87 lines
2.2 KiB
C#
87 lines
2.2 KiB
C#
// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
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// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
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using System;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Media;
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using System.Windows.Media.Animation;
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using System.Windows.Threading;
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using ICSharpCode.AvalonEdit.Rendering;
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using ICSharpCode.AvalonEdit.Utils;
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namespace ICSharpCode.AvalonEdit.Editing
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{
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sealed class CaretLayer : Layer
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{
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bool isVisible;
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Rect caretRectangle;
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DispatcherTimer caretBlinkTimer = new DispatcherTimer();
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bool blink;
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public CaretLayer(TextView textView) : base(textView, KnownLayer.Caret)
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{
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this.IsHitTestVisible = false;
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caretBlinkTimer.Tick += new EventHandler(caretBlinkTimer_Tick);
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}
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void caretBlinkTimer_Tick(object sender, EventArgs e)
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{
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blink = !blink;
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InvalidateVisual();
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}
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public void Show(Rect caretRectangle)
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{
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this.caretRectangle = caretRectangle;
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this.isVisible = true;
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StartBlinkAnimation();
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InvalidateVisual();
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}
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public void Hide()
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{
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if (isVisible) {
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isVisible = false;
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StopBlinkAnimation();
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InvalidateVisual();
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}
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}
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void StartBlinkAnimation()
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{
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TimeSpan blinkTime = Win32.CaretBlinkTime;
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blink = true; // the caret should visible initially
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// This is important if blinking is disabled (system reports a negative blinkTime)
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if (blinkTime.TotalMilliseconds > 0) {
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caretBlinkTimer.Interval = blinkTime;
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caretBlinkTimer.Start();
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}
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}
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void StopBlinkAnimation()
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{
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caretBlinkTimer.Stop();
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}
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internal Brush CaretBrush;
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protected override void OnRender(DrawingContext drawingContext)
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{
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base.OnRender(drawingContext);
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if (isVisible && blink) {
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Brush caretBrush = this.CaretBrush;
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if (caretBrush == null)
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caretBrush = (Brush)textView.GetValue(TextBlock.ForegroundProperty);
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Rect r = new Rect(caretRectangle.X - textView.HorizontalOffset,
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caretRectangle.Y - textView.VerticalOffset,
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caretRectangle.Width,
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caretRectangle.Height);
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drawingContext.DrawRectangle(caretBrush, null, PixelSnapHelpers.Round(r, PixelSnapHelpers.GetPixelSize(this)));
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}
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}
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}
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}
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