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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 2020-04-12 20:54:58 +08:00
parent 7f1f2dffc3
commit eefb3feb44
4 changed files with 84 additions and 25 deletions
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25
BUGS.md Normal file
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@ -0,0 +1,25 @@
# 已知问题
## 拖拽窗口边框时窗口内容不能及时跟随，能看到窗口的白底
- 复现步骤：运行使用了样式表的*QWidget*程序（不使用样式表则无此问题）；运行任意*Qt Quick*程序
- 原因：暂时未知
- 解决方案：对于*QWidget*程序，可以启用`Qt::WA_NoSystemBackground`属性，来禁用窗口默认的白色背景，但窗口背景会变成黑色，且无法改变，如果程序使用深色主题，则无大碍，如果使用浅色主题，体验应该不会太好。*Qt Quick*程序暂时无解。
## 拖拽窗口边框时能看到右上角的三个系统按钮/自绘内容消失（变白）
- 复现步骤：在窗口构造前执行`WinNativeEventFilter::install()`函数
- 原因：暂时未知
- 解决方案：不要全局安装过滤器，应针对每一个窗口，单独调用`addFramelessWindow`函数
## 自绘内容（例如D3D）错位或不能及时刷新
- 复现步骤：在窗口中放置一个完全由Windows API绘制的控件
- 原因：暂时未知
- 解决方案：暂无
## resize后发现尺寸不对
- 复现步骤：在构造函数中调用`resize`函数；在安装过滤器之前调用`resize`函数
- 原因：构造函数中获取的几何位置和大小是不准确的；调用`resize`这一类的函数时，Qt默认会考虑边框和标题栏的宽度，但安装过滤器后，边框和标题栏没了，所以尺寸就不对了
- 解决方案：在控件或窗口显示出来以后再去获取或设置它们的几何位置及尺寸；先安装过滤器，再调整尺寸。

45
framelesshelper.cpp
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@ -28,7 +28,9 @@
#include <QGuiApplication>
#include <QMargins>
#include <QVariant>
#ifdef QT_WIDGETS_LIB
#include <QWidget>
#endif
#include <QWindow>
#include <qpa/qplatformnativeinterface.h>
@ -37,8 +39,10 @@
#else
#include <QEvent>
#include <QMouseEvent>
#ifdef QT_WIDGETS_LIB
#include <QStyle>
#include <QStyleOption>
#endif
#include <QTouchEvent>
#endif
@ -58,6 +62,7 @@ FramelessHelper::FramelessHelper(QObject *parent) : QObject(parent) {
// is 96. Don't know how to acquire these values on UNIX platforms.
m_borderWidth = 8;
m_borderHeight = 8;
#ifdef QT_WIDGETS_LIB
QWidget widget;
QStyleOption styleOption;
styleOption.initFrom(&widget);
@ -65,6 +70,9 @@ FramelessHelper::FramelessHelper(QObject *parent) : QObject(parent) {
widget.style()->pixelMetric(QStyle::PixelMetric::PM_TitleBarHeight,
&styleOption) +
m_borderHeight;
#else
m_titlebarHeight = 30 + m_borderHeight;
#endif
qDebug().noquote() << "Window device pixel ratio:"
<< widget.devicePixelRatioF();
qDebug().noquote() << "Window border width:" << m_borderWidth
@ -208,7 +216,9 @@ void FramelessHelper::setFramelessWindows(const QVector<QObject *> &val) {
window->setFlags(flags);
// MouseTracking is always enabled for QWindow.
window->installEventFilter(this);
} else {
}
#ifdef QT_WIDGETS_LIB
else {
const auto widget = qobject_cast<QWidget *>(object);
if (widget) {
widget->setWindowFlags(flags);
@ -218,6 +228,7 @@ void FramelessHelper::setFramelessWindows(const QVector<QObject *> &val) {
widget->installEventFilter(this);
}
}
#endif
#endif
}
}
@ -230,11 +241,14 @@ void FramelessHelper::setFramelessWindows(const QVector<QObject *> &val) {
bool FramelessHelper::eventFilter(QObject *object, QEvent *event) {
const auto isWindowTopLevel = [](QObject *window) -> bool {
if (window) {
if (window->isWidgetType()) {
return qobject_cast<QWidget *>(window)->isTopLevel();
} else if (window->isWindowType()) {
if (window->isWindowType()) {
return qobject_cast<QWindow *>(window)->isTopLevel();
}
#ifdef QT_WIDGETS_LIB
else if (window->isWidgetType()) {
return qobject_cast<QWidget *>(window)->isTopLevel();
}
#endif
}
return false;
};
@ -367,7 +381,9 @@ bool FramelessHelper::eventFilter(QObject *object, QEvent *event) {
}
window->setCursor(Qt::CursorShape::ArrowCursor);
}
} else if (object->isWidgetType()) {
}
#ifdef QT_WIDGETS_LIB
else if (object->isWidgetType()) {
const auto widget = qobject_cast<QWidget *>(object);
if (widget) {
if (widget->isFullScreen()) {
@ -381,6 +397,7 @@ bool FramelessHelper::eventFilter(QObject *object, QEvent *event) {
widget->setCursor(Qt::CursorShape::ArrowCursor);
}
}
#endif
}
}
break;
@ -406,7 +423,9 @@ bool FramelessHelper::eventFilter(QObject *object, QEvent *event) {
getWindowEdges(mouseEvent->localPos(), window->width(),
window->height())));
}
} else {
}
#ifdef QT_WIDGETS_LIB
else {
const auto widget = qobject_cast<QWidget *>(object);
if (widget) {
if (!widget->isMinimized() && !widget->isMaximized() &&
@ -417,6 +436,7 @@ bool FramelessHelper::eventFilter(QObject *object, QEvent *event) {
}
}
}
#endif
}
break;
}
@ -443,12 +463,16 @@ QWindow *FramelessHelper::getWindowHandle(QObject *val) {
};
if (val->isWindowType()) {
return validWindow(qobject_cast<QWindow *>(val));
} else if (val->isWidgetType()) {
}
#ifdef QT_WIDGETS_LIB
else if (val->isWidgetType()) {
const auto widget = qobject_cast<QWidget *>(val);
if (widget) {
return validWindow(widget->windowHandle());
}
} else {
}
#endif
else {
qWarning().noquote() << "Can't acquire the window handle: only "
"QWidget and QWindow are accepted.";
}
@ -480,12 +504,15 @@ void *FramelessHelper::getWindowRawHandle(QObject *object) {
if (handle) {
return handle;
}
} else {
}
#ifdef QT_WIDGETS_LIB
else {
const auto widget = qobject_cast<QWidget *>(object);
if (widget) {
return reinterpret_cast<void *>(widget->winId());
}
}
#endif
}
return nullptr;
}

