Xamarin Forms User Control: Forward Entry.Behaviors dependency property in composite control
I created a user control in which I placed an Xamarin.Forms Entry. The idea is to wrap the original Entry with some additional funtionality such as an input validation error, images, etc... and use the composite control all over my Xamarin.Forms app. Nothing special so far.
All relevant dependency properties of Entry are forwarded to the wrapping composite control, e.g. Text, Style. Now, the problem comes when I want to expose a dependency property for Behavoirs which I want to forward to the nested Entry control.
Does anyone have experience in “forwarding” nested dependency properties, in particular with Behaviors?
Update 2018-11-25:
ValidatableEntry.xaml is a Grid which contains the nested Entry control. Text and Placeholder properties of Entry are bound to local dependency properties, I call this approach "property forwarding".
<?xml version="1.0" encoding="UTF-8"?>
<Grid
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="ValidatableEntry"
x:Name="Control">
<Entry
Grid.Row="0"
x:Name="Entry"
Text="{Binding Text, Source={x:Reference Control}, Mode=TwoWay}"
Placeholder="{Binding Placeholder, Source={x:Reference Control}, Mode=OneWay}">
</Entry>
</Grid>
ValidatableEntry.xaml.cs contains the exposed dependency properties, TextPropery and PlaceholderProperty. The question is: How can I forward the Behaviors property? I tried following, which doesn't work:
public new static readonly BindableProperty BehaviorsProperty =
BindableProperty.Create(
nameof(Behaviors),
typeof(IList<Behavior>),
typeof(ValidatableEntry),
default(IList<Behavior>),
BindingMode.OneWayToSource);
public new IList<Behavior> Behaviors
{
get { return (IList<Behavior>)this.Entry.GetValue(VisualElement.BehaviorsProperty); }
}
forms xamarin xamarin.forms dependency-properties behavior
asked Nov 24 '18 at 20:02
thomasgallikerthomasgalliker
7610
add a comment |
I created a user control in which I placed an Xamarin.Forms Entry. The idea is to wrap the original Entry with some additional funtionality such as an input validation error, images, etc... and use the composite control all over my Xamarin.Forms app. Nothing special so far.
All relevant dependency properties of Entry are forwarded to the wrapping composite control, e.g. Text, Style. Now, the problem comes when I want to expose a dependency property for Behavoirs which I want to forward to the nested Entry control.
Does anyone have experience in “forwarding” nested dependency properties, in particular with Behaviors?
Update 2018-11-25:
ValidatableEntry.xaml is a Grid which contains the nested Entry control. Text and Placeholder properties of Entry are bound to local dependency properties, I call this approach "property forwarding".
<?xml version="1.0" encoding="UTF-8"?>
<Grid
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="ValidatableEntry"
x:Name="Control">
<Entry
Grid.Row="0"
x:Name="Entry"
Text="{Binding Text, Source={x:Reference Control}, Mode=TwoWay}"
Placeholder="{Binding Placeholder, Source={x:Reference Control}, Mode=OneWay}">
</Entry>
</Grid>
ValidatableEntry.xaml.cs contains the exposed dependency properties, TextPropery and PlaceholderProperty. The question is: How can I forward the Behaviors property? I tried following, which doesn't work:
public new static readonly BindableProperty BehaviorsProperty =
BindableProperty.Create(
nameof(Behaviors),
typeof(IList<Behavior>),
typeof(ValidatableEntry),
default(IList<Behavior>),
BindingMode.OneWayToSource);
public new IList<Behavior> Behaviors
{
get { return (IList<Behavior>)this.Entry.GetValue(VisualElement.BehaviorsProperty); }
}
forms xamarin xamarin.forms dependency-properties behavior
asked Nov 24 '18 at 20:02
thomasgallikerthomasgalliker
7610
Can you provide some code to explain better what you're saying ?
– FabriBertani
Nov 24 '18 at 22:58
Yep. This is a good idea. I’ll be back with a condensed snipped.
– thomasgalliker
Nov 25 '18 at 0:04
add a comment |
I created a user control in which I placed an Xamarin.Forms Entry. The idea is to wrap the original Entry with some additional funtionality such as an input validation error, images, etc... and use the composite control all over my Xamarin.Forms app. Nothing special so far.
All relevant dependency properties of Entry are forwarded to the wrapping composite control, e.g. Text, Style. Now, the problem comes when I want to expose a dependency property for Behavoirs which I want to forward to the nested Entry control.
Does anyone have experience in “forwarding” nested dependency properties, in particular with Behaviors?
Update 2018-11-25:
ValidatableEntry.xaml is a Grid which contains the nested Entry control. Text and Placeholder properties of Entry are bound to local dependency properties, I call this approach "property forwarding".
