Qt编写可拖动对象+背景地图+多种样式+多种状态

#include "buttondefence.h" #include "head.h" ButtonDefence::ButtonDefence(QWidget *parent) : QWidget(parent) { canMove = false; text = "1"; buttonStyle = ButtonStyle_Police; buttonStatus = ButtonStatus_Arming; type = "police"; imgName = QString(":/image/btn_defence_disarming_%1.png").arg(type); isDark = false; timer = new QTimer(this); timer->setInterval(500); connect(timer, SIGNAL(timeout()), this, SLOT(checkAlarm())); this->installEventFilter(this); } void ButtonDefence::paintEvent(QPaintEvent *) { int width = this->width(); int 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::KeepAspectRatio, Qt::SmoothTransformation); painter.drawImage(0, 0, img); } //计算字体 QFont font; font.setPixelSize(width * 0.37); font.setBold(true); //自动计算文字绘制区域,绘制防区号 QRect rect = this->rect(); if (buttonStyle == ButtonStyle_Police) { int y = (30 * height / 60); rect = QRect(0, y, width, height - y); } else if (buttonStyle == ButtonStyle_Bubble) { int y = (10 * height / 60); rect = QRect(0, 0, width, height - y); } else if (buttonStyle == ButtonStyle_Bubble2) { int y = (15 * height / 60); rect = QRect(0, 0, width, height - y); font.setPixelSize(width * 0.33); } else if (buttonStyle == ButtonStyle_Msg) { int y = (17 * height / 60); rect = QRect(0, 0, width, height - y); } else if (buttonStyle == ButtonStyle_Msg2) { int y = (17 * height / 60); rect = QRect(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<QMouseEvent *>(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<QMouseEvent *>(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; } } return QWidget::eventFilter(watched, event); } void ButtonDefence::checkAlarm() { if (isDark) { imgName = QString(":/image/btn_defence_error_%1.png").arg(type); } else { imgName = QString(":/image/btn_defence_alarm_%1.png").arg(type); } isDark = !isDark; update(); } void ButtonDefence::setCanMove(bool canMove) { this->canMove = canMove; } void ButtonDefence::setText(const QString &text) { if (this->text != text) { this->text = text; update(); } } void ButtonDefence::setButtonStyle(const ButtonDefence::ButtonStyle &buttonStyle) { this->buttonStyle = buttonStyle; if (buttonStyle == ButtonStyle_Circle) { type = "circle"; } else if (buttonStyle == ButtonStyle_Police) { type = "police"; } else if (buttonStyle == ButtonStyle_Bubble) { type = "bubble"; } else if (buttonStyle == ButtonStyle_Bubble2) { type = "bubble2"; } else if (buttonStyle == ButtonStyle_Msg) { type = "msg"; } else if (buttonStyle == ButtonStyle_Msg2) { type = "msg2"; } else { type = "circle"; } setButtonStatus(buttonStatus); } void ButtonDefence::setButtonStatus(const ButtonDefence::ButtonStatus &buttonStatus) { this->buttonStatus = buttonStatus; isDark = false; if (timer->isActive()) { timer->stop(); } if (buttonStatus == ButtonStatus_Arming) { imgName = QString(":/image/btn_defence_arming_%1.png").arg(type); } else if (buttonStatus == ButtonStatus_Disarming) { imgName = QString(":/image/btn_defence_disarming_%1.png").arg(type); } else if (buttonStatus == ButtonStatus_Bypass) { imgName = QString(":/image/btn_defence_bypass_%1.png").arg(type); } else if (buttonStatus == ButtonStatus_Error) { imgName = QString(":/image/btn_defence_error_%1.png").arg(type); } else if (buttonStatus == ButtonStatus_Alarm) { checkAlarm(); if (!timer->isActive()) { timer->start(); } } update(); }