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/*
* ConnectBot: simple, powerful, open-source SSH client for Android
* Copyright 2007 Kenny Root, Jeffrey Sharkey
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.connectbot.bean;
import de.mud.terminal.VDUBuffer;
/**
* @author Kenny Root
* Keep track of a selection area for the terminal copying mechanism.
* If the orientation is flipped one way, swap the bottom and top or
* left and right to keep it in the correct orientation.
*/
public class SelectionArea {
private int top;
private int bottom;
private int left;
private int right;
private int maxColumns;
private int maxRows;
private boolean selectingOrigin;
public SelectionArea() {
reset();
}
public final void reset() {
top = left = bottom = right = 0;
selectingOrigin = true;
}
/**
* @param columns
* @param rows
*/
public void setBounds(int columns, int rows) {
maxColumns = columns - 1;
maxRows = rows - 1;
}
private int checkBounds(int value, int max) {
if (value < 0)
return 0;
else if (value > max)
return max;
else
return value;
}
public boolean isSelectingOrigin() {
return selectingOrigin;
}
public void finishSelectingOrigin() {
selectingOrigin = false;
}
public void decrementRow() {
if (selectingOrigin)
setTop(top - 1);
else
setBottom(bottom - 1);
}
public void incrementRow() {
if (selectingOrigin)
setTop(top + 1);
else
setBottom(bottom + 1);
}
public void setRow(int row) {
if (selectingOrigin)
setTop(row);
else
setBottom(row);
}
private void setTop(int top) {
this.top = bottom = checkBounds(top, maxRows);
}
public int getTop() {
return Math.min(top, bottom);
}
private void setBottom(int bottom) {
this.bottom = checkBounds(bottom, maxRows);
}
public int getBottom() {
return Math.max(top, bottom);
}
public void decrementColumn() {
if (selectingOrigin)
setLeft(left - 1);
else
setRight(right - 1);
}
public void incrementColumn() {
if (selectingOrigin)
setLeft(left + 1);
else
setRight(right + 1);
}
public void setColumn(int column) {
if (selectingOrigin)
setLeft(column);
else
setRight(column);
}
private void setLeft(int left) {
this.left = right = checkBounds(left, maxColumns);
}
public int getLeft() {
return Math.min(left, right);
}
private void setRight(int right) {
this.right = checkBounds(right, maxColumns);
}
public int getRight() {
return Math.max(left, right);
}
public String copyFrom(VDUBuffer vb) {
int size = (getRight() - getLeft() + 1) * (getBottom() - getTop() + 1);
StringBuffer buffer = new StringBuffer(size);
for (int y = getTop(); y <= getBottom(); y++) {
int lastNonSpace = buffer.length();
for (int x = getLeft(); x <= getRight(); x++) {
// only copy printable chars
char c = vb.getChar(x, y);
if (!Character.isDefined(c) ||
(Character.isISOControl(c) && c != '\t'))
c = ' ';
if (c != ' ')
lastNonSpace = buffer.length();
buffer.append(c);
}
// Don't leave a bunch of spaces in our copy buffer.
if (buffer.length() > lastNonSpace)
buffer.delete(lastNonSpace + 1, buffer.length());
if (y != bottom)
buffer.append("\n");
}
return buffer.toString();
}
@Override
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append("SelectionArea[top=");
buffer.append(top);
buffer.append(", bottom=");
buffer.append(bottom);
buffer.append(", left=");
buffer.append(left);
buffer.append(", right=");
buffer.append(right);
buffer.append(", maxColumns=");
buffer.append(maxColumns);
buffer.append(", maxRows=");
buffer.append(maxRows);
buffer.append(", isSelectingOrigin=");
buffer.append(isSelectingOrigin());
buffer.append("]");
return buffer.toString();
}
}
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