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!AWJan95/Goodies/Event/Docs/Events

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

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File contents
PROCshell_AttachPaletteChangeHandler()
Params =>
         str function name

Registers a function name to be called when a PaletteChange
message is received. This occurs when the user has finished
dragging the sliders on the Palette application, or when a
new palette is loaded. It is also called when the handler is
set up so that the user application can note the current
parameters.

Note that this message is not issued when the screen mode
changes, so tasks interested in colour mapping changes should
call PROCshell_AttachModeChangeHandler as well.

User FN (PROCshell_AttachPaletteChangeHandler)
Params =>
         None

This function is called when a PaletteChange message is
received and also when PROCshell_AttachPaletteChangeHandler
is called.

--------------------------------------------------------

PROCshell_AttachModeChangeHandler()
Params =>
         str function name

Registers a function name to be called when a ModeChange
message is received. This allows the application to check
any mode-specific parameters such as screen width etc. It
is also called when the handler is set up so that the user
application can note the current parameters.

User FN (PROCshell_AttachModeChangeHandler) 
Params => 
         None 
 
This function is called when a ModeChange message is
received and also when PROCshell_AttachModeChangeHandler
is called

--------------------------------------------------------

PROCshell_AttachTaskInitialiseHandler()
Params =>
         str function name

Registers a function name to be called when a TaskInitialise
message is received. This allows the application to keep
track of any new tasks started after it.

User FN (PROCshell_AttachTaskInitialiseHandler) 
Params => 
         None 
 
This function is called when a TaskInitialise  message is
received.

--------------------------------------------------------

PROCshell_AttachTaskCloseDownHandler()
Params =>
         str function name

Registers a function name to be called when a TaskCloseDown
message is received.This message is sent when a task (other
than the current one) is killed.

User FN (PROCshell_AttachTaskCloseDownHandler)
Params => 
         None 
 
This function is called when a TaskCloseDown message is
received.

--------------------------------------------------------

PROCshell_AttachPane()
Params =>
         int window handle
         int pane handle
         int pane flags
         int x offset of pane relative to parent window
         int y offset of pane relative to parent window

Pane Flags (PROCshell_AttachPane)
0 = attached to parent window work area
1 = not used
2 = attached to left edge
3 = attached to bottom edge
4 = attached to right edge
5 = attached to top edge

If necessary the window flags of the pane window are
changed so that the 'pane' bit is on and the 'moveable'
bit is off, so that editing the template file is not
required.

--------------------------------------------------------

PROCshell_AttachDataLoad()
Attaches a dataload handler to a window/icon pair.

Params =>
         int  window handle
         int  icon handle
         int  filetype to recognise and optionally
              load (see no load flag)
         str  function name
         bool no load flag

Note that it is possible to call this function for
the same window/icon pair more than once giving
different filetypes (and function names if required)
to allow the handling of multiple filetypes.

User FN (PROCshell_AttachDataLoad)
Params =>
         int address file has been loaded at
         int filetype of file
         str full pathname of file
         int file size (from dataload message)

Note that if the event was attached with the
no load flag set to TRUE the address will
be -1 and the user application is expected to
actually load the file.

DataLoad 'No Load' flag
FALSE = data file is loaded in a heap block and
        the name and address is returned to the
        user application.

TRUE  = only the data file name and type is
        returned to the user application.

This flag is provided for maximum flexibility
when dealing with drag loads. When you are
converting an existing program to run under the
EvntShell system you may already have a working
load routine. In this case set the flag to TRUE
and when a drag load occurs your application will
be told the filename, which may then be loaded
and processed as required.

When this flag is FALSE the library routines will
reserve a memory block for the file and load it
automatically.

For the technical of you out there the library
stores the status of the no load flag in the top
bit of the filetype number. This will end in tears
when RISC-OS 4 comes out...

--------------------------------------------------------

PROCshell_AttachDataSave()
Attaches a datasave handler to a window/icon pair. A
typical use would be in a 'Save As' dialog box, the
icon handle being that of the 'File Type' icon.
 
Params =>
         int window handle
         int icon handle
         int address of heapblock holding data or
             the estimated file size
         int file type for saved file
         int icon nr of filename icon
         str function name (optional if data
             is held in a heapblock)

If icon 0 in the window is clicked on then a check
is made that the filename icon contains a valid
path name, generating an error if it does not.

