153 lines
4.8 KiB
C++
153 lines
4.8 KiB
C++
/************************************************************************
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**
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** @file velidedlabel.cpp
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** @author Roman Telezhynskyi <dismine(at)gmail.com>
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** @date 8 5, 2020
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**
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** @brief
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** @copyright
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** This source code is part of the Valentina project, a pattern making
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** program, whose allow create and modeling patterns of clothing.
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** Copyright (C) 2020 Valentina project
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** <https://gitlab.com/smart-pattern/valentina> All Rights Reserved.
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**
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** Valentina is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** Valentina is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with Valentina. If not, see <http://www.gnu.org/licenses/>.
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**
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*************************************************************************/
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#include "velidedlabel.h"
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#include <QPainter>
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#include <QTextLayout>
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#include <ciso646>
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//---------------------------------------------------------------------------------------------------------------------
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VElidedLabel::VElidedLabel(QWidget *parent)
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: QFrame(parent)
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{
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// reserve size for one line of text
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setMinimumHeight(fontMetrics().lineSpacing());
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}
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//---------------------------------------------------------------------------------------------------------------------
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VElidedLabel::VElidedLabel(const QString &text, QWidget *parent)
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: QFrame(parent),
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m_content(text)
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{
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// reserve size for one line of text
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setMinimumHeight(fontMetrics().lineSpacing());
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}
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//---------------------------------------------------------------------------------------------------------------------
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void VElidedLabel::setText(const QString &text)
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{
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m_content = text;
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update();
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}
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//---------------------------------------------------------------------------------------------------------------------
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void VElidedLabel::paintEvent(QPaintEvent *event)
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{
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QFrame::paintEvent(event);
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QPainter painter(this);
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bool didElide = false;
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int y = 0;
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// QTextLayout works with paragraphs
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QStringList paragraphs = m_content.split('\n');
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for (int i = 0; i < paragraphs.size(); ++i)
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{
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if (not DrawParagraph(painter, paragraphs.at(i), y, didElide))
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{
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// It text has empty strings a user will not see elided string, but we still want to show a tooltip.
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if (i != paragraphs.size()-1 && !didElide)
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{
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didElide = true;
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}
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break;
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}
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}
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if (didElide != m_elided)
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{
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m_elided = didElide;
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if (m_showElided)
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{
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if (m_elided)
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{
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// Show a tooltip in case we cannot show a whole text in the widget
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// Use dumb html tag to separate paragraphs.
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QString toolTip;
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for(int i = 0; i < paragraphs.size(); ++i)
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{
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if (i != 0)
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{
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toolTip.append(QString("<br>"));
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}
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toolTip.append(QString("<font>%1</font>").arg(paragraphs.at(i)));
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}
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setToolTip(toolTip);
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}
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else
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{
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setToolTip(QString());
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}
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}
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emit ElisionChanged(didElide);
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}
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}
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//---------------------------------------------------------------------------------------------------------------------
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bool VElidedLabel::DrawParagraph(QPainter &painter, const QString& paragraph, int &y, bool &didElide)
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{
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QFontMetrics fontMetrics = painter.fontMetrics();
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int lineSpacing = fontMetrics.lineSpacing();
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bool ok = true;
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QTextLayout textLayout(paragraph, painter.font());
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textLayout.beginLayout();
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forever
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{
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QTextLine line = textLayout.createLine();
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if (!line.isValid())
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{
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break;
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}
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line.setLineWidth(width());
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int nextLineY = y + lineSpacing;
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if (height() >= nextLineY + lineSpacing)
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{
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line.draw(&painter, QPoint(0, y));
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y = nextLineY;
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}
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else
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{
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QString lastLine = paragraph.mid(line.textStart());
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QString elidedLastLine = fontMetrics.elidedText(lastLine, Qt::ElideRight, width());
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painter.drawText(QPoint(0, y + fontMetrics.ascent()), elidedLastLine);
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y = nextLineY;
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ok = false;
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didElide = lastLine != elidedLastLine;
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break;
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}
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}
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textLayout.endLayout();
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return ok;
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}
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