Qt 4.0: dialog.cpp Example File (dialogs/standarddialogs/dialog.cpp)

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# dialog.cpp Example File
dialogs/standarddialogs/dialog.cpp

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        ** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
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    ** review the following information:
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        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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        #include <QtGui>

        #include "dialog.h"

        #define MESSAGE \
            Dialog::tr("<p>Message boxes have a caption, a text, " \
                       "and up to three buttons, each with standard or custom texts." \
                       "<p>Click a button or press Esc.")

        Dialog::Dialog(QWidget *parent)
            : QDialog(parent)
        {
            errorMessageDialog = new QErrorMessage(this);

            int frameStyle = QFrame::Sunken | QFrame::Panel;

            integerLabel = new QLabel;
            integerLabel->setFrameStyle(frameStyle);
            QPushButton *integerButton =
                    new QPushButton(tr("QInputDialog::get&Integer()"));

            doubleLabel = new QLabel;
            doubleLabel->setFrameStyle(frameStyle);
            QPushButton *doubleButton =
                    new QPushButton(tr("QInputDialog::get&Double()"));

            itemLabel = new QLabel;
            itemLabel->setFrameStyle(frameStyle);
            QPushButton *itemButton = new QPushButton(tr("QInputDialog::getIte&m()"));

            textLabel = new QLabel;
            textLabel->setFrameStyle(frameStyle);
            QPushButton *textButton = new QPushButton(tr("QInputDialog::get&Text()"));

            colorLabel = new QLabel;
            colorLabel->setFrameStyle(frameStyle);
            QPushButton *colorButton = new QPushButton(tr("QColorDialog::get&Color()"));

            fontLabel = new QLabel;
            fontLabel->setFrameStyle(frameStyle);
            QPushButton *fontButton = new QPushButton(tr("QFontDialog::get&Font()"));

            directoryLabel = new QLabel;
            directoryLabel->setFrameStyle(frameStyle);
            QPushButton *directoryButton =
                    new QPushButton(tr("QFileDialog::getE&xistingDirectory()"));

            openFileNameLabel = new QLabel;
            openFileNameLabel->setFrameStyle(frameStyle);
            QPushButton *openFileNameButton =
                    new QPushButton(tr("QFileDialog::get&OpenFileName()"));

            openFileNamesLabel = new QLabel;
            openFileNamesLabel->setFrameStyle(frameStyle);
            QPushButton *openFileNamesButton =
                    new QPushButton(tr("QFileDialog::&getOpenFileNames()"));

            saveFileNameLabel = new QLabel;
            saveFileNameLabel->setFrameStyle(frameStyle);
            QPushButton *saveFileNameButton =
                    new QPushButton(tr("QFileDialog::get&SaveFileName()"));

            criticalLabel = new QLabel;
            criticalLabel->setFrameStyle(frameStyle);
            QPushButton *criticalButton =
                    new QPushButton(tr("QMessageBox::critica&l()"));

            informationLabel = new QLabel;
            informationLabel->setFrameStyle(frameStyle);
            QPushButton *informationButton =
                    new QPushButton(tr("QMessageBox::i&nformation()"));

            questionLabel = new QLabel;
            questionLabel->setFrameStyle(frameStyle);
            QPushButton *questionButton =
                    new QPushButton(tr("QMessageBox::&question()"));

            warningLabel = new QLabel;
            warningLabel->setFrameStyle(frameStyle);
            QPushButton *warningButton = new QPushButton(tr("QMessageBox::&warning()"));

            errorLabel = new QLabel;
            errorLabel->setFrameStyle(frameStyle);
            QPushButton *errorButton =
                    new QPushButton(tr("QErrorMessage::show&M&essage()"));

