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Diffstat (limited to 'examples/widgets/widgets/elidedlabel/elidedlabel.cpp')
-rw-r--r-- | examples/widgets/widgets/elidedlabel/elidedlabel.cpp | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/examples/widgets/widgets/elidedlabel/elidedlabel.cpp b/examples/widgets/widgets/elidedlabel/elidedlabel.cpp new file mode 100644 index 0000000000..5f58bbcca8 --- /dev/null +++ b/examples/widgets/widgets/elidedlabel/elidedlabel.cpp @@ -0,0 +1,111 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor +** the names of its contributors may be used to endorse or promote +** products derived from this software without specific prior written +** permission. +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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] |