<?xml version="1.0" encoding="UTF-8"?>
<Grid
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="ValidatableEntry"
x:Name="Control">
<Entry
Grid.Row="0"
x:Name="Entry"
Text="{Binding Text, Source={x:Reference Control}, Mode=TwoWay}"
Placeholder="{Binding Placeholder, Source={x:Reference Control}, Mode=OneWay}">
</Entry>
</Grid>
ValidatableEntry.xaml.cs contains the exposed dependency properties, TextPropery and PlaceholderProperty. The question is: How can I forward the Behaviors property? I tried following, which doesn't work:
public new static readonly BindableProperty BehaviorsProperty =
BindableProperty.Create(
nameof(Behaviors),
typeof(IList<Behavior>),
typeof(ValidatableEntry),
default(IList<Behavior>),
BindingMode.OneWayToSource);
public new IList<Behavior> Behaviors
{
get { return (IList<Behavior>)this.Entry.GetValue(VisualElement.BehaviorsProperty); }
}
forms xamarin xamarin.forms dependency-properties behavior
asked Nov 24 '18 at 20:02
thomasgallikerthomasgalliker
7610
I created a user control in which I placed an Xamarin.Forms Entry. The idea is to wrap the original Entry with some additional funtionality such as an input validation error, images, etc... and use the composite control all over my Xamarin.Forms app. Nothing special so far.
All relevant dependency properties of Entry are forwarded to the wrapping composite control, e.g. Text, Style. Now, the problem comes when I want to expose a dependency property for Behavoirs which I want to forward to the nested Entry control.
Does anyone have experience in “forwarding” nested dependency properties, in particular with Behaviors?
Update 2018-11-25:
ValidatableEntry.xaml is a Grid which contains the nested Entry control. Text and Placeholder properties of Entry are bound to local dependency properties, I call this approach "property forwarding".
<?xml version="1.0" encoding="UTF-8"?>
<Grid
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="ValidatableEntry"
x:Name="Control">
<Entry
Grid.Row="0"
x:Name="Entry"
Text="{Binding Text, Source={x:Reference Control}, Mode=TwoWay}"
Placeholder="{Binding Placeholder, Source={x:Reference Control}, Mode=OneWay}">
</Entry>
</Grid>
ValidatableEntry.xaml.cs contains the exposed dependency properties, TextPropery and PlaceholderProperty. The question is: How can I forward the Behaviors property? I tried following, which doesn't work:
public new static readonly BindableProperty BehaviorsProperty =
BindableProperty.Create(
nameof(Behaviors),
typeof(IList<Behavior>),
typeof(ValidatableEntry),
default(IList<Behavior>),
BindingMode.OneWayToSource);
public new IList<Behavior> Behaviors
{
get { return (IList<Behavior>)this.Entry.GetValue(VisualElement.BehaviorsProperty); }
}
forms xamarin xamarin.forms dependency-properties behavior
forms xamarin xamarin.forms dependency-properties behavior
asked Nov 24 '18 at 20:02
thomasgallikerthomasgalliker
7610
asked Nov 24 '18 at 20:02
thomasgallikerthomasgalliker
7610
edited Nov 25 '18 at 18:26
thomasgalliker
asked Nov 24 '18 at 20:02
thomasgallikerthomasgalliker
7610
asked Nov 24 '18 at 20:02
thomasgallikerthomasgalliker
7610
asked Nov 24 '18 at 20:02
thomasgallikerthomasgalliker
7610
7610
Can you provide some code to explain better what you're saying ?
– FabriBertani
Nov 24 '18 at 22:58
Yep. This is a good idea. I’ll be back with a condensed snipped.
– thomasgalliker
Nov 25 '18 at 0:04
add a comment |
Can you provide some code to explain better what you're saying ?
– FabriBertani
Nov 24 '18 at 22:58
Yep. This is a good idea. I’ll be back with a condensed snipped.
– thomasgalliker
Nov 25 '18 at 0:04
Can you provide some code to explain better what you're saying ?
– FabriBertani
Nov 24 '18 at 22:58
Can you provide some code to explain better what you're saying ?
– FabriBertani
Nov 24 '18 at 22:58
Yep. This is a good idea. I’ll be back with a condensed snipped.
– thomasgalliker
Nov 25 '18 at 0:04
Yep. This is a good idea. I’ll be back with a condensed snipped.
– thomasgalliker
Nov 25 '18 at 0:04
add a comment |
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Can you provide some code to explain better what you're saying ?
– FabriBertani
Nov 24 '18 at 22:58
Yep. This is a good idea. I’ll be back with a condensed snipped.
– thomasgalliker
Nov 25 '18 at 0:04