QT 自定义可拖动缩放的无边框窗口，可用于mainmindow, widget

1. 用于拖动，缩放的工具类

“WindowControl.h”

#ifndef WINDOWCONTROL_H
#define WINDOWCONTROL_H#include <QObject>
#include <QRubberBand>
#include <QStyleOptionFocusRect>
#include <QStylePainter>class RubberBand;
class CursorPosCalculator;/*** 窗口控制类* 存储界面对应的数据集合，及是否可移动、可缩放属性* 进行缩放等相关操作*/
class WindowControl : public QObject {Q_OBJECTpublic:explicit WindowControl(QObject *parent = nullptr);~WindowControl();void activeWindow(QWidget *window);         // 激活窗体void removeWindow(QWidget *window);         // 移除窗口void setWindowMove(bool moveAble);          // 窗体移动void setWindowResize(bool resizeAble);      // 窗体缩放void setRubberBandOnMove(bool movable);     // 设置橡皮筋移动void setRubberBandOnResize(bool resizable); // 设置橡皮筋缩放void handleWidgetEvent(QEvent *event); // 处理鼠标划过、按下、按下、释放、移动事件void updateRubberBandStatus();         // 更新橡皮筋状态protected:virtual bool eventFilter(QObject *obj,QEvent *event); // 事件过滤， 移动，缩放private:/** 状态 **/// QHash<QWidget*, WindowData*> windowDataHash;    // 缓存要控制的窗口bool windowMoveAble;           // 可以移动bool windowResizeAble;         // 可以缩放bool windowRubberBandOnResize; // 可以橡皮筋移动bool windowRubberBandOnMove;   // 可以橡皮筋缩放/** 窗口及其操作 **/RubberBand *m_pRubberBand; // 橡皮筋选择框QWidget *m_pWidget;        // 被控制的窗口QPoint m_ptDragPos;        // 拖动时坐标CursorPosCalculator *m_pressedMousePos;CursorPosCalculator *m_moveMousePos;bool m_bLeftButtonPressed;      // 鼠标左键是否按下bool m_bCursorShapeChanged;     // 鼠标形状是否改变bool m_bLeftButtonTitlePressed; // 标题区域是否按下鼠标Qt::WindowFlags m_windowFlags;void updateCursorShape(const QPoint &gMousePos);  // 更新鼠标样式void resizeWidget(const QPoint &gMousePos);       // 重置窗体大小void moveWidget(const QPoint &gMousePos);         // 移动窗体void handleMousePressEvent(QMouseEvent *event);   // 处理鼠标按下void handleMouseReleaseEvent(QMouseEvent *event); // 处理鼠标释放void handleMouseMoveEvent(QMouseEvent *event);    // 处理鼠标移动void handleLeaveEvent(QEvent *event);             // 处理鼠标离开void handleHoverMoveEvent(QHoverEvent *event);    // 处理鼠标进入
};// ================================================================
/*** 窗口控制，*/
class WindowData {};// ==================================================================
/*** 自定义的橡皮筋选择框* @brief The RubberBand class*/
class RubberBand : public QRubberBand {public:RubberBand(Shape s, QWidget *p = nullptr) : QRubberBand(s, p) {QPalette palette;palette.setBrush(QPalette::WindowText, QBrush(Qt::lightGray));setPalette(palette); // 调色板应用到当前的橡皮筋对象上repaint();}protected:virtual void paintEvent(QPaintEvent *) {QStylePainter painter(this);QStyleOptionFocusRect option;option.initFrom(this);QPen pen;pen.setStyle(Qt::DashLine);pen.setWidth(1);pen.setColor(QColor(Qt::red));painter.setPen(pen);painter.drawControl(QStyle::CE_FocusFrame, option);}
};// ==================================================================
/*** 计算鼠标是否位于左、上、右、下、左上角、左下角、右上角、右下角*/class CursorPosCalculator {public:explicit CursorPosCalculator();void reset();void recalculate(const QPoint &globalMousePos, const QRect &frameRect);public:bool m_bOnEdges;bool m_bOnLeftEdge;bool m_bOnRightEdge;bool m_bOnTopEdge;bool m_bOnBottomEdge;bool m_bOnTopLeftEdge;bool m_bOnBottomLeftEdge;bool m_bOnTopRightEdge;bool m_bOnBottomRightEdge;static int m_nBorderWidth;static int m_nTitleHeight;
};#endif // WINDOWCONTROL_H