Note that the third parameter can point to a heap
block containing the data to save which means that
the data must exist in the block (or at least the
block must exist and be the correct size) before
this routine is called. If this parameter is >&8000
it is taken to be a pointer to the heap block , and
the name of the function to perform the save is
optional.

Alternatively this parameter can be an estimated
file size (i.e. <&8000) in which case the user
function may write directly into the file whose
name is given as a parameter to the function. RAM
transfer is not possible if this is the case.

The button type of the filetype icon is automatically
changed to click/drag.

User FN (PROCshell_AttachDataSave)
Params =>
         str full filename of file

This function is not called if the file is stored
in a heap block. In this case the whole contents of
the heap block are transferred.

Estimated File Sizes
It should (if other applications are written to
the Acorn guidelines!) not matter if this estimate
is inaccurate. However, file transfer will be a
little faster if it is accurate and problems may
occur with badly written applications if it is not.

--------------------------------------------------------

PROCshell_AttachClickSelect()
Params =>    
         int window handle       
         int icon handle 
         str function name

User FN (PROCshell_AttachClickSelect)
Params => 
         int window handle
         int icon handle

--------------------------------------------------------

PROCshell_AttachClickAdjust()
Params =>     
         int window handle           
         int icon handle  
         str function name

User FN (PROCshell_AttachClickAdjust)
Params => 
         int window handle
         int icon handle

--------------------------------------------------------

PROCshell_AttachUserRedraw()
Params =>      
         int window handle      
         str function name

A check is made to ensure that the 'Auto redraw' flag of
the window is off, and the flag is cleared automatically
if necessary (i.e. you don't have to use !FormEd or
similar to set the flag correctly)

User FN (PROCshell_AttachUserRedraw)
Params => 
         int address of block returned by redraw
             request
         int x origin of window (screen coords)
         int y origin of window (screen coords)
 
The function to call when a redraw request
is made.

--------------------------------------------------------

PROCshell_AttachDrag()
Params =>        
         int window handle        
         int icon handle     
         str function name


User FN (FNshell_AttachDrag)
Params =>
         int window handle over which drag
             started
         int icon handle over which drag was
             started (-1 for no icon)
 
--------------------------------------------------------

PROCshell_AttachHelpTag()
Params =>         
         int window handle         
         int icon handle      
         str <message tag=>MessageTag>

Note that any message tags found in icon
validation strings override tags set up by
this routine.

--------------------------------------------------------

PROCWimpCloseDown
Params =>
         None

Not used in EvntShell library - use <PROCshell_WimpCloseDown_I> instead.

--------------------------------------------------------

PROCshell_WimpCloseDown_I
Params => 
         None

Called when the application shuts down (the library calls
this automatically)

--------------------------------------------------------

PROCshell_AttachBumpHandler()
Params =>     
         int  window handle
         int  icon handle (display value)
         int  icon handle (increment value)
         int  icon handle (decrement value)
         int  lower limit
         int  upper limit
         int  step
         bool wrap flag
         str  function name 1 (can be "")
         str  function name 2 (can be "")

Bump icons are the arrows that allow you to alter the
value displayed in an icon (usually but not necessarily
a writable one). Note that a click on a bump icon with
ADJUST has the opposite effect to a click with SELECT.

User FN1 (PROCshell_AttachBumpHandler)
Params => 
         int value
         int mouse button pressed (SELECT = 4,
             ADJUST = 1
       <=
         str converted value

This function is called before the new value
is placed in the display icon. 

An example would be converting an integer
value to the format 0h00 (i.e hours and mins).

DEF FN_dis_fn(val%)
=STR$(val%DIV60)+"h"+RIGHT$("00"+STR$(val%MOD60),2)

See the !VBase2 demo app.

User FN2 (PROCshell_AttachBumpHandler)
Params => 
         str value to decode

       <=
         int converted value

This function is called before the new value
is placed in the display icon.

An example would be converting a string "0h00"
back to an integer value.

DEF FN_decode_dis(val$)
=VAL(val$)*60+VAL(RIGHT$(val$,2))

See the !VBase2 demo app.

