ux:Binding

ux:Binding is used to explicitly choose which property a UX object should bind to.

Syntax

<type ux:Binding="some_property" />

Remarks

It is seldom necessary, but there are a few cases where we need to explicitly bind to another property than the default. An example can be found in the chapter about ux:Dependency and how those are forwarded using ux:Binding. Here are a few other examples:

The Container class

In the following example we have to explicitly bind the Rectangle to the Children property of Container using ux:Binding. This is because Container doesn't have Children as its default property. It instead forwards its child elements to the element specified by its Subtree property.

<Container ux:Class="MyContainer" Subtree="innerPanel">
    <Rectangle ux:Binding="Children" CornerRadius="10" Margin="10">
        <Stroke Color="Red" Width="2" />
        <Panel Margin="10" ux:Name="innerPanel" />
    </Rectangle>
</Container>

Specifying different forward and backward easing with CubicBezierEasing

<Move X="100" Duration="0.3">
    <CubicBezierEasing ux:Binding="Easing" ControlPoints="0.4, 0.0, 1.0, 1.0" />
    <CubicBezierEasing ux:Binding="EasingBack" ControlPoints="0.3, 0.0, 0.3, 1.0" />
</Move>

In the above example, we have to use ux:Binding in order to explicitly bind the two CubicBezierEasing objects to different properties. Otherwise, they would both try to bind to the default property of Move, which for CubicBezierEasing would be the Easing property.

ux:AutoBind

The ux:AutoBind attribute is used to specify whether a UX object should automatically bind to the default property (that matches its type) of its parent. This is something we normally don't have to think about, except for a few edge-cases.

Syntax

<type ux:AutoBind="true/false" />

Remarks

<StackPanel>
    <Text Value="Hello" />
    <Rectangle Color="Red" />
</StackPanel>

In the above example, the Text and Rectangle are automatically bound to the Children property of the StackPanel this is an implementation detail we usually shouldn't worry about, but for the cases we do, we can use ux:AutoBind to turn of that behavior:

<StackPanel>
    <Text Value="Hello" ux:AutoBind="false" />
    <Rectangle Color="Red" ux:AutoBind="false"/>
</StackPanel>

In the above example, we end up with two "free floating" elements which can be bound to properties by using ux:Binding.