/* * MIT License * * Copyright (C) 2021 by wangwenx190 (Yuhang Zhao) * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #ifndef WIN32_LEAN_AND_MEAN #define WIN32_LEAN_AND_MEAN #endif #ifndef _CRT_SECURE_NO_WARNINGS #define _CRT_SECURE_NO_WARNINGS #endif #include "framelesshelper_win32.h" #include #include #include #include #include #include #include "utilities.h" #ifndef WM_NCUAHDRAWCAPTION // Not documented, only available since Windows Vista #define WM_NCUAHDRAWCAPTION 0x00AE #endif #ifndef WM_NCUAHDRAWFRAME // Not documented, only available since Windows Vista #define WM_NCUAHDRAWFRAME 0x00AF #endif #ifndef ABM_GETAUTOHIDEBAREX // Only available since Windows 8.1 #define ABM_GETAUTOHIDEBAREX 0x0000000b #endif #ifndef IsMinimized // Only available since Windows 2000 #define IsMinimized(h) IsIconic(h) #endif #ifndef IsMaximized // Only available since Windows 2000 #define IsMaximized(h) IsZoomed(h) #endif #ifndef GET_X_LPARAM // Only available since Windows 2000 #define GET_X_LPARAM(lp) ((int) (short) LOWORD(lp)) #endif #ifndef GET_Y_LPARAM // Only available since Windows 2000 #define GET_Y_LPARAM(lp) ((int) (short) HIWORD(lp)) #endif static inline bool shouldHaveWindowFrame() { if (Utilities::shouldUseNativeTitleBar()) { // We have to use the original window frame unconditionally if we // want to use the native title bar. return true; } const bool should = qEnvironmentVariableIsSet(_flh_global::_flh_preserveNativeFrame_flag); const bool force = qEnvironmentVariableIsSet(_flh_global::_flh_forcePreserveNativeFrame_flag); if (should || force) { if (force) { return true; } if (should) { // If you preserve the window frame on Win7~8.1, // the window will have a terrible appearance. return Utilities::isWin10OrGreater(); } } return false; } // The thickness of an auto-hide taskbar in pixels. static const int kAutoHideTaskbarThicknessPx = 2; static const int kAutoHideTaskbarThicknessPy = kAutoHideTaskbarThicknessPx; static QScopedPointer g_instance; static inline void setup() { if (g_instance.isNull()) { g_instance.reset(new FramelessHelperWin); qApp->installNativeEventFilter(g_instance.data()); } } static inline void installHelper(QWindow *window, const bool enable) { Q_ASSERT(window); if (!window) { return; } window->setProperty(_flh_global::_flh_framelessEnabled_flag, enable); Utilities::updateQtFrameMargins(window, enable); Utilities::updateFrameMargins(window, !enable); Utilities::triggerFrameChange(window); } FramelessHelperWin::FramelessHelperWin() = default; FramelessHelperWin::~FramelessHelperWin() { if (!g_instance.isNull()) { qApp->removeNativeEventFilter(g_instance.data()); } } void FramelessHelperWin::addFramelessWindow(QWindow *window) { Q_ASSERT(window); setup(); installHelper(window, true); } bool FramelessHelperWin::isWindowFrameless(const QWindow *window) { Q_ASSERT(window); if (!window) { return false; } return window->property(_flh_global::_flh_framelessEnabled_flag).toBool(); } void FramelessHelperWin::removeFramelessWindow(QWindow *window) { Q_ASSERT(window); if (!window) { return; } installHelper(window, false); } #if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)) bool FramelessHelperWin::nativeEventFilter(const QByteArray &eventType, void *message, qintptr *result) #else bool FramelessHelperWin::nativeEventFilter(const QByteArray &eventType, void *message, long *result) #endif { if ((eventType != QByteArrayLiteral("windows_generic_MSG")) || !message || !result) { return false; } #if (QT_VERSION == QT_VERSION_CHECK(5, 11, 1)) // Work-around a bug caused by typo which only exists in Qt 5.11.1 const auto msg = *reinterpret_cast(message); #else const auto msg = static_cast(message); #endif if (!msg->hwnd) { // Why sometimes the window handle is null? Is it designed to be? // Anyway, we should skip it in this case. return false; } const QWindow *window = Utilities::findWindow(reinterpret_cast(msg->hwnd)); if (!window || !window->property(_flh_global::_flh_framelessEnabled_flag).toBool()) { return false; } switch (msg->message) { case WM_NCCALCSIZE: { // Windows是根据这个消息的返回值来设置窗口的客户区（窗口中真正显示的内容） // 和非客户区（标题栏、窗口边框、菜单栏和状态栏等Windows系统自行提供的部分 // ，不过对于Qt来说，除了标题栏和窗口边框，非客户区基本也都是自绘的）的范 // 围的，lParam里存放的就是新客户区的几何区域，默认是整个窗口的大小，正常 // 的程序需要修改这个参数，告知系统窗口的客户区和非客户区的范围（一般来说可 // 以完全交给Windows，让其自行处理，使用默认的客户区和非客户区），因此如果 // 我们不修改lParam，就可以使客户区充满整个窗口，从而去掉标题栏和窗口边框 // （因为这些东西都被客户区给盖住了。但边框阴影也会因此而丢失，不过我们会使 // 用其他方式将其带回，请参考其他消息的处理，此处不过多提及）。但有个情况要 // 特别注意，那就是窗口最大化后，窗口的实际尺寸会比屏幕的尺寸大一点，从而使 // 用户看不到窗口的边界，这样用户就不能在窗口最大化后调整窗口的大小了（虽然 // 这个做法听起来特别奇怪，但Windows确实就是这样做的），因此如果我们要自行 // 处理窗口的非客户区，就要在窗口最大化后，将窗口边框的宽度和高度（一般是相 // 等的）从客户区裁剪掉，否则我们窗口所显示的内容就会超出屏幕边界，显示不全。 // 如果用户开启了任务栏自动隐藏，在窗口最大化后，还要考虑任务栏的位置。因为 // 如果窗口最大化后，其尺寸和屏幕尺寸相等（因为任务栏隐藏了，所以窗口最大化 // 后其实是充满了整个屏幕，变相的全屏了），Windows会认为窗口已经进入全屏的 // 状态，从而导致自动隐藏的任务栏无法弹出。要避免这个状况，就要使窗口的尺寸 // 小于屏幕尺寸。我下面的做法参考了火狐、Chromium和Windows Terminal // 如果没有开启任务栏自动隐藏，是不存在这个问题的，所以要先进行判断。 // 一般情况下，*result设置为0（相当于DefWindowProc的返回值为0）就可以了， // 根据MSDN的说法，返回0意为此消息已经被程序自行处理了，让Windows跳过此消 // 息，否则Windows会添加对此消息的默认处理，对于当前这个消息而言，就意味着 // 标题栏和窗口边框又会回来，这当然不是我们想要的结果。根据MSDN，当wParam // 为FALSE时，只能返回0，但当其为TRUE时，可以返回0，也可以返回一个WVR_常 // 量。根据Chromium的注释，当存在非客户区时，如果返回WVR_REDRAW会导致子 // 窗口/子控件出现奇怪的bug（自绘控件错位），并且Lucas在Windows 10 // 上成功复现，说明这个bug至今都没有解决。我查阅了大量资料，发现唯一的解决 // 方案就是返回0。但如果不存在非客户区，且wParam为TRUE，最好返回 // WVR_REDRAW，否则窗口在调整大小可能会产生严重的闪烁现象。 // 虽然对大多数消息来说，返回0都代表让Windows忽略此消息，但实际上不同消息 // 能接受的返回值是不一样的，请注意自行查阅MSDN。 // Sent when the size and position of a window's client area must be // calculated. By processing this message, an application can // control the content of the window's client area when the size or // position of the window changes. If wParam is TRUE, lParam points // to an NCCALCSIZE_PARAMS structure that contains information an // application can use to calculate the new size and position of the // client rectangle. If wParam is FALSE, lParam points to a RECT // structure. On entry, the structure contains the proposed window // rectangle for the window. On exit, the structure should contain // the screen coordinates of the corresponding window client area. // The client area is the window's content area, the non-client area // is the area which is provided by the system, such as the title // bar, the four window borders, the frame shadow, the menu bar, the // status bar, the scroll bar, etc. But for Qt, it draws most of the // window area (client + non-client) itself. We now know that the // title bar and the window frame is in the non-client area and we // can set the scope of the client area in this message, so we can // remove the title bar and the window frame by let the non-client // area be covered by the client area (because we can't really get // rid of the non-client area, it will always be there, all we can // do is to hide it) , which means we should let the client area's // size the same with the whole window's size. So there is no room // for the non-client area and then the user won't be able to see it // again. But how to achieve this? Very easy, just leave lParam (the // re-calculated client area) untouched. But of course you can // modify lParam, then the non-client area will be seen and the // window borders and the window frame will show up. However, things // are quite different when you try to modify the top margin of the // client area. DWM will always draw the whole title bar no matter // what margin value you set for the top, unless you