Tracking when focus leaves a TextField

pavneetarora

This is a quick note on how I ended up solving the problem I outlined earlier in this "thread":http://qt-project.org/forums/viewthread/15444/. I am not entirely happy with the solution, but in case someone else comes down the same path looking for a solution, at least it is one possible way of doing it.

The problem definition is this: I want to be notified when the user leaves a field, presumably after editing it. The page displays a parametric equation so that the other fields may then be computed based on the modified value.

In my TextField definition, I do the following:

@
TextField {
id: x
onActiveFocusChanged: {calcXYObject.toggleExitingField();
calcXYObject.setX(x.text)}
}
@

In my CalcXY C++ class, I put this in the setX (and setY and setZ) members:

@
if (exitingField && (newX != x)) {
x=newX
}
@

where exitingField is a private variable that toggles with every focus change.

As I said, I don't like it, and I hope that there is a better way but this allows me to get something in place until I find a better solution. Ideally, there should be an onExitField event that we can trap.

Regards.

dridk

You should use Qt Property System !
exemple :
@
Field {
value: calcXYObject.valueA
onActiveFocusChanged: calcXYObject.reset()
}

Field {
value: calcXYObject.valueB
onActiveFocusChanged: calcXYObject.reset()
}

Field {
value: calcXYObject.valueC
onActiveFocusChanged: calcXYObject.reset()
}

//================ IN CPP

void CalcXYObject::reset()
{

valueA = .....
valueB = ......
valueC = ......

emit valueAChanged();
emit valueBChanged();
emit valueCChanged();

}

//==================== IN H

class CalcXYObject : public QObject
{
Q_PROPERTY(int valueA READ getValueA WRITE setValueA NOTIFY valueAChanged)
Q_PROPERTY(int valueB READ getValueB WRITE setValueA NOTIFY valueBChanged)
Q_PROPERTY(int valueA READ getValueC WRITE setValueC NOTIFY valueCChanged)

void getValueA(){return mValueA;}
void getValueB(){return mValueB;}
void getValueC(){return mValueC;}

void setValueA(int val){mValueA = val;}
void setValueB(int val){mValueB = val;}
void setValueC(int val){mValueC = val;}

signals:
void valueAChanged();
void valueBChanged();
void valueCChanged();

}

@

pavneetarora

Thanks!

I'll give this a try. Makes more sense.