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// SPDX-FileCopyrightText: 2022 Gary Wang <wzc782970009@gmail.com>
// SPDX-FileCopyrightText: 2023 Tad Young <yyc12321@outlook.com>
//
// SPDX-License-Identifier: MIT
#include "framelesswindow.h"
#include <QMouseEvent>
#include <QHoverEvent>
#include <QApplication>
#include <QVBoxLayout>
#include <QWindow>
FramelessWindow::FramelessWindow(QWidget *parent)
: QWidget(parent)
, m_centralLayout(new QVBoxLayout(this))
, m_oldCursorShape(Qt::ArrowCursor)
, m_oldEdges()
{
this->setWindowFlags(Qt::Window | Qt::FramelessWindowHint | Qt::WindowMinMaxButtonsHint);
this->setMouseTracking(true);
this->setAttribute(Qt::WA_Hover, true);
this->installEventFilter(this);
m_centralLayout->setContentsMargins(QMargins());
}
void FramelessWindow::setCentralWidget(QWidget *widget)
{
if (m_centralWidget) {
m_centralLayout->removeWidget(m_centralWidget);
m_centralWidget->deleteLater();
}
m_centralLayout->addWidget(widget);
m_centralWidget = widget;
}
void FramelessWindow::installResizeCapture(QObject* widget)
{
widget->installEventFilter(this);
}
bool FramelessWindow::eventFilter(QObject* o, QEvent* e)
{
switch (e->type()) {
case QEvent::HoverMove:
{
QWidget* wg = qobject_cast<QWidget*>(o);
if (wg != nullptr)
return mouseHover(static_cast<QHoverEvent*>(e), wg);
break;
}
case QEvent::MouseButtonPress:
return mousePress(static_cast<QMouseEvent*>(e));
}
return QWidget::eventFilter(o, e);
}
bool FramelessWindow::mouseHover(QHoverEvent* event, QWidget* wg)
{
if (!isMaximized() && !isFullScreen()) {
QWindow* win = window()->windowHandle();
Qt::Edges edges = this->getEdgesByPos(wg->mapToGlobal(event->oldPos()), win->frameGeometry());
// backup & restore cursor shape
if (edges && !m_oldEdges)
// entering the edge. backup cursor shape
m_oldCursorShape = win->cursor().shape();
if (!edges && m_oldEdges)
// leaving the edge. restore cursor shape
win->setCursor(m_oldCursorShape);
// save the latest edges status
m_oldEdges = edges;
// show resize cursor shape if cursor is within border
if (edges) {
win->setCursor(this->getCursorByEdge(edges, Qt::ArrowCursor));
return true;
}
}
return false;
}
bool FramelessWindow::mousePress(QMouseEvent* event)
{
if (event->buttons() & Qt::LeftButton && !isMaximized() && !isFullScreen()) {
QWindow* win = window()->windowHandle();
Qt::Edges edges = this->getEdgesByPos(event->globalPosition().toPoint(), win->frameGeometry());
if (edges) {
win->startSystemResize(edges);
return true;
}
}
return false;
}
Qt::CursorShape FramelessWindow::getCursorByEdge(const Qt::Edges& edges, Qt::CursorShape default_cursor)
{
if ((edges == (Qt::TopEdge | Qt::LeftEdge)) || (edges == (Qt::RightEdge | Qt::BottomEdge)))
return Qt::SizeFDiagCursor;
else if ((edges == (Qt::TopEdge | Qt::RightEdge)) || (edges == (Qt::LeftEdge | Qt::BottomEdge)))
return Qt::SizeBDiagCursor;
else if (edges & (Qt::TopEdge | Qt::BottomEdge))
return Qt::SizeVerCursor;
else if (edges & (Qt::LeftEdge | Qt::RightEdge))
return Qt::SizeHorCursor;
else
return default_cursor;
}
Qt::Edges FramelessWindow::getEdgesByPos(const QPoint gpos, const QRect& winrect)
{
const int borderWidth = 8;
Qt::Edges edges;
int x = gpos.x() - winrect.x();
int y = gpos.y() - winrect.y();
if (x < borderWidth)
edges |= Qt::LeftEdge;
if (x > (winrect.width() - borderWidth))
edges |= Qt::RightEdge;
if (y < borderWidth)
edges |= Qt::TopEdge;
if (y > (winrect.height() - borderWidth))
edges |= Qt::BottomEdge;
return edges;
}
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