Qt实现无边框可以拖拽拉伸

#ifndef FRAMELESS_WINDOW_HPP_
#define FRAMELESS_WINDOW_HPP_
#pragma once#include <QString>
#include <QFile>
#include <QWidget>
#include <QScreen>
#include <QMouseEvent>
#include <QApplication>template <typename T>
class FramelessWindow : public T {public:enum class Direction {UP = 0,DOWN = 1,LEFT,RIGHT,LEFTTOP,LEFTBOTTOM,RIGHTBOTTOM,RIGHTTOP,NONE};FramelessWindow::FramelessWindow(bool translucentBackground, QWidget* parent = Q_NULLPTR): T(parent), m_bLeftPressed(false), m_bResizeable(false), m_bMaximize(false), m_Direction(Direction::NONE), m_iResizeRegionPadding(4) {installEventFilter(this);Qt::WindowFlags flags = windowFlags();setWindowFlags( flags | Qt::FramelessWindowHint);if (translucentBackground) {setAttribute(Qt::WA_TranslucentBackground);}}FramelessWindow::~FramelessWindow() {}void setTitlebar(QVector<QWidget*> titleBar) { m_titlebarWidget = titleBar; }void setResizeable(bool b) { m_bResizeable = b; }bool resizeable() const { return m_bResizeable; }void setAllWidgetMouseTracking(QWidget* widget) {if (!widget)return;widget->setMouseTracking(true);QObjectList list = widget->children();foreach (QObject* obj, list) {if (obj->metaObject()->className() == QStringLiteral("QWidget")) {QWidget* w = (QWidget*)obj;w->setMouseTracking(true);setAllWidgetMouseTracking(w);}}}protected:bool eventFilter(QObject* target, QEvent* event) {if (event->type() == QEvent::Paint) {static bool first = false;if (!false) {first = true;setAllWidgetMouseTracking(this);}}else if (event->type() == QEvent::WindowStateChange) {m_bMaximize = this->windowState() & Qt::WindowMaximized;}return T::eventFilter(target, event);}void mouseDoubleClickEvent(QMouseEvent *event) {if (m_bResizeable) {QWidget* actionWidget = QApplication::widgetAt(event->globalPos());if (actionWidget) {bool inTitlebar = false;for (auto& item : m_titlebarWidget) {if (actionWidget == item) {inTitlebar = true;break;}}if (inTitlebar) {if (m_bMaximize) {this->showNormal();}else {this->showMaximized();}}}}T::mouseDoubleClickEvent(event);}void mousePressEvent(QMouseEvent* event) {if (event->button() == Qt::LeftButton) {if (m_Direction != Direction::NONE) {m_bLeftPressed = true;this->mouseGrabber();}else {QWidget* action = QApplication::widgetAt(event->globalPos());if (action) {bool inTitlebar = false;for (auto& item : m_titlebarWidget) {if (action == item) {inTitlebar = true;break;}}if (inTitlebar) {m_bLeftPressed = true;m_DragPos = event->globalPos() - this->frameGeometry().topLeft();}}}}return T::mousePressEvent(event);}void mouseMoveEvent(QMouseEvent* event) {QPoint globalPoint = event->globalPos();if (m_bLeftPressed) {bool bIgnore = true;QList<QScreen*> screens = QGuiApplication::screens();for (int i = 0; i < screens.size(); i++) {QScreen* pScreen = screens[i];QRect geometryRect = pScreen->availableGeometry();if (geometryRect.contains(globalPoint)) {bIgnore = false;break;}}if (bIgnore) {event->ignore();return;}if (m_Direction != Direction::NONE) {QRect rect = this->rect();QPoint tl = mapToGlobal(rect.topLeft());QPoint rb = mapToGlobal(rect.bottomRight());QRect rMove(tl, rb);switch (m_Direction) {case Direction::LEFT:if (rb.x() - globalPoint.x() <= this->minimumWidth())rMove.setX(tl.x());elserMove.setX(globalPoint.x());break;case Direction::RIGHT:rMove.setWidth(globalPoint.x() - tl.x());break;case Direction::UP:if (rb.y() - globalPoint.y() <= this->minimumHeight())rMove.setY(tl.y());elserMove.setY(globalPoint.y());break;case