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

**

** 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 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.

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** $QT_END_LICENSE$

**

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

#include "qdesigner_menu_p.h"

#include "qdesigner_menubar_p.h"

#include "qdesigner_toolbar_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 "qdesigner_objectinspector_p.h"

#include <QtCore/QTimer>

#include <QtCore/qdebug.h>

#include <QtDesigner/QDesignerFormEditorInterface>

#include <QtDesigner/QDesignerWidgetFactoryInterface>

#include <QtDesigner/QDesignerMetaDataBaseInterface>

#include <QtDesigner/QExtensionManager>

#include <QtGui/QAction>

#include <QtGui/QApplication>

#include <QtGui/QLineEdit>

#include <QtGui/QPainter>

#include <QtGui/QRubberBand>

#include <QtGui/QToolTip>

#include <QtGui/QToolBar>

#include <QtGui/qevent.h>

Q_DECLARE_METATYPE(QAction*)

QT_BEGIN_NAMESPACE

using namespace qdesigner_internal;

// give the user a little more space to click on the sub menu rectangle

static inline void extendClickableArea(QRect *subMenuRect, Qt::LayoutDirection dir)

{

    switch (dir) {

    case Qt::LeftToRight:

        subMenuRect->setLeft(subMenuRect->left() - 20);

        break;

    case Qt::RightToLeft:

        subMenuRect->setRight(subMenuRect->right() + 20);

        break;

    }

}

QDesignerMenu::QDesignerMenu(QWidget *parent) :

    QMenu(parent),

    m_subMenuPixmap(QPixmap(QLatin1String(":/trolltech/formeditor/images/submenu.png"))),

    m_currentIndex(0),

    m_addItem(new SpecialMenuAction(this)),

    m_addSeparator(new SpecialMenuAction(this)),

    m_showSubMenuTimer(new QTimer(this)),

    m_deactivateWindowTimer(new QTimer(this)),

    m_adjustSizeTimer(new QTimer(this)),

    m_editor(new QLineEdit(this)),

    m_dragging(false),

    m_lastSubMenuIndex(-1)

{

    setContextMenuPolicy(Qt::DefaultContextMenu);

    setAcceptDrops(true); // ### fake

    setSeparatorsCollapsible(false);

    connect(m_adjustSizeTimer, SIGNAL(timeout()), this, SLOT(slotAdjustSizeNow()));

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

    addAction(m_addItem);

    m_addSeparator->setText(tr("Add Separator"));

    addAction(m_addSeparator);

    connect(m_showSubMenuTimer, SIGNAL(timeout()), this, SLOT(slotShowSubMenuNow()));

    connect(m_deactivateWindowTimer, SIGNAL(timeout()), this, SLOT(slotDeactivateNow()));

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

    m_editor->hide();

    m_editor->installEventFilter(this);

    installEventFilter(this);

}

QDesignerMenu::~QDesignerMenu()

{

}

void QDesignerMenu::slotAdjustSizeNow()

{

    // Not using a single-shot, since we want to compress the timers if many items are being

    // adjusted

    m_adjustSizeTimer->stop();

    adjustSize();

}

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

{

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

        update();

        if (widget == m_editor)

            return false;

    }

    switch (event->type()) {

        default: break;

        case QEvent::MouseButtonPress:

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

        case QEvent::MouseButtonRelease:

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

        case QEvent::MouseButtonDblClick:

            return handleMouseDoubleClickEvent(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));

    }

    return true;

}

void QDesignerMenu::startDrag(const QPoint &pos, Qt::KeyboardModifiers modifiers)

{

    const int index = findAction(pos);

    if (index >= realActionCount())

        return;

    QAction *action = safeActionAt(index);

    QDesignerFormWindowInterface *fw = formWindow();

    const Qt::DropAction dropAction = (modifiers & Qt::ControlModifier) ? Qt::CopyAction : Qt::MoveAction;

    if (dropAction == Qt::MoveAction) {

        RemoveActionFromCommand *cmd = new RemoveActionFromCommand(fw);

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

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

    }

    QDrag *drag = new QDrag(this);

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

    drag->setMimeData(new ActionRepositoryMimeData(action, dropAction));

    const int old_index = m_currentIndex;

    m_currentIndex = -1;

