utils/wpseditor/gui/src/numberedtextview.cpp

   1 /* This file is part of the KDE libraries
   2     Copyright (C) 2005, 2006 KJSEmbed Authors
   3     See included AUTHORS file.
   4
   5     This library is free software; you can redistribute it and/or
   6     modify it under the terms of the GNU Library General Public
   7     License as published by the Free Software Foundation; either
   8     version 2 of the License, or (at your option) any later version.
   9
  10     This library is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13     Library General Public License for more details.
  14
  15     You should have received a copy of the GNU Library General Public License
  16     along with this library; see the file COPYING.LIB.  If not, write to
  17     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18     Boston, MA 02110-1301, USA.
  19
  20
  21     --------------------------------------------------------------------------------------
  22     Imported into the WPS editor and simplified by Dominik Wenger
  23
  24 */
  25
  26
  27 #include <QTextDocument>
  28 #include <QTextBlock>
  29 #include <QTextEdit>
  30 #include <QHBoxLayout>
  31 #include <QScrollBar>
  32 #include <QPainter>
  33 #include <QAbstractTextDocumentLayout>
  34 #include <QDebug>
  35
  36 #include "numberedtextview.h"
  37
  38 NumberBar::NumberBar( QWidget *parent )
  39     : QWidget( parent ), edit(0), markedLine(-1)
  40 {
  41     // Make room for 4 digits and the breakpoint icon
  42     setFixedWidth( fontMetrics().width( QString("0000") + 10 + 32 ) );
  43     markerIcon = QPixmap( "images/marker.png" );
  44 }
  45
  46 NumberBar::~NumberBar()
  47 {
  48 }
  49
  50
  51 void NumberBar::markLine( int lineno )
  52 {
  53     markedLine = lineno;
  54 }
  55
  56 void NumberBar::setTextEdit( QTextEdit *edit )
  57 {
  58     this->edit = edit;
  59     connect( edit->document()->documentLayout(), SIGNAL( update(const QRectF &) ),
  60              this, SLOT( update() ) );
  61     connect( edit->verticalScrollBar(), SIGNAL(valueChanged(int) ),
  62              this, SLOT( update() ) );
  63 }
  64
  65 void NumberBar::paintEvent( QPaintEvent * )
  66 {
  67     QAbstractTextDocumentLayout *layout = edit->document()->documentLayout();
  68     int contentsY = edit->verticalScrollBar()->value();
  69     qreal pageBottom = contentsY + edit->viewport()->height();
  70     const QFontMetrics fm = fontMetrics();
  71     const int ascent = fontMetrics().ascent() + 1; // height = ascent + descent + 1
  72     int lineCount = 1;
  73
  74     QPainter p(this);
  75
  76     markedRect = QRect();
  77
  78     for ( QTextBlock block = edit->document()->begin();
  79           block.isValid(); block = block.next(), ++lineCount )
  80     {
  81
  82         const QRectF boundingRect = layout->blockBoundingRect( block );
  83
  84         QPointF position = boundingRect.topLeft();
  85         if ( position.y() + boundingRect.height() < contentsY )
  86             continue;
  87         if ( position.y() > pageBottom )
  88             break;
  89
  90         const QString txt = QString::number( lineCount );
  91         p.drawText( width() - fm.width(txt), qRound( position.y() ) - contentsY + ascent, txt );
  92
  93         // marker
  94         if ( markedLine == lineCount )
  95         {
  96             p.drawPixmap( 1, qRound( position.y() ) - contentsY, markerIcon );
  97             markedRect = QRect( 1, qRound( position.y() ) - contentsY, markerIcon.width(), markerIcon.height() );
  98         }
  99     }
 100 }
 101
 102 NumberedTextView::NumberedTextView( QWidget *parent )
 103     : QFrame( parent )
 104 {
 105     setFrameStyle( QFrame::StyledPanel | QFrame::Sunken );
 106     setLineWidth( 2 );
 107
 108     // Setup the main view
 109     view = new QTextEdit( this );
 110     //view->setFontFamily( "Courier" );
 111     view->setLineWrapMode( QTextEdit::NoWrap );
 112     view->setFrameStyle( QFrame::NoFrame );
 113
 114     connect( view->document(), SIGNAL(contentsChange(int,int,int)), this, SLOT(textChanged(int,int,int)) );
 115
 116     // Setup the line number pane
 117     numbers = new NumberBar( this );
 118     numbers->setTextEdit( view );
 119
 120     // Test
 121     markLine(2);
 122
 123     //setup layout
 124     box = new QHBoxLayout( this );
 125     box->setSpacing( 0 );
 126     box->setMargin( 0 );
 127     box->addWidget( numbers );
 128     box->addWidget( view );
 129 }
 130
 131 NumberedTextView::~NumberedTextView()
 132 {
 133 }
 134
 135 void NumberedTextView::markLine( int lineno )
 136 {
 137     markedLine = lineno;
 138     numbers->markLine( lineno );
 139     textChanged(1,1,1);
 140 }
 141
 142 void NumberedTextView::scrolltoLine( int lineno )
 143 {
 144     int max = view->verticalScrollBar()->maximum();
 145     int min = view->verticalScrollBar()->minimum();
 146     int lines = view->document()->blockCount();
 147     view->verticalScrollBar()->setValue( (max*lineno)/lines+min );
 148 }
 149
 150 void NumberedTextView::textChanged( int pos, int removed, int added )
 151 {
 152     Q_UNUSED( pos );
 153
 154     if ( removed == 0 && added == 0 )
 155         return;
 156
 157     QTextBlock block = highlight.block();
 158     QTextBlockFormat fmt = block.blockFormat();
 159     QColor bg = view->palette().base().color();
 160     fmt.setBackground( bg );
 161     highlight.setBlockFormat( fmt );
 162
 163     int lineCount = 1;
 164     for ( QTextBlock block = view->document()->begin();
 165           block.isValid(); block = block.next(), ++lineCount )
 166     {
 167         if ( lineCount == markedLine )
 168         {
 169             fmt = block.blockFormat();
 170             QColor bg = Qt::red;
 171             fmt.setBackground( bg.light(150) );
 172
 173             highlight = QTextCursor( block );
 174             highlight.movePosition( QTextCursor::EndOfBlock, QTextCursor::KeepAnchor );
 175             highlight.setBlockFormat( fmt );
 176
 177             break;
 178         }
 179     }
 180 }
 181