--------------------------------------------------------

PROCshell_AttachHotKey()
Params =>
         str  key
         bool shift flag
         bool ctrl  flag
         bool alt   flag
         str  window identifier
         int  window handle
         str  function name
         str  function name

Sets up a 'hotkey' event. Function keys F0-F11
(note NOT F12 as the task manager uses it under
RISC-OS 3) are supported.

User FN (PROCshell_AttachHotKey)
Params => 
         int window handle
 
The function to call before opening the window.
A function name of "" may be used if you don't
need to call a function. This would normally be
used to fill in icon fields and set the state
of radio buttons

User FN (PROCshell_AttachHotKey)
Params => 
         int window handle
 
The function to call after opening the window.
A function name of "" may be used if you don't
need to call a function.

Key (PROCshell_AttachHotKey)
The key string normally consists of one ASCII
character i.e. "R". When the ctrl flag is set
this would cause the actions to be carried out
when CTRL-R is pressed.

The string may also contain "F1" to "F11" to
allow function keys to be used. No checking is
performed on the string.

Window (PROCshell_AttachHotKey)
The window identifier specifies the name
of the window you want to appear when the
keypress is received. This parameter is
optional as you might not always want to
open a window.

The window is a 'dynamic' dialog box which
will disappear when <ESC> is pressed and
is opened in such a position that the mouse
pointer is in the middle of the window
(where possible).

Window Handle (shell_AttachHotKey)
When this is >0 then the window
created will be static i.e. it will not
be removed when the mouse is clicked
outside it, or when <ESC> is pressed.

--------------------------------------------------------

PROCshell_DoBackgroundTask
Params =>
         None

Called everytime a null reason code is received

--------------------------------------------------------

PROCshell_HandleUnknownMessage()
Params =>
         int address of message block

Called every time an unknown message is received.

--------------------------------------------------------

PROCshell_AttachCloseWindowHandler()
Params =>
         int window handle
         str function name

Registers a function name to be called when an 
CloseWindow message is received. This is useful
to prevent the window closing if so doing
would involve loss of data.

This message is issued when the window close
icon is clicked on.

User FN (PROCshell_AttachCloseWindowHandler)
Params => 
         None 

       <=
         bool 0 to disallow close, non 0 to
              close

--------------------------------------------------------

PROCshell_AttachOpenWindowHandler()
Params =>
         int window handle
         str function name

Registers a function name to be called when an 
OpenWindow message is received. This is useful
so that the application can set a flag to
avoid doing window redraws while the window is
closed for example.

This message is issued when the window is
dragged around the screen as well as when
the program opens the window. You should avoid
doing time consuming stuff in the function that
is called therefore.

User FN (PROCshell_AttachOpenWindowHandler)
Params => 
         None 

       <=
         bool 0 to disallow open, non 0 to
              open
              
--------------------------------------------------------

PROCshell_AttachPreQuitHandler()
Params =>
         str function name

Registers a function name to be called when a 
PreQuit message is received. This gives the
application a chance to save data or abort
the shutdown.

This message is issued when the task is quit
from the Task Manager, or when CTRL-SHIFT-F12
is pressed (under RISC OS 3).

User FN (PROCshell_AttachPreQuitHandler)
Params => 
         None 

       <=
         bool non 0 to allow quit, 0 to
              cancel quit

This function is called when a PreQuit
message is received.

