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Merge pull request #1164 from PrismLibrary/TabbedPage-NavigationPage-…
…IActiveAware added support for ActiveAware NavPages in a TabbedPage
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38 changes: 38 additions & 0 deletions
38
Source/Xamarin/Prism.Forms/Behaviors/NavigationPageActiveAwareBehavior.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| using Prism.Common; | ||
| using Xamarin.Forms; | ||
|
|
||
| namespace Prism.Behaviors | ||
| { | ||
| public class NavigationPageActiveAwareBehavior : BehaviorBase<NavigationPage> | ||
| { | ||
| protected override void OnAttachedTo(NavigationPage bindable) | ||
| { | ||
| bindable.PropertyChanging += NavigationPage_PropertyChanging; | ||
| bindable.PropertyChanged += NavigationPage_PropertyChanged; | ||
| base.OnAttachedTo(bindable); | ||
| } | ||
|
|
||
| protected override void OnDetachingFrom(NavigationPage bindable) | ||
| { | ||
| bindable.PropertyChanging -= NavigationPage_PropertyChanging; | ||
| bindable.PropertyChanged -= NavigationPage_PropertyChanged; | ||
| base.OnDetachingFrom(bindable); | ||
| } | ||
|
|
||
| private void NavigationPage_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) | ||
| { | ||
| if (e.PropertyName == "CurrentPage") | ||
| { | ||
| PageUtilities.InvokeViewAndViewModelAction<IActiveAware>(AssociatedObject.CurrentPage, (obj) => obj.IsActive = true); | ||
| } | ||
| } | ||
|
|
||
| private void NavigationPage_PropertyChanging(object sender, PropertyChangingEventArgs e) | ||
| { | ||
| if (e.PropertyName == "CurrentPage") | ||
| { | ||
| PageUtilities.InvokeViewAndViewModelAction<IActiveAware>(AssociatedObject.CurrentPage, (obj) => obj.IsActive = false); | ||
| } | ||
| } | ||
| } | ||
| } |