Qt 5.9 | Qt Widgets | Elided Label Example | testwidget.cpp Example File

Qt 5.9.9 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);
      }