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

        if (dropAction == Qt::MoveAction) {

            QAction *previous = safeActionAt(index);

            InsertActionIntoCommand *cmd = new InsertActionIntoCommand(fw);

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

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

        }

        m_currentIndex = old_index;

    }

}

bool QDesignerMenu::handleKeyPressEvent(QWidget * /*widget*/, QKeyEvent *e)

{

    m_showSubMenuTimer->stop();

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

        switch (e->key()) {

        case Qt::Key_Delete:

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

                break;

            hideSubMenu();

            deleteAction();

            break;

        case Qt::Key_Left:

            e->accept();

            moveLeft();

            return true;

        case Qt::Key_Right:

            e->accept();

            moveRight();

            return true; // no update

        case Qt::Key_Up:

            e->accept();

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

            return true;

        case Qt::Key_Down:

            e->accept();

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

            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:

        case Qt::Key_F2:

            e->accept();

            enterEditMode();

            return true; // no update

        case Qt::Key_Escape:

            e->ignore();

            setFocus();

            hide();

            closeMenuChain();

            return true;

        case Qt::Key_Alt:

        case Qt::Key_Shift:

        case Qt::Key_Control:

            e->ignore();

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

            return true; // no update

        default: {

            QAction *action = currentAction();

            if (!action || action->isSeparator() || action == m_addSeparator) {

                e->ignore();

                return true;

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

                showLineEdit();

                QApplication::sendEvent(m_editor, e);

                e->accept();

            } else {

                e->ignore();

            }

        }

            return true;

        }

    } else if (m_editor->hasFocus()) { // In edit mode

        switch (e->key()) {

        default:

            e->ignore();

            return false;

        case Qt::Key_Enter:

        case Qt::Key_Return:

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

                leaveEditMode(ForceAccept);

                m_editor->hide();

                setFocus();

                moveDown(false);

                break;

            }

            // fall through

        case Qt::Key_Escape:

            m_editor->hide();

            setFocus();

            break;

        }

    }

    e->accept();

    update();

    return true;

}

static void sendMouseEventTo(QWidget *target, const QPoint &targetPoint, const QMouseEvent *event)

{

    QMouseEvent e(event->type(), targetPoint, event->globalPos(), event->button(), event->buttons(), event->modifiers());

    QApplication::sendEvent(target, &e);

}

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

{

    event->accept();

    m_startPosition = QPoint();

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

        return true;

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

        // special case for menubar

        QWidget *target = QApplication::widgetAt(event->globalPos());

        QMenuBar *mb = qobject_cast<QMenuBar*>(target);

        QDesignerMenu *menu = qobject_cast<QDesignerMenu*>(target);

        if (mb != 0 || menu != 0) {

            const QPoint pt = target->mapFromGlobal(event->globalPos());

            QAction *action = mb == 0 ? menu->actionAt(pt) : mb->actionAt(pt);

            if (action)

                 sendMouseEventTo(target, pt, event);

        }

        return true;

    }

    m_currentIndex = findAction(event->pos());

    QAction *action = safeActionAt(m_currentIndex);

    QRect pm_rect;

    if (action->menu() || hasSubMenuPixmap(action)) {

        pm_rect = subMenuPixmapRect(action);

        extendClickableArea(&pm_rect, layoutDirection());

    }

    if (!pm_rect.contains(event->pos()) && m_currentIndex != -1)

        enterEditMode();

    return true;

}

bool QDesignerMenu::handleMousePressEvent(QWidget * /*widget*/, QMouseEvent *event)

{

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

        QWidget *clickedWidget = QApplication::widgetAt(event->globalPos());

        if (QMenuBar *mb = qobject_cast<QMenuBar*>(clickedWidget)) {

            const QPoint pt = mb->mapFromGlobal(event->globalPos());

            if (QAction *action = mb->actionAt(pt)) {

                QMenu * menu = action->menu();

                if (menu == findRootMenu()) {

                    // propagate the mouse press event (but don't close the popup)

                    sendMouseEventTo(mb, pt, event);

                    return true;

                }

            }

        }

        if (QDesignerMenu *m = qobject_cast<QDesignerMenu *>(clickedWidget)) {

            m->hideSubMenu();

            sendMouseEventTo(m, m->mapFromGlobal(event->globalPos()), event);

