Win32API: Snapping to screen edges
Something that has always annoyed me about some programs is that they don’t snap to the edges of the screen, so I decided to add this to the launcher.
I figured I should share the code, as well:
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LRESULT CALLBACK HandleMainWindowPosChanging(HWND hwnd, WINDOWPOS *wPos) { const char threshold = 10; RECT rect = { 0 }; HMONITOR hMonitor; MONITORINFO mi; // Grab information about our monitors // For multi-monitor support, we use this instead of SystemParametersInfo(SPI_GETWORKAREA, 0, &rect, 0); hMonitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST); mi.cbSize = sizeof(mi); GetMonitorInfo(hMonitor, &mi); rect = mi.rcWork; // Snap to left if( wPos->x >= (rect.left - threshold) && wPos->x <= (rect.left + threshold) ) wPos->x = rect.left; // Snap to right else if( (wPos->x + wPos->cx) >= (rect.right - threshold) && (wPos->x + wPos->cx) <= (rect.right + threshold) ) wPos->x = (rect.right - wPos->cx); // Snap to top if( wPos->y >= (rect.top - threshold) && wPos->y <= (rect.top + threshold) ) wPos->y = rect.top; // Snap to bottom else if( (wPos->y + wPos->cy) >= (rect.bottom - threshold) && (wPos->y + wPos->cy) <= (rect.bottom + threshold) ) wPos->y = (rect.bottom - wPos->cy); return FALSE; } |
and to use it,
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LRESULT CALLBACK MainWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) { switch(msg) { case WM_WINDOWPOSCHANGING: return HandleMainWindowPosChanging(hwnd, (WINDOWPOS *)lParam); } } |
I’ll be uploading an updated launcher soon.
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