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gadget_ScrollBar.c

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/*
 *    gui - [gega user interface] the flexible solution for user interface problems
 *    Copyright (C) 2002  Gergely Gati
 *
 *    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; version 2 of the License.
 *
 *    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *    Gergely Gati
 *      email:           g.gati@freemail.hu
 *      AIM screenname:  GatiGergely
 *      ICQ number:      93131690
 *
 */
/*
 *  ScrollBar.c
 *
 *  Author            : Gergely Gáti
 *  Date              :
 *  Description       :
 *
 */
#include <stdlib.h>

#include "Tag.h"
#include "macros.h"
#include "debug.h"
#include "classes.h"
#include "Bases.h"
#include "Module.h"
#include "Memory.h"
#include "xml_Gui.h"
#include "Common.h"

#include "gadgets/gadget_ScrollBar.h"
#include "gadgets/gadget_Scroller.h"
#include "gadgets/gadget_Icon.h"
#include "gadgets/gadget_Group.h"


struct _scrollbar
{
  Gadget_t gadget;
  Gadget_t *subtree;
};


static bases_Modules_t *api;
VERSION("ScrollBar.gadget",1,0,"Gergely Gati","g.gati@freemail.hu");


static gadget_Binding_t binding[]=
{
  GADGET_BINDING_DONE
};

static gadget_Check_t checklist[]=
{
 { GADGET_SUBGADGET_BASE+1, "Group", GADGET_REQUIRED },
 { GADGET_SUBGADGET_BASE+3, "Scroller", GADGET_REQUIRED },
 GADGET_CHECK_DONE
};


/*
 *  This function is always called after the Gadget_t has been created and
 *  attached to the Gadget_t tree, but before the call to compound_layout(). It may be
 *  called more than once. It must fill in the Gadget_t's minimum and maximum
 *  sizes into the supplied extent structures.
 */
static void scrollbar_get_extent(Gadget_t *this, Extent_t *min, Extent_t *max)
{
  debug_Begin();

  api->gadget_Call(GADGET_GET_EXTENT,TAG_GADGET_OBJECT,api->gadget_Call(GADGET_SEARCH,TAG_GADGET_ROOT,((scrollbar *)this)->subtree,TAG_GADGET_GADGET_ID,GADGET_SUBGADGET_BASE+1,TAG_DONE),TAG_GADGET_MIN,min,TAG_GADGET_MAX,max,TAG_DONE);

  debug_End();
}


/*
 *  This function is called always after compound_get_extent() has been called at
 *  least once. It receives a position and an extent which determine the
 *  position and the size of the Gadget_t on the screen. This extent is always
 *  between the minimum and maximum sizes which were returned by
 *  compound_get_extent() of the same gadget. After this call the Gadget_t is made
 *  visible.
 */
static void scrollbar_layout(Gadget_t *this, Rect_t *rect)
{
  debug_Begin();

  api->gadget_Call(GADGET_LAYOUT,TAG_GADGET_OBJECT,((scrollbar *)this)->subtree,TAG_GADGET_RECT,rect,TAG_DONE);

  debug_End();
}


int scrollbar_event_handler(Gadget_t *this, Gadget_t *sender, int event, u32 event_data)
{
  int ret=0;

  debug_Begin();

  switch(event)
  {
    case CBK_GADGET_UP:
    {
//      if(sender->gadget_id==(GADGET_SUBGADGET_BASE+2)) ret=gadget_callback(this,event,event_data);
      break;
    }
  }

  debug_End();

  return(ret);
}

#if 0
  static int scrollbar_input_event_handler(Gadget_t *gad, struct glw_Event *event)
  {
    int ret=0;

    debug_Begin();

    ret=api->gadget_Call(GADGET_POST_MESSAGE,TAG_GADGET_OBJECT,((scrollbar *)gad)->subtree,TAG_GADGET_EVENT,event,TAG_DONE);

    debug_End();

    return(ret);
  }
#endif


static int scrollbar_init_gadget(Gadget_t *this, tag *taglist)
{
  int ret=-1;
  char *gui_file;

  debug_Begin();

