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have functionality for cursor to scroll down a line when cursor moves down one line working, but it only seems to work perfectly when there are no visual line breaks

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This commit is contained in:
Humza Shahid
2024-10-28 21:56:07 +00:00
parent 0ed5a23ade
commit bff4c006ed
5 changed files with 75 additions and 304 deletions
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332
fcore/text-builder.sml
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@@ -65,217 +65,10 @@ struct
* Todo:
* - Possibly add visual horizontal indentation when char-wrap occurs
* on an indented line *)
fun buildTextStringAfterCursor
( pos, str, acc, posX, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
) =
if pos < String.size str then
case String.sub (str, pos) of
#" " =>
(* if space, then proceed forward one char
* without adding to acc *)
buildTextStringAfterCursor
( pos + 1, str, acc, posX + xSpace, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
)
| #"\t" =>
(* if tab, proceed forward one char,
* and jump visually forwards three chars *)
buildTextStringAfterCursor
( pos + 1, str, acc, posX + xSpace3, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
)
| #"\n" =>
(* if \n, move down vertically, and move to start horizontally
* assuming we have not exceeded the window's height.
* If we have exceeded the window's height, just return acc. *)
if posY + ySpace < windowHeight then
buildTextStringAfterCursor
( pos + 1, str, acc, startX, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
)
else
(* return if there is no more vertical space after line break *)
accToDrawMsg (acc, cursorAcc)
| #"\r" =>
(* same as \n, except we also check if we are in a \r\n pair,
* and proceed two characters forward if so *)
if posY + ySpace < windowHeight then
if
pos < String.size str - 1
andalso String.sub (str, pos + 1) = #"\n"
then
buildTextStringAfterCursor
( pos + 2, str, acc, startX, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
)
else
buildTextStringAfterCursor
( pos + 1, str, acc, startX, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
)
else
(* return if there is no more vertical space after line break *)
accToDrawMsg (acc, cursorAcc)
| chr =>
(* for any other character, add it to acc if there is space,
* and proceed forward one character in the string *)
let
val chrFun = Vector.sub (CozetteAscii.asciiTable, Char.ord chr)
in
if posX + xSpace < windowWidth then
(* if there is horizontal space, place char on the right *)
let
val chrVec = chrFun
(posX, posY, fontSize, fontSize, fWindowWidth, fWindowHeight, r, g, b)
val acc = chrVec :: acc
in
buildTextStringAfterCursor
( pos + 1, str, acc, posX + xSpace, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
)
end
else if posY + ySpace < windowHeight then
(* if there is vertical space, place char down below at startX *)
let
val chrVec = chrFun
( startX, posY + ySpace, fontSize, fontSize
, fWindowWidth, fWindowHeight
, r, g, b
)
val acc = chrVec :: acc
in
buildTextStringAfterCursor
( pos + 1, str, acc, startX + xSpace, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
)
end
else
(* return if no space horizontally or vertically *)
accToDrawMsg (acc, cursorAcc)
end
else
(* if we reached the end of the string,
* call function to build next string *)
continueBuildTextLineGapAfterCursor
( tl, acc, posX, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, cursorAcc
)
and continueBuildTextLineGapAfterCursor
( strList, acc, posX, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, cursorAcc
) =
case strList of
hd :: tl =>
buildTextStringAfterCursor
( 0, hd, acc, posX, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
)
| [] => accToDrawMsg (acc, cursorAcc)
(* same as buildTextStringAfterCursor, except this keeps track of absolute
* index and cursor pos too *)
fun buildTextStringBeforeCursor
( pos, str, acc, posX, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx, cursorPos, hr, hg, hb
) =
if pos < String.size str then
case String.sub (str, pos) of
#" " =>
buildTextStringBeforeCursor
( pos + 1, str, acc, posX + xSpace, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
)
| #"\t" =>
buildTextStringBeforeCursor
( pos + 1, str, acc, posX + xSpace3, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
)
| #"\n" =>
if posY + ySpace < windowHeight then
buildTextStringBeforeCursor
( pos + 1, str, acc, startX, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
)
else
accToDrawMsg (acc, [])
| #"\r" =>
if posY + ySpace < windowHeight then
if
pos < String.size str - 1
andalso String.sub (str, pos + 1) = #"\n"
then
buildTextStringBeforeCursor
( pos + 2, str, acc, startX, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 2, cursorPos, hr, hg, hb
)
else
buildTextStringBeforeCursor
( pos + 1, str, acc, startX, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
)
else
accToDrawMsg (acc, [])
| chr =>
let
val chrFun = Vector.sub (CozetteAscii.asciiTable, Char.ord chr)
in
if posX + xSpace < windowWidth then
let
val chrVec = chrFun
(posX, posY, fontSize, fontSize, fWindowWidth, fWindowHeight, r, g, b)
val acc = chrVec :: acc
in
buildTextStringBeforeCursor
( pos + 1, str, acc, posX + xSpace, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
)
end
else if posY + ySpace < windowHeight then
let
val chrVec = chrFun
( startX, posY + ySpace, fontSize, fontSize
, fWindowWidth, fWindowHeight
, r, g, b
)
val acc = chrVec :: acc
in
buildTextStringBeforeCursor