--------------------------------------------------------
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00000010  68 50 61 6c 65 74 74 65  43 68 61 6e 67 65 48 61  |hPaletteChangeHa|
00000020  6e 64 6c 65 72 28 29 0a  50 61 72 61 6d 73 20 3d  |ndler().Params =|
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00000080  74 74 65 43 68 61 6e 67  65 0a 6d 65 73 73 61 67  |tteChange.messag|
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000000e0  65 20 50 61 6c 65 74 74  65 20 61 70 70 6c 69 63  |e Palette applic|
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00000100  0a 6e 65 77 20 70 61 6c  65 74 74 65 20 69 73 20  |.new palette is |
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000002f0  65 64 2e 0a 0a 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |ed...-----------|
00000300  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
00000320  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 0a 0a 50  |-------------..P|
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000003e0  6f 6e 20 74 6f 20 63 68  65 63 6b 0a 61 6e 79 20  |on to check.any |
000003f0  6d 6f 64 65 2d 73 70 65  63 69 66 69 63 20 70 61  |mode-specific pa|
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00000430  6c 6c 65 64 20 77 68 65  6e 20 74 68 65 20 68 61  |lled when the ha|
00000440  6e 64 6c 65 72 20 69 73  20 73 65 74 20 75 70 20  |ndler is set up |
00000450  73 6f 20 74 68 61 74 20  74 68 65 20 75 73 65 72  |so that the user|
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00000470  20 6e 6f 74 65 20 74 68  65 20 63 75 72 72 65 6e  | note the curren|
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00000490  73 65 72 20 46 4e 20 28  50 52 4f 43 73 68 65 6c  |ser FN (PROCshel|
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000004b0  67 65 48 61 6e 64 6c 65  72 29 20 0a 50 61 72 61  |geHandler) .Para|
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000004e0  63 74 69 6f 6e 20 69 73  20 63 61 6c 6c 65 64 20  |ction is called |
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00000540  6e 64 6c 65 72 0a 69 73  20 63 61 6c 6c 65 64 0a  |ndler.is called.|
00000550  0a 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |.---------------|
00000560  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
00000580  2d 2d 2d 2d 2d 2d 2d 2d  2d 0a 0a 50 52 4f 43 73  |---------..PROCs|
00000590  68 65 6c 6c 5f 41 74 74  61 63 68 54 61 73 6b 49  |hell_AttachTaskI|
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00000710  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
00000740  2d 2d 2d 0a 0a 50 52 4f  43 73 68 65 6c 6c 5f 41  |---..PROCshell_A|
00000750  74 74 61 63 68 54 61 73  6b 43 6c 6f 73 65 44 6f  |ttachTaskCloseDo|
00000760  77 6e 48 61 6e 64 6c 65  72 28 29 0a 50 61 72 61  |wnHandler().Para|
00000770  6d 73 20 3d 3e 0a 20 20  20 20 20 20 20 20 20 73  |ms =>.         s|
00000780  74 72 20 66 75 6e 63 74  69 6f 6e 20 6e 61 6d 65  |tr function name|
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000007a0  6e 63 74 69 6f 6e 20 6e  61 6d 65 20 74 6f 20 62  |nction name to b|
000007b0  65 20 63 61 6c 6c 65 64  20 77 68 65 6e 20 61 20  |e called when a |
000007c0  54 61 73 6b 43 6c 6f 73  65 44 6f 77 6e 0a 6d 65  |TaskCloseDown.me|
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*
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*
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*
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000034d0  0a 0a 55 73 65 72 20 46  4e 20 28 50 52 4f 43 73  |..User FN (PROCs|
000034e0  68 65 6c 6c 5f 41 74 74  61 63 68 4f 70 65 6e 57  |hell_AttachOpenW|
