/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the Qt Designer of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** 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

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include "qdesigner_stackedbox_p.h"

#include "qdesigner_command_p.h"

#include "qdesigner_propertycommand_p.h"

#include "orderdialog_p.h"

#include "promotiontaskmenu_p.h"

#include "widgetfactory_p.h"

#include <QtDesigner/QDesignerFormWindowInterface>

#include <QtGui/QToolButton>

#include <QtGui/QAction>

#include <QtGui/qevent.h>

#include <QtGui/QMenu>

#include <QtGui/QStackedWidget>

#include <QtCore/QDebug>

QT_BEGIN_NAMESPACE

static QToolButton *createToolButton(QWidget *parent, Qt::ArrowType at, const QString &name) {

    QToolButton *rc =  new QToolButton();

    rc->setAttribute(Qt::WA_NoChildEventsForParent, true);

    rc->setParent(parent);

    rc->setObjectName(name);

    rc->setArrowType(at);

    rc->setAutoRaise(true);

    rc->setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed));

    rc->setFixedSize(QSize(15, 15));

    return rc;

}

// ---------------  QStackedWidgetPreviewEventFilter

QStackedWidgetPreviewEventFilter::QStackedWidgetPreviewEventFilter(QStackedWidget *parent) :

    QObject(parent),

    m_buttonToolTipEnabled(false), // Not on preview

    m_stackedWidget(parent),

    m_prev(createToolButton(m_stackedWidget, Qt::LeftArrow,  QLatin1String("__qt__passive_prev"))),

    m_next(createToolButton(m_stackedWidget, Qt::RightArrow, QLatin1String("__qt__passive_next")))

{

    connect(m_prev, SIGNAL(clicked()), this, SLOT(prevPage()));

    connect(m_next, SIGNAL(clicked()), this, SLOT(nextPage()));

    updateButtons();

    m_stackedWidget->installEventFilter(this);

    m_prev->installEventFilter(this);

    m_next->installEventFilter(this);

}

void QStackedWidgetPreviewEventFilter::install(QStackedWidget *stackedWidget)

{

    new QStackedWidgetPreviewEventFilter(stackedWidget);

}

void QStackedWidgetPreviewEventFilter::updateButtons()

{

    m_prev->move(m_stackedWidget->width() - 31, 1);

    m_prev->show();

    m_prev->raise();

    m_next->move(m_stackedWidget->width() - 16, 1);

    m_next->show();

    m_next->raise();

}

void QStackedWidgetPreviewEventFilter::prevPage()

{

    if (QDesignerFormWindowInterface *fw = QDesignerFormWindowInterface::findFormWindow(stackedWidget())) {

        fw->clearSelection();

        fw->selectWidget(stackedWidget(), true);

    }

    const int count = m_stackedWidget->count();

    if (count > 1) {

        int newIndex = m_stackedWidget->currentIndex() - 1;

        if (newIndex < 0)

            newIndex = count - 1;

        gotoPage(newIndex);

    }

}

void QStackedWidgetPreviewEventFilter::nextPage()

{

    if (QDesignerFormWindowInterface *fw = QDesignerFormWindowInterface::findFormWindow(stackedWidget())) {

        fw->clearSelection();

        fw->selectWidget(stackedWidget(), true);

    }

    const int count = m_stackedWidget->count();

    if (count > 1)

        gotoPage((m_stackedWidget->currentIndex() + 1) % count);

}

bool QStackedWidgetPreviewEventFilter::eventFilter(QObject *watched, QEvent *event)

{

    if (watched->isWidgetType()) {

        if (watched == m_stackedWidget) {

            switch (event->type()) {

            case QEvent::LayoutRequest:

                updateButtons();

                break;

            case QEvent::ChildAdded:

            case QEvent::ChildRemoved:

            case QEvent::Resize:

            case QEvent::Show:

                updateButtons();

                break;

            default:

                break;

            }

        }

        if (m_buttonToolTipEnabled && (watched == m_next || watched == m_prev)) {

            switch (event->type()) {

            case QEvent::ToolTip:

                updateButtonToolTip(watched); // Tooltip includes page number, so, refresh on demand

                break;

            default:

                break;

            }

        }

    }

    return QObject::eventFilter(watched, event);

}

void QStackedWidgetPreviewEventFilter::gotoPage(int page)

{

    m_stackedWidget->setCurrentIndex(page);

    updateButtons();

}

static inline QString stackedClassName(QStackedWidget *w)

{

    if (const QDesignerFormWindowInterface *fw = QDesignerFormWindowInterface::findFormWindow(w))

        return qdesigner_internal::WidgetFactory::classNameOf(fw->core(), w);

    return QLatin1String("Stacked widget");

}

void QStackedWidgetPreviewEventFilter::updateButtonToolTip(QObject *o)

{

    QString className = QLatin1String("Stacked widget");

    if (const QDesignerFormWindowInterface *fw = QDesignerFormWindowInterface::findFormWindow(m_stackedWidget))

        className = qdesigner_internal::WidgetFactory::classNameOf(fw->core(), m_stackedWidget);

    if (o == m_prev) {

        const QString msg = tr("Go to previous page of %1 '%2' (%3/%4).").arg(stackedClassName(m_stackedWidget)).arg(m_stackedWidget->objectName()).arg(m_stackedWidget->currentIndex() + 1).arg(m_stackedWidget->count());

        m_prev->setToolTip(msg);

