112 lines
3.7 KiB
C#
112 lines
3.7 KiB
C#
// Copyright (c) 2014 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;
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using Unity.CodeEditor.Rendering;
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using Unity.CodeEditor.Utils;
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using UnityEngine;
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using UnityEngine.UIElements;
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namespace Unity.CodeEditor.Editing
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{
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internal sealed class CaretLayer : Layer
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{
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private readonly TextArea _textArea;
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private readonly VisualElement _caretElement;
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private bool _isVisible;
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private Rect _caretRectangle;
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private IVisualElementScheduledItem _blinkSchedule;
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private bool _blink;
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internal CaretLayer(TextArea textArea) : base(textArea.TextView, KnownLayer.Caret)
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{
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_textArea = textArea;
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_caretElement = new VisualElement();
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_caretElement.pickingMode = PickingMode.Ignore;
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_caretElement.style.position = Position.Absolute;
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_caretElement.visible = false;
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Add(_caretElement);
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}
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private void UpdateCaretVisual()
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{
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if (!_isVisible || !_blink)
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{
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_caretElement.visible = false;
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return;
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}
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var caretBrush = CaretBrush ?? TextView.ForegroundColor;
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var 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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r = PixelSnapHelpers.Round(r, PixelSnapHelpers.GetPixelSize(this));
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_caretElement.style.left = r.x;
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_caretElement.style.top = r.y;
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_caretElement.style.width = r.width;
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_caretElement.style.height = r.height;
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_caretElement.style.backgroundColor = caretBrush;
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_caretElement.visible = true;
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}
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internal void Show(Rect caretRectangle)
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{
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_caretRectangle = caretRectangle;
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_isVisible = true;
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StartBlinkAnimation();
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UpdateCaretVisual();
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}
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internal void Hide()
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{
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if (_isVisible)
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{
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_isVisible = false;
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StopBlinkAnimation();
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UpdateCaretVisual();
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}
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}
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private void StartBlinkAnimation()
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{
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_blink = true;
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StopBlinkAnimation();
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_blinkSchedule = schedule.Execute(() =>
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{
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_blink = !_blink;
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UpdateCaretVisual();
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}).StartingIn(500).Every(500);
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}
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private void StopBlinkAnimation()
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{
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_blinkSchedule?.Pause();
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_blinkSchedule = null;
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}
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internal Color? CaretBrush;
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}
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}
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