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framelesshelper
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Update. 

Signed-off-by: Yuhang Zhao <2546789017@qq.com>
This commit is contained in:
Yuhang Zhao 2020-03-30 21:29:38 +08:00
parent f7968b0aac
commit ae00984a3f
2 changed files with 144 additions and 52 deletions
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180
winnativeeventfilter.cpp
View File

@ -78,7 +78,13 @@ WinNativeEventFilter::WinNativeEventFilter() {
} }
} }
WinNativeEventFilter::~WinNativeEventFilter() = default; WinNativeEventFilter::~WinNativeEventFilter() {
if (!m_data.isEmpty()) {
for (auto data : m_data) {
delete data;
}
}
}
void WinNativeEventFilter::setup() { void WinNativeEventFilter::setup() {
if (instance.isNull()) { if (instance.isNull()) {
@ -129,24 +135,27 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
// Only top level windows can be frameless. // Only top level windows can be frameless.
return false; return false;
} }
if (!m_windowData.contains(msg->hwnd)) { if (!m_data.contains(msg->hwnd)) {
m_windowData.insert(msg->hwnd, qMakePair(FALSE, FALSE)); LPWINDOW _data = new WINDOW;
init(msg->hwnd); _data->hwnd = msg->hwnd;
m_data.insert(msg->hwnd, _data);
init(_data);
} }
const auto data = m_data.value(msg->hwnd);
switch (msg->message) { switch (msg->message) {
case WM_NCCREATE: { case WM_NCCREATE: {
// Work-around a long-existing Windows bug. // Work-around a long-existing Windows bug.
const auto userData = const auto userData =
reinterpret_cast<LPCREATESTRUCTW>(msg->lParam)->lpCreateParams; reinterpret_cast<LPCREATESTRUCTW>(msg->lParam)->lpCreateParams;
SetWindowLongPtrW(msg->hwnd, GWLP_USERDATA, SetWindowLongPtrW(data->hwnd, GWLP_USERDATA,
reinterpret_cast<LONG_PTR>(userData)); reinterpret_cast<LONG_PTR>(userData));
break; break;
} }
case WM_NCCALCSIZE: { case WM_NCCALCSIZE: {
if (static_cast<BOOL>(msg->wParam)) { if (static_cast<BOOL>(msg->wParam)) {
if (IsMaximized(msg->hwnd)) { if (IsMaximized(data->hwnd)) {
const HMONITOR monitor = const HMONITOR monitor =
MonitorFromWindow(msg->hwnd, MONITOR_DEFAULTTONEAREST); MonitorFromWindow(data->hwnd, MONITOR_DEFAULTTONEAREST);
if (monitor) { if (monitor) {
MONITORINFO monitorInfo; MONITORINFO monitorInfo;
SecureZeroMemory(&monitorInfo, sizeof(monitorInfo)); SecureZeroMemory(&monitorInfo, sizeof(monitorInfo));
@ -169,7 +178,7 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
case WM_DWMCOMPOSITIONCHANGED: { case WM_DWMCOMPOSITIONCHANGED: {
// Bring the frame shadow back through DWM. // Bring the frame shadow back through DWM.
// Don't paint the shadow manually using QPainter or QGraphicsEffect. // Don't paint the shadow manually using QPainter or QGraphicsEffect.
handleDwmCompositionChanged(msg->hwnd); handleDwmCompositionChanged(data);
*result = 0; *result = 0;
return true; return true;
} }
@ -182,7 +191,7 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
return true; return true;
} }
case WM_NCPAINT: { case WM_NCPAINT: {
if (m_windowData.value(msg->hwnd).first) { if (data->compositionEnabled) {
break; break;
} else { } else {
// Only block WM_NCPAINT when composition is disabled. If it's // Only block WM_NCPAINT when composition is disabled. If it's
@ -195,23 +204,21 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
case WM_NCACTIVATE: { case WM_NCACTIVATE: {
// DefWindowProc won't repaint the window border if lParam (normally // DefWindowProc won't repaint the window border if lParam (normally
// a HRGN) is -1. // a HRGN) is -1.