don't modify it // and remove the whole top area (the title bar + the one pixel // height window border). This can be confirmed in Windows // Terminal's source code, you can also try yourself to verify // it. So things will become quite complicated if you want to // preserve the four window borders. So we just remove the whole // window frame, otherwise the code will become much more complex. if (Utilities::shouldUseNativeTitleBar()) { break; } if (!msg->wParam) { *result = 0; return true; } bool nonClientAreaExists = false; const auto clientRect = &(reinterpret_cast(msg->lParam)->rgrc[0]); if (shouldHaveWindowFrame()) { // Store the original top before the default window proc // applies the default frame. const LONG originalTop = clientRect->top; // Apply the default frame const LRESULT ret = DefWindowProcW(msg->hwnd, WM_NCCALCSIZE, msg->wParam, msg->lParam); if (ret != 0) { *result = ret; return true; } // Re-apply the original top from before the size of the // default frame was applied. clientRect->top = originalTop; } // We don't need this correction when we're fullscreen. We will // have the WS_POPUP size, so we don't have to worry about // borders, and the default frame will be fine. if (IsMaximized(msg->hwnd) && (window->windowState() != Qt::WindowFullScreen)) { // Windows automatically adds a standard width border to all // sides when a window is maximized. We have to remove it // otherwise the content of our window will be cut-off from // the screen. // The value of border width and border height should be // identical in most cases, when the scale factor is 1.0, it // should be eight pixels. const int bh = getSystemMetric(window, Utilities::SystemMetric::BorderHeight, true); clientRect->top += bh; if (!shouldHaveWindowFrame()) { clientRect->bottom -= bh; const int bw = getSystemMetric(window, Utilities::SystemMetric::BorderWidth, true); clientRect->left += bw; clientRect->right -= bw; } nonClientAreaExists = true; } // Attempt to detect if there's an autohide taskbar, and if // there is, reduce our size a bit on the side with the taskbar, // so the user can still mouse-over the taskbar to reveal it. // Make sure to use MONITOR_DEFAULTTONEAREST, so that this will // still find the right monitor even when we're restoring from // minimized. if (IsMaximized(msg->hwnd)) { APPBARDATA abd; SecureZeroMemory(&abd, sizeof(abd)); abd.cbSize = sizeof(abd); const UINT taskbarState = SHAppBarMessage(ABM_GETSTATE, &abd); // First, check if we have an auto-hide taskbar at all: if (taskbarState & ABS_AUTOHIDE) { bool top = false, bottom = false, left = false, right = false; // Due to ABM_GETAUTOHIDEBAREX only exists from Win8.1, // we have to use another way to judge this if we are // running on Windows 7 or Windows 8. if (Utilities::isWin8Point1OrGreater()) { MONITORINFO monitorInfo; SecureZeroMemory(&monitorInfo, sizeof(monitorInfo)); monitorInfo.cbSize = sizeof(monitorInfo); const HMONITOR monitor = MonitorFromWindow(msg->hwnd, MONITOR_DEFAULTTONEAREST); GetMonitorInfoW(monitor, &monitorInfo); // This helper can be used to determine if there's a // auto-hide taskbar on the given edge of the monitor // we're currently on. const auto hasAutohideTaskbar = [&monitorInfo](const UINT edge) -> bool { APPBARDATA _abd; SecureZeroMemory(&_abd, sizeof(_abd)); _abd.cbSize = sizeof(_abd); _abd.uEdge = edge; _abd.rc = monitorInfo.rcMonitor; const auto hTaskbar = reinterpret_cast(SHAppBarMessage(ABM_GETAUTOHIDEBAREX, &_abd)); return hTaskbar != nullptr; }; top = hasAutohideTaskbar(ABE_TOP); bottom = hasAutohideTaskbar(ABE_BOTTOM); left = hasAutohideTaskbar(ABE_LEFT); right = hasAutohideTaskbar(ABE_RIGHT); } else { // The following code is