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using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
namespace MaterialDesignThemes.Wpf.Transitions
{
public class TransitioningContentBase : ContentControl, ITransitionEffectSubject
{
public const string MatrixTransformPartName = "PART_MatrixTransform";
public const string RotateTransformPartName = "PART_RotateTransform";
public const string ScaleTransformPartName = "PART_ScaleTransform";
public const string SkewTransformPartName = "PART_SkewTransform";
public const string TranslateTransformPartName = "PART_TranslateTransform";
private MatrixTransform _matrixTransform;
private RotateTransform _rotateTransform;
private ScaleTransform _scaleTransform;
private SkewTransform _skewTransform;
private TranslateTransform _translateTransform;
private bool _isOpeningEffectPending = false;
static TransitioningContentBase()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof (TransitioningContentBase), new FrameworkPropertyMetadata(typeof (TransitioningContentBase)));
}
public TransitioningContentBase()
{
NameScope.SetNameScope(this, new NameScope());
}
public override void OnApplyTemplate()
{
_matrixTransform = GetTemplateChild(MatrixTransformPartName) as MatrixTransform;
_rotateTransform = GetTemplateChild(RotateTransformPartName) as RotateTransform;
_scaleTransform = GetTemplateChild(ScaleTransformPartName) as ScaleTransform;
_skewTransform = GetTemplateChild(SkewTransformPartName) as SkewTransform;
_translateTransform = GetTemplateChild(TranslateTransformPartName) as TranslateTransform;
UnregisterNames(MatrixTransformPartName, RotateTransformPartName, ScaleTransformPartName, SkewTransformPartName, TranslateTransformPartName);
if (_matrixTransform != null)
RegisterName(MatrixTransformPartName, _matrixTransform);
if (_rotateTransform != null)
RegisterName(RotateTransformPartName, _rotateTransform);
if (_scaleTransform != null)
RegisterName(ScaleTransformPartName, _scaleTransform);
if (_skewTransform != null)
RegisterName(SkewTransformPartName, _skewTransform);
if (_translateTransform != null)
RegisterName(TranslateTransformPartName, _translateTransform);
base.OnApplyTemplate();
RunOpeningEffects();
}
private void UnregisterNames(params string[] names)
{
foreach (var name in names.Where(n => FindName(n) != null))
{
UnregisterName(name);
}
}
public static readonly DependencyProperty OpeningEffectProperty = DependencyProperty.Register("OpeningEffect", typeof (TransitionEffectBase), typeof (TransitioningContentBase), new PropertyMetadata(default(TransitionEffectBase)));
/// <summary>
/// Gets or sets the transition to run when the content is loaded and made visible.
/// </summary>
[TypeConverter(typeof(TransitionEffectTypeConverter))]
public TransitionEffectBase OpeningEffect
{
get { return (TransitionEffectBase) GetValue(OpeningEffectProperty); }
set { SetValue(OpeningEffectProperty, value); }
}
public static readonly DependencyProperty OpeningEffectsOffsetProperty = DependencyProperty.Register(
"OpeningEffectsOffset", typeof (TimeSpan), typeof (TransitioningContentBase), new PropertyMetadata(default(TimeSpan)));
/// <summary>
/// Delay offset to be applied to all opening effect transitions.
/// </summary>
public TimeSpan OpeningEffectsOffset
{
get { return (TimeSpan) GetValue(OpeningEffectsOffsetProperty); }
set { SetValue(OpeningEffectsOffsetProperty, value); }
}
/// <summary>
/// Allows multiple transition effects to be combined and run upon the content loading or being made visible.
/// </summary>
public ObservableCollection<TransitionEffectBase> OpeningEffects { get; } = new ObservableCollection<TransitionEffectBase>();
string ITransitionEffectSubject.MatrixTransformName => MatrixTransformPartName;
string ITransitionEffectSubject.RotateTransformName => RotateTransformPartName;
string ITransitionEffectSubject.ScaleTransformName => ScaleTransformPartName;
string ITransitionEffectSubject.SkewTransformName => SkewTransformPartName;
string ITransitionEffectSubject.TranslateTransformName => TranslateTransformPartName;
TimeSpan ITransitionEffectSubject.Offset => OpeningEffectsOffset;
protected virtual void RunOpeningEffects()
{
if (!IsLoaded || _matrixTransform == null)
{
_isOpeningEffectPending = true;
return;
}
_isOpeningEffectPending = false;
var storyboard = new Storyboard();
var openingEffect = OpeningEffect?.Build(this);
if (openingEffect != null)
storyboard.Children.Add(openingEffect);
foreach (var effect in OpeningEffects.Select(e => e.Build(this)).Where(tl => tl != null))
{
storyboard.Children.Add(effect);
}
storyboard.Begin(this);
}
}
}
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