[SOLVED]Accessing variables of other QML files

Al0x

Okay, as far as I see I don't have any parent object. At least I can't identify it. (it's not my code)

That's how it is atm:

Button.qml(as in my first post)
File.qml (as in my first post)

MainFile.qml

@
PageGrid {
id: pageGrid
Button {
id: feed1
index: 0
shortcut: Qt.Key_1
}
Button {
id: feed2
index: 1
shortcut: Qt.Key_2
}
Button {
id: feed3
index: 2
shortcut: Qt.Key_3
}
Button {
id: feed4
index: 3
shortcut: Qt.Key_4
}
}
@

In MainFile.qml the Buttons are created.

So, I guess I don't have any object that knows of both nodes (Button & File)?

sierdzio

Correct. So, you actually don't have any place in your application, where File.qml is actually instantiated? How do you expect it to work, then?

I'm sorry, but it's very hard to determine what you actually want to achieve, and what the current situation is - giving advice is now based on guessing on my part.

Al0x

[quote author="sierdzio" date="1345116262"]So, you actually don't have any place in your application, where File.qml is actually instantiated?
[/quote]

How would this instantiation look like?

[quote]
I'm sorry, but it's very hard to determine what you actually want to achieve, and what the current situation is - giving advice is now based on guessing on my part.[/quote]

Thanks for your help anyways. I just want this to work! :P

Again what I want to achieve:

Button.qml is just a common template file for a button.

In MainFile.qml I have a Grid in which the Buttons are created. So, whenever I click on one of these buttons I want to change a property that is located in File.qml

sierdzio

OK. So, you don't use File.qml at all. In order for any QML component to be instantiated, it has to be incorporated into the parent-child hierarchy.

So, in your case it goes like this:

In c++, you have QDeclarativeViewer::setSource("MainFile.qml");
In MainFile, you are using Button.qml, so both have instances now
File.qml is not referenced anywhere in those 2 files, so QML engine will not load it.

Hope that clears this a bit. Now, a somewhat working example would be this:
@
// MainFile.qml
Item {

File {
id: myFile
}

PageGrid {
id: pageGrid
Button {
id: feed1
index: 0
shortcut: Qt.Key_1
onButtonClick: {
myFile.group = 1;
setScreen("MainNewsFeeds")
}
}

Button {
id: feed2
index: 1
shortcut: Qt.Key_2
onButtonClick: {
myFile.group = 2;
setScreen("Bla")
}
}
}
}
// File.qml
Item {
property int group: 0
}
@

Al0x

I actually do use File.qml . Sorry if that wasn't clear.

If I click on a Button in MainFile.qml I want to change a property AND set the screen to File.qml

I tried to let MainFile.qml know, that File.qml exists by adding
@
File {
id: myFile
}
@

Setting the screen works, but I can't find access the id variable, which is in the File.qml, but a child of main.

sierdzio

id is "protected" in that sense - ids are only valid within QML files. If you import a file, id info is not accessible outside. That is why you can and should use QML properties.

Al0x

[quote author="sierdzio" date="1345119488"]id is "protected" in that sense - ids are only valid within QML files. If you import a file, id info is not accessible outside. That is why you can and should use QML properties.[/quote]

I still can't change any property of the item with the id variable.

sierdzio

Try what I wrote before.

As I've noticed, properties that are to be exposed to other QML files need to be defined in top-level item in the source file. So in your code, the group property should be defined in "main" Item, not in "variable" item inside File.qml.

Al0x

Adding the properties to the 'main' - item worked!

Thank you very very much!

sierdzio

Uh, finally :) I'm happy you're ok now.

Best wishes, happy coding!