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MacOSX上的Qt resize无框架小部件

borderless widget resize qt macos

laurapons · 技术社区 · 7 年前

setWindowFlags(Qt::FramelessWindowHint); 我可以从右下角调整窗口大小(QSizeGrip出现,我想它包含在QMainWindow小部件中)。

Windows有一个解决方法,包括覆盖nativeEvent处理程序: Qt/Windows, resizable frameless window ,但我找不到适用于Mac OSX平台的解决方案。

1 回复 | 直到 7 年前

laurapons 7 年前

最好的方法是捕捉鼠标移动事件,显示适合您所在位置的光标,并在按住按钮时调整大小。有一个示例提供了一个框架小部件,您可以将自己的内容放入其中。

    #include <QtWidgets>

    class Frame : public QFrame
    {
    public:

    Frame()
    {
    m_mouse_down = false;
    setFrameShape(Panel);

    // Make this a borderless window which can't
    // be resized or moved via the window system
    setWindowFlags(Qt::FramelessWindowHint);
    setMouseTracking(true);

    m_content = new QWidget(this);

    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(m_content);
    layout->setMargin(5);
    layout->setSpacing(0);
    setLayout(layout);
    }

    // Allows you to access the content area of the frame
    // where widgets and layouts can be added
    QWidget *contentWidget() const { return m_content; }

    void mousePressEvent(QMouseEvent *e)
    {
    m_old_pos = e->pos();
    m_mouse_down = e->button() == Qt::LeftButton;
    }

    void mouseMoveEvent(QMouseEvent *e)
    {
    int x = e->x();
    int y = e->y();

    if (m_mouse_down) {
    int dx = x - m_old_pos.x();
    int dy = y - m_old_pos.y();

    QRect g = geometry();

    if (left)
    g.setLeft(g.left() + dx);
    if (right)
    g.setRight(g.right() + dx);
    if (bottom)
    g.setBottom(g.bottom() + dy);
    if (top)
    g.setTop(g.top() + dy);

    setGeometry(g);

    m_old_pos = QPoint(!left ? e->x() : m_old_pos.x(), e->y());
    } else {
    QRect r = rect();
    top = qAbs(y - r.top()) <= 5;
    left = qAbs(x - r.left()) <= 5;
    right = qAbs(x - r.right()) <= 5;
    bottom = qAbs(y - r.bottom()) <= 5;
    bool hor = left | right;

    if (hor && bottom) {
    if (left)
    setCursor(Qt::SizeBDiagCursor);
    else
    setCursor(Qt::SizeFDiagCursor);
    } else if (hor) {
    setCursor(Qt::SizeHorCursor);
    } else if (bottom || top) {
    setCursor(Qt::SizeVerCursor);
    } else {
    setCursor(Qt::ArrowCursor);
    }
    }
    }

    void mouseReleaseEvent(QMouseEvent *e)
    {
    m_mouse_down = false;
    }

    private:
    QWidget *m_content;
    QPoint m_old_pos;
    bool m_mouse_down;
    bool left, right, bottom, top;
    };


    #include "main.moc"

    int main(int argc, char **argv)
    {
    QApplication app(argc, argv);

    Frame box;

    QVBoxLayout *l = new QVBoxLayout(box.contentWidget());
    l->setMargin(0);
    QTextEdit *edit = new QTextEdit(box.contentWidget());
    l->addWidget(edit);

    box.show();
    return app.exec();
    }