2018-02-19 19:33:13 +00:00
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# DeskTop APIs
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There are three distinct API classes that need to be used:
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* Mouse Graphics Tool Kit - 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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## Mouse Graphics Tool Kit
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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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## DeskTop Jump Table
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Call from MAIN (RAMRDOFF/RAMWRTOFF). Call style:
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```
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jsr $xxxx
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```
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> NOTE: Most of these calls have not been identified yet.
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#### JUMP_TABLE_REDRAW_ALL ($4015)
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Redraws all DeskTop windows. Required after a drag or resize. Follow with DESKTOP_REDRAW_ICONS call.
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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_CUR_POINTER ($4039)
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Changes mouse cursor to the default pointer. Note that bitmap is in the language card memory so it must be swapped in.
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#### JUMP_TABLE_CUR_WATCH ($403C)
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Changes mouse cursor to a watch. Note that bitmap is in the language card memory so it must be swapped in.
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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 a single call has been identified so far.
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Commands:
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#### DESKTOP_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 is required in these cases:
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* After destroying a window (CloseWindow)
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* After repainting the desktop (JUMP_TABLE_REDRAW_ALL) following a drag (DragWindow)
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* After repainting the desktop (JUMP_TABLE_REDRAW_ALL) following a resize (GrowWindow)
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## DeskTop Data Structures
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DeskTop's state - windows, icons - is accessible indirectly via APIs,
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and data structures can be accessed 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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2018-02-20 03:21:10 +00:00
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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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2018-02-19 19:33:13 +00:00
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```
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