How to check whether a widget is text-editable ???

[wshn13]

Now ,there is a widget (or qgraphicswidget ),is there some ways to check whether the widget is text-editable ???Thanks !

[aamer4yu]

You can use dynamic cast to check if the widget belongs to any of the text editable widgets like QLineEdit, QTextEdit , etc.
Hope this helps

[wysota]

Now ,there is a widget (or qgraphicswidget ),is there some ways to check whether the widget is text-editable ???Thanks !

Now or at all?

[wshn13]

You can use dynamic cast to check if the widget belongs to any of the text editable widgets like QLineEdit, QTextEdit , etc.
Hope this helps

Is there some common feature around the text editable widgets like QLineEdit, QTextEdit , etc ?

[wysota]

Yes, they tend to have focus. That's why I asked if you wanted to know whether some widget is a text widget at all or does it currently accept text. The latter can be checked by checking the focus, the former is basically not possible.

[wshn13]

Yes, they tend to have focus. That's why I asked if you wanted to know whether some widget is a text widget at all or does it currently accept text. The latter can be checked by checking the focus, the former is basically not possible.

The situation is that a widget has focus may not be text editable or inputable .Some widgets have focus may be text editable and may be not editable .

[wysota]

No, if a widget has keyboard focus, it accepts key events. That's the exact definition of focus.

[amleto]

e.g. buttons can get focus but aren't text-editable - perhaps that is the distinction the OP is trying to capture.

[wysota]

In that case it is not possible.

[wshn13]

e.g. buttons can get focus but aren't text-editable - perhaps that is the distinction the OP is trying to capture.

So the question is that I want to distinguish whether a foucsed widget is text-editable like qlineedit or not text-editable like button.

[ChrisW67]

You can tell a QLineEdit from a QPushButton in the manner that aamer4yu gave you in the first response.

QWidget *b = new QPushButton("Hello");                                                           
QWidget *m = new MyEdit;                                                                             
QWidget *e = new QLineEdit;                                                                        
QWidget *t = new QTextEdit;                                                                        
 
if (qobject_cast<QLineEdit*>(b)) qDebug() << "b is-a QLineEdit";                                                                  
if (qobject_cast<QLineEdit*>(e)) qDebug() << "e is-a QLineEdit";                                                                  
if (qobject_cast<QLineEdit*>(m)) qDebug() << "m is-a QLineEdit";                                                                  
if (qobject_cast<QLineEdit*>(t)) qDebug() << "t is-a QLineEdit";

QWidget *b = new QPushButton("Hello");                                                           
QWidget *m = new MyEdit;                                                                             
QWidget *e = new QLineEdit;                                                                        
QWidget *t = new QTextEdit;                                                                        
                                                                                                         
if (qobject_cast<QLineEdit*>(b)) qDebug() << "b is-a QLineEdit";                                                                  
if (qobject_cast<QLineEdit*>(e)) qDebug() << "e is-a QLineEdit";                                                                  
if (qobject_cast<QLineEdit*>(m)) qDebug() << "m is-a QLineEdit";                                                                  
if (qobject_cast<QLineEdit*>(t)) qDebug() << "t is-a QLineEdit";

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Actually, the real question is why you want to do this? What are you trying to achieve?

[wshn13]

You can tell a QLineEdit from a QPushButton in the manner that aamer4yu gave you in the first response.

QWidget *b = new QPushButton("Hello");                                                           
QWidget *m = new MyEdit;                                                                             
QWidget *e = new QLineEdit;                                                                        
QWidget *t = new QTextEdit;                                                                        
 
if (qobject_cast<QLineEdit*>(b)) qDebug() << "b is-a QLineEdit";                                                                  
if (qobject_cast<QLineEdit*>(e)) qDebug() << "e is-a QLineEdit";                                                                  
if (qobject_cast<QLineEdit*>(m)) qDebug() << "m is-a QLineEdit";                                                                  
if (qobject_cast<QLineEdit*>(t)) qDebug() << "t is-a QLineEdit";

QWidget *b = new QPushButton("Hello");                                                           
QWidget *m = new MyEdit;                                                                             
QWidget *e = new QLineEdit;                                                                        
QWidget *t = new QTextEdit;                                                                        
                                                                                                         
if (qobject_cast<QLineEdit*>(b)) qDebug() << "b is-a QLineEdit";                                                                  
if (qobject_cast<QLineEdit*>(e)) qDebug() << "e is-a QLineEdit";                                                                  
if (qobject_cast<QLineEdit*>(m)) qDebug() << "m is-a QLineEdit";                                                                  
if (qobject_cast<QLineEdit*>(t)) qDebug() << "t is-a QLineEdit";

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Actually, the real question is why you want to do this? What are you trying to achieve?

The reason is that when a foucus event come ,I want my custom input method popup if the focused widget is actually text-editable like qlineedit ,but if the focued widget is not actually text-editable the input method should not be popup .

[wysota]

Why don't you just provide an input method plugin (see QInputContextPlugin and family)?