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

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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 QtGui module of the Qt Toolkit.

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

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** contained in the Technology Preview License Agreement accompanying

** this package.

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

#include <qaction.h>

#include <qwidgetaction.h>

#include <qtoolbar.h>

#include <qstyleoption.h>

#include <qtoolbutton.h>

#include <qmenu.h>

#include <qdebug.h>

#include <qmath.h>

#include "qmainwindowlayout_p.h"

#include "qtoolbarextension_p.h"

#include "qtoolbarlayout_p.h"

#include "qtoolbarseparator_p.h"

#ifndef QT_NO_TOOLBAR

QT_BEGIN_NAMESPACE

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

** QToolBarItem

*/

QToolBarItem::QToolBarItem(QWidget *widget)

    : QWidgetItem(widget), action(0), customWidget(false)

{

}

bool QToolBarItem::isEmpty() const

{

    return action == 0 || !action->isVisible();

}

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

** QToolBarLayout

*/

QToolBarLayout::QToolBarLayout(QWidget *parent)

    : QLayout(parent), expanded(false), animating(false), dirty(true),

        expanding(false), empty(true), expandFlag(false), popupMenu(0)

{

    QToolBar *tb = qobject_cast<QToolBar*>(parent);

    if (!tb)

        return;

    extension = new QToolBarExtension(tb);

    extension->setFocusPolicy(Qt::NoFocus);

    extension->hide();

    QObject::connect(tb, SIGNAL(orientationChanged(Qt::Orientation)),

                     extension, SLOT(setOrientation(Qt::Orientation)));

    setUsePopupMenu(qobject_cast<QMainWindow*>(tb->parentWidget()) == 0);

}

QToolBarLayout::~QToolBarLayout()

{

    while (!items.isEmpty()) {

        QToolBarItem *item = items.takeFirst();

        if (QWidgetAction *widgetAction = qobject_cast<QWidgetAction*>(item->action)) {

            if (item->customWidget)

                widgetAction->releaseWidget(item->widget());

        }

        delete item;

    }

}

void QToolBarLayout::updateMarginAndSpacing()

{

    QToolBar *tb = qobject_cast<QToolBar*>(parentWidget());

    if (!tb)

        return;

    QStyle *style = tb->style();

    QStyleOptionToolBar opt;

    tb->initStyleOption(&opt);

    setMargin(style->pixelMetric(QStyle::PM_ToolBarItemMargin, &opt, tb)

                + style->pixelMetric(QStyle::PM_ToolBarFrameWidth, &opt, tb));

    setSpacing(style->pixelMetric(QStyle::PM_ToolBarItemSpacing, &opt, tb));

}

bool QToolBarLayout::hasExpandFlag() const

{

    return expandFlag;

}

void QToolBarLayout::setUsePopupMenu(bool set)

{

    if (!dirty && ((popupMenu == 0) == set))

        invalidate();

    if (!set) {

        QObject::connect(extension, SIGNAL(clicked(bool)),

                        this, SLOT(setExpanded(bool)), Qt::UniqueConnection);

        extension->setPopupMode(QToolButton::DelayedPopup);

        extension->setMenu(0);

        delete popupMenu;

        popupMenu = 0;

    } else {

        QObject::disconnect(extension, SIGNAL(clicked(bool)),

                            this, SLOT(setExpanded(bool)));

        extension->setPopupMode(QToolButton::InstantPopup);

        if (!popupMenu) {

            popupMenu = new QMenu(extension);

        }

        extension->setMenu(popupMenu);

    }

}

void QToolBarLayout::checkUsePopupMenu()

{

    QToolBar *tb = static_cast<QToolBar *>(parent());

    QMainWindow *mw = qobject_cast<QMainWindow *>(tb->parent());

    Qt::Orientation o = tb->orientation();

    setUsePopupMenu(!mw || tb->isFloating() || perp(o, expandedSize(mw->size())) >= perp(o, mw->size()));

}

void QToolBarLayout::addItem(QLayoutItem*)

{

    qWarning() << "QToolBarLayout::addItem(): please use addAction() instead";

    return;