000034f0  69 6e 64 6f 77 48 61 6e  64 6c 65 72 29 0a 50 61  |indowHandler).Pa|
00003500  72 61 6d 73 20 3d 3e 20  0a 20 20 20 20 20 20 20  |rams => .       |
00003510  20 20 4e 6f 6e 65 20 0a  0a 20 20 20 20 20 20 20  |  None ..       |
00003520  3c 3d 0a 20 20 20 20 20  20 20 20 20 62 6f 6f 6c  |<=.         bool|
00003530  20 30 20 74 6f 20 64 69  73 61 6c 6c 6f 77 20 6f  | 0 to disallow o|
00003540  70 65 6e 2c 20 6e 6f 6e  20 30 20 74 6f 0a 20 20  |pen, non 0 to.  |
00003550  20 20 20 20 20 20 20 20  20 20 20 20 6f 70 65 6e  |            open|
00003560  0a 20 20 20 20 20 20 20  20 20 20 20 20 20 20 0a  |.              .|
00003570  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
000035a0  2d 2d 2d 2d 2d 2d 2d 2d  0a 0a 50 52 4f 43 73 68  |--------..PROCsh|
000035b0  65 6c 6c 5f 41 74 74 61  63 68 50 72 65 51 75 69  |ell_AttachPreQui|
000035c0  74 48 61 6e 64 6c 65 72  28 29 0a 50 61 72 61 6d  |tHandler().Param|
000035d0  73 20 3d 3e 0a 20 20 20  20 20 20 20 20 20 73 74  |s =>.         st|
000035e0  72 20 66 75 6e 63 74 69  6f 6e 20 6e 61 6d 65 0a  |r function name.|
000035f0  0a 52 65 67 69 73 74 65  72 73 20 61 20 66 75 6e  |.Registers a fun|
00003600  63 74 69 6f 6e 20 6e 61  6d 65 20 74 6f 20 62 65  |ction name to be|
00003610  20 63 61 6c 6c 65 64 20  77 68 65 6e 20 61 20 0a  | called when a .|
00003620  50 72 65 51 75 69 74 20  6d 65 73 73 61 67 65 20  |PreQuit message |
00003630  69 73 20 72 65 63 65 69  76 65 64 2e 20 54 68 69  |is received. Thi|
00003640  73 20 67 69 76 65 73 20  74 68 65 0a 61 70 70 6c  |s gives the.appl|
00003650  69 63 61 74 69 6f 6e 20  61 20 63 68 61 6e 63 65  |ication a chance|
00003660  20 74 6f 20 73 61 76 65  20 64 61 74 61 20 6f 72  | to save data or|
00003670  20 61 62 6f 72 74 0a 74  68 65 20 73 68 75 74 64  | abort.the shutd|
00003680  6f 77 6e 2e 0a 0a 54 68  69 73 20 6d 65 73 73 61  |own...This messa|
00003690  67 65 20 69 73 20 69 73  73 75 65 64 20 77 68 65  |ge is issued whe|
000036a0  6e 20 74 68 65 20 74 61  73 6b 20 69 73 20 71 75  |n the task is qu|
000036b0  69 74 0a 66 72 6f 6d 20  74 68 65 20 54 61 73 6b  |it.from the Task|
000036c0  20 4d 61 6e 61 67 65 72  2c 20 6f 72 20 77 68 65  | Manager, or whe|
000036d0  6e 20 43 54 52 4c 2d 53  48 49 46 54 2d 46 31 32  |n CTRL-SHIFT-F12|
000036e0  0a 69 73 20 70 72 65 73  73 65 64 20 28 75 6e 64  |.is pressed (und|
000036f0  65 72 20 52 49 53 43 20  4f 53 20 33 29 2e 0a 0a  |er RISC OS 3)...|
00003700  55 73 65 72 20 46 4e 20  28 50 52 4f 43 73 68 65  |User FN (PROCshe|
00003710  6c 6c 5f 41 74 74 61 63  68 50 72 65 51 75 69 74  |ll_AttachPreQuit|
00003720  48 61 6e 64 6c 65 72 29  0a 50 61 72 61 6d 73 20  |Handler).Params |
00003730  3d 3e 20 0a 20 20 20 20  20 20 20 20 20 4e 6f 6e  |=> .         Non|
00003740  65 20 0a 0a 20 20 20 20  20 20 20 3c 3d 0a 20 20  |e ..       <=.  |
00003750  20 20 20 20 20 20 20 62  6f 6f 6c 20 6e 6f 6e 20  |       bool non |
00003760  30 20 74 6f 20 61 6c 6c  6f 77 20 71 75 69 74 2c  |0 to allow quit,|
00003770  20 30 20 74 6f 0a 20 20  20 20 20 20 20 20 20 20  | 0 to.          |
00003780  20 20 20 20 63 61 6e 63  65 6c 20 71 75 69 74 0a  |    cancel quit.|
00003790  0a 54 68 69 73 20 66 75  6e 63 74 69 6f 6e 20 69  |.This function i|
000037a0  73 20 63 61 6c 6c 65 64  20 77 68 65 6e 20 61 20  |s called when a |
000037b0  50 72 65 51 75 69 74 0a  6d 65 73 73 61 67 65 20  |PreQuit.message |
000037c0  69 73 20 72 65 63 65 69  76 65 64 2e 0a 0a 2d 2d  |is received...--|
000037d0  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
00003800  2d 2d 2d 2d 2d 2d 0a                              |------.|
00003807