Qt如何QProgressDialog如何屏蔽按键Esc及空格键

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  • Post category:其他


1、子类化基类为QProgressDialog,例如为:MyProgressDialog,并重载even事件,头文件h:

#ifndef MYPROGRESSDIALOG_H
#define MYPROGRESSDIALOG_H

#include <QProgressDialog>
#include <QObject>
#include <QWidget>
#include <QtDebug>
#include <QKeyEvent>

class MyProgressDialog : public QProgressDialog
{
    Q_OBJECT
public:
    MyProgressDialog(QWidget *parent = 0);

    bool event(QEvent *event);

};

#endif // MYPROGRESSDIALOG_H

2、子类cpp实现:(这里仅屏蔽Esc,空格键类似,自己添加即可)

#include "myprogressdialog.h"

MyProgressDialog::MyProgressDialog(QWidget *parent) :QProgressDialog(parent)
{

}

bool MyProgressDialog::event(QEvent *event)  // 事件
{
    
    QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event);
    if(keyEvent && keyEvent->key() == Qt::Key_Escape)
    {
        qDebug() <<keyEvent->text();
        qDebug() <<event->type();
        keyEvent->accept();
        return true;
    }
    return QProgressDialog::event(event);

}

3、调用处:

   MyProgressDialog *dlg=new MyProgressDialog(this); //加不加this均可
   dlg->reset(); //Qt5版本的QProgressDialog,创建后会自动弹出,reset一下即可解决
   dlg->show();

4、当按下Esc时,为下面内容:

"\u001B"
QEvent::ShortcutOverride
"\u001B"
QEvent::KeyPress
"\u001B"
QEvent::KeyRelease

“\u001B”就是27,即Esc的键值。由此看出,按键Esc首先触发的是“QEvent::ShortcutOverride”,因此,不能仅简单的处理KeyPress事件。

参考:


1、c++ – Why does QEvent::ShortcutOverride event occur? – Stack Overflow2​​​​​​​2

2、

how to disable ESC key “close” the QProgressDialog ? | Qt Forum



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