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(Type type, 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
  44     m_comparatorBox = new QComboBox(this);
  45     m_comparatorBox->setSizeAdjustPolicy(QComboBox::AdjustToContents);
  46
  47     createDescriptions();
  48     const int index = static_cast<int>(type);
  49     m_descriptionsBox->setCurrentIndex(index);
  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     slotDescriptionChanged(index);
  69     connect(m_descriptionsBox, SIGNAL(currentIndexChanged(int)), this, SLOT(slotDescriptionChanged(int)));
  70 }
  71
  72 SearchCriterionSelector::~SearchCriterionSelector()
  73 {
  74 }
  75
  76 QString SearchCriterionSelector::queryString() const
  77 {
  78     if (m_valueWidget == 0) {
  79         return QString();
  80     }
  81
  82     const int descIndex = m_descriptionsBox->currentIndex();
  83     const SearchCriterionDescription& descr = m_descriptions[descIndex];
  84
  85     const int compIndex = m_comparatorBox->currentIndex();
  86     const SearchCriterionDescription::Comparator& comp = descr.comparators()[compIndex];
  87
  88     return comp.prefix + descr.identifier() + comp.operation +
  89            '"' + m_valueWidget->value() + '"';
  90 }
  91
  92 void SearchCriterionSelector::slotDescriptionChanged(int index)
  93 {
  94     if (m_valueWidget != 0) {
  95         m_valueWidget->hide();
  96         m_layout->removeWidget(m_valueWidget);
  97         m_valueWidget = 0;
  98         // the value widget is obtained by the Search Criterion
  99         // Selector instance and may not get deleted
 100     }
 101
 102     // add comparator items
 103     disconnect(m_comparatorBox, SIGNAL(currentIndexChanged(int)), this, SLOT(slotComparatorChanged(int)));
 104     m_comparatorBox->clear();
 105
 106     const SearchCriterionDescription& description = m_descriptions[index];
 107     foreach (const SearchCriterionDescription::Comparator& comp, description.comparators()) {
 108         m_comparatorBox->addItem(comp.name);
 109     }
 110
 111     // add value widget
 112     m_valueWidget = description.valueWidget();
 113     m_layout->insertWidget(2, m_valueWidget);
 114
 115     m_comparatorBox->setCurrentIndex(0);
 116     slotComparatorChanged(0);
 117     connect(m_comparatorBox, SIGNAL(currentIndexChanged(int)), this, SLOT(slotComparatorChanged(int)));
 118 }
 119
 120 void SearchCriterionSelector::slotComparatorChanged(int index)
 121 {
 122     Q_ASSERT(index >= 0);
 123
 124     // only show the value widget if an operation is defined by the comparator
 125     const int descIndex = m_descriptionsBox->currentIndex();
 126     const SearchCriterionDescription& descr = m_descriptions[descIndex];
 127     const SearchCriterionDescription::Comparator& comp = descr.comparators()[index];
 128     m_valueWidget->setVisible(!comp.operation.isEmpty());
 129
 130     emit criterionChanged();
 131 }
 132
 133 void SearchCriterionSelector::createDescriptions()
 134 {
 135     Q_ASSERT(m_descriptionsBox != 0);
 136     Q_ASSERT(m_comparatorBox != 0);
 137
 138     // TODO: maybe this creation should be forwarded to a factory if
 139     // the number of items increases in future
 140     QList<SearchCriterionDescription::Comparator> defaultComps;
 141     defaultComps.append(SearchCriterionDescription::Comparator(i18nc("@label", "Greater Than"), ">", "+"));
 142     defaultComps.append(SearchCriterionDescription::Comparator(i18nc("@label", "Greater Than or Equal to"), ">=", "+"));
 143     defaultComps.append(SearchCriterionDescription::Comparator(i18nc("@label", "Less Than"), "<", "+"));
 144     defaultComps.append(SearchCriterionDescription::Comparator(i18nc("@label", "Less Than or Equal to"), "<=", "+"));
 145
 146     // add "Date" description
 147     QList<SearchCriterionDescription::Comparator> dateComps;
 148     dateComps.append(SearchCriterionDescription::Comparator(i18nc("@label", "Anytime"))); // TODO
 149     dateComps.append(SearchCriterionDescription::Comparator(i18nc("@label", "Today"))); // TODO
 150     dateComps.append(SearchCriterionDescription::Comparator(i18nc("@label", "This week"))); // TODO
 151     dateComps.append(SearchCriterionDescription::Comparator(i18nc("@label", "This month"))); // TODO
 152     foreach (const SearchCriterionDescription::Comparator& comp, defaultComps) {
 153         dateComps.append(comp);
 154     }
 155
 156     DateValue* dateValue = new DateValue(this);
 157     dateValue->hide();
 158     SearchCriterionDescription date(i18nc("@label", "Date:"),
 159                                     "lastModified",
 160                                     dateComps,
 161                                     dateValue);
 162
 163     // add "Size" description
 164     QList<SearchCriterionDescription::Comparator> sizeComps = defaultComps;
 165     sizeComps.insert(0, SearchCriterionDescription::Comparator(i18nc("@label Any (file size)", "Any")));
 166
 167     SizeValue* sizeValue = new SizeValue(this);
 168     sizeValue->hide();
 169     SearchCriterionDescription size(i18nc("@label", "Size:"),
 170                                     "contentSize",
 171                                     sizeComps,
 172                                     sizeValue);
 173
 174     // add "Tag" description
 175     QList<SearchCriterionDescription::Comparator> tagComps;
 176     tagComps.append(SearchCriterionDescription::Comparator(i18nc("@label All (tags)", "All")));
 177     tagComps.append(SearchCriterionDescription::Comparator(i18nc("@label", "Equal to"), ":"));
 178
 179     TagValue* tagValue = new TagValue(this);
 180     tagValue->hide();
 181     SearchCriterionDescription tag(i18nc("@label", "Tag:"),
 182                                    "tag",
 183                                    tagComps,
 184                                    tagValue);
 185
 186     Q_ASSERT(static_cast<int>(SearchCriterionSelector::Date) == 0);
 187     Q_ASSERT(static_cast<int>(SearchCriterionSelector::Size) == 1);
 188     Q_ASSERT(static_cast<int>(SearchCriterionSelector::Tag) == 2);
 189     m_descriptions.append(date);
 190     m_descriptions.append(size);
 191     m_descriptions.append(tag);
 192
 193     // add all descriptions to the combo box and connect the value widgets
 194     int i = 0;
 195     foreach (const SearchCriterionDescription& desc, m_descriptions) {
 196         m_descriptionsBox->addItem(desc.name(), i);
 197         connect(desc.valueWidget(), SIGNAL(valueChanged(QString)), this, SIGNAL(criterionChanged()));
 198         ++i;
 199     }
 200 }
 201
 202 #include "searchcriterionselector.moc"