/* Qlom is copyright Openismus GmbH, 2009

 *

 * This file is part of Qlom

 *

 * Qlom is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * Qlom is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with Qlom. If not, see <http://www.gnu.org/licenses/>.

 */

#ifndef QLOM_LAYOUT_DELEGATE_H_

#define QLOM_LAYOUT_DELEGATE_H_

#include <QStyledItemDelegate>

#include <QPainter>

#include <QStyleOptionViewItem>

#include <QModelIndex>

#include <QSize>

#include <libglom/data_structure/layout/fieldformatting.h>

#include <libglom/data_structure/field.h>

/** This is the base class for Glom::FieldFormatting-specific delegates used to

  * format the style of Glom::LayoutItems in the view. In principle, each

  * Glom::LayoutItem implementing get_formatting_used() (which is not part of

  * the interface, though) gets its own delegate class derived from

  * GlomFieldFormattingDelegate.

  */

class QlomFieldFormattingDelegate : public QStyledItemDelegate

{

    Q_OBJECT

public:

    typedef Glom::sharedptr<const Glom::Field> GlomSharedField;

    /* Explicit ctor, although it might have been useful for implicit type

       conversions. */

    explicit QlomFieldFormattingDelegate(

        const Glom::FieldFormatting &formatting, const GlomSharedField details,

        QObject *parent = 0);

    virtual ~QlomFieldFormattingDelegate();

    virtual void paint(QPainter *painter, const QStyleOptionViewItem &option,

        const QModelIndex &index) const;

    virtual QSize sizeHint(const QStyleOptionViewItem &option,

        const QModelIndex &index) const;

protected:

    const Glom::FieldFormatting theFormattingUsed;

    const GlomSharedField theFieldDetails;

};

class QlomLayoutItemFieldDelegate : public QlomFieldFormattingDelegate

{

    Q_OBJECT

public:

    explicit QlomLayoutItemFieldDelegate(

        const Glom::FieldFormatting &formatting, const GlomSharedField details,

        QObject *parent = 0);

    virtual ~QlomLayoutItemFieldDelegate();

    virtual QString displayText(const QVariant &value, const QLocale &locale)

        const;

private:

    QString applyNumericFormatting(double numeric, const QLocale &locale) const;

};

class QlomLayoutItemTextDelegate : public QlomFieldFormattingDelegate

{

    Q_OBJECT

public:

    QlomLayoutItemTextDelegate(const Glom::FieldFormatting &formatting,

        const GlomSharedField details, const QString &displayText, QObject *parent = 0);

    virtual ~QlomLayoutItemTextDelegate();

    /** Ignore the value from the model for static text item and return the

     * stored value - theDisplayText - instead.

     *  @param[in] unused

     *  @param[in] unused

     */

    virtual QString displayText(const QVariant &, const QLocale &) const;

private:

    QString theDisplayText;

};

/** QSignalMappers only accept a limited subset of types for their bindins, one

 *  of them being QObjects. This class acts as a closure for QModelIndices */

class QlomModelIndexObject : public QObject

{

   Q_OBJECT

public:

    explicit QlomModelIndexObject(const QModelIndex &index, QObject *parent = 0);

    virtual ~QlomModelIndexObject();

    QModelIndex index() const;

private:

    QModelIndex theIndex;

};

/** This class inserts a button into the view (at the queried model index)

  * when it is *first* asked to paint itself. */

class QlomButtonDelegate : public QStyledItemDelegate

{

    Q_OBJECT

public:

    explicit QlomButtonDelegate(const QString &label, QObject *parent = 0);

    virtual ~QlomButtonDelegate();

    /** This method assumes:

      * 1) parent() returns a valid QAbstractItemView,

      * 2) There is no QWidget at index yet,

      * 3) The widget at index does not get replaced (this is a soft

      *    assumption, paint(.) would simply not recreate the button widget in

      *    that case). */

    virtual void paint(QPainter *painter, const QStyleOptionViewItem &option,

        const QModelIndex &index) const;

Q_SIGNALS:

    void buttonPressed(QObject *obj);

private:

    QString theLabel;

};

#endif // QLOM_LAYOUT_DELEGATE_H_