qt_demoe/widget/framelesswidget/framelesswidget2.cpp

#include "framelesswidget2.h"
#include "qevent.h"
#include "qdebug.h"

FramelessWidget2::FramelessWidget2(QObject *parent) : QObject(parent)
{
    padding = 8;
    moveEnable = true;
    resizeEnable = true;
    widget = 0;

    mousePressed = false;
    mousePoint = QPoint(0, 0);
    mouseRect = QRect(0, 0, 0, 0);

    for (int i = 0; i < 8; ++i) {
        pressedArea << false;
        pressedRect << QRect(0, 0, 0, 0);
    }

    //如果父类是窗体则直接设置
    if (parent->isWidgetType()) {
        setWidget((QWidget *)parent);
    }
}

bool FramelessWidget2::eventFilter(QObject *watched, QEvent *event)
{
    if (widget && watched == widget) {
        int type = event->type();
        if (type == QEvent::WindowStateChange) {
            //解决mac系统上无边框最小化失效的bug
#ifdef Q_OS_MACOS
            if (widget->windowState() & Qt::WindowMinimized) {
                isMin = true;
            } else {
                if (isMin) {
                    //设置无边框属性
                    widget->setWindowFlags(flags | Qt::FramelessWindowHint);
                    widget->setVisible(true);
                    isMin = false;
                }
            }
#endif
        } else if (type == QEvent::Resize) {
            //重新计算八个描点的区域,描点区域的作用还有就是计算鼠标坐标是否在某一个区域内
            int width = widget->width();
            int height = widget->height();

            //左侧描点区域
            pressedRect[0] = QRect(0, padding, padding, height - padding * 2);
            //右侧描点区域
            pressedRect[1] = QRect(width - padding, padding, padding, height - padding * 2);
            //上侧描点区域
            pressedRect[2] = QRect(padding, 0, width - padding * 2, padding);
            //下侧描点区域
            pressedRect[3] = QRect(padding, height - padding, width - padding * 2, padding);

            //左上角描点区域
            pressedRect[4] = QRect(0, 0, padding, padding);
            //右上角描点区域
            pressedRect[5] = QRect(width - padding, 0, padding, padding);
            //左下角描点区域
            pressedRect[6] = QRect(0, height - padding, padding, padding);
            //右下角描点区域
            pressedRect[7] = QRect(width - padding, height - padding, padding, padding);
        } else if (type == QEvent::HoverMove) {
            //设置对应鼠标形状,这个必须放在这里而不是下面,因为可以在鼠标没有按下的时候识别
            QHoverEvent *hoverEvent = (QHoverEvent *)event;
            QPoint point = hoverEvent->pos();
            if (resizeEnable) {
                if (pressedRect.at(0).contains(point)) {
                    widget->setCursor(Qt::SizeHorCursor);
                } else if (pressedRect.at(1).contains(point)) {
                    widget->setCursor(Qt::SizeHorCursor);
                } else if (pressedRect.at(2).contains(point)) {
                    widget->setCursor(Qt::SizeVerCursor);
                } else if (pressedRect.at(3).contains(point)) {
                    widget->setCursor(Qt::SizeVerCursor);
                } else if (pressedRect.at(4).contains(point)) {
                    widget->setCursor(Qt::SizeFDiagCursor);
                } else if (pressedRect.at(5).contains(point)) {
                    widget->setCursor(Qt::SizeBDiagCursor);
                } else if (pressedRect.at(6).contains(point)) {
                    widget->setCursor(Qt::SizeBDiagCursor);
                } else if (pressedRect.at(7).contains(point)) {
                    widget->setCursor(Qt::SizeFDiagCursor);
                } else {
                    widget->setCursor(Qt::ArrowCursor);
                }
            }

            //根据当前鼠标位置,计算XY轴移动了多少
            int offsetX = point.x() - mousePoint.x();
            int offsetY = point.y() - mousePoint.y();

            //根据按下处的位置判断是否是移动控件还是拉伸控件
            if (moveEnable && mousePressed) {
                widget->move(widget->x() + offsetX, widget->y() + offsetY);
            }

            if (resizeEnable) {
                int rectX = mouseRect.x();
                int rectY = mouseRect.y();
                int rectW = mouseRect.width();
                int rectH = mouseRect.height();

