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<h1>Source: hk_classes/hk_classes/hk_dsvisible.h</h1>
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// ****************************************************************************
// copyright (c) 2000-2002 Horst Knorr <hk_classes@knoda.org>
// This file is part of the hk_classes library.
// This file may be distributed and/or modified under the terms of the
// GNU Library Public License version 2 as published by the Free Software
// Foundation and appearing in the file COPYING included in the
// packaging of this file.
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
// ****************************************************************************
#ifndef HK_DSVISIBLE
#define HK_DSVISIBLE
#include <hk_definitions.h>
#include <hk_visible.h>
#include <hk_datetime.h>
using namespace std;
class hk_dsvisiblemodeprivate;
class hk_dsvisibleprivate;
/**
*
*@short base class for visible widgets without column data connection
*@version $Revision: 1.2 $
*@author Horst Knorr (hk_classes@knoda.org)
*This is the base class for visible widgets which do not need access to the data,
*but do have to know whether or not a datasource is enabled and which row is the actual one.
*/
class hk_dsvisible:public hk_visible
{
friend class hk_datasource;
public:
hk_dsvisible(hk_presentation* presentation=NULL);
virtual ~hk_dsvisible(void);
virtual void set_datasource(hk_datasource* d);
virtual bool set_presentationdatasource(long n, bool registerchange=true);
long presentationdatasource(void);
hk_datasource* datasource(void);
virtual void savedata(ostream& s, bool savedatasource,bool saveall);
virtual void savedata(ostream& s );
virtual void loaddata(const hk_string& definition);
void set_readonly(bool readonly);
bool is_readonly(void) const;
/**
* sets the script for the before_row_change action
* The before_row_change action before the current row changes
*/
void set_before_row_change_action(const hk_string&, bool registerchange=true);
hk_string before_row_change_action(void);
/**
* sets the script for the after_row_change action
* The after_row_change action after the current row changes
*/
void set_after_row_change_action(const hk_string&, bool registerchange=true);
hk_string after_row_change_action(void);
/**
* sets the script for the before_update action
* The before_update action before data changes will be stored
*/
void set_before_update_action(const hk_string&, bool registerchange=true);
hk_string before_update_action(void);
/**
* sets the script for the after_update action
* The after_update action after data changes will be stored
*/
void set_after_update_action(const hk_string&, bool registerchange=true);
hk_string after_update_action(void);
/**
* sets the script for the before_delete action
* The before_delete action before the current row will be deleted
*/
void set_before_delete_action(const hk_string&, bool registerchange=true);
hk_string before_delete_action(void);
/**
* sets the script for the after_delete action
* The after_delete action after the current row was deleted
*/
void set_after_delete_action(const hk_string&, bool registerchange=true);
hk_string after_delete_action(void);
/**
* sets the script for the before_insert action
* The before_insert action before a new row will be inserted
*/
void set_before_insert_action(const hk_string&, bool registerchange=true);
hk_string before_insert_action(void);
/**
* sets the script for the after_insert action
* The after_insert action after a new row was inserted
*/
void set_after_insert_action(const hk_string&, bool registerchange=true);
hk_string after_insert_action(void);
protected:
void row_change(void);
void insert_mode(void);
/**
*FOR WIDGET DEVELOPERS ONLY:
* will be automatically called when the datasource will be set to insert_mode.
*Has to be rewritten for a new widget
* @see before_row_change.
*
*/
virtual void widget_specific_insert_mode(void){}
/**
*FOR WIDGET DEVELOPERS ONLY:
* will be automatically called when the datasource has changed the row.
*Has to be rewritten for a new widget
* @see before_row_change.
*
*/
virtual bool widget_specific_row_change(void) {return false;}
/**
*FOR WIDGET DEVELOPERS ONLY:
* defines whether the widget should be enabled or disabled. Has to be rewritten
* for a new widget
*/
virtual void widget_specific_enable_disable(void){}
virtual void widget_specific_enable(void){}
virtual void widget_specific_disable(void){}
virtual void widget_specific_row_added(void){}
virtual void widget_specific_row_deleted(void){}
/**
*FOR WIDGET DEVELOPERS ONLY:
*called from hk_datasource before it tries to change the row or disable
*widget can i.e. store changed data there
*/
virtual void before_row_change(void);
virtual void before_store_changed_data(void);
virtual void after_store_changed_data(void);
virtual void before_insert_row(void){}
virtual void before_datasource_enables(void){}
/**
*FOR WIDGET DEVELOPERS ONLY:
*will be automatically called when the datasources is disabling
*/
virtual bool datasource_disable(void);
/**
*FOR WIDGET DEVELOPERS ONLY:
*will be automatically called when the datasources is enabling
*/
virtual bool datasource_enable(void);
/**
*FOR WIDGET DEVELOPERS ONLY:
*will be automatically called when the datasources is destroyed
*/
virtual void datasource_delete(void);
/**
*FOR WIDGET DEVELOPERS ONLY:
*will be automatically called when the datasources creates new columns
*i.e.when enabling,disabling or when a depending datasource has to requery
*its rows.
*/
virtual void row_added(void);
virtual void row_deleted(void);
virtual bool columns_new_created(void){return true;}
virtual void list_changes(filetype type);
/**
*FOR WIDGET DEVELOPERS ONLY:
*will be automatically called before the columns will be deleted.
*usually column pointers will be set to NULL in this function.
*i.e.when enabling,disabling or when a depending datasource has to requery
*its rows.
*/
virtual bool before_columns_deleted(void){return true;}
/**
*FOR WIDGET DEVELOPERS ONLY:
*will be automatically called after the columnstructure of a table
*was successfully altered.
*/
virtual bool table_structure_changes(void){return true;}
/**
*FOR WIDGET DEVELOPERS ONLY:
*will be automatically called before the database will be closed.(i.e when a new database will
*be created and the old one will be destroyed by hk_connection
*/
virtual void before_source_vanishes(void);
/**
*FOR WIDGET DEVELOPERS ONLY:
*will be automatically called before the presentationdatasource will be set
*/
virtual void widget_specific_presentationdatasource(long){}
virtual void presentationmode_changed(void);
hk_datasource* p_datasource;
hk_datetime p_date;
#ifdef HK_DEBUG
hk_string debug_p_columnname;
#endif
private:
void action_before_store_changed_data(void);
void action_after_store_changed_data(void);
void action_before_row_change(void);
void action_after_row_change(void);
void action_before_delete(void);
void action_after_delete(void);
void action_before_insert(void);
void action_after_insert(void);
hk_dsvisiblemodeprivate* p_designdata;
hk_dsvisiblemodeprivate* p_viewdata;
hk_dsvisibleprivate* p_private;
//p_already_handled is used from hk_datasource in bulk operations to find out if this object has been already handled.
bool p_already_handled;
};
#endif
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