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PCA/Docs/Ui

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Plug In Compliant Application protocol
======================================



PCA User Interface specifications
=================================


Author : Rob Davison (rdavison@xtra.co.nz)
Date : 15/08/96
Status : Release 1

This documents the suggested user-interface and general message handling
requirements for applications on both sides of the PCA protocol. You should
note that it is possible for applications to implement either or both sides
of the protocol.


Local application
-----------------

The local application must poll the PCA system with Message_WhosAbout and
present that information to the user. It is recommended that you provide
several methods of doing this:


Invoking the protocol
---------------------

Invoking the protocol scans the active tasks and presents a list of the
available utilities. This list can be presented in two ways; as a simple
RISC OS menu or as a graphical 'pop-up' window. You should support both
methods in your applications by providing a preferences option to the user.
To invoke the popup Ctrl-Shift-Double Click is recommended. If that shortcut
is not free another combination is acceptable, preferably related in some
way to the Ctrl-Double click Acorn OLE-1 standard.

In addition, add the PCA to your menu structure. The sub-menu item
"Utilities >" is appropriate. Another alternative is to add a button to your
toolbar to invoke the protocol.
   
The width of this dialogue should be set to the width of the longest tool
name returned in the  Message_ImHere messages (which may be found on the
RiscPC using SWI Wimp_TextOp). Add 220 OS-units to the width of all items to
allow for the Tool icon and Info buttons. The height of each item is fixed
at 96 OS-units.

The tool icon is present in the Wimp sprite pool and is usually the PCA
applications icon. Applications which provide multiple 'tools' can register
more than once, passing a unique 'toolnumber' with Message_ImHere . 

The popup should be opened such that the pointer is centred over the top
tool name and as a menu so it automatically closes on any mouse access
outside it. If there are more than five PCAs available the popup dialogue
should be given a vertical scrollbar and the initial size limited to five
items. For a more detailed example, see the PCA version of Composition or
the dialogue creation and redraw code in !Spaint. 

Other options 

Several other options may be offered to the user by a Local task. Which are
practical depends on the application in question but the following may be
appropriate for a task which supports both sides of the protocol:

The display radio buttons allow the user to choose the form of popup which
will be presented to the user. Menus are simpler and take up less desktop
space. Dialogue boxes look better and provide more information.

The In-place editing option should be provided by a Remote task. If no
objects are being edited then toggling this option simply prevents or allows
bit 4 of the flags word to be set in subsequent  Message_ImHere messages
generated. If an object is being edited in-place when this option is toggled
the Remote task should switch between in-place and remote operation on that
object as the option is toggled.

The 'Follow selected' option is provided by a Local task and, when on, the
last task sent a  Message_DoYourStuff is automatically sent a new
Message_DoYourStuff every time the 'selected object' changes. Obviously this
option only has validity when there is a concept of the 'selected object'.
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00000020  6f 74 6f 63 6f 6c 0a 3d  3d 3d 3d 3d 3d 3d 3d 3d  |otocol.=========|
00000030  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |================|
00000040  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 0a 0a 0a  |=============...|
00000050  0a 50 43 41 20 55 73 65  72 20 49 6e 74 65 72 66  |.PCA User Interf|
00000060  61 63 65 20 73 70 65 63  69 66 69 63 61 74 69 6f  |ace specificatio|
00000070  6e 73 0a 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |ns.=============|
00000080  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |================|
00000090  3d 3d 3d 3d 0a 0a 0a 41  75 74 68 6f 72 20 3a 20  |====...Author : |
000000a0  52 6f 62 20 44 61 76 69  73 6f 6e 20 28 72 64 61  |Rob Davison (rda|
000000b0  76 69 73 6f 6e 40 78 74  72 61 2e 63 6f 2e 6e 7a  |vison@xtra.co.nz|
000000c0  29 0a 44 61 74 65 20 3a  20 31 35 2f 30 38 2f 39  |).Date : 15/08/9|
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000001e0  61 70 70 6c 69 63 61 74  69 6f 6e 0a 2d 2d 2d 2d  |application.----|
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000002d0  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 0a 0a  |--------------..|
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00000b50  69 6e 67 20 65 64 69 74  65 64 20 74 68 65 6e 20  |ing edited then |
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00000be0  64 2e 20 49 66 20 61 6e  20 6f 62 6a 65 63 74 20  |d. If an object |
00000bf0  69 73 20 62 65 69 6e 67  20 65 64 69 74 65 64 20  |is being edited |
00000c00  69 6e 2d 70 6c 61 63 65  20 77 68 65 6e 20 74 68  |in-place when th|
00000c10  69 73 20 6f 70 74 69 6f  6e 20 69 73 20 74 6f 67  |is option is tog|
00000c20  67 6c 65 64 0a 74 68 65  20 52 65 6d 6f 74 65 20  |gled.the Remote |
00000c30  74 61 73 6b 20 73 68 6f  75 6c 64 20 73 77 69 74  |task should swit|
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00000c50  61 63 65 20 61 6e 64 20  72 65 6d 6f 74 65 20 6f  |ace and remote o|
00000c60  70 65 72 61 74 69 6f 6e  20 6f 6e 20 74 68 61 74  |peration on that|
00000c70  0a 6f 62 6a 65 63 74 20  61 73 20 74 68 65 20 6f  |.object as the o|
00000c80  70 74 69 6f 6e 20 69 73  20 74 6f 67 67 6c 65 64  |ption is toggled|
00000c90  2e 0a 0a 54 68 65 20 27  46 6f 6c 6c 6f 77 20 73  |...The 'Follow s|
00000ca0  65 6c 65 63 74 65 64 27  20 6f 70 74 69 6f 6e 20  |elected' option |
00000cb0  69 73 20 70 72 6f 76 69  64 65 64 20 62 79 20 61  |is provided by a|
00000cc0  20 4c 6f 63 61 6c 20 74  61 73 6b 20 61 6e 64 2c  | Local task and,|
00000cd0  20 77 68 65 6e 20 6f 6e  2c 20 74 68 65 0a 6c 61  | when on, the.la|
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00000cf0  4d 65 73 73 61 67 65 5f  44 6f 59 6f 75 72 53 74  |Message_DoYourSt|
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00000d20  4d 65 73 73 61 67 65 5f  44 6f 59 6f 75 72 53 74  |Message_DoYourSt|
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00000d70  69 6f 6e 20 6f 6e 6c 79  20 68 61 73 20 76 61 6c  |ion only has val|
00000d80  69 64 69 74 79 20 77 68  65 6e 20 74 68 65 72 65  |idity when there|
00000d90  20 69 73 20 61 20 63 6f  6e 63 65 70 74 20 6f 66  | is a concept of|
00000da0  20 74 68 65 20 27 73 65  6c 65 63 74 65 64 20 6f  | the 'selected o|
00000db0  62 6a 65 63 74 27 2e                              |bject'.|
00000db7