// -*- C++ -*-

/*
 * GChemPaint library
 * view.h
 *
 * Copyright (C) 2001-2011 Jean Bréfort <jean.brefort@normalesup.org>
 *
 * This program 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.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
 * USA
 */

#ifndef GCHEMPAINT_VIEW_H
#define GCHEMPAINT_VIEW_H

/*!\file*/

#include <gcu/macros.h>
#include <gccv/client.h>
#include <list>
#include <map>

namespace gccv {
	class Canvas;
	class Text;
}

namespace gcu {
	class Object;
};

namespace gcugtk {
	class UIManager;
}

namespace gcp {

class Atom;
class Bond;
class Document;
class WidgetData;

#define GCHEMPAINT_ATOM_NAME "application/x-gchempaint"
extern GtkTargetEntry const targets[];

/*!\class View gcp/view.h
The GChempaint document view.
*/
class View: public gccv::Client
{
public:
	//Constructor and destructor
/*!
@param pDoc the GchemPaint document for the new view.
@param Embedded whether the document is embedded in another application
or is standalone.

Constructs the document view.
*/
	View (Document *pDoc, bool Embedded);
/*!
The destructor.
*/
	virtual ~View ();

	//Interface
public:
/*!
@return the canvas widget used for the view.
*/
	GtkWidget* GetWidget () {return m_pWidget;}
/*!
@return the document associated with the view.
*/
	Document* GetDoc () {return m_pDoc;}
/*!
@param pObject the object to add.

Adds the object to the canvas.
*/
	void AddObject (gcu::Object *pObject);
/*!
@param pObject the object to update.

Updates the object in the canvas.
*/
	void Update (gcu::Object *pObject);
/*!
Creates a new canvas widget for the view.

@return the new widget.
*/
	GtkWidget* CreateNewWidget ();
/*!
@param widget the destroyed widget.

Called by the framework when a widget is destroyed.
*/
	void OnDestroy (GtkWidget* widget);
/*!
@return the current zoom factor.
*/
	double GetZoomFactor ();
/*!
Updates fonts descriptions after a theme change.
*/
	void UpdateFont ();
/*!
@param pObject the object to remove.

Removes the object from the view and destroys the items representing it.
*/
	void Remove (gcu::Object* pObject);
/*!
@return the height of the font used to display atomic symbols.
*/
	double GetFontHeight () {return m_dFontHeight;}
/*!
@return the name of the font used to display atomic symbols.
*/
	gchar* GetFontName () {return m_sFontName;}
/*!
@return the name of the font used to display stoichiometry indices and charges.
*/
	gchar* GetSmallFontName () {return m_sSmallFontName;}
/*!
@return the description of the font used to display atomic symbols.
*/
	PangoFontDescription* GetPangoFontDesc () {return m_PangoFontDesc;}
/*!
@return the description of the default font used to display text.
*/
	PangoFontDescription* GetPangoTextFontDesc () {return m_PangoTextFontDesc;}
/*!
@return the description of the font used to display stoichiometry indices and charges.
*/
	PangoFontDescription* GetPangoSmallFontDesc () {return m_PangoSmallFontDesc;}
/*!
@param w the active document widget.

Removes all objects in the widget.
*/
	void OnDeleteSelection (GtkWidget* w);
/*!
@param w the active document widget.
@param clipboard a GtkClipboard.

Called by the framework to copy the selection.
*/
	void OnCopySelection (GtkWidget* w, GtkClipboard* clipboard);
/*!
@param w the active document widget.
@param clipboard a GtkClipboard.

Called by the framework to paste clipboard contents.
*/
	void OnPasteSelection (GtkWidget* w, GtkClipboard* clipboard);
/*!
@param w the active document widget.
@param clipboard a GtkClipboard.

Called by the framework to copy and delete the selection.
*/
	void OnCutSelection (GtkWidget* w, GtkClipboard* clipboard);
/*!
@param w the widget which received the event.
@param event the current event.

Called by the framework when a key has been pressed on the keyboard.
@return true if the key was significant, false otherwise.
*/
	bool OnKeyPress (GtkWidget* w, GdkEventKey* event);
/*!
@param w the widget which received the event.
@param event the current event.

Called by the framework when a key has been released on the keyboard.
@return true if the key was significant, false otherwise.
*/
	bool OnKeyRelease (GtkWidget* w, GdkEventKey* event);
/*!
@param item a text item or NULL.

Sets the currently edited text item. \a item should be NULL to tell the view
that no text edition is currently taking place.
*/
	void SetTextActive (gccv::Text* item);
/*!
Called by the framework when the active window changes to stop current edition
and inhibit timer events.

@return true if the change is possible, false to abort it.
*/
	bool PrepareUnselect ();
/*!
@param clipboard the clipboard used.
@param selection_data the data to paste.

