Qt Reference Documentation

QML AnchorChanges Element

The AnchorChanges element allows you to change the anchors of an item in a state. More...


Detailed Description

The AnchorChanges element is used to modify the anchors of an item in a State.

AnchorChanges cannot be used to modify the margins on an item. For this, use PropertyChanges intead.

In the following example we change the top and bottom anchors of an item using AnchorChanges, and the top and bottom anchor margins using PropertyChanges:

 import QtQuick 1.0

 Rectangle {
     id: window
     width: 120; height: 120
     color: "black"

     Rectangle { id: myRect; width: 50; height: 50; color: "red" }

     states: State {
         name: "reanchored"

         AnchorChanges {
             target: myRect
             anchors.top: window.top
             anchors.bottom: window.bottom
         PropertyChanges {
             target: myRect
             anchors.topMargin: 10
             anchors.bottomMargin: 10

     MouseArea { anchors.fill: parent; onClicked: window.state = "reanchored" }

AnchorChanges can be animated using AnchorAnimation.

 //animate our anchor changes
 Transition {
     AnchorAnimation {}

Margin animations can be animated using NumberAnimation.

For more information on anchors see Anchor Layouts.

Property Documentation

anchors.left : AnchorLine

anchors.right : AnchorLine

anchors.horizontalCenter : AnchorLine

anchors.top : AnchorLine

anchors.bottom : AnchorLine

anchors.verticalCenter : AnchorLine

anchors.baseline : AnchorLine

These properties change the respective anchors of the item.

To reset an anchor you can assign undefined:

 AnchorChanges {
     target: myItem
     anchors.left: undefined          //remove myItem's left anchor
     anchors.right: otherItem.right

target : Item

This property holds the Item for which the anchor changes will be applied.