WindowControl.cpp

#include "utils/WindowControl.h"
#include "qcoreevent.h"#include <QMouseEvent>/*** @brief WindowControl::WindowControl*/
WindowControl::WindowControl(QObject *parent) : QObject(parent) {// 初始化状态windowMoveAble = true;windowResizeAble = true;windowRubberBandOnMove = false;windowRubberBandOnResize = false;m_pressedMousePos = new CursorPosCalculator;m_moveMousePos = new CursorPosCalculator;
}WindowControl::~WindowControl() {m_pWidget->setMouseTracking(false);           // 禁用鼠标跟踪m_pWidget->setWindowFlags(m_windowFlags);     // 还原窗口标志m_pWidget->setAttribute(Qt::WA_Hover, false); // 禁用鼠标指针悬停事件delete m_pRubberBand;m_pRubberBand = NULL;delete m_pressedMousePos;m_pressedMousePos = NULL;delete m_moveMousePos;m_moveMousePos = NULL;
}bool WindowControl::eventFilter(QObject *obj, QEvent *event) {switch (event->type()) {case QEvent::MouseMove:case QEvent::HoverMove:case QEvent::MouseButtonPress:case QEvent::MouseButtonRelease:case QEvent::Leave: {if (obj == m_pWidget) {handleWidgetEvent(event);return true;}}default:return QObject::eventFilter(obj, event);}
}void WindowControl::activeWindow(QWidget *window) {m_pWidget = window;window->installEventFilter(this); // 安装事件过滤器m_bLeftButtonPressed = false;m_bCursorShapeChanged = false;m_bLeftButtonTitlePressed = false;m_pRubberBand = NULL;m_windowFlags = m_pWidget->windowFlags();m_pWidget->setMouseTracking(true);           // 鼠标追踪m_pWidget->setAttribute(Qt::WA_Hover, true); // 启用鼠标指针悬停事件updateRubberBandStatus();
}void WindowControl::removeWindow(QWidget *window) {if (m_pWidget) {delete this;}
}void WindowControl::setWindowMove(bool moveAble) { windowMoveAble = moveAble; }void WindowControl::setWindowResize(bool resizeAble) { windowResizeAble = resizeAble; }void WindowControl::setRubberBandOnMove(bool movable) {windowRubberBandOnMove = movable;updateRubberBandStatus();
}void WindowControl::setRubberBandOnResize(bool resizable) {windowRubberBandOnResize = resizable;updateRubberBandStatus();
}void WindowControl::updateRubberBandStatus() {if (windowRubberBandOnResize || windowRubberBandOnMove) {if (NULL == m_pRubberBand) {m_pRubberBand = new RubberBand(QRubberBand::Rectangle);}} else {delete m_pRubberBand;m_pRubberBand = NULL;}
}void WindowControl::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(event);break;case QEvent::HoverMove:handleHoverMoveEvent(static_cast<QHoverEvent *>(event));break;}
}void WindowControl::updateCursorShape(const QPoint &gMousePos) {// 检查全屏或最大化状态if (m_pWidget->isFullScreen() || m_pWidget->isMaximized()) {if (m_bCursorShapeChanged) {m_pWidget->unsetCursor(); // 光标设置为默认}return;}m_moveMousePos->recalculate(gMousePos, m_pWidget->frameGeometry());if (m_moveMousePos->m_bOnTopLeftEdge || m_moveMousePos->m_bOnBottomRightEdge) {m_pWidget->setCursor(Qt::SizeFDiagCursor); // 对角线大小调整光标m_bCursorShapeChanged = true;} else if (m_moveMousePos->m_bOnTopRightEdge || m_moveMousePos->m_bOnBottomLeftEdge) {m_pWidget->setCursor(Qt::SizeBDiagCursor); // 反对角线大小调整光标m_bCursorShapeChanged = true;} else if (m_moveMousePos->m_bOnLeftEdge || m_moveMousePos->m_bOnRightEdge) {m_pWidget->setCursor(Qt::SizeHorCursor); // 水平调整大小光标m_bCursorShapeChanged = true;} else if (m_moveMousePos->m_bOnTopEdge || m_moveMousePos->m_bOnBottomEdge) {m_pWidget->setCursor(Qt::SizeVerCursor); // 垂直调整大小光标m_bCursorShapeChanged = true;} else {if (m_bCursorShapeChanged) {m_pWidget->unsetCursor(); // 恢复默认m_bCursorShapeChanged = false;}}
}void WindowControl::resizeWidget(const QPoint &gMousePos) {QRect origRect;if (windowRubberBandOnResize)origRect = m_pRubberBand->frameGeometry();elseorigRect = 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();int minWidth = 40;int minHeight = 40;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());elsenewRect.setRight(origRect.right());}if (minHeight > newRect.height()) {if (top != origRect.top())newRect.setTop(origRect.top());elsenewRect.setBottom(origRect.bottom());}if (windowRubberBandOnResize) {m_pRubberBand->setGeometry(newRect);} else {m_pWidget->setGeometry(newRect);}}
}void WindowControl::moveWidget(const QPoint &gMousePos) {if (windowRubberBandOnMove) {m_pRubberBand->move(gMousePos - m_ptDragPos);} else {m_pWidget->move(gMousePos - m_ptDragPos);}
}void WindowControl::handleMousePressEvent(QMouseEvent *event) {if (event->button() == Qt::LeftButton) {m_bLeftButtonPressed = true;m_bLeftButtonTitlePressed = event->pos().y() < 30;QRect frameRect = m_pWidget->frameGeometry();QRect moveRect(frameRect.x(), frameRect.y(), frameRect.width(), 30);m_pressedMousePos->recalculate(event->globalPos(), frameRect);m_ptDragPos = event->globalPos() - frameRect.topLeft();if (m_pressedMousePos->m_bOnEdges) {if (windowRubberBandOnResize) {m_pRubberBand->setGeometry(frameRect);m_pRubberBand->show();}} else if (windowRubberBandOnMove) {if (moveRect.contains(event->globalPos())) {m_pRubberBand->setGeometry(frameRect);m_pRubberBand->show();}}}
}void WindowControl::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 WindowControl::handleMouseMoveEvent(QMouseEvent *event) {if (m_bLeftButtonPressed) {if (windowResizeAble && m_pressedMousePos->m_bOnEdges) {resizeWidget(event->globalPos());} else if (windowMoveAble && m_bLeftButtonTitlePressed) {moveWidget(event->globalPos());}} else if (windowResizeAble) {updateCursorShape(event->globalPos());}
}void WindowControl::handleLeaveEvent(QEvent *event) {Q_UNUSED(event)if (!m_bLeftButtonPressed) {m_pWidget->unsetCursor();}
}void WindowControl::handleHoverMoveEvent(QHoverEvent *event) {if (windowResizeAble) {updateCursorShape(m_pWidget->mapToGlobal(event->pos())); // 局部坐标转全局屏幕坐标}
}// CursorPosCalculator==========================================int CursorPosCalculator::m_nBorderWidth = 5;
int CursorPosCalculator::m_nTitleHeight = 30;CursorPosCalculator::CursorPosCalculator() { reset(); }void CursorPosCalculator::reset() {m_bOnEdges = false;m_bOnLeftEdge = false;m_bOnRightEdge = false;m_bOnTopEdge = false;m_bOnBottomEdge = false;m_bOnTopLeftEdge = false;m_bOnBottomLeftEdge = false;m_bOnTopRightEdge = false;m_bOnBottomRightEdge = false;
}void CursorPosCalculator::recalculate(const QPoint &gMousePos, const QRect &frameRect) {int globalMouseX = gMousePos.x();int globalMouseY = gMousePos.y();int frameX = frameRect.x();int frameY = frameRect.y();int frameWidth = frameRect.width();int frameHeight = frameRect.height();m_bOnLeftEdge = (globalMouseX >= frameX && globalMouseX <= frameX + m_nBorderWidth);m_bOnRightEdge = (globalMouseX >= frameX + frameWidth - m_nBorderWidth && globalMouseX <= frameX + frameWidth);m_bOnTopEdge = (globalMouseY >= frameY && globalMouseY <= frameY + m_nBorderWidth);m_bOnBottomEdge = (globalMouseY >= frameY + frameHeight - m_nBorderWidth && globalMouseY <= frameY + frameHeight);m_bOnTopLeftEdge = m_bOnTopEdge && m_bOnLeftEdge;m_bOnBottomLeftEdge = m_bOnBottomEdge && m_bOnLeftEdge;m_bOnTopRightEdge = m_bOnTopEdge && m_bOnRightEdge;m_bOnBottomRightEdge = m_bOnBottomEdge && m_bOnRightEdge;m_bOnEdges = m_bOnLeftEdge || m_bOnRightEdge || m_bOnTopEdge || m_bOnBottomEdge;
}

