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framelesshelper/winnativeeventfilter.cpp

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#include "winnativeeventfilter.h"
#include <QDebug>
#include <QGuiApplication>
#include <QLibrary>
#include <QOperatingSystemVersion>
#include <QWindow>
#include <d2d1.h>
#include <dwmapi.h>
#include <shellapi.h>
#include <uxtheme.h>
#include <windowsx.h>
#ifndef SM_CXPADDEDBORDER
// Only available since Windows Vista
#define SM_CXPADDEDBORDER 92
#endif
#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 WM_DWMCOMPOSITIONCHANGED
// Only available since Windows 7
#define WM_DWMCOMPOSITIONCHANGED 0x031E
#endif
namespace {
QScopedPointer<WinNativeEventFilter> instance;
QVector<HWND> m_framelessWindows;
} // namespace
WinNativeEventFilter::WinNativeEventFilter() {
QLibrary shcoreLib(QString::fromUtf8("SHCore"));
if (QOperatingSystemVersion::current() >=
QOperatingSystemVersion::Windows8_1) {
m_GetDpiForMonitor = reinterpret_cast<lpGetDpiForMonitor>(
shcoreLib.resolve("GetDpiForMonitor"));
}
QLibrary user32Lib(QString::fromUtf8("User32"));
// Windows 10, version 1607 (10.0.14393)
if (QOperatingSystemVersion::current() >=
QOperatingSystemVersion(QOperatingSystemVersion::Windows, 10, 0,
14393)) {
m_GetDpiForWindow = reinterpret_cast<lpGetDpiForWindow>(
user32Lib.resolve("GetDpiForWindow"));
m_GetDpiForSystem = reinterpret_cast<lpGetDpiForSystem>(
user32Lib.resolve("GetDpiForSystem"));
m_GetSystemMetricsForDpi = reinterpret_cast<lpGetSystemMetricsForDpi>(
user32Lib.resolve("GetSystemMetricsForDpi"));
}
// Windows 10, version 1709 (10.0.16299)
if (QOperatingSystemVersion::current() >=
QOperatingSystemVersion(QOperatingSystemVersion::Windows, 10, 0,
16299)) {
m_SetWindowCompositionAttribute =
reinterpret_cast<lpSetWindowCompositionAttribute>(
user32Lib.resolve("SetWindowCompositionAttribute"));
}
// Windows 10, version 1803 (10.0.17134)
if (QOperatingSystemVersion::current() >=
QOperatingSystemVersion(QOperatingSystemVersion::Windows, 10, 0,
17134)) {
m_GetSystemDpiForProcess = reinterpret_cast<lpGetSystemDpiForProcess>(
user32Lib.resolve("GetSystemDpiForProcess"));
}
}
WinNativeEventFilter::~WinNativeEventFilter() = default;
void WinNativeEventFilter::install() {
if (instance.isNull()) {
instance.reset(new WinNativeEventFilter);
qApp->installNativeEventFilter(instance.data());
}
}
void WinNativeEventFilter::uninstall() {
if (!instance.isNull()) {
qApp->removeNativeEventFilter(instance.data());
instance.reset();
}
if (!m_framelessWindows.isEmpty()) {
for (auto &&window : qAsConst(m_framelessWindows)) {
refreshWindow(window);
}
m_framelessWindows.clear();
}
}
QVector<HWND> WinNativeEventFilter::framelessWindows() {
return m_framelessWindows;
}
void WinNativeEventFilter::setFramelessWindows(QVector<HWND> windows) {
if (!windows.isEmpty() && (windows != m_framelessWindows)) {
m_framelessWindows = windows;
install();
}
}
void WinNativeEventFilter::addFramelessWindow(HWND window) {
if (window && !m_framelessWindows.contains(window)) {
m_framelessWindows.append(window);
install();
}
}
void WinNativeEventFilter::removeFramelessWindow(HWND window) {
if (window && m_framelessWindows.contains(window)) {
m_framelessWindows.removeAll(window);
}
}
void WinNativeEventFilter::clearFramelessWindows() {
if (!m_framelessWindows.isEmpty()) {
m_framelessWindows.clear();
}
}
UINT WinNativeEventFilter::windowDpi(HWND handle) const {
return getDpiForWindow(handle);
}
qreal WinNativeEventFilter::windowDpr(HWND handle) const {
return getDprForWindow(handle);
}
int WinNativeEventFilter::borderWidth(HWND handle) const {
return getSystemMetricsForWindow(handle, SM_CXFRAME) +