    } else {

        if (o == m_next) {

            const QString msg = tr("Go to next page of %1 '%2' (%3/%4).").arg(stackedClassName(m_stackedWidget)).arg(m_stackedWidget->objectName()).arg(m_stackedWidget->currentIndex() + 1).arg(m_stackedWidget->count());

            m_next->setToolTip(msg);

        }

    }

}

// ---------------  QStackedWidgetEventFilter

QStackedWidgetEventFilter::QStackedWidgetEventFilter(QStackedWidget *parent) :

    QStackedWidgetPreviewEventFilter(parent),

    m_actionPreviousPage(new QAction(tr("Previous Page"), this)),

    m_actionNextPage(new QAction(tr("Next Page"), this)),

    m_actionDeletePage(new QAction(tr("Delete"), this)),

    m_actionInsertPage(new QAction(tr("Before Current Page"), this)),

    m_actionInsertPageAfter(new QAction(tr("After Current Page"), this)),

    m_actionChangePageOrder(new QAction(tr("Change Page Order..."), this)),

    m_pagePromotionTaskMenu(new qdesigner_internal::PromotionTaskMenu(0, qdesigner_internal::PromotionTaskMenu::ModeSingleWidget, this))

{

    setButtonToolTipEnabled(true);

    connect(m_actionPreviousPage, SIGNAL(triggered()), this, SLOT(prevPage()));

    connect(m_actionNextPage, SIGNAL(triggered()), this, SLOT(nextPage()));

    connect(m_actionDeletePage, SIGNAL(triggered()), this, SLOT(removeCurrentPage()));

    connect(m_actionInsertPage, SIGNAL(triggered()), this, SLOT(addPage()));

    connect(m_actionInsertPageAfter, SIGNAL(triggered()), this, SLOT(addPageAfter()));

    connect(m_actionChangePageOrder, SIGNAL(triggered()), this, SLOT(changeOrder()));

}

void QStackedWidgetEventFilter::install(QStackedWidget *stackedWidget)

{

    new QStackedWidgetEventFilter(stackedWidget);

}

QStackedWidgetEventFilter *QStackedWidgetEventFilter::eventFilterOf(const QStackedWidget *stackedWidget)

{

    // Look for 1st order children only..otherwise, we might get filters of nested widgets

    const QObjectList children = stackedWidget->children();

    const QObjectList::const_iterator cend = children.constEnd();

    for (QObjectList::const_iterator it = children.constBegin(); it != cend; ++it) {

        QObject *o = *it;

        if (!o->isWidgetType())

            if (QStackedWidgetEventFilter *ef = qobject_cast<QStackedWidgetEventFilter *>(o))

                return ef;

    }

    return 0;

}

QMenu *QStackedWidgetEventFilter::addStackedWidgetContextMenuActions(const QStackedWidget *stackedWidget, QMenu *popup)

{

    QStackedWidgetEventFilter *filter = eventFilterOf(stackedWidget);

    if (!filter)

        return 0;

    return filter->addContextMenuActions(popup);

}

void QStackedWidgetEventFilter::removeCurrentPage()

{

    if (stackedWidget()->currentIndex() == -1)

        return;

    if (QDesignerFormWindowInterface *fw = QDesignerFormWindowInterface::findFormWindow(stackedWidget())) {

        qdesigner_internal::DeleteStackedWidgetPageCommand *cmd = new qdesigner_internal::DeleteStackedWidgetPageCommand(fw);

        cmd->init(stackedWidget());

        fw->commandHistory()->push(cmd);

    }

}

void QStackedWidgetEventFilter::changeOrder()

{

    QDesignerFormWindowInterface *fw = QDesignerFormWindowInterface::findFormWindow(stackedWidget());

    if (!fw)

        return;

    const QWidgetList oldPages = qdesigner_internal::OrderDialog::pagesOfContainer(fw->core(), stackedWidget());

    const int pageCount = oldPages.size();

    if (pageCount < 2)

        return;

    qdesigner_internal::OrderDialog dlg(fw);

    dlg.setPageList(oldPages);

    if (dlg.exec() == QDialog::Rejected)

        return;

    const QWidgetList newPages = dlg.pageList();

    if (newPages == oldPages)

        return;

    fw->beginCommand(tr("Change Page Order"));

    for(int i=0; i < pageCount; ++i) {

        if (newPages.at(i) == stackedWidget()->widget(i))

            continue;

        qdesigner_internal::MoveStackedWidgetCommand *cmd = new qdesigner_internal::MoveStackedWidgetCommand(fw);

        cmd->init(stackedWidget(), newPages.at(i), i);

        fw->commandHistory()->push(cmd);

    }

    fw->endCommand();

}

void QStackedWidgetEventFilter::addPage()

