94 lines
3.7 KiB
C#
94 lines
3.7 KiB
C#
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// 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.Collections.Generic;
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using Unity.CodeEditor.Rendering;
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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 SelectionLayer : Layer
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{
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private static readonly Color SelectionColor = TextEditorColors.Selection;
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private readonly TextArea _textArea;
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private readonly List<VisualElement> _selectionElements = new List<VisualElement>();
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internal SelectionLayer(TextArea textArea) : base(textArea.TextView, KnownLayer.Selection)
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{
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_textArea = textArea;
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TextView.VisualLinesChanged += (s, e) => InvalidateSelection();
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TextView.ScrollOffsetChanged += (s, e) => InvalidateSelection();
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}
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internal void InvalidateSelection()
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{
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UpdateSelectionVisuals();
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}
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private void UpdateSelectionVisuals()
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{
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if (_textArea.Selection is EmptySelection)
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{
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for (int i = 0; i < _selectionElements.Count; i++)
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_selectionElements[i].visible = false;
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return;
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}
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int needed = 0;
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foreach (var segment in _textArea.Selection.Segments)
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{
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foreach (var rect in BackgroundGeometryBuilder.GetRectsForSegment(
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TextView, segment, _textArea.Selection.EnableVirtualSpace))
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{
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needed++;
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}
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}
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while (_selectionElements.Count < needed)
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{
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var el = new VisualElement();
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el.pickingMode = PickingMode.Ignore;
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el.style.position = Position.Absolute;
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el.style.backgroundColor = SelectionColor;
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_selectionElements.Add(el);
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Add(el);
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}
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int index = 0;
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foreach (var segment in _textArea.Selection.Segments)
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{
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foreach (var rect in BackgroundGeometryBuilder.GetRectsForSegment(
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TextView, segment, _textArea.Selection.EnableVirtualSpace))
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{
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var el = _selectionElements[index];
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el.style.left = rect.x;
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el.style.top = rect.y;
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el.style.width = rect.width;
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el.style.height = rect.height;
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el.visible = true;
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index++;
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}
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}
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for (int i = index; i < _selectionElements.Count; i++)
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_selectionElements[i].visible = false;
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}
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}
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}
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