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Joshua Bell 2017-09-22 09:33:49 -07:00 committed by GitHub
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@ -43,13 +43,63 @@ optional _resize box_ and optional _scroll bars_.
### Desk Accessory Lifecycle
* Loaded/invoked at $800 MAIN (have through $1FFF available)
* Save stack
* Copy DA code from MAIN to AUX
* Copy DA code from MAIN to AUX (e.g. using AUXMOVE)
* Transfer control to AUX
* Turn on ALTZP and LCBANK1
* Create window (A2D_CREATE_WINDOW)
* Draw everything
* Call $2B (no idea what this does!)
* Enter input loop (see below)
* ...
* Destroy window (A2D_DESTROY_WINDOW)
* Redraw desktop icons (DESKTOP_REDRAW_ICONS)
* Switch control back to MAIN (RAMRDOFF/RAMWRTOFF)
* Ensure ALTZP and LCBANK1 are on
* Restore stack
* RTS
> NOTE: Movable windows must maintain an _offscreen_flag_. If a window is moved so that the
> client area is entirely offscreen then various operations should be skiped because
> the window's box coordinates will not be set correctly.
#### Input Loop
* Call A2D_GET_INPUT.
* If a key (A2D_INPUT_KEY), then check modifiers (Open/Closed Apple) and key code, ignore or take action.
* If a click, call A2D_QUERY_TARGET.
* Check target window id. If not a match, ignore.
* Check target element.
* If close box (A2D_ELEM_CLOSE) then call A2D_CLOSE_CLICK; if not aborted, exit the DA, otherwise ignore.
* If title bar (A2D_ELEM_TITLE) then initiate window drag (see below).
* If resize box (A2D_ELEM_RESIZE) then initiate window resize (see below).
* If not client area (A2D_ELEM_CLIENT) then it's either the desktop or menu; ignore.
* Call A2D_QUERY_CLIENT.
* If part is a scrollbar (A2D_VSCROLL or A2D_HSCROLL) then initiate a scroll (see below).
* Handle a client click using custom logic.
#### Window Drag
* Call A2D_DRAG_WINDOW.
* Call JUMP_TABLE_REDRAW_ALL.
* If _offscreen flag_ was not set, redraw desktop icons (DESKTOP_REDRAW_ICONS).
* Set _offscreen flag_ if window's `top` is greater than or equal to the screen bottom (191), clear otherwise.
* If _offscreen flag_ is not set, redraw window.
#### Window Resize
### Event Loop
* Call A2D_DRAG_RESIZE.
* Call JUMP_TABLE_REDRAW_ALL.
* Call DESKTOP_REDRAW_ICONS.
* Call A2D_RESIZE_WINDOW if needed to adjust scroll bar settings. (Details TBD).
* Redraw window.
#### Window Scroll
### Drawing Operations