editors/sc-ide/widgets/code_editor/overlay.cpp

   1 /*
   2     SuperCollider Qt IDE
   3     Copyright (c) 2012 Jakob Leben & Tim Blechmann
   4     http://www.audiosynth.com
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  19 */
  20
  21 #include "overlay.hpp"
  22 #include "editor.hpp"
  23 #include "../../core/main.hpp"
  24
  25 #include <QTextDocument>
  26 #include <QTextLayout>
  27 #include <QTextBlock>
  28 #include <QPainter>
  29 #include <QPropertyAnimation>
  30 #include <QtCore/qmath.h>
  31 #include <QDebug>
  32
  33 namespace ScIDE {
  34
  35 void CodeEditor::blinkCode( const QTextCursor & c )
  36 {
  37     if( !c.document() || !c.hasSelection() ) return;
  38
  39     Settings::Manager *settings = Main::settings();
  40     settings->beginGroup("IDE/editor/colors");
  41     QTextCharFormat evalCodeTextFormat = settings->value("evaluatedCode").value<QTextCharFormat>();
  42     settings->endGroup();
  43
  44     QTextDocument *doc = c.document();
  45
  46     int startPos = c.selectionStart();
  47     int endPos = c.selectionEnd();
  48     QTextBlock startBlock = doc->findBlock(startPos);
  49     QTextBlock endBlock = doc->findBlock(endPos);
  50     startPos -= startBlock.position();
  51     endPos -= endBlock.position();
  52
  53     // Get the bounds of visible blocks within the cursor's selection:
  54
  55     QTextBlock b = firstVisibleBlock();
  56     int idx = b.blockNumber();
  57     int sidx = startBlock.blockNumber();
  58
  59     QTextBlock firstBlock, lastBlock;
  60     firstBlock = lastBlock = b;
  61
  62     QRectF geom = blockBoundingGeometry(b).translated(contentOffset());
  63     qreal top = geom.top();
  64     qreal bottom = top;
  65     qreal width=0;
  66
  67     while(b.isValid() && bottom < viewport()->rect().height())
  68     {
  69         if(b.isVisible())
  70         {
  71             QTextLayout *l = b.layout();
  72             QRectF r = l->boundingRect();
  73             bottom += r.height();
  74             if(idx < sidx) {
  75                 // Block not within the selection. Will skip it.
  76                 top = bottom;
  77             }
  78             else {
  79                 // Block within the selection.
  80                 width = qMax(width, l->maximumWidth() + r.left());
  81             }
  82         }
  83
  84         if(b == endBlock) break;
  85
  86         b = b.next();
  87         ++idx;
  88         if(top == bottom)
  89             firstBlock = b;
  90     }
  91
  92     lastBlock = b;
  93
  94     if(bottom == top) {
  95         //qDebug("no visible block.");
  96         return;
  97     }
  98
  99     // Construct a pixmap to render the code on:
 100
 101     QPixmap pix( QSize(qCeil(width), qCeil(bottom - top)) );
 102     pix.fill(QColor(0,0,0,0));
 103
 104     // Render the visible blocks:
 105
 106     QPainter painter(&pix);
 107     QVector<QTextLayout::FormatRange> selections;
 108     b = firstBlock;
 109     int y=0;
 110     while(true)
 111     {
 112         QRectF r = b.layout()->boundingRect();
 113
 114         // Use extra char formatting to hide code outside of selection
 115         // and modify the appearance of selected code:
 116
 117         QTextLayout::FormatRange range;
 118         selections.clear();
 119
 120         int start = 0;
 121         if(b == startBlock) {
 122             range.start = 0;
 123             range.length = startPos;
 124             range.format.setForeground(QColor(0,0,0,0));
 125             range.format.setBackground(Qt::NoBrush);
 126             selections.append(range);
 127             start = startPos;
 128         }
 129
 130         range.start = start;
 131         range.length = (b == endBlock ? endPos : b.length() - 1) - range.start;
 132         range.format = evalCodeTextFormat;
 133         selections.append(range);
 134
 135         if(b == endBlock) {
 136             range.start = range.start + range.length;
 137             range.length = b.length() - 1 - range.start;
 138             range.format.setForeground(QColor(0,0,0,0));
 139             range.format.setBackground(Qt::NoBrush);
 140             selections.append(range);
 141         }
 142
 143         b.layout()->draw(&painter, QPointF(0,y), selections);
 144
 145         if(b == lastBlock) break;
 146
 147         y += r.height();
 148
 149         b = b.next();
 150     }
 151
 152     // Create an overlay item to display the pixmap, and animate it:
 153
 154     CodeFragmentOverlay *item = new CodeFragmentOverlay();
 155     item->setPixmap(pix);
 156     item->setPos(geom.left(), top);
 157
 158     mOverlay->addItem(item);
 159
 160     QPropertyAnimation *anim = new QPropertyAnimation(item, "opacity", item);
 161     anim->setDuration(mBlinkDuration);
 162     anim->setStartValue(1.0);
 163     anim->setEndValue(0.0);
 164     anim->setEasingCurve( QEasingCurve::InCubic );
 165     anim->start();
 166
 167     connect(anim, SIGNAL(finished()), item, SLOT(deleteLater()));
 168 }
 169
 170 } // namespace ScIDE