Details
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Bug
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Resolution: Done
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P2: Important
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5.2.1
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Windows 7/64 Ultimate
Description
I have a tabbed qml interface (QtQuick 2.2). In one tab there is a parent groupbox and a child groupbox. The child groupbox contains a text area that should expand to consume all available space. I can get the app to behave the way I want. I don't understand why the nested groupbox generates a qml binding loop error on implicitWidth. I'm attaching the entire project but here's a summary of the QML
In the main.qml under ApplicationWindow (all import statements elided)
TabView {
id:frame
anchors.fill: parent
anchors.margins:5
Tab{
id: setupPage
//NOTE if I don't mark active as true then this tab doesn't get created
//until it is clicked on. Not good for trying to set things up.
active:true
objectName:"TabParentOfSetup"
enabled: true
title: "Setup"
SetupTab {
}
}
}
SetupTab.qml looks like this
GroupBox{
title:qsTr("GroupBoxTitle")
signal notifyEvent()
anchors.fill: parent
anchors.margins: 11
ColumnLayout{
anchors.fill: parent
MyTestRow{
Layout.fillHeight: true
Layout.fillWidth: true
}
}
}
Then MyTestRow.qml has
GroupBox{
anchors.margins: 10
title:qsTr("Instrument Messages")
id:myRow
RowLayout{
anchors.fill: parent
TextArea {
id:msgTextBox
Layout.fillWidth: true
Layout.fillHeight: true
}
}
}
The full error message is
Line 14 is the one where MyTestRow is created.qrc:///SetupTab.qml:14:9: QML GroupBox: Binding loop detected for property "implicitWidth"
In the real app there are two tabs and in main.qml for the second tab I had to add the active:true property or the tab didn't load. Quite by accident while preparing the sample project I discovered that if I comment out the active:true the binding error doesn't happen. Unfortunately this is not an viable work-around for the actual application.