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Utils/!FileTree/FntMenuDoc
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Duplicates
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- Archimedes archive » Micro User » MU 1992-04.adf » PD » !FileTree/FntMenuDoc
- Archimedes archive » Micro User » MU 1992-08.adf » PD » Utils/!FileTree/FntMenuDoc
File contents
Documentation for the FontMenu module v.1.06
� J.R�ling 1990
Introduction
As more and more outlined fonts for the Archimedes are becoming available,
a problem arrises for applications accessing these fonts. The number of
fonts is not known in advance, so to create a font menu the application has
to figure out the number of fonts, claim enough space to hold a font menu,
and create it. This can be done in the dull single level (straight foreward)
way. This saves some space, and code complexety, but it is not prefered, as
the user will be presented by a sometimes very long menu containing items
with the same prefix, e.g.
Trinity
Trinity.Bold
Trinity.Bold.Italic
Trinity.Medium
Trinity.Medium.Italic
etc.
The more fonts become available, the longer this menu becomes, the more
irritating it is.
Many applications now are even uncapable of creating menus longer then a
certain amount. Examples of these are !Edit (48 entries), !Draw (64
entries), and even !Impression reacts sick.
When running more then one application with a font menu, there is arises
another disadvantage of this method. Several applications using a identical
menu structure but not sharing the resource, is not the policy of Acorn on
other subjects.
So here is a neat solution for everyone who wants a proper font menu,
without the hassel to create one, and without claiming extra space.
What does FontMenu do ?
The FontMenu module is able of creating a multi-level font menu, and lets
every application share the joy. It contains several SWI's to create, and
access this resource. If no application is using the structure anymore
(because they were all quited for example) the memory for the menu structure
will be realesed by FontMenu, so no unnecessary memory is in use. It has no
problems if more than one font directory is in use. The menu is sorted
alphabeticly (even when more than one font directoris are used), so the user
is able to find the required font at an instance. It requires a minimum of
disc access when a new menu is created. New menus are only created if one is
required, and there isn't already a valid one. When a font menu exsists, and
the user has selected a new font directory, the font menu will be rebuild as
soon as the application accesses this font menu.
FontMenu creates an multi-leveled font menu. In the example above this is a
menu where 'Trinity' occurs only once, but it will have a submenu containing
two items: 'Bold' and 'Medium'. Because there are two types of
'Trinity.Bold' ('Trinity.Bold' and 'Triniy.Bold.Italic') 'Bold' will have
another submenu. In this submenu the first item will be 'Plain'. This name
is made up, but it is more clear then a empty meny entry. The second entry
will of course be 'Italic'.
How does FontMenu work ?
To use FontMenu it is necessary to understand how the Wimp works, and how
to create a application on the Archimedes environment. It is assumed that
the reader understands the above for the rest of this document.
When a application wants to access the FontMenu menu structure, it has to
call SWI "FontMenu_Create" before any other FontMenu SWI's are called. This
will assure that a proper font menu structure will be available. This can be
done on initialisation of the application, but is not absolutly necessary.
When exiting the application, SWI "FontMenu_Release" has to be called, so if
this was the only application using the font menu, FontMenu can release the
memory for it. Every time SWI "FontMenu_Create" is called, a counter is
incremented, and if it was zero (this is the initial value), it will create
a new font menu. When calling SWI "FontMenu_Release", the counter is
decremented, and if it reached zero FontMenu will release the menu memory,
as no application is using the menu structure anymore.
From here on there are two ways of programming when using FontMenu. The
first is the simple one, the second a little bit more complicated, as it
involves the use the Wimp message system.
The easy way
------------
Whenever the user opens the menu structure of the application by pressing
the MENU button, a call has to be made to FontMenu_Select with R0 pointing
to a point sepearted (zero terminated) font string, and in R1 the value 0 or
1 to tell FontMenu if it allows the user to select the SystemFont. The call
will return with a pointer to the font menu structure in R1. Now it is up to
the programmer what to do with this pointer. When passed in R1 when calling
Wimp_CreateMenu, the menu tree will consist entirely of FontMenu structures.
If the font menu should be a submenu of the applications own menu structure,
the pointer should be put in the submenu-word of the parent menu entry, and
Wimp_CreateMenu should be called with a pointer to the applications own menu
structure.
When a menu selection was done, the application should determine by the
returned 'menu tree so far' values if the user selected a entry in the font
menu. If so, it should set an internal flag (say 'FontMenuSelected') to
TRUE, else it should set it to FALSE, so later on it is still known if the
user may have selected a new font. After that it should call SWI
"FontMenu_DecodeFontMenu" with R0 pointing to the first menu selection in
the 'menu tree so far' block wich determines the selected font. R1 should
point to a buffer to contain the answer. This buffer must be at least 48
bytes. If on return of this call R0 > 0, the user selected a new font. The
buffer passed in R1 will contain the font name (a point seperated, zero
terminated font string).