( pos + 1, str, acc, startX + xSpace, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
)
end
else
accToDrawMsg (acc, [])
end
else
continueBuildTextLineGapBeforeCursor
( tl, acc, posX, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, absIdx, cursorPos, hr, hg, hb
)
and buildTextStringWithinCursor
fun buildTextString
( pos, str, acc, posX, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx, cursorPos, cursorAcc, hr, hg, hb
@@ -287,7 +80,7 @@ struct
* else, just skip as usual *)
if absIdx <> cursorPos then
(* not in cursur *)
buildTextStringWithinCursor
buildTextString
( pos + 1, str, acc, posX + xSpace, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
@@ -297,32 +90,23 @@ struct
let
val cursorAcc = buildCursor (posX, posY, fWindowWidth, fWindowHeight, r, g ,b)
in
buildTextStringAfterCursor
buildTextString
( pos + 1, str, acc, posX + xSpace, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
)
end
| #"\t" =>
(* todo: draw cursor if cursor is on tab
* but this is not a priority right now *)
buildTextStringWithinCursor
( pos + 1, str, acc, posX + xSpace3, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
)
| #"\n" =>
if posY + ySpace < windowHeight then
if absIdx <> cursorPos then
(* not in cursor position, so iterate like normal *)
buildTextStringWithinCursor
buildTextString
( pos + 1, str, acc, startX, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
)
else
(* in cursor position, so build cursorAcc
* and call AfterCursor function *)
(* in cursor position, so build cursorAcc *)
if pos = String.size str - 1 andalso tl = [] then
(* if we are at end of lineGap, we want to build cursorAcc
* at different coordinates than usual *)
@@ -336,33 +120,14 @@ struct
let
val cursorAcc = buildCursor (posX, posY, fWindowWidth, fWindowHeight, r, g ,b)
in
buildTextStringAfterCursor
buildTextString
( pos + 1, str, acc, startX, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
)
end
else
accToDrawMsg (acc, cursorAcc)
| #"\r" =>
if posY + ySpace < windowHeight then
if
pos < String.size str - 1
andalso String.sub (str, pos + 1) = #"\n"
then
buildTextStringWithinCursor
( pos + 2, str, acc, startX, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 2, cursorPos, cursorAcc, hr, hg, hb
)
else
buildTextStringWithinCursor
( pos + 1, str, acc, startX, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
)
else
accToDrawMsg (acc, cursorAcc)
| chr =>
let
val chrFun = Vector.sub (CozetteAscii.asciiTable, Char.ord chr)
@@ -375,7 +140,7 @@ struct
(posX, posY, fontSize, fontSize, fWindowWidth, fWindowHeight, r, g, b)
val acc = chrVec :: acc
in
buildTextStringWithinCursor
buildTextString
( pos + 1, str, acc, posX + xSpace, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
@@ -390,7 +155,7 @@ struct
)
val acc = chrVec :: acc
in
buildTextStringWithinCursor
buildTextString
( pos + 1, str, acc, startX + xSpace, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
@@ -414,10 +179,10 @@ struct
in
(* can start building after cursor now,
* since cursor was built *)
buildTextStringAfterCursor
buildTextString
( pos + 1, str, acc, posX + xSpace, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
)
end
else if posY + ySpace < windowHeight then
@@ -431,48 +196,28 @@ struct
in
(* can start building after cursor now,
* since cursor was built *)
buildTextStringAfterCursor
buildTextString
( pos + 1, str, acc, startX + xSpace, posY + ySpace, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, cursorAcc
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
)
end
else
accToDrawMsg (acc, cursorAcc)
end
end
else
(* we have built cursor now, so can call after-cursor function
* to build rest of text *)
continueBuildTextLineGapAfterCursor
( tl, acc, posX, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, cursorAcc
)
and continueBuildTextLineGapBeforeCursor
( strList, acc, posX, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, absIdx, cursorPos, hr, hg, hb
) =
case strList of
hd :: tl =>
if cursorPos >= absIdx + cursorPos then
(* if end of string is before cursor *)
buildTextStringBeforeCursor
( 0, hd, acc, posX, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx, cursorPos, hr, hg, hb
)
else
(* if within cursor *)
buildTextStringWithinCursor
( 0, hd, acc, posX, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx, cursorPos, [], hr, hg, hb
)
| [] => accToDrawMsg (acc, [])
case tl of
hd :: tl =>
buildTextString
( 0, hd, acc, posX, posY, startX
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
, r, g, b, tl, absIdx, cursorPos, cursorAcc, hr, hg, hb
)
| [] =>
accToDrawMsg (acc, cursorAcc)
fun build
(startLine, cursorPos, lineGap: LineGap.t, windowWidth, windowHeight) =
@@ -502,28 +247,15 @@ struct
0
val absIdx = curIdx + startIdx
in
if cursorPos < curIdx + String.size rStrHd then
(* if cursor is within string *)
buildTextStringWithinCursor
( startIdx, rStrHd, []
, 5, 5, 5
, windowWidth, windowHeight
, Real32.fromInt windowWidth, Real32.fromInt windowHeight
, 0.67, 0.51, 0.83
, rStrTl, absIdx, cursorPos, []
, 0.211, 0.219, 0.25
)
else
(* if cursor is after string *)
buildTextStringBeforeCursor
( startIdx, rStrHd, []
, 5, 5, 5
, windowWidth, windowHeight
, Real32.fromInt windowWidth, Real32.fromInt windowHeight
, 0.67, 0.51, 0.83
, rStrTl, absIdx, cursorPos
, 0.211, 0.219, 0.25
)
buildTextString
( startIdx, rStrHd, []
, 5, 5, 5
, windowWidth, windowHeight
, Real32.fromInt windowWidth, Real32.fromInt windowHeight
, 0.67, 0.51, 0.83
, rStrTl, absIdx, cursorPos, []
, 0.211, 0.219, 0.25
)
end
| (_, _) =>
(* requested line goes beyond the buffer,