Question

我想创建一个按钮，当用户右键单击按钮时，会出现一个上下文菜单，让用户可以选择替换按钮上的文本。当用户选择替换选项时，他们可以编辑按钮本身的文本标签。

我已经右键单击以创建上下文菜单，我可以拦截关键事件来更改标签，但是当我这样做时，我必须处理所有各种键盘功能，就像删除一样，为自己。

我想知道是否有更好的方法来做到这一点。有没有办法可以在按钮上放置QLineEdit来编辑按钮文本？

这是我开始使用的代码。

EventButton::EventButton(QWidget *parent) : 
    QPushButton(parent) 
{ }

void EventButton::mousePressEvent(QMouseEvent *e) {
    if (e->button() == Qt::RightButton) {
        QMenu contextMenu;
        contextMenu.addAction("Replace Text", this, [=] {
            this->grabKeyboard();
            this->setText("");
        });

        QPoint globalPos = mapToGlobal(e->pos());
        contextMenu.exec(globalPos);
    } else {
        emit clicked();
    }
}

void EventButton::keyPressEvent(QKeyEvent *e) {
    // Check for return key
    if ((e->key() == Qt::Key_Enter) || (e->key() == Qt::Key_Return)) {
         this->releaseKeyboard();
         emit buttonTitleChanged(this->text());
    } else {
         QString text = this->text();
         text.append(e->key());
         this->setText(text);
    }
}

Answer 1

您只需在按钮中添加QLineEdit个孩子即可。我还会给按钮一个网格布局，以自动处理行编辑定位和调整大小并覆盖contextMenuEvent以显示菜单，最终得到如下内容：

#include <QPushButton>
#include <QMenu>
#include <QAction>
#include <QContextMenuEvent>
#include <QGridLayout>
class EventButton : public QPushButton
{
    Q_OBJECT
    QLineEdit * lineEdit;
public:
    explicit EventButton(const QString &text, QWidget *parent) :
        QPushButton(text, parent)
    {
        lineEdit = new QLineEdit();
        lineEdit->setAlignment(Qt::AlignCenter | Qt::AlignHCenter);
        lineEdit->setSizePolicy(QSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding));
        connect(lineEdit, &QLineEdit::editingFinished, [=](){
                    setText(lineEdit->text());
                    lineEdit->hide();
                });

        QGridLayout * gridlayout = new QGridLayout();
        gridlayout->setMargin(0);
        setLayout(gridlayout);
        gridlayout->addWidget(lineEdit);
        lineEdit->hide();
    }
protected:
    void contextMenuEvent(QContextMenuEvent *event) override
    {
        QMenu contextMenu;
        contextMenu.addAction("Replace Text", this, [=] {
            QString text = this->text();
            lineEdit->setText(text);
            lineEdit->setSelection(0, text.size());
            lineEdit->show();
            lineEdit->setFocus();
        });

        QPoint globalPos = mapToGlobal(event->pos());
        contextMenu.exec(globalPos);
    }
};

Qt - 右键点击

1 个答案: