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222 lines
5.0 KiB
Markdown
222 lines
5.0 KiB
Markdown
# DeskTop APIs
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There are three distinct API classes that need to be used:
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* MouseGraphics ToolKit - graphics primitives, windowing and events
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* DeskTop Jump Table - simple JSR calls starting at $4003 MAIN, no arguments
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* DeskTop API - another MLI-style interface starting at $8E00 AUX
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In addition, some DeskTop data structures can be accessed directly.
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<!-- ============================================================ -->
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## MouseGraphics ToolKit
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This is a complex API library written by Apple circa 1985. It consists of:
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* Graphics Primitives - screen management, lines, rects, polys, text, patterns, pens
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* Mouse Graphics - windows, menus, events, cursors
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Entry point is fixed at $4000 AUX, called MLI-style (JSR followed by command type and address of param block).
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See [MGTK.md](MGTK.md) for further documentation.
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<!-- ============================================================ -->
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## DeskTop Jump Table
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Call from MAIN (RAMRDOFF/RAMWRTOFF); AUX language card RAM must be banked in. Call style:
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```
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jsr $xxxx
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```
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Some calls take parameters in registers.
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> NOTE: Not all of the calls have been identified.
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> Routines marked with * are used by Desk Accessories.
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#### `JUMP_TABLE_MAIN_LOOP` ($4000)
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Enter DeskTop main loop
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#### `JUMP_TABLE_MGTK_RELAY` ($4003)
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MGTK relay call (main>aux)
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#### `JUMP_TABLE_SIZE_STRING` ($4006)
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Compose "nnn Blocks" string into internal buffer
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#### `JUMP_TABLE_DATE_STRING` ($4009)
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Compose date string into internal buffer
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#### `JUMP_TABLE_0C` ($400C)
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???
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#### `JUMP_TABLE_0F` ($400F)
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Auxload
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#### `JUMP_TABLE_EJECT` ($4012)
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Eject command
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#### `JUMP_TABLE_REDRAW_ALL` ($4015) *
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Redraws all DeskTop windows. Required after a drag or resize.
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Follow with `DT_REDRAW_ICONS` call.
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#### `JUMP_TABLE_DESKTOP_RELAY` ($4018)
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DESKTOP relay call (main>aux)
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#### `JUMP_TABLE_LOAD_OVL` ($401B)
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Load overlay routine
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#### `JUMP_TABLE_CLEAR_SEL` ($401E) *
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Deselect all DeskTop icons (volumes/files).
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#### `JUMP_TABLE_MLI` ($4021)
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ProDOS MLI call (Y=call, X,A=params addr) *
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#### `JUMP_TABLE_COPY_TO_BUF` ($4024)
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Copy to buffer
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#### `JUMP_TABLE_COPY_FROM_BUF:=` ($4027)
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Copy from buffer
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#### `JUMP_TABLE_NOOP` ($402A)
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No-Op command (RTS)
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#### `JUMP_TABLE_2D` ($402D)
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??? (Draw type/size/date in non-icon views?)
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#### `JUMP_TABLE_ALERT_0` ($4030)
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Show alert 0
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#### `JUMP_TABLE_ALERT_X` ($4033)
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Show alert X
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#### `JUMP_TABLE_LAUNCH_FILE` ($4036)
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Launch file
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#### `JUMP_TABLE_CUR_POINTER` ($4039) *
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Changes mouse cursor to pointer.
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#### `JUMP_TABLE_CUR_WATCH` ($403C)
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Changes mouse cursor to watch.
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#### `JUMP_TABLE_RESTORE_OVL` ($403F)
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Restore from overlay routine
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<!-- ============================================================ -->
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## DeskTop API
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Call from AUX (RAMRDON/RAMWRTON). Call style:
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```
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jsr $8E00
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.byte command
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.addr params
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```
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> NOTE: Only some of the calls have been identified.
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Commands:
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### `DT_ADD_ICON` ($01)
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Parameters: { addr icondata }
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### `DT_HIGHLIGHT_ICON` ($02)
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Parameters: { byte icon }
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### `DT_UNHIGHLIGHT_ICON` ($03)
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Parameters: { byte icon }
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### `DT_CLOSE_WINDOW` ($07)
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Parameters: { byte window_id }
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### `DT_FIND_ICON` ($09)
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Parameters: { word mousex, word mousey, (out) byte result }
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### `DT_REDRAW_ICONS` ($0C)
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Parameters: none (pass $0000 as address)
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Redraws the icons on the desktop (mounted volumes, trash). This call
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is required after destroying, moving, or resizing a window.
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### `DT_ICON_IN_RECT` ($0D)
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Parameters: { byte icon, rect bounds }
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<!-- ============================================================ -->
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## DeskTop Data Structures
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DeskTop's state - selection, windows, icons - is only partially accessible
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via APIs. Operations such as opening the selected file requires accessing
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internal data structures directly.
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### Selection
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* `path_index` (byte) - id of active window in `path_table`
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* `selected_file_count` (byte) - number of selected icons
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* `selected_file_list` (array of bytes) - ids of selected icons
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### Window - representing an open directory
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* `path_table` (array of addrs) - maps window id to window record address
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Window record: 65-byte pathname buffer; it is a length-prefixed
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absolute path (e.g. `/HD/GAMES`)
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### Icon - representing a file (in a window) or volume (on the desktop)
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* `file_table` (array of addrs) - maps icon id to icon record address
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Icon record: 27-byte structure optimized for rendering the file/volume icon.
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```
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.byte icon icon index
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.byte ??
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.byte type/window_id
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(bits 0-3 window_id)
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(bits 4,5,6)
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000 = directory
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001 = system
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010 = binary
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011 = basic
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100 = (unused)
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101 = text/generic
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110 = (unused)
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111 = trash
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(bit 7 = open flag)
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.word iconx (pixels)
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.word icony (pixels)
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.addr iconbits (addr of {mapbits, mapwidth, reserved, maprect})
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.byte len (name length + 2)
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.res 17 name (name, with a space before and after)
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```
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