[SOLVED] Dynamically refer to labels
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Then construct this function using qobject_cast or using QObject function findChild, which uses qobject-cast! Whats the problem? Have you read about qobject_cast already?
@
void YourMainWdiget::SetNamedLabelText(const QString & label_name, const QString & text)
{
QLabel * lbl = this->findChild<QLabel *>(label_name);
if(lbl)lbl->setText(text);
}
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@ThaRez I know this is a very old thread but mine issue is just like yours. Just like you, i too need to refer QLabel dynamically. Using QObject->findChild method makes a perfect sense. But i need to refer even the methods of that QLabel object dynamically.
Any help from your side. -
Then construct this function using qobject_cast or using QObject function findChild, which uses qobject-cast! Whats the problem? Have you read about qobject_cast already?
@
void YourMainWdiget::SetNamedLabelText(const QString & label_name, const QString & text)
{
QLabel * lbl = this->findChild<QLabel *>(label_name);
if(lbl)lbl->setText(text);
}
@ -
@AcerExtensa can we access methods of the QLabel dynamically?
@gaurav118
Hi
What do you mean by dynamically ?QLabel * lbl = this->findChild<QLabel *>(label_name);
if(lbl)lbl->setText(text); <<< this is an actual QLabel method.Can you tell a bit of what you need to do ?
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@gaurav118
Hi
What do you mean by dynamically ?QLabel * lbl = this->findChild<QLabel *>(label_name);
if(lbl)lbl->setText(text); <<< this is an actual QLabel method.Can you tell a bit of what you need to do ?
@mrjj Thanks for your reply
// QLabel * lbl = this->findChild<QLabel *>(label_name);
This way we have reffered the QLabel object. So far so good.
but now as per your example
// if(lbl)lbl->setText(text); <<< this is an actual QLabel method.I dont want to fix this property here. Can i call any other method the same way we refer QLabel control.
Typically saying somehow to use lbl.setProperty("SetText").setValue("Hi") (rubbish code just to make you more clear :-p)
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@mrjj Thanks for your reply
// QLabel * lbl = this->findChild<QLabel *>(label_name);
This way we have reffered the QLabel object. So far so good.
but now as per your example
// if(lbl)lbl->setText(text); <<< this is an actual QLabel method.I dont want to fix this property here. Can i call any other method the same way we refer QLabel control.
Typically saying somehow to use lbl.setProperty("SetText").setValue("Hi") (rubbish code just to make you more clear :-p)
@gaurav118 said in [SOLVED] Dynamically refer to labels:
Can i call any other method the same way we refer QLabel control.
Yes, you can call methods of QLabel.You can also add and remove properties dynamically.
(see setProperty() )But c++ is a compiled languages so you cannot add new methods runtime.
Also "SetText" would be a method.You can of cause make up some tag system so you can lookup exiting members with a "tag"
but i fail to see why it would be helpful in any way.so i guess the answer is no. You cannot just make up new function dynamically.
Maybe there is another solution to your goal if you take the time to describe what you
are trying to build/do -
@gaurav118 said in [SOLVED] Dynamically refer to labels:
Can i call any other method the same way we refer QLabel control.
Yes, you can call methods of QLabel.You can also add and remove properties dynamically.
(see setProperty() )But c++ is a compiled languages so you cannot add new methods runtime.
Also "SetText" would be a method.You can of cause make up some tag system so you can lookup exiting members with a "tag"
but i fail to see why it would be helpful in any way.so i guess the answer is no. You cannot just make up new function dynamically.
Maybe there is another solution to your goal if you take the time to describe what you
are trying to build/do@mrjj You got my point exactly. I am not trying to add new methods in runtime. Obviously cannot do this.
I am actually looking to update the properties of QLabel outside the app and you guessed it right. I am trying to build this using Tag system.Take a look,
<Object Name="LoginUser" Type="QLabel">
<Property="setAlignment" Value="Qt::AlignVCenter|Qt::AlignCenter" />
<Property="setMargin" Value="0" />
<Property="setFixedWidth" Value="180" />
<Property="setStyleSheet" Value="color:white" />
</Object>I haven't used setProperty(), so just looking for some sample code snippet how to use it.
Hopefully by <Object/> tag could brief you what i am actually trying to do. -
Hi,
It's all explained in the method documentation and the The Property System chapter of Qt's documentation.
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Hi
And you might wanna take a look at
http://doc.qt.io/qt-5/quiloader.html
which basically loads a xml and create objects from it.
(.UI files are just xml files)
So depending on your needs, this might also be an option.
