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

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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 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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** $QT_END_LICENSE$

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

#include "layoutinfo_p.h"

#include <QtDesigner/QDesignerFormEditorInterface>

#include <QtDesigner/QDesignerContainerExtension>

#include <QtDesigner/QDesignerMetaDataBaseInterface>

#include <QtDesigner/QExtensionManager>

#include <QtGui/QHBoxLayout>

#include <QtGui/QFormLayout>

#include <QtGui/QSplitter>

#include <QtCore/QDebug>

#include <QtCore/QHash>

#include <QtCore/QRect>

QT_BEGIN_NAMESPACE

namespace qdesigner_internal {

/*!

  \overload

*/

LayoutInfo::Type LayoutInfo::layoutType(const QDesignerFormEditorInterface *core, const QLayout *layout)

{

    Q_UNUSED(core)

    if (!layout)

        return NoLayout;

    else if (qobject_cast<const QHBoxLayout*>(layout))

        return HBox;

    else if (qobject_cast<const QVBoxLayout*>(layout))

        return VBox;

    else if (qobject_cast<const QGridLayout*>(layout))

        return Grid;

    else if (qobject_cast<const QFormLayout*>(layout))

       return Form;

    return UnknownLayout;

}

static const QHash<QString, LayoutInfo::Type> &layoutNameTypeMap()

{

    static QHash<QString, LayoutInfo::Type> nameTypeMap;

    if (nameTypeMap.empty()) {

        nameTypeMap.insert(QLatin1String("QVBoxLayout"), LayoutInfo::VBox);

        nameTypeMap.insert(QLatin1String("QHBoxLayout"), LayoutInfo::HBox);

        nameTypeMap.insert(QLatin1String("QGridLayout"), LayoutInfo::Grid);

        nameTypeMap.insert(QLatin1String("QFormLayout"), LayoutInfo::Form);

    }

    return nameTypeMap;

}

LayoutInfo::Type LayoutInfo::layoutType(const QString &typeName)

{

    return layoutNameTypeMap().value(typeName, NoLayout);

}

QString LayoutInfo::layoutName(Type t)

{

    return layoutNameTypeMap().key(t);

}

/*!

  \overload

*/

LayoutInfo::Type LayoutInfo::layoutType(const QDesignerFormEditorInterface *core, const QWidget *w)

{

    if (const QSplitter *splitter = qobject_cast<const QSplitter *>(w))

        return  splitter->orientation() == Qt::Horizontal ? HSplitter : VSplitter;

    return layoutType(core, w->layout());

}

LayoutInfo::Type LayoutInfo::managedLayoutType(const QDesignerFormEditorInterface *core,

                                               const QWidget *w,

                                               QLayout **ptrToLayout)

{

    if (ptrToLayout)

        *ptrToLayout = 0;

    if (const QSplitter *splitter = qobject_cast<const QSplitter *>(w))

        return  splitter->orientation() == Qt::Horizontal ? HSplitter : VSplitter;

    QLayout *layout = managedLayout(core, w);

    if (!layout)

        return NoLayout;

    if (ptrToLayout)

        *ptrToLayout = layout;

    return layoutType(core, layout);

}

QWidget *LayoutInfo::layoutParent(const QDesignerFormEditorInterface *core, QLayout *layout)

{

    Q_UNUSED(core)

    QObject *o = layout;

    while (o) {

        if (QWidget *widget = qobject_cast<QWidget*>(o))

            return widget;

        o = o->parent();

    }

    return 0;

}

void LayoutInfo::deleteLayout(const QDesignerFormEditorInterface *core, QWidget *widget)

{

    if (QDesignerContainerExtension *container = qt_extension<QDesignerContainerExtension*>(core->extensionManager(), widget))

        widget = container->widget(container->currentIndex());

    Q_ASSERT(widget != 0);

    QLayout *layout = managedLayout(core, widget);

    if (layout == 0 || core->metaDataBase()->item(layout) != 0) {

        delete layout;

        widget->updateGeometry();

        return;

    }

    qDebug() << "trying to delete an unmanaged layout:" << "widget:" << widget << "layout:" << layout;

}

LayoutInfo::Type LayoutInfo::laidoutWidgetType(const QDesignerFormEditorInterface *core,

                                               QWidget *widget,

                                               bool *isManaged,

                                               QLayout **ptrToLayout)

{

    if (isManaged)

        *isManaged = false;

    if (ptrToLayout)

        *ptrToLayout = 0;

    QWidget *parent = widget->parentWidget();

    if (!parent)

        return NoLayout;

    // 1) Splitter

    if (QSplitter *splitter  = qobject_cast<QSplitter*>(parent)) {

        if (isManaged)