}

QLayoutItem *QToolBarLayout::itemAt(int index) const

{

    if (index < 0 || index >= items.count())

        return 0;

    return items.at(index);

}

QLayoutItem *QToolBarLayout::takeAt(int index)

{

    if (index < 0 || index >= items.count())

        return 0;

    QToolBarItem *item = items.takeAt(index);

    if (popupMenu)

        popupMenu->removeAction(item->action);

    QWidgetAction *widgetAction = qobject_cast<QWidgetAction*>(item->action);

    if (widgetAction != 0 && item->customWidget) {

        widgetAction->releaseWidget(item->widget());

    } else {

        // destroy the QToolButton/QToolBarSeparator

        item->widget()->hide();

        item->widget()->deleteLater();

    }

    invalidate();

    return item;

}

void QToolBarLayout::insertAction(int index, QAction *action)

{

    index = qMax(0, index);

    index = qMin(items.count(), index);

    QToolBarItem *item = createItem(action);

    if (item) {

        items.insert(index, item);

        invalidate();

    }

}

int QToolBarLayout::indexOf(QAction *action) const

{

    for (int i = 0; i < items.count(); ++i) {

        if (items.at(i)->action == action)

            return i;

    }

    return -1;

}

int QToolBarLayout::count() const

{

    return items.count();

}

bool QToolBarLayout::isEmpty() const

{

    if (dirty)

        updateGeomArray();

    return empty;

}

void QToolBarLayout::invalidate()

{

    dirty = true;

    QLayout::invalidate();

}

Qt::Orientations QToolBarLayout::expandingDirections() const

{

    if (dirty)

        updateGeomArray();

    QToolBar *tb = qobject_cast<QToolBar*>(parentWidget());

    if (!tb)

        return Qt::Orientations(0);

    Qt::Orientation o = tb->orientation();

    return expanding ? Qt::Orientations(o) : Qt::Orientations(0);

}

bool QToolBarLayout::movable() const

{

    QToolBar *tb = qobject_cast<QToolBar*>(parentWidget());

    if (!tb)

        return false;

    QMainWindow *win = qobject_cast<QMainWindow*>(tb->parentWidget());

    return tb->isMovable() && win != 0;

}

void QToolBarLayout::updateGeomArray() const

{

    if (!dirty)

        return;

    QToolBarLayout *that = const_cast<QToolBarLayout*>(this);

    QToolBar *tb = qobject_cast<QToolBar*>(parentWidget());

    if (!tb)

        return;

    QStyle *style = tb->style();

    QStyleOptionToolBar opt;

    tb->initStyleOption(&opt);

    const int handleExtent = movable()

            ? style->pixelMetric(QStyle::PM_ToolBarHandleExtent, &opt, tb) : 0;

    const int margin = this->margin();

    const int spacing = this->spacing();

    const int extensionExtent = style->pixelMetric(QStyle::PM_ToolBarExtensionExtent, &opt, tb);

    Qt::Orientation o = tb->orientation();

    that->minSize = QSize(0, 0);

    that->hint = QSize(0, 0);

    rperp(o, that->minSize) = style->pixelMetric(QStyle::PM_ToolBarHandleExtent, &opt, tb);

    rperp(o, that->hint) = style->pixelMetric(QStyle::PM_ToolBarHandleExtent, &opt, tb);

    that->expanding = false;

    that->empty = false;

    QVector<QLayoutStruct> a(items.count() + 1); // + 1 for the stretch

    int count = 0;

    for (int i = 0; i < items.count(); ++i) {

        QToolBarItem *item = items.at(i);

        QSize max = item->maximumSize();

        QSize min = item->minimumSize();

        QSize hint = item->sizeHint();

        Qt::Orientations exp = item->expandingDirections();

        bool empty = item->isEmpty();

        that->expanding = expanding || exp & o;

        if (item->widget()) {

            if ((item->widget()->sizePolicy().horizontalPolicy() & QSizePolicy::ExpandFlag)) {

                that->expandFlag = true;

