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Joshua Bell 2017-09-24 16:16:36 -07:00
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desk.acc/a2d.md
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@ -12,20 +12,20 @@ There are three distinct API classes that need to be used:
#### Box
The _box_ block is reused in several places. It has the following structure
The _box_ block is reused in several places. It has the following structure:
```
.word left pixels from screen left edge
.word top pixels from screen top edge
.addr addr A2D_SCREEN_ADDR ($2000)
.word stride A2D_SCREEN_STRIDE ($80)
.word hoffset pixels scrolled left
.word voffset pixels scrolled up
.word width pixels wide
.word height pixels tall
.word left pixels from screen left edge
.word top pixels from screen top edge
.addr addr A2D_SCREEN_ADDR ($2000)
.word stride A2D_SCREEN_STRIDE ($80)
.word hoffset pixels scrolled left
.word voffset pixels scrolled up
.word width pixels wide
.word height pixels tall
```
Drawing state can be set to a box (A2D_SET_BOX) and then subsequent operations will occur
Drawing state can be set to a box (A2D_SET_BOX) and then subsequent operations will occur
within the box: they will be clipped to the bounds and the offset will be taken into account.
For example, if hoffset is 15 and voffset is 5 then a pixel plotted at 40, 40 will appear
at 40 - 15 = 25 pixels from the left edge and 40 - 5 = 35 pixels from the top edge.
@ -37,7 +37,7 @@ A simple repeating 8x8 _pattern_ is defined by 8 bytes. All bits of each byte ar
#### Window Parts
Windows have a _client area_ which has the requested dimensions. Above this is an optional
_title bar_ which in turn has an optional _close box_. Within the client area are an
_title bar_ which in turn has an optional _close box_. Within the client area are an
optional _resize box_ and optional _scroll bars_.
@ -51,7 +51,7 @@ optional _resize box_ and optional _scroll bars_.
* Create window (A2D_CREATE_WINDOW)
* Draw everything
* Call $2B (no idea what this does!)
* Enter input loop (see below)
* Enter [input loop](#input-loop)
* ...
* Destroy window (A2D_DESTROY_WINDOW)
* Redraw desktop icons (DESKTOP_REDRAW_ICONS)
@ -61,10 +61,10 @@ optional _resize box_ and optional _scroll bars_.
* 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
> client area is entirely offscreen then various operations should be skipped because
> the window's box coordinates will not be set correctly.
#### Input Loop
#### Input Loop {#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.
@ -72,14 +72,14 @@ optional _resize box_ and optional _scroll bars_.
* 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 title bar (A2D_ELEM_TITLE) then initiate [window drag](#drag).
* If resize box (A2D_ELEM_RESIZE) then initiate [window resize](#resize).
* 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).
* If part is a scrollbar (A2D_VSCROLL or A2D_HSCROLL) then initiate a [scroll](#scroll).
* Handle a client click using custom logic.
#### Window Drag
#### Window Drag {#drag}
* Call A2D_DRAG_WINDOW.
* Call JUMP_TABLE_REDRAW_ALL.
@ -88,7 +88,7 @@ optional _resize box_ and optional _scroll bars_.
* If _offscreen flag_ is not set, redraw window.
#### Window Resize
#### Window Resize {#resize}
* Call A2D_DRAG_RESIZE.
* Call JUMP_TABLE_REDRAW_ALL.
@ -96,7 +96,7 @@ optional _resize box_ and optional _scroll bars_.
* Call A2D_RESIZE_WINDOW if needed to adjust scroll bar settings. (Details TBD).
* Redraw window.
#### Window Scroll
#### Window Scroll {#scroll}
### Drawing Operations
@ -140,7 +140,7 @@ Call from AUX (RAMRDON/RAMWRTON). Call style:
jsr $8E00
.byte command
.addr params
```
```
> NOTE: Only a single call has been identified so far.