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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QApplication>
#include <QWidget>
#include <QStackedWidget>
#include <QTabBar>
#include <QLabel>
#include <QLayout>
#include <QTabWidget>
#include <QProxyStyle>
#include <qdebug.h>
#include "tabbarform.h"
class TabBarProxyStyle : public QProxyStyle
{
public:
TabBarProxyStyle() : QProxyStyle(), alignment(Qt::AlignLeft)
{ }
int styleHint(StyleHint hint, const QStyleOption *option = 0,
const QWidget *widget = 0, QStyleHintReturn *returnData = 0) const
{
if (hint == QStyle::SH_TabBar_Alignment)
return alignment;
return QProxyStyle::styleHint(hint, option, widget, returnData);
}
Qt::Alignment alignment;
};
const int TabCount = 5;
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
auto *proxyStyle = new TabBarProxyStyle;
app.setStyle(proxyStyle);
QWidget widget;
QStackedWidget stackedWidget;
QTabBar tabBar;
tabBar.setDocumentMode(true);
tabBar.setTabsClosable(true);
tabBar.setMovable(true);
tabBar.setExpanding(false);
// top
tabBar.setShape(QTabBar::RoundedNorth);
// bottom
// tabBar.setShape(QTabBar::RoundedSouth);
// left
// tabBar.setShape(QTabBar::RoundedWest);
// right
// tabBar.setShape(QTabBar::RoundedEast);
const auto shortLabel = QStringLiteral("Tab %1");
const auto longLabel = QStringLiteral("An Extremely Long Tab Label %1");
QMap<int, QWidget*> tabs;
for (int i = 0; i < TabCount; i++) {
QString tabNumberString = QString::number(i);
QLabel *label = new QLabel(QStringLiteral("Tab %1 content").arg(tabNumberString));
tabs[i] = label;
label->setAlignment(Qt::AlignCenter);
stackedWidget.addWidget(label);
tabBar.addTab(shortLabel.arg(tabNumberString));
}
QObject::connect(&tabBar, &QTabBar::tabMoved, [&tabs](int from, int to) {
QWidget *thisWidget = tabs[from];
QWidget *thatWidget = tabs[to];
tabs[from] = thatWidget;
tabs[to] = thisWidget;
});
QObject::connect(&tabBar, &QTabBar::currentChanged, [&stackedWidget, &tabs](int index) {
if (index >= 0)
stackedWidget.setCurrentWidget(tabs[index]);
});
QObject::connect(&tabBar, &QTabBar::tabCloseRequested, [&stackedWidget, &tabBar, &tabs](int index) {
QWidget *widget = tabs[index];
tabBar.removeTab(index);
for (int i = index + 1; i < TabCount; i++)
tabs[i-1] = tabs[i];
int currentIndex = tabBar.currentIndex();
if (currentIndex >= 0)
stackedWidget.setCurrentWidget(tabs[currentIndex]);
delete widget;
});
QLayout *layout;
switch (tabBar.shape()) {
case QTabBar::RoundedEast:
case QTabBar::TriangularEast:
tabBar.setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding);
layout = new QHBoxLayout(&widget);
layout->addWidget(&stackedWidget);
layout->addWidget(&tabBar);
break;
case QTabBar::RoundedWest:
case QTabBar::TriangularWest:
tabBar.setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding);
layout = new QHBoxLayout(&widget);
layout->addWidget(&tabBar);
layout->addWidget(&stackedWidget);
break;
case QTabBar::RoundedNorth:
case QTabBar::TriangularNorth:
tabBar.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Minimum);
layout = new QVBoxLayout(&widget);
layout->addWidget(&tabBar);
layout->addWidget(&stackedWidget);
break;
case QTabBar::RoundedSouth:
case QTabBar::TriangularSouth:
tabBar.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Minimum);
layout = new QVBoxLayout(&widget);
layout->addWidget(&stackedWidget);
layout->addWidget(&tabBar);
break;
}
TabBarForm form;
layout->addWidget(&form);
layout->setAlignment(&form, Qt::AlignHCenter);
form.ui->documentModeButton->setChecked(tabBar.documentMode());
QObject::connect(form.ui->documentModeButton, &QCheckBox::toggled, [&] {
tabBar.setDocumentMode(form.ui->documentModeButton->isChecked());
// QMacStyle (and maybe other styles) requires a re-polish to get the right font
QApplication::sendEvent(&tabBar, new QEvent(QEvent::ThemeChange));
});
form.ui->movableTabsButton->setChecked(tabBar.isMovable());
QObject::connect(form.ui->movableTabsButton, &QCheckBox::toggled, [&] {
tabBar.setMovable(form.ui->movableTabsButton->isChecked());
tabBar.update();
});
form.ui->closableTabsButton->setChecked(tabBar.tabsClosable());
QObject::connect(form.ui->closableTabsButton, &QCheckBox::toggled, [&] {
tabBar.setTabsClosable(form.ui->closableTabsButton->isChecked());
tabBar.update();
});
form.ui->expandingTabsButton->setChecked(tabBar.expanding());
QObject::connect(form.ui->expandingTabsButton, &QCheckBox::toggled, [&] {
tabBar.setExpanding(form.ui->expandingTabsButton->isChecked());
tabBar.update();
});
form.ui->displayIconButton->setChecked(!tabBar.tabIcon(0).isNull());
QObject::connect(form.ui->displayIconButton, &QCheckBox::toggled, [&] {
const auto icon = form.ui->displayIconButton->isChecked() ?
tabBar.style()->standardIcon(QStyle::SP_ComputerIcon) : QIcon();
for (int i = 0; i < tabBar.count(); i++)
tabBar.setTabIcon(i, icon);
});
form.ui->longLabelButton->setChecked(false);
QObject::connect(form.ui->longLabelButton, &QCheckBox::toggled, [&] {
const auto &label = form.ui->longLabelButton->isChecked() ? longLabel : shortLabel;
for (int i = 0; i < tabBar.count(); i++)
tabBar.setTabText(i, label.arg(i));
});
QObject::connect(form.ui->shapeComboBox, QOverload<int>::of(&QComboBox::currentIndexChanged), [&](int index) {
Q_UNUSED(index);
// TODO
});
if (proxyStyle->alignment == Qt::AlignLeft)
form.ui->leftAlignedButton->setChecked(true);
else if (proxyStyle->alignment == Qt::AlignRight)
form.ui->rightAlignedButton->setChecked(true);
else
form.ui->centeredButton->setChecked(true);
QObject::connect(form.ui->textAlignmentGroup, QOverload<QAbstractButton *>::of(&QButtonGroup::buttonClicked), [&](QAbstractButton *b) {
proxyStyle->alignment = b == form.ui->leftAlignedButton ? Qt::AlignLeft :
b == form.ui->rightAlignedButton ? Qt::AlignRight : Qt::AlignCenter;
QApplication::sendEvent(&tabBar, new QEvent(QEvent::StyleChange));
});
layout->setContentsMargins(12, 12, 12, 12);
widget.show();
return app.exec();
}
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