MUI_Boopsi

Boopsi.mui

Super class

Gadget.mui

Background

MUI's Boopsi class provides an interface to standard, system style BOOPSI gadgets. Since BOOPSI's gadgetclass misses some important features needed for an automatic layout system like MUI, there are several problems with such an interface. MUI tries to solve these problems with some additional attributes.

Coming with release 3.x of the Amiga operating system are some very nice BOOPSI gadgets such as "colorwheel.gadget" or "gradientslider.gadget". With MUI's Boopsi class, you can use these gadgets just as if they were MUI objects.

You can talk to a MUIized BOOPSI object as if it was the BOOPSI object itself. MUI will pass through all attributes and try to be completely transparent. Additionally, if a BOOPSI object generates notification events via IDCMP_UPDATE, MUI turns them into MUI notification events. Thus, you can e.g. react on the change of WHEEL_Saturation in a MUI colorwheel BOOPSI gadget as on any other MUI attribute.

An example program "BoopsiDoor.c" is provided to show how this magic works.

NOTES

OS 3.0/3.1 colorwheel.gadget can accidently render itself one pixel too big, overwriting other parts of the window. As a workaround, MUI will subtract one from the width/height before passing it on to a colorwheel BOOPSI object.

Attributes

Attribute	Version	ISG	Type
MUIA_Boopsi_Class	V4	ISG	struct IClass *
MUIA_Boopsi_ClassID	V4	ISG	STRPTR
MUIA_Boopsi_MaxHeight	V4	ISG	ULONG
MUIA_Boopsi_MaxWidth	V4	ISG	ULONG
MUIA_Boopsi_MinHeight	V4	ISG	ULONG
MUIA_Boopsi_MinWidth	V4	ISG	ULONG
MUIA_Boopsi_Object	V4	..G	Object *
MUIA_Boopsi_Remember	V4	I..	ULONG
MUIA_Boopsi_Smart	V9	I..	BOOL
MUIA_Boopsi_TagDrawInfo	V4	ISG	ULONG
MUIA_Boopsi_TagScreen	V4	ISG	ULONG
MUIA_Boopsi_TagWindow	V4	ISG	ULONG

MUIA_Boopsi_Class

NAME

MUIA_Boopsi_Class -- V4 [ISG], struct IClass *, 0x80426999

FUNCTION

Pointer to the (private) class you want to create a BOOPSI object from. Only useful if you previously generated your own BOOPSI class with MakeClass().

Of course you may not free the class until you're done with your object.

SEE ALSO

MUIA_Boopsi_ClassID

MUIA_Boopsi_ClassID

NAME

MUIA_Boopsi_ClassID -- V4 [ISG], STRPTR, 0x8042bfa3

FUNCTION

MUIA_Boopsi_ClassID specifies the name for the public BOOPSI class you want to create an object of. It will only be used when MUIA_Boopsi_Class is NULL.

The public class must be in memory before you can create an instance of it, you will have to open the required class library by hand.

Note the string given to MUIA_Boopsi_ClassID must remain valid until you're done with the object.

EXAMPLE

/* Complete example code can be found in BoopsiDoor.c */

cwbase = OpenLibrary("gadgets/colorwheel.gadget",0);

Wheel = BoopsiObject,  /* MUI and Boopsi tags mixed */
  NeXTFrame,
  MUIA_Boopsi_ClassID  , "colorwheel.gadget",
  MUIA_Boopsi_MinWidth , 30, /* BOOPSI objects don't know */
  MUIA_Boopsi_MinHeight, 30, /* their sizes, so we help   */
  MUIA_Boopsi_Remember , WHEEL_Saturation, /* keep important values */
  MUIA_Boopsi_Remember , WHEEL_Hue,        /* during window resize  */
  MUIA_Boopsi_TagScreen, WHEEL_Screen, /* this magic fills in */
  WHEEL_Screen         , NULL,         /* the screen pointer  */
  GA_Left     , 0,
  GA_Top      , 0, /* MUI will automatically     */
  GA_Width    , 0, /* fill in the correct values */
  GA_Height   , 0,
  ICA_TARGET  , ICTARGET_IDCMP, /* needed for notification */
  End;
...

MUI_DisposeObject(wheel);
CloseLibrary(cwbase);

SEE ALSO

MUIA_Boopsi_Class

MUIA_Boopsi_MaxHeight

NAME

MUIA_Boopsi_MaxHeight -- V4 [ISG], ULONG, 0x8042757f

FUNCTION

For MUI's automatic layout system, it's required that objects know their minimum and maximums sizes. Since BOOPSI gadgets don't support this feature, you will have to help MUI and adjust these values by hand.

