1/*
2 * ConnectBot: simple, powerful, open-source SSH client for Android
3 * Copyright 2007 Kenny Root, Jeffrey Sharkey
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18package org.connectbot.util;
19
20import de.mud.terminal.VDUBuffer;
21
22/**
23 * Keep track of a selection area for the terminal copying mechanism.
24 * If the orientation is flipped one way, swap the bottom and top or
25 * left and right to keep it in the correct orientation.
26 */
27public class SelectionArea {
28	private int top;
29	private int bottom;
30	private int left;
31	private int right;
32	private int maxColumns;
33	private int maxRows;
34	private boolean selectingOrigin;
35
36	public SelectionArea() {
37		reset();
38	}
39
40	public final void reset() {
41		top = left = bottom = right = 0;
42		selectingOrigin = true;
43	}
44
45	/**
46	 * @param columns
47	 * @param rows
48	 */
49	public void setBounds(int columns, int rows) {
50		maxColumns = columns - 1;
51		maxRows = rows - 1;
52	}
53
54	private int checkBounds(int value, int max) {
55		if (value < 0)
56			return 0;
57		else if (value > max)
58			return max;
59		else
60			return value;
61	}
62
63	public boolean isSelectingOrigin() {
64		return selectingOrigin;
65	}
66
67	public void finishSelectingOrigin() {
68		selectingOrigin = false;
69	}
70
71	public void decrementRow() {
72		if (selectingOrigin)
73			setTop(top - 1);
74		else
75			setBottom(bottom - 1);
76	}
77
78	public void incrementRow() {
79		if (selectingOrigin)
80			setTop(top + 1);
81		else
82			setBottom(bottom + 1);
83	}
84
85	public void setRow(int row) {
86		if (selectingOrigin)
87			setTop(row);
88		else
89			setBottom(row);
90	}
91
92	private void setTop(int top) {
93		this.top = bottom = checkBounds(top, maxRows);
94	}
95
96	public int getTop() {
97		return Math.min(top, bottom);
98	}
99
100	private void setBottom(int bottom) {
101		this.bottom = checkBounds(bottom, maxRows);
102	}
103
104	public int getBottom() {
105		return Math.max(top, bottom);
106	}
107
108	public void decrementColumn() {
109		if (selectingOrigin)
110			setLeft(left - 1);
111		else
112			setRight(right - 1);
113	}
114
115	public void incrementColumn() {
116		if (selectingOrigin)
117			setLeft(left + 1);
118		else
119			setRight(right + 1);
120	}
121
122	public void setColumn(int column) {
123		if (selectingOrigin)
124			setLeft(column);
125		else
126			setRight(column);
127	}
128
129	private void setLeft(int left) {
130		this.left = right = checkBounds(left, maxColumns);
131	}
132
133	public int getLeft() {
134		return Math.min(left, right);
135	}
136
137	private void setRight(int right) {
138		this.right = checkBounds(right, maxColumns);
139	}
140
141	public int getRight() {
142		return Math.max(left, right);
143	}
144
145	public String copyFrom(VDUBuffer vb) {
146		int size = (getRight() - getLeft() + 1) * (getBottom() - getTop() + 1);
147
148		StringBuffer buffer = new StringBuffer(size);
149
150		for(int y = getTop(); y <= getBottom(); y++) {
151			int lastNonSpace = buffer.length();
152
153			for (int x = getLeft(); x <= getRight(); x++) {
154				// only copy printable chars
155				char c = vb.getChar(x, y);
156
157				if (!Character.isDefined(c) ||
158						(Character.isISOControl(c) && c != '\t'))
159					c = ' ';
160
161				if (c != ' ')
162					lastNonSpace = buffer.length();
163
164				buffer.append(c);
165			}
166
167			// Don't leave a bunch of spaces in our copy buffer.
168			if (buffer.length() > lastNonSpace)
169				buffer.delete(lastNonSpace + 1, buffer.length());
170
171			if (y != bottom)
172				buffer.append("\n");
173		}
174
175		return buffer.toString();
176	}
177
178	@Override
179	public String toString() {
180		StringBuilder buffer = new StringBuilder();
181
182		buffer.append("SelectionArea[top=");
183		buffer.append(top);
184		buffer.append(", bottom=");
185		buffer.append(bottom);
186		buffer.append(", left=");
187		buffer.append(left);
188		buffer.append(", right=");
189		buffer.append(right);
190		buffer.append(", maxColumns=");
191		buffer.append(maxColumns);
192		buffer.append(", maxRows=");
193		buffer.append(maxRows);
194		buffer.append(", isSelectingOrigin=");
195		buffer.append(isSelectingOrigin());
196		buffer.append("]");
197
198		return buffer.toString();
199	}
200}
201