        } else {

            QDesignerMenu *root = findRootMenu();

            root->hide();

            root->hideSubMenu();

        }

        if (clickedWidget) {

            if (QWidget *focusProxy = clickedWidget->focusProxy())

                clickedWidget = focusProxy;

            if (clickedWidget->focusPolicy() != Qt::NoFocus)

                clickedWidget->setFocus(Qt::OtherFocusReason);

        }

        return true;

    }

    m_showSubMenuTimer->stop();

    m_startPosition = QPoint();

    event->accept();

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

        return true;

    m_startPosition = mapFromGlobal(event->globalPos());

    const int index = findAction(m_startPosition);

    QAction *action = safeActionAt(index);

    QRect pm_rect = subMenuPixmapRect(action);

    extendClickableArea(&pm_rect, layoutDirection());

    const int old_index = m_currentIndex;

    m_currentIndex = index;

    if ((hasSubMenuPixmap(action) || action->menu() != 0)

        && pm_rect.contains(m_startPosition)) {

        if (m_currentIndex == m_lastSubMenuIndex) {

            hideSubMenu();

        } else

            slotShowSubMenuNow();

    } else {

        if (index == old_index) {

            if (m_currentIndex == m_lastSubMenuIndex)

                hideSubMenu();

        } else {

            hideSubMenu();

        }

    }

    update();

    if (index != old_index)

        selectCurrentAction();

    return true;

}

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

{

    event->accept();

    m_startPosition = QPoint();

    return true;

}

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

{

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

        return true;

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

        if (QMenuBar *mb = qobject_cast<QMenuBar*>(QApplication::widgetAt(event->globalPos()))) {

            const QPoint pt = mb->mapFromGlobal(event->globalPos());

            QAction *action = mb->actionAt(pt);

            if (action && action->menu() == findRootMenu()) {

                // propagate the mouse press event (but don't close the popup)

                sendMouseEventTo(mb, pt, event);

                return true;

            }

            // hide the popup Qt will replay the event

            slotDeactivateNow();

        }

        return true;

    }

    if (m_startPosition.isNull())

        return true;

    event->accept();

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

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

        return true;

    startDrag(m_startPosition, event->modifiers());

    m_startPosition = QPoint();

    return true;

}

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

{

    event->accept();

    const int index = findAction(mapFromGlobal(event->globalPos()));

    QAction *action = safeActionAt(index);

    if (qobject_cast<SpecialMenuAction*>(action))

        return true;

    QMenu menu;

    QVariant itemData;

    qVariantSetValue(itemData, action);

    QAction *addSeparatorAction = menu.addAction(tr("Insert separator"));

    addSeparatorAction->setData(itemData);

    QAction *removeAction = 0;

    if (action->isSeparator())

        removeAction = menu.addAction(tr("Remove separator"));

    else

        removeAction = menu.addAction(tr("Remove action '%1'").arg(action->objectName()));

    removeAction->setData(itemData);

    connect(addSeparatorAction, SIGNAL(triggered(bool)), this, SLOT(slotAddSeparator()));

    connect(removeAction, SIGNAL(triggered(bool)), this, SLOT(slotRemoveSelectedAction()));

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

    return true;

}

void QDesignerMenu::slotAddSeparator()

{

    QAction *action = qobject_cast<QAction *>(sender());

    if (!action)

        return;

    QAction *a = qvariant_cast<QAction*>(action->data());

    Q_ASSERT(a != 0);

    const int pos = actions().indexOf(a);

    QAction *action_before = 0;

    if (pos != -1)

        action_before = safeActionAt(pos);

    QDesignerFormWindowInterface *fw = formWindow();

    fw->beginCommand(tr("Add separator"));

    QAction *sep = createAction(QString(), true);

    InsertActionIntoCommand *cmd = new InsertActionIntoCommand(fw);

    cmd->init(this, sep, action_before);

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

    if (parentMenu()) {

        QAction *parent_action = parentMenu()->currentAction();

        if (parent_action->menu() == 0) {

            CreateSubmenuCommand *cmd = new CreateSubmenuCommand(fw);

            cmd->init(parentMenu(), parentMenu()->currentAction());

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

        }

    }