[Interest] React to signal only when at top of StackView

[Elvis Stansvik]

2016-05-06 22:41 GMT+02:00 J-P Nurmi <jpnurmi at qt.io>:
>> On 06 May 2016, at 22:27, Elvis Stansvik <elvstone at gmail.com> wrote:
>>
>> Hi all,
>>
>> I want that an item reacts to a certain signal only when it is at the
>> top of a StackView, so I tried something like:
>>
>>                Connections {
>>                    // Below won't work:
>>                    target: Stack.status === Stack.Active ? button : null
>>                    //target: button // ..but this works
>>                    onClicked: console.log("clicked")
>>                }
>>
>> That is, making the target of the connection null unless Stack.status
>> == Stack.Active, but it seems it's not working.
>>
>> Full example below:
>>
>> import QtQuick 2.4
>> import QtQuick.Controls 1.3
>> import QtQuick.Window 2.2
>>
>> Window {
>>    id: window
>>    width: 500
>>    height: 500
>>    visible: true
>>
>>    Column {
>>        Rectangle {
>>            width: 100
>>            height: 100
>>            color: "gray"
>>
>>            MouseArea {
>>                id: button
>>                anchors.fill: parent
>>                Text {
>>                    text: "Click Me"
>>                    anchors.centerIn: parent
>>                }
>>            }
>>        }
>>
>>        StackView {
>>            id: stackView
>>            width: 100
>>            height: 100
>>
>>            initialItem: Rectangle {
>>                anchors.fill: parent
>>                color: "green"
>>                Connections {
>>                    // Below won't work:
>>                    target: Stack.status === Stack.Active ? button : null
>>                    //target: button // ..but this works
>>                    onClicked: console.log("clicked")
>>                }
>>            }
>>        }
>>    }
>> }
>>
>> Anyone know what the problem might be? The item here is definitely
>> active on the stack, since it's the initial (and only item).
>>
>
> Hi,
>
> The Stack.status property must be attached to an item that is in a StackView. In the snippet above, it is attached to the Connections element. You can give the Rectangle element an id to be able to attach the property to it instead.

Ah, that makes perfect sense *facepalm*. Thanks J-P!

Elvis

>
>             initialItem: Rectangle {
>                id: rect // <==
>                anchors.fill: parent
>                color: "green"
>                Connections {
>                    target: rect.Stack.status === rect.Stack.Active ? button : null // <==
>                    onClicked: console.log("clicked")
>                }
>            }
>
> --
> J-P Nurmi
>
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