qt_demoe/designer/form/fontpanel.cpp

309 lines
10 KiB
C++

/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the tools applications of the Qt Toolkit.
**
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** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
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** GNU Lesser General Public License Usage
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** General Public License version 3.0 as published by the Free Software
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** packaging of this file. Please review the following information to
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#include "fontpanel.h"
#include <QtGui/QLabel>
#include <QtGui/QComboBox>
#include <QtGui/QFormLayout>
#include <QtGui/QSpacerItem>
#include <QtGui/QFontComboBox>
#include <QtCore/QTimer>
#include <QtGui/QLineEdit>
QT_BEGIN_NAMESPACE
FontPanel::FontPanel(QWidget *parentWidget) :
QGroupBox(parentWidget),
m_previewLineEdit(new QLineEdit),
m_writingSystemComboBox(new QComboBox),
m_familyComboBox(new QFontComboBox),
m_styleComboBox(new QComboBox),
m_pointSizeComboBox(new QComboBox),
m_previewFontUpdateTimer(0)
{
setTitle(tr("Font"));
QFormLayout *formLayout = new QFormLayout(this);
// writing systems
m_writingSystemComboBox->setEditable(false);
QList<QFontDatabase::WritingSystem> writingSystems = m_fontDatabase.writingSystems();
writingSystems.push_front(QFontDatabase::Any);
foreach (QFontDatabase::WritingSystem ws, writingSystems)
m_writingSystemComboBox->addItem(QFontDatabase::writingSystemName(ws), QVariant(ws));
connect(m_writingSystemComboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(slotWritingSystemChanged(int)));
formLayout->addRow(tr("&Writing system"), m_writingSystemComboBox);
connect(m_familyComboBox, SIGNAL(currentFontChanged(QFont)), this, SLOT(slotFamilyChanged(QFont)));
formLayout->addRow(tr("&Family"), m_familyComboBox);
m_styleComboBox->setEditable(false);
connect(m_styleComboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(slotStyleChanged(int)));
formLayout->addRow(tr("&Style"), m_styleComboBox);
m_pointSizeComboBox->setEditable(false);
connect(m_pointSizeComboBox, SIGNAL(currentIndexChanged(int)), this, SLOT(slotPointSizeChanged(int)));
formLayout->addRow(tr("&Point size"), m_pointSizeComboBox);
m_previewLineEdit->setReadOnly(true);
formLayout->addRow(m_previewLineEdit);
setWritingSystem(QFontDatabase::Any);
}
QFont FontPanel::selectedFont() const
{
QFont rc = m_familyComboBox->currentFont();
const QString family = rc.family();
rc.setPointSize(pointSize());
const QString styleDescription = styleString();
if (styleDescription.contains(QLatin1String("Italic")))
rc.setStyle(QFont::StyleItalic);
else if (styleDescription.contains(QLatin1String("Oblique")))
rc.setStyle(QFont::StyleOblique);
else
rc.setStyle(QFont::StyleNormal);
rc.setBold(m_fontDatabase.bold(family, styleDescription));
// Weight < 0 asserts...
const int weight = m_fontDatabase.weight(family, styleDescription);
if (weight >= 0)
rc.setWeight(weight);
return rc;
}
void FontPanel::setSelectedFont(const QFont &f)
{
m_familyComboBox->setCurrentFont(f);
if (m_familyComboBox->currentIndex() < 0) {
// family not in writing system - find the corresponding one?
QList<QFontDatabase::WritingSystem> familyWritingSystems = m_fontDatabase.writingSystems(f.family());
if (familyWritingSystems.empty())
return;
setWritingSystem(familyWritingSystems.front());
m_familyComboBox->setCurrentFont(f);
}
updateFamily(family());
const int pointSizeIndex = closestPointSizeIndex(f.pointSize());
m_pointSizeComboBox->setCurrentIndex( pointSizeIndex);
const QString styleString = m_fontDatabase.styleString(f);
const int styleIndex = m_styleComboBox->findText(styleString);
m_styleComboBox->setCurrentIndex(styleIndex);
slotUpdatePreviewFont();
}
QFontDatabase::WritingSystem FontPanel::writingSystem() const
{
const int currentIndex = m_writingSystemComboBox->currentIndex();
if ( currentIndex == -1)
return QFontDatabase::Latin;
return static_cast<QFontDatabase::WritingSystem>(m_writingSystemComboBox->itemData(currentIndex).toInt());
}
QString FontPanel::family() const
{
const int currentIndex = m_familyComboBox->currentIndex();
return currentIndex != -1 ? m_familyComboBox->currentFont().family() : QString();
}
int FontPanel::pointSize() const
{
const int currentIndex = m_pointSizeComboBox->currentIndex();
return currentIndex != -1 ? m_pointSizeComboBox->itemData(currentIndex).toInt() : 9;
}
QString FontPanel::styleString() const
{
const int currentIndex = m_styleComboBox->currentIndex();
return currentIndex != -1 ? m_styleComboBox->itemText(currentIndex) : QString();
}
void FontPanel::setWritingSystem(QFontDatabase::WritingSystem ws)
{
m_writingSystemComboBox->setCurrentIndex(m_writingSystemComboBox->findData(QVariant(ws)));
updateWritingSystem(ws);
}
void FontPanel::slotWritingSystemChanged(int)
{
updateWritingSystem(writingSystem());
delayedPreviewFontUpdate();
}
void FontPanel::slotFamilyChanged(const QFont &)
{
updateFamily(family());
delayedPreviewFontUpdate();
}
void FontPanel::slotStyleChanged(int)
{
updatePointSizes(family(), styleString());
delayedPreviewFontUpdate();
}
void FontPanel::slotPointSizeChanged(int)
{
delayedPreviewFontUpdate();
}
void FontPanel::updateWritingSystem(QFontDatabase::WritingSystem ws)
{
m_previewLineEdit->setText(QFontDatabase::writingSystemSample(ws));
m_familyComboBox->setWritingSystem (ws);
// Current font not in WS ... set index 0.
