外国网站免费空间申请,王也配音演员,wordpress++群晖,房地产推广策略1.概要
创建一个矩形#xff0c;当鼠标进入这个矩形的时候#xff0c;这个矩形边线变色#xff0c;且鼠标变成手型
2.代码
#include QApplication
#include customRectWidget.h
/** qt 6.7版#xff0c; 创建一个矩形#xff0c;当鼠标进入这个矩形…1.概要
创建一个矩形当鼠标进入这个矩形的时候这个矩形边线变色且鼠标变成手型
2.代码
#include QApplication
#include customRectWidget.h
/** qt 6.7版 创建一个矩形当鼠标进入这个矩形的时候这个矩形边线变色* 且鼠标变成手型且这时候按下鼠标鼠标可以上下拖动这个矩形* 当鼠标松开的时候停止移动但鼠标离开矩形的时候矩形颜色恢复完整代码举例* 强调一下鼠标进入矩形内颜色变化鼠标变成手型不是鼠标进入矩形所在的控件就有上述变化。
*/
int main(int argc, char *argv[]) {QApplication app(argc, argv);CustomRectWidget widget;widget.show();return app.exec();
}#ifndef CUSTOMRECTWIDGET_H
#define CUSTOMRECTWIDGET_H#include QWidget
#include QMouseEventclass CustomRectWidget : public QWidget {Q_OBJECTpublic:explicit CustomRectWidget(QWidget *parent nullptr);protected:void paintEvent(QPaintEvent *event) override;void mouseMoveEvent(QMouseEvent *event) override;void mousePressEvent(QMouseEvent *event) override;void mouseReleaseEvent(QMouseEvent *event) override;void enterEvent(QEnterEvent *event) override;void leaveEvent(QEvent *event) override;void setIsChange(const QPoint mousePos);
private:QRect rect;bool dragging;QPoint dragStartPoint;QColor hoverColor;QColor normalColor;bool isChange;bool isMouseInsideRect(const QPoint mousePos) const;
};#endif // CUSTOMRECTWIDGET_H#include customRectWidget.h
#include QPainter
#include QCursor
#include QDebugCustomRectWidget::CustomRectWidget(QWidget *parent): QWidget(parent), rect(50, 50, 200, 100), dragging(false), hoverColor(Qt::red), normalColor(Qt::black) {setFixedSize(300, 300);// 启用鼠标追踪以便在鼠标没有按下时也能接收mouseMoveEventsetMouseTracking(true);
}void CustomRectWidget::setIsChange(const QPoint mousePos){bool value isMouseInsideRect(mousePos);if(valueisChange){return;}update();isChange value;
}void CustomRectWidget::paintEvent(QPaintEvent *event) {Q_UNUSED(event)QPainter painter(this);painter.setRenderHint(QPainter::Antialiasing, true);QColor borderColor normalColor;if (isMouseInsideRect(mapFromGlobal(QCursor::pos()))) {borderColor hoverColor;}painter.setPen(QPen(borderColor, 3));painter.setBrush(Qt::white);painter.drawRect(rect);
}void CustomRectWidget::mousePressEvent(QMouseEvent *event) {setIsChange(event-pos());if (isMouseInsideRect(event-pos())) {dragging true;dragStartPoint event-pos();}
}void CustomRectWidget::mouseMoveEvent(QMouseEvent *event) {setIsChange(event-pos());if (dragging isMouseInsideRect(dragStartPoint)) {int dy event-pos().y() - dragStartPoint.y();rect.moveTop(rect.top() dy);dragStartPoint event-pos();update(); // Trigger repaint with new position}
}void CustomRectWidget::mouseReleaseEvent(QMouseEvent *event) {Q_UNUSED(event)dragging false;
}void CustomRectWidget::enterEvent(QEnterEvent *event) {Q_UNUSED(event)// We manually set the cursor in the mouseMoveEvent based on the rect position
}void CustomRectWidget::leaveEvent(QEvent *event) {Q_UNUSED(event)// Cursor will be reset to default when leaving the widget
}bool CustomRectWidget::isMouseInsideRect(const QPoint mousePos) const {bool ret rect.contains(mousePos);if(ret) {qDebug()in;}else{qDebug()not in;}return ret;
}3.运行结果
