src/search/searchcriterionselector.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2009 by Adam Kidder <thekidder@gmail.com>               *
   3  *   Copyright (C) 2009 by Peter Penz <peter.penz@gmx.at>                  *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program 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         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  19  ***************************************************************************/
  20
  21 #include "searchcriterionselector.h"
  22
  23 #include "searchcriterionvalue.h"
  24
  25 #include <QComboBox>
  26 #include <QHBoxLayout>
  27 #include <QList>
  28 #include <QPushButton>
  29
  30 #include <kicon.h>
  31 #include <klocale.h>
  32
  33 SearchCriterionSelector::SearchCriterionSelector(QWidget* parent) :
  34     QWidget(parent),
  35     m_layout(0),
  36     m_descriptionsBox(0),
  37     m_comparatorBox(0),
  38     m_valueWidget(0),
  39     m_removeButton(0),
  40     m_descriptions()
  41 {
  42     m_descriptionsBox = new QComboBox(this);
  43     m_descriptionsBox->addItem(i18nc("@label", "Select..."), -1);
  44     createDescriptions();
  45     connect(m_descriptionsBox, SIGNAL(currentIndexChanged(int)), this, SLOT(slotDescriptionChanged(int)));
  46
  47     m_comparatorBox = new QComboBox(this);
  48     m_comparatorBox->hide();
  49     connect(m_comparatorBox, SIGNAL(currentIndexChanged(int)), this, SLOT(updateQuery()));
  50
  51     QWidget* filler = new QWidget(this);
  52     filler->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
  53
  54     m_removeButton = new QPushButton(this);
  55     m_removeButton->setIcon(KIcon("list-remove"));
  56     m_removeButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
  57     connect(m_removeButton, SIGNAL(clicked()), this, SIGNAL(removeCriterion()));
  58
  59     m_layout = new QHBoxLayout(this);
  60     m_layout->setMargin(0);
  61     m_layout->addWidget(m_descriptionsBox);
  62     m_layout->addWidget(m_comparatorBox);
  63     m_layout->addWidget(filler);
  64     m_layout->addWidget(m_removeButton);
  65
  66     setLayout(m_layout);
  67 }
  68
  69 SearchCriterionSelector::~SearchCriterionSelector()
  70 {
  71 }
  72
  73 void SearchCriterionSelector::createDescriptions()
  74 {
  75     // TODO: maybe this creation should be forwarded to a factory if
  76     // the number of items increases in future
  77
  78     QList<SearchCriterionDescription::Comparator> comparators;
  79     comparators.append(SearchCriterionDescription::Comparator(i18nc("@label", "greater than"), ">", "+"));
  80     comparators.append(SearchCriterionDescription::Comparator(i18nc("@label", "greater than or equal to"), ">=", "+"));
  81     comparators.append(SearchCriterionDescription::Comparator(i18nc("@label", "less than"), "<", "+"));
  82     comparators.append(SearchCriterionDescription::Comparator(i18nc("@label", "less than or equal to"), "<=", "+"));
  83
  84     // add "Date" description
  85     DateValue* dateValue = new DateValue(this);
  86     dateValue->hide();
  87     SearchCriterionDescription date(i18nc("@label", "Date Modified"),
  88                                     "sourceModified",
  89                                     comparators,
  90                                     dateValue);
  91
  92     // add "File Size" description
  93     FileSizeValue* fileSizeValue = new FileSizeValue(this);
  94     fileSizeValue->hide();
  95     SearchCriterionDescription size(i18nc("@label", "File Size"),
  96                                     "contentSize",
  97                                     comparators,
  98                                     fileSizeValue);
  99
 100     m_descriptions.append(date);
 101     m_descriptions.append(size);
 102
 103     // add all descriptions to the combo box
 104     const int count = m_descriptions.count();
 105     for (int i = 0; i < count; ++i) {
 106         m_descriptionsBox->addItem(m_descriptions[i].name(), i);
 107     }
 108 }
 109
 110 void SearchCriterionSelector::slotDescriptionChanged(int index)
 111 {
 112     m_comparatorBox->clear();
 113     m_comparatorBox->show();
 114     if (m_valueWidget != 0) {
 115         m_layout->removeWidget(m_valueWidget);
 116         // the value widget is obtained by the Search Criterion
 117         // Selector instance and may not get deleted
 118     }
 119
 120     // adjust the comparator box and the value widget dependent from the selected description
 121     m_comparatorBox->addItem(i18nc("@label", "Select..."), -1);
 122     const int descrIndex = m_descriptionsBox->itemData(index).toInt();
 123     if (descrIndex >= 0) {
 124         // add comparator items
 125         const SearchCriterionDescription& description = m_descriptions[descrIndex];
 126         foreach (const SearchCriterionDescription::Comparator& comp, description.comparators()) {
 127             m_comparatorBox->addItem(comp.name);
 128         }
 129
 130         // add value widget
 131         m_valueWidget = description.valueWidget();
 132         const int layoutIndex = m_layout->count() - 2;
 133         m_layout->insertWidget(layoutIndex, m_valueWidget);
 134         m_valueWidget->show();
 135     }
 136 }
 137
 138 void SearchCriterionSelector::updateQuery()
 139 {
 140     const SearchCriterionDescription* descr = description();
 141     if (descr == 0) {
 142         // no description has been selected
 143         return;
 144     }
 145
 146     // get selected comparator related to the description
 147     const int compBoxIndex = m_comparatorBox->currentIndex();
 148     const int compIndex = m_comparatorBox->itemData(compBoxIndex).toInt();
 149     if (compIndex < 0) {
 150         // no comparator has been selected
 151         return;
 152     }
 153
 154     // create query string
 155     const SearchCriterionDescription::Comparator& comp = descr->comparators()[compIndex];
 156     const QString queryString = comp.prefix + descr->identifier() + comp.operation + m_valueWidget->value();
 157     emit criterionChanged(queryString);
 158 }
 159
 160 const SearchCriterionDescription* SearchCriterionSelector::description() const
 161 {
 162     const int descrBoxIndex = m_descriptionsBox->currentIndex();
 163     const int descrIndex = m_descriptionsBox->itemData(descrBoxIndex).toInt();
 164     return (descrIndex < 0) ? 0 : &m_descriptions[descrIndex];
 165 }
 166
 167 #include "searchcriterionselector.moc"