            *isManaged = core->metaDataBase()->item(splitter);

        return  splitter->orientation() == Qt::Horizontal ? HSplitter : VSplitter;

    }

    // 2) Layout of parent

    QLayout *parentLayout = parent->layout();

    if (!parentLayout)

        return NoLayout;

    if (parentLayout->indexOf(widget) != -1) {

        if (isManaged)

            *isManaged = core->metaDataBase()->item(parentLayout);

        if (ptrToLayout)

            *ptrToLayout = parentLayout;

        return layoutType(core, parentLayout);

    }

    // 3) Some child layout (see below comment about Q3GroupBox)

    const QList<QLayout*> childLayouts = qFindChildren<QLayout*>(parentLayout);

    if (childLayouts.empty())

        return NoLayout;

    const QList<QLayout*>::const_iterator lcend = childLayouts.constEnd();

    for (QList<QLayout*>::const_iterator it = childLayouts.constBegin(); it != lcend; ++it) {

        QLayout *layout = *it;

        if (layout->indexOf(widget) != -1) {

            if (isManaged)

                *isManaged = core->metaDataBase()->item(layout);

            if (ptrToLayout)

                *ptrToLayout = layout;

            return layoutType(core, layout);

        }

    }

    return NoLayout;

}

QLayout *LayoutInfo::internalLayout(const QWidget *widget)

{

    QLayout *widgetLayout = widget->layout();

    if (widgetLayout && widget->inherits("Q3GroupBox")) {

        if (widgetLayout->count()) {

            widgetLayout = widgetLayout->itemAt(0)->layout();

        } else {

            widgetLayout = 0;

        }

    }

    return widgetLayout;

}

QLayout *LayoutInfo::managedLayout(const QDesignerFormEditorInterface *core, const QWidget *widget)

{

    if (widget == 0)

        return 0;

    QLayout *layout = widget->layout();

    if (!layout)

        return 0;

    return managedLayout(core, layout);

}

QLayout *LayoutInfo::managedLayout(const QDesignerFormEditorInterface *core, QLayout *layout)

{

    QDesignerMetaDataBaseInterface *metaDataBase = core->metaDataBase();

    if (!metaDataBase)

        return layout;

    /* This code exists mainly for the Q3GroupBox class, for which

     * widget->layout() returns an internal VBoxLayout. */

    const QDesignerMetaDataBaseItemInterface *item = metaDataBase->item(layout);

    if (item == 0) {

        layout = qFindChild<QLayout*>(layout);

        item = metaDataBase->item(layout);

    }

    if (!item)

        return 0;

    return layout;

}

// Is it a a dummy grid placeholder created by Designer?

bool LayoutInfo::isEmptyItem(QLayoutItem *item)

{

    if (item == 0) {

        qDebug() << "** WARNING Zero-item passed on to isEmptyItem(). This indicates a layout inconsistency.";

        return true;

    }

    return item->spacerItem() != 0;

}

QDESIGNER_SHARED_EXPORT void getFormLayoutItemPosition(const QFormLayout *formLayout, int index, int *rowPtr, int *columnPtr, int *rowspanPtr, int *colspanPtr)

{

    int row;

    QFormLayout::ItemRole role;

    formLayout->getItemPosition(index, &row, &role);

    const int columnspan = role == QFormLayout::SpanningRole ? 2 : 1;

    const int column = (columnspan > 1 || role == QFormLayout::LabelRole) ? 0 : 1;

    if (rowPtr)

        *rowPtr = row;

    if (columnPtr)

        *columnPtr = column;

    if (rowspanPtr)

        *rowspanPtr = 1;

    if (colspanPtr)

        *colspanPtr = columnspan;

}

static inline QFormLayout::ItemRole formLayoutRole(int column, int colspan)

{

    if (colspan > 1)

        return QFormLayout::SpanningRole;

    return column == 0 ? QFormLayout::LabelRole : QFormLayout::FieldRole;

}

QDESIGNER_SHARED_EXPORT void formLayoutAddWidget(QFormLayout *formLayout, QWidget *w, const QRect &r, bool insert)

{

    // Consistent API galore...

    if (insert) {

        const bool spanning = r.width() > 1;

        if (spanning) {

            formLayout->insertRow(r.y(), w);

        } else {

            QWidget *label = 0, *field = 0;

            if (r.x() == 0) {

                label = w;

            } else {

                field = w;

            }

            formLayout->insertRow(r.y(), label, field);

        }

    } else {

        formLayout->setWidget(r.y(), formLayoutRole(r.x(), r.width()), w);

    }

}

} // namespace qdesigner_internal

QT_END_NAMESPACE