Using custom Q_PROPERTY with Stylesheet

[hubbobubbo]

Hi

I have added a custom Q_PROPERTY like this:

Q_PROPERTY( bool isTalking READ isTalking WRITE setIsTalking )

bool _isTalking;

public:
MyClass(QWidget *parent );
~MyClass();

bool isTalking() const {return _isTalking;}
void setIsTalking(bool newIsTalking){_isTalking = newIsTalking;}

Then from my style sheet file I want to change the background color of a QTreeWidgetItem based on this Q_PROPERTY like this:

QTreeWidget#activeCalls::item:isTalking{
background: green;
}

However this has no effect. Using a normal property on the QTreeWidget like this works though:
QTreeWidget#activeCalls::item:selected{
background: grey;
}

So the Widget is named correctly but I do not think the item is updated based on the value of my cusomt Q_PROPERTY. How can I make sure the Widget is updated when my property changes so the correct stylesheet is applied dynamically.

[Lykurg]

QTreeWidget#activeCalls::item:selected{
background: grey;
}
You can not access all properties like that. It's only a bunch of properties you can use that way (called pseudo states). You can try to use something like that:QTreeWidget#activeCalls[isTalking="true"]

[SABROG]

You must know, what Style Sheets added to QWidget only once and if you change QMetaProperty value later this do not change style with other rule.

[hubbobubbo]

Hi

I tried like this (changed to int to make it even simpler)

QTreeWidget#activeCalls::item[isTalking="0"]{
background: green;
}

QTreeWidget#activeCalls::item[isTalking="1"]{
background: yellow;
}

in the code I simple call setIsTalking(0) or setIsTalking(1)

Still no action at all though.

[Lykurg]

SABROG gave you the answer: you have to reaply the style sheet every time you change this property. So your approach doesn't seem to be the best. Without knowing exactely what you are doing, I would recomend you to use a custom item delegate where you can paint different backgrounds depending on the items "property". Or if you add widgets, use the widgets paint methode.

[hubbobubbo]

Ok thanks I will give up on that approach.

[SABROG]

Still no action at all though.
It's standard behaviour. Trolls don't want change this. I created bugreport about one year ago and he's been rejected.

[mrandreas]

I used this approach:



Q_PROPERTY( bool isTalking
READ isTalking
WRITE setIsTalking
DESGNABLE true
SCRIPTABLE true)

bool _isTalking;
QFileSystemWatcher* _watch

public:
MyClass(QWidget *parent ) :
QWidget(parent)
{
this->setObjectName("MyClass");
_watch->addPath("xxxx.css");
connect(_watch, SIGNAL(fileChanged(QString),
this,SLOT(loadStyleSheet(QString)));

}
~MyClass();

bool isTalking() const
{return _isTalking;}
void setIsTalking(bool newIsTalking)
{_isTalking = newIsTalking;}

public slots:
void loadStyleSheet(const QString& css)
{
QFile cssfile(css);

if(cssfile.open(QIODevice::ReadOnly
| IODevice::Text))
{
QTextStream in(&cssFile);
QString cssssss(in.readAll());
this->setStyleSheet(csssss);
}

}


In the css:


MyClass{qproperty-isTalking: true;}

However - changing properties from css file should not be used for all purposes (at least >5 pr second). it will be slooow.