getSystemMetricsForWindow(handle, SM_CXPADDEDBORDER);
}
int WinNativeEventFilter::borderHeight(HWND handle) const {
return getSystemMetricsForWindow(handle, SM_CYFRAME) +
getSystemMetricsForWindow(handle, SM_CXPADDEDBORDER);
}
int WinNativeEventFilter::titlebarHeight(HWND handle) const {
return borderHeight(handle) +
getSystemMetricsForWindow(handle, SM_CYCAPTION);
}
void WinNativeEventFilter::refreshWindow(HWND handle) {
if (handle) {
SetWindowPos(handle, nullptr, 0, 0, 0, 0,
SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOSIZE |
SWP_NOMOVE | SWP_NOZORDER | SWP_NOOWNERZORDER);
}
}
#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
void *message, qintptr *result)
#else
bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
void *message, long *result)
#endif
{
Q_UNUSED(eventType)
const auto msg = static_cast<LPMSG>(message);
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;
}
if (m_framelessWindows.isEmpty()) {
bool isTopLevel = false;
// QWidgets with Qt::WA_NativeWindow enabled will make them become top
// level windows even if they are not. Try if
// Qt::WA_DontCreateNativeAncestors helps.
const auto topLevelWindows = QGuiApplication::topLevelWindows();
for (auto &&window : qAsConst(topLevelWindows)) {
if (window->handle() &&
(msg->hwnd == reinterpret_cast<HWND>(window->winId()))) {
isTopLevel = true;
break;
}
}
if (!isTopLevel) {
return false;
}
} else if (!m_framelessWindows.contains(msg->hwnd)) {
return false;
}
if (!m_windowData.contains(msg->hwnd)) {
// We have to record every window's state.
m_windowData.insert(msg->hwnd, qMakePair(FALSE, FALSE));
init(msg->hwnd);
}
switch (msg->message) {
case WM_NCCREATE: {
// Work-around a long-existing Windows bug.
const auto userData =
reinterpret_cast<LPCREATESTRUCTW>(msg->lParam)->lpCreateParams;
SetWindowLongPtrW(msg->hwnd, GWLP_USERDATA,
reinterpret_cast<LONG_PTR>(userData));
break;
}
case WM_NCCALCSIZE: {
if (static_cast<BOOL>(msg->wParam)) {
if (IsMaximized(msg->hwnd)) {
const HMONITOR monitor =
MonitorFromWindow(msg->hwnd, MONITOR_DEFAULTTONEAREST);
if (monitor) {
MONITORINFO monitorInfo;
SecureZeroMemory(&monitorInfo, sizeof(monitorInfo));
monitorInfo.cbSize = sizeof(monitorInfo);
GetMonitorInfoW(monitor, &monitorInfo);
auto &params =
*reinterpret_cast<LPNCCALCSIZE_PARAMS>(msg->lParam);
params.rgrc[0] = monitorInfo.rcWork;
// If the client rectangle is the same as the monitor's
// rectangle, the shell assumes that the window has gone
// fullscreen, so it removes the topmost attribute from any
// auto-hide appbars, making them inaccessible. To avoid
// this, reduce the size of the client area by one pixel on
// a certain edge. The edge is chosen based on which side of
// the monitor is likely to contain an auto-hide appbar, so
// the missing client area is covered by it.
if (EqualRect(&params.rgrc[0], &monitorInfo.rcMonitor)) {
APPBARDATA abd;
SecureZeroMemory(&abd, sizeof(abd));
abd.cbSize = sizeof(abd);
const UINT taskbarState =
SHAppBarMessage(ABM_GETSTATE, &abd);
if (taskbarState & ABS_AUTOHIDE) {
int edge = -1;
abd.hWnd = FindWindowW(L"Shell_TrayWnd", nullptr);
if (abd.hWnd) {
const HMONITOR taskbarMonitor =
MonitorFromWindow(abd.hWnd,
MONITOR_DEFAULTTONEAREST);
if (taskbarMonitor &&
(taskbarMonitor == monitor)) {
SHAppBarMessage(ABM_GETTASKBARPOS, &abd);
edge = abd.uEdge;
}
}
if (edge == ABE_BOTTOM) {
params.rgrc[0].bottom--;
} else if (edge == ABE_LEFT) {
params.rgrc[0].left++;
} else if (edge == ABE_TOP) {
params.rgrc[0].top++;
} else if (edge == ABE_RIGHT) {
params.rgrc[0].right--;
}
}
}
}
}
// This line removes the window frame (including the titlebar).