            connect(integerButton, SIGNAL(clicked()), this, SLOT(setInteger()));
            connect(doubleButton, SIGNAL(clicked()), this, SLOT(setDouble()));
            connect(itemButton, SIGNAL(clicked()), this, SLOT(setItem()));
            connect(textButton, SIGNAL(clicked()), this, SLOT(setText()));
            connect(colorButton, SIGNAL(clicked()), this, SLOT(setColor()));
            connect(fontButton, SIGNAL(clicked()), this, SLOT(setFont()));
            connect(directoryButton, SIGNAL(clicked()),
                    this, SLOT(setExistingDirectory()));
            connect(openFileNameButton, SIGNAL(clicked()),
                    this, SLOT(setOpenFileName()));
            connect(openFileNamesButton, SIGNAL(clicked()),
                    this, SLOT(setOpenFileNames()));
            connect(saveFileNameButton, SIGNAL(clicked()),
                    this, SLOT(setSaveFileName()));
            connect(criticalButton, SIGNAL(clicked()), this, SLOT(criticalMessage()));
            connect(informationButton, SIGNAL(clicked()),
                    this, SLOT(informationMessage()));
            connect(questionButton, SIGNAL(clicked()), this, SLOT(questionMessage()));
            connect(warningButton, SIGNAL(clicked()), this, SLOT(warningMessage()));
            connect(errorButton, SIGNAL(clicked()), this, SLOT(errorMessage()));

            QGridLayout *layout = new QGridLayout;
            layout->setColumnStretch(1, 1);
            layout->setColumnMinimumWidth(1, 250);
            layout->addWidget(integerButton, 0, 0);
            layout->addWidget(integerLabel, 0, 1);
            layout->addWidget(doubleButton, 1, 0);
            layout->addWidget(doubleLabel, 1, 1);
            layout->addWidget(itemButton, 2, 0);
            layout->addWidget(itemLabel, 2, 1);
            layout->addWidget(textButton, 3, 0);
            layout->addWidget(textLabel, 3, 1);
            layout->addWidget(colorButton, 4, 0);
            layout->addWidget(colorLabel, 4, 1);
            layout->addWidget(fontButton, 5, 0);
            layout->addWidget(fontLabel, 5, 1);
            layout->addWidget(directoryButton, 6, 0);
            layout->addWidget(directoryLabel, 6, 1);
            layout->addWidget(openFileNameButton, 7, 0);
            layout->addWidget(openFileNameLabel, 7, 1);
            layout->addWidget(openFileNamesButton, 8, 0);
            layout->addWidget(openFileNamesLabel, 8, 1);
            layout->addWidget(saveFileNameButton, 9, 0);
            layout->addWidget(saveFileNameLabel, 9, 1);
            layout->addWidget(criticalButton, 10, 0);
            layout->addWidget(criticalLabel, 10, 1);
            layout->addWidget(informationButton, 11, 0);
            layout->addWidget(informationLabel, 11, 1);
            layout->addWidget(questionButton, 12, 0);
            layout->addWidget(questionLabel, 12, 1);
            layout->addWidget(warningButton, 13, 0);
            layout->addWidget(warningLabel, 13, 1);
            layout->addWidget(errorButton, 14, 0);
            layout->addWidget(errorLabel, 14, 1);
            setLayout(layout);

            setWindowTitle(tr("Standard Dialogs"));
        }

        void Dialog::setInteger()
        {
            bool ok;
            int i = QInputDialog::getInteger(this, tr("QInputDialog::getInteger()"),
                                             tr("Percentage:"), 25, 0, 100, 1, &ok);
            if (ok)
                integerLabel->setText(tr("%1%").arg(i));
        }

        void Dialog::setDouble()
        {
            bool ok;
            double d = QInputDialog::getDouble(this, tr("QInputDialog::getDouble()"),
                                               tr("Amount:"), 37.56, -10000, 10000, 2, &ok);
            if (ok)
                doubleLabel->setText(QString("$%1").arg(d));
        }

        void Dialog::setItem()
        {
            QStringList items;
            items << tr("Spring") << tr("Summer") << tr("Fall") << tr("Winter");

            bool ok;
            QString item = QInputDialog::getItem(this, tr("QInputDialog::getItem()"),
                                                 tr("Season:"), items, 0, false, &ok);
            if (ok && !item.isEmpty())
                itemLabel->setText(item);
        }

        void Dialog::setText()
        {
            bool ok;
            QString text = QInputDialog::getText(this, tr("QInputDialog::getText()"),
                                                 tr("User name:"), QLineEdit::Normal,
                                                 QDir::home().dirName(), &ok);
            if (ok && !text.isEmpty())
                textLabel->setText(text);
        }

