269 lines
8.5 KiB
C#
269 lines
8.5 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.Collections.Generic;
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using System.Text;
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using System.Windows;
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using ICSharpCode.AvalonEdit.Document;
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using ICSharpCode.AvalonEdit.Highlighting;
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using ICSharpCode.AvalonEdit.Utils;
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namespace ICSharpCode.AvalonEdit.Editing
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{
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/// <summary>
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/// Base class for selections.
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/// </summary>
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public abstract class Selection
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{
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/// <summary>
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/// Creates a new simple selection that selects the text from startOffset to endOffset.
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/// </summary>
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public static Selection Create(TextArea textArea, int startOffset, int endOffset)
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{
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if (textArea == null)
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throw new ArgumentNullException("textArea");
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if (startOffset == endOffset)
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return textArea.emptySelection;
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else
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return new SimpleSelection(textArea,
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new TextViewPosition(textArea.Document.GetLocation(startOffset)),
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new TextViewPosition(textArea.Document.GetLocation(endOffset)));
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}
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internal static Selection Create(TextArea textArea, TextViewPosition start, TextViewPosition end)
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{
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if (textArea == null)
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throw new ArgumentNullException("textArea");
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if (textArea.Document.GetOffset(start.Location) == textArea.Document.GetOffset(end.Location) && start.VisualColumn == end.VisualColumn)
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return textArea.emptySelection;
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else
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return new SimpleSelection(textArea, start, end);
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}
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/// <summary>
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/// Creates a new simple selection that selects the text in the specified segment.
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/// </summary>
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public static Selection Create(TextArea textArea, ISegment segment)
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{
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if (segment == null)
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throw new ArgumentNullException("segment");
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return Create(textArea, segment.Offset, segment.EndOffset);
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}
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internal readonly TextArea textArea;
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/// <summary>
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/// Constructor for Selection.
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/// </summary>
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protected Selection(TextArea textArea)
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{
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if (textArea == null)
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throw new ArgumentNullException("textArea");
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this.textArea = textArea;
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}
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/// <summary>
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/// Gets the start position of the selection.
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/// </summary>
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public abstract TextViewPosition StartPosition { get; }
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/// <summary>
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/// Gets the end position of the selection.
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/// </summary>
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public abstract TextViewPosition EndPosition { get; }
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/// <summary>
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/// Gets the selected text segments.
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/// </summary>
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public abstract IEnumerable<SelectionSegment> Segments { get; }
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/// <summary>
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/// Gets the smallest segment that contains all segments in this selection.
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/// May return null if the selection is empty.
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/// </summary>
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public abstract ISegment SurroundingSegment { get; }
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/// <summary>
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/// Replaces the selection with the specified text.
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/// </summary>
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public abstract void ReplaceSelectionWithText(string newText);
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internal string AddSpacesIfRequired(string newText, TextViewPosition start, TextViewPosition end)
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{
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if (EnableVirtualSpace && InsertVirtualSpaces(newText, start, end)) {
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var line = textArea.Document.GetLineByNumber(start.Line);
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string lineText = textArea.Document.GetText(line);
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var vLine = textArea.TextView.GetOrConstructVisualLine(line);
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int colDiff = start.VisualColumn - vLine.VisualLengthWithEndOfLineMarker;
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if (colDiff > 0) {
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string additionalSpaces = "";
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if (!textArea.Options.ConvertTabsToSpaces && lineText.Trim('\t').Length == 0) {
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int tabCount = (int)(colDiff / textArea.Options.IndentationSize);
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additionalSpaces = new string('\t', tabCount);
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colDiff -= tabCount * textArea.Options.IndentationSize;
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}
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additionalSpaces += new string(' ', colDiff);
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return additionalSpaces + newText;
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}
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}
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return newText;
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}
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bool InsertVirtualSpaces(string newText, TextViewPosition start, TextViewPosition end)
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{
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return (!string.IsNullOrEmpty(newText) || !(IsInVirtualSpace(start) && IsInVirtualSpace(end)))
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&& newText != "\r\n"
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&& newText != "\n"
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&& newText != "\r";
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}
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bool IsInVirtualSpace(TextViewPosition pos)
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{
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return pos.VisualColumn > textArea.TextView.GetOrConstructVisualLine(textArea.Document.GetLineByNumber(pos.Line)).VisualLength;
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}
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/// <summary>
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/// Updates the selection when the document changes.
