/SharpTreeView/LinesRenderer.cs
http://github.com/icsharpcode/ILSpy · C# · 75 lines · 47 code · 9 blank · 19 comment · 10 complexity · 8cbe09aff8b833ecc2d74be04fabea68 MD5 · raw file
- // Copyright (c) 2020 AlphaSierraPapa for the SharpDevelop Team
- //
- // Permission is hereby granted, free of charge, to any person obtaining a copy of this
- // software and associated documentation files (the "Software"), to deal in the Software
- // without restriction, including without limitation the rights to use, copy, modify, merge,
- // publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
- // to whom the Software is furnished to do so, subject to the following conditions:
- //
- // The above copyright notice and this permission notice shall be included in all copies or
- // substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
- // INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
- // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
- // FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- // DEALINGS IN THE SOFTWARE.
- using System.Windows;
- using System.Windows.Media;
- using System.Diagnostics;
- namespace ICSharpCode.TreeView
- {
- class LinesRenderer : FrameworkElement
- {
- static LinesRenderer()
- {
- pen = new Pen(Brushes.LightGray, 1);
- pen.Freeze();
- }
- static Pen pen;
- SharpTreeNodeView NodeView
- {
- get { return TemplatedParent as SharpTreeNodeView; }
- }
- protected override void OnRender(DrawingContext dc)
- {
- if (NodeView.Node == null) {
- // This seems to happen sometimes with DataContext==DisconnectedItem,
- // though I'm not sure why WPF would call OnRender() on a disconnected node
- Debug.WriteLine($"LinesRenderer.OnRender() called with DataContext={NodeView.DataContext}");
- return;
- }
- var indent = NodeView.CalculateIndent();
- var p = new Point(indent + 4.5, 0);
- if (!NodeView.Node.IsRoot || NodeView.ParentTreeView.ShowRootExpander) {
- dc.DrawLine(pen, new Point(p.X, ActualHeight / 2), new Point(p.X + 10, ActualHeight / 2));
- }
- if (NodeView.Node.IsRoot) return;
- if (NodeView.Node.IsLast) {
- dc.DrawLine(pen, p, new Point(p.X, ActualHeight / 2));
- }
- else {
- dc.DrawLine(pen, p, new Point(p.X, ActualHeight));
- }
- var current = NodeView.Node;
- while (true) {
- p.X -= 19;
- current = current.Parent;
- if (p.X < 0) break;
- if (!current.IsLast) {
- dc.DrawLine(pen, p, new Point(p.X, ActualHeight));
- }
- }
- }
- }
- }