        void Dialog::setColor()
        {
            QColor color = QColorDialog::getColor(Qt::green, this);
            if (color.isValid()) {
                colorLabel->setText(color.name());
                colorLabel->setPalette(QPalette(color));
            }
        }

        void Dialog::setFont()
        {
            bool ok;
            QFont font = QFontDialog::getFont(&ok, QFont(fontLabel->text()), this);
            if (ok)
                fontLabel->setText(font.key());
        }

        void Dialog::setExistingDirectory()
        {
            QString directory = QFileDialog::getExistingDirectory(this,
                                        tr("QFileDialog::getExistingDirectory()"),
                                        directoryLabel->text(),
                                        QFileDialog::DontResolveSymlinks
                                        | QFileDialog::ShowDirsOnly);
            if (!directory.isEmpty())
                directoryLabel->setText(directory);
        }

        void Dialog::setOpenFileName()
        {
            QString fileName = QFileDialog::getOpenFileName(this,
                                        tr("QFileDialog::getOpenFileName()"),
                                        openFileNameLabel->text(),
                                        tr("All Files (*);;Text Files (*.txt)"));
            if (!fileName.isEmpty())
                openFileNameLabel->setText(fileName);
        }

        void Dialog::setOpenFileNames()
        {
            QStringList files = QFileDialog::getOpenFileNames(
                                        this, tr("QFileDialog::getOpenFileNames()"),
                                        openFilesPath,
                                        tr("All Files (*);;Text Files (*.txt)"));
            if (files.count()) {
                openFilesPath = files[0];
                openFileNamesLabel->setText(QString("[%1]").arg(files.join(", ")));
            }
        }

        void Dialog::setSaveFileName()
        {
            QString fileName = QFileDialog::getSaveFileName(this,
                                        tr("QFileDialog::getSaveFileName()"),
                                        saveFileNameLabel->text(),
                                        tr("All Files (*);;Text Files (*.txt)"));
            if (!fileName.isEmpty())
                saveFileNameLabel->setText(fileName);
        }

        void Dialog::criticalMessage()
        {
            int reply = QMessageBox::critical(this, tr("QMessageBox::showCritical()"),
                                              MESSAGE,
                                              QMessageBox::Abort,
                                              QMessageBox::Retry,
                                              QMessageBox::Ignore);
            if (reply == QMessageBox::Abort)
                criticalLabel->setText(tr("Abort"));
            else if (reply == QMessageBox::Retry)
                criticalLabel->setText(tr("Retry"));
            else
                criticalLabel->setText(tr("Ignore"));
        }

        void Dialog::informationMessage()
        {
            QMessageBox::information(this, tr("QMessageBox::showInformation()"), MESSAGE);
            informationLabel->setText(tr("Closed with OK or Esc"));
        }

        void Dialog::questionMessage()
        {
            int reply = QMessageBox::question(this, tr("QMessageBox::showQuestion()"),
                                              MESSAGE,
                                              QMessageBox::Yes,
                                              QMessageBox::No,
                                              QMessageBox::Cancel);
            if (reply == QMessageBox::Yes)
                questionLabel->setText(tr("Yes"));
            else if (reply == QMessageBox::No)
                questionLabel->setText(tr("No"));
            else
                questionLabel->setText(tr("Cancel"));
        }

        void Dialog::warningMessage()
        {
            int reply = QMessageBox::warning(this, tr("QMessageBox::showWarning()"),
                                             MESSAGE,
                                             tr("Save &Again"),
                                             tr("&Continue"));
            if (reply == 0)
                warningLabel->setText(tr("Save Again"));
            else
                warningLabel->setText(tr("Continue"));

        }

        void Dialog::errorMessage()
        {
            errorMessageDialog->showMessage(
                    tr("This dialog shows and remembers error messages. "
                       "If the checkbox is checked (as it is by default), "
                       "the shown message will be shown again, "
                       "but if the user unchecks the box the message "
                       "will not appear again if QErrorMessage::showMessage() "
                       "is called with the same message."));
            errorLabel->setText(tr("If the box is unchecked, the message "
                                   "won't appear again."));
        }