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Diffstat (limited to 'examples/widgets/elidedlabel/elidedlabel.cpp')
-rw-r--r-- | examples/widgets/elidedlabel/elidedlabel.cpp | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/examples/widgets/elidedlabel/elidedlabel.cpp b/examples/widgets/elidedlabel/elidedlabel.cpp new file mode 100644 index 0000000000..4f3ac5e843 --- /dev/null +++ b/examples/widgets/elidedlabel/elidedlabel.cpp @@ -0,0 +1,71 @@ +#include "elidedlabel.h" + +#include <QPainter> +#include <QTextLayout> +#include <QDebug> + +//! [0] +ElidedLabel::ElidedLabel(const QString &text, QWidget *parent) + : QFrame(parent) + , elided(false) + , content(text) +{ + setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred); +} +//! [0] + +//! [1] +void ElidedLabel::setText(const QString &newText) +{ + content = newText; + update(); +} +//! [1] + +//! [2] +void ElidedLabel::paintEvent(QPaintEvent *event) +{ + QFrame::paintEvent(event); + + QPainter painter(this); + QFontMetrics fontMetrics = painter.fontMetrics(); + + bool didElide = false; + int lineSpacing = fontMetrics.lineSpacing(); + int y = 0; + + QTextLayout textLayout(content, painter.font()); + textLayout.beginLayout(); + forever { + QTextLine line = textLayout.createLine(); + + if (!line.isValid()) + break; + + line.setLineWidth(width()); + int nextLineY = y + lineSpacing; + + if (height() >= nextLineY + lineSpacing) { + line.draw(&painter, QPoint(0, y)); + y = nextLineY; + //! [2] + //! [3] + } else { + QString lastLine = content.mid(line.textStart()); + QString elidedLastLine = fontMetrics.elidedText(lastLine, Qt::ElideRight, width()); + painter.drawText(QPoint(0, y + fontMetrics.ascent()), elidedLastLine); + line = textLayout.createLine(); + didElide = line.isValid(); + break; + } + } + textLayout.endLayout(); + //! [3] + + //! [4] + if (didElide != elided) { + elided = didElide; + emit elisionChanged(didElide); + } +} +//! [4] |