2. 使用示例

定义基类：

#ifndef WINDOW_H
#define WINDOW_H#include <QMainWindow>/*** 自定义无边框mainwindow*/
class Window : public QMainWindow {Q_OBJECTpublic:Window(QWidget *parent = nullptr);~Window();private:void framelesshelperInit();
};#endif // WINDOW_H

#include "component/window.h"
#include "utils/WindowControl.h"Window::Window(QWidget *parent) : QMainWindow(parent) {resize(1200, 740);setWindowFlags(Qt::FramelessWindowHint);framelesshelperInit();
}Window::~Window() {}void Window::framelesshelperInit() {// this指的是要处理的窗体WindowControl *control = new WindowControl(this);control->activeWindow(this);          //激活当前窗体control->setWindowMove(true);         //设置窗体可移动control->setWindowResize(true);       //设置窗体可缩放control->setRubberBandOnMove(true);   //设置橡皮筋效果-可移动control->setRubberBandOnResize(true); //设置橡皮筋效果-可缩放
}

继承可拖动缩放的窗口：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include "component/window.h"#include <QMainWindow>class MainWindow : public Window {Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();
};
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include <QLabel>MainWindow::MainWindow(QWidget *parent) : Window(parent) {resize(1200, 740);setWindowFlags(Qt::FramelessWindowHint);// 创建自定义标题栏QLabel *customTitleBar = new QLabel("自定义标题栏", this);customTitleBar->setStyleSheet("background-color: blue; color: white;");// 设置自定义标题栏setMenuWidget(customTitleBar);}MainWindow::~MainWindow() {}

使用：

#include "mainwindow.h"#include "component/window.h"#include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);MainWindow w;w.show();return a.exec();
}

控制类引用自： https://blog.csdn.net/u012959478/article/details/140658545

上述测试工程代码： https://download.csdn.net/download/qq_51355375/89783077