*result = DefWindowProcW(msg->hwnd, msg->message, msg->wParam, -1); *result = DefWindowProcW(data->hwnd, msg->message, msg->wParam, -1);
return true; return true;
} }
case WM_NCHITTEST: { case WM_NCHITTEST: {
const auto getHTResult = [this, msg]() -> LRESULT { const auto getHTResult = [this, msg, data]() -> LRESULT {
RECT winRect; const LONG ww = data->width;
GetWindowRect(msg->hwnd, &winRect); const LONG wh = data->height;
const LONG ww = qAbs(winRect.right - winRect.left);
const LONG wh = qAbs(winRect.bottom - winRect.top);
POINT mouse = {LONG(GET_X_LPARAM(msg->lParam)), POINT mouse = {LONG(GET_X_LPARAM(msg->lParam)),
LONG(GET_Y_LPARAM(msg->lParam))}; LONG(GET_Y_LPARAM(msg->lParam))};
ScreenToClient(msg->hwnd, &mouse); ScreenToClient(data->hwnd, &mouse);
// These values are DPI-aware. // These values are DPI-aware.
const LONG bw = borderWidth(msg->hwnd); const LONG bw = borderWidth(data->hwnd);
const LONG bh = borderHeight(msg->hwnd); const LONG bh = borderHeight(data->hwnd);
const LONG tbh = titlebarHeight(msg->hwnd); const LONG tbh = titlebarHeight(data->hwnd);
if (IsMaximized(msg->hwnd)) { if (IsMaximized(data->hwnd)) {
if (mouse.y < tbh) { if (mouse.y < tbh) {
return HTCAPTION; return HTCAPTION;
} }
@ -252,7 +259,7 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
case WM_GETMINMAXINFO: { case WM_GETMINMAXINFO: {
// Don't cover the taskbar when maximized. // Don't cover the taskbar when maximized.
const HMONITOR monitor = const HMONITOR monitor =
MonitorFromWindow(msg->hwnd, MONITOR_DEFAULTTONEAREST); MonitorFromWindow(data->hwnd, MONITOR_DEFAULTTONEAREST);
if (monitor) { if (monitor) {
MONITORINFO monitorInfo; MONITORINFO monitorInfo;
SecureZeroMemory(&monitorInfo, sizeof(monitorInfo)); SecureZeroMemory(&monitorInfo, sizeof(monitorInfo));
@ -279,23 +286,60 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
// composition and theming are disabled. These messages don't paint // composition and theming are disabled. These messages don't paint
// when composition is enabled and blocking WM_NCUAHDRAWCAPTION should // when composition is enabled and blocking WM_NCUAHDRAWCAPTION should
// be enough to prevent painting when theming is enabled. // be enough to prevent painting when theming is enabled.
if (!m_windowData.value(msg->hwnd).first && if (!data->compositionEnabled && !data->themeEnabled) {
!m_windowData.value(msg->hwnd).second) { const LONG_PTR oldStyle = GetWindowLongPtrW(data->hwnd, GWL_STYLE);
const LONG_PTR oldStyle = GetWindowLongPtrW(msg->hwnd, GWL_STYLE);
// Prevent Windows from drawing the default title bar by temporarily // Prevent Windows from drawing the default title bar by temporarily
// toggling the WS_VISIBLE style. // toggling the WS_VISIBLE style.
SetWindowLongPtrW(msg->hwnd, GWL_STYLE, oldStyle & ~WS_VISIBLE); SetWindowLongPtrW(data->hwnd, GWL_STYLE, oldStyle & ~WS_VISIBLE);
const LRESULT ret = DefWindowProcW(msg->hwnd, msg->message, const LRESULT ret = DefWindowProcW(data->hwnd, msg->message,
msg->wParam, msg->lParam); msg->wParam, msg->lParam);
SetWindowLongPtrW(msg->hwnd, GWL_STYLE, oldStyle); SetWindowLongPtrW(data->hwnd, GWL_STYLE, oldStyle);
*result = ret; *result = ret;
return true; return true;
} }
break; break;
} }
case WM_THEMECHANGED: { case WM_THEMECHANGED: {
const BOOL dwm = m_windowData.value(msg->hwnd).first; data->themeEnabled = IsThemeActive();
m_windowData[msg->hwnd] = qMakePair(dwm, IsThemeActive()); break;
}
case WM_WINDOWPOSCHANGED: {
RECT client;
GetClientRect(data->hwnd, &client);
const UINT old_width = data->width;
const UINT old_height = data->height;
data->width = client.right;
data->height = client.bottom;
const bool client_changed =
(data->width != old_width) || (data->height != old_height);
if (client_changed ||
(reinterpret_cast<const LPWINDOWPOS>(msg->lParam)->flags &
SWP_FRAMECHANGED)) {
updateRegion(data);
}
if (client_changed) {
// Invalidate the changed parts of the rectangle drawn in WM_PAINT.
RECT rect;
if (data->width > old_width) {
rect = {LONG(old_width - 1), 0, LONG(old_width),
LONG(old_height)};
} else {
rect = {LONG(data->width - 1), 0, LONG(data->width),
LONG(data->height)};
}
if (data->height > old_height) {
rect = {0, LONG(old_height - 1), LONG(old_width),
LONG(old_height)};
} else {
rect = {0, LONG(data->height - 1), LONG(data->width),
LONG(data->height)};
}
InvalidateRect(data->hwnd, &rect, TRUE);
}
*result = 0;
// Don't return true here because return true means we'll take over
// the whole event from Qt and thus it will block Qt's paint events and
// the window will not update itself anymore in the end.
break; break;
} }
default: default:
@ -304,36 +348,76 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
return false; return false;
} }
void WinNativeEventFilter::init(HWND handle) { void WinNativeEventFilter::init(LPWINDOW data) {
// Make sure our window is a normal application window, we'll remove the // 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. // window frame later in Win32 events, don't use WS_POPUP to do this.
