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