Qt 自定义界面（窗体缩放-跨平台终极版） 无边框 frameless helper widget

#include <QWidget> #include <QMouseEvent> #include <QEvent> #include <QRubberBand> #include "WidgetData.h" #include "FramelessHelperPrivate.h" /***** WidgetData *****/ WidgetData::WidgetData(FramelessHelperPrivate *_d, QWidget *pTopLevelWidget) { d = _d; m_pWidget = pTopLevelWidget; m_bLeftButtonPressed = false; m_bCursorShapeChanged = false; m_bLeftButtonTitlePressed = false; m_pRubberBand = NULL; m_windowFlags = m_pWidget->windowFlags(); m_pWidget->setMouseTracking(true); m_pWidget->setAttribute(Qt::WA_Hover, true); updateRubberBandStatus(); } WidgetData::~WidgetData() { m_pWidget->setMouseTracking(false); m_pWidget->setWindowFlags(m_windowFlags); m_pWidget->setAttribute(Qt::WA_Hover, false); delete m_pRubberBand; m_pRubberBand = NULL; } QWidget* WidgetData::widget() { return m_pWidget; } void WidgetData::handleWidgetEvent(QEvent *event) { switch (event->type()) { default: break; case QEvent::MouseButtonPress: handleMousePressEvent(static_cast<QMouseEvent*>(event)); break; case QEvent::MouseButtonRelease: handleMouseReleaseEvent(static_cast<QMouseEvent*>(event)); break; case QEvent::MouseMove: handleMouseMoveEvent(static_cast<QMouseEvent*>(event)); break; case QEvent::Leave: handleLeaveEvent(static_cast<QMouseEvent*>(event)); break; case QEvent::HoverMove: handleHoverMoveEvent(static_cast<QHoverEvent*>(event)); break; } } void WidgetData::updateRubberBandStatus() { if (d->m_bRubberBandOnMove || d->m_bRubberBandOnResize) { if (NULL == m_pRubberBand) m_pRubberBand = new QRubberBand(QRubberBand::Rectangle); } else { delete m_pRubberBand; m_pRubberBand = NULL; } } void WidgetData::updateCursorShape(const QPoint &gMousePos) { if (m_pWidget->isFullScreen() || m_pWidget->isMaximized()) { if (m_bCursorShapeChanged) { m_pWidget->unsetCursor(); m_bCursorShapeChanged = false; } return; } m_moveMousePos.recalculate(gMousePos, m_pWidget->frameGeometry()); if (d->m_bWidgetResizable) { if (m_moveMousePos.m_bOnTopLeftEdge || m_moveMousePos.m_bOnBottomRightEdge) { m_pWidget->setCursor(Qt::SizeFDiagCursor); m_bCursorShapeChanged = true; return; } else if (m_moveMousePos.m_bOnTopRightEdge || m_moveMousePos.m_bOnBottomLeftEdge) { m_pWidget->setCursor(Qt::SizeBDiagCursor); m_bCursorShapeChanged = true; return; } else if (m_moveMousePos.m_bOnLeftEdge || m_moveMousePos.m_bOnRightEdge) { m_pWidget->setCursor(Qt::SizeHorCursor); m_bCursorShapeChanged = true; return; } else if (m_moveMousePos.m_bOnTopEdge || m_moveMousePos.m_bOnBottomEdge) { m_pWidget->setCursor(Qt::SizeVerCursor); m_bCursorShapeChanged = true; return; } } if (d->m_bWidgetMovable) { if (m_moveMousePos.m_bOnTitle) { m_pWidget->setCursor(Qt::SizeAllCursor); m_bCursorShapeChanged = true; return; } } if (m_bCursorShapeChanged) { m_pWidget->unsetCursor(); m_bCursorShapeChanged = false; } } void WidgetData::resizeWidget(const QPoint &gMousePos) { QRect origRect; if (d->m_bRubberBandOnResize) origRect = m_pRubberBand->frameGeometry(); else origRect = m_pWidget->frameGeometry(); int left = origRect.left(); int top = origRect.top(); int right = origRect.right(); int