c++ - 在 QT 中从一个 QToolButton 切换到另一个

Question

我想从一个 QToolButton 切换到 QToolBar 中的另一个。我使用过 QStackedWidget，从一个 widget 移动到另一个太简单了，但在这里我无法通过使用 keyReleaseEvent .

mywindow::mywindow() : QMainWindow()
{   
    widget = new QWidget();
    setCentralWidget(widget);

    tool = new QToolBar();
    vertical = new QVBoxLayout();
    button1 = new QToolButton();
    connect( button1, SIGNAL(clicked()), this, SLOT(fileNew()) );

    button2 = new QToolButton();
    button3 = new QToolButton();

    button1->setIcon(QIcon("download.jpg"));
    button1->setGeometry(0,0,100,200);
    button2->setIcon(QIcon("images.jpg"));
    button3->setIcon(QIcon("settings-icon.jpg"));

    //stack1->addWidget(button1);
    //stack1->addWidget(button2);
    //stack1->addWidget(button3);

    tool->addWidget(button1);
    tool->addWidget(button2);
    tool->addWidget(button3);
    //tool->addWidget(stack1);

    vertical->addWidget(tool);
    widget->setLayout(vertical);
}

void mywindow::keyReleaseEvent(KeyEvent *event)
{
    switch(event->key())
    {
        case:Qt::Key_Left:


    }
}

Answer 1

您需要检查焦点，并根据需要移动焦点。我会这样写:

void mywindow::keyReleaseEvent(KeyEvent *event)
{
    switch(event->key())
    {
        case:Qt::Key_Left:
            if (button3->hasFocus())
                button2->setFocus();
            else if (button2->hasFocus())
                button1->setFocus();
            break;
        case:Qt::Key_Right:
            if (button1->hasFocus())
                button2->setFocus();
            else if (button2->hasFocus())
                button3->setFocus();
            break;
    }
}

请注意，如果您继续添加更多按钮，这段代码很容易变得单调乏味。我会把它们放在一个容器里。然后，我将根据焦点切换逻辑正向和反向遍历该容器。

有关详细信息，请参阅文档:

focus : const bool

This property holds whether this widget (or its focus proxy) has the keyboard input focus.

By default, this property is false.

Note: Obtaining the value of this property for a widget is effectively equivalent to checking whether QApplication::focusWidget() refers to the widget.

Access functions:bool hasFocus() const