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33 lines
1.0 KiB
C++
33 lines
1.0 KiB
C++
#pragma once
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#include <QAbstractNativeEventFilter>
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#include <QString>
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#define NOMINMAX
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#include <Windows.h>
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class WinEventFilter : public QAbstractNativeEventFilter
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{
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public:
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WinEventFilter() = default;
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/*
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* When having the DWM frame fully extended into client area
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* ever since WIN10 a 6px border is displayed on top.
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* to remove that one has to catch the WM_NCCALCSIZE event and re-calculate the window-rect
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* https://stackoverflow.com/a/2135120/5106063
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* https://docs.microsoft.com/en-us/windows/win32/dwm/customframe
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*/
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bool nativeEventFilter(const QByteArray& eventType, void* message, qintptr* result) override
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{
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if (QString(eventType) == "windows_generic_MSG") {
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auto msg = static_cast<MSG*>(message)->message;
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auto lParam = static_cast<MSG*>(message)->lParam;
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if (msg == WM_NCCALCSIZE)
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{
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auto sz = reinterpret_cast<LPNCCALCSIZE_PARAMS>(lParam);
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sz->rgrc[0].top -= 6;
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}
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}
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return false;
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}
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};
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