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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using System.Windows.Documents;
using ICSharpCode.AvalonEdit.Document;
namespace ICSharpCode.AvalonEdit.Snippets
{
/// <summary>
/// An element that binds to a <see cref="SnippetReplaceableTextElement"/> and displays the same text.
/// </summary>
[Serializable]
public class SnippetBoundElement : SnippetElement
{
SnippetReplaceableTextElement targetElement;
/// <summary>
/// Gets/Sets the target element.
/// </summary>
public SnippetReplaceableTextElement TargetElement {
get { return targetElement; }
set { targetElement = value; }
}
/// <summary>
/// Converts the text before copying it.
/// </summary>
public virtual string ConvertText(string input)
{
return input;
}
/// <inheritdoc/>
public override void Insert(InsertionContext context)
{
if (targetElement != null) {
TextAnchor start = context.Document.CreateAnchor(context.InsertionPosition);
start.MovementType = AnchorMovementType.BeforeInsertion;
start.SurviveDeletion = true;
string inputText = targetElement.Text;
if (inputText != null) {
context.InsertText(ConvertText(inputText));
}
TextAnchor end = context.Document.CreateAnchor(context.InsertionPosition);
end.MovementType = AnchorMovementType.BeforeInsertion;
end.SurviveDeletion = true;
AnchorSegment segment = new AnchorSegment(start, end);
context.RegisterActiveElement(this, new BoundActiveElement(context, targetElement, this, segment));
}
}
/// <inheritdoc/>
public override Inline ToTextRun()
{
if (targetElement != null) {
string inputText = targetElement.Text;
if (inputText != null) {
return new Italic(new Run(ConvertText(inputText)));
}
}
return base.ToTextRun();
}
}
sealed class BoundActiveElement : IActiveElement
{
InsertionContext context;
SnippetReplaceableTextElement targetSnippetElement;
SnippetBoundElement boundElement;
internal IReplaceableActiveElement targetElement;
AnchorSegment segment;
public BoundActiveElement(InsertionContext context, SnippetReplaceableTextElement targetSnippetElement, SnippetBoundElement boundElement, AnchorSegment segment)
{
this.context = context;
this.targetSnippetElement = targetSnippetElement;
this.boundElement = boundElement;
this.segment = segment;
}
public void OnInsertionCompleted()
{
targetElement = context.GetActiveElement(targetSnippetElement) as IReplaceableActiveElement;
if (targetElement != null) {
targetElement.TextChanged += targetElement_TextChanged;
}
}
void targetElement_TextChanged(object sender, EventArgs e)
{
// Don't copy text if the segments overlap (we would get an endless loop).
// This can happen if the user deletes the text between the replaceable element and the bound element.
if (segment.GetOverlap(targetElement.Segment) == SimpleSegment.Invalid) {
int offset = segment.Offset;
int length = segment.Length;
string text = boundElement.ConvertText(targetElement.Text);
if (length != text.Length || text != context.Document.GetText(offset, length)) {
// Call replace only if we're actually changing something.
// Without this check, we would generate an empty undo group when the user pressed undo.
context.Document.Replace(offset, length, text);
if (length == 0) {
// replacing an empty anchor segment with text won't enlarge it, so we have to recreate it
segment = new AnchorSegment(context.Document, offset, text.Length);
}
}
}
}
public void Deactivate(SnippetEventArgs e)
{
}
public bool IsEditable {
get { return false; }
}
public ISegment Segment {
get { return segment; }
}
}
}
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