119 lines
3.9 KiB
C++
119 lines
3.9 KiB
C++
#include "framelesswindow.h"
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#include <QApplication>
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#include <QVBoxLayout>
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#ifdef _WIN32
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#include <windows.h>
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#endif // _WIN32
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FramelessWindow::FramelessWindow(QWidget *parent)
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: QWidget(parent)
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, m_centralLayout(new QVBoxLayout(this))
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{
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// A frameless window has the Qt::WindowTitleHint flag seems wrong,
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// but it's a workaround of the following bug (also see the focused comment):
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// https://bugreports.qt.io/browse/QTBUG-8361?focusedCommentId=542002#comment-542002
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this->setWindowFlags(Qt::Window | Qt::WindowTitleHint | Qt::WindowMinMaxButtonsHint | Qt::FramelessWindowHint);
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m_centralLayout->setMargin(0);
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}
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void FramelessWindow::setCentralWidget(QWidget *widget)
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{
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if (m_centralWidget) {
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m_centralLayout->removeWidget(m_centralWidget);
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m_centralWidget->deleteLater();
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}
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m_centralLayout->addWidget(widget);
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m_centralWidget = widget;
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}
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bool FramelessWindow::nativeEvent(const QByteArray &eventType, void *message, long *result)
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{
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#ifdef _WIN32
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// https://stackoverflow.com/questions/43505580/qt-windows-resizable-frameless-window
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// Too lazy to do this now.. just stackoverflow it and did a copy and paste..
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Q_UNUSED(eventType)
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MSG* msg = static_cast<MSG*>(message);
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if (msg->message == WM_NCHITTEST) {
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if (isMaximized()) {
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return false;
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}
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*result = 0;
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const LONG borderWidth = 8;
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RECT winrect;
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GetWindowRect(reinterpret_cast<HWND>(winId()), &winrect);
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// must be short to correctly work with multiple monitors (negative coordinates)
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short x = msg->lParam & 0x0000FFFF;
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short y = (msg->lParam & 0xFFFF0000) >> 16;
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bool resizeWidth = minimumWidth() != maximumWidth();
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bool resizeHeight = minimumHeight() != maximumHeight();
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if (resizeWidth) {
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//left border
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if (x >= winrect.left && x < winrect.left + borderWidth) {
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*result = HTLEFT;
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}
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//right border
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if (x < winrect.right && x >= winrect.right - borderWidth) {
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*result = HTRIGHT;
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}
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}
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if (resizeHeight) {
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//bottom border
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if (y < winrect.bottom && y >= winrect.bottom - borderWidth) {
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*result = HTBOTTOM;
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}
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//top border
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if (y >= winrect.top && y < winrect.top + borderWidth) {
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*result = HTTOP;
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}
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}
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if (resizeWidth && resizeHeight) {
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//bottom left corner
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if (x >= winrect.left && x < winrect.left + borderWidth &&
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y < winrect.bottom && y >= winrect.bottom - borderWidth)
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{
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*result = HTBOTTOMLEFT;
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}
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//bottom right corner
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if (x < winrect.right && x >= winrect.right - borderWidth &&
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y < winrect.bottom && y >= winrect.bottom - borderWidth)
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{
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*result = HTBOTTOMRIGHT;
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}
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//top left corner
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if (x >= winrect.left && x < winrect.left + borderWidth &&
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y >= winrect.top && y < winrect.top + borderWidth)
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{
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*result = HTTOPLEFT;
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}
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//top right corner
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if (x < winrect.right && x >= winrect.right - borderWidth &&
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y >= winrect.top && y < winrect.top + borderWidth)
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{
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*result = HTTOPRIGHT;
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}
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}
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if (*result != 0)
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return true;
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QWidget *action = QApplication::widgetAt(QCursor::pos());
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if (action == this) {
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*result = HTCAPTION;
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return true;
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}
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}
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return false;
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#else
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return QWidget::nativeEvent(eventType, message, result);
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#endif // _WIN32
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}
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