Qt 窗口相关的常用操作

PS: 本文使用的是Qt 4.8.4版本，不同版本代码可能会有差异

设置窗口标题

setWindowTitle(QString::fromLocal8Bit("易语言"));

禁用窗口最大化按钮

setWindowFlags(Qt::Dialog | Qt::WindowMinimizeButtonHint);

禁止窗口改变大小

setFixedSize(this->width(), this->height());

鼠标左键按下

// 重写虚函数
void mousePressEvent(QMouseEvent* event);
void QLoginSuccess::mousePressEvent(QMouseEvent* event)
{
    m_start = event->pos();
    // 获取当前lable空间的坐标
    QPoint lablePos = ui.label->pos();
    if ((m_start.x() > lablePos.x()) && (m_start.x() < (lablePos.x() +)) && (m_start.y() > lablePos.y()) && (m_start.y() < (lablePos.y() +)))
    {
        qDebug() << GBK::ToUnicode("在控件上！") << endl;
        isNeedDrag = true;
    }
}

鼠标移动

void mouseMoveEvent(QMouseEvent* event);
void QLoginSuccess::mouseMoveEvent(QMouseEvent* event)
{
    if (isNeedDrag == true)
    {
        m_end = event->pos();
        m_PosVector.push_back(m_end);
        if (m_PosVector.size() >= )
        {
            QPoint pp = m_PosVector.at(m_PosVector.size() - ) - m_PosVector.at(m_PosVector.size() - ) + ui.label->pos();
            ui.label->move(pp.x(), pp.y());
        }
    }

}

鼠标释放

void mouseReleaseEvent(QMouseEvent* event);
void QLoginSuccess::mouseReleaseEvent(QMouseEvent* event)
{
    // 标志位置为false
    isNeedDrag = false;
}

获取键盘按键

void keyPressEvent(QKeyEvent * event);
void PlaneGame::keyPressEvent(QKeyEvent * event)
{
    if (event->key() == Qt::Key_Left)
    {
        if (ui.meLabel->pos().x() >= )
        {
            ui.meLabel->move(ui.meLabel->pos().x() - , ui.meLabel->pos().y());
        }
    }
    else if (event->key() == Qt::Key_Right)
    {
        if (ui.meLabel->pos().x() <= )
        {
            ui.meLabel->move(ui.meLabel->pos().x() + , ui.meLabel->pos().y());
        }
    }
    else if (event->key() == Qt::Key_F1)
    {
        CBullet* bullet = new CBullet(this);
        bullet->move(ui.meLabel->pos().x() + , ui.meLabel->pos().y() + );
        bullets.push_back(bullet);
        bullet->show();
    }
}

关闭对话框事件处理函数

void closeEvent(QCloseEvent* event);

 Qt 生成随机数

// 生成随机数种子(一般在构造函数执行一次就行)
qsrand(QTime(, , ).secsTo(QTime::currentTime()));
// 随机产生一个0到7之间的数
int n = qrand() % ;