Qt 4.8: dialog.cpp Example File (dialogs/standarddialogs/dialog.cpp)

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# dialog.cpp Example File

dialogs/standarddialogs/dialog.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.
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     **     the documentation and/or other materials provided with the
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     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     #include <QtGui>

     #include "dialog.h"

     #define MESSAGE \
         Dialog::tr("<p>Message boxes have a caption, a text, " \
                    "and any number of buttons, each with standard or custom texts." \
                    "<p>Click a button to close the message box. Pressing the Esc button " \
                    "will activate the detected escape button (if any).")

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

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

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

         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::showM&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()));

         native = new QCheckBox(this);
         native->setText("Use native file dialog.");
         native->setChecked(true);

         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);
         layout->addWidget(native, 15, 0);
     #if defined(Q_OS_SYMBIAN) || defined(Q_WS_MAEMO_5) || defined(Q_WS_SIMULATOR)
         QWidget *widget = new QWidget;
         widget->setLayout(layout);

         QScrollArea *scrollArea = new QScrollArea(this);
         scrollArea->setWidget(widget);

         QHBoxLayout *mainLayout = new QHBoxLayout;
         mainLayout->addWidget(scrollArea);
         setLayout(mainLayout);
     #else
         setLayout(layout);
     #endif

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

     void Dialog::setInteger()
     {
         bool ok;
         int i = QInputDialog::getInt(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;
         if (native->isChecked())
             color = QColorDialog::getColor(Qt::green, this);
         else
             color = QColorDialog::getColor(Qt::green, this, "Select Color", QColorDialog::DontUseNativeDialog);

         if (color.isValid()) {
             colorLabel->setText(color.name());
             colorLabel->setPalette(QPalette(color));
             colorLabel->setAutoFillBackground(true);
         }
     }

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

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

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

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

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

     void Dialog::criticalMessage()
     {
         QMessageBox::StandardButton reply;
         reply = QMessageBox::critical(this, tr("QMessageBox::critical()"),
                                         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::StandardButton reply;
         reply = QMessageBox::information(this, tr("QMessageBox::information()"), MESSAGE);
         if (reply == QMessageBox::Ok)
             informationLabel->setText(tr("OK"));
         else
             informationLabel->setText(tr("Escape"));
     }

     void Dialog::questionMessage()
     {
         QMessageBox::StandardButton reply;
         reply = QMessageBox::question(this, tr("QMessageBox::question()"),
                                         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()
     {
         QMessageBox msgBox(QMessageBox::Warning, tr("QMessageBox::warning()"),
                            MESSAGE, 0, this);
         msgBox.addButton(tr("Save &Again"), QMessageBox::AcceptRole);
         msgBox.addButton(tr("&Continue"), QMessageBox::RejectRole);
         if (msgBox.exec() == QMessageBox::AcceptRole)
             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."));
     }