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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！
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主要功能：
可设置防区样式 圆形、警察、气泡、气泡2、消息、消息2
可设置防区状态 布防、撤防、报警、旁路、故障
可设置报警切换
可设置显示的防区号
可设置是否可鼠标拖动
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);
} 
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，请继续关注创新互联网站，小编会继续努力为大家带来更多实用的文章！