/*
* DBeaver - Universal Database Manager
* Copyright (C) 2010-2017 Serge Rider (serge@jkiss.org)
*
* 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.jkiss.dbeaver.ui.editors.binary;
import org.eclipse.swt.custom.StyledTextContent;
import org.eclipse.swt.custom.TextChangeListener;
import org.eclipse.swt.custom.TextChangedEvent;
import org.eclipse.swt.custom.TextChangingEvent;
import java.util.HashSet;
import java.util.Set;
/**
* StyledTextContent customised for content that fills up to one page of the StyledText widget. No line
* delimiters, content wraps lines.
*
* @author Jordi
*/
public class DisplayedContent implements StyledTextContent {
private StringBuilder data = null;
private Set<TextChangeListener> textListeners = null;
private int numberOfColumns = -1;
//private int numberOfLines = -1;
private int linesTimesColumns = -1;
/**
* Create empty content for a StyledText of the specified size
*
* @param numberOfLines
* @param numberOfColumns
*/
DisplayedContent(int numberOfColumns, int numberOfLines)
{
data = new StringBuilder(numberOfColumns * numberOfLines * 2); // account for replacements
textListeners = new HashSet<>();
setDimensions(numberOfColumns, numberOfLines);
}
@Override
public void addTextChangeListener(TextChangeListener listener)
{
if (listener == null) throw new IllegalArgumentException("Cannot add a null listener");
textListeners.add(listener);
}
@Override
public int getCharCount()
{
return data.length();
}
@Override
public String getLine(int lineIndex)
{
return getTextRange(lineIndex * numberOfColumns, numberOfColumns);
}
@Override
public int getLineAtOffset(int offset)
{
int result = offset / numberOfColumns;
if (result >= getLineCount())
return getLineCount() - 1;
return result;
}
@Override
public int getLineCount()
{
return (data.length() - 1) / numberOfColumns + 1;
}
@Override
public String getLineDelimiter()
{
return "";
}
@Override
public int getOffsetAtLine(int lineIndex)
{
return lineIndex * numberOfColumns;
}
@Override
public String getTextRange(int start, int length)
{
int dataLength = data.length();
if (start > dataLength)
return "";
return data.substring(start, Math.min(dataLength, start + length));
}
@Override
public void removeTextChangeListener(TextChangeListener listener)
{
if (listener == null) throw new IllegalArgumentException("Cannot remove a null listener");
textListeners.remove(listener);
}
/**
* Replaces part of the content with new text. Works only when the new text length is the same as
* replaceLength (when the content's size won't change). For other cases use <code>setText()</code> or
* <code>shiftLines()</code> instead.
*
* @see org.eclipse.swt.custom.StyledTextContent#replaceTextRange(int, int, java.lang.String)
*/
@Override
public void replaceTextRange(int start, int replaceLength, String text)
{
int length = text.length();
if (length != replaceLength || start + length > data.length())
return;
data.replace(start, start + length, text);
}
void setDimensions(int columns, int lines)
{
numberOfColumns = columns <= 0 ? 1 : columns;
//numberOfLines = lines;
linesTimesColumns = lines * columns;
setText(data.toString());
}
/**
* @see org.eclipse.swt.custom.StyledTextContent#setText(java.lang.String)
*/
@Override
public void setText(String text)
{
data.setLength(0);
data.append(text.substring(0, Math.min(text.length(), linesTimesColumns)));
TextChangedEvent changedEvent = new TextChangedEvent(this);
for (TextChangeListener textListener : textListeners) {
textListener.textSet(changedEvent);
}
}
/**
* Shifts full lines of text and fills the new empty space with text
*
* @param text to replace new empty lines. Its size determines the number of lines to shift
* @param forward shifts lines either forward or backward
*/
public void shiftLines(String text, boolean forward)
{
if (text.length() == 0) return;
int linesInText = (text.length() - 1) / numberOfColumns + 1;
int currentLimit = Math.min(data.length(), linesTimesColumns);
TextChangingEvent event = new TextChangingEvent(this);
event.start = forward ? 0 : currentLimit;
event.newText = text;
event.replaceCharCount = 0;
event.newCharCount = text.length();
event.replaceLineCount = 0;
event.newLineCount = linesInText;
for (TextChangeListener myTextListener : textListeners) myTextListener.textChanging(event);
data.insert(event.start, text);
TextChangedEvent changedEvent = new TextChangedEvent(this);
for (TextChangeListener myTextListener : textListeners) myTextListener.textChanged(changedEvent);
event = new TextChangingEvent(this);
// event.start = forward ? linesTimesColumns : 0;
event.start = forward ? linesTimesColumns - 1 : 0;
event.newText = "";
event.replaceCharCount = linesInText * numberOfColumns - linesTimesColumns + currentLimit;
event.newCharCount = 0;
event.replaceLineCount = linesInText;
event.newLineCount = 0;
for (TextChangeListener myTextListener : textListeners) myTextListener.textChanging(event);
// data.delete(event.start, event.start + event.replaceCharCount);
if (forward)
data.delete(linesTimesColumns, linesTimesColumns + event.replaceCharCount);
else
data.delete(0, event.replaceCharCount);
changedEvent = new TextChangedEvent(this);
for (TextChangeListener myTextListener : textListeners) myTextListener.textChanged(changedEvent);
}
}