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Class2.c
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C/C++ Source or Header
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1994-02-11
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7KB
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295 lines
#include "demo.h"
/***************************************************************************/
/* Here is the beginning of our simple new class... */
/***************************************************************************/
/*
** This class is the same as within Class1.c except that it features
** a pen attribute.
*/
struct MyData
{
LONG pen;
};
#define MYATTR_PEN 0x8022 /* tag value for the new attribute. */
/* use 0x8000 | <yourregnumber> as upper word! */
SAVEDS ULONG mNew(struct IClass *cl,Object *obj,Msg msg)
{
struct MyData *data;
if (!(obj = (Object *)DoSuperMethodA(cl,obj,msg)))
return(0);
data = INST_DATA(cl,obj);
/* parse initial taglist */
data->pen = GetTagData(MYATTR_PEN, TEXTPEN, ((struct opSet *)msg)->ops_AttrList);
return((ULONG)obj);
}
SAVEDS ULONG mDispose(struct IClass *cl,Object *obj,Msg msg)
{
/* OM_NEW didnt allocates something, just do nothing here... */
return(DoSuperMethodA(cl,obj,msg));
}
/*
** OM_SET method, we need to see if someone changed the pen attribute.
*/
SAVEDS ULONG mSet(struct IClass *cl,Object *obj,Msg msg)
{
struct MyData *data = INST_DATA(cl,obj);
struct TagItem *tags,*tag;
for (tags=((struct opSet *)msg)->ops_AttrList;tag=NextTagItem(&tags);)
{
switch (tag->ti_Tag)
{
case MYATTR_PEN:
data->pen = tag->ti_Data; /* set the new value */
MUI_Redraw(obj,MADF_DRAWOBJECT); /* redraw ourselves completely */
break;
}
}
return(DoSuperMethodA(cl,obj,msg));
}
/*
** OM_GET method, see if someone wants to read the color.
*/
static ULONG mGet(struct IClass *cl,Object *obj,Msg msg)
{
struct MyData *data = INST_DATA(cl,obj);
ULONG *store = ((struct opGet *)msg)->opg_Storage;
switch (((struct opGet *)msg)->opg_AttrID)
{
case MYATTR_PEN: *store = data->pen; return(TRUE);
}
return(DoSuperMethodA(cl,obj,msg));
}
SAVEDS ULONG mAskMinMax(struct IClass *cl,Object *obj,struct MUIP_AskMinMax *msg)
{
/*
** let our superclass first fill in what it thinks about sizes.
** this will e.g. add the size of frame and inner spacing.
*/
DoSuperMethodA(cl,obj,msg);
/*
** now add the values specific to our object. note that we
** indeed need to *add* these values, not just set them!
*/
msg->MinMaxInfo->MinWidth += 100;
msg->MinMaxInfo->DefWidth += 120;
msg->MinMaxInfo->MaxWidth += 500;
msg->MinMaxInfo->MinHeight += 40;
msg->MinMaxInfo->DefHeight += 90;
msg->MinMaxInfo->MaxHeight += 300;
return(0);
}
/*
** Draw method is called whenever MUI feels we should render
** our object. This usually happens after layout is finished
** or when we need to refresh in a simplerefresh window.
** Note: You may only render within the rectangle
** _mleft(obj), _mtop(obj), _mwidth(obj), _mheight(obj).
*/
SAVEDS ULONG mDraw(struct IClass *cl,Object *obj,struct MUIP_Draw *msg)
{
struct MyData *data = INST_DATA(cl,obj);
int i;
/*
** let our superclass draw itself first, area class would
** e.g. draw the frame and clear the whole region. What
** it does exactly depends on msg->flags.
*/
DoSuperMethodA(cl,obj,msg);
/*
** if MADF_DRAWOBJECT isn't set, we shouldn't draw anything.
** MUI just wanted to update the frame or something like that.
*/
if (!(msg->flags & MADF_DRAWOBJECT))
return(0);
/*
** ok, everything ready to render...
*/
SetAPen(_rp(obj),_dri(obj)->dri_Pens[data->pen]);
for (i=_mleft(obj);i<=_mright(obj);i+=5)
{
Move(_rp(obj),_mleft(obj),_mbottom(obj));
Draw(_rp(obj),i,_mtop(obj));
Move(_rp(obj),_mright(obj),_mbottom(obj));
Draw(_rp(obj),i,_mtop(obj));
}
return(0);