                if (pressedArea.at(0)) {
                    int resizeW = widget->width() - offsetX;
                    if (widget->minimumWidth() <= resizeW) {
                        widget->setGeometry(widget->x() + offsetX, rectY, resizeW, rectH);
                    }
                } else if (pressedArea.at(1)) {
                    widget->setGeometry(rectX, rectY, rectW + offsetX, rectH);
                } else if (pressedArea.at(2)) {
                    int resizeH = widget->height() - offsetY;
                    if (widget->minimumHeight() <= resizeH) {
                        widget->setGeometry(rectX, widget->y() + offsetY, rectW, resizeH);
                    }
                } else if (pressedArea.at(3)) {
                    widget->setGeometry(rectX, rectY, rectW, rectH + offsetY);
                } else if (pressedArea.at(4)) {
                    int resizeW = widget->width() - offsetX;
                    int resizeH = widget->height() - offsetY;
                    if (widget->minimumWidth() <= resizeW) {
                        widget->setGeometry(widget->x() + offsetX, widget->y(), resizeW, resizeH);
                    }
                    if (widget->minimumHeight() <= resizeH) {
                        widget->setGeometry(widget->x(), widget->y() + offsetY, resizeW, resizeH);
                    }
                } else if (pressedArea.at(5)) {
                    int resizeW = rectW + offsetX;
                    int resizeH = widget->height() - offsetY;
                    if (widget->minimumHeight() <= resizeH) {
                        widget->setGeometry(widget->x(), widget->y() + offsetY, resizeW, resizeH);
                    }
                } else if (pressedArea.at(6)) {
                    int resizeW = widget->width() - offsetX;
                    int resizeH = rectH + offsetY;
                    if (widget->minimumWidth() <= resizeW) {
                        widget->setGeometry(widget->x() + offsetX, widget->y(), resizeW, resizeH);
                    }
                    if (widget->minimumHeight() <= resizeH) {
                        widget->setGeometry(widget->x(), widget->y(), resizeW, resizeH);
                    }
                } else if (pressedArea.at(7)) {
                    int resizeW = rectW + offsetX;
                    int resizeH = rectH + offsetY;
                    widget->setGeometry(widget->x(), widget->y(), resizeW, resizeH);
                }
            }
        } else if (type == QEvent::MouseButtonPress) {
            //必须是鼠标左键
            if (qApp->mouseButtons() == Qt::LeftButton) {
                //记住鼠标按下的坐标和窗体区域
                QMouseEvent *mouseEvent = (QMouseEvent *)event;
                mousePoint = mouseEvent->pos();
                mouseRect = widget->geometry();

                //判断按下的手柄的区域位置
                if (pressedRect.at(0).contains(mousePoint)) {
                    pressedArea[0] = true;
                } else if (pressedRect.at(1).contains(mousePoint)) {
                    pressedArea[1] = true;
                } else if (pressedRect.at(2).contains(mousePoint)) {
                    pressedArea[2] = true;
                } else if (pressedRect.at(3).contains(mousePoint)) {
                    pressedArea[3] = true;
                } else if (pressedRect.at(4).contains(mousePoint)) {
                    pressedArea[4] = true;
                } else if (pressedRect.at(5).contains(mousePoint)) {
                    pressedArea[5] = true;
                } else if (pressedRect.at(6).contains(mousePoint)) {
                    pressedArea[6] = true;
                } else if (pressedRect.at(7).contains(mousePoint)) {
                    pressedArea[7] = true;
                } else {
                    mousePressed = true;
                }
            }
        } else if (type == QEvent::MouseMove) {
            //改成用HoverMove识别
        } else if (type == QEvent::MouseButtonRelease) {
            //恢复所有
            widget->setCursor(Qt::ArrowCursor);
            mousePressed = false;
            for (int i = 0; i < 8; ++i) {
                pressedArea[i] = false;
            }
        }
    }

    return QObject::eventFilter(watched, event);
}

void FramelessWidget2::setPadding(int padding)
{
    this->padding = padding;
}

void FramelessWidget2::setMoveEnable(bool moveEnable)
{
    this->moveEnable = moveEnable;
}

void FramelessWidget2::setResizeEnable(bool resizeEnable)
{
    this->resizeEnable = resizeEnable;
}

void FramelessWidget2::setMousePressed(bool mousePressed)
{
    this->mousePressed = mousePressed;
}

void FramelessWidget2::setWidget(QWidget *widget)
{
    if (this->widget == 0) {
        this->widget = widget;
        //设置鼠标追踪为真
        this->widget->setMouseTracking(true);
        //绑定事件过滤器
        this->widget->installEventFilter(this);
        //设置悬停为真,必须设置这个,不然当父窗体里边还有子窗体全部遮挡了识别不到MouseMove,需要识别HoverMove
        this->widget->setAttribute(Qt::WA_Hover, true);

        isMin = false;
        flags = widget->windowFlags();
    }
}