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@ -18,9 +18,6 @@ using Avalonia.Media.TextFormatting; |
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using Avalonia.Media.TextFormatting.Unicode; |
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using Avalonia.Automation.Peers; |
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using Avalonia.Threading; |
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using Avalonia.Platform; |
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using System.Reflection; |
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using static System.Net.Mime.MediaTypeNames; |
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namespace Avalonia.Controls |
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{ |
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@ -28,6 +25,7 @@ namespace Avalonia.Controls |
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/// Represents a control that can be used to display or edit unformatted text.
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/// </summary>
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[TemplatePart("PART_TextPresenter", typeof(TextPresenter))] |
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[TemplatePart("PART_ScrollViewer", typeof(ScrollViewer))] |
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[PseudoClasses(":empty")] |
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public class TextBox : TemplatedControl, UndoRedoHelper<TextBox.UndoRedoState>.IUndoRedoHost |
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{ |
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@ -158,7 +156,7 @@ namespace Avalonia.Controls |
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/// Defines see <see cref="TextPresenter.LineHeight"/> property.
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/// </summary>
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public static readonly StyledProperty<double> LineHeightProperty = |
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TextBlock.LineHeightProperty.AddOwner<TextBox>(); |
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TextBlock.LineHeightProperty.AddOwner<TextBox>(new(defaultValue: double.NaN)); |
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/// <summary>
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/// Defines see <see cref="TextBlock.LetterSpacing"/> property.
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@ -310,6 +308,7 @@ namespace Avalonia.Controls |
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} |
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private TextPresenter? _presenter; |
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private ScrollViewer? _scrollViewer; |
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private readonly TextBoxTextInputMethodClient _imClient = new(); |
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private readonly UndoRedoHelper<UndoRedoState> _undoRedoHelper; |
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private bool _isUndoingRedoing; |
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@ -490,7 +489,7 @@ namespace Avalonia.Controls |
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} |
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/// <summary>
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/// Gets or sets the maximum character length of the TextBox
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/// Gets or sets the maximum number of visible lines.
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/// </summary>
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public int MaxLength |
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{ |
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@ -803,6 +802,8 @@ namespace Avalonia.Controls |
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{ |
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_presenter = e.NameScope.Get<TextPresenter>("PART_TextPresenter"); |
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_scrollViewer = e.NameScope.Find<ScrollViewer>("PART_ScrollViewer"); |
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_imClient.SetPresenter(_presenter, this); |
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if (IsFocused) |
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@ -855,6 +856,10 @@ namespace Avalonia.Controls |
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{ |
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OnSelectionEndChanged(change); |
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} |
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else if (change.Property == MaxLinesProperty) |
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{ |
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InvalidateMeasure(); |
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} |
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else if (change.Property == UndoLimitProperty) |
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{ |
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OnUndoLimitChanged(change.GetNewValue<int>()); |
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@ -942,40 +947,10 @@ namespace Avalonia.Controls |
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{ |
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return; |
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} |
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_selectedTextChangesMadeSinceLastUndoSnapshot++; |
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SnapshotUndoRedo(ignoreChangeCount: false); |
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if (_presenter != null && MaxLines > 0) |
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{ |
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var lineCount = _presenter.TextLayout.TextLines.Count; |
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var length = 0; |
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var graphemeEnumerator = new GraphemeEnumerator(input.AsSpan()); |
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while (graphemeEnumerator.MoveNext(out var grapheme)) |
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{ |
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if (grapheme.FirstCodepoint.IsBreakChar) |
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{ |
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if (lineCount + 1 > MaxLines) |
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{ |
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break; |
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} |
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else |
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{ |
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lineCount++; |
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} |
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} |
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length += grapheme.Length; |
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} |
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if (length < input.Length) |
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{ |
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input = input.Remove(Math.Max(0, length)); |
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} |
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} |
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var currentText = Text ?? string.Empty; |
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var selectionLength = Math.Abs(SelectionStart - SelectionEnd); |
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var newLength = input.Length + currentText.Length - selectionLength; |
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@ -1518,7 +1493,7 @@ namespace Avalonia.Controls |
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_presenter.MoveCaretToPoint(point); |
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var caretIndex = _presenter.CaretIndex; |
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var selectionStart = SelectionStart; |
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var selectionEnd = SelectionEnd; |
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@ -1976,5 +1951,47 @@ namespace Avalonia.Controls |
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{ |
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CanRedo = _undoRedoHelper.CanRedo; |
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} |
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protected override Size MeasureOverride(Size availableSize) |
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{ |
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if(_scrollViewer != null) |
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{ |
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var maxHeight = double.PositiveInfinity; |
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if (MaxLines > 0 && double.IsNaN(Height)) |
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{ |
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var fontSize = FontSize; |
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var typeface = new Typeface(FontFamily, FontStyle, FontWeight, FontStretch); |
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var paragraphProperties = TextLayout.CreateTextParagraphProperties(typeface, fontSize, null, default, default, null, default, LineHeight, default); |
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var textLayout = new TextLayout(new MaxLinesTextSource(MaxLines), paragraphProperties); |
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maxHeight = Math.Ceiling(textLayout.Height); |
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} |
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_scrollViewer.SetCurrentValue(MaxHeightProperty, maxHeight); |
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} |
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return base.MeasureOverride(availableSize); |
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} |
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private class MaxLinesTextSource : ITextSource |
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{ |
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private readonly int _maxLines; |
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public MaxLinesTextSource(int maxLines) |
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{ |
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_maxLines = maxLines; |
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} |
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public TextRun? GetTextRun(int textSourceIndex) |
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{ |
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if (textSourceIndex >= _maxLines) |
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{ |
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return null; |
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} |
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return new TextEndOfLine(1); |
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} |
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} |
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} |
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} |
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Dan Walmsley
3 years ago