}
/*
** Here comes the dispatcher for our custom class. We only need to
** care about MUIM_AskMinMax and MUIM_Draw in this simple case.
** Unknown/unused methods are passed to the superclass immediately.
*/
SAVEDS ASM ULONG MyDispatcher(REG(a0) struct IClass *cl,REG(a2) Object *obj,REG(a1) Msg msg)
{
switch (msg->MethodID)
{
case OM_NEW : return(mNew (cl,obj,(APTR)msg));
case OM_DISPOSE : return(mDispose (cl,obj,(APTR)msg));
case OM_SET : return(mSet (cl,obj,(APTR)msg));
case OM_GET : return(mGet (cl,obj,(APTR)msg));
case MUIM_AskMinMax: return(mAskMinMax(cl,obj,(APTR)msg));
case MUIM_Draw : return(mDraw (cl,obj,(APTR)msg));
}
return(DoSuperMethodA(cl,obj,msg));
}
/***************************************************************************/
/* Thats all there is about it. Now lets see how things are used... */
/***************************************************************************/
int main(int argc,char *argv[])
{
APTR app,window,MyObj,SuperClass,cycle;
struct IClass *MyClass;
ULONG signals;
BOOL running = TRUE;
static char *penarray[] =
{
"Detailpen",
"Blockpen",
"Textpen",
"Shinepen",
"Shadowpen",
"Fillpen",
NULL
};
init();
/* Get a pointer to the superclass. MUI will lock this */
/* and prevent it from being flushed during you hold */
/* the pointer. When you're done, you have to call */
/* MUI_FreeClass() to release this lock. */
if (!(SuperClass=MUI_GetClass(MUIC_Area)))
fail(NULL,"Superclass for the new class not found.");
/* create the new class */
if (!(MyClass = MakeClass(NULL,NULL,SuperClass,sizeof(struct MyData),0)))
{
MUI_FreeClass(SuperClass);
fail(NULL,"Failed to create class.");
}
/* set the dispatcher for the new class */
MyClass->cl_Dispatcher.h_Entry = (APTR)MyDispatcher;
MyClass->cl_Dispatcher.h_SubEntry = NULL;
MyClass->cl_Dispatcher.h_Data = NULL;
app = ApplicationObject,
MUIA_Application_Title , "Class2",
MUIA_Application_Version , "$VER: Class2 1.0 (01.12.93)",
MUIA_Application_Copyright , "©1993, Stefan Stuntz",
MUIA_Application_Author , "Stefan Stuntz",
MUIA_Application_Description, "Demonstrate the use of custom classes.",
MUIA_Application_Base , "CLASS2",
SubWindow, window = WindowObject,
MUIA_Window_Title, "Another Custom Class",
MUIA_Window_ID , MAKE_ID('C','L','S','2'),
WindowContents, VGroup,
Child, cycle = KeyCycle(penarray,' '),
Child, MyObj = NewObject(MyClass,NULL,
TextFrame,
MUIA_Background, MUII_BACKGROUND,
TAG_DONE),
End,
End,
End;
if (!app)
fail(app,"Failed to create Application.");
DoMethod(window,MUIM_Notify,MUIA_Window_CloseRequest,TRUE,
app,2,MUIM_Application_ReturnID,MUIV_Application_ReturnID_Quit);
DoMethod(cycle,MUIM_Notify,MUIA_Cycle_Active,MUIV_EveryTime,
MyObj,3,MUIM_Set,MYATTR_PEN,MUIV_TriggerValue);
set(cycle,MUIA_Cycle_Active,TEXTPEN);
/*
** Input loop...
*/
set(window,MUIA_Window_Open,TRUE);
while (running)
{
switch (DoMethod(app,MUIM_Application_Input,&signals))
{
case MUIV_Application_ReturnID_Quit:
running = FALSE;
break;
}
if (running && signals) Wait(signals);
}
set(window,MUIA_Window_Open,FALSE);
/*
** Shut down...
*/
MUI_DisposeObject(app); /* dispose all objects. */
FreeClass(MyClass); /* free our custom class. */
MUI_FreeClass(SuperClass); /* release super class pointer. */
fail(NULL,NULL); /* exit, app is already disposed. */
}