  if(NULL!=(gui_file=(char *)api->gui_Call(GUI_LOADSUBGADGETDESCRIPTOR,TAG_GUI_WIN,this->window,TAG_GUI_CLASS_NAME,this->class_data->class_name,TAG_DONE)))
  {
    if(NULL!=(((scrollbar *)this)->subtree=(Gadget_t *)api->gxml_Call(GXML_CREATEGADGETTREE,
              TAG_GXML_XML_FILE,gui_file,
              TAG_GXML_LOCALE,NULL,
              TAG_GXML_TYPE,"gadget",
              TAG_GXML_LAYOUTNAME,this->class_data->class_name,
              TAG_GXML_APPNAME,NULL,
              TAG_GXML_WINDOW,this->window,
              TAG_GXML_CHECK,checklist,
              TAG_DONE)))
    {
      api->gadget_Call(GADGET_ATTACH,TAG_GADGET_NEW_PARENT,this,TAG_GADGET_NEW_CHILD,((scrollbar *)this)->subtree,TAG_DONE);
      ret=0;
    }
    api->gui_Call(GUI_UNLOADSUBGADGETDESCRIPTOR,TAG_GUI_FILE,gui_file,TAG_DONE);
  }

  debug_End();

  return(ret);
}


static void scrollbar_suggest_extent(Gadget_t *this, Rect_t *rect)
{
  debug_Begin();

  api->gadget_Call(GADGET_SUGGEST_EXTENT,TAG_GADGET_OBJECT,((scrollbar *)this)->subtree,TAG_GADGET_RECT,rect,TAG_DONE);

  debug_End();
}


static int scrollbar_gadget_event_handler(Gadget_t *this, int event, tag *taglist)
{
  int ret=-1;

  debug_Begin();

  if(this!=NULL&&event>=0)
  {
    switch(event)
    {
      case GADEV_INIT_GADGET:
      {
        ret=scrollbar_init_gadget(this,taglist);
        break;
      }
      case GADEV_DELETE_GADGET:
      {
        ret=0;
        break;
      }
      case GADEV_GET_EXTENT:
      {
        Extent_t *min,*max,n,x;
        min=(Extent_t *)tag_GetTagData(taglist,TAG_GAD_EXTMIN,(u32)&n);
        max=(Extent_t *)tag_GetTagData(taglist,TAG_GAD_EXTMAX,(u32)&x);
        scrollbar_get_extent(this,min,max);
        ret=0;
        break;
      }
      case GADEV_SUGGEST_EXTENT:
      {
        Rect_t *rect,r;
        rect=(Rect_t *)tag_GetTagData(taglist,TAG_GAD_RECT,(u32)&r);
        scrollbar_suggest_extent(this,rect);
        ret=0;
        break;
      }
      case GADEV_LAYOUT:
      case GADEV_DAMAGE:
      {
        Rect_t *rect,r;
        rect=(Rect_t *)tag_GetTagData(taglist,TAG_GAD_RECT,(u32)&r);
        scrollbar_layout(this,rect);
        ret=0;
        break;
      }
      case GADEV_SAVE:
      {
        u8 **mem;
        int *size;
        mem=(u8 **)tag_GetTagData(taglist,TAG_GADGET_MEM,0L);
        size=(int *)tag_GetTagData(taglist,TAG_GADGET_SIZE,0L);
        break;
      }
      case GADEV_RESTORE:
      {
        u8 *mem;
        int size;
        mem=(u8 *)tag_GetTagData(taglist,TAG_GADGET_MEM,0L);
        size=(int)tag_GetTagData(taglist,TAG_GADGET_SIZE,0L);
        break;
      }
    }
  }

  debug_End();

  return(ret);
}


/*
 *  This function is called once before the creation of any Gadget_t of this
 *  class. Gadgets can be created only after this function has been called.
 */
static void init_scrollbar_class(u32 module)
{
  api->gadget_Call(GADGET_REGISTER_CLASS,
                            TAG_GADGET_CLASS_ID,CLASS_SCROLLBAR_ID,
                            TAG_GADGET_NAME,CLASS_SCROLLBAR_NAME,
                TAG_GADGET_BINDING,binding,
                TAG_GADGET_COLOR_NAMES,NULL,
                TAG_GADGET_CUSTOM_NAMES,NULL,
                TAG_GADGET_STATE_MASK,GADSTF_NORMAL,
                TAG_GADGET_MODULE,module,
                TAG_GADGET_GADGET_SIZE,sizeof(scrollbar),
                TAG_GADGET_METHODS,NULL,
                TAG_GADGET_INPUT_EVENT_HANDLER,NULL,
                TAG_GADGET_EVENT_HANDLER,scrollbar_event_handler,
                TAG_GADGET_GADGET_EVENT_HANDLER,scrollbar_gadget_event_handler,
                TAG_DONE);
}


EXPORT int module_Init(u32 module, bases_Modules_t *bases)
{
    api=bases;
    init_scrollbar_class(module);  return(0);
}

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