TheXamlGuy
412 lines
12 KiB
C#
412 lines
12 KiB
C#
using Avalonia.Controls.Primitives;
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using Avalonia.Controls;
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using Avalonia.Input;
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using Avalonia.Interactivity;
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using Avalonia;
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using Avalonia.Controls.Shapes;
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namespace Toolkit.UI.Controls.Avalonia;
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public class ContentCropper : ContentControl
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{
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public static readonly StyledProperty<Rect> CropRectangleProperty =
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AvaloniaProperty.Register<ContentCropper, Rect>(nameof(CropRectangle));
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public static readonly StyledProperty<bool> IsRatioScaleProperty =
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AvaloniaProperty.Register<ContentCropper, bool>(nameof(IsRatioScale));
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public static readonly StyledProperty<double> RectScaleProperty =
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AvaloniaProperty.Register<ContentCropper, double>(nameof(RectScale), 0.5);
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public static readonly StyledProperty<Size> ScaleSizeProperty =
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AvaloniaProperty.Register<ContentCropper, Size>(nameof(ScaleSize), new Size(2, 1));
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private Border? border;
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private Thumb? bottomLeftButton;
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private Thumb? bottomRightButton;
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private Canvas? canvas;
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private double cropHeightRatio;
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private double cropLeftRatio;
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private double cropTopRatio;
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private double cropWidthRatio;
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private bool isDragging;
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private double offsetX;
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private double offsetY;
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private Rectangle? rectangleBottom;
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private Rectangle? rectangleLeft;
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private Rectangle? rectangleRight;
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private Rectangle? rectangleTop;
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private Thumb? topLeftButton;
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private Thumb? topRightButton;
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static ContentCropper()
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{
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AffectsRender<ContentCropper>(RectScaleProperty, ContentProperty);
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}
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public Rect CropRectangle
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{
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get => GetValue(CropRectangleProperty);
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private set => SetValue(CropRectangleProperty, value);
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}
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public bool IsRatioScale
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{
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get => GetValue(IsRatioScaleProperty);
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set => SetValue(IsRatioScaleProperty, value);
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}
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public double RectScale
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{
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get => GetValue(RectScaleProperty);
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set => SetValue(RectScaleProperty, value);
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}
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public Size ScaleSize
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{
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get => GetValue(ScaleSizeProperty);
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set => SetValue(ScaleSizeProperty, value);
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}
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protected override void OnApplyTemplate(TemplateAppliedEventArgs args)
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{
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base.OnApplyTemplate(args);
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canvas = args.NameScope.Find<Canvas>("Canvas");
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rectangleLeft = args.NameScope.Find<Rectangle>("RectangleLeft");
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rectangleTop = args.NameScope.Find<Rectangle>("RectangleTop");
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rectangleRight = args.NameScope.Find<Rectangle>("RectangleRight");
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rectangleBottom = args.NameScope.Find<Rectangle>("RectangleBottom");
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border = args.NameScope.Find<Border>("Border");
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topLeftButton = args.NameScope.Find<Thumb>("TopLeftButton");
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if (topLeftButton is not null)
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{
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topLeftButton.DragDelta += OnThumbDragDelta;
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}
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topRightButton = args.NameScope.Find<Thumb>("TopRightButton");
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if (topRightButton is not null)
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{
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topRightButton.DragDelta += OnThumbDragDelta;
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}
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bottomLeftButton = args.NameScope.Find<Thumb>("BottomLeftButton");
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if (bottomLeftButton is not null)
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{
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bottomLeftButton.DragDelta += OnThumbDragDelta;
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}
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bottomRightButton = args.NameScope.Find<Thumb>("BottomRightButton");
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if (bottomRightButton is not null)
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{
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bottomRightButton.DragDelta += OnThumbDragDelta;
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}
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}
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protected override void OnLoaded(RoutedEventArgs args)
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{
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base.OnLoaded(args);
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InitializeCropRect();
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}
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protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
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{
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base.OnPropertyChanged(change);
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if (change.Property == IsRatioScaleProperty ||
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change.Property == RectScaleProperty ||
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change.Property == ContentProperty)
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{
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InitializeCropRect();
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}
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}
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protected override void OnSizeChanged(SizeChangedEventArgs args)
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{
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base.OnSizeChanged(args);
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if (canvas is null || border is null)
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{
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return;
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}