After a menu selction, and taking appropriate actions, the application
should check the mouse button state to see if it has to call SWI
"Wimp_CreateMenu" again. If adjust was used to make the selection, it has to
check the 'FontMenuSelected' flag to determine if the user selected a font
menu entry. If so, it should call FontMenu_Select as discribed above. This
should be done with R0 pointing to the string FontMenu_DecodeFontMenu
returned. The menu pointer returned by FontMenu_Select has to be put in the
'sub-menu pointer' word of the 'Fonts' entry. Now the call to
Wimp_CreateMenu can be done. In this way it is possible for the user to
click with adjust in the font menu, and keeping the menu on screen after the
selection.
There is one little drawback of this method. If the user selected a new
!Fonts directory, it will be noted be the FontMenu_Select code, and a new
font menu structure will be generated. This is always the case, also with
the method discribed below. But it could be possible that the user was going
to do something else in the menu, not selecting a font at all. He could for
instance want to quit. Now he (she) has to wait for the FontMenu module to
create the new menu structure, before he (she) is able to access the 'Quit'
entry. So the next solution is to wait with calling FontMenu_Select, until
the user wants to select a new font. This can only be done by making use of
the Wimp message system. The difficult thing of this method (as discribed
later) is that the Wimp is unable to re-open the menu structure entirely
after a menu selection using the ADJUST button. So a little trick has to
solve this problem.
The hard way
------------
In the applications own menu structure, there should be a menu entry (e.g.
'Fonts') with bit 3 if its menu flags set. The application has to assure
that this bit is set whenever it calls SWI "Wimp_CreateMenu" as it may be
corrupted (see below). So whenever the user puts the pointer above the arrow
on the right of this entry, a warning message (&400C0) will be send by the
Wimp. On receiving of this message, the application should respond by calling
SWI "FontMenu_Select" with R0 pointing to a point sepearted (zero
terminated) font string, and in R1 the value 0 or 1 to tell FontMenu if it
allows the user to select the SystemFont. The font string may be a zero
length string, wich means that no current font is selected. FontMenu will
select the font in its menu structure. If 1 was passed in R1, the first item
in the menu structure will be 'SystemFonts'. In case R1 = 0, this entry will
not be there. This call will return with a pointer to the menu structure in
R1. This pointer should be passed to SWI "Wimp_CreateSubMenu".
When a menu selection was done, the application should determine by the
returned 'menu tree so far' values if the user selected a entry in the font
menu. If so, it should set an internal flag (say 'FontMenuSelected') to
TRUE, else it should set it to FALSE, so later on it is still known if the
user may have selected a new font. After that it should call SWI
"FontMenu_DecodeFontMenu" with R0 pointing to the first menu selection in
the 'menu tree so far' block wich determines the selected font. R1 should
point to a buffer to contain the answer. This buffer must be at least 48
bytes. If on return of this call R0 > 0, the user selected a new font. The
buffer passed in R1 will contain the font name (a point seperated, zero
terminated font string).
After a menu selction, and taking appropriate actions, the application
should check the mouse button state to see if it has to call SWI
"Wimp_CreateMenu" again. If adjust was used to make the selection, it has to
check the 'FontMenuSelected' flag to determine if the user selected a font
menu entry. If so, it should call SWI "FontMenu_Select" as discribed above.
This should be done with R0 pointing to the string SWI
"FontMenu_DecodeFontMenu" returned. As the MenuWarningFlag in the menu
flags of the menu entry (e.g. 'Fonts') preceding the font menu was set
(phhh!), the Wimp is unable to recreating the whole menu tree automaticly.
So a litle trick has to assure that it will work correct. The menu pointer
returned by SWI "FontMenu_Select" has to be put in the 'sub-menu pointer'
word of the 'Fonts' entry, and the MenuWarningFlag (bit 3) of the menu flags
word of this entry should be cleared. Now the call to SWI "Wimp_CreateMenu"
can be done. In this way it is possible for the user to click with adjust in
the font menu, and keeping the menu on screen after the selection. The next
time the user opens the application menu, the MenuWarningFlag (bit 3) should
be set again, as other applications may have used the font menu in the
meanwhile, and it is necessary that SWI "FontMenu_Select" is called just
before the font menu opens.
Because it is possible that SWI "FontMenu_Create" takes some time to create
a new menu, it is recomended that there is a SWI "Hourglass_On" before, and
a SWI "Hourglass_Off" after this call. In case of a SWI "FontMenu_Select",
when Font$Path has changed (so a new font menu has to be created), this call
may take some time aswell, so the two Hourglass SWI's should be used here as
well.