// But the frame shadow is lost at the same time. We'll bring it
// back later.
*result = WVR_REDRAW;
} else {
*result = 0;
}
return true;
}
case WM_DWMCOMPOSITIONCHANGED: {
// Bring the frame shadow back through DWM.
// Don't paint the shadow manually using QPainter or QGraphicsEffect.
handleDwmCompositionChanged(msg->hwnd);
*result = 0;
return true;
}
case WM_NCUAHDRAWCAPTION:
case WM_NCUAHDRAWFRAME: {
// These undocumented messages are sent to draw themed window
// borders. Block them to prevent drawing borders over the client
// area.
*result = 0;
return true;
}
case WM_NCPAINT: {
if (m_windowData.value(msg->hwnd).first) {
break;
} else {
// Only block WM_NCPAINT when composition is disabled. If it's
// blocked when composition is enabled, the window shadow won't
// be drawn.
*result = 0;
return true;
}
}
case WM_NCACTIVATE: {
// DefWindowProc won't repaint the window border if lParam (normally
// a HRGN) is -1.
*result = DefWindowProcW(msg->hwnd, msg->message, msg->wParam, -1);
return true;
}
case WM_NCHITTEST: {
const auto getHTResult = [this](HWND _hWnd, LPARAM _lParam) -> LRESULT {
RECT clientRect = {0, 0, 0, 0};
GetClientRect(_hWnd, &clientRect);
const LONG ww = clientRect.right;
const LONG wh = clientRect.bottom;
POINT mouse = {LONG(GET_X_LPARAM(_lParam)),
LONG(GET_Y_LPARAM(_lParam))};
ScreenToClient(_hWnd, &mouse);
// These values are DPI-aware.
const LONG bw = borderWidth(_hWnd);
const LONG bh = borderHeight(_hWnd);
const LONG tbh = titlebarHeight(_hWnd);
if (IsMaximized(_hWnd)) {
if (mouse.y < tbh) {
return HTCAPTION;
}
return HTCLIENT;
}
if (mouse.y < bh) {
if (mouse.x < bw) {
return HTTOPLEFT;
}
if (mouse.x > (ww - bw)) {
return HTTOPRIGHT;
}
return HTTOP;
}
if (mouse.y > (wh - bh)) {
if (mouse.x < bw) {
return HTBOTTOMLEFT;
}
if (mouse.x > (ww - bw)) {
return HTBOTTOMRIGHT;
}
return HTBOTTOM;
}
if (mouse.x < bw) {
return HTLEFT;
}
if (mouse.x > (ww - bw)) {
return HTRIGHT;
}
if (mouse.y < tbh) {
return HTCAPTION;
}
return HTCLIENT;
};
*result = getHTResult(msg->hwnd, msg->lParam);
return true;
}
case WM_GETMINMAXINFO: {
// Don't cover the taskbar when maximized.
const HMONITOR monitor =
MonitorFromWindow(msg->hwnd, MONITOR_DEFAULTTONEAREST);
if (monitor) {
MONITORINFO monitorInfo;
SecureZeroMemory(&monitorInfo, sizeof(monitorInfo));
monitorInfo.cbSize = sizeof(monitorInfo);
GetMonitorInfoW(monitor, &monitorInfo);
const RECT rcWorkArea = monitorInfo.rcWork;
const RECT rcMonitorArea = monitorInfo.rcMonitor;
auto &mmi = *reinterpret_cast<LPMINMAXINFO>(msg->lParam);
mmi.ptMaxPosition.x = qAbs(rcWorkArea.left - rcMonitorArea.left);
mmi.ptMaxPosition.y = qAbs(rcWorkArea.top - rcMonitorArea.top);
mmi.ptMaxSize.x = qAbs(rcWorkArea.right - rcWorkArea.left);
mmi.ptMaxSize.y = qAbs(rcWorkArea.bottom - rcWorkArea.top);
mmi.ptMaxTrackSize.x = mmi.ptMaxSize.x;
mmi.ptMaxTrackSize.y = mmi.ptMaxSize.y;
*result = 0;
return true;
}
break;
}
case WM_SETICON:
case WM_SETTEXT: {
// Disable painting while these messages are handled to prevent them
// from drawing a window caption over the client area, but only when
// composition and theming are disabled. These messages don't paint
// when composition is enabled and blocking WM_NCUAHDRAWCAPTION should
// be enough to prevent painting when theming is enabled.
if (!m_windowData.value(msg->hwnd).first &&
!m_windowData.value(msg->hwnd).second) {
const LONG_PTR 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);
const LRESULT ret = DefWindowProcW(msg->hwnd, msg->message,
msg->wParam, msg->lParam);
SetWindowLongPtrW(msg->hwnd, GWL_STYLE, oldStyle);
*result = ret;
return true;
}
break;
}
case WM_THEMECHANGED: {
handleThemeChanged(msg->hwnd);
break;
}
case WM_WINDOWPOSCHANGED: {
InvalidateRect(msg->hwnd, nullptr, TRUE);
break;
}
default:
break;
}
return false;
}
void WinNativeEventFilter::init(HWND handle) {
// Make sure our window is a normal application window, we'll remove the
// window frame later in Win32 events, don't use WS_POPUP to do this.
SetWindowLongPtrW(handle, GWL_STYLE,
WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN | WS_CLIPSIBLINGS);
SetWindowLongPtrW(handle, GWL_EXSTYLE, WS_EX_APPWINDOW | WS_EX_LAYERED);
// Make the window a layered window so the legacy GDI API can be used to
// draw to it without messing up the area on top of the DWM frame. Note:
// This is not necessary if other drawing APIs are used, eg. GDI+, OpenGL,
// Direct2D, Direct3D, DirectComposition, etc.
SetLayeredWindowAttributes(handle, RGB(255, 0, 255), 0, LWA_COLORKEY);
// Make sure our window has the frame shadow.
handleDwmCompositionChanged(handle);
handleThemeChanged(handle);
// For debug purposes.
qDebug().noquote() << "Window handle:" << handle;
qDebug().noquote() << "Window DPI:" << windowDpi(handle)
<< "Window DPR:" << windowDpr(handle);
qDebug().noquote() << "Window border width:" << borderWidth(handle)
<< "Window border height:" << borderHeight(handle)
<< "Window titlebar height:" << titlebarHeight(handle);
}
void WinNativeEventFilter::handleDwmCompositionChanged(HWND handle) {
BOOL enabled = FALSE;
DwmIsCompositionEnabled(&enabled);
const BOOL theme = m_windowData.value(handle).second;
m_windowData[handle] = qMakePair(enabled, theme);
// We should not draw the frame shadow if DWM composition is disabled, in
// other words, a window should not have frame shadow when Windows Aero is
// not enabled.
// Note that, start from Win8, the DWM composition is always enabled and
// can't be disabled.
if (enabled) {
// The frame shadow is drawn on the non-client area and thus we have to
// make sure the non-client area rendering is enabled first.
const DWMNCRENDERINGPOLICY ncrp = DWMNCRP_ENABLED;
DwmSetWindowAttribute(handle, DWMWA_NCRENDERING_POLICY, &ncrp,
sizeof(ncrp));
// Negative margins have special meaning to
// DwmExtendFrameIntoClientArea. Negative margins create the "sheet of
// glass" effect, where the client area is rendered as a solid surface
// with no window border.
