/AvalonEdit/ICSharpCode.AvalonEdit/Editing/CaretLayer.cs
http://github.com/icsharpcode/ILSpy · C# · 115 lines · 82 code · 15 blank · 18 comment · 9 complexity · f3f1bc4d754c626d9dc1eb09da657dba MD5 · raw file
- // Copyright (c) 2014 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;
- using System.Windows;
- using System.Windows.Controls;
- using System.Windows.Media;
- using System.Windows.Media.Animation;
- using System.Windows.Threading;
- using ICSharpCode.AvalonEdit.Rendering;
- using ICSharpCode.AvalonEdit.Utils;
- namespace ICSharpCode.AvalonEdit.Editing
- {
- sealed class CaretLayer : Layer
- {
- TextArea textArea;
-
- bool isVisible;
- Rect caretRectangle;
-
- DispatcherTimer caretBlinkTimer = new DispatcherTimer();
- bool blink;
-
- public CaretLayer(TextArea textArea) : base(textArea.TextView, KnownLayer.Caret)
- {
- this.textArea = textArea;
- this.IsHitTestVisible = false;
- caretBlinkTimer.Tick += new EventHandler(caretBlinkTimer_Tick);
- }
- void caretBlinkTimer_Tick(object sender, EventArgs e)
- {
- blink = !blink;
- InvalidateVisual();
- }
-
- public void Show(Rect caretRectangle)
- {
- this.caretRectangle = caretRectangle;
- this.isVisible = true;
- StartBlinkAnimation();
- InvalidateVisual();
- }
-
- public void Hide()
- {
- if (isVisible) {
- isVisible = false;
- StopBlinkAnimation();
- InvalidateVisual();
- }
- }
-
- void StartBlinkAnimation()
- {
- TimeSpan blinkTime = Win32.CaretBlinkTime;
- blink = true; // the caret should visible initially
- // This is important if blinking is disabled (system reports a negative blinkTime)
- if (blinkTime.TotalMilliseconds > 0) {
- caretBlinkTimer.Interval = blinkTime;
- caretBlinkTimer.Start();
- }
- }
-
- void StopBlinkAnimation()
- {
- caretBlinkTimer.Stop();
- }
-
- internal Brush CaretBrush;
-
- protected override void OnRender(DrawingContext drawingContext)
- {
- base.OnRender(drawingContext);
- if (isVisible && blink) {
- Brush caretBrush = this.CaretBrush;
- if (caretBrush == null)
- caretBrush = (Brush)textView.GetValue(TextBlock.ForegroundProperty);
-
- if (this.textArea.OverstrikeMode) {
- SolidColorBrush scBrush = caretBrush as SolidColorBrush;
- if (scBrush != null) {
- Color brushColor = scBrush.Color;
- Color newColor = Color.FromArgb(100, brushColor.R, brushColor.G, brushColor.B);
- caretBrush = new SolidColorBrush(newColor);
- caretBrush.Freeze();
- }
- }
-
- Rect r = new Rect(caretRectangle.X - textView.HorizontalOffset,
- caretRectangle.Y - textView.VerticalOffset,
- caretRectangle.Width,
- caretRectangle.Height);
- drawingContext.DrawRectangle(caretBrush, null, PixelSnapHelpers.Round(r, PixelSnapHelpers.GetPixelSize(this)));
- }
- }
- }
- }