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kfontutils.cpp
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1 /*********************************************************************************
2  * *
3  * Copyright (C) 2005, 2009 by Albert Astals Cid <aacid@kde.org> *
4  * *
5  * This library is free software; you can redistribute it and/or *
6  * modify it under the terms of the GNU Lesser General Public *
7  * License as published by the Free Software Foundation; either *
8  * version 2.1 of the License, or (at your option) version 3, or any *
9  * later version accepted by the membership of KDE e.V. (or its *
10  * successor approved by the membership of KDE e.V.), which shall *
11  * act as a proxy defined in Section 6 of version 3 of the license. *
12  * *
13  * This library is distributed in the hope that it will be useful, *
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
16  * Lesser General Public License for more details. *
17  * *
18  * You should have received a copy of the GNU Lesser General Public *
19  * License along with this library. If not, see <http://www.gnu.org/licenses/>. *
20  * *
21  *********************************************************************************/
22 
23 #include "kfontutils.h"
24 
25 #include <qpainter.h>
26 
27 qreal KFontUtils::adaptFontSize(QPainter &painter, const QString &string, qreal width, qreal height, qreal maxFontSize, qreal minFontSize, AdaptFontSizeOptions flags)
28 {
29  qreal size = maxFontSize;
30  QRectF boundingRect;
31  bool done = false;
32 
33  while (!done && size > minFontSize) {
34  QFont f = painter.font();
35  f.setPointSizeF(size);
36  painter.setFont(f);
37  int qtFlags = Qt::AlignCenter | Qt::TextWordWrap;
38  if (flags & DoNotAllowWordWrap) {
39  qtFlags = qtFlags & ~Qt::TextWordWrap;
40  }
41  boundingRect = painter.boundingRect(QRectF(0, 0, width, height), qtFlags, string);
42  if (boundingRect.width() == 0 || boundingRect.height() == 0) {
43  return -1;
44  } else if (boundingRect.width() > width || boundingRect.height() > height) {
45  size = qMin(width * size / boundingRect.width(), height * size / boundingRect.height());
46  } else {
47  done = true;
48  }
49  }
50 
51  return size;
52 }
53 
54 qreal KFontUtils::adaptFontSize(QPainter &painter, const QString &text, const QSizeF &availableSize, qreal maxFontSize, qreal minFontSize, AdaptFontSizeOptions flags)
55 {
56  return adaptFontSize(painter, text, availableSize.width(), availableSize.height(), maxFontSize, minFontSize, flags);
57 }
58 
QPainter::font
const QFont & font() const
QFont
QPainter::setFont
void setFont(const QFont &font)
QPainter::boundingRect
QRectF boundingRect(const QRectF &rectangle, int flags, const QString &text)
QPainter
KFontUtils::DoNotAllowWordWrap
Definition: kfontutils.h:37
QString
QFont::setPointSizeF
void setPointSizeF(qreal pointSize)
QRectF::width
qreal width() const
QSizeF
QRectF
kfontutils.h
QRectF::height
qreal height() const
KFontUtils::adaptFontSize
qreal adaptFontSize(QPainter &painter, const QString &text, qreal width, qreal height, qreal maxFontSize=28.0, qreal minFontSize=1.0, AdaptFontSizeOptions flags=NoFlags)
Helper function that calculates the biggest font size (in points) used drawing a centered text using ...
Definition: kfontutils.cpp:27
QSizeF::height
qreal height() const
QSizeF::width
qreal width() const
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