copied from Mozilla Firefox, // with some modifications. int edge = -1; APPBARDATA _abd; SecureZeroMemory(&_abd, sizeof(_abd)); _abd.cbSize = sizeof(_abd); _abd.hWnd = FindWindowW(L"Shell_TrayWnd", nullptr); if (_abd.hWnd) { const HMONITOR windowMonitor = MonitorFromWindow(msg->hwnd, MONITOR_DEFAULTTONEAREST); const HMONITOR taskbarMonitor = MonitorFromWindow(_abd.hWnd, MONITOR_DEFAULTTOPRIMARY); if (taskbarMonitor == windowMonitor) { SHAppBarMessage(ABM_GETTASKBARPOS, &_abd); edge = _abd.uEdge; } } top = edge == ABE_TOP; bottom = edge == ABE_BOTTOM; left = edge == ABE_LEFT; right = edge == ABE_RIGHT; } // If there's a taskbar on any side of the monitor, reduce // our size a little bit on that edge. // Note to future code archeologists: // This doesn't seem to work for fullscreen on the primary // display. However, testing a bunch of other apps with // fullscreen modes and an auto-hiding taskbar has // shown that _none_ of them reveal the taskbar from // fullscreen mode. This includes Edge, Firefox, Chrome, // Sublime Text, PowerPoint - none seemed to support this. // This does however work fine for maximized. if (top) { // Peculiarly, when we're fullscreen, clientRect->top += kAutoHideTaskbarThicknessPy; nonClientAreaExists = true; } else if (bottom) { clientRect->bottom -= kAutoHideTaskbarThicknessPy; nonClientAreaExists = true; } else if (left) { clientRect->left += kAutoHideTaskbarThicknessPx; nonClientAreaExists = true; } else if (right) { clientRect->right -= kAutoHideTaskbarThicknessPx; nonClientAreaExists = true; } } } #if 0 // Fix the flickering issue while resizing. // "clientRect->right += 1;" also works. // The only draw back of this small trick is it will affect // Qt's coordinate system. It makes the "canvas" of the window // larger than it should be. Be careful if you need to paint // something manually either through QPainter or Qt Quick. clientRect->bottom += 1; #endif // If the window bounds change, we're going to relayout and repaint // anyway. Returning WVR_REDRAW avoids an extra paint before that of // the old client pixels in the (now wrong) location, and thus makes // actions like resizing a window from the left edge look slightly // less broken. // // We cannot return WVR_REDRAW when there is nonclient area, or // Windows exhibits bugs where client pixels and child HWNDs are // mispositioned by the width/height of the upper-left nonclient // area. *result = nonClientAreaExists ? 0 : WVR_REDRAW; return true; } // These undocumented messages are sent to draw themed window // borders. Block them to prevent drawing borders over the client // area. case WM_NCUAHDRAWCAPTION: case WM_NCUAHDRAWFRAME: { if (shouldHaveWindowFrame()) { break; } else { *result = 0; return true; } } case WM_NCPAINT: { // 边框阴影处于非客户区的范围，因此如果直接阻止非客户区的绘制，会导致边框阴影丢失 if (!Utilities::isDwmBlurAvailable() && !shouldHaveWindowFrame()) { // Only block WM_NCPAINT when DWM composition is disabled. If // it's blocked when DWM composition is enabled, the frame // shadow won't be drawn. *result = 0; return true; } else { break; } } case WM_NCACTIVATE: { if (shouldHaveWindowFrame()) { break; } else { if (Utilities::isDwmBlurAvailable()) { // DefWindowProc won't repaint the window border if lParam // (normally a HRGN) is -1. See the following link's "lParam" // section: // https://docs.microsoft.com/en-us/windows/win32/winmsg/wm-ncactivate // Don't use "*result = 0" otherwise the window won't respond // to the window active state change. *result = DefWindowProcW(msg->hwnd, msg->message, msg->wParam, -1); } else { if (static_cast(msg->wParam)) { *result = FALSE; } else { *result = TRUE; } } return true; } } case WM_NCHITTEST: { // 原生Win32窗口只有顶边是在窗口内部resize的，其余三边都是在窗口 // 外部进行resize的，其原理是，WS_THICKFRAME这个窗口样式会在窗 // 口的左、右和底边添加三个透明的resize区域，这三个区域在正常状态 // 下是完全不可见的，它们由DWM负责绘制和控制。