3
main.cpp
View File

@ -18,11 +18,14 @@ int main(int argc, char *argv[]) {
#endif
#endif
QCoreApplication::setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
QApplication application(argc, argv);
FramelessHelper helper;
QWidget widget;
widget.setAttribute(Qt::WA_DontCreateNativeAncestors);
helper.setFramelessWindows({&widget});
widget.show();

36
winnativeeventfilter.cpp
View File

@ -251,6 +251,20 @@ BOOL IsFullScreened(HWND handle) {
return FALSE;
}
BOOL IsWindowTopLevel(HWND handle) {
if (handle && m_lpIsWindow(handle)) {
if (m_lpGetWindowLongPtrW(handle, GWL_STYLE) & WS_CHILD) {
return FALSE;
}
const HWND parent = m_lpGetAncestor(handle, GA_PARENT);
if (parent && (parent != m_lpGetDesktopWindow())) {
return FALSE;
}
return TRUE;
}
return FALSE;
}
// The thickness of an auto-hide taskbar in pixels.
const int kAutoHideTaskbarThicknessPx = 2;
const int kAutoHideTaskbarThicknessPy = kAutoHideTaskbarThicknessPx;
@ -400,13 +414,7 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
}
if (m_framelessWindows.isEmpty()) {
// Only top level windows can be frameless.
// Try to avoid this case because it will result in strange behavior,
// use addFramelessWindow if possible.
if (m_lpGetWindowLongPtrW(msg->hwnd, GWL_STYLE) & WS_CHILD) {
return false;
}
const HWND parent = m_lpGetAncestor(msg->hwnd, GA_PARENT);
if (parent && (parent != m_lpGetDesktopWindow())) {
if (!IsWindowTopLevel(msg->hwnd)) {
return false;
}
} else if (!m_framelessWindows.contains(msg->hwnd)) {
@ -456,7 +464,7 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
// window. On exit, the structure should contain the screen coordinates
// of the corresponding window client area.
const auto getClientAreaInsets = [](HWND _hWnd) -> RECT {
if (IsMaximized(_hWnd)) {
if (IsMaximized(_hWnd) || IsFullScreened(_hWnd)) {
// Windows automatically adds a standard width border to all
// sides when a window is maximized.
int frameThickness_x = borderWidth(_hWnd);
@ -520,17 +528,13 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
m_lpSHAppBarMessage(ABM_GETAUTOHIDEBAREX, &_abd));
return hTaskbar != nullptr;
};
const bool onTop = hasAutohideTaskbar(ABE_TOP);
const bool onBottom = hasAutohideTaskbar(ABE_BOTTOM);
const bool onLeft = hasAutohideTaskbar(ABE_LEFT);
const bool onRight = hasAutohideTaskbar(ABE_RIGHT);
if (onTop) {
if (hasAutohideTaskbar(ABE_TOP)) {
clientRect->top += kAutoHideTaskbarThicknessPy;
} else if (onBottom) {
} else if (hasAutohideTaskbar(ABE_BOTTOM)) {
clientRect->bottom -= kAutoHideTaskbarThicknessPy;
} else if (onLeft) {
} else if (hasAutohideTaskbar(ABE_LEFT)) {
clientRect->left += kAutoHideTaskbarThicknessPx;
} else if (onRight) {
} else if (hasAutohideTaskbar(ABE_RIGHT)) {
clientRect->right -= kAutoHideTaskbarThicknessPx;
}
}