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/// </summary>
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public abstract Selection UpdateOnDocumentChange(DocumentChangeEventArgs e);
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/// <summary>
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/// Gets whether the selection is empty.
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/// </summary>
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public virtual bool IsEmpty {
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get { return Length == 0; }
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}
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/// <summary>
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/// Gets whether virtual space is enabled for this selection.
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/// </summary>
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public virtual bool EnableVirtualSpace {
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get { return textArea.Options.EnableVirtualSpace; }
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}
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/// <summary>
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/// Gets the selection length.
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/// </summary>
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public abstract int Length { get; }
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/// <summary>
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/// Returns a new selection with the changed end point.
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/// </summary>
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/// <exception cref="NotSupportedException">Cannot set endpoint for empty selection</exception>
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public abstract Selection SetEndpoint(TextViewPosition endPosition);
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/// <summary>
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/// If this selection is empty, starts a new selection from <paramref name="startPosition"/> to
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/// <paramref name="endPosition"/>, otherwise, changes the endpoint of this selection.
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/// </summary>
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public abstract Selection StartSelectionOrSetEndpoint(TextViewPosition startPosition, TextViewPosition endPosition);
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/// <summary>
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/// Gets whether the selection is multi-line.
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/// </summary>
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public virtual bool IsMultiline {
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get {
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ISegment surroundingSegment = this.SurroundingSegment;
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if (surroundingSegment == null)
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return false;
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int start = surroundingSegment.Offset;
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int end = start + surroundingSegment.Length;
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var document = textArea.Document;
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if (document == null)
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throw ThrowUtil.NoDocumentAssigned();
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return document.GetLineByOffset(start) != document.GetLineByOffset(end);
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}
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}
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/// <summary>
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/// Gets the selected text.
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/// </summary>
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public virtual string GetText()
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{
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var document = textArea.Document;
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if (document == null)
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throw ThrowUtil.NoDocumentAssigned();
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StringBuilder b = null;
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string text = null;
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foreach (ISegment s in Segments) {
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if (text != null) {
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if (b == null)
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b = new StringBuilder(text);
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else
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b.Append(text);
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}
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text = document.GetText(s);
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}
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if (b != null) {
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if (text != null) b.Append(text);
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return b.ToString();
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} else {
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return text ?? string.Empty;
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}
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}
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/// <summary>
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/// Creates a HTML fragment for the selected text.
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/// </summary>
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public string CreateHtmlFragment(HtmlOptions options)
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{
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if (options == null)
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throw new ArgumentNullException("options");
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IHighlighter highlighter = textArea.GetService(typeof(IHighlighter)) as IHighlighter;
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StringBuilder html = new StringBuilder();
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bool first = true;
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foreach (ISegment selectedSegment in this.Segments) {
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if (first)
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first = false;
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else
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html.AppendLine("<br>");
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html.Append(HtmlClipboard.CreateHtmlFragment(textArea.Document, highlighter, selectedSegment, options));
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}
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return html.ToString();
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}
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/// <inheritdoc/>
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public abstract override bool Equals(object obj);
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/// <inheritdoc/>
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public abstract override int GetHashCode();
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/// <summary>
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/// Gets whether the specified offset is included in the selection.
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/// </summary>
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/// <returns>True, if the selection contains the offset (selection borders inclusive);
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/// otherwise, false.</returns>
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public virtual bool Contains(int offset)
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{
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if (this.IsEmpty)
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return false;
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if (this.SurroundingSegment.Contains(offset)) {
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foreach (ISegment s in this.Segments) {
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if (s.Contains(offset)) {
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return true;
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}
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}
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}
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return false;
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}
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/// <summary>
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/// Creates a data object containing the selection's text.
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/// </summary>
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public virtual DataObject CreateDataObject(TextArea textArea)
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{
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string text = GetText();
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// Ensure we use the appropriate newline sequence for the OS
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DataObject data = new DataObject(TextUtilities.NormalizeNewLines(text, Environment.NewLine));
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// we cannot use DataObject.SetText - then we cannot drag to SciTe
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// (but dragging to Word works in both cases)
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// Also copy text in HTML format to clipboard - good for pasting text into Word
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// or to the SharpDevelop forums.
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HtmlClipboard.SetHtml(data, CreateHtmlFragment(new HtmlOptions(textArea.Options)));
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return data;
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}
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}
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}
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