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public class DockPanelSplitter : Thumb |
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{ |
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private Control _element; |
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/// <summary> |
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/// Defines the <see cref="Thickness"/> property. |
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/// </summary> |
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public static readonly StyledProperty<double> ThicknessProperty = |
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AvaloniaProperty.Register<DockPanel, double>(nameof(Thickness), 4.0); |
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/// <summary> |
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/// Gets or sets the thickness (height or width, depending on orientation). |
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/// </summary> |
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/// <value>The thickness.</value> |
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public double Thickness |
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{ |
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get { return GetValue(ThicknessProperty); } |
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set { SetValue(ThicknessProperty, value); } |
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} |
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/// <summary> |
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/// Initializes a new instance of the <see cref="DockPanelSplitter" /> class. |
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/// </summary> |
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public DockPanelSplitter() |
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{ |
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} |
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/// <summary> |
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/// Gets a value indicating whether this splitter is horizontal. |
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/// </summary> |
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public bool IsHorizontal |
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{ |
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get |
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{ |
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var dock = GetDock(this); |
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return dock == Dock.Top || dock == Dock.Bottom; |
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} |
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} |
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protected override void OnDragDelta(VectorEventArgs e) |
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{ |
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var dock = GetDock(this); |
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if (IsHorizontal) |
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{ |
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AdjustHeight(e.Vector.Y, dock); |
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} |
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else |
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{ |
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AdjustWidth(e.Vector.X, dock); |
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} |
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} |
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protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e) |
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{ |
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base.OnAttachedToVisualTree(e); |
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UpdateHeightOrWidth(); |
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UpdateTargetElement(); |
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} |
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private void AdjustHeight(double dy, Dock dock) |
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{ |
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if (dock == Dock.Bottom) |
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{ |
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dy = -dy; |
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} |
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SetTargetHeight(dy); |
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} |
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private void AdjustWidth(double dx, Dock dock) |
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{ |
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if (dock == Dock.Right) |
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{ |
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dx = -dx; |
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} |
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SetTargetWidth(dx); |
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} |
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private void SetTargetHeight(double dy) |
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{ |
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double height = _element.DesiredSize.Height + dy; |
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if (height < _element.MinHeight) |
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{ |
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height = _element.MinHeight; |
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} |
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if (height > _element.MaxHeight) |
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{ |
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height = _element.MaxHeight; |
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} |
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var panel = GetPanel(); |
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var dock = GetDock(this); |
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if (dock == Dock.Top && height > panel.DesiredSize.Height - Thickness) |
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{ |
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height = panel.DesiredSize.Height - Thickness; |
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} |
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_element.Height = height; |
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} |
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private void SetTargetWidth(double dx) |
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{ |
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double width = _element.DesiredSize.Width + dx; |
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if (width < _element.MinWidth) |
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{ |
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width = _element.MinWidth; |
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} |
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if (width > _element.MaxWidth) |
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{ |
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width = _element.MaxWidth; |
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} |
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var panel = GetPanel(); |
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var dock = GetDock(this); |
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if (dock == Dock.Left && width > panel.DesiredSize.Width - Thickness) |
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{ |
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width = panel.DesiredSize.Width - Thickness; |
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} |
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_element.Width = width; |
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} |
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private void UpdateHeightOrWidth() |
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{ |
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if (IsHorizontal) |
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{ |
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Height = Thickness; |
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Width = double.NaN; |
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Cursor = new Cursor(StandardCursorType.SizeNorthSouth); |
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PseudoClasses.Add(":horizontal"); |
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} |
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else |
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{ |
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Width = Thickness; |
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Height = double.NaN; |
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Cursor = new Cursor(StandardCursorType.SizeWestEast); |
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PseudoClasses.Add(":vertical"); |
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} |
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} |
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private Dock GetDock(Control control) |
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{ |
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if (this.Parent is ContentPresenter presenter) |
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{ |
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return DockPanel.GetDock(presenter); |
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} |
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return DockPanel.GetDock(control); |
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} |
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private Panel GetPanel() |
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{ |
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if (this.Parent is ContentPresenter presenter) |
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{ |
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if (presenter.GetVisualParent() is Panel panel) |
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{ |
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return panel; |
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} |
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} |
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else |
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{ |
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if (this.Parent is Panel panel) |
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{ |
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return panel; |
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} |
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} |
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return null; |
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} |
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private void UpdateTargetElement() |
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{ |
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if (this.Parent is ContentPresenter presenter) |
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{ |
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if (!(presenter.GetVisualParent() is Panel panel)) |
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{ |
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return; |
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} |
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int index = panel.Children.IndexOf(this.Parent); |
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if (index > 0 && panel.Children.Count > 0) |
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{ |
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_element = (panel.Children[index - 1] as ContentPresenter).Child as Control; |
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} |
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} |
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else |
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{ |
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if (!(this.Parent is Panel panel)) |
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{ |
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return; |
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} |
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int index = panel.Children.IndexOf(this); |
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if (index > 0 && panel.Children.Count > 0) |
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{ |
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_element = panel.Children[index - 1] as Control; |
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} |
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} |
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} |
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} |
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