{

    if (QDesignerFormWindowInterface *fw = QDesignerFormWindowInterface::findFormWindow(stackedWidget())) {

        qdesigner_internal::AddStackedWidgetPageCommand *cmd = new qdesigner_internal::AddStackedWidgetPageCommand(fw);

        cmd->init(stackedWidget(), qdesigner_internal::AddStackedWidgetPageCommand::InsertBefore);

        fw->commandHistory()->push(cmd);

    }

}

void QStackedWidgetEventFilter::addPageAfter()

{

    if (QDesignerFormWindowInterface *fw = QDesignerFormWindowInterface::findFormWindow(stackedWidget())) {

        qdesigner_internal::AddStackedWidgetPageCommand *cmd = new qdesigner_internal::AddStackedWidgetPageCommand(fw);

        cmd->init(stackedWidget(), qdesigner_internal::AddStackedWidgetPageCommand::InsertAfter);

        fw->commandHistory()->push(cmd);

    }

}

void QStackedWidgetEventFilter::gotoPage(int page) {

    // Are we on a form or in a preview?

    if (QDesignerFormWindowInterface *fw = QDesignerFormWindowInterface::findFormWindow(stackedWidget())) {

        qdesigner_internal::SetPropertyCommand *cmd = new  qdesigner_internal::SetPropertyCommand(fw);

        cmd->init(stackedWidget(), QLatin1String("currentIndex"), page);

        fw->commandHistory()->push(cmd);

        fw->emitSelectionChanged(); // Magically prevent an endless loop triggered by auto-repeat.

        updateButtons();

    } else {

        QStackedWidgetPreviewEventFilter::gotoPage(page);

    }

}

QMenu *QStackedWidgetEventFilter::addContextMenuActions(QMenu *popup)

{

    QMenu *pageMenu = 0;

    const int count = stackedWidget()->count();

    const bool hasSeveralPages = count > 1;

    m_actionDeletePage->setEnabled(count);

    if (count) {

        const QString pageSubMenuLabel = tr("Page %1 of %2").arg(stackedWidget()->currentIndex() + 1).arg(count);

        pageMenu = popup->addMenu(pageSubMenuLabel);

        pageMenu->addAction(m_actionDeletePage);

        // Set up promotion menu for current widget.

        if (QWidget *page =  stackedWidget()->currentWidget ()) {

            m_pagePromotionTaskMenu->setWidget(page);

            m_pagePromotionTaskMenu->addActions(QDesignerFormWindowInterface::findFormWindow(stackedWidget()),

                                                qdesigner_internal::PromotionTaskMenu::SuppressGlobalEdit,

                                                pageMenu);

        }

        QMenu *insertPageMenu = popup->addMenu(tr("Insert Page"));

        insertPageMenu->addAction(m_actionInsertPageAfter);

        insertPageMenu->addAction(m_actionInsertPage);

    } else {

        QAction *insertPageAction = popup->addAction(tr("Insert Page"));

        connect(insertPageAction, SIGNAL(triggered()), this, SLOT(addPage()));

    }

    popup->addAction(m_actionNextPage);

    m_actionNextPage->setEnabled(hasSeveralPages);

    popup->addAction(m_actionPreviousPage);

    m_actionPreviousPage->setEnabled(hasSeveralPages);

    popup->addAction(m_actionChangePageOrder);

    m_actionChangePageOrder->setEnabled(hasSeveralPages);

    popup->addSeparator();

    return pageMenu;

}

// --------  QStackedWidgetPropertySheet

static const char *pagePropertyName = "currentPageName";

QStackedWidgetPropertySheet::QStackedWidgetPropertySheet(QStackedWidget *object, QObject *parent) :

    QDesignerPropertySheet(object, parent),

    m_stackedWidget(object)

{

    createFakeProperty(QLatin1String(pagePropertyName), QString());

}

bool QStackedWidgetPropertySheet::isEnabled(int index) const

{

    if (propertyName(index) != QLatin1String(pagePropertyName))

        return QDesignerPropertySheet::isEnabled(index);

    return  m_stackedWidget->currentWidget() != 0;

}

void QStackedWidgetPropertySheet::setProperty(int index, const QVariant &value)

{

    if (propertyName(index) == QLatin1String(pagePropertyName)) {

        if (QWidget *w = m_stackedWidget->currentWidget())

            w->setObjectName(value.toString());

    } else {

        QDesignerPropertySheet::setProperty(index, value);

    }

}

QVariant QStackedWidgetPropertySheet::property(int index) const

{

    if (propertyName(index) == QLatin1String(pagePropertyName)) {

        if (const QWidget *w = m_stackedWidget->currentWidget())

            return w->objectName();

        return QString();

    }

    return QDesignerPropertySheet::property(index);

}

bool QStackedWidgetPropertySheet::reset(int index)

{

    if (propertyName(index) == QLatin1String(pagePropertyName)) {

        setProperty(index, QString());

        return true;

    }

    return QDesignerPropertySheet::reset(index);

}

bool QStackedWidgetPropertySheet::checkProperty(const QString &propertyName)

{

    return propertyName != QLatin1String(pagePropertyName);

}

QT_END_NAMESPACE