将QKeySequence/QKeySequenceEdit限制为一个快捷方式

Question

是否可以限制QKeySequence在QKeySequenceEdit中只显示一个快捷方式？目前，它支持多达4个快捷方式。我的应用程序只支持一个快捷方式的关键序列，例如Ctrl+A或Ctrl+C，而不是Ctrl+A, D或Ctrl+C, X, Z。

是否可以将QKeySequence或QKeySequenceEdit限制为一个键序列？

Answer 1

解决它，不是最好的解决方案，但quick...If你想要更定制的东西，我认为你必须自己建立它.

customkeysequenceedit.h

#ifndef CUSTOMKEYSEQUENCEEDIT_H
#define CUSTOMKEYSEQUENCEEDIT_H

#include <QKeySequenceEdit>

class QKeyEvent;

class CustomKeySequenceEdit : public QKeySequenceEdit
{
    Q_OBJECT

public:
    explicit CustomKeySequenceEdit(QWidget *parent = 0);
    ~CustomKeySequenceEdit();

protected:
    void keyPressEvent(QKeyEvent *pEvent);
};

#endif // CUSTOMKEYSEQUENCEEDIT_H

customkeysequenceedit.cpp

#include "customkeysequenceedit.h"

#include <QKeyEvent>

CustomKeySequenceEdit::CustomKeySequenceEdit(QWidget *parent) : QKeySequenceEdit(parent) { }

CustomKeySequenceEdit::~CustomKeySequenceEdit() { }

void CustomKeySequenceEdit::keyPressEvent(QKeyEvent *pEvent)
{
    QKeySequenceEdit::keyPressEvent(pEvent);

    QKeySequence seq(QKeySequence::fromString(keySequence().toString().split(", ").first()));
    setKeySequence(seq);

}

Answer 2

您可以使用[]操作符QKeySequence：http://doc.qt.io/qt-5/qkeysequence.html#operator-5b-5d

因此，在您的接口构造函数中，编写如下：

connect(ui->editShortcut, &QKeySequenceEdit::editingFinished, 
        this, &dialog::truncateShortcut);

并将此私有方法添加到您的对话框类中：

void dialog::truncateShortcut()
{
    int value = ui->editShortcut->keySequence()[0];
    QKeySequence shortcut(value);
    ui->editShortcut->setKeySequence(shortcut);
}

这样做，您完全尊重API，并且不依赖于,字符，这是相当危险的。

Answer 3

大多数答案是在输入完成后截断快捷方式。无论如何，将在输入的进程中显示多个短切，这有点烦人。

我找到了一个解决方案，甚至不会显示一个以上的短切。

输入一个快捷方式后，通过清晰焦点完成输入，通过setKeySequence重写 QKeySequenceEdit类keyPressEvent函数。

--而且，这种方法很简单，很优雅！

首先从myKeySequenceEdit创建一个类QKeySequenceEdit，下面是代码：

mykeysequenceedit.h

#ifndef MYKEYSEQUENCEEDIT_H
#define MYKEYSEQUENCEEDIT_H

#include <QKeySequenceEdit>
#include <QWidget>

class myKeySequenceEdit : public QKeySequenceEdit
{
    Q_OBJECT
public:
    myKeySequenceEdit(QWidget *parent = nullptr);

    void keyPressEvent(QKeyEvent *) override;
};

#endif // MYKEYSEQUENCEEDIT_H

mykeysequenceedit.cpp

#include "mykeysequenceedit.h"

myKeySequenceEdit::myKeySequenceEdit(QWidget *parent) : QKeySequenceEdit(parent) {}

void myKeySequenceEdit::keyPressEvent(QKeyEvent *event)
{
    QKeySequenceEdit::keyPressEvent(event);
    if (this->keySequence().count() > 0) {
        QKeySequenceEdit::setKeySequence(this->keySequence());
        
        emit editingFinished(); // Optinal, depend on if you need the editingFinished signal to be triggered
    }
}