Notes from the author
The reason why I wrote this module, is because I'm not only a programmer,
but also a user who likes to work with the Archimedes. This is because it's
a fast machine and because most parts of Risc-OS allow applications to be
very intuitive. I didn't like the way the available fonts were presented in
most applications, so I started to figure out a proper solution: FontMenu.
I hope that future applications adopt to this method, so please pass it on.
Everybody is free to use it, even in commercial code. The only restriction
is that this document should not be seperated from the FontMenu module, and
that both the module and this document remain unchanged. In case of
commercial use I would like to know this in advance (I could than provide
you with its latest release). My address is at the end of this document. You
can always contact me if you found some bug, or when having other
suggestions.
FontMenu SWI's
Below are the short discriptions of the FontMenu SWI's.
FontMenu_Create &8D080
----------------------
On entry: --
On exit : R0 = Number of fonts found
This will create a font menu structure in RMA, if not already done so. An
error occurs if there is not enough room in RMA to create the menu.
FontMenu_Release &8D081
-----------------------
On entry: --
On exit : --
This will release the memory taken by the font menu if no tasks are using
it anymore.
FontMenu_Select &8D082
----------------------
On entry: R0 = pointer to point seperated, ctrl terminated font string
R1 = SystemFont flag
On exit : R0 = State flag
R1 = pointer to font menu structure
This will tick the font passed in R0 on entry. R1 determines if
'SystemFont' should occur in the menu as follows:
Value Meaning
0 'SystemFont' does not occur in the menu
1 'SystemFont' does occur in the menu
On exit R0 shows the selection state as follows:
Value Meaning
0 To be selected font not found, no ticks
1 To be selected font found, and ticked
2 No font entries found, menu consists one item; 'SystemFont',
and is ticked
R1 will point to the font menu on exit. An error occurs if no font menu exists.
FontMenu_Deselect &8D083
------------------------
On entry: ---
On exit : --
This will clear all ticks and marks of the font menu. It is not necessary
to call this SWI before a FontMenu_Select call, as FontMenu_Select will take
care of cleaning up old selection. An error occurs if no font menu exists.
FontMenu_DecodeFontMenu &8D084
------------------------------
On entry: R0 = pointer to a list of font menu selections
R1 = pointer to a buffer to contain the answer
(at least 48 bytes long)
On exit : --
This will decode the font menu selection into a font string for the
FontManager. This string can be passed back to FontMenu_Select to tick the
appropriate entries. An error occurs if no font menu exists. This call makes
use of Wimp_DecodeMenu, but as it is possible that the returned string ends
with 'Plain' (a made up name to distinguise an empty sub-name from the rest
of the sub-names), it has to check for this, and throw away this last
sub-name so the FontManager can recognise the required font.
FontMenu_Smash &8D085
---------------------
On entry: --
On exit : --
This will release the font menu memory without looking at the amount of
times FontMenu_Create was called.
FontMenu_ReCreate &8D086
------------------------
On entry: --
On exit : R0 = Number of fonts found
This will release a existing font menu, and recreate it.
===========================================================
To contact the author of FontMenu, please write to:
Joris R�ling
Verlengde Willemstraat 8a
9725 AW Groningen
The Netherlands
Telephone: 050-271895
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00000060 52 d6 6c 69 6e 67 20 31 39 39 30 0a 0a 0a 0a 20 |R.ling 1990.... |
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00000660 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
*
00000690 20 0a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | . |
000006a0 20 20 20 20 20 20 20 20 20 20 20 20 0a 0a 20 20 | .. |
000006b0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
