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Diffstat (limited to 'src/codeeditor.cc')
| -rw-r--r-- | src/codeeditor.cc | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/src/codeeditor.cc b/src/codeeditor.cc new file mode 100644 index 0000000..44b0e9b --- /dev/null +++ b/src/codeeditor.cc @@ -0,0 +1,163 @@ +/**************************************************************************** + ** + ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). + ** Contact: http://www.qt-project.org/legal + ** + ** This file is part of the examples of the Qt Toolkit. + ** + ** $QT_BEGIN_LICENSE:BSD$ + ** You may use this file under the terms of the BSD license as follows: + ** + ** "Redistribution and use in source and binary forms, with or without + ** modification, are permitted provided that the following conditions are + ** met: + ** * Redistributions of source code must retain the above copyright + ** notice, this list of conditions and the following disclaimer. + ** * Redistributions in binary form must reproduce the above copyright + ** notice, this list of conditions and the following disclaimer in + ** the documentation and/or other materials provided with the + ** distribution. + ** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names + ** of its contributors may be used to endorse or promote products derived + ** from this software without specific prior written permission. + ** + ** + ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." + ** + ** $QT_END_LICENSE$ + ** + ****************************************************************************/ + +#include <QtGui> + +#include "codeeditor.h" + + +CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent) +{ + lineNumberArea = new LineNumberArea(this); + + connect(this, SIGNAL(blockCountChanged(int)), + this, SLOT(updateLineNumberAreaWidth(int))); + connect(this, SIGNAL(updateRequest(QRect,int)), + this, SLOT(updateLineNumberArea(QRect,int))); + connect(this, SIGNAL(cursorPositionChanged()), + this, SLOT(highlightCurrentLine())); + + setStyleSheet("font: 12pt \"Courier\";"); + + updateLineNumberAreaWidth(0); + highlightCurrentLine(); +} + + + +int CodeEditor::lineNumberAreaWidth() +{ + int digits = 1; + int max = qMax(1, blockCount()); + while (max >= 10) { + max /= 10; + ++digits; + } + + int space = 3 + fontMetrics().width(QLatin1Char('9')) * digits; + + return space; +} + + + +void CodeEditor::updateLineNumberAreaWidth(int /* newBlockCount */) +{ + setViewportMargins(lineNumberAreaWidth(), 0, 0, 0); +} + + + +void CodeEditor::updateLineNumberArea(const QRect &rect, int dy) +{ + if (dy) + lineNumberArea->scroll(0, dy); + else + lineNumberArea->update(0, rect.y(), lineNumberArea->width(), rect.height()); + + if (rect.contains(viewport()->rect())) + updateLineNumberAreaWidth(0); +} + + + +void CodeEditor::resizeEvent(QResizeEvent *e) +{ + QPlainTextEdit::resizeEvent(e); + + QRect cr = contentsRect(); + lineNumberArea->setGeometry(QRect(cr.left(), cr.top(), lineNumberAreaWidth(), + cr.height())); +} + + + +void CodeEditor::highlightCurrentLine() +{ + QList<QTextEdit::ExtraSelection> extraSelections; + + if (!isReadOnly()) { + QTextEdit::ExtraSelection selection; + + QColor lineColor = QColor(Qt::yellow).lighter(160); + + selection.format.setBackground(lineColor); + selection.format.setProperty(QTextFormat::FullWidthSelection, true); + selection.cursor = textCursor(); + selection.cursor.clearSelection(); + extraSelections.append(selection); + } + + setExtraSelections(extraSelections); +} + +void CodeEditor::runningLine(int lineno) +{ + lineNumber = lineno; + repaint(); +} + +void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event) +{ + QPainter painter(lineNumberArea); + painter.fillRect(event->rect(), Qt::lightGray); + + + QTextBlock block = firstVisibleBlock(); + int blockNumber = block.blockNumber(); + int top = + (int) blockBoundingGeometry(block).translated(contentOffset()).top(); + int bottom = top + (int) blockBoundingRect(block).height(); + + while (block.isValid() && top <= event->rect().bottom()) { + if (block.isVisible() && bottom >= event->rect().top()) { + QString number = QString::number(blockNumber + 1); + if(blockNumber + 1 == lineNumber) painter.setPen(Qt::green); + else painter.setPen(Qt::black); + painter.drawText(0, top, lineNumberArea->width(), fontMetrics().height(), + Qt::AlignRight, number); + } + + block = block.next(); + top = bottom; + bottom = top + (int) blockBoundingRect(block).height(); + ++blockNumber; + } +} |