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double newContentWidth = Bounds.Width;
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double newContentHeight = Bounds.Height;
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canvas.Width = newContentWidth;
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canvas.Height = newContentHeight;
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if (border.Width > 0 && border.Height > 0)
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{
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double newCropLeft = cropLeftRatio * newContentWidth;
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double newCropTop = cropTopRatio * newContentHeight;
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double newCropWidth = cropWidthRatio * newContentWidth;
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double newCropHeight = cropHeightRatio * newContentHeight;
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border.Width = newCropWidth;
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border.Height = newCropHeight;
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Canvas.SetLeft(border, newCropLeft);
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Canvas.SetTop(border, newCropTop);
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}
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else
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{
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InitializeCropRect();
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}
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PositionThumbs();
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RenderOverLays();
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}
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private void InitializeCropRect()
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{
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if (canvas is null || Content is not Control content)
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{
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return;
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}
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double maxWidth = Bounds.Width;
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double maxHeight = Bounds.Height;
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double contentWidth = content.Bounds.Width > 0 ? content.Bounds.Width : maxWidth * 0.5;
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double contentHeight = content.Bounds.Height > 0 ? content.Bounds.Height : maxHeight * 0.5;
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double scaleFactor = Math.Min(maxWidth / contentWidth, maxHeight / contentHeight);
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double width = contentWidth * scaleFactor;
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double height = contentHeight * scaleFactor;
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canvas.Width = width;
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canvas.Height = height;
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UpdateCropArea(width, height);
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UpdateCropRatios();
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PositionThumbs();
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RenderOverLays();
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}
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private void OnBorderPointerMoved(object? sender, PointerEventArgs args)
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{
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if (!isDragging || canvas is null || border is null)
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{
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return;
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}
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Point position = args.GetPosition(this);
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double newX = Math.Clamp(position.X - offsetX, 0, canvas.Bounds.Width - border.Bounds.Width);
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double newY = Math.Clamp(position.Y - offsetY, 0, canvas.Bounds.Height - border.Bounds.Height);
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Canvas.SetLeft(border, newX);
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Canvas.SetTop(border, newY);
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PositionThumbs();
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RenderOverLays();
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}
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private void OnBorderPointerPressed(object? sender,
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PointerPressedEventArgs args)
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{
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if (!isDragging && border is not null)
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{
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isDragging = true;
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Point position = args.GetPosition(this);
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offsetX = position.X - Canvas.GetLeft(border);
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offsetY = position.Y - Canvas.GetTop(border);
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}
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}
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private void OnBorderPointerReleased(object? sender,
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PointerReleasedEventArgs args)
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{
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isDragging = false;
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UpdateCropRatios();
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}
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private void OnThumbDragDelta(object? sender,
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VectorEventArgs args)
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{
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if (canvas is null || border is null || sender is not Thumb thumb)
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{
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return;
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}
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double deltaX = args.Vector.X;
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double deltaY = args.Vector.Y;
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double leftPosition = Canvas.GetLeft(border);
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double topPosition = Canvas.GetTop(border);
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double newWidth = border.Width;
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double newHeight = border.Height;
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switch (thumb.Name)
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{
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case "TopLeftButton":
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newWidth = Math.Max(0, border.Width - deltaX);
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newHeight = Math.Max(0, border.Height - deltaY);
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if (newWidth > 0) leftPosition += deltaX;
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if (newHeight > 0) topPosition += deltaY;
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break;
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case "TopRightButton":
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newWidth = Math.Max(0, border.Width + deltaX);
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newHeight = Math.Max(0, border.Height - deltaY);
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if (newHeight > 0) topPosition += deltaY;
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break;
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case "BottomLeftButton":
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newWidth = Math.Max(0, border.Width - deltaX);
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newHeight = Math.Max(0, border.Height + deltaY);
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if (newWidth > 0) leftPosition += deltaX;
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break;
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case "BottomRightButton":
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newWidth = Math.Max(0, border.Width + deltaX);
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newHeight = Math.Max(0, border.Height + deltaY);
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break;
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}
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border.Width = newWidth;
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border.Height = newHeight;
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Canvas.SetLeft(border, leftPosition);
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Canvas.SetTop(border, topPosition);
