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/*************************************************************************** |
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File : LineNumberDisplay.cpp |
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Project : QtiPlot |
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-------------------------------------------------------------------- |
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Copyright : (C) 2008 by Ion Vasilief |
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Email (use @ for *) : ion_vasilief*yahoo.fr |
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Description : A widget displaying line numbers for a QTextEdit |
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|
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***************************************************************************/ |
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|
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/*************************************************************************** |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the Free Software * |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, * |
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* Boston, MA 02110-1301 USA * |
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* * |
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***************************************************************************/ |
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#include "LineNumberDisplay.h" |
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#include <QScrollBar> |
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#include <QShowEvent> |
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#include <QPainter> |
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|
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LineNumberDisplay::LineNumberDisplay(QTextEdit *te, QWidget *parent) |
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: QTextEdit(parent), d_text_edit(te) |
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{ |
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setReadOnly(true); |
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setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff); |
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setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff); |
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setFrameStyle(QFrame::Panel | QFrame::Raised); |
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setMaximumWidth(0); |
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setLineWidth(0); |
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setFocusPolicy(Qt::NoFocus); |
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setCurrentFont(te->currentFont()); |
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viewport()->setCursor(Qt::ArrowCursor); |
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|
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QPalette palette = this->palette(); |
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palette.setColor(QPalette::Highlight, palette.color(QPalette::Base)); |
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setPalette(palette); |
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|
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if (te){ |
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connect(this, SIGNAL(selectionChanged()), this, SLOT(updateDocumentSelection())); |
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|
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connect(te->document(), SIGNAL(contentsChanged()), this, SLOT(updateLineNumbers())); |
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connect((QObject *)te->verticalScrollBar(), SIGNAL(valueChanged(int)), |
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(QObject *)verticalScrollBar(), SLOT(setValue(int))); |
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connect(te, SIGNAL(currentCharFormatChanged (const QTextCharFormat &)), |
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this, SLOT(changeCharFormat (const QTextCharFormat &))); |
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} |
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|
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// Disable manual user scrolls |
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this->verticalScrollBar()->setEnabled(false); |
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this->horizontalScrollBar()->setEnabled(false); |
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} |
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|
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void LineNumberDisplay::updateDocumentSelection() |
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{ |
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if (!isVisible() || !d_text_edit) |
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return; |
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|
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QTextCursor c = textCursor(); |
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#if QT_VERSION >= 0x040500 |
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int selectionStart = document()->findBlock(c.selectionStart()).firstLineNumber(); |
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int selectionEnd = document()->findBlock(c.selectionEnd()).firstLineNumber(); |
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#else |
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int selectionStart = document()->findBlock(c.selectionStart()).blockNumber(); |
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int selectionEnd = document()->findBlock(c.selectionEnd()).blockNumber(); |
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#endif |
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int selectedLines = abs(selectionEnd - selectionStart); |
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|
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QTextCursor cursor(d_text_edit->textCursor()); |
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cursor.movePosition(QTextCursor::Start); |
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for (int i = 0; i < selectionStart; i++) |
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cursor.movePosition(QTextCursor::Down); |
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|
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for (int i = 0; i < selectedLines; i++) |
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cursor.movePosition(QTextCursor::Down, QTextCursor::KeepAnchor); |
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|
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cursor.movePosition(QTextCursor::EndOfLine, QTextCursor::KeepAnchor); |
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|
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if (selectionEnd == d_text_edit->document()->blockCount() - 1) |
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cursor.movePosition(QTextCursor::End, QTextCursor::KeepAnchor); |
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|
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d_text_edit->setTextCursor(cursor); |
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} |
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|
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void LineNumberDisplay::updateLineNumbers(bool force) |
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{ |
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if (!isVisible() || !d_text_edit) |
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return; |
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|
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int lines = d_text_edit->document()->blockCount(); |
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if (document()->blockCount() - 1 == lines && !force) |
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return; |
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|
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QString aux; |
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for(int i = 0; i < lines; i++) |
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aux += QString::number(i + 1) + "\n"; |
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|
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setPlainText(aux); |
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|
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QFontMetrics fm(d_text_edit->currentFont(), this); |
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setMaximumWidth(2.5*fm.boundingRect(QString::number(lines)).width()); // 2.5 small fix to display numbers correctly on macos |
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verticalScrollBar()->setValue(d_text_edit->verticalScrollBar()->value()); |
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} |
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|
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void LineNumberDisplay::showEvent(QShowEvent *e) |
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{ |
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e->accept(); |
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if (isVisible()) |
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updateLineNumbers(); |
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} |
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|
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void LineNumberDisplay::changeCharFormat (const QTextCharFormat &f) |
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{ |
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setCurrentFont(f.font()); |
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} |