这些区域的宽度等于 // (SM_CXSIZEFRAME + SM_CXPADDEDBORDER)，高度等于 // (SM_CYSIZEFRAME + SM_CXPADDEDBORDER)，在100%缩放时，均等 // 于8像素。它们属于窗口区域的一部分，但不属于客户区，而是属于非客 // 户区，因此GetWindowRect获取的区域中是包含这三个resize区域的， // 而GetClientRect获取的区域是不包含它们的。当把 // DWMWA_EXTENDED_FRAME_BOUNDS作为参数调用 // DwmGetWindowAttribute时，也能获取到一个窗口大小，这个大小介 // 于前面两者之间，暂时不知道这个数据的意义及其作用。我们在 // WM_NCCALCSIZE消息的处理中，已经把整个窗口都设置为客户区了，也 // 就是说，我们的窗口已经没有非客户区了，因此那三个透明的resize区 // 域，此刻也已经成为窗口客户区的一部分了，从而变得不透明了。所以 // 现在的resize，看起来像是在窗口内部resize，是因为原本透明的地方 // 现在变得不透明了，实际上，单纯从范围上来看，现在我们resize的地方， // 就是普通窗口的边框外部，那三个透明区域的范围。 // 因此，如果我们把边框完全去掉（就是我们正在做的事情），resize就 // 会看起来是在内部进行，这个问题通过常规方法非常难以解决。我测试过 // QQ和钉钉的窗口，它们的窗口就是在外部resize，但实际上它们是通过 // 把窗口实际的内容，嵌入到一个完全透明的但尺寸要大一圈的窗口中实现 // 的，虽然看起来效果还行，但在我看来不是正途。而且我之所以能发现， // 也是由于这种方法在很多情况下会露馅，比如窗口未响应卡住或贴边的时 // 候，能明显看到窗口周围多出来一圈边界。我曾经尝试再把那三个区域弄 // 透明，但无一例外都会破坏DWM绘制的边框阴影，因此只好作罢。 // As you may have found, if you use this code, the resize areas // will be inside the frameless window, however, a normal Win32 // window can be resized outside of it. Here is the reason: the // WS_THICKFRAME window style will cause a window has three // transparent areas beside the window's left, right and bottom // edge. Their width or height is eight pixels if the window is not // scaled. In most cases, they are totally invisible. It's DWM's // responsibility to draw and control them. They exist to let the // user resize the window, visually outside of it. They are in the // window area, but not the client area, so they are in the // non-client area actually. But we have turned the whole window // area into client area in WM_NCCALCSIZE, so the three transparent // resize areas also become a part of the client area and thus they // become visible. When we resize the window, it looks like we are // resizing inside of it, however, that's because the transparent // resize areas are visible now, we ARE resizing outside of the // window actually. But I don't know how to make them become // transparent again without breaking the frame shadow drawn by DWM. // If you really want to solve it, you can try to embed your window // into a larger transparent window and draw the frame shadow // yourself. As what we have said in WM_NCCALCSIZE, you can only // remove the top area of the window, this will let us be able to // resize outside of the window and don't need much process in this // message, it looks like a perfect plan, however, the top border is // missing due to the whole top area is removed, and it's very hard // to bring it back because we have to use a trick in WM_PAINT // (learned from Windows Terminal), but no matter what we do in // WM_PAINT, it will always break the backing store mechanism of Qt, // so actually we can't do it. And it's very difficult to do such // things in NativeEventFilters as well. What's worse, if we really // do this, the four window borders will become white and they look // horrible in dark mode. This solution only supports Windows 10 // because the border width on Win10 is only one pixel, however it's // eight pixels on Windows 7 so preserving the three window borders // looks terrible on old systems. I'm testing this solution in // another branch, if you are interested in it, you can give it a // try. if (Utilities::shouldUseNativeTitleBar()) { break; } const QPointF globalMouse = Utilities::getGlobalMousePosition(window); POINT winLocalMouse = {qRound(globalMouse.x()), qRound(globalMouse.y())}; ScreenToClient(msg->hwnd, &winLocalMouse); const QPointF localMouse = {static_cast(winLocalMouse.x), static_cast(winLocalMouse.y)}; const int bh = getSystemMetric(window, Utilities::SystemMetric::BorderHeight, true); const int tbh = getSystemMetric(window, Utilities::SystemMetric::TitleBarHeight, true); const bool isTitleBar = (localMouse.y() <= tbh) && !Utilities::isHitTestVisibleInChrome(window); const bool isTop = localMouse.y() <= bh; if (shouldHaveWindowFrame()) { // This will handle the left, right and bottom parts of the frame // because we didn't change them. const LRESULT originalRet = DefWindowProcW(msg->hwnd, WM_NCHITTEST, msg->wParam, msg->lParam); if (originalRet != HTCLIENT) { *result = originalRet; return true; } // At this point, we know that the cursor is inside the client area // so it has to be either the little border at the top of our custom // title bar or the drag bar. Apparently, it must be the drag bar or // the little border at the top which the user can use to move or // resize the window. if (!IsMaximized(msg->hwnd) && isTop) { *result = HTTOP; return true; } if (isTitleBar) { *result = HTCAPTION; return true; } *result = HTCLIENT; return true; } else { const auto getHitTestResult = [msg, isTitleBar, &localMouse, bh, isTop, window]() -> LRESULT { RECT clientRect = {0, 0, 0, 0}; GetClientRect(msg->hwnd, &clientRect); const LONG ww = clientRect.right; const LONG wh = clientRect.bottom; const int bw = getSystemMetric(window, Utilities::SystemMetric::BorderWidth, true); if (IsMaximized(msg->hwnd)) { if (isTitleBar) { return HTCAPTION; } return HTCLIENT; } const bool isBottom = (localMouse.y() >= (wh - bh)); // Make the border a little wider to let the user easy to resize on corners. const int factor = (isTop || isBottom) ? 2 : 1; const bool isLeft = (localMouse.x() <= (bw * factor)); const bool isRight = (localMouse.x() >= (ww - (bw * factor))); const bool fixedSize = Utilities::isWindowFixedSize(window); const auto getBorderValue = [fixedSize](int value) -> int { return fixedSize ? HTCLIENT : value; }; if (isTop) { if (isLeft) { return getBorderValue(HTTOPLEFT); } if (isRight) { return getBorderValue(HTTOPRIGHT); } return getBorderValue(HTTOP); } if (isBottom) { if (isLeft) { return getBorderValue(HTBOTTOMLEFT); } if (isRight) { return getBorderValue(HTBOTTOMRIGHT); } return getBorderValue(HTBOTTOM); } if (isLeft) { return getBorderValue(HTLEFT); } if (isRight) { return getBorderValue(HTRIGHT); } if (isTitleBar) { return HTCAPTION; } return HTCLIENT; }; *result = getHitTestResult(); return true; } } case WM_SETICON: case WM_SETTEXT: { if (Utilities::shouldUseNativeTitleBar()) { break; } // Disable painting while these messages are handled to prevent them // from drawing a window caption over the client area. const auto oldStyle = GetWindowLongPtrW(msg->hwnd, GWL_STYLE); // Prevent Windows from drawing the default title bar by temporarily // toggling the WS_VISIBLE style. SetWindowLongPtrW(msg->hwnd, GWL_STYLE, oldStyle & ~WS_VISIBLE); Utilities::triggerFrameChange(window); const LRESULT ret = DefWindowProcW(msg->hwnd, msg->message, msg->wParam, msg->lParam); SetWindowLongPtrW(msg->hwnd, GWL_STYLE, oldStyle); Utilities::triggerFrameChange(window); *result = ret; return true; } default: break; } return false; } void FramelessHelperWin::setBorderWidth(QWindow *window, const int bw) { Q_ASSERT(window); if (!window) { return; } window->setProperty(_flh_global::_flh_borderWidth_flag, bw); } void FramelessHelperWin::setBorderHeight(QWindow *window, const int bh) { Q_ASSERT(window); if (!window) { return; } window->setProperty(_flh_global::_flh_borderHeight_flag, bh); } void FramelessHelperWin::setTitleBarHeight(QWindow *window, const int tbh) { Q_ASSERT(window); if (!window) { return; } window->setProperty(_flh_global::_flh_titleBarHeight_flag, tbh); }