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# window.cpp Example File

itemviews/basicsortfiltermodel/window.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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     #include <QtGui>

     #include "window.h"

     Window::Window()
     {
         proxyModel = new QSortFilterProxyModel;
         proxyModel->setDynamicSortFilter(true);

         sourceView = new QTreeView;
         sourceView->setRootIsDecorated(false);
         sourceView->setAlternatingRowColors(true);

         proxyView = new QTreeView;
         proxyView->setRootIsDecorated(false);
         proxyView->setAlternatingRowColors(true);
         proxyView->setModel(proxyModel);
         proxyView->setSortingEnabled(true);

         sortCaseSensitivityCheckBox = new QCheckBox(tr("Case sensitive sorting"));
         filterCaseSensitivityCheckBox = new QCheckBox(tr("Case sensitive filter"));

         filterPatternLineEdit = new QLineEdit;
         filterPatternLabel = new QLabel(tr("&Filter pattern:"));
         filterPatternLabel->setBuddy(filterPatternLineEdit);

         filterSyntaxComboBox = new QComboBox;
         filterSyntaxComboBox->addItem(tr("Regular expression"), QRegExp::RegExp);
         filterSyntaxComboBox->addItem(tr("Wildcard"), QRegExp::Wildcard);
         filterSyntaxComboBox->addItem(tr("Fixed string"), QRegExp::FixedString);
         filterSyntaxLabel = new QLabel(tr("Filter &syntax:"));
         filterSyntaxLabel->setBuddy(filterSyntaxComboBox);

         filterColumnComboBox = new QComboBox;
         filterColumnComboBox->addItem(tr("Subject"));
         filterColumnComboBox->addItem(tr("Sender"));
         filterColumnComboBox->addItem(tr("Date"));
         filterColumnLabel = new QLabel(tr("Filter &column:"));
         filterColumnLabel->setBuddy(filterColumnComboBox);

         connect(filterPatternLineEdit, SIGNAL(textChanged(QString)),
                 this, SLOT(filterRegExpChanged()));
         connect(filterSyntaxComboBox, SIGNAL(currentIndexChanged(int)),
                 this, SLOT(filterRegExpChanged()));
         connect(filterColumnComboBox, SIGNAL(currentIndexChanged(int)),
                 this, SLOT(filterColumnChanged()));
         connect(filterCaseSensitivityCheckBox, SIGNAL(toggled(bool)),
                 this, SLOT(filterRegExpChanged()));
         connect(sortCaseSensitivityCheckBox, SIGNAL(toggled(bool)),
                 this, SLOT(sortChanged()));

     #if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)
         sourceWidget = new QWidget;
         filterWidget = new QWidget;
         proxyWidget = new QWidget;

         QHBoxLayout *sourceLayout = new QHBoxLayout;
         sourceLayout->addWidget(sourceView);
         sourceWidget->setLayout(sourceLayout);

         QGridLayout *filterLayout = new QGridLayout;
         filterLayout->addWidget(filterPatternLabel, 1, 0);
         filterLayout->addWidget(filterPatternLineEdit, 1, 1, 1, 2);
         filterLayout->addWidget(filterSyntaxLabel, 2, 0);
         filterLayout->addWidget(filterSyntaxComboBox, 2, 1, 1, 2);
         filterLayout->addWidget(filterColumnLabel, 3, 0);
         filterLayout->addWidget(filterColumnComboBox, 3, 1, 1, 2);
         filterLayout->addWidget(filterCaseSensitivityCheckBox, 4, 0, 1, 2);
         filterLayout->addWidget(sortCaseSensitivityCheckBox, 4, 2);
         filterWidget->setLayout(filterLayout);

         QHBoxLayout *proxyLayout = new QHBoxLayout;
         proxyLayout->addWidget(proxyView);
         proxyWidget->setLayout(proxyLayout);

         QVBoxLayout *mainLayout = new QVBoxLayout;

         QTabWidget *tabWidget = new QTabWidget;
         tabWidget->addTab(sourceWidget, "Source");
         tabWidget->addTab(filterWidget, "Filters");
         tabWidget->addTab(proxyWidget, "Proxy");
         mainLayout->addWidget(tabWidget);
     #else
         sourceGroupBox = new QGroupBox(tr("Original Model"));
         proxyGroupBox = new QGroupBox(tr("Sorted/Filtered Model"));

         QHBoxLayout *sourceLayout = new QHBoxLayout;
         sourceLayout->addWidget(sourceView);
         sourceGroupBox->setLayout(sourceLayout);

         QGridLayout *proxyLayout = new QGridLayout;
         proxyLayout->addWidget(proxyView, 0, 0, 1, 3);
         proxyLayout->addWidget(filterPatternLabel, 1, 0);
         proxyLayout->addWidget(filterPatternLineEdit, 1, 1, 1, 2);
         proxyLayout->addWidget(filterSyntaxLabel, 2, 0);
         proxyLayout->addWidget(filterSyntaxComboBox, 2, 1, 1, 2);
         proxyLayout->addWidget(filterColumnLabel, 3, 0);
         proxyLayout->addWidget(filterColumnComboBox, 3, 1, 1, 2);
         proxyLayout->addWidget(filterCaseSensitivityCheckBox, 4, 0, 1, 2);
         proxyLayout->addWidget(sortCaseSensitivityCheckBox, 4, 2);
         proxyGroupBox->setLayout(proxyLayout);

         QVBoxLayout *mainLayout = new QVBoxLayout;

         mainLayout->addWidget(sourceGroupBox);
         mainLayout->addWidget(proxyGroupBox);
     #endif

         setLayout(mainLayout);

         setWindowTitle(tr("Basic Sort/Filter Model"));
         resize(500, 450);

         proxyView->sortByColumn(1, Qt::AscendingOrder);
         filterColumnComboBox->setCurrentIndex(1);

         filterPatternLineEdit->setText("Andy|Grace");
         filterCaseSensitivityCheckBox->setChecked(true);
         sortCaseSensitivityCheckBox->setChecked(true);
     }

     void Window::setSourceModel(QAbstractItemModel *model)
     {
         proxyModel->setSourceModel(model);
         sourceView->setModel(model);
     }

     void Window::filterRegExpChanged()
     {
         QRegExp::PatternSyntax syntax =
                 QRegExp::PatternSyntax(filterSyntaxComboBox->itemData(
                         filterSyntaxComboBox->currentIndex()).toInt());
         Qt::CaseSensitivity caseSensitivity =
                 filterCaseSensitivityCheckBox->isChecked() ? Qt::CaseSensitive
                                                            : Qt::CaseInsensitive;

         QRegExp regExp(filterPatternLineEdit->text(), caseSensitivity, syntax);
         proxyModel->setFilterRegExp(regExp);
     }

     void Window::filterColumnChanged()
     {
         proxyModel->setFilterKeyColumn(filterColumnComboBox->currentIndex());
     }

     void Window::sortChanged()
     {
         proxyModel->setSortCaseSensitivity(
                 sortCaseSensitivityCheckBox->isChecked() ? Qt::CaseSensitive
                                                          : Qt::CaseInsensitive);
     }