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Moved code into *.Properties.cs file, wired up IsAlwaysOn flag

This commit is contained in:
Darren Batchelor 2021-10-13 16:35:37 -07:00
Родитель d766b9ee59
Коммит 7ef191888a
4 изменённых файлов: 82 добавлений и 80 удалений
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2
Microsoft.Toolkit.Uwp.SampleApp/SamplePages/ViewportBehavior/ViewportBehaviorPage.xaml
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@ -7,7 +7,7 @@
xmlns:behaviors="using:Microsoft.Toolkit.Uwp.UI.Behaviors"
mc:Ignorable="d">
<Page.Resources>
<behaviors:ViewportBehavior x:Key="ViewportBehavior" IsAlwaysOn="True"/>
<behaviors:ViewportBehavior x:Key="ViewportBehavior" />
</Page.Resources>
<Grid>

2
Microsoft.Toolkit.Uwp.SampleApp/SamplePages/ViewportBehavior/ViewportBehaviorXaml.bind
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@ -14,7 +14,7 @@
Height="200"
Background="Gray">
<interactivity:Interaction.Behaviors>
<behaviors:ViewportBehavior x:Name="ViewportBehavior" />
<behaviors:ViewportBehavior x:Name="ViewportBehavior" IsAlwaysOn="@[IsAlwaysOn:Bool:True]" />
</interactivity:Interaction.Behaviors>
<Image x:Name="EffectElement"
Width="100"

80
Microsoft.Toolkit.Uwp.UI.Behaviors/Viewport/ViewportBehavior.Properties.cs
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@ -1,9 +1,25 @@
using System;
using Windows.UI.Xaml;
namespace Microsoft.Toolkit.Uwp.UI.Behaviors
{
public partial class ViewportBehavior
{
/// <summary>
/// The IsFullyInViewport value of the associated element
/// </summary>
public static readonly DependencyProperty IsFullyInViewportProperty =
DependencyProperty.Register(nameof(IsFullyInViewport), typeof(bool), typeof(ViewportBehavior), new PropertyMetadata(default(bool), OnIsFullyInViewportChanged));
/// <summary>
/// The IsInViewport value of the associated element
/// </summary>
public static readonly DependencyProperty IsInViewportProperty =
DependencyProperty.Register(nameof(IsInViewport), typeof(bool), typeof(ViewportBehavior), new PropertyMetadata(default(bool), OnIsInViewportChanged));
/// <summary>
/// The IsAlwaysOn value of the associated element
/// </summary>
public static readonly DependencyProperty IsAlwaysOnProperty =
DependencyProperty.Register(nameof(IsAlwaysOn), typeof(bool), typeof(ViewportBehavior), new PropertyMetadata(true));
@ -15,5 +31,69 @@ namespace Microsoft.Toolkit.Uwp.UI.Behaviors
get { return (bool)GetValue(IsAlwaysOnProperty); }
set { SetValue(IsAlwaysOnProperty, value); }
}
/// <summary>
/// Gets a value indicating whether associated element is fully in the ScrollViewer viewport
/// </summary>
public bool IsFullyInViewport
{
get { return (bool)GetValue(IsFullyInViewportProperty); }
private set { SetValue(IsFullyInViewportProperty, value); }
}
/// <summary>
/// Gets a value indicating whether associated element is in the ScrollViewer viewport
/// </summary>
public bool IsInViewport
{
get { return (bool)GetValue(IsInViewportProperty); }
private set { SetValue(IsInViewportProperty, value); }
}
/// <summary>
/// Event tracking when the object is fully within the viewport or not
/// </summary>
/// <param name="d">ViewportBehavior</param>
/// <param name="e">EventArgs</param>
private static void OnIsFullyInViewportChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var obj = (ViewportBehavior)d;
var value = (bool)e.NewValue;
if (obj.IsAlwaysOn)
{
if (value)
{
obj.EnteredViewport?.Invoke(obj.AssociatedObject, EventArgs.Empty);
}
else
{
obj.ExitingViewport?.Invoke(obj.AssociatedObject, EventArgs.Empty);
}
}
}
/// <summary>
/// Event tracking the state of the object as it moves in and out of the viewport
/// </summary>
/// <param name="d">ViewportBehavior</param>
/// <param name="e">EventArgs</param>
private static void OnIsInViewportChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var obj = (ViewportBehavior)d;
var value = (bool)e.NewValue;
if (obj.IsAlwaysOn)
{
if (value)
{
obj.EnteringViewport?.Invoke(obj.AssociatedObject, EventArgs.Empty);
}
else
{
obj.ExitedViewport?.Invoke(obj.AssociatedObject, EventArgs.Empty);
}
}
}
}
}

