CursorKeys.cs


1:	// CursorKeys.cs
2:	// Copyright (C) 2000 Mike Krueger
3:	// Copyright (C) 2000 Andrea Paatz
4:	//
5:	// This program is free software; you can redistribute it and/or modify
6:	// it under the terms of the GNU General Public License as published by
7:	// the Free Software Foundation; either version 2 of the License, or
8:	// (at your option) any later version.
9:	//
10:	// This program is distributed in the hope that it will be useful,
11:	// but WITHOUT ANY WARRANTY; without even the implied warranty of
12:	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13:	// GNU General Public License for more details.
14:	//
15:	// You should have received a copy of the GNU General Public License
16:	// along with this program; if not, write to the Free Software
17:	// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18:
19:	using System.Drawing;
20:	using System.Windows.Forms;
21:	using System;
22:
23:	using SharpDevelop.DefaultEditor.Text;
24:
25:	namespace SharpDevelop.DefaultEditor.Actions {
26:
27:	public class CaretLeft : AbstractEditAction
28:	{
29:	public override void Execute(IEditActionServices services)
30:	{
31:	int curLineNr = services.Document.GetLineNumberOfOffset(services.Document.Caret.Offset);
32:	int curLineOffset = services.Document.GetLineOffset(curLineNr);
33:
34:	int relOffset = services.Document.Caret.Offset - curLineOffset;
35:
36:	if (relOffset > 0) {
37:	--services.Document.Caret.Offset;
38:	} else if (curLineNr > 0) {
39:	LineSegment lineAbove = services.Document.GetLineSegment(curLineNr - 1);
40:	services.Document.Caret.Offset = lineAbove.Offset + lineAbove.Length;
41:	}
42:	services.Document.SetDesiredColumn();
43:	}
44:	}
45:
46:
47:	public class CaretRight : AbstractEditAction
48:	{
49:	public override void Execute(IEditActionServices services)
50:	{
51:	int curLineNr = services.Document.GetLineNumberOfOffset(services.Document.Caret.Offset);
52:	int curLineOffset = services.Document.GetLineOffset(curLineNr);
53:
54:	int relOffset = services.Document.Caret.Offset - curLineOffset;
55:
56:	if (relOffset < services.Document.GetLineSegment(curLineNr).Length) {
57:	++services.Document.Caret.Offset;
58:	} else if (curLineNr < services.Document.TotalNumberOfLines - 1) {
59:	services.Document.Caret.Offset = services.Document.GetLineOffset(curLineNr + 1);
60:	}
61:
62:	services.Document.SetDesiredColumn();
63:	}
64:	}
65:
66:
67:	public class CaretUp : AbstractEditAction
68:	{
69:	public override void Execute(IEditActionServices services)
70:	{
71:	int curLineNr = services.Document.GetLineNumberOfOffset(services.Document.Caret.Offset);
72:
73:	if (curLineNr > 0) {
74:	LineSegment line = services.Document.GetLineSegment(curLineNr - 1);
75:	services.Document.SetCaretToDesiredColumn(line);
76:	}
77:	}
78:	}
79:
80:
81:	public class CaretDown : AbstractEditAction
82:	{
83:	public override void Execute(IEditActionServices services)
84:	{
85:	int curLineNr = services.Document.GetLineNumberOfOffset(services.Document.Caret.Offset);
86:
87:	if (curLineNr + 1 < services.Document.TotalNumberOfLines) {
88:	LineSegment line = services.Document.GetLineSegment(curLineNr + 1);
89:	services.Document.SetCaretToDesiredColumn(line);
90:	}
91:	}
92:	}
93:
94:
95:	public class WordRight : CaretRight
96:	{
97:	public override void Execute(IEditActionServices services)
98:	{
99:	LineSegment line = services.Document.GetLineSegmentOfOffset(services.Document.Caret.Offset);
100:	if (services.Document.Caret.Offset == line.Offset + line.Length \|\| line.Length == 0) {
101:	base.Execute(services);
102:	} else {
103:	int nextWordStart = TextUtilities.FindNextWordEnd(services.Document, services.Document.Caret.Offset);
104:	services.Document.Caret.Offset = nextWordStart;
105:	}
106:	services.Document.SetDesiredColumn();
107:	}
108:	}
109:
110:
111:	public class WordLeft : CaretLeft
112:	{
113:	public override void Execute(IEditActionServices services)
114:	{
115:	LineSegment line = services.Document.GetLineSegmentOfOffset(services.Document.Caret.Offset);
116:	if (services.Document.Caret.Offset == line.Offset \|\| line.Length == 0) {
117:	base.Execute(services);
118:	} else {
119:	int prevWordStart = TextUtilities.FindPrevWordStart(services.Document, services.Document.Caret.Offset);
120:	services.Document.Caret.Offset = prevWordStart;
121:	}
122:	services.Document.SetDesiredColumn();
123:	}
124:	}
125:
126:
127:	public class ScrollLineUp : AbstractEditAction
128:	{
129:	public override void Execute(IEditActionServices services)
130:	{
131:	services.AutoClearSelection = false;
132:	services.FirstVisibleLine = Math.Max(0, services.FirstVisibleLine - 1);
133:	}
134:	}
135:
136:
137:	public class ScrollLineDown : AbstractEditAction
138:	{
139:	public override void Execute(IEditActionServices services)
140:	{
141:	services.AutoClearSelection = false;
142:	services.FirstVisibleLine = Math.Max(0, Math.Min(services.Document.TotalNumberOfLines - 3, services.FirstVisibleLine + 1));
143:	}
144:	}
145:	}