editable_combo_box.cpp
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00001 /*
00002  * Copyright (c) 2012, Willow Garage, Inc.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions are met:
00007  *
00008  *     * Redistributions of source code must retain the above copyright
00009  *       notice, this list of conditions and the following disclaimer.
00010  *     * Redistributions in binary form must reproduce the above copyright
00011  *       notice, this list of conditions and the following disclaimer in the
00012  *       documentation and/or other materials provided with the distribution.
00013  *     * Neither the name of the Willow Garage, Inc. nor the names of its
00014  *       contributors may be used to endorse or promote products derived from
00015  *       this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00018  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
00021  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00022  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
00023  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00024  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00025  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00026  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00027  * POSSIBILITY OF SUCH DAMAGE.
00028  */
00029 
00030 #include <stdio.h>
00031 
00032 #include <QCompleter>
00033 #include <QKeyEvent>
00034 #include <QLineEdit>
00035 
00036 #include "rviz/properties/editable_combo_box.h"
00037 
00038 namespace rviz
00039 {
00040 
00041 EditableComboBox::EditableComboBox( QWidget* parent )
00042   : ComboBox( parent )
00043 {
00044   setEditable( true );
00045   completer()->setCompletionMode( QCompleter::PopupCompletion );
00046   completer()->setCaseSensitivity( Qt::CaseInsensitive );
00047 }
00048 
00049 QString findMaxCommonPrefix( const QStringList& strings )
00050 {
00051   if( strings.size() == 0 )
00052   {
00053     return "";
00054   }
00055   if( strings.size() == 1 )
00056   {
00057     return strings[ 0 ];
00058   }
00059   QString common_prefix;
00060   int char_index = 0;
00061 
00062   // loop over character index
00063   while( true )
00064   {
00065     if( char_index >= strings[ 0 ].size() )
00066     {
00067       return common_prefix;
00068     }
00069     const QChar c = strings[ 0 ][ char_index ];
00070 
00071     // loop over strings
00072     for( int string_index = 1; string_index < strings.size(); string_index++ )
00073     {
00074       const QString& str = strings[ string_index ];
00075       if( char_index >= str.size() ||
00076           str[ char_index ] != c )
00077       {
00078         return common_prefix;
00079       }
00080     }
00081     common_prefix += c;
00082     char_index++;
00083   }
00084   return ""; // just to satisfy compiler... I know it will never reach this.
00085 }
00086 
00087 bool EditableComboBox::event( QEvent* event )
00088 {
00089   if( event->type() == QEvent::KeyPress )
00090   {                                                                                                          
00091     QKeyEvent* k = (QKeyEvent*) event;
00092     if( k->key() == Qt::Key_Tab && k->modifiers() == Qt::NoModifier )
00093     {
00094       QCompleter* comp = completer();
00095 
00096       QStringList completions;
00097       for( int i = 0; comp->setCurrentRow( i ); i++ )
00098       {
00099         completions.push_back( comp->currentCompletion() );
00100       }
00101       QString max_common_prefix = findMaxCommonPrefix( completions );
00102       if( max_common_prefix.size() > currentText().size() )
00103       {
00104         setEditText( max_common_prefix );
00105         lineEdit()->setCursorPosition( max_common_prefix.size() );
00106       }
00107 
00108       event->accept();
00109       return true;
00110     }
00111   }
00112   return ComboBox::event( event );
00113 }
00114 
00115 } // end namespace rviz


rviz
Author(s): Dave Hershberger, David Gossow, Josh Faust
autogenerated on Mon Oct 6 2014 07:26:35