SetWindowLongPtrW(handle, GWL_STYLE, WS_OVERLAPPEDWINDOW); SetWindowLongPtrW(data->hwnd, GWL_STYLE, WS_OVERLAPPEDWINDOW);
SetWindowLongPtrW(handle, GWL_EXSTYLE, WS_EX_APPWINDOW | WS_EX_LAYERED); SetWindowLongPtrW(data->hwnd, GWL_EXSTYLE, WS_EX_APPWINDOW | WS_EX_LAYERED);
// Make the window a layered window so the legacy GDI API can be used to // 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: // 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, // This is not necessary if other drawing APIs are used, eg. GDI+, OpenGL,
// Direct2D, Direct3D, DirectComposition, etc. // Direct2D, Direct3D, DirectComposition, etc.
SetLayeredWindowAttributes(handle, RGB(255, 0, 255), 0, LWA_COLORKEY); SetLayeredWindowAttributes(data->hwnd, RGB(255, 0, 255), 0, LWA_COLORKEY);
// Make sure our window has the frame shadow. // Make sure our window has the frame shadow.
handleDwmCompositionChanged(handle); handleDwmCompositionChanged(data);
// Tell the window to redraw itself. // Tell the window to redraw itself.
SetWindowPos(handle, nullptr, 0, 0, 0, 0, SetWindowPos(data->hwnd, nullptr, 0, 0, 0, 0,
SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOMOVE | SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOMOVE |
SWP_NOOWNERZORDER | SWP_NOSIZE | SWP_NOZORDER); SWP_NOOWNERZORDER | SWP_NOSIZE | SWP_NOZORDER);
// For debug purposes. // For debug purposes.
qDebug().noquote() << "Window handle:" << handle; qDebug().noquote() << "Window handle:" << data->hwnd;
qDebug().noquote() << "Window DPI:" << windowDpi(handle) qDebug().noquote() << "Window DPI:" << windowDpi(data->hwnd)
<< "Window DPR:" << windowDpr(handle); << "Window DPR:" << windowDpr(data->hwnd);
qDebug().noquote() << "Window border width:" << borderWidth(handle) qDebug().noquote() << "Window border width:" << borderWidth(data->hwnd)
<< "Window border height:" << borderHeight(handle) << "Window border height:" << borderHeight(data->hwnd)
<< "Window titlebar height:" << titlebarHeight(handle); << "Window titlebar height:"
<< titlebarHeight(data->hwnd);
} }
void WinNativeEventFilter::handleDwmCompositionChanged(HWND handle) { void WinNativeEventFilter::updateRegion(LPWINDOW data) {
const RECT old_rgn = data->region;
const RECT null_rgn = {0, 0, 0, 0};
if (IsMaximized(data->hwnd)) {
WINDOWINFO wi;
SecureZeroMemory(&wi, sizeof(wi));
wi.cbSize = sizeof(wi);
GetWindowInfo(data->hwnd, &wi);
// For maximized windows, a region is needed to cut off the
// non-client borders that hang over the edge of the screen.
data->region.left = wi.rcClient.left - wi.rcWindow.left;
data->region.top = wi.rcClient.top - wi.rcWindow.top;
data->region.right = wi.rcClient.right - wi.rcWindow.left;
data->region.bottom = wi.rcClient.bottom - wi.rcWindow.top;
} else if (!data->compositionEnabled) {
// For ordinary themed windows when composition is disabled, a
// region is needed to remove the rounded top corners. Make it as
// large as possible to avoid having to change it when the window is
// resized.
data->region.left = 0;
data->region.top = 0;
data->region.right = 32767;
data->region.bottom = 32767;
} else {
// Don't mess with the region when composition is enabled and the
// window is not maximized, otherwise it will lose its shadow.
data->region = null_rgn;
}
// Avoid unnecessarily updating the region to avoid unnecessary redraws.
if (EqualRect(&data->region, &old_rgn)) {
return;
}
// Treat empty regions as NULL regions.
