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Copy pathPythonEditingCommandHandler.cs
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223 lines (201 loc) · 8.54 KB
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// Copyright (c) 2010 Joe Moorhouse
using ICSharpCode.AvalonEdit;
using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Editing;
using ICSharpCode.AvalonEdit.Highlighting;
using System;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Input;
namespace PythonConsoleControl
{
/// <summary>
/// Commands that only involve the text editor are outsourced to here.
/// </summary>
internal class PythonEditingCommandHandler
{
private PythonTextEditor textEditor;
private TextArea textArea;
public PythonEditingCommandHandler(PythonTextEditor textEditor)
{
this.textEditor = textEditor;
this.textArea = textEditor.textArea;
}
internal static void CanCutOrCopy(object target, CanExecuteRoutedEventArgs args)
{
// HasSomethingSelected for copy and cut commands
TextArea textArea = GetTextArea(target);
if (textArea != null && textArea.Document != null)
{
args.CanExecute = textArea.Options.CutCopyWholeLine || !textArea.Selection.IsEmpty;
args.Handled = true;
}
}
internal static TextArea GetTextArea(object target)
{
return target as TextArea;
}
internal static void OnCopy(object target, ExecutedRoutedEventArgs args)
{
TextArea textArea = GetTextArea(target);
if (textArea != null && textArea.Document != null)
{
if (textArea.Selection.IsEmpty && textArea.Options.CutCopyWholeLine)
{
DocumentLine currentLine = textArea.Document.GetLineByNumber(textArea.Caret.Line);
CopyWholeLine(textArea, currentLine);
}
else
{
CopySelectedText(textArea);
}
args.Handled = true;
}
}
internal static void OnCut(object target, ExecutedRoutedEventArgs args)
{
TextArea textArea = GetTextArea(target);
if (textArea != null && textArea.Document != null)
{
if (textArea.Selection.IsEmpty && textArea.Options.CutCopyWholeLine)
{
DocumentLine currentLine = textArea.Document.GetLineByNumber(textArea.Caret.Line);
CopyWholeLine(textArea, currentLine);
textArea.Document.Remove(currentLine.Offset, currentLine.TotalLength);
}
else
{
CopySelectedText(textArea);
textArea.Selection.ReplaceSelectionWithText(string.Empty);
}
textArea.Caret.BringCaretToView();
args.Handled = true;
}
}
internal static void CopySelectedText(TextArea textArea)
{
var data = textArea.Selection.CreateDataObject(textArea);
try
{
Clipboard.SetDataObject(data, true);
}
catch (ExternalException)
{
// Apparently this exception sometimes happens randomly.
// The MS controls just ignore it, so we'll do the same.
return;
}
string text = textArea.Selection.GetText();
text = TextUtilities.NormalizeNewLines(text, Environment.NewLine);
//textArea.OnTextCopied(new TextEventArgs(text));
}
internal static void CopyWholeLine(TextArea textArea, DocumentLine line)
{
ISegment wholeLine = new VerySimpleSegment(line.Offset, line.TotalLength);
string text = textArea.Document.GetText(wholeLine);
// Ensure we use the appropriate newline sequence for the OS
text = TextUtilities.NormalizeNewLines(text, Environment.NewLine);
DataObject data = new DataObject(text);
// Also copy text in HTML format to clipboard - good for pasting text into Word
// or to the SharpDevelop forums.
IHighlighter highlighter = textArea.GetService(typeof(IHighlighter)) as IHighlighter;
HtmlClipboard.SetHtml(data, HtmlClipboard.CreateHtmlFragment(textArea.Document, highlighter, wholeLine, new HtmlOptions(textArea.Options)));
MemoryStream lineSelected = new MemoryStream(1);
lineSelected.WriteByte(1);
data.SetData(LineSelectedType, lineSelected, false);
try
{
Clipboard.SetDataObject(data, true);
}
catch (ExternalException)
{
// Apparently this exception sometimes happens randomly.
// The MS controls just ignore it, so we'll do the same.
return;
}
//textArea.OnTextCopied(new TextEventArgs(text));
}
internal static ExecutedRoutedEventHandler OnDelete(RoutedUICommand selectingCommand)
{
return (target, args) =>
{
TextArea textArea = GetTextArea(target);
if (textArea != null && textArea.Document != null)
{
// call BeginUpdate before running the 'selectingCommand'
// so that undoing the delete does not select the deleted character
using (textArea.Document.RunUpdate())
{
Type textAreaType = textArea.GetType();
MethodInfo method;
if (textArea.Selection.IsEmpty)
{
TextViewPosition oldCaretPosition = textArea.Caret.Position;
selectingCommand.Execute(args.Parameter, textArea);
bool hasSomethingDeletable = false;
foreach (ISegment s in textArea.Selection.Segments)
{
method = textAreaType.GetMethod("GetDeletableSegments", BindingFlags.Instance | BindingFlags.NonPublic);
//textArea.GetDeletableSegments(s).Length > 0)
if ((int)method.Invoke(textArea, new Object[] { s }) > 0)
{
hasSomethingDeletable = true;
break;
}
}
if (!hasSomethingDeletable)
{
// If nothing in the selection is deletable; then reset caret+selection
// to the previous value. This prevents the caret from moving through read-only sections.
textArea.Caret.Position = oldCaretPosition;
//textArea.Selection = Selection.Empty;
}
}
method = textAreaType.GetMethod("RemoveSelectedText", BindingFlags.Instance | BindingFlags.NonPublic);
method.Invoke(textArea, new Object[] { });
//textArea.RemoveSelectedText();
}
textArea.Caret.BringCaretToView();
args.Handled = true;
}
};
}
internal static void CanDelete(object target, CanExecuteRoutedEventArgs args)
{
// HasSomethingSelected for delete command
TextArea textArea = GetTextArea(target);
if (textArea != null && textArea.Document != null)
{
args.CanExecute = !textArea.Selection.IsEmpty;
args.Handled = true;
}
}
private const string LineSelectedType = "MSDEVLineSelect"; // This is the type VS 2003 and 2005 use for flagging a whole line copy
private struct VerySimpleSegment : ISegment
{
public readonly int Offset, Length;
int ISegment.Offset
{
get { return Offset; }
}
int ISegment.Length
{
get { return Length; }
}
public int EndOffset
{
get
{
return Offset + Length;
}
}
public VerySimpleSegment(int offset, int length)
{
this.Offset = offset;
this.Length = length;
}
}
}
}