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change AppUpdate.update function to return a list, so we can return multiple messages from a single event

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This commit is contained in:
Humza Shahid
2024-09-27 08:27:53 +01:00
parent 57fbf5f1aa
commit e3ff121a35
4 changed files with 67 additions and 40 deletions
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84
functional-core/app/app-update.sml
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@@ -1,7 +1,7 @@
signature APP_UPDATE =
sig
val update: AppType.app_type * InputMessage.t
-> AppType.app_type * UpdateMessage.t
-> AppType.app_type * UpdateMessage.t list
end
structure AppUpdate :> APP_UPDATE =
@@ -32,8 +32,9 @@ struct
val drawVec = TriangleStage.toVector (model, drawVec)
val drawMsg = DRAW_DOT drawVec
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
fun getDrawDotMsgWhenArrowIsAtBoundary model =
@@ -42,8 +43,9 @@ struct
val dotVec = getDotVecFromIndices (model, arrowX, arrowY)
val dotVec = TriangleStage.toVector (model, dotVec)
val drawMsg = DRAW_DOT dotVec
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
fun moveArrowUp (model: app_type) =
@@ -58,8 +60,9 @@ struct
val dotVec = getDotVecFromIndices (model, arrowX, newArrowY)
val dotVec = TriangleStage.toVector (model, dotVec)
val drawMsg = DRAW_DOT dotVec
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
else
getDrawDotMsgWhenArrowIsAtBoundary model
@@ -77,8 +80,9 @@ struct
val dotVec = getDotVecFromIndices (model, newArrowX, arrowY)
val dotVec = TriangleStage.toVector (model, dotVec)
val drawMsg = DRAW_DOT dotVec
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
else
getDrawDotMsgWhenArrowIsAtBoundary model
@@ -96,8 +100,9 @@ struct
val dotVec = getDotVecFromIndices (model, newArrowX, arrowY)
val dotVec = TriangleStage.toVector (model, dotVec)
val drawMsg = DRAW_DOT dotVec
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
else
getDrawDotMsgWhenArrowIsAtBoundary model
@@ -115,8 +120,9 @@ struct
val dotVec = getDotVecFromIndices (model, arrowX, newArrowY)
val dotVec = TriangleStage.toVector (model, dotVec)
val drawMsg = DRAW_DOT dotVec
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
else
getDrawDotMsgWhenArrowIsAtBoundary model
@@ -152,24 +158,26 @@ struct
let
val drawVec = TriangleStage.toVector (model, dotVec)
val drawMsg = DRAW_DOT drawVec
val drawMsg = [DRAW drawMsg]
val newTriangleStage = FIRST {x1 = hpos, y1 = vpos}
val model = AppWith.addTriangleStage
(model, newTriangleStage, newUndoTuple, hIdx, vIdx)
in
(model, DRAW drawMsg)
(model, drawMsg)
end
| FIRST {x1, y1} =>
let
val drawVec = TriangleStage.firstToVector (x1, y1, dotVec, model)
val drawMsg = DRAW_DOT drawVec
val drawMsg = [DRAW drawMsg]
val newTriangleStage = SECOND
{x1 = x1, y1 = y1, x2 = hpos, y2 = vpos}
val model = AppWith.addTriangleStage
(model, newTriangleStage, newUndoTuple, hIdx, vIdx)
in
(model, DRAW drawMsg)
(model, drawMsg)
end
| SECOND {x1, y1, x2, y2} =>
let
@@ -177,15 +185,16 @@ struct
(model, x1, y1, x2, y2, hpos, vpos, newUndoTuple, hIdx, vIdx)
val drawVec = Triangles.toVector model
val drawMsg = DRAW_TRIANGLES_AND_RESET_DOTS drawVec
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
end
fun mouseLeftClick model =
case ClickPoints.getClickPositionFromMouse model of
SOME (hIdx, vIdx) => addCoordinates (model, hIdx, vIdx)
| NONE => (model, NO_MAILBOX)
| NONE => (model, [])
fun enterOrSpaceCoordinates model =
let val {arrowX, arrowY, ...} = model
@@ -206,8 +215,9 @@ struct
val drawMsg =
RESIZE_TRIANGLES_DOTS_AND_GRAPH
{triangles = triangles, graphLines = graphLines, dots = dots}
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
fun undoAction model =
@@ -218,7 +228,7 @@ struct
val model =
AppWith.undo (model, NO_TRIANGLE, #triangles model, (x1, y1))