if (EqualRect(&data->region, &null_rgn)) {
SetWindowRgn(data->hwnd, nullptr, TRUE);
} else {
SetWindowRgn(data->hwnd, CreateRectRgnIndirect(&data->region), TRUE);
}
}
void WinNativeEventFilter::handleDwmCompositionChanged(LPWINDOW data) {
BOOL enabled = FALSE; BOOL enabled = FALSE;
DwmIsCompositionEnabled(&enabled); DwmIsCompositionEnabled(&enabled);
const BOOL theme = m_windowData.value(handle).second; data->compositionEnabled = enabled;
m_windowData[handle] = qMakePair(enabled, theme);
WTA_OPTIONS options; WTA_OPTIONS options;
options.dwMask = WTNCA_NODRAWCAPTION | WTNCA_NODRAWICON; options.dwMask = WTNCA_NODRAWCAPTION | WTNCA_NODRAWICON;
// We should not draw the frame shadow if DWM composition is disabled, in // We should not draw the frame shadow if DWM composition is disabled, in
@ -346,16 +430,18 @@ void WinNativeEventFilter::handleDwmCompositionChanged(HWND handle) {
// The frame shadow is drawn on the non-client area and thus we have to // 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. // make sure the non-client area rendering is enabled first.
const DWMNCRENDERINGPOLICY ncrp = DWMNCRP_ENABLED; const DWMNCRENDERINGPOLICY ncrp = DWMNCRP_ENABLED;
DwmSetWindowAttribute(handle, DWMWA_NCRENDERING_POLICY, &ncrp, DwmSetWindowAttribute(data->hwnd, DWMWA_NCRENDERING_POLICY, &ncrp,
sizeof(ncrp)); sizeof(ncrp));
// Negative margins have special meaning to // Negative margins have special meaning to
// DwmExtendFrameIntoClientArea. Negative margins create the "sheet of // DwmExtendFrameIntoClientArea. Negative margins create the "sheet of
// glass" effect, where the client area is rendered as a solid surface // glass" effect, where the client area is rendered as a solid surface
// with no window border. // with no window border.
const MARGINS margins = {-1, -1, -1, -1}; const MARGINS margins = {-1, -1, -1, -1};
DwmExtendFrameIntoClientArea(handle, &margins); DwmExtendFrameIntoClientArea(data->hwnd, &margins);
} }
SetWindowThemeAttribute(handle, WTA_NONCLIENT, &options, sizeof(options)); SetWindowThemeAttribute(data->hwnd, WTA_NONCLIENT, &options,
sizeof(options));
updateRegion(data);
} }
UINT WinNativeEventFilter::getDpiForWindow(HWND handle) const { UINT WinNativeEventFilter::getDpiForWindow(HWND handle) const {

16
winnativeeventfilter.h
View File

@ -2,13 +2,19 @@
#include <QAbstractNativeEventFilter> #include <QAbstractNativeEventFilter>
#include <QHash> #include <QHash>
#include <QPair>
#include <qt_windows.h> #include <qt_windows.h>
class WinNativeEventFilter : public QAbstractNativeEventFilter { class WinNativeEventFilter : public QAbstractNativeEventFilter {
Q_DISABLE_COPY_MOVE(WinNativeEventFilter) Q_DISABLE_COPY_MOVE(WinNativeEventFilter)
public: public:
typedef struct tagWINDOW {
HWND hwnd = nullptr;
UINT width = 0, height = 0;
RECT region = {0, 0, 0, 0};
BOOL compositionEnabled = FALSE, themeEnabled = FALSE;
} WINDOW, *LPWINDOW;
explicit WinNativeEventFilter(); explicit WinNativeEventFilter();
~WinNativeEventFilter() override; ~WinNativeEventFilter() override;
@ -29,8 +35,9 @@ public:
#endif #endif
private: private:
void init(HWND handle); void init(LPWINDOW data);
void handleDwmCompositionChanged(HWND handle); void updateRegion(LPWINDOW data);
void handleDwmCompositionChanged(LPWINDOW data);
UINT getDpiForWindow(HWND handle) const; UINT getDpiForWindow(HWND handle) const;
qreal getDprForWindow(HWND handle) const; qreal getDprForWindow(HWND handle) const;
int getSystemMetricsForWindow(HWND handle, int index) const; int getSystemMetricsForWindow(HWND handle, int index) const;
@ -44,8 +51,7 @@ private:
MDT_RAW_DPI = 2, MDT_RAW_DPI = 2,
MDT_DEFAULT = MDT_EFFECTIVE_DPI MDT_DEFAULT = MDT_EFFECTIVE_DPI
}; };
// Window handle, DwmComposition, Theme QHash<HWND, LPWINDOW> m_data;
QHash<HWND, QPair<BOOL, BOOL>> m_windowData;
const UINT m_defaultDPI = 96; const UINT m_defaultDPI = 96;
const qreal m_defaultDPR = 1.0; const qreal m_defaultDPR = 1.0;
using lpGetSystemDpiForProcess = UINT(WINAPI *)(HANDLE); using lpGetSystemDpiForProcess = UINT(WINAPI *)(HANDLE);