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82 lines
2.5 KiB
82 lines
2.5 KiB
// Copyright (c) 2020 AlphaSierraPapa for the SharpDevelop Team
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System.Diagnostics;
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using System.Windows;
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using System.Windows.Media;
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namespace ICSharpCode.TreeView
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{
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class LinesRenderer : FrameworkElement
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{
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static LinesRenderer()
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{
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pen = new Pen(Brushes.LightGray, 1);
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pen.Freeze();
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}
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static Pen pen;
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SharpTreeNodeView NodeView {
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get { return TemplatedParent as SharpTreeNodeView; }
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}
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protected override void OnRender(DrawingContext dc)
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{
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if (NodeView.Node == null)
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{
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// This seems to happen sometimes with DataContext==DisconnectedItem,
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// though I'm not sure why WPF would call OnRender() on a disconnected node
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Debug.WriteLine($"LinesRenderer.OnRender() called with DataContext={NodeView.DataContext}");
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return;
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}
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var indent = NodeView.CalculateIndent();
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var p = new Point(indent + 4.5, 0);
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if (!NodeView.Node.IsRoot || NodeView.ParentTreeView.ShowRootExpander)
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{
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dc.DrawLine(pen, new Point(p.X, ActualHeight / 2), new Point(p.X + 10, ActualHeight / 2));
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}
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if (NodeView.Node.IsRoot)
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return;
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if (NodeView.Node.IsLast)
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{
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dc.DrawLine(pen, p, new Point(p.X, ActualHeight / 2));
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}
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else
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{
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dc.DrawLine(pen, p, new Point(p.X, ActualHeight));
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}
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var current = NodeView.Node;
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while (true)
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{
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p.X -= 19;
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current = current.Parent;
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if (p.X < 0)
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break;
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if (!current.IsLast)
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{
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dc.DrawLine(pen, p, new Point(p.X, ActualHeight));
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}
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}
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}
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}
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}
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