000006c0 20 20 20 20 20 20 20 20 57 68 61 74 20 64 6f 65 | What doe|
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00000830 6e 65 63 65 73 73 61 72 79 20 6d 65 6d 6f 72 79 |necessary memory|
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000038a0 2c 20 69 74 20 68 61 73 20 74 6f 20 63 68 65 63 |, it has to chec|
000038b0 6b 20 66 6f 72 20 74 68 69 73 2c 20 61 6e 64 20 |k for this, and |
000038c0 74 68 72 6f 77 20 61 77 61 79 20 74 68 69 73 20 |throw away this |
000038d0 6c 61 73 74 0a 73 75 62 2d 6e 61 6d 65 20 73 6f |last.sub-name so|
000038e0 20 74 68 65 20 46 6f 6e 74 4d 61 6e 61 67 65 72 | the FontManager|
000038f0 20 63 61 6e 20 72 65 63 6f 67 6e 69 73 65 20 74 | can recognise t|
00003900 68 65 20 72 65 71 75 69 72 65 64 20 66 6f 6e 74 |he required font|
00003910 2e 0a 0a 0a 0a 46 6f 6e 74 4d 65 6e 75 5f 53 6d |.....FontMenu_Sm|
00003920 61 73 68 20 26 38 44 30 38 35 0a 2d 2d 2d 2d 2d |ash &8D085.-----|
00003930 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
00003940 0a 4f 6e 20 65 6e 74 72 79 3a 20 2d 2d 0a 4f 6e |.On entry: --.On|
00003950 20 65 78 69 74 20 3a 20 2d 2d 0a 0a 20 54 68 69 | exit : --.. Thi|
00003960 73 20 77 69 6c 6c 20 72 65 6c 65 61 73 65 20 74 |s will release t|
00003970 68 65 20 66 6f 6e 74 20 6d 65 6e 75 20 6d 65 6d |he font menu mem|
00003980 6f 72 79 20 77 69 74 68 6f 75 74 20 6c 6f 6f 6b |ory without look|
00003990 69 6e 67 20 61 74 20 74 68 65 20 61 6d 6f 75 6e |ing at the amoun|
000039a0 74 20 6f 66 0a 74 69 6d 65 73 20 46 6f 6e 74 4d |t of.times FontM|
000039b0 65 6e 75 5f 43 72 65 61 74 65 20 77 61 73 20 63 |enu_Create was c|
000039c0 61 6c 6c 65 64 2e 0a 0a 0a 0a 46 6f 6e 74 4d 65 |alled.....FontMe|
000039d0 6e 75 5f 52 65 43 72 65 61 74 65 20 26 38 44 30 |nu_ReCreate &8D0|
000039e0 38 36 0a 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |86.-------------|
000039f0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0a 4f 6e 20 65 |-----------.On e|
00003a00 6e 74 72 79 3a 20 2d 2d 0a 4f 6e 20 65 78 69 74 |ntry: --.On exit|
00003a10 20 3a 20 52 30 20 3d 20 4e 75 6d 62 65 72 20 6f | : R0 = Number o|
00003a20 66 20 66 6f 6e 74 73 20 66 6f 75 6e 64 0a 0a 20 |f fonts found.. |
00003a30 54 68 69 73 20 77 69 6c 6c 20 72 65 6c 65 61 73 |This will releas|
00003a40 65 20 61 20 65 78 69 73 74 69 6e 67 20 66 6f 6e |e a existing fon|
00003a50 74 20 6d 65 6e 75 2c 20 61 6e 64 20 72 65 63 72 |t menu, and recr|
00003a60 65 61 74 65 20 69 74 2e 0a 0a 0a 0a 20 20 20 20 |eate it..... |
00003a70 20 20 20 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d | =============|
00003a80 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d |================|
*
00003aa0 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 3d 0a 0a |==============..|
00003ab0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00003ac0 54 6f 20 63 6f 6e 74 61 63 74 20 74 68 65 20 61 |To contact the a|
00003ad0 75 74 68 6f 72 20 6f 66 20 46 6f 6e 74 4d 65 6e |uthor of FontMen|
00003ae0 75 2c 20 70 6c 65 61 73 65 20 77 72 69 74 65 20 |u, please write |
00003af0 74 6f 3a 0a 0a 20 20 20 20 20 20 20 20 20 20 20 |to:.. |
00003b00 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
*
00003b20 4a 6f 72 69 73 20 52 d6 6c 69 6e 67 0a 20 20 20 |Joris R.ling. |
00003b30 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
*
00003b50 20 20 20 20 20 20 20 20 56 65 72 6c 65 6e 67 64 | Verlengd|
00003b60 65 20 57 69 6c 6c 65 6d 73 74 72 61 61 74 20 38 |e Willemstraat 8|
00003b70 61 0a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |a. |
00003b80 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00003b90 20 20 20 20 20 20 20 20 20 20 20 20 20 39 37 32 | 972|
00003ba0 35 20 41 57 20 47 72 6f 6e 69 6e 67 65 6e 0a 20 |5 AW Groningen. |
00003bb0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
*
00003bd0 20 20 20 20 20 20 20 20 20 20 54 68 65 20 4e 65 | The Ne|
00003be0 74 68 65 72 6c 61 6e 64 73 0a 0a 20 20 20 20 20 |therlands.. |
00003bf0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00003c00 20 20 20 20 20 20 20 20 20 20 20 54 65 6c 65 70 | Telep|
00003c10 68 6f 6e 65 3a 20 30 35 30 2d 32 37 31 38 39 35 |hone: 050-271895|
00003c20 0a 0a |..|
00003c22 
.