78
Microsoft.Toolkit.Uwp.UI.Behaviors/Viewport/ViewportBehavior.cs
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@ -21,24 +21,6 @@ namespace Microsoft.Toolkit.Uwp.UI.Behaviors
/// </summary>
private ScrollViewer _hostScrollViewer;
/// <summary>
/// The IsFullyInViewport value of the associated element
/// </summary>
public static readonly DependencyProperty IsFullyInViewportProperty =
DependencyProperty.Register(nameof(IsFullyInViewport), typeof(bool), typeof(ViewportBehavior), new PropertyMetadata(default(bool), OnIsFullyInViewportChanged));
/// <summary>
/// The IsInViewport value of the associated element
/// </summary>
public static readonly DependencyProperty IsInViewportProperty =
DependencyProperty.Register(nameof(IsInViewport), typeof(bool), typeof(ViewportBehavior), new PropertyMetadata(default(bool), OnIsInViewportChanged));
/// <summary>
/// The IsAlwaysOn value of the associated element
/// </summary>
//public static readonly DependencyProperty IsAlwaysOnProperty =
// DependencyProperty.Register(nameof(IsAlwaysOn), typeof(bool), typeof(ViewportBehavior), new PropertyMetadata(true));
/// <summary>
/// Associated element fully enter the ScrollViewer viewport event
/// </summary>
@ -59,33 +41,6 @@ namespace Microsoft.Toolkit.Uwp.UI.Behaviors
/// </summary>
public event EventHandler ExitingViewport;
///// <summary>
///// Gets or sets a value indicating whether this behavior will remain attached after the associated element enters the viewport. When false, the behavior will remove itself after entering.
///// </summary>
//public bool IsAlwaysOn
//{
// get { return (bool)GetValue(IsAlwaysOnProperty); }
// set { SetValue(IsAlwaysOnProperty, value); }
//}
/// <summary>
/// Gets a value indicating whether associated element is fully in the ScrollViewer viewport
/// </summary>
public bool IsFullyInViewport
{
get { return (bool)GetValue(IsFullyInViewportProperty); }
private set { SetValue(IsFullyInViewportProperty, value); }
}
/// <summary>
/// Gets a value indicating whether associated element is in the ScrollViewer viewport
/// </summary>
public bool IsInViewport
{
get { return (bool)GetValue(IsInViewportProperty); }
private set { SetValue(IsInViewportProperty, value); }
}
/// <summary>
/// Called after the behavior is attached to the <see cref="P:Microsoft.Xaml.Interactivity.Behavior.AssociatedObject" />.
/// </summary>
@ -120,39 +75,6 @@ namespace Microsoft.Toolkit.Uwp.UI.Behaviors
_hostScrollViewer = null;
}
private static void OnIsFullyInViewportChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var obj = (ViewportBehavior)d;
var value = (bool)e.NewValue;
if (value)
{
obj.EnteredViewport?.Invoke(obj.AssociatedObject, EventArgs.Empty);
if (!obj.IsAlwaysOn)
{
Interaction.GetBehaviors(obj.AssociatedObject).Remove(obj);
}
}
else
{
obj.ExitingViewport?.Invoke(obj.AssociatedObject, EventArgs.Empty);
}
}
private static void OnIsInViewportChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var obj = (ViewportBehavior)d;
var value = (bool)e.NewValue;
if (value)
{
obj.EnteringViewport?.Invoke(obj.AssociatedObject, EventArgs.Empty);
}
else
{
obj.ExitedViewport?.Invoke(obj.AssociatedObject, EventArgs.Empty);
}
}
private void ParentScrollViewer_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)
{
var associatedElementRect = AssociatedObject.TransformToVisual(_hostScrollViewer)