in
(model, DRAW CLEAR_DOTS)
(model, [DRAW CLEAR_DOTS])
end
| SECOND {x1, y1, x2, y2} =>
(* Change FIRST to SECOND and redraw dots. *)
@@ -230,8 +240,9 @@ struct
val emptyVec: Real32.real vector = Vector.fromList []
val drawVec = TriangleStage.firstToVector (x1, y1, emptyVec, model)
val drawMsg = DRAW_DOT drawVec
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
| NO_TRIANGLE =>
(case #triangles model of
@@ -251,12 +262,13 @@ struct
val drawMsg =
DRAW_TRIANGLES_AND_DOTS
{triangles = newTriangleVec, dots = drawVec}
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
| [] =>
(* Can't undo, because there are no actions to undo. *)
(model, NO_MAILBOX))
(model, []))
fun redoAction model =
case #redo model of
@@ -274,8 +286,9 @@ struct
val emptyVec: Real32.real vector = Vector.fromList []
val drawVec = TriangleStage.firstToVector (x, y, emptyVec, model)
val drawMsg = DRAW_DOT drawVec
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
| FIRST {x1, y1} =>
(* add to triangle stage, redraw dots *)
@@ -289,8 +302,9 @@ struct
val drawVec = TriangleStage.secondToVector
(x1, y1, x, y, emptyVec, model)
val drawMsg = DRAW_DOT drawVec
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
| SECOND {x1, y1, x2, y2} =>
(* clear triangle stage, add to trinagle list and redraw triangles *)
@@ -304,44 +318,50 @@ struct
val drawVec = Triangles.toVector model
val drawMsg = DRAW_TRIANGLES_AND_RESET_DOTS drawVec
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end)
| [] => (* Nothing to redo. *) (model, NO_MAILBOX)
| [] => (* Nothing to redo. *) (model, [])
fun toggleGraph (model: app_type) =
if #showGraph model then
let
val model = AppWith.graphVisibility (model, false)
val drawMsg = DRAW_GRAPH (Vector.fromList [])
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
else
let
val model = AppWith.graphVisibility (model, true)
val graphLines = GraphLines.generate model
val drawMsg = DRAW_GRAPH graphLines
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
fun getSaveTrianglesMsg model =
let
val {triangles, ...} = model
val fileMsg = SAVE_TRIANGLES triangles
val fileMsg = [FILE fileMsg]
in
(model, FILE fileMsg)
(model, fileMsg)
end
fun getLoadTrianglesMsg model = (model, FILE LOAD_TRIANGLES)
fun getLoadTrianglesMsg model =
(model, [FILE LOAD_TRIANGLES])
fun getExportTrianglesMsg model =
let
val {triangles, ...} = model
val fileMsg = EXPORT_TRIANGLES (#triangles model)
val fileMsg = [FILE fileMsg]
in
(model, FILE fileMsg)
(model, fileMsg)
end
fun useTriangles (model, triangles) =
@@ -349,28 +369,28 @@ struct
val model = AppWith.useTriangles (model, triangles)
val drawVec = Triangles.toVector model
val drawMsg = DRAW_TRIANGLES_AND_RESET_DOTS drawVec
val drawMsg = [DRAW drawMsg]
in
(model, DRAW drawMsg)
(model, drawMsg)
end
fun trianglesLoadError model = (model, NO_MAILBOX)
fun trianglesLoadError model = (model, [])
fun enterBrowseMode model =
let
val model = AppWith.mode (model, AppType.BROWSE_MODE)
(* todo: should draw modal window as well *)
val fileMsg = LOAD_FILES (#openFilePath model)
val fileMsg = [FILE fileMsg]
in
(model, FILE fileMsg)
(model, fileMsg)
end
fun handleFileBrowserAndPath (model, fileBrowser, path) =
let
val model = AppWith.fileBrowserAndPath (model, fileBrowser, path)
let val model = AppWith.fileBrowserAndPath (model, fileBrowser, path)
(* todo: update and recreate vector indicating text to redraw,
* if not in normal mode *)
in
(model, NO_MAILBOX)
in (model, [])
end
fun updateNormalMode (model: app_type, inputMsg) =

13
imperative-shell/update-thread.sml
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@@ -17,13 +17,20 @@ struct
case updateMsg of
DRAW drawMsg => Mailbox.send (drawMailbox, drawMsg)
| FILE fileMsg => Mailbox.send (fileMailbox, fileMsg)
| NO_MAILBOX => ()
fun handleMsgs (drