editors/sc-ide/widgets/cmd_line.cpp

   1 /*
   2     SuperCollider Qt IDE
   3     Copyright (c) 2010-2012 Jakob Leben
   4     Copyright (c) 2012 Tim Blechmann
   5     http://www.audiosynth.com
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  20 */
  21
  22 #include "cmd_line.hpp"
  23
  24 #include <QHBoxLayout>
  25 #include <QLabel>
  26 #include <QKeyEvent>
  27
  28 namespace ScIDE {
  29
  30 CmdLine::CmdLine( const QString &text, int maxHist ) :
  31     curHistory( -1 ),
  32     maxHistory( qMax(1,maxHist) )
  33 {
  34     QLabel *lbl = new QLabel(text);
  35
  36     expr = new QLineEdit;
  37     QFont f( expr->font() );
  38     f.setFamily("monospace");
  39     f.setStyleHint(QFont::TypeWriter);
  40     expr->setFont(f);
  41
  42     QHBoxLayout *l = new QHBoxLayout;
  43     l->setContentsMargins(0,0,0,0);
  44     l->addWidget(lbl);
  45     l->addWidget(expr);
  46     setLayout( l );
  47
  48     expr->installEventFilter( this );
  49     setFocusProxy(expr);
  50 }
  51
  52 bool CmdLine::eventFilter( QObject *, QEvent *e )
  53 {
  54     int type = e->type();
  55     if( type != QEvent::KeyPress ) return false;
  56
  57     QKeyEvent *ke = static_cast<QKeyEvent*>(e);
  58
  59     switch( ke->key() )
  60     {
  61     case Qt::Key_Return:
  62     case Qt::Key_Enter:
  63
  64         if( expr->text().isEmpty() ) return true;
  65
  66         emit invoked( expr->text(), false );
  67         if( history.count() == 0 || history[0] != expr->text() )
  68         {
  69             if( history.count() >= maxHistory ) history.removeAt( history.count() - 1 );
  70             history.prepend( expr->text() );
  71         }
  72         curHistory = -1;
  73         expr->clear();
  74         return true;
  75
  76     case Qt::Key_Up:
  77         if( curHistory < history.count() - 1 ) {
  78             expr->blockSignals(true);
  79             expr->setText( history[++curHistory] );
  80             expr->blockSignals(false);
  81         }
  82         return true;
  83
  84     case Qt::Key_Down:
  85         if( curHistory > -1 ) {
  86             --curHistory;
  87             expr->blockSignals(true);
  88             if( curHistory == -1 ) expr->clear();
  89             else expr->setText( history[curHistory] );
  90             expr->blockSignals(false);
  91         }
  92         return true;
  93
  94         default: return false;
  95     }
  96 }
  97
  98 } // namespace ScIDE