OnlineMonitorSystem/HandyControl/HandyControl_Shared/Controls/Block/FloatingBlock.cs

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using HandyControl.Data;
using HandyControl.Interactivity;
using HandyControl.Tools;

namespace HandyControl.Controls;

public class FloatingBlock : Control
{
    public static readonly DependencyProperty ToXProperty = DependencyProperty.RegisterAttached(
        "ToX", typeof(double), typeof(FloatingBlock), new PropertyMetadata(ValueBoxes.Double0Box));

    public static void SetToX(DependencyObject element, double value)
        => element.SetValue(ToXProperty, value);

    public static double GetToX(DependencyObject element)
        => (double) element.GetValue(ToXProperty);

    public static readonly DependencyProperty ToYProperty = DependencyProperty.RegisterAttached(
        "ToY", typeof(double), typeof(FloatingBlock), new PropertyMetadata(-100.0));

    public static void SetToY(DependencyObject element, double value)
        => element.SetValue(ToYProperty, value);

    public static double GetToY(DependencyObject element)
        => (double) element.GetValue(ToYProperty);

    public static readonly DependencyProperty DurationProperty = DependencyProperty.RegisterAttached(
        "Duration", typeof(Duration), typeof(FloatingBlock), new PropertyMetadata(new Duration(TimeSpan.FromSeconds(2))));

    public static void SetDuration(DependencyObject element, Duration value)
        => element.SetValue(DurationProperty, value);

    public static Duration GetDuration(DependencyObject element)
        => (Duration) element.GetValue(DurationProperty);

    public static readonly DependencyProperty HorizontalOffsetProperty = DependencyProperty.RegisterAttached(
        "HorizontalOffset", typeof(double), typeof(FloatingBlock), new PropertyMetadata(ValueBoxes.Double0Box));

    public static void SetHorizontalOffset(DependencyObject element, double value)
        => element.SetValue(HorizontalOffsetProperty, value);

    public static double GetHorizontalOffset(DependencyObject element)
        => (double) element.GetValue(HorizontalOffsetProperty);

    public static readonly DependencyProperty VerticalOffsetProperty = DependencyProperty.RegisterAttached(
        "VerticalOffset", typeof(double), typeof(FloatingBlock), new PropertyMetadata(ValueBoxes.Double0Box));

    public static void SetVerticalOffset(DependencyObject element, double value)
        => element.SetValue(VerticalOffsetProperty, value);

    public static double GetVerticalOffset(DependencyObject element)
        => (double) element.GetValue(VerticalOffsetProperty);

    public static readonly DependencyProperty ContentTemplateProperty = DependencyProperty.RegisterAttached(
        "ContentTemplate", typeof(DataTemplate), typeof(FloatingBlock), new PropertyMetadata(default(DataTemplate), OnDataChanged));

    public static void SetContentTemplate(DependencyObject element, DataTemplate value)
        => element.SetValue(ContentTemplateProperty, value);

    public static DataTemplate GetContentTemplate(DependencyObject element)
        => (DataTemplate) element.GetValue(ContentTemplateProperty);

    public DataTemplate ContentTemplate
    {
        get => (DataTemplate) GetValue(ContentTemplateProperty);
        set => SetValue(ContentTemplateProperty, value);
    }

    private static readonly DependencyProperty ReadyToFloatProperty = DependencyProperty.RegisterAttached(
        "ReadyToFloat", typeof(bool), typeof(FloatingBlock), new PropertyMetadata(ValueBoxes.FalseBox));

    private static void SetReadyToFloat(DependencyObject element, bool value)
        => element.SetValue(ReadyToFloatProperty, ValueBoxes.BooleanBox(value));

    private static bool GetReadyToFloat(DependencyObject element)
        => (bool) element.GetValue(ReadyToFloatProperty);

    public static readonly DependencyProperty ContentProperty = DependencyProperty.RegisterAttached(
        "Content", typeof(object), typeof(FloatingBlock), new PropertyMetadata(default, OnDataChanged));

    public static void SetContent(DependencyObject element, object value)
        => element.SetValue(ContentProperty, value);

    public static object GetContent(DependencyObject element)
        => element.GetValue(ContentProperty);

    public object Content
    {
        get => GetValue(ContentProperty);
        set => SetValue(ContentProperty, value);
    }

    private static void OnDataChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is not UIElement target) return;

        target.PreviewMouseLeftButtonDown -= Target_PreviewMouseLeftButtonDown;
        target.PreviewMouseLeftButtonUp -= Target_PreviewMouseLeftButtonUp;

        if (e.NewValue != null)
        {
            target.PreviewMouseLeftButtonDown += Target_PreviewMouseLeftButtonDown;
            target.PreviewMouseLeftButtonUp += Target_PreviewMouseLeftButtonUp;
        }
    }

    private static void Target_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) => SetReadyToFloat(sender as DependencyObject, true);

    private static void Target_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
    {
        if (sender is UIElement element && GetReadyToFloat(element))
        {
            var layer = AdornerLayer.GetAdornerLayer(element);
            if (layer != null)
            {
                var adorner = new AdornerContainer(layer)
                {
                    IsHitTestVisible = false
                };
                var child = CreateBlock(element, adorner);
                adorner.Child = child;

                layer.Add(adorner);
            }
            SetReadyToFloat(element, false);
        }
    }

    private static FloatingBlock CreateBlock(Visual element, AdornerContainer adorner)
    {
        var p = Mouse.GetPosition(adorner.AdornedElement);
        var transform = new TranslateTransform
        {
            X = p.X + GetHorizontalOffset(element),
            Y = p.Y + GetVerticalOffset(element)
        };

        var block = new FloatingBlock
        {
            Content = GetContent(element),
            ContentTemplate = GetContentTemplate(element),
            RenderTransform = new TransformGroup
            {
                Children =
                {
                    transform
                }
            }
        };

        var milliseconds = GetDuration(element).TimeSpan.TotalMilliseconds;

        var animationX = AnimationHelper.CreateAnimation(GetToX(element) + transform.X, milliseconds);
        Storyboard.SetTargetProperty(animationX, new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.X)"));
        Storyboard.SetTarget(animationX, block);

        var animationY = AnimationHelper.CreateAnimation(GetToY(element) + transform.Y, milliseconds);
        Storyboard.SetTargetProperty(animationY, new PropertyPath("(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.Y)"));
        Storyboard.SetTarget(animationY, block);

        var animationOpacity = AnimationHelper.CreateAnimation(0, milliseconds);
        Storyboard.SetTargetProperty(animationOpacity, new PropertyPath("Opacity"));
        Storyboard.SetTarget(animationOpacity, block);

        var storyboard = new Storyboard();
        storyboard.Completed += (s, e) =>
        {
            var layer = AdornerLayer.GetAdornerLayer(element);
            if (layer != null)
            {
                layer.Remove(adorner);
            }
            else if (adorner.Parent is AdornerLayer parent)
            {
                parent.Remove(adorner);
            }

            adorner.Child = null;
        };
        storyboard.Children.Add(animationX);
        storyboard.Children.Add(animationY);
        storyboard.Children.Add(animationOpacity);
        storyboard.Begin();

        return block;
    }
}