bottom = origRect.bottom(); origRect.getCoords(&left, &top, &right, &bottom); int minWidth = m_pWidget->minimumWidth(); int minHeight = m_pWidget->minimumHeight(); if (m_pressedMousePos.m_bOnTopLeftEdge) { left = gMousePos.x(); top = gMousePos.y(); } else if (m_pressedMousePos.m_bOnBottomLeftEdge) { left = gMousePos.x(); bottom = gMousePos.y(); } else if (m_pressedMousePos.m_bOnTopRightEdge) { right = gMousePos.x(); top = gMousePos.y(); } else if (m_pressedMousePos.m_bOnBottomRightEdge) { right = gMousePos.x(); bottom = gMousePos.y(); } else if (m_pressedMousePos.m_bOnLeftEdge) { left = gMousePos.x(); } else if (m_pressedMousePos.m_bOnRightEdge) { right = gMousePos.x(); } else if (m_pressedMousePos.m_bOnTopEdge) { top = gMousePos.y(); } else if (m_pressedMousePos.m_bOnBottomEdge) { bottom = gMousePos.y(); } QRect newRect(QPoint(left, top), QPoint(right, bottom)); if (newRect.isValid()) { if (minWidth > newRect.width()) { if (left != origRect.left()) newRect.setLeft(origRect.left()); else newRect.setRight(origRect.right()); } if (minHeight > newRect.height()) { if (top != origRect.top()) newRect.setTop(origRect.top()); else newRect.setBottom(origRect.bottom()); } if (d->m_bRubberBandOnResize) { m_pRubberBand->setGeometry(newRect); } else { m_pWidget->setGeometry(newRect); } } } void WidgetData::moveWidget(const QPoint& gMousePos) { if (d->m_bRubberBandOnMove) { m_pRubberBand->move(gMousePos - m_ptDragPos); } else { m_pWidget->move(gMousePos - m_ptDragPos); } } void WidgetData::handleMousePressEvent(QMouseEvent *event) { if (event->button() == Qt::LeftButton) { m_bLeftButtonPressed = true; m_bLeftButtonTitlePressed = event->pos().y() < m_moveMousePos.m_nTitleHeight; QRect frameRect = m_pWidget->frameGeometry(); m_pressedMousePos.recalculate(event->globalPos(), frameRect); m_ptDragPos = event->globalPos() - frameRect.topLeft(); if (m_pressedMousePos.m_bOnEdges) { if (d->m_bRubberBandOnResize) { m_pRubberBand->setGeometry(frameRect); m_pRubberBand->show(); } } else if (d->m_bRubberBandOnMove && m_bLeftButtonTitlePressed) { m_pRubberBand->setGeometry(frameRect); m_pRubberBand->show(); } } } void WidgetData::handleMouseReleaseEvent(QMouseEvent *event) { if (event->button() == Qt::LeftButton) { m_bLeftButtonPressed = false; m_bLeftButtonTitlePressed = false; m_pressedMousePos.reset(); if (m_pRubberBand && m_pRubberBand->isVisible()) { m_pRubberBand->hide(); m_pWidget->setGeometry(m_pRubberBand->geometry()); } } } void WidgetData::handleMouseMoveEvent(QMouseEvent *event) { if (m_bLeftButtonPressed) { if (d->m_bWidgetResizable && m_pressedMousePos.m_bOnEdges) { resizeWidget(event->globalPos()); } else if (d->m_bWidgetMovable && m_bLeftButtonTitlePressed) { moveWidget(event->globalPos()); } } else if (d->m_bWidgetResizable || d->m_bWidgetMovable) { updateCursorShape(event->globalPos()); } } void WidgetData::handleLeaveEvent(QEvent *event) { Q_UNUSED(event) if (!m_bLeftButtonPressed) { m_pWidget->unsetCursor(); } } void WidgetData::handleHoverMoveEvent(QHoverEvent *event) { if (d->m_bWidgetResizable) { updateCursorShape(m_pWidget->mapToGlobal(event->pos())); } }