dialog.cpp Example File | Qt Widgets 5.12.11

- Qt 5.12
- Qt Widgets
- Standard Dialogs Example
- dialog.cpp Example File
- Qt 5.12.11 Reference Documentation

# dialog.cpp Example File

dialogs/standarddialogs/dialog.cpp

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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).")
     #define MESSAGE_DETAILS \
         Dialog::tr("If a message box has detailed text, the user can reveal it " \
                    "by pressing the Show Details... button.")

     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 *verticalLayout;
         if (QGuiApplication::styleHints()->showIsFullScreen() || QGuiApplication::styleHints()->showIsMaximized()) {
             QHBoxLayout *horizontalLayout = new QHBoxLayout(this);
             QGroupBox *groupBox = new QGroupBox(QGuiApplication::applicationDisplayName(), this);
             horizontalLayout->addWidget(groupBox);
             verticalLayout = new QVBoxLayout(groupBox);
         } else {
             verticalLayout = new QVBoxLayout(this);
         }

         QToolBox *toolbox = new QToolBox;
         verticalLayout->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()"));

         multiLineTextLabel = new QLabel;
         multiLineTextLabel->setFrameStyle(frameStyle);
         QPushButton *multiLineTextButton = new QPushButton(tr("QInputDialog::get&MultiLineText()"));

         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, &QAbstractButton::clicked, this, &Dialog::setInteger);
         connect(doubleButton, &QAbstractButton::clicked, this, &Dialog::setDouble);
         connect(itemButton, &QAbstractButton::clicked, this, &Dialog::setItem);
         connect(textButton, &QAbstractButton::clicked, this, &Dialog::setText);
         connect(multiLineTextButton, &QAbstractButton::clicked, this, &Dialog::setMultiLineText);
         connect(colorButton, &QAbstractButton::clicked, this, &Dialog::setColor);
         connect(fontButton, &QAbstractButton::clicked, this, &Dialog::setFont);
         connect(directoryButton, &QAbstractButton::clicked,
                 this, &Dialog::setExistingDirectory);
         connect(openFileNameButton, &QAbstractButton::clicked,
                 this, &Dialog::setOpenFileName);
         connect(openFileNamesButton, &QAbstractButton::clicked,
                 this, &Dialog::setOpenFileNames);
         connect(saveFileNameButton, &QAbstractButton::clicked,
                 this, &Dialog::setSaveFileName);
         connect(criticalButton, &QAbstractButton::clicked, this, &Dialog::criticalMessage);
         connect(informationButton, &QAbstractButton::clicked,
                 this, &Dialog::informationMessage);
         connect(questionButton, &QAbstractButton::clicked, this, &Dialog::questionMessage);
         connect(warningButton, &QAbstractButton::clicked, this, &Dialog::warningMessage);
         connect(errorButton, &QAbstractButton::clicked, this, &Dialog::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->addWidget(multiLineTextButton, 4, 0);
         layout->addWidget(multiLineTextLabel, 4, 1);
         layout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding), 5, 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("Show scalable fonts"), QFontDialog::ScalableFonts);
         fontDialogOptionsWidget->addCheckBox(tr("Show non scalable fonts"), QFontDialog::NonScalableFonts);
         fontDialogOptionsWidget->addCheckBox(tr("Show monospaced fonts"), QFontDialog::MonospacedFonts);
         fontDialogOptionsWidget->addCheckBox(tr("Show proportional fonts"), QFontDialog::ProportionalFonts);
         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);
         fileDialogOptionsWidget->addCheckBox(tr("Do not use custom directory icons (Windows)"), QFileDialog::DontUseCustomDirectoryIcons);
         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(QGuiApplication::applicationDisplayName());
     }

     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::setMultiLineText()
     {
         bool ok;
         QString text = QInputDialog::getMultiLineText(this, tr("QInputDialog::getMultiLineText()"),
                                                       tr("Address:"), "John Doe\nFreedom Street", &ok);
         if (ok && !text.isEmpty())
             multiLineTextLabel->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.setDetailedText(MESSAGE_DETAILS);
         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."));
     }