if (m_familyComboBox->currentIndex() < 0) {
m_familyComboBox->setCurrentIndex(0);
updateFamily(family());
}
}
void FontPanel::updateFamily(const QString &family)
{
// Update styles and trigger update of point sizes.
// Try to maintain selection or select normal
const QString oldStyleString = styleString();
const QStringList styles = m_fontDatabase.styles(family);
const bool hasStyles = !styles.empty();
m_styleComboBox->setCurrentIndex(-1);
m_styleComboBox->clear();
m_styleComboBox->setEnabled(hasStyles);
int normalIndex = -1;
const QString normalStyle = QLatin1String("Normal");
if (hasStyles) {
foreach (const QString &style, styles) {
// try to maintain selection or select 'normal' preferably
const int newIndex = m_styleComboBox->count();
m_styleComboBox->addItem(style);
if (oldStyleString == style) {
m_styleComboBox->setCurrentIndex(newIndex);
} else {
if (oldStyleString == normalStyle)
normalIndex = newIndex;
}
}
if (m_styleComboBox->currentIndex() == -1 && normalIndex != -1)
m_styleComboBox->setCurrentIndex(normalIndex);
}
updatePointSizes(family, styleString());
}
int FontPanel::closestPointSizeIndex(int desiredPointSize) const
{
// try to maintain selection or select closest.
int closestIndex = -1;
int closestAbsError = 0xFFFF;
const int pointSizeCount = m_pointSizeComboBox->count();
for (int i = 0; i < pointSizeCount; i++) {
const int itemPointSize = m_pointSizeComboBox->itemData(i).toInt();
const int absError = qAbs(desiredPointSize - itemPointSize);
if (absError < closestAbsError) {
closestIndex = i;
closestAbsError = absError;
if (closestAbsError == 0)
break;
} else { // past optimum
if (absError > closestAbsError) {
break;
}
}
}
return closestIndex;
}
void FontPanel::updatePointSizes(const QString &family, const QString &styleString)
{
const int oldPointSize = pointSize();
QList<int> pointSizes = m_fontDatabase.pointSizes(family, styleString);
if (pointSizes.empty())
pointSizes = QFontDatabase::standardSizes();
const bool hasSizes = !pointSizes.empty();
m_pointSizeComboBox->clear();
m_pointSizeComboBox->setEnabled(hasSizes);
m_pointSizeComboBox->setCurrentIndex(-1);
// try to maintain selection or select closest.
if (hasSizes) {
QString n;
foreach (int pointSize, pointSizes)
m_pointSizeComboBox->addItem(n.setNum(pointSize), QVariant(pointSize));
const int closestIndex = closestPointSizeIndex(oldPointSize);
if (closestIndex != -1)
m_pointSizeComboBox->setCurrentIndex(closestIndex);
}
}
void FontPanel::slotUpdatePreviewFont()
{
m_previewLineEdit->setFont(selectedFont());
}
void FontPanel::delayedPreviewFontUpdate()
{
if (!m_previewFontUpdateTimer) {
m_previewFontUpdateTimer = new QTimer(this);
connect(m_previewFontUpdateTimer, SIGNAL(timeout()), this, SLOT(slotUpdatePreviewFont()));
m_previewFontUpdateTimer->setInterval(0);
m_previewFontUpdateTimer->setSingleShot(true);
}
if (m_previewFontUpdateTimer->isActive())
return;
m_previewFontUpdateTimer->start();
}
QT_END_NAMESPACE