Direction::DOWN:rMove.setHeight(globalPoint.y() - tl.y());break;case Direction::LEFTTOP:if (rb.x() - globalPoint.x() <= this->minimumWidth())rMove.setX(tl.x());elserMove.setX(globalPoint.x());if (rb.y() - globalPoint.y() <= this->minimumHeight())rMove.setY(tl.y());elserMove.setY(globalPoint.y());break;case Direction::RIGHTTOP:rMove.setWidth(globalPoint.x() - tl.x());rMove.setY(globalPoint.y());break;case Direction::LEFTBOTTOM:rMove.setX(globalPoint.x());rMove.setHeight(globalPoint.y() - tl.y());break;case Direction::RIGHTBOTTOM:rMove.setWidth(globalPoint.x() - tl.x());rMove.setHeight(globalPoint.y() - tl.y());break;default:break;}this->setGeometry(rMove);}else {this->move(event->globalPos() - m_DragPos);event->accept();}}else {region(globalPoint);}return T::mouseMoveEvent(event);}void region(const QPoint& cursorGlobalPoint) {if (!m_bResizeable)return;QRect rect = this->contentsRect();QPoint tl = mapToGlobal(rect.topLeft());QPoint rb = mapToGlobal(rect.bottomRight());int x = cursorGlobalPoint.x();int y = cursorGlobalPoint.y();if (tl.x() + m_iResizeRegionPadding >= x && tl.x() <= x &&tl.y() + m_iResizeRegionPadding >= y && tl.y() <= y) {m_Direction = Direction::LEFTTOP;this->setCursor(QCursor(Qt::SizeFDiagCursor));}else if (x >= rb.x() - m_iResizeRegionPadding && x <= rb.x() &&y >= rb.y() - m_iResizeRegionPadding && y <= rb.y()) {m_Direction = Direction::RIGHTBOTTOM;this->setCursor(QCursor(Qt::SizeFDiagCursor));}else if (x <= tl.x() + m_iResizeRegionPadding && x >= tl.x() &&y >= rb.y() - m_iResizeRegionPadding && y <= rb.y()) {m_Direction = Direction::LEFTBOTTOM;this->setCursor(QCursor(Qt::SizeBDiagCursor));}else if (x <= rb.x() && x >= rb.x() - m_iResizeRegionPadding && y >= tl.y() &&y <= tl.y() + m_iResizeRegionPadding) {m_Direction = Direction::RIGHTTOP;this->setCursor(QCursor(Qt::SizeBDiagCursor));}else if (x <= tl.x() + m_iResizeRegionPadding && x >= tl.x()) {m_Direction = Direction::LEFT;this->setCursor(QCursor(Qt::SizeHorCursor));}else if (x <= rb.x() && x >= rb.x() - m_iResizeRegionPadding) {m_Direction = Direction::RIGHT;this->setCursor(QCursor(Qt::SizeHorCursor));}else if (y >= tl.y() && y <= tl.y() + m_iResizeRegionPadding) {m_Direction = Direction::UP;this->setCursor(QCursor(Qt::SizeVerCursor));}else if (y <= rb.y() && y >= rb.y() - m_iResizeRegionPadding) {m_Direction = Direction::DOWN;this->setCursor(QCursor(Qt::SizeVerCursor));}else {m_Direction = Direction::NONE;this->setCursor(QCursor(Qt::ArrowCursor));}}void mouseReleaseEvent(QMouseEvent* event) {m_bLeftPressed = false;if (m_Direction != Direction::NONE) {m_Direction = Direction::NONE;this->releaseMouse();this->setCursor(QCursor(Qt::ArrowCursor));}return QWidget::mouseReleaseEvent(event);}void resizeEvent(QResizeEvent* event) { return QWidget::resizeEvent(event); }protected:bool m_bLeftPressed;bool m_bResizeable;bool m_bMaximize;Direction m_Direction;const int m_iResizeRegionPadding;QPoint m_DragPos;QVector<QWidget*> m_titlebarWidget;
};static void loadStyleSheetFile(const QString& sheetName, QWidget* widget) {if (widget) {QString qss;QFile qssFile(sheetName);qssFile.open(QFile::ReadOnly);if (qssFile.isOpen()) {qss = QLatin1String(qssFile.readAll());widget->setStyleSheet(qss);qssFile.close();}}
}#endif

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Qt实现无边框可以拖拽拉伸

Qt实现无边框可以拖拽拉伸

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