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

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

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

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

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** this package.

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** packaging of this file.  Please review the following information to

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

#include "qdesigner_menubar_p.h"

#include "qdesigner_menu_p.h"

#include "qdesigner_command_p.h"

#include "qdesigner_propertycommand_p.h"

#include "actionrepository_p.h"

#include "actionprovider_p.h"

#include "actioneditor_p.h"

#include "qdesigner_utils_p.h"

#include "promotiontaskmenu_p.h"

#include "qdesigner_objectinspector_p.h"

#include <QtDesigner/QDesignerFormWindowInterface>

#include <QtDesigner/QDesignerFormEditorInterface>

#include <QtDesigner/QDesignerWidgetFactoryInterface>

#include <QtDesigner/QExtensionManager>

#include <QtCore/QMimeData>

#include <QtCore/qdebug.h>

#include <QtGui/QApplication>

#include <QtGui/QDrag>

#include <QtGui/QLineEdit>

#include <QtGui/QPainter>

#include <QtGui/qevent.h>

Q_DECLARE_METATYPE(QAction*)

QT_BEGIN_NAMESPACE

typedef QList<QAction *> ActionList;

using namespace qdesigner_internal;

namespace qdesigner_internal

{

/////////////////////////////////////////////////////////////////////////////////////////////////////////

SpecialMenuAction::SpecialMenuAction(QObject *parent)

    : QAction(parent)

{

}

SpecialMenuAction::~SpecialMenuAction()

{

}

} // namespace qdesigner_internal

/////////////////////////////////////////////////////////////////////////////////////////////////////////

QDesignerMenuBar::QDesignerMenuBar(QWidget *parent)  :

    QMenuBar(parent),

    m_addMenu(new SpecialMenuAction(this)),

    m_currentIndex(0),

    m_interactive(true),

    m_editor(new QLineEdit(this)),

    m_dragging(false),

    m_lastMenuActionIndex( -1),

    m_promotionTaskMenu(new PromotionTaskMenu(this, PromotionTaskMenu::ModeSingleWidget, this))

{

    setContextMenuPolicy(Qt::DefaultContextMenu);

    setAcceptDrops(true); // ### fake

    // Fake property: Keep the menu bar editable in the form even if a native menu bar is used.

    setNativeMenuBar(false);

    m_addMenu->setText(tr("Type Here"));

    addAction(m_addMenu);

    QFont italic;

    italic.setItalic(true);

    m_addMenu->setFont(italic);

    m_editor->setObjectName(QLatin1String("__qt__passive_editor"));

    m_editor->hide();

    m_editor->installEventFilter(this);

    installEventFilter(this);

}

QDesignerMenuBar::~QDesignerMenuBar()

{

}

void QDesignerMenuBar::paintEvent(QPaintEvent *event)

{

    QMenuBar::paintEvent(event);

    QPainter p(this);

    foreach (QAction *a, actions()) {

        if (qobject_cast<SpecialMenuAction*>(a)) {

            const QRect g = actionGeometry(a);

            QLinearGradient lg(g.left(), g.top(), g.left(), g.bottom());

            lg.setColorAt(0.0, Qt::transparent);

            lg.setColorAt(0.7, QColor(0, 0, 0, 32));

            lg.setColorAt(1.0, Qt::transparent);

            p.fillRect(g, lg);

        }

    }

    QAction *action = currentAction();

    if (m_dragging || !action)

        return;

    if (hasFocus()) {

        const QRect g = actionGeometry(action);

        QDesignerMenu::drawSelection(&p, g.adjusted(1, 1, -1, -1));

    } else if (action->menu() && action->menu()->isVisible()) {

        const QRect g = actionGeometry(action);

        p.drawRect(g.adjusted(1, 1, -1, -1));

    }

}

bool QDesignerMenuBar::handleEvent(QWidget *widget, QEvent *event)

{

    if (!formWindow())

        return false;

    if (event->type() == QEvent::FocusIn || event->type() == QEvent::FocusOut)

        update();

    switch (event->type()) {

        default: break;

        case QEvent::MouseButtonDblClick:

            return handleMouseDoubleClickEvent(widget, static_cast<QMouseEvent*>(event));

        case QEvent::MouseButtonPress:

            return handleMousePressEvent(widget, static_cast<QMouseEvent*>(event));

        case QEvent::MouseButtonRelease:

            return handleMouseReleaseEvent(widget, static_cast<QMouseEvent*>(event));

        case QEvent::MouseMove:

            return handleMouseMoveEvent(widget, static_cast<QMouseEvent*>(event));

        case QEvent::ContextMenu:

            return handleContextMenuEvent(widget, static_cast<QContextMenuEvent*>(event));

        case QEvent::KeyPress:

            return handleKeyPressEvent(widget, static_cast<QKeyEvent*>(event));

        case QEvent::FocusIn:

        case QEvent::FocusOut:

            return widget != m_editor;

