QML - reference to image element

ben80

Hi everyone,

Is it possible in qml to use some kind of a reference to an image element and then use this reference to set properties?

I have two image elements (id:img1, id:img2).
Depending on the value of a signal i would like to change several properties, either of img1 or of img2.

Example:
imgX = <Referenc_to_img1>
imgX.width : 100
imgX.x : 200
imgX.source : <filename>
...

Thanks for any help,

Ben

dcape

Yep, you can do: var imgX = img1 ...assuming you're setting imgX in the same function you're manipulating the properties.
Here's an example but using rectangles:

function changeImage() {
    var imgX = img1;
    imgX.width = 150;
    imgX.height = 50;
}

Rectangle {
    id: img1
    color: "red"
    width: 100
    height: 100
}
Rectangle {
    id: img2
    color: "blue"
    x: 200
    width: 100
    height: 100
}

xargs1

function f() {
    var imgX;
    imgX = img1;
    imgX.source = filename;
}

Alternately, imgX could be a property if you need it to have wider scope:

property var imgX

ben80

Cool, thanks. The first solution works well.

When using the "property" solution, why does the following code not work?
-> Error while compiling: "Cannot assign a value directly to a grouped property"

property var idX
idX : rectRed
idX.color : "green" -> ERROR

Rectangle{
    id : rectRed
    color: "red"
}

xargs1

We can't tell what you're doing from a couple of lines of code with no context. Where are you declaring the property and trying to do "idX.color: "green"? The colon is a binding operator, not an assignment; you can't use it in place of an = operator everywhere.

ben80

I'm sorry, i wanted to keep the post short. Here comes my testcode.
Thanks for your help,
Ben

import QtQuick 2.3
import QtQuick.Window 2.2

Window {
visible: true
width: 360
height: 360

Rectangle{
    id : top
    anchors.fill: parent

    property var idX
    idX : rectRed
    idX.color : "green"

     Rectangle{
        id : rectRed
        width : 100
        height: width
        color: "red"
    }
}

}

xargs1

You can do "idX.color = "green" in a JavaScript context, but I don't think you can do a binding like that.

ben80

ok, thanks a lot.
The variable inside a js function works well for me.
Ben