117 lines
4.4 KiB
Forth
117 lines
4.4 KiB
Forth
# The environment is a thin layer in this app, just a history of 'tabs' that
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# are fully specified by the operations used to generate them.
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type environment {
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}
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# static buffer sizes in this file:
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# main-panel-hor # in characters
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# item-padding-hor # in pixels
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# item-padding-ver # in characters
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# avatar-side # in pixels
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# avatar-space-hor # in characters
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# search-space-ver # in characters
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# author-name-padding-ver # in characters
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# post-right-coord # in characters
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# channel-offset-x # in characters
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fn render-environment screen: (addr screen), env: (addr environment), users: (addr array user), channels: (addr array channel), items: (addr array item) {
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clear-screen screen
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render-search-input screen, env
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render-item-list screen, env, items, users
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}
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fn render-item-list screen: (addr screen), env: (addr environment), _items: (addr array item), users: (addr array user) {
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var tmp-width/eax: int <- copy 0
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var tmp-height/ecx: int <- copy 0
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tmp-width, tmp-height <- screen-size screen
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var screen-height: int
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copy-to screen-height, tmp-height
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#
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var y/ecx: int <- copy 2/search-space-ver
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y <- add 1/item-padding-ver
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var items/esi: (addr array item) <- copy _items
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var i/ebx: int <- copy 0
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var max/edx: int <- length items
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{
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compare i, max
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break-if->=
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compare y, screen-height
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break-if->=
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var offset/eax: (offset item) <- compute-offset items, i
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var curr-item/eax: (addr item) <- index items, offset
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y <- render-item screen, curr-item, users, y, screen-height
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i <- increment
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loop
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}
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}
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fn render-search-input screen: (addr screen), env: (addr environment) {
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set-cursor-position 0/screen, 2/x 1/y
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draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, "search ", 7/fg 0/bg
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draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, "________________________________", 0xf/fg 0/bg
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}
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fn render-item screen: (addr screen), _item: (addr item), _users: (addr array user), y: int, screen-height: int -> _/ecx: int {
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var item/esi: (addr item) <- copy _item
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var users/edi: (addr array user) <- copy _users
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var author-index-addr/ecx: (addr int) <- get item, by
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var author-index/ecx: int <- copy *author-index-addr
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var author-offset/ecx: (offset user) <- compute-offset users, author-index
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var author/ecx: (addr user) <- index users, author-offset
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# author avatar
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var author-avatar-ah/eax: (addr handle image) <- get author, avatar
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var _author-avatar/eax: (addr image) <- lookup *author-avatar-ah
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var author-avatar/ebx: (addr image) <- copy _author-avatar
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{
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compare author-avatar, 0
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break-if-=
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var y/edx: int <- copy y
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y <- shift-left 4/log2font-height
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var x/eax: int <- copy 0x20/main-panel-hor
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x <- shift-left 3/log2font-width
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x <- add 0x18/item-padding-hor
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render-image screen, author-avatar, x, y, 0x50/avatar-side, 0x50/avatar-side
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}
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# channel
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var channel-name-ah/eax: (addr handle array byte) <- get item, channel
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var channel-name/eax: (addr array byte) <- lookup *channel-name-ah
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{
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var x/eax: int <- copy 0x20/main-panel-hor
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x <- add 0x40/channel-offset-x
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set-cursor-position screen, x y
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}
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draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, "#", 7/grey 0/black
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draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, channel-name, 7/grey 0/black
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# author name
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var author-real-name-ah/eax: (addr handle array byte) <- get author, real-name
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var author-real-name/eax: (addr array byte) <- lookup *author-real-name-ah
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{
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var x/ecx: int <- copy 0x20/main-panel-hor
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x <- add 0x10/avatar-space-hor
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set-cursor-position screen, x y
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draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, author-real-name, 0xf/white 0/black
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}
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increment y
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# text
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var text-ah/eax: (addr handle array byte) <- get item, text
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var _text/eax: (addr array byte) <- lookup *text-ah
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var text/edx: (addr array byte) <- copy _text
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var x/eax: int <- copy 0x20/main-panel-hor
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x <- add 0x10/avatar-space-hor
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var text-y/ecx: int <- copy y
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text-y <- add 1/author-name-padding-ver
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x, text-y <- draw-text-wrapping-right-then-down screen, text, x text-y, 0x70/xmax=post-right-coord screen-height, x text-y, 7/fg 0/bg
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# flush
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add-to y, 6
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compare y, text-y
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{
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break-if-<
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return y
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}
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return text-y
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}
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fn update-environment env: (addr environment), key: byte {
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}
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