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1 /*
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2 * Copyright (C) 2016 The Qt Company Ltd.
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3 * Contact: https://www.qt.io/licensing/
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4 *
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5 * This file is part of the QtCore module of the Qt Toolkit.
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6 *
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7 * "Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions are
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9 * met:
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10 * * Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * * Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in
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14 * the documentation and/or other materials provided with the
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15 * distribution.
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16 * * Neither the name of The Qt Company Ltd nor the names of its
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17 * contributors may be used to endorse or promote products derived
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18 * from this software without specific prior written permission.
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19 *
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20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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31 */
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32
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33 #include "gui/widgets/elided_label.h"
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34
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35 #include <QPainter>
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36 #include <QSizePolicy>
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37 #include <QTextLayout>
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38
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39 ElidedLabel::ElidedLabel(const QString& text, QWidget* parent)
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40 : QFrame(parent), content(text) {
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41 setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
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42 }
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43
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44 void ElidedLabel::SetText(const QString& text) {
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45 content = text;
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46 update();
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47 }
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48
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49 void ElidedLabel::paintEvent(QPaintEvent *event) {
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50 QFrame::paintEvent(event);
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51
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52 QPainter painter(this);
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53 QFontMetrics fontMetrics = painter.fontMetrics();
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54
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55 int line_spacing = fontMetrics.lineSpacing();
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56 int y = 0;
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57
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58 QTextLayout textLayout(content, painter.font());
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59 textLayout.beginLayout();
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60 for (;;) {
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61 QTextLine line = textLayout.createLine();
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62
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63 if (!line.isValid())
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64 break;
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65
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66 line.setLineWidth(width());
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67 int nextLineY = y + line_spacing;
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68
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69 if (height() >= nextLineY + line_spacing) {
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70 line.draw(&painter, QPoint(0, y));
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71 y = nextLineY;
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72 } else {
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73 QString last_line = content.mid(line.textStart());
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74 QString elided_last_line = fontMetrics.elidedText(last_line, Qt::ElideRight, width());
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75 painter.drawText(QPoint(0, y + fontMetrics.ascent()), elided_last_line);
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76 line = textLayout.createLine();
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77 break;
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78 }
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79 }
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80 textLayout.endLayout();
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81 }
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