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Viewing changes to src/core/Mono.Texteditor/Mono.TextEditor/ISelectionSurroundingProvider.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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src/core/Mono.Texteditor/Mono.TextEditor/ISelectionSurroundingProvider.cs
 
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//
 
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// ISelectionSurroundingProvider.cs
 
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//
 
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// Author:
 
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//       Mike Krüger <mkrueger@xamarin.com>
 
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//
 
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// Copyright (c) 2012 Xamarin Inc. (http://xamarin.com)
 
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//
 
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// Permission is hereby granted, free of charge, to any person obtaining a copy
 
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// of this software and associated documentation files (the "Software"), to deal
 
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// in the Software without restriction, including without limitation the rights
 
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 
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// copies of the Software, and to permit persons to whom the Software is
 
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// 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
 
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// all copies or 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
 
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 
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// THE SOFTWARE.
 
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using System;
 
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namespace Mono.TextEditor
 
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{
 
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        /// <summary>
 
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        /// A selection surrounding provider handles a special handling how the text editor behaves when the user
 
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        /// types a key with a selection. The selection can be surrounded instead of beeing replaced.
 
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        /// </summary>
 
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        public interface ISelectionSurroundingProvider  
 
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        {
 
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                /// <summary>
 
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                /// Gets the selection surroundings for a given unicode key.
 
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                /// </summary>
 
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                /// <returns>
 
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                /// true, if the key is valid for a surrounding action.
 
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                /// </returns>
 
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                /// <param name='unicodeKey'>
 
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                /// The key to handle.
 
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                /// </param>
 
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                /// <param name='start'>
 
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                /// The start of the surrounding
 
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                /// </param>
 
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                /// <param name='end'>
 
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                /// The end of the surrounding
 
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                /// </param>
 
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                bool GetSelectionSurroundings (TextEditorData textEditorData, uint unicodeKey, out string start, out string end);
 
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                void HandleSpecialSelectionKey (TextEditorData textEditorData, uint unicodeKey);
 
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        }
 
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        /// <summary>
 
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        /// Null selection surrounding provider. Basically turns off that feature.
 
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        /// </summary>
 
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        public sealed class NullSelectionSurroundingProvider : ISelectionSurroundingProvider
 
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        {
 
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                public bool GetSelectionSurroundings (TextEditorData textEditorData, uint unicodeKey, out string start, out string end)
 
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                {
 
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                        start = end = "";
 
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                        return false;
 
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                }
 
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                public void HandleSpecialSelectionKey (TextEditorData textEditorData, uint unicodeKey)
 
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                {
 
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                        throw new NotSupportedException ();
 
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                }
 
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        }
 
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        /// <summary>
 
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        /// Default selection surrounding provider.
 
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        /// </summary>
 
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        public class DefaultSelectionSurroundingProvider : ISelectionSurroundingProvider
 
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        {
 
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                public virtual bool GetSelectionSurroundings (TextEditorData textEditorData, uint unicodeKey, out string start, out string end)
 
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                {
 
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                        switch ((char)unicodeKey) {
 
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                        case '"':
 
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                                start = end = "\"";
 
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                                return true;
 
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                        case '\'':
 
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                                start = end = "'";
 
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                                return true;
 
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                        case '(':
 
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                                start = "(";
 
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                                end = ")";
 
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                                return true;
 
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                        case '<':
 
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                                start = "<";
 
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                                end = ">";
 
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                                return true;
 
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                        case '[':
 
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                                start = "[";
 
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                                end = "]";
 
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                                return true;
 
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                        case '{':
 
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                                start = "{";
 
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                                end = "}";
 
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                                return true;
 
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                        default:
 
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                                start = end = "";
 
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                                return false;
 
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                        }
 
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                }
 
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                public virtual void HandleSpecialSelectionKey (TextEditorData textEditorData,uint unicodeKey)
 
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                {
 
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                        string start, end;
 
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                        GetSelectionSurroundings (textEditorData, unicodeKey, out start, out end);
 
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                        if (textEditorData.MainSelection.SelectionMode == SelectionMode.Block) {
 
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                                var selection = textEditorData.MainSelection;
 
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                                int startCol = System.Math.Min (selection.Anchor.Column, selection.Lead.Column) - 1;
 
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                                int endCol = System.Math.Max (selection.Anchor.Column, selection.Lead.Column);
 
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                                for (int lineNumber = selection.MinLine; lineNumber <= selection.MaxLine; lineNumber++) {
 
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                                        DocumentLine lineSegment = textEditorData.GetLine (lineNumber);
 
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                                        if (lineSegment.Offset + startCol < lineSegment.EndOffset)
 
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                                                textEditorData.Insert (lineSegment.Offset + startCol, start);
 
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                                        if (lineSegment.Offset + endCol < lineSegment.EndOffset)
 
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                                                textEditorData.Insert (lineSegment.Offset + endCol, end);
 
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                                }
 
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                                textEditorData.MainSelection = new Selection (
 
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                                        new DocumentLocation (selection.Anchor.Line, endCol == selection.Anchor.Column ? endCol + start.Length : startCol + 1 + start.Length),
 
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                                        new DocumentLocation (selection.Lead.Line, endCol == selection.Anchor.Column ? startCol + 1 + start.Length : endCol + start.Length),
 
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                                        Mono.TextEditor.SelectionMode.Block);
 
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                                textEditorData.Document.CommitMultipleLineUpdate (textEditorData.MainSelection.MinLine, textEditorData.MainSelection.MaxLine);
 
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                        } else {
 
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                                int anchorOffset = textEditorData.MainSelection.GetAnchorOffset (textEditorData);
 
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                                int leadOffset = textEditorData.MainSelection.GetLeadOffset (textEditorData);
 
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                                if (leadOffset < anchorOffset) {
 
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                                        int tmp = anchorOffset;
 
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                                        anchorOffset = leadOffset;
 
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                                        leadOffset = tmp;
 
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                                }
 
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                                textEditorData.Insert (anchorOffset, start);
 
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                                textEditorData.Insert (leadOffset >= anchorOffset ? leadOffset + start.Length : leadOffset, end);
 
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                                textEditorData.SetSelection (anchorOffset + start.Length, leadOffset + start.Length);
 
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                        }
 
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                }
 
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        }
 
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}
 
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