utils/themeeditor/codeeditor.cpp

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  10  * This file has been copied from Nokia's Qt Examples, with minor modifications
  11  * made available under the LGPL version 2.1, as the original file was licensed
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  13  ****************************************************************************
  14  ****************************************************************************
  15 **
  16 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  17 ** All rights reserved.
  18 ** Contact: Nokia Corporation (qt-info@nokia.com)
  19 **
  20 ** This file is part of the examples of the Qt Toolkit.
  21 **
  22 ** GNU Lesser General Public License Usage
  23 ** Alternatively, this file may be used under the terms of the GNU Lesser
  24 ** General Public License version 2.1 as published by the Free Software
  25 ** Foundation and appearing in the file LICENSE.LGPL included in the
  26 ** packaging of this file.  Please review the following information to
  27 ** ensure the GNU Lesser General Public License version 2.1 requirements
  28 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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  30 ** In addition, as a special exception, Nokia gives you certain additional
  31 ** rights.  These rights are described in the Nokia Qt LGPL Exception
  32 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
  33 **
  34 ****************************************************************************/
  35
  36 #include <QtGui>
  37
  38 #include "codeeditor.h"
  39
  40 //![constructor]
  41
  42 CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
  43 {
  44     lineNumberArea = new LineNumberArea(this);
  45
  46     connect(this, SIGNAL(blockCountChanged(int)),
  47             this, SLOT(updateLineNumberAreaWidth(int)));
  48     connect(this, SIGNAL(updateRequest(QRect,int)),
  49             this, SLOT(updateLineNumberArea(QRect,int)));
  50
  51     updateLineNumberAreaWidth(0);
  52 }
  53
  54 //![constructor]
  55
  56 //![extraAreaWidth]
  57
  58 int CodeEditor::lineNumberAreaWidth()
  59 {
  60     int digits = 1;
  61     int max = qMax(1, blockCount());
  62     while (max >= 10) {
  63         max /= 10;
  64         ++digits;
  65     }
  66
  67     int space = 3 + fontMetrics().width(QLatin1Char('9')) * digits;
  68
  69     return space;
  70 }
  71
  72 //![extraAreaWidth]
  73
  74 //![slotUpdateExtraAreaWidth]
  75
  76 void CodeEditor::updateLineNumberAreaWidth(int /* newBlockCount */)
  77 {
  78     setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
  79 }
  80
  81 //![slotUpdateExtraAreaWidth]
  82
  83 //![slotUpdateRequest]
  84
  85 void CodeEditor::updateLineNumberArea(const QRect &rect, int dy)
  86 {
  87     if (dy)
  88         lineNumberArea->scroll(0, dy);
  89     else
  90         lineNumberArea->update(0, rect.y(), lineNumberArea->width(), rect.height());
  91
  92     if (rect.contains(viewport()->rect()))
  93         updateLineNumberAreaWidth(0);
  94 }
  95
  96 //![slotUpdateRequest]
  97
  98 //![resizeEvent]
  99
 100 void CodeEditor::resizeEvent(QResizeEvent *e)
 101 {
 102     QPlainTextEdit::resizeEvent(e);
 103
 104     QRect cr = contentsRect();
 105     lineNumberArea->setGeometry(QRect(cr.left(), cr.top(),
 106                                       lineNumberAreaWidth(), cr.height()));
 107 }
 108
 109 //![resizeEvent]
 110
 111 //![extraAreaPaintEvent_0]
 112
 113 void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
 114 {
 115     QPainter painter(lineNumberArea);
 116     painter.fillRect(event->rect(), Qt::lightGray);
 117
 118 //![extraAreaPaintEvent_0]
 119
 120 //![extraAreaPaintEvent_1]
 121     QTextBlock block = firstVisibleBlock();
 122     int blockNumber = block.blockNumber();
 123     int top = (int) blockBoundingGeometry(block).translated(contentOffset()).top();
 124     int bottom = top + (int) blockBoundingRect(block).height();
 125 //![extraAreaPaintEvent_1]
 126
 127 //![extraAreaPaintEvent_2]
 128     while (block.isValid() && top <= event->rect().bottom()) {
 129         if (block.isVisible() && bottom >= event->rect().top()) {
 130             QString number = QString::number(blockNumber + 1);
 131             /* Drawing an error circle if necessary */
 132             if(errors.contains(blockNumber + 1))
 133             {
 134                 painter.fillRect(QRect(0, top, lineNumberArea->width(),
 135                                        fontMetrics().height()), errorColor);
 136             }
 137             painter.setPen(Qt::black);
 138             painter.drawText(0, top, lineNumberArea->width(),
 139                              fontMetrics().height(), Qt::AlignRight, number);
 140         }
 141
 142         block = block.next();
 143         top = bottom;
 144         bottom = top + (int) blockBoundingRect(block).height();
 145         ++blockNumber;
 146     }
 147 }
 148 //![extraAreaPaintEvent_2]
 149