Qt如何实现通用按钮地图效果

这篇文章主要介绍"Qt如何实现通用按钮地图效果"，在日常操作中，相信很多人在Qt如何实现通用按钮地图效果问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答"Qt如何实现通用按钮地图效果"的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

一、前言

主要功能：

1. 可设置防区样式 圆形、警察、气泡、气泡2、消息、消息2

2. 可设置防区状态 布防、撤防、报警、旁路、故障

3. 可设置报警切换

4. 可设置显示的防区号

5. 可设置是否可鼠标拖动

二、代码思路

void ButtonDefence::paintEvent(QPaintEvent *){    double width = this->width();    double height = this->height();    QPainter painter(this);    painter.setRenderHint(QPainter::Antialiasing);    //绘制背景图    QImage img(imgName);    if (!img.isNull()) {        img = img.scaled(width, height, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);        painter.drawImage(0, 0, img);    }    //计算字体    QFont font;    font.setPixelSize(height * 0.37);    font.setBold(true);    //自动计算文字绘制区域,绘制防区号    QRectF rect = this->rect();    if (buttonStyle == ButtonStyle_Police) {        double y = (30 * height / 60);        rect = QRectF(0, y, width, height - y);    } else if (buttonStyle == ButtonStyle_Bubble) {        double y = (8 * height / 60);        rect = QRectF(0, 0, width, height - y);    } else if (buttonStyle == ButtonStyle_Bubble2) {        double y = (13 * height / 60);        rect = QRectF(0, 0, width, height - y);        font.setPixelSize(width * 0.33);    } else if (buttonStyle == ButtonStyle_Msg) {        double y = (17 * height / 60);        rect = QRectF(0, 0, width, height - y);    } else if (buttonStyle == ButtonStyle_Msg2) {        double y = (17 * height / 60);        rect = QRectF(0, 0, width, height - y);    }    //绘制文字标识    painter.setFont(font);    painter.setPen(Qt::white);    painter.drawText(rect, Qt::AlignCenter, text);}bool ButtonDefence::eventFilter(QObject *watched, QEvent *event){    if (canMove) {        static QPoint lastPoint;        static bool isPressed = false;        if (event->type() == QEvent::MouseButtonPress) {            QMouseEvent *e = static_cast(event);            if (this->rect().contains(e->pos()) && (e->button() == Qt::LeftButton)) {                lastPoint = e->pos();                isPressed = true;            }        } else if (event->type() == QEvent::MouseMove && isPressed) {            QMouseEvent *e = static_cast(event);            int dx = e->pos().x() - lastPoint.x();            int dy = e->pos().y() - lastPoint.y();            this->move(this->x() + dx, this->y() + dy);            return true;        } else if (event->type() == QEvent::MouseButtonRelease && isPressed) {            isPressed = false;        }    }    if (event->type() == QEvent::MouseButtonPress) {        emit clicked();    } else if (event->type() == QEvent::MouseButtonDblClick) {        emit doubleClicked();    }    return QWidget::eventFilter(watched, event);}

三、效果图

到此，关于"Qt如何实现通用按钮地图效果"的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注网站，小编会继续努力为大家带来更多实用的文章！