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/***************************************************************************
* copyright : (C) 2003-2011 by Pascal Brachet *
* http://www.xm1math.net/texmaker/ *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef TEXTBLOCKSELECTION_H
#define TEXTBLOCKSELECTION_H
#include <QTextCursor>
#include <QTextBlock>
class TextBlockSelection
{
public:
bool isValid() const{ return !firstBlock.isNull() && !lastBlock.isNull(); }
void clear() { firstBlock = lastBlock = QTextCursor(); }
QTextCursor firstBlock; // defines the first block
QTextCursor lastBlock; // defines the last block
int firstVisualColumn; // defines the first visual column of the selection
int lastVisualColumn; // defines the last visual column of the selection
enum Anchor {TopLeft = 0, TopRight, BottomLeft, BottomRight} anchor;
TextBlockSelection():firstVisualColumn(0), lastVisualColumn(0), anchor(BottomRight){}
int firstNonSpace(const QString &text) const
{
int i = 0;
while (i < text.size()) {
if (!text.at(i).isSpace())
return i;
++i;
}
return i;
}
bool cursorIsAtBeginningOfLine(const QTextCursor &cursor) const
{
QString text = cursor.block().text();
int fns = firstNonSpace(text);
return (cursor.position() - cursor.block().position() <= fns);
}
void moveAnchor(int blockNumber, int visualColumn)
{
if (visualColumn >= 0) {
if (anchor % 2) {
lastVisualColumn = visualColumn;
if (lastVisualColumn < firstVisualColumn) {
qSwap(firstVisualColumn, lastVisualColumn);
anchor = (Anchor) (anchor - 1);
}
} else {
firstVisualColumn = visualColumn;
if (firstVisualColumn > lastVisualColumn) {
qSwap(firstVisualColumn, lastVisualColumn);
anchor = (Anchor) (anchor + 1);
}
}
}
if (blockNumber >= 0 && blockNumber < firstBlock.document()->blockCount()) {
if (anchor <= TopRight) {
firstBlock.setPosition(firstBlock.document()->findBlockByNumber(blockNumber).position());
if (firstBlock.blockNumber() > lastBlock.blockNumber()) {
qSwap(firstBlock, lastBlock);
anchor = (Anchor) (anchor + 2);
}
} else {
lastBlock.setPosition(firstBlock.document()->findBlockByNumber(blockNumber).position());
if (lastBlock.blockNumber() < firstBlock.blockNumber()) {
qSwap(firstBlock, lastBlock);
anchor = (Anchor) (anchor - 2);
}
}
}
firstBlock.movePosition(QTextCursor::StartOfBlock);
lastBlock.movePosition(QTextCursor::EndOfBlock);
}
inline int anchorColumnNumber() const { return (anchor % 2) ? lastVisualColumn : firstVisualColumn; }
inline int anchorBlockNumber() const {
return (anchor <= TopRight ? firstBlock.blockNumber() : lastBlock.blockNumber()); }
int tabSize;
int columnAt(const QString &text, int position) const
{
int column = 0;
for (int i = 0; i < position; ++i) {
if (text.at(i) == QLatin1Char('\t'))
column = column - (column % tabSize) + tabSize;
else
++column;
}
return column;
}
int positionAtColumn(const QString &text, int column, int *offset) const
{
int col = 0;
int i = 0;
while (i < text.size() && col < column) {
if (text.at(i) == QLatin1Char('\t'))
col = col - (col % tabSize) + tabSize;
else
++col;
++i;
}
if (offset)
*offset = column - col;
return i;
}
QTextCursor selection() const
{
QTextCursor cursor = firstBlock;
if (anchor <= TopRight) {
cursor.setPosition(lastBlock.block().position() + positionAtColumn(lastBlock.block().text(), lastVisualColumn,0));
cursor.setPosition(firstBlock.block().position() + positionAtColumn(firstBlock.block().text(), firstVisualColumn,0),
QTextCursor::KeepAnchor);
} else {
cursor.setPosition(firstBlock.block().position() + positionAtColumn(firstBlock.block().text(), firstVisualColumn,0));
cursor.setPosition(lastBlock.block().position() + positionAtColumn(lastBlock.block().text(), lastVisualColumn,0),
QTextCursor::KeepAnchor);
}
return cursor;
}
void fromSelection(const QTextCursor &selection)
{
firstBlock = selection;
firstBlock.setPosition(selection.selectionStart());
firstVisualColumn = columnAt(firstBlock.block().text(), firstBlock.positionInBlock());
lastBlock = selection;
lastBlock.setPosition(selection.selectionEnd());
lastVisualColumn = columnAt(lastBlock.block().text(), lastBlock.positionInBlock());
if (selection.anchor() > selection.position())
anchor = TopLeft;
else
anchor = BottomRight;
firstBlock.movePosition(QTextCursor::StartOfBlock);
lastBlock.movePosition(QTextCursor::EndOfBlock);
}
};
#endif
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