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UpdateCropRatios();
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PositionThumbs();
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RenderOverLays();
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}
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private void PositionThumbs()
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{
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if (border == null ||
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canvas == null)
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{
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return;
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}
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double borderLeft = Canvas.GetLeft(border);
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double borderTop = Canvas.GetTop(border);
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double borderWidth = border.Width;
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double borderHeight = border.Height;
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if (topLeftButton is not null)
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{
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Canvas.SetLeft(topLeftButton, borderLeft - (topLeftButton.Width / 2));
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Canvas.SetTop(topLeftButton, borderTop - (topLeftButton.Height / 2));
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}
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if (topRightButton is not null)
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{
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Canvas.SetLeft(topRightButton, borderLeft + borderWidth - (topRightButton.Width / 2));
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Canvas.SetTop(topRightButton, borderTop - (topRightButton.Height / 2));
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}
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if (bottomLeftButton is not null)
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{
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Canvas.SetLeft(bottomLeftButton, borderLeft - (bottomLeftButton.Width / 2));
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Canvas.SetTop(bottomLeftButton, borderTop + borderHeight - (bottomLeftButton.Height / 2));
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}
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if (bottomRightButton is not null)
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{
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Canvas.SetLeft(bottomRightButton, borderLeft + borderWidth - (bottomRightButton.Width / 2));
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Canvas.SetTop(bottomRightButton, borderTop + borderHeight - (bottomRightButton.Height / 2));
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}
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}
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private void RenderOverLays()
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{
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if (canvas == null ||
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border == null ||
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rectangleLeft == null ||
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rectangleTop == null ||
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rectangleRight == null ||
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rectangleBottom == null)
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{
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return;
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}
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double borderTop = Canvas.GetTop(border);
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double borderLeft = Canvas.GetLeft(border);
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rectangleLeft.Width = Math.Max(0, borderLeft);
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rectangleLeft.Height = Math.Max(0, border.Height);
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Canvas.SetTop(rectangleLeft, borderTop);
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rectangleTop.Width = Math.Max(0, canvas.Width);
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rectangleTop.Height = Math.Max(0, borderTop - 0.5);
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double rightX = borderLeft + border.Width;
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rectangleRight.Width = Math.Max(0, canvas.Width - rightX);
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rectangleRight.Height = Math.Max(0, border.Height);
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Canvas.SetLeft(rectangleRight, rightX);
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Canvas.SetTop(rectangleRight, borderTop);
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double bottomY = borderTop + border.Height;
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rectangleBottom.Width = Math.Max(0, canvas.Width);
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rectangleBottom.Height = Math.Max(0, canvas.Height - bottomY);
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Canvas.SetTop(rectangleBottom, bottomY);
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}
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private void UpdateCropRatios()
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{
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if (canvas == null || border == null)
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{
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return;
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}
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cropLeftRatio = Canvas.GetLeft(border) / canvas.Width;
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cropTopRatio = Canvas.GetTop(border) / canvas.Height;
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cropWidthRatio = border.Width / canvas.Width;
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cropHeightRatio = border.Height / canvas.Height;
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}
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private void UpdateCropArea(double width, double height)
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{
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if (canvas == null || border == null)
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{
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return;
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}
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if (IsRatioScale && ScaleSize.Width > 0 && ScaleSize.Height > 0)
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{
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if (ScaleSize.Width > ScaleSize.Height)
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{
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border.Width = width * RectScale;
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border.Height = border.Width / ScaleSize.Width;
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}
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else
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{
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border.Height = height * RectScale;
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border.Width = border.Height * ScaleSize.Height;
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}
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}
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else
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{
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border.Width = width * RectScale;
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border.Height = height * RectScale;
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}
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double centreX = (canvas.Width - border.Width) / 2;
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double centreY = (canvas.Height - border.Height) / 2;
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Canvas.SetLeft(border, centreX);
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Canvas.SetTop(border, centreY);
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PositionThumbs();
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border.PointerPressed -= OnBorderPointerPressed;
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border.PointerPressed += OnBorderPointerPressed;
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border.PointerMoved -= OnBorderPointerMoved;
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border.PointerMoved += OnBorderPointerMoved;
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border.PointerReleased -= OnBorderPointerReleased;
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border.PointerReleased += OnBorderPointerReleased;
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}
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}
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