    }

    return true;

}

bool QDesignerMenuBar::handleMouseDoubleClickEvent(QWidget *, QMouseEvent *event)

{

    if (!rect().contains(event->pos()))

        return true;

    if ((event->buttons() & Qt::LeftButton) != Qt::LeftButton)

        return true;

    event->accept();

    m_startPosition = QPoint();

    m_currentIndex = actionIndexAt(this, event->pos(), Qt::Horizontal);

    if (m_currentIndex != -1) {

        showLineEdit();

    }

    return true;

}

bool QDesignerMenuBar::handleKeyPressEvent(QWidget *, QKeyEvent *e)

{

    if (m_editor->isHidden()) { // In navigation mode

        switch (e->key()) {

        case Qt::Key_Delete:

            if (m_currentIndex == -1 || m_currentIndex >= realActionCount())

                break;

            hideMenu();

            deleteMenu();

            break;

        case Qt::Key_Left:

            e->accept();

            moveLeft(e->modifiers() & Qt::ControlModifier);

            return true;

        case Qt::Key_Right:

            e->accept();

            moveRight(e->modifiers() & Qt::ControlModifier);

            return true; // no update

        case Qt::Key_Up:

            e->accept();

            moveUp();

            return true;

        case Qt::Key_Down:

            e->accept();

            moveDown();

            return true;

        case Qt::Key_PageUp:

            m_currentIndex = 0;

            break;

        case Qt::Key_PageDown:

            m_currentIndex = actions().count() - 1;

            break;

        case Qt::Key_Enter:

        case Qt::Key_Return:

            e->accept();

            enterEditMode();

            return true; // no update

        case Qt::Key_Alt:

        case Qt::Key_Shift:

        case Qt::Key_Control:

        case Qt::Key_Escape:

            e->ignore();

            setFocus(); // FIXME: this is because some other widget get the focus when CTRL is pressed

            return true; // no update

        default:

            if (!e->text().isEmpty() && e->text().at(0).toLatin1() >= 32) {

                showLineEdit();

                QApplication::sendEvent(m_editor, e);

                e->accept();

            } else {

                e->ignore();

            }

            return true;

        }

    } else { // In edit mode

        switch (e->key()) {

        default:

            return false;

        case Qt::Key_Control:

            e->ignore();

            return true;

        case Qt::Key_Enter:

        case Qt::Key_Return:

            if (!m_editor->text().isEmpty()) {

                leaveEditMode(ForceAccept);

                if (m_lastFocusWidget)

                    m_lastFocusWidget->setFocus();

                m_editor->hide();

                showMenu();

                break;

            }

            // fall through

        case Qt::Key_Escape:

            update();

            setFocus();

            break;

        }

    }

    e->accept();

    update();

    return true;

}

void QDesignerMenuBar::startDrag(const QPoint &pos)

{

    const int index = findAction(pos);

    if (m_currentIndex == -1 || index >= realActionCount())

        return;

    QAction *action = safeActionAt(index);

    QDesignerFormWindowInterface *fw = formWindow();

    RemoveActionFromCommand *cmd = new RemoveActionFromCommand(fw);

    cmd->init(this, action, actions().at(index + 1));

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

    adjustSize();

    hideMenu(index);

    QDrag *drag = new QDrag(this);

    drag->setPixmap(ActionRepositoryMimeData::actionDragPixmap(action));

    drag->setMimeData(new ActionRepositoryMimeData(action, Qt::MoveAction));

    const int old_index = m_currentIndex;

    m_currentIndex = -1;

    if (drag->start(Qt::MoveAction) == Qt::IgnoreAction) {

        InsertActionIntoCommand *cmd = new InsertActionIntoCommand(fw);

        cmd->init(this, action, safeActionAt(index));

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

        m_currentIndex = old_index;

        adjustSize();

    }

}

bool QDesignerMenuBar::handleMousePressEvent(QWidget *, QMouseEvent *event)

{

    m_startPosition = QPoint();

    event->accept();

    if (event->button() != Qt::LeftButton)

        return true;

    m_startPosition = event->pos();

    const int newIndex = actionIndexAt(this, m_startPosition, Qt::Horizontal);

    const bool changed = newIndex != m_currentIndex;

    m_currentIndex =  newIndex;

    updateCurrentAction(changed);

    return true;

}

bool QDesignerMenuBar::handleMouseReleaseEvent(QWidget *, QMouseEvent *event)

{

    m_startPosition = QPoint();

    if (event->button() != Qt::LeftButton)

        return true;

    event->accept();

    m_currentIndex = actionIndexAt(this, event->pos(), Qt::Horizontal);

    if (!m_editor->isVisible() && m_currentIndex != -1 && m_currentIndex < realActionCount())

        showMenu();

    return true;

}

bool QDesignerMenuBar::handleMouseMoveEvent(QWidget *, QMouseEvent *event)