Defaults: MUIA_Boopsi_MinWidth - 1 pixel MUIA_Boopsi_MinHeight - 1 pixel MUIA_Boopsi_MaxWidth - unlimited MUIA_Boopsi_MaxHeight - unlimited

EXAMPLE

see MUIA_Boopsi_ClassID

SEE ALSO

MUIA_Boopsi_ClassID

MUIA_Boopsi_MaxWidth

NAME

MUIA_Boopsi_MaxWidth -- V4 [ISG], ULONG, 0x8042bcb1

FUNCTION

For MUI's automatic layout system, it's required that objects know their minimum and maximums sizes. Since BOOPSI gadgets don't support this feature, you will have to help MUI and adjust these values by hand.

Defaults: MUIA_Boopsi_MinWidth - 1 pixel MUIA_Boopsi_MinHeight - 1 pixel MUIA_Boopsi_MaxWidth - unlimited MUIA_Boopsi_MaxHeight - unlimited

EXAMPLE

see MUIA_Boopsi_ClassID

SEE ALSO

MUIA_Boopsi_ClassID

MUIA_Boopsi_MinHeight

NAME

MUIA_Boopsi_MinHeight -- V4 [ISG], ULONG, 0x80422c93

FUNCTION

For MUI's automatic layout system, it's required that objects know their minimum and maximums sizes. Since BOOPSI gadgets don't support this feature, you will have to help MUI and adjust these values by hand.

Defaults: MUIA_Boopsi_MinWidth - 1 pixel MUIA_Boopsi_MinHeight - 1 pixel MUIA_Boopsi_MaxWidth - unlimited MUIA_Boopsi_MaxHeight - unlimited

EXAMPLE

see MUIA_Boopsi_ClassID

SEE ALSO

MUIA_Boopsi_ClassID

MUIA_Boopsi_MinWidth

NAME

MUIA_Boopsi_MinWidth -- V4 [ISG], ULONG, 0x80428fb2

FUNCTION

For MUI's automatic layout system, it's required that objects know their minimum and maximums sizes. Since BOOPSI gadgets don't support this feature, you will have to help MUI and adjust these values by hand.

Defaults: MUIA_Boopsi_MinWidth - 1 pixel MUIA_Boopsi_MinHeight - 1 pixel MUIA_Boopsi_MaxWidth - unlimited MUIA_Boopsi_MaxHeight - unlimited

EXAMPLE

see MUIA_Boopsi_ClassID

SEE ALSO

MUIA_Boopsi_ClassID

MUIA_Boopsi_Object

NAME

MUIA_Boopsi_Object -- V4 [..G], Object *, 0x80420178

FUNCTION

No input, just an output since this attribute is only getable. What MUI returns when generating a BoopsiObject is a standard MUI object, not a pointer to the BOOPSI gadget itself. In case you really need this BOOPSI gadget pointer, you can obtain it by getting MUIA_Boopsi_Object from the MUI object.

Since MUI passes along every unknown attribute to the BOOPSI gadget, there should be no need for this tag anyway.

Note that the BOOPSI object pointer is only valid when the window is open!

SEE ALSO

MUIA_Boopsi_Class, MUIA_Boopsi_ClassID

MUIA_Boopsi_Remember

NAME

MUIA_Boopsi_Remember -- V4 [I..], ULONG, 0x8042f4bd

FUNCTION

Most BOOPSI objects are kind of silly, they don't support automatic resizing or jumping from screen to screen. Therefor, MUI sometimes needs to dispose and regenerate a BOOPSI object. This will result in loosing the current state of the object, e.g. saturation and hue values in a colorwheel.

To solve this problem, you can tell MUI what attributes must be remembered during dispose/regeneration. For a colorwheel, this would e.g. be WHEEL_Saturation and WHEEL_Hue.

Before disposing the BOOPSI object, the remember tags are read and stored in a private buffer. After regeneration, the contents of this buffer are passed back to the BOOPSI object again.

Note that you can define up to five MUIA_Boopsi_Remember tags.

BUGS

The remember procedure will not work when the attributes you want to remember are just pointers to data stored somewhere in the BOOPSI object.

