dialog.cpp Example File

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 #include <QtWidgets>

 #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).")

 class DialogOptionsWidget : public QGroupBox
 {
 public:
     explicit DialogOptionsWidget(QWidget *parent = 0);

     void addCheckBox(const QString &text, int value);
     void addSpacer();
     int value() const;

 private:
     typedef QPair<QCheckBox *, int> CheckBoxEntry;
     QVBoxLayout *layout;
     QList<CheckBoxEntry> checkBoxEntries;
 };

 DialogOptionsWidget::DialogOptionsWidget(QWidget *parent) :
     QGroupBox(parent) , layout(new QVBoxLayout)
 {
     setTitle(Dialog::tr("Options"));
     setLayout(layout);
 }

 void DialogOptionsWidget::addCheckBox(const QString &text, int value)
 {
     QCheckBox *checkBox = new QCheckBox(text);
     layout->addWidget(checkBox);
     checkBoxEntries.append(CheckBoxEntry(checkBox, value));
 }

 void DialogOptionsWidget::addSpacer()
 {
     layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding));
 }

 int DialogOptionsWidget::value() const
 {
     int result = 0;
     foreach (const CheckBoxEntry &checkboxEntry, checkBoxEntries)
         if (checkboxEntry.first->isChecked())
             result |= checkboxEntry.second;
     return result;
 }

 Dialog::Dialog(QWidget *parent)
     : QWidget(parent)
 {
     QVBoxLayout *mainLayout = new QVBoxLayout(this);
     QToolBox *toolbox = new QToolBox;
     mainLayout->addWidget(toolbox);

     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()));

     QWidget *page = new QWidget;
     QGridLayout *layout = new QGridLayout(page);
     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->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 4, 0);
     toolbox->addItem(page, tr("Input Dialogs"));

     const QString doNotUseNativeDialog = tr("Do not use native dialog");

     page = new QWidget;
     layout = new QGridLayout(page);
     layout->setColumnStretch(1, 1);
     layout->addWidget(colorButton, 0, 0);
     layout->addWidget(colorLabel, 0, 1);
     colorDialogOptionsWidget = new DialogOptionsWidget;
     colorDialogOptionsWidget->addCheckBox(doNotUseNativeDialog, QColorDialog::DontUseNativeDialog);
     colorDialogOptionsWidget->addCheckBox(tr("Show alpha channel") , QColorDialog::ShowAlphaChannel);
     colorDialogOptionsWidget->addCheckBox(tr("No buttons") , QColorDialog::NoButtons);
     layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 1, 0);
     layout->addWidget(colorDialogOptionsWidget, 2, 0, 1 ,2);

     toolbox->addItem(page, tr("Color Dialog"));

     page = new QWidget;
     layout = new QGridLayout(page);
     layout->setColumnStretch(1, 1);
     layout->addWidget(fontButton, 0, 0);
     layout->addWidget(fontLabel, 0, 1);
     fontDialogOptionsWidget = new DialogOptionsWidget;
     fontDialogOptionsWidget->addCheckBox(doNotUseNativeDialog, QFontDialog::DontUseNativeDialog);
     fontDialogOptionsWidget->addCheckBox(tr("No buttons") , QFontDialog::NoButtons);
     layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 1, 0);
     layout->addWidget(fontDialogOptionsWidget, 2, 0, 1 ,2);
     toolbox->addItem(page, tr("Font Dialog"));

     page = new QWidget;
     layout = new QGridLayout(page);
     layout->setColumnStretch(1, 1);
     layout->addWidget(directoryButton, 0, 0);
     layout->addWidget(directoryLabel, 0, 1);
     layout->addWidget(openFileNameButton, 1, 0);
     layout->addWidget(openFileNameLabel, 1, 1);
     layout->addWidget(openFileNamesButton, 2, 0);
     layout->addWidget(openFileNamesLabel, 2, 1);
     layout->addWidget(saveFileNameButton, 3, 0);
     layout->addWidget(saveFileNameLabel, 3, 1);
     fileDialogOptionsWidget = new DialogOptionsWidget;
     fileDialogOptionsWidget->addCheckBox(doNotUseNativeDialog, QFileDialog::DontUseNativeDialog);
     fileDialogOptionsWidget->addCheckBox(tr("Show directories only"), QFileDialog::ShowDirsOnly);
     fileDialogOptionsWidget->addCheckBox(tr("Do not resolve symlinks"), QFileDialog::DontResolveSymlinks);
     fileDialogOptionsWidget->addCheckBox(tr("Do not confirm overwrite"), QFileDialog::DontConfirmOverwrite);
     fileDialogOptionsWidget->addCheckBox(tr("Do not use sheet"), QFileDialog::DontUseSheet);
     fileDialogOptionsWidget->addCheckBox(tr("Readonly"), QFileDialog::ReadOnly);
     fileDialogOptionsWidget->addCheckBox(tr("Hide name filter details"), QFileDialog::HideNameFilterDetails);
     layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 4, 0);
     layout->addWidget(fileDialogOptionsWidget, 5, 0, 1 ,2);
     toolbox->addItem(page, tr("File Dialogs"));

     page = new QWidget;
     layout = new QGridLayout(page);
     layout->setColumnStretch(1, 1);
     layout->addWidget(criticalButton, 0, 0);
     layout->addWidget(criticalLabel, 0, 1);
     layout->addWidget(informationButton, 1, 0);
     layout->addWidget(informationLabel, 1, 1);
     layout->addWidget(questionButton, 2, 0);
     layout->addWidget(questionLabel, 2, 1);
     layout->addWidget(warningButton, 3, 0);
     layout->addWidget(warningLabel, 3, 1);
     layout->addWidget(errorButton, 4, 0);
     layout->addWidget(errorLabel, 4, 1);
     layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 5, 0);
     toolbox->addItem(page, tr("Message Boxes"));

     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()
 {
     const QColorDialog::ColorDialogOptions options = QFlag(colorDialogOptionsWidget->value());
     const QColor color = QColorDialog::getColor(Qt::green, this, "Select Color", options);

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

 void Dialog::setFont()
 {
     const QFontDialog::FontDialogOptions options = QFlag(fontDialogOptionsWidget->value());
     bool ok;
     QFont font = QFontDialog::getFont(&ok, QFont(fontLabel->text()), this, "Select Font", options);
     if (ok) {
         fontLabel->setText(font.key());
         fontLabel->setFont(font);
     }
 }

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

 void Dialog::setOpenFileName()
 {
     const QFileDialog::Options options = QFlag(fileDialogOptionsWidget->value());
     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()
 {
     const QFileDialog::Options options = QFlag(fileDialogOptionsWidget->value());
     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()
 {
     const QFileDialog::Options options = QFlag(fileDialogOptionsWidget->value());
     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."));
 }