- Qt 5.5
- Qt Widgets
- Elided Label Example
- testwidget.cpp Example File
- Qt 5.5.1 Reference Documentation

# testwidget.cpp Example File

widgets/elidedlabel/testwidget.cpp

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    #include "testwidget.h"
    #include "elidedlabel.h"

    #include <QtWidgets/QLabel>
    #include <QtWidgets/QPushButton>
    #include <QtWidgets/QSizePolicy>
    #include <QtWidgets/QGridLayout>

    TestWidget::TestWidget(QWidget *parent):
        QWidget(parent)
    {
        const QString romeo = tr(
            "But soft, what light through yonder window breaks? / "
            "It is the east, and Juliet is the sun. / "
            "Arise, fair sun, and kill the envious moon, / "
            "Who is already sick and pale with grief / "
            "That thou, her maid, art far more fair than she."
        );

        const QString macbeth = tr(
            "To-morrow, and to-morrow, and to-morrow, / "
            "Creeps in this petty pace from day to day, / "
            "To the last syllable of recorded time; / "
            "And all our yesterdays have lighted fools / "
            "The way to dusty death. Out, out, brief candle! / "
            "Life's but a walking shadow, a poor player, / "
            "That struts and frets his hour upon the stage, / "
            "And then is heard no more. It is a tale / "
            "Told by an idiot, full of sound and fury, / "
            "Signifying nothing."
        );

        const QString harry = tr("Feeling lucky, punk?");

        textSamples << romeo << macbeth << harry;

        sampleIndex = 0;
        elidedText = new ElidedLabel(textSamples[sampleIndex], this);
        elidedText->setFrameStyle(QFrame::Box);

        QPushButton *switchButton = new QPushButton(tr("Switch text"));
        connect(switchButton, SIGNAL(clicked(bool)), this, SLOT(switchText()));

        QPushButton *exitButton = new QPushButton(tr("Exit"));
        connect(exitButton, SIGNAL(clicked(bool)), this, SLOT(close()));

        QLabel *label = new QLabel(tr("Elided"));
        label->setVisible(elidedText->isElided());
        connect(elidedText, SIGNAL(elisionChanged(bool)), label, SLOT(setVisible(bool)));

        widthSlider = new QSlider(Qt::Horizontal);
        widthSlider->setMinimum(0);
        connect(widthSlider, SIGNAL(valueChanged(int)), this, SLOT(onWidthChanged(int)));

        heightSlider = new QSlider(Qt::Vertical);
        heightSlider->setInvertedAppearance(true);
        heightSlider->setMinimum(0);
        connect(heightSlider, SIGNAL(valueChanged(int)), this, SLOT(onHeightChanged(int)));

        QGridLayout *layout = new QGridLayout();
        layout->addWidget(label, 0, 1, Qt::AlignCenter);
        layout->addWidget(switchButton, 0, 2);
        layout->addWidget(exitButton, 0, 3);
        layout->addWidget(widthSlider, 1, 1, 1, 3);
        layout->addWidget(heightSlider, 2, 0);
        layout->addWidget(elidedText, 2, 1, 1, 3, Qt::AlignTop | Qt::AlignLeft);

        setLayout(layout);
    }

    void TestWidget::resizeEvent(QResizeEvent *event)
    {
        Q_UNUSED(event)

        int maxWidth = widthSlider->width();
        widthSlider->setMaximum(maxWidth);
        widthSlider->setValue(maxWidth / 2);

        int maxHeight = heightSlider->height();
        heightSlider->setMaximum(maxHeight);
        heightSlider->setValue(maxHeight / 2);

        elidedText->setFixedSize(widthSlider->value(), heightSlider->value());
    }

    void TestWidget::switchText()
    {
        sampleIndex = (sampleIndex + 1) % textSamples.size();
        elidedText->setText(textSamples.at(sampleIndex));
    }

    void TestWidget::onWidthChanged(int width)
    {
        elidedText->setFixedWidth(width);
    }

    void TestWidget::onHeightChanged(int height)
    {
        elidedText->setFixedHeight(height);
    }