August 15, 2012

PGPoulsen PGPoulsen
Lab Rat
3 posts

[SOLVED (work-around)] QML Calling overriden functions

 

Hi, I’m playing with inheritance in QML and don’t know how to call an overridden function. Below is a simple example that, hopefully, explains what I’m trying to do.

Thanks in advance.
Yours
/peter

Parent.qml:

  1. import QtQuick 1.1
  2.  
  3. Rectangle {
  4.     function foo() {
  5.         console.log("Foo in parent")
  6.     }
  7. }

Child.qml:

  1. import QtQuick 1.1
  2.  
  3. Parent {
  4.     function foo() {
  5.         console.log("Foo in child")
  6.       //  here is the problem. Would like to do something like: Parent::foo()
  7.     }
  8. }

Output:

  1. Foo in child

While I would like it to be:

  1. Foo in child
  2. Foo in parent

7 replies

August 15, 2012

sierdzio sierdzio
Area 51 Engineer
2314 posts
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No time to check myself at the moment, but have you tried this:

  1. import QtQuick 1.1
  2.  
  3. Parent {
  4.     id: root
  5.  
  6.     function foo() {
  7.         root.foo();
  8.         console.log("Foo in child")
  9.     }
  10. }

Probably won’t work, or will introduce some nasty loop, but worth a try nonetheless.

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August 15, 2012

PGPoulsen PGPoulsen
Lab Rat
3 posts

Thanks for you answer, but unfortunately it does go into a nasty loop :-(

August 15, 2012

sierdzio sierdzio
Area 51 Engineer
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A kind of a workaround, if you are interested in those, would be this:

  1. // Parent
  2. import QtQuick 1.1
  3.  
  4. Rectangle {
  5.  
  6.     signal foo();
  7.     onFoo: {
  8.         console.log("Foo in parent");
  9.     }
  10. }
  11.  
  12. // Kid
  13. import QtQuick 1.1
  14.  
  15. Parent {
  16.     id: root
  17.  
  18.     onFoo: {
  19.         console.log("Foo in child");
  20.     }
  21. }

This time I’ve checked – it works :)

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August 15, 2012

sierdzio sierdzio
Area 51 Engineer
2314 posts
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Although in a reversed order to the one you were interested in. Parent reports first.

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August 16, 2012

chriadam chriadam
Ant Farmer
181 posts

https://bugreports.qt-project.org/browse/QTBUG-25942 and https://bugreports.qt-project.org/browse/QTBUG-26357 are related to this issue. Both of these are in scope for Qt 5.1.

Cheers,
Chris.

August 16, 2012

sierdzio sierdzio
Area 51 Engineer
2314 posts
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Good to know, thanks!

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August 16, 2012

PGPoulsen PGPoulsen
Lab Rat
3 posts

Thanks for all your answers. Very helpful :-)

 
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