ac81827ed8
When a native/foreign window is used as a parent, its WS_CLIPSCHILDREN style should be enabled. If it is not, the parent will paint on top of the children and cause flickering. It is not Qt's responsiblity to adjust the styles of foreign windows, so instead we document this in the manual test. Change-Id: I84bc25668d702c3475dfbd75a94dd3ed43a1695c Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io> (cherry picked from commit a645128c296756ea6c7e70259958a0d000d029e5) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
120 lines
3.9 KiB
C++
120 lines
3.9 KiB
C++
// Copyright (C) 2023 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
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#include <QtGui>
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#if QT_CONFIG(metal) || defined(Q_OS_WIN) || QT_CONFIG(xcb) || defined(ANDROID)
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#include "../../shared/nativewindow.h"
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#define HAVE_NATIVE_WINDOW
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#endif
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#include <QDebug>
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class TestWindow : public QRasterWindow
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{
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public:
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using QRasterWindow::QRasterWindow;
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TestWindow(const QBrush &brush) : m_brush(brush) {}
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protected:
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void mousePressEvent(QMouseEvent *) override
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{
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m_pressed = true;
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update();
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}
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void mouseReleaseEvent(QMouseEvent *) override
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{
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m_pressed = false;
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update();
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}
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void paintEvent(QPaintEvent *) override
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{
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QPainter painter(this);
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painter.setCompositionMode(QPainter::CompositionMode_Source);
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if (!mask().isNull())
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painter.setClipRegion(mask());
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painter.fillRect(QRect(0, 0, width(), height()),
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m_pressed ? QGradient(QGradient::JuicyPeach) : m_brush);
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}
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private:
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QBrush m_brush = QGradient(QGradient::DustyGrass);
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bool m_pressed = false;
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};
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int main(int argc, char *argv[])
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{
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QGuiApplication app(argc, argv);
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TestWindow window{QGradient(QGradient::WinterNeva)};
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window.resize(500, 500);
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TestWindow *opaqueChildWindow = new TestWindow;
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opaqueChildWindow->setParent(&window);
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opaqueChildWindow->setGeometry(50, 50, 100, 100);
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opaqueChildWindow->showNormal();
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TestWindow *maskedChildWindow = new TestWindow;
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maskedChildWindow->setParent(&window);
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maskedChildWindow->setGeometry(200, 50, 100, 100);
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maskedChildWindow->setMask(QRegion(0, 0, 100, 100, QRegion::Ellipse));
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maskedChildWindow->showNormal();
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static const QColor transparentGreen = QColor(0, 255, 0, 20);
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TestWindow *transparentChildWindow = new TestWindow(transparentGreen);
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// The default surface format of a platform may not include
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// an alpha, so set it explicitly.
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QSurfaceFormat format = transparentChildWindow->format();
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format.setAlphaBufferSize(8);
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transparentChildWindow->setFormat(format);
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// FIXME: Windows requires this, even for child windows
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transparentChildWindow->setFlag(Qt::FramelessWindowHint);
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transparentChildWindow->setParent(&window);
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transparentChildWindow->setGeometry(350, 50, 100, 100);
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transparentChildWindow->showNormal();
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#if defined(HAVE_NATIVE_WINDOW)
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NativeWindow nativeWindow;
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if (QWindow *foreignWindow = QWindow::fromWinId(nativeWindow)) {
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foreignWindow->setParent(&window);
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foreignWindow->setGeometry(50, 200, 100, 100);
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foreignWindow->showNormal();
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}
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NativeWindow maskedNativeWindow;
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if (QWindow *foreignWindow = QWindow::fromWinId(maskedNativeWindow)) {
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foreignWindow->setParent(&window);
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foreignWindow->setGeometry(200, 200, 100, 100);
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foreignWindow->setMask(QRegion(0, 0, 100, 100, QRegion::Ellipse));
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foreignWindow->showNormal();
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}
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NativeWindow nativeParentWindow;
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if (QWindow *foreignWindow = QWindow::fromWinId(nativeParentWindow)) {
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#ifdef Q_OS_WIN
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// Native parent windows should have WS_CLIPCHILDREN style set
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// to prevent overdrawing child area and cause flickering.
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const HWND hwnd = reinterpret_cast<HWND>(foreignWindow->winId());
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const LONG_PTR oldStyle = GetWindowLongPtr(hwnd, GWL_STYLE);
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SetWindowLongPtr(hwnd, GWL_STYLE, oldStyle | WS_CLIPCHILDREN);
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#endif
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foreignWindow->setParent(&window);
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foreignWindow->setGeometry(50, 350, 100, 100);
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foreignWindow->showNormal();
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TestWindow *maskedChildWindowOfNativeWindow = new TestWindow;
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maskedChildWindowOfNativeWindow->setParent(foreignWindow);
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maskedChildWindowOfNativeWindow->setGeometry(25, 25, 50, 50);
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maskedChildWindowOfNativeWindow->showNormal();
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}
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#endif
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window.show();
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return app.exec();
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}
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