EXAMPLE

see MUIA_Boopsi_ClassID

SEE ALSO

MUIA_Boopsi_ClassID

MUIA_Boopsi_Smart

NAME

MUIA_Boopsi_Smart -- V9 [I..], BOOL, 0x8042b8d7

FUNCTION

Specify TRUE for smart BOOPSI gadgets that allow resizing, e.g. the textfield.class. In this case, MUI will not dispose and recreate the object.

MUIA_Boopsi_TagDrawInfo

NAME

MUIA_Boopsi_TagDrawInfo -- V4 [ISG], ULONG, 0x8042bae7

FUNCTION

Unfortunately, most BOOPSI gadgets need information on the display environment they will reside in at object creation time. Due to MUI's concept, this information is not available that early.

To solve this problem, MUI doesn't generate the BOOPSI object instantly, creation is delayed until the window containing the gadget is opened.

At this time, MUI fills some values about display environment into the BOOPSI objects creation tag list. You have to tell MUI, what tags are actually needed.

With MUIA_Boopsi_TagDrawInfo you can tell MUI where to fill in a needed DrawInfo structure.

EXAMPLE

If your BOOPSI gadget needs a pointer to a DrawInfo structure supplied with the MYBOOPSI_DrawInfo tag, you would have to specify

BoopsiObject,
  RecessedFrame,
  ...
  MUIA_Boopsi_TagDrawInfo, MYBOOPSI_DrawInfo,
  ...
  MYBOOPSI_DrawInfo, 0, /* will be filled later by MUI */
  ...
  GA_Left  , 0, /* needs to be there, will */
  GA_Top   , 0, /* be filled later by MUI  */
  GA_Width , 0,
  GA_Height, 0,
  End;

SEE ALSO

MUIA_Boopsi_ClassID, MUIA_Boopsi_TagScreen, MUIA_Boopsi_TagWindow

MUIA_Boopsi_TagScreen

NAME

MUIA_Boopsi_TagScreen -- V4 [ISG], ULONG, 0x8042bc71

FUNCTION

Unfortunately, most BOOPSI gadgets need information on the display environment they will reside in at object creation time. Due to MUI's concept, this information is not available that early.

To solve this problem, MUI doesn't generate the BOOPSI object instantly, creation is delayed until the window containing the gadget is opened.

At this time, MUI fills some values about display environment into the BOOPSI objects creation tag list. You have to tell MUI, what tags are actually needed.

With MUIA_Boopsi_TagScreen you can tell MUI where to fill in a needed Screen structure.

EXAMPLE

If your BOOPSI gadget needs a pointer to a Screen structure supplied with the MYBOOPSI_Screen tag, you would have to specify

BoopsiObject,
  RecessedFrame,
  ...
  MUIA_Boopsi_TagScreen, MYBOOPSI_Screen,
  ...
  MYBOOPSI_Screen, 0, /* will be filled later by MUI */
  ...
  GA_Left  , 0, /* needs to be there, will */
  GA_Top   , 0, /* be filled later by MUI  */
  GA_Width , 0,
  GA_Height, 0,
  End;

SEE ALSO

MUIA_Boopsi_ClassID, MUIA_Boopsi_TagDrawInfo, MUIA_Boopsi_TagWindow

MUIA_Boopsi_TagWindow

NAME

MUIA_Boopsi_TagWindow -- V4 [ISG], ULONG, 0x8042e11d

FUNCTION

Unfortunately, most BOOPSI gadgets need information on the display environment they will reside in at object creation time. Due to MUI's concept, this information is not available that early.

To solve this problem, MUI doesn't generate the BOOPSI object instantly, creation is delayed until the window containing the gadget is opened.

At this time, MUI fills some values about display environment into the BOOPSI objects creation tag list. You have to tell MUI, what tags are actually needed.

With MUIA_Boopsi_TagWindow you can tell MUI where to fill in a needed Window structure.

EXAMPLE

If your BOOPSI gadget needs a pointer to a Window structure supplied with the MYBOOPSI_Window tag, you would have to specify

BoopsiObject,
  RecessedFrame,
  ...
  MUIA_Boopsi_TagWindow, MYBOOPSI_Window,
  ...
  MYBOOPSI_Window, 0, /* will be filled later by MUI */
  ...
  GA_Left  , 0, /* needs to be there, will */
  GA_Top   , 0, /* be filled later by MUI  */
  GA_Width , 0,
  GA_Height, 0,
  End;

SEE ALSO

MUIA_Boopsi_ClassID, MUIA_Boopsi_TagDrawInfo, MUIA_Boopsi_TagWindow

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Updated: 14-Jan-2021