Qt编写自定义控件：带阴影、圆角、可拉伸的弹窗

代码：

#ifndef SHADOW_WIDGET_H
#define SHADOW_WIDGET_H#include <QWidget>class Shadow_Widget : public QWidget
{Q_OBJECTpublic:Shadow_Widget(QWidget *parent = nullptr);~Shadow_Widget();void setCenterWidgetLayout(QLayout * layout);protected:void mouseMoveEvent(QMouseEvent *event)override;void mousePressEvent(QMouseEvent *event)override;void mouseReleaseEvent(QMouseEvent *event)override;private:void setLayout(QLayout * layout);void updatePaddingRect();QWidget * widget;enum class pressType{NoPressed,                 //未按下PressedRight,              //鼠标按下右侧PressedBottom,             //鼠标按下下侧PressedRightBottom,        //鼠标按下右下侧PressedButNotInPadding     //按下但没在右、下、右下边缘};pressType mousePressType{pressType::NoPressed};int padding;                    //边距bool moveEnable = true;         //可移动bool resizeEnable = true;        //可拉伸int rectX, rectY, rectW, rectH; //窗体坐标+宽高QPoint lastPos;QRect rectRight;QRect rectBottom;QRect rectRightBottom;
};
#endif // SHADOW_WIDGET_H

#include "shadow_widget.h"
#include <QVBoxLayout>
#include <QGraphicsDropShadowEffect>
#include <QEvent>
#include <QMouseEvent>Shadow_Widget::Shadow_Widget(QWidget *parent): QWidget(parent)
{padding = 15;moveEnable = true;resizeEnable = true;widget = new QWidget;widget->setObjectName("centerWidget");widget->setStyleSheet("QWidget#centerWidget{background-color:#FFFFFF;border-radius:15px;}");QVBoxLayout *lay_bg = new QVBoxLayout;lay_bg->addWidget(widget);setAttribute(Qt::WA_TranslucentBackground, true);setWindowFlags(this->windowFlags() | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);QGraphicsDropShadowEffect *shadow = new QGraphicsDropShadowEffect(this);shadow->setOffset(0, 0);shadow->setColor(QColor("#444444"));shadow->setBlurRadius(padding);widget->setGraphicsEffect(shadow);lay_bg->setContentsMargins(padding,padding,padding,padding);setLayout(lay_bg);setMouseTracking(true);widget->setMouseTracking(true);
}Shadow_Widget::~Shadow_Widget()
{
}void Shadow_Widget::mouseMoveEvent(QMouseEvent *event)
{QPoint point = event->pos();if (resizeEnable){updatePaddingRect();if (rectRight.contains(point)){setCursor(Qt::SizeHorCursor);}else if (rectBottom.contains(point)){setCursor(Qt::SizeVerCursor);}else if (rectRightBottom.contains(point)){setCursor(Qt::SizeFDiagCursor);}else{setCursor(Qt::ArrowCursor);}}//根据当前鼠标位置,计算XY轴移动了多少int offsetX = point.x() - lastPos.x();int offsetY = point.y() - lastPos.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){if (mousePressType == pressType::PressedButNotInPadding){move(x() + offsetX, y() + offsetY);}}if (resizeEnable){if (mousePressType == pressType::PressedRight){setGeometry(rectX, rectY, rectW + offsetX, rectH);}else if (mousePressType == pressType::PressedBottom){setGeometry(rectX, rectY, rectW, rectH + offsetY);}else if (mousePressType == pressType::PressedRightBottom){int resizeW = rectW + offsetX;int resizeH = rectH + offsetY;setGeometry(x(), y(), resizeW, resizeH);}else{}updatePaddingRect();}QWidget::mouseMoveEvent(event);
}void Shadow_Widget::mousePressEvent(QMouseEvent *event)
{rectX = x();rectY = y();rectW = width();rectH = height();lastPos = event->pos();if (rectRight.contains(lastPos)){mousePressType = pressType::PressedRight;}else if (rectBottom.contains(lastPos)){mousePressType = pressType::PressedBottom;}else if (rectRightBottom.contains(lastPos)){mousePressType = pressType::PressedRightBottom;}else{mousePressType = pressType::PressedButNotInPadding;}QWidget::mousePressEvent(event);
}void Shadow_Widget::mouseReleaseEvent(QMouseEvent *event)
{mousePressType = pressType::NoPressed;setCursor(Qt::ArrowCursor);updatePaddingRect();QWidget::mouseReleaseEvent(event);
}void Shadow_Widget::setLayout(QLayout *layout)
{QWidget::setLayout(layout);
}void Shadow_Widget::setCenterWidgetLayout(QLayout *layout)
{if(widget->layout())return;int left{0},top{0},right{0},bottom{0};layout->getContentsMargins(&left, &top, &right, &bottom);layout->setContentsMargins(std::max(left,padding),std::max(top,padding),std::max(right,padding),std::max(bottom,padding));widget->setLayout(layout);
}void Shadow_Widget::updatePaddingRect()
{int width = this->width();int height = this->height();int padding = 20;rectRight = QRect(width - padding, padding, padding, height - padding * 2);rectBottom = QRect(padding, height - padding, width - padding * 2, padding);rectRightBottom = QRect(width - padding, height - padding, padding, padding);
}

使用：

#include "shadow_widget.h"
#include <QApplication>
#include <QGridLayout>
#include <QPushButton>int main(int argc, char *argv[])
{QApplication a(argc, argv);QGridLayout * gl = new QGridLayout;for(int i = 0;i< 5;++i){for(int j = 0;j < 5;++j){gl->addWidget(new QPushButton("测试"),i,j);}}Shadow_Widget w;w.setCenterWidgetLayout(gl);w.show();w.resize(600,600);return a.exec();
}

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