            }

        }

        if (!empty) {

            if (count == 0) // the minimum size only displays one widget

                rpick(o, that->minSize) += pick(o, min);

            int s = perp(o, minSize);

            rperp(o, that->minSize) = qMax(s, perp(o, min));

            //we only add spacing before item (ie never before the first one)

            rpick(o, that->hint) += (count == 0 ? 0 : spacing) + pick(o, hint);

            s = perp(o, that->hint);

            rperp(o, that->hint) = qMax(s, perp(o, hint));

            ++count;

        }

        a[i].sizeHint = pick(o, hint);

        a[i].maximumSize = pick(o, max);

        a[i].minimumSize = pick(o, min);

        a[i].expansive = exp & o;

        if (o == Qt::Horizontal)

            a[i].stretch = item->widget()->sizePolicy().horizontalStretch();

        else

            a[i].stretch = item->widget()->sizePolicy().verticalStretch();

        a[i].empty = empty;

    }

    that->geomArray = a;

    that->empty = count == 0;

    rpick(o, that->minSize) += handleExtent;

    that->minSize += QSize(2*margin, 2*margin);

    if (items.count() > 1)

        rpick(o, that->minSize) += spacing + extensionExtent;

    rpick(o, that->hint) += handleExtent;

    that->hint += QSize(2*margin, 2*margin);

    that->dirty = false;

#ifdef Q_WS_MAC

    if (QMainWindow *mw = qobject_cast<QMainWindow *>(parentWidget()->parentWidget())) {

        if (mw->unifiedTitleAndToolBarOnMac()

                && mw->toolBarArea(static_cast<QToolBar *>(parentWidget())) == Qt::TopToolBarArea) {

            if (expandFlag) {

                tb->setMaximumSize(0xFFFFFF, 0xFFFFFF);

            } else {

               tb->setMaximumSize(hint);

            }

        }

    }

#endif

    that->dirty = false;

}

static bool defaultWidgetAction(QToolBarItem *item)

{

    QWidgetAction *a = qobject_cast<QWidgetAction*>(item->action);

    return a != 0 && a->defaultWidget() == item->widget();

}

void QToolBarLayout::setGeometry(const QRect &rect)

{

    QToolBar *tb = qobject_cast<QToolBar*>(parentWidget());

    if (!tb)

        return;

    QStyle *style = tb->style();

    QStyleOptionToolBar opt;

    tb->initStyleOption(&opt);

    const int margin = this->margin();

    const int extensionExtent = style->pixelMetric(QStyle::PM_ToolBarExtensionExtent, &opt, tb);

    Qt::Orientation o = tb->orientation();

    QLayout::setGeometry(rect);

    bool ranOutOfSpace = false;

    if (!animating)

        ranOutOfSpace = layoutActions(rect.size());

    if (expanded || animating || ranOutOfSpace) {

        Qt::ToolBarArea area = Qt::TopToolBarArea;

        if (QMainWindow *win = qobject_cast<QMainWindow*>(tb->parentWidget()))

            area = win->toolBarArea(tb);

        QSize hint = sizeHint();

        QPoint pos;

        rpick(o, pos) = pick(o, rect.bottomRight()) - margin - extensionExtent + 2;

        if (area == Qt::LeftToolBarArea || area == Qt::TopToolBarArea)

            rperp(o, pos) = perp(o, rect.topLeft()) + margin;

        else

            rperp(o, pos) = perp(o, rect.bottomRight()) - margin - (perp(o, hint) - 2*margin) + 1;

        QSize size;

        rpick(o, size) = extensionExtent;

        rperp(o, size) = perp(o, hint) - 2*margin;

        QRect r(pos, size);

        if (o == Qt::Horizontal)

            r = QStyle::visualRect(parentWidget()->layoutDirection(), rect, r);

        extension->setGeometry(r);

        if (extension->isHidden())

            extension->show();

    } else {

        if (!extension->isHidden())

            extension->hide();