{

    if ((event->buttons() & Qt::LeftButton) != Qt::LeftButton)

        return true;

    if (m_startPosition.isNull())

        return true;

    const QPoint pos = mapFromGlobal(event->globalPos());

    if ((pos - m_startPosition).manhattanLength() < qApp->startDragDistance())

        return true;

    const int index =  actionIndexAt(this, m_startPosition, Qt::Horizontal);

    if (index < actions().count()) {

        hideMenu(index);

        update();

    }

    startDrag(m_startPosition);

    m_startPosition = QPoint();

    return true;

}

ActionList QDesignerMenuBar::contextMenuActions()

{

    ActionList rc;

    if (QAction *action = safeActionAt(m_currentIndex)) {

        if (!qobject_cast<SpecialMenuAction*>(action)) {

            QVariant itemData;

            qVariantSetValue(itemData, action);

            QAction *remove_action = new QAction(tr("Remove Menu '%1'").arg(action->menu()->objectName()), 0);

            remove_action->setData(itemData);

            connect(remove_action, SIGNAL(triggered()), this, SLOT(deleteMenu()));

            rc.push_back(remove_action);

            QAction *sep = new QAction(0);

            sep->setSeparator(true);

            rc.push_back(sep);

        }

    }

    m_promotionTaskMenu->addActions(formWindow(), PromotionTaskMenu::TrailingSeparator, rc);

    QAction *remove_menubar = new QAction(tr("Remove Menu Bar"), 0);

    connect(remove_menubar, SIGNAL(triggered()), this, SLOT(slotRemoveMenuBar()));

    rc.push_back(remove_menubar);

    return rc;

}

bool QDesignerMenuBar::handleContextMenuEvent(QWidget *, QContextMenuEvent *event)

{

    event->accept();

    m_currentIndex = actionIndexAt(this, mapFromGlobal(event->globalPos()), Qt::Horizontal);

    update();

    QMenu menu;

    const ActionList al = contextMenuActions();

    const ActionList::const_iterator acend = al.constEnd();

    for (ActionList::const_iterator it =  al.constBegin(); it != acend; ++it)

        menu.addAction(*it);

    menu.exec(event->globalPos());

    return true;

}

void QDesignerMenuBar::slotRemoveMenuBar()

{

    Q_ASSERT(formWindow() != 0);

    QDesignerFormWindowInterface *fw = formWindow();

    DeleteMenuBarCommand *cmd = new DeleteMenuBarCommand(fw);

    cmd->init(this);

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

}

void QDesignerMenuBar::focusOutEvent(QFocusEvent *event)

{

    QMenuBar::focusOutEvent(event);

}

void QDesignerMenuBar::enterEditMode()

{

    if (m_currentIndex >= 0 && m_currentIndex <= realActionCount()) {

        showLineEdit();

    }

}

void QDesignerMenuBar::leaveEditMode(LeaveEditMode mode)

{

    m_editor->releaseKeyboard();

    if (mode == Default)

        return;

    if (m_editor->text().isEmpty())

        return;

    QAction *action = 0;

    QDesignerFormWindowInterface *fw = formWindow();

    Q_ASSERT(fw);

    if (m_currentIndex >= 0 && m_currentIndex < realActionCount()) {

        action = safeActionAt(m_currentIndex);

        fw->beginCommand(QApplication::translate("Command", "Change Title"));

    } else {

        fw->beginCommand(QApplication::translate("Command", "Insert Menu"));

        const QString niceObjectName = ActionEditor::actionTextToName(m_editor->text(), QLatin1String("menu"));

        QMenu *menu = qobject_cast<QMenu*>(fw->core()->widgetFactory()->createWidget(QLatin1String("QMenu"), this));

        fw->core()->widgetFactory()->initialize(menu);

        menu->setObjectName(niceObjectName);

        menu->setTitle(tr("Menu"));

        fw->ensureUniqueObjectName(menu);

        action = menu->menuAction();

        AddMenuActionCommand *cmd = new AddMenuActionCommand(fw);

        cmd->init(action, m_addMenu, this, this);

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

    }

    SetPropertyCommand *cmd = new SetPropertyCommand(fw);

    cmd->init(action, QLatin1String("text"), m_editor->text());

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

    fw->endCommand();

}

void QDesignerMenuBar::showLineEdit()

{

    QAction *action = 0;

    if (m_currentIndex >= 0 && m_currentIndex < realActionCount())

        action = safeActionAt(m_currentIndex);

    else

        action = m_addMenu;

    if (action->isSeparator())

        return;

    // hideMenu();

    m_lastFocusWidget = qApp->focusWidget();

    // open edit field for item name

    const QString text = action != m_addMenu ? action->text() : QString();

    m_editor->setText(text);

    m_editor->selectAll();

    m_editor->setGeometry(actionGeometry(action));

    m_editor->show();

    qApp->setActiveWindow(m_editor);

    m_editor->setFocus();