const MARGINS margins = {-1, -1, -1, -1};
DwmExtendFrameIntoClientArea(handle, &margins);
}
// handleBlurForWindow(handle, enabled);
refreshWindow(handle);
}
void WinNativeEventFilter::handleThemeChanged(HWND handle) {
const BOOL dwm = m_windowData.value(handle).first;
m_windowData[handle] = qMakePair(dwm, IsThemeActive());
}
void WinNativeEventFilter::handleBlurForWindow(HWND handle,
BOOL compositionEnabled) {
if (!handle) {
return;
}
if (m_SetWindowCompositionAttribute) {
ACCENT_POLICY accent;
accent.AccentFlags = 0;
accent.GradientColor = 0;
accent.AnimationId = 0;
WINDOWCOMPOSITIONATTRIBDATA data;
data.dwAttribute = WCA_ACCENT_POLICY;
data.pvAttribute = &accent;
data.cbAttribute = sizeof(accent);
if (compositionEnabled) {
// Windows 10, version 1709 (10.0.16299)
if (QOperatingSystemVersion::current() >=
QOperatingSystemVersion(QOperatingSystemVersion::Windows, 10, 0,
16299)) {
// Acrylic
accent.AccentState = ACCENT_ENABLE_ACRYLICBLURBEHIND;
} else if (QOperatingSystemVersion::current() >=
QOperatingSystemVersion::Windows10) {
// Blur
accent.AccentState = ACCENT_ENABLE_BLURBEHIND;
} else if (QOperatingSystemVersion::current() >=
QOperatingSystemVersion::Windows8) {
// Transparent gradient color
accent.AccentState = ACCENT_ENABLE_TRANSPARENTGRADIENT;
}
} else {
accent.AccentState = ACCENT_DISABLED;
}
m_SetWindowCompositionAttribute(handle, &data);
} else if (QOperatingSystemVersion::current() >=
QOperatingSystemVersion::Windows7) {
// Windows Aero
DWM_BLURBEHIND dwmbb;
dwmbb.dwFlags = DWM_BB_ENABLE;
dwmbb.fEnable = compositionEnabled;
dwmbb.hRgnBlur = nullptr;
dwmbb.fTransitionOnMaximized = FALSE;
DwmEnableBlurBehindWindow(handle, &dwmbb);
}
}
UINT WinNativeEventFilter::getDpiForWindow(HWND handle) const {
const auto getScreenDpi = [](UINT defaultValue) -> UINT {
// Available since Windows 7.
ID2D1Factory *m_pDirect2dFactory = nullptr;
if (SUCCEEDED(D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED,
&m_pDirect2dFactory)) &&
m_pDirect2dFactory) {
m_pDirect2dFactory->ReloadSystemMetrics();
FLOAT dpiX = defaultValue, dpiY = defaultValue;
m_pDirect2dFactory->GetDesktopDpi(&dpiX, &dpiY);
// The values of *dpiX and *dpiY are identical.
return dpiX;
}
// Available since Windows 2000.
const HDC hdc = GetDC(nullptr);
if (hdc) {
const int dpiX = GetDeviceCaps(hdc, LOGPIXELSX);
const int dpiY = GetDeviceCaps(hdc, LOGPIXELSY);
ReleaseDC(nullptr, hdc);
// The values of dpiX and dpiY are identical actually, just to
// silence a compiler warning.
return dpiX == dpiY ? dpiX : dpiY;
}
return defaultValue;
};
if (!handle) {
if (m_GetSystemDpiForProcess) {
return m_GetSystemDpiForProcess(GetCurrentProcess());
} else if (m_GetDpiForSystem) {
return m_GetDpiForSystem();
} else {
return getScreenDpi(m_defaultDPI);
}
}
if (m_GetDpiForWindow) {
return m_GetDpiForWindow(handle);
}
if (m_GetDpiForMonitor) {
UINT dpiX = m_defaultDPI, dpiY = m_defaultDPI;
m_GetDpiForMonitor(MonitorFromWindow(handle, MONITOR_DEFAULTTONEAREST),
MDT_EFFECTIVE_DPI, &dpiX, &dpiY);
// The values of *dpiX and *dpiY are identical.
return dpiX;
}
return getScreenDpi(m_defaultDPI);
}
qreal WinNativeEventFilter::getDprForWindow(HWND handle) const {
return handle ? (qreal(getDpiForWindow(handle)) / qreal(m_defaultDPI))
: m_defaultDPR;
}
int WinNativeEventFilter::getSystemMetricsForWindow(HWND handle,
int index) const {
if (m_GetSystemMetricsForDpi) {
return m_GetSystemMetricsForDpi(index, getDpiForWindow(handle));
} else {
return GetSystemMetrics(index) * getDprForWindow(handle);
}
}
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