    }

#ifdef Q_WS_MAC

    // Nothing to do for Carbon... probably   

#  ifdef QT_MAC_USE_COCOA

    if (QMainWindow *win = qobject_cast<QMainWindow*>(tb->parentWidget())) {

        Qt::ToolBarArea area = win->toolBarArea(tb);

        if (win->unifiedTitleAndToolBarOnMac() && area == Qt::TopToolBarArea) {

            static_cast<QMainWindowLayout *>(win->layout())->fixSizeInUnifiedToolbar(tb);

        }

    }

#  endif

#endif

}

bool QToolBarLayout::layoutActions(const QSize &size)

{

    if (dirty)

        updateGeomArray();

    QRect rect(0, 0, size.width(), size.height());

    QList<QWidget*> showWidgets, hideWidgets;

    QToolBar *tb = qobject_cast<QToolBar*>(parentWidget());

    if (!tb)

        return false;

    QStyle *style = tb->style();

    QStyleOptionToolBar opt;

    tb->initStyleOption(&opt);

    const int handleExtent = movable()

            ? style->pixelMetric(QStyle::PM_ToolBarHandleExtent, &opt, tb) : 0;

    const int margin = this->margin();

    const int spacing = this->spacing();

    const int extensionExtent = style->pixelMetric(QStyle::PM_ToolBarExtensionExtent, &opt, tb);

    Qt::Orientation o = tb->orientation();

    bool extensionMenuContainsOnlyWidgetActions = true;

    int space = pick(o, rect.size()) - 2*margin - handleExtent;

    if (space <= 0)

        return false;  // nothing to do.

    if(popupMenu)

        popupMenu->clear();

    bool ranOutOfSpace = false;

    int rows = 0;

    int rowPos = perp(o, rect.topLeft()) + margin;

    int i = 0;

    while (i < items.count()) {

        QVector<QLayoutStruct> a = geomArray;

        int start = i;

        int size = 0;

        int prev = -1;

        int rowHeight = 0;

        int count = 0;

        int maximumSize = 0;

        bool expansiveRow = false;

        for (; i < items.count(); ++i) {

            if (a[i].empty)

                continue;

            int newSize = size + (count == 0 ? 0 : spacing) + a[i].minimumSize;

            if (prev != -1 && newSize > space) {

                if (rows == 0)

                    ranOutOfSpace = true;

                // do we have to move the previous item to the next line to make space for

                // the extension button?

                if (count > 1 && size + spacing + extensionExtent > space)

                    i = prev;

                break;

            }

            if (expanded)

                rowHeight = qMax(rowHeight, perp(o, items.at(i)->sizeHint()));

            expansiveRow = expansiveRow || a[i].expansive;

            size = newSize;

            maximumSize += spacing + (a[i].expansive ? a[i].maximumSize : a[i].smartSizeHint());

            prev = i;

            ++count;

        }

        // stretch at the end

        a[i].sizeHint = 0;

        a[i].maximumSize = QWIDGETSIZE_MAX;

        a[i].minimumSize = 0;

        a[i].expansive = true;

        a[i].stretch = 0;

        a[i].empty = true;

        if (expansiveRow && maximumSize < space) {

            expansiveRow = false;

            a[i].maximumSize = space - maximumSize;

        }

        qGeomCalc(a, start, i - start + (expansiveRow ? 0 : 1), 0,

                    space - (ranOutOfSpace ? (extensionExtent + spacing) : 0),

                    spacing);

        for (int j = start; j < i; ++j) {

            QToolBarItem *item = items.at(j);

            if (a[j].empty) {

                if (!item->widget()->isHidden())

                    hideWidgets << item->widget();

                continue;

            }

            QPoint pos;

            rpick(o, pos) = margin + handleExtent + a[j].pos;

            rperp(o, pos) = rowPos;

            QSize size;

            rpick(o, size) = a[j].size;

            if (expanded)

                rperp(o, size) = rowHeight;

            else

                rperp(o, size) = perp(o, rect.size()) - 2*margin;

            QRect r(pos, size);

            if (o == Qt::Horizontal)

                r = QStyle::visualRect(parentWidget()->layoutDirection(), rect, r);

            item->setGeometry(r);

            if (item->widget()->isHidden())

                showWidgets << item->widget();

        }