qt5base-lts/examples/widgets/charactermap/mainwindow.cpp

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#include <QtWidgets>

#include "characterwidget.h"
#include "mainwindow.h"

//! [0]
MainWindow::MainWindow()
{
    QWidget *centralWidget = new QWidget;

    QLabel *fontLabel = new QLabel(tr("Font:"));
    fontCombo = new QFontComboBox;
    QLabel *sizeLabel = new QLabel(tr("Size:"));
    sizeCombo = new QComboBox;
    QLabel *styleLabel = new QLabel(tr("Style:"));
    styleCombo = new QComboBox;
    QLabel *fontMergingLabel = new QLabel(tr("Automatic Font Merging:"));
    fontMerging = new QCheckBox;
    fontMerging->setChecked(true);

    scrollArea = new QScrollArea;
    characterWidget = new CharacterWidget;
    scrollArea->setWidget(characterWidget);
//! [0]

//! [1]
    findStyles(fontCombo->currentFont());
//! [1]
    findSizes(fontCombo->currentFont());

//! [2]
    lineEdit = new QLineEdit;
    QPushButton *clipboardButton = new QPushButton(tr("&To clipboard"));
//! [2]

//! [3]
    clipboard = QApplication::clipboard();
//! [3]

//! [4]
    connect(fontCombo, SIGNAL(currentFontChanged(QFont)),
            this, SLOT(findStyles(QFont)));
    connect(fontCombo, SIGNAL(currentFontChanged(QFont)),
            this, SLOT(findSizes(QFont)));
    connect(fontCombo, SIGNAL(currentFontChanged(QFont)),
            characterWidget, SLOT(updateFont(QFont)));
    connect(sizeCombo, SIGNAL(currentIndexChanged(QString)),
            characterWidget, SLOT(updateSize(QString)));
    connect(styleCombo, SIGNAL(currentIndexChanged(QString)),
            characterWidget, SLOT(updateStyle(QString)));
//! [4] //! [5]
    connect(characterWidget, SIGNAL(characterSelected(QString)),
            this, SLOT(insertCharacter(QString)));
    connect(clipboardButton, SIGNAL(clicked()), this, SLOT(updateClipboard()));
//! [5]
    connect(fontMerging, SIGNAL(toggled(bool)), characterWidget, SLOT(updateFontMerging(bool)));

//! [6]
    QHBoxLayout *controlsLayout = new QHBoxLayout;
    controlsLayout->addWidget(fontLabel);
    controlsLayout->addWidget(fontCombo, 1);
    controlsLayout->addWidget(sizeLabel);
    controlsLayout->addWidget(sizeCombo, 1);
    controlsLayout->addWidget(styleLabel);
    controlsLayout->addWidget(styleCombo, 1);
    controlsLayout->addWidget(fontMergingLabel);
    controlsLayout->addWidget(fontMerging, 1);
    controlsLayout->addStretch(1);

    QHBoxLayout *lineLayout = new QHBoxLayout;
    lineLayout->addWidget(lineEdit, 1);
    lineLayout->addSpacing(12);
    lineLayout->addWidget(clipboardButton);

    QVBoxLayout *centralLayout = new QVBoxLayout;
    centralLayout->addLayout(controlsLayout);
    centralLayout->addWidget(scrollArea, 1);
    centralLayout->addSpacing(4);
    centralLayout->addLayout(lineLayout);
    centralWidget->setLayout(centralLayout);

    setCentralWidget(centralWidget);
    setWindowTitle(tr("Character Map"));
}
//! [6]

//! [7]
void MainWindow::findStyles(const QFont &font)
{
    QFontDatabase fontDatabase;
    QString currentItem = styleCombo->currentText();
    styleCombo->clear();
//! [7]

//! [8]
    QString style;
    foreach (style, fontDatabase.styles(font.family()))
        styleCombo->addItem(style);

    int styleIndex = styleCombo->findText(currentItem);

    if (styleIndex == -1)
        styleCombo->setCurrentIndex(0);
    else
        styleCombo->setCurrentIndex(styleIndex);
}
//! [8]

void MainWindow::findSizes(const QFont &font)
{
    QFontDatabase fontDatabase;
    QString currentSize = sizeCombo->currentText();
    sizeCombo->blockSignals(true);
    sizeCombo->clear();

    int size;
    if(fontDatabase.isSmoothlyScalable(font.family(), fontDatabase.styleString(font))) {
        foreach(size, QFontDatabase::standardSizes()) {
            sizeCombo->addItem(QVariant(size).toString());
            sizeCombo->setEditable(true);
        }

    } else {
        foreach(size, fontDatabase.smoothSizes(font.family(), fontDatabase.styleString(font))) {
            sizeCombo->addItem(QVariant(size).toString());
            sizeCombo->setEditable(false);
        }
    }

    sizeCombo->blockSignals(false);

    int sizeIndex = sizeCombo->findText(currentSize);

    if(sizeIndex == -1)
        sizeCombo->setCurrentIndex(qMax(0, sizeCombo->count() / 3));
    else
        sizeCombo->setCurrentIndex(sizeIndex);
}

//! [9]
void MainWindow::insertCharacter(const QString &character)
{
    lineEdit->insert(character);
}
//! [9]

//! [10]
void MainWindow::updateClipboard()
{
//! [11]
    clipboard->setText(lineEdit->text(), QClipboard::Clipboard);
//! [11]
    clipboard->setText(lineEdit->text(), QClipboard::Selection);
}
//! [10]