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- #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,cycle;
- struct MUI_CustomClass *mcc;
- ULONG signals;
- BOOL running = TRUE;
- static char *penarray[] =
- {
- "Detailpen",
- "Blockpen",
- "Textpen",
- "Shinepen",
- "Shadowpen",
- "Fillpen",
- NULL
- };
-
- init();
-
- /* Create the new custom class with a call to MUI_CreateCustomClass(). */
- /* Caution: This function returns not a struct IClass, but a */
- /* struct MUI_CustomClass which contains a struct IClass to be */
- /* used with NewObject() calls. */
- /* Note well: MUI creates the dispatcher hook for you, you may */
- /* *not* use its h_Data field! If you need custom data, use the */
- /* cl_UserData of the IClass structure! */
-
- if (!(mcc = MUI_CreateCustomClass(NULL,MUIC_Area,NULL,sizeof(struct MyData),MyDispatcher)))
- fail(NULL,"Could not create custom class.");
-
- 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(mcc->mcc_Class,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. */
- MUI_DeleteCustomClass(mcc); /* delete the custom class. */
- fail(NULL,NULL); /* exit, app is already disposed. */
- }
-