Called by the framework to effectively paste data in the document.
*/
	void OnReceive (GtkClipboard* clipboard, GtkSelectionData* selection_data);
/*!
Called by the framework to select everything in the document.
*/
	void OnSelectAll ();
/*!
@return true if the view is embedded in another document view.
*/
	bool IsEmbedded () {return m_bEmbedded;}
/*!
@return the number of existing canvases for this view.
*/
	int GetNbWidgets () {return m_Widgets.size ();}
/*!
@param filename the file name to use for the export.
@param type a string representing the image type as used by the GdkPixbuf
library. Other types supported are "svg", "ps", "pdf", and "eps".
@param resolution the image resolution to use for bitmaps.

Exports the current document to an image. The \a resolution parameter is
significative only for bitmap images; if it is not given, of if negative, 1
will be used which will result as a one to one pixel export.
*/
	void ExportImage (std::string const &filename, const char* type, int resolution = -1);
/*!
@return the svg output as a newly allocated string. Call g_free when done with it.
*/
	char *BuildSVG ();
/*!
@return the eps output as a newly allocated string. Call g_free when done with it.
*/
	char *BuildEPS ();
/*!
@param resolution the resolution for the new image.
@param transparent whether the pixbuf should have a transparent background.

Builds a new image with the given resolution in ppi. The size is evaluated
using the guessed screen resolution.
@return the new pixbuf.
*/
	GdkPixbuf *BuildPixbuf (int resolution, bool transparent = true);
/*!
Called by the framework to ensure that the view size is enough large to
contain all objects.
*/
	void EnsureSize ();
/*!
@param zoom the new zoom level.

Sets the zoom level.
*/
	void Zoom (double zoom);
/*!
@param show whether to show the cursor or not.

Shows or hides the cursor in the currently edited text item if any.
*/
	void ShowCursor (bool show);
/*!
Called by the framework to update the default font size after a theme change.
*/
	void UpdateTheme ();
/*!
@param cr the cairo_t to which render.

Renders the document using cairo.
*/
	void Render (cairo_t *cr);
/*!
@param object the object which seection state should be changed.
@param state the new selection state.

Changes the selection state of \a object if it owns an item and of all its descendents.
*/
	void SetSelectionState (gcu::Object *object, int state);
	// Signals
	// there is no needd to document these since the documentation in gccv/client.h is appropriate.
	bool OnButtonPressed (gccv::ItemClient *client, unsigned button, double x, double y, unsigned state);
	bool OnButtonReleased (gccv::ItemClient *client, unsigned button, double x, double y, unsigned state);
	bool OnDrag (gccv::ItemClient *client, double x, double y, unsigned state);
	bool OnMotion (gccv::ItemClient *client, double x, double y, unsigned state);
	bool OnLeaveNotify (unsigned state);

/*!
@return the WidgetData associated with the View widget.
*/
	WidgetData *GetData () {return m_pData;}

/*!
@param x0 where to store the left horizontal coordinate of the visible area.
@param y0 where to store the top vertical coordinate of the visible area.
@param x1 where to store the right horizontal coordinate of the visible area.
@param y1 where to store the bottom vertical coordinate of the visible area.

Gets the visible area for the view.
*/
	void GetVisibleArea (double &x0, double &y0, double &x1, double &y1);

	//Implementation
private:
	WidgetData* m_pData;
	Document* m_pDoc;
	GtkWidget* m_pWidget;
	std::list<GtkWidget*> m_Widgets;
	PangoFontDescription* m_PangoFontDesc, *m_PangoSmallFontDesc, *m_PangoTextFontDesc;
	double m_dFontHeight;
	gchar* m_sFontName, *m_sSmallFontName;
	int m_width, m_height;
	double m_lastx, m_lasty;
	bool m_bEmbedded;
	gcugtk::UIManager *m_UIManager;
	bool m_Dragging;
	gcu::Object *m_CurObject;
	Atom *m_CurAtom;


/*!\fn GetBaseLineOffset()
@return the vertical offset for algnment of an atomic symbol. This value is half the height of the "C" character.
*/
GCU_RO_PROP (double, BaseLineOffset)
/*!\fn GetActiveRichText()
@return the currently edited text item if any, or NULL.
*/
GCU_RO_PROP (gccv::Text *, ActiveRichText)
/*!\fn GetCHeight()
@return the half height of a carbon atom symbol in the current theme.
*/
GCU_RO_PROP (double, CHeight)
/*!\fn GetHWidth()
@return the half width of a hydrogen atom symbol in the current theme.
*/
GCU_RO_PROP (double, HWidth)
};

/*!
@param clipboard a GtkClipboard.
@param selection_data the data to paste.
@param pView the view of the active document.

A callback to use for receiving data from a clipboard. Calls View::OnReceive().
*/
void on_receive (GtkClipboard *clipboard, GtkSelectionData *selection_data, View * pView);

}	//	namespace gcp

#endif // GCHEMPAINT_VIEW_H
