237 lines
7.3 KiB
C#
237 lines
7.3 KiB
C#
using System;
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using System.Windows.Controls.Primitives;
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using System.Windows.Documents;
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using System.Windows.Media;
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using System.Windows;
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using System.Windows.Shapes;
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using Size = System.Windows.Size;
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using EGC = ExtendedGrid.Microsoft.Windows.Controls;
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namespace MECF.Framework.UI.Client.DataGridTransform.DataGrid.Microsoft.Windows.Controls.Primitives
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{
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public class DataGridCellDragToFillAdorner : Adorner
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{
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public event EventHandler<DragStartedEventArgs> OnDragStart;
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public event EventHandler<DragCompletedEventArgs> OnDragCompleted;
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public event EventHandler<DragDeltaEventArgs> OnDragDelta;
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private readonly VisualCollection _adornerVisuals;
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private readonly Thumb _thumb2;
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private readonly Rectangle _rec;
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private readonly Rectangle _recShadow;
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private Rect _lastBoundRect;
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private Brush _disabledStroke;
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#region Constructors
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public DataGridCellDragToFillAdorner(UIElement adornedElement, Size originCellSize) : base(adornedElement)
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{
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_lastBoundRect = new Rect(0, 0, originCellSize.Width, originCellSize.Height);
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_adornerVisuals = new VisualCollection(this);
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_disabledStroke = Brushes.DarkGray;
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_rec = new Rectangle()
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{
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StrokeThickness = 2
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};
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_recShadow = new Rectangle()
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{
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StrokeThickness = 2,
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StrokeDashArray = { 1, 1 },
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Opacity = 0.5,
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Visibility = Visibility.Hidden
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};
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_thumb2 = new Thumb();
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_thumb2.DragStarted += Thumb2OnDragStarted;
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_thumb2.DragDelta += Thumb2_DragDelta;
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_thumb2.DragCompleted += Thumb2OnDragCompleted;
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_adornerVisuals.Add(_rec);
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_adornerVisuals.Add(_recShadow);
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_adornerVisuals.Add(_thumb2);
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}
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#endregion
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#region Properties
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protected override int VisualChildrenCount => _adornerVisuals.Count;
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internal int StartCellIndex { get; private set; }
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internal int EndCellIndex { get; private set; }
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#endregion
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#region Dps
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public static readonly DependencyProperty ThumbStyleProperty = DependencyProperty.Register(
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nameof(ThumbStyle), typeof(Style), typeof(DataGridCellDragToFillAdorner),
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new PropertyMetadata(default(Style)));
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public Style ThumbStyle
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{
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get => (Style)GetValue(ThumbStyleProperty);
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set => SetValue(ThumbStyleProperty, value);
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}
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public static readonly DependencyProperty StrokeProperty = DependencyProperty.Register(
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nameof(Stroke), typeof(Brush), typeof(DataGridCellDragToFillAdorner),
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new PropertyMetadata(default(Brush)));
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public Brush Stroke
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{
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get => (Brush)GetValue(StrokeProperty);
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set => SetValue(StrokeProperty, value);
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}
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#endregion
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#region Methods
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protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
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{
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base.OnPropertyChanged(e);
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if(e.Property == IsEnabledProperty
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|| e.Property == ThumbStyleProperty
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|| e.Property == StrokeProperty)
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ApplyStyle();
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}
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protected override Visual GetVisualChild(int index)
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{
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return _adornerVisuals[index];
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}
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protected override Size ArrangeOverride(Size finalSize)
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{
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/*_rec.Arrange(_lastBoundRect);
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_thumb2.Arrange(new Rect(_lastBoundRect.Width - 5, _lastBoundRect.Height + _lastBoundRect.Y - 5, 10, 10));*/
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_rec.Arrange(new Rect(0, 0, finalSize.Width, finalSize.Height));
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//_recShadow.Arrange(new Rect(0, 0, finalSize.Width, finalSize.Height));
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_thumb2.Arrange(
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new Rect(finalSize.Width - _thumb2.Width / 2,
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finalSize.Height - _thumb2.Height / 2,
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_thumb2.Width,
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_thumb2.Height));
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return base.ArrangeOverride(finalSize);
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}
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private void ApplyStyle()
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{
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SetThumbStyle();
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SetStroke();
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if (IsEnabled == false)
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{
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_rec.Stroke = _disabledStroke;
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_recShadow.Stroke = _disabledStroke;
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_recShadow.Visibility = Visibility.Hidden;
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_thumb2.Background = _disabledStroke;
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}
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}
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private void SetThumbStyle()
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{
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if (ThumbStyle != null && ThumbStyle.TargetType == typeof(Thumb))
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_thumb2.Style = ThumbStyle;
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else
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{
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// Load default style
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LoadDefaultThumbStyle();
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}
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}
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private void SetStroke()
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{
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_rec.Stroke = Stroke;
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_recShadow.Stroke = Stroke;
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}
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private void LoadDefaultThumbStyle()
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{
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_thumb2.Width = 10;
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_thumb2.Height = 10;
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_thumb2.Background = Stroke;
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_thumb2.BorderThickness = new Thickness(0);
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}
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/// <summary>
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/// 绘制选择范围的虚线框。
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/// </summary>
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/// <param name="boundRect"></param>
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/// <param name="startCellIndex"></param>
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/// <param name="endCellIndex"></param>
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internal void ArrangeSelectionBound(Rect boundRect, int startCellIndex, int endCellIndex)
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{
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_lastBoundRect.X = boundRect.X;
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_lastBoundRect.Y = boundRect.Y;
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_lastBoundRect.Width = boundRect.Width;
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_lastBoundRect.Height = boundRect.Height;
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_recShadow.Arrange(_lastBoundRect);
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StartCellIndex = startCellIndex;
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EndCellIndex = endCellIndex;
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//Debug.WriteLine($"Adorner Bound: {_lastBoundRect}", "Adorner");
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}
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/// <summary>
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/// 获取拖动选择的范围。
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/// </summary>
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/// <returns></returns>
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internal Rect GetSelectionBound()
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{
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return _lastBoundRect;
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}
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/// <summary>
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/// 取消填充操作。
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/// </summary>
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internal void Cancel()
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{
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if (_thumb2.IsDragging)
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_thumb2.CancelDrag();
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}
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#endregion
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#region Event Handlers
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private void Thumb2OnDragStarted(object sender, DragStartedEventArgs e)
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{
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_recShadow.Visibility = Visibility.Visible;
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OnDragStart?.Invoke(this, e);
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}
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private void Thumb2OnDragCompleted(object sender, DragCompletedEventArgs e)
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{
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_recShadow.Visibility = Visibility.Hidden;
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if (!e.Canceled)
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{
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_rec.Arrange(_lastBoundRect);
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_recShadow.Arrange(_lastBoundRect);
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_thumb2.Arrange(
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new Rect(_lastBoundRect.Width - _thumb2.Width / 2,
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_lastBoundRect.Height + _lastBoundRect.Y - _thumb2.Height / 2,
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_thumb2.Width,
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_thumb2.Height));
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OnDragCompleted?.Invoke(this, e);
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}
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}
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private void Thumb2_DragDelta(object sender, DragDeltaEventArgs e)
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{
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OnDragDelta?.Invoke(this, e);
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}
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#endregion
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}
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}
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