/* This file is part of the KDE project
   Copyright (C) 2006-2007 Jaroslaw Staniek <js@iidea.pl>

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This program 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this program; see the file COPYING.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
*/

#ifndef KexiDBComboBox_H
#define KexiDBComboBox_H

#include "kexidbutils.h"
#include "kexidbautofield.h"
#include <widget/tableview/kexicomboboxbase.h>

//! @short Combo box widget for Kexi forms
/*! This widget is implemented on top of KexiDBAutoField, 
 so as it uses KexiDBAutoField's ability of embedding subwidgets,
 it can display not only a line edit but also text edit or image box
 (more can be added in the future). 
 A drop-down button is added to mimic native combo box widget's functionality.
*/
class KEXIFORMUTILS_EXPORT KexiDBComboBox : 
	public KexiDBAutoField, public KexiComboBoxBase
{
	Q_OBJECT
	Q_PROPERTY( bool editable READ isEditable WRITE setEditable )
	//properties from KexiDBAutoField that should not be visible:
	Q_OVERRIDE(QColor paletteBackgroundColor READ paletteBackgroundColor WRITE setPaletteBackgroundColor DESIGNABLE true RESET unsetPalette)
	Q_OVERRIDE(QColor foregroundLabelColor DESIGNABLE false)
	Q_OVERRIDE(QColor backgroundLabelColor DESIGNABLE false)
	Q_OVERRIDE(bool autoCaption DESIGNABLE false)

	public:
		KexiDBComboBox(QWidget *parent, const char *name=0, bool designMode = true);
		virtual ~KexiDBComboBox();

		//! Implemented for KexiComboBoxBase: form has no 'related data' model (only the full database model)
		virtual KexiTableViewColumn *column() const { return 0; }

		//! Implemented for KexiComboBoxBase
		virtual KexiDB::Field *field() const { return KexiDBAutoField::field(); }

		//! Implemented for KexiComboBoxBase
		virtual QVariant origValue() const { return m_origValue; }

		void setEditable(bool set);
		bool isEditable() const;

		virtual void setLabelPosition(LabelPosition position);

		virtual QVariant value() { return KexiComboBoxBase::value(); }

		virtual QVariant visibleValue();

		//! Reimpemented because to avoid taking value from the internal editor (index is taken from the popup instead)
		virtual bool valueChanged();

		virtual QSize sizeHint() const;

		//! Reimplemented after KexiDBAutoField: jsut sets \a cinfo without initializing a subwidget.
		//! Initialization is performed by \ref setVisibleColumnInfo().
		virtual void setColumnInfo(KexiDB::QueryColumnInfo* cinfo);

		/*! Used internally to set visible database column information.
		 Reimplemented: performs initialization of the subwidget. */
		virtual void setVisibleColumnInfo(KexiDB::QueryColumnInfo* cinfo);

		/*! \return visible database column information for this item.
		 Reimplemented. */
		virtual KexiDB::QueryColumnInfo* visibleColumnInfo() const;

		const QColor & paletteBackgroundColor() const { return KexiDBAutoField::paletteBackgroundColor(); }

		//! Reimplemented to also set 'this' widget's background color, not only subwidget's.
		virtual void setPaletteBackgroundColor( const QColor & color );

		/*! Undoes changes made to this item - just resets the widget to original value. 
		 Reimplemented after KexiFormDataItemInterface to also revert the visible value 
		 (i.e. text) to the original state. */
		virtual void undoChanges();

	public slots:
		void slotRowAccepted(KexiTableItem *item, int row);
		void slotItemSelected(KexiTableItem* item) { KexiComboBoxBase::slotItemSelected(item); }

	protected slots:
		void slotInternalEditorValueChanged(const QVariant& v)
			{ KexiComboBoxBase::slotInternalEditorValueChanged(v); }

	protected:
		QRect buttonGeometry() const;

		virtual void paintEvent( QPaintEvent * );

		virtual void mousePressEvent( QMouseEvent *e );

		void mouseDoubleClickEvent( QMouseEvent *e );

		virtual bool eventFilter( QObject *o, QEvent *e );

		//! \return internal editor's geometry
		QRect editorGeometry() const;

		//! Creates editor. Reimplemented, because if the combo box is not editable, 
		//! editor should not be created.
		virtual void createEditor();

		/*! Reimplemented */
		virtual void styleChange( QStyle& oldStyle );

		/*! Reimplemented */
		virtual void fontChange( const QFont & oldFont );

		virtual bool subwidgetStretchRequired(KexiDBAutoField* autoField) const;

		//! Implemented for KexiComboBoxBase
		virtual QWidget *internalEditor() const { return /*WidgetWithSubpropertiesInterface*/m_subwidget; }

		//! Implemented for KexiComboBoxBase. Does nothing if the widget is not editable.
		virtual void moveCursorToEndInInternalEditor();

		//! Implemented for KexiComboBoxBase. Does nothing if the widget is not editable.
		virtual void selectAllInInternalEditor();

		//! Implemented for KexiComboBoxBase
		virtual void setValueInInternalEditor(const QVariant& value);

		//! Implemented for KexiComboBoxBase
		virtual QVariant valueFromInternalEditor();

		//! Implemented for KexiComboBoxBase
		virtual void editRequested();

		//! Implemented for KexiComboBoxBase
		virtual void acceptRequested();

		//! Implement this to return a position \a pos mapped from parent (e.g. viewport) 
		//! to global coordinates. QPoint(-1, -1) should be returned if this cannot be computed.
		virtual QPoint mapFromParentToGlobal(const QPoint& pos) const;

		//! Implement this to return a hint for popup width.
		virtual int popupWidthHint() const;

		virtual void setValueInternal(const QVariant& add, bool removeOld);

		//! Implemented to handle visible value instead of index
		virtual void setVisibleValueInternal(const QVariant& value);

		bool handleMousePressEvent(QMouseEvent *e);

		bool handleKeyPressEvent(QKeyEvent *ke);

		//! Implemented for KexiDataItemInterface
		virtual void beforeSignalValueChanged();

		virtual KexiComboBoxPopup *popup() const;
		virtual void setPopup(KexiComboBoxPopup *popup);

		/*! Called by top-level form on key press event.
		 Used for Key_Escape to if the popup is visible,
		 so the key press won't be consumed to perform "cancel editing". 
		 Also used for grabbing page down/up keys. */
		virtual bool keyPressed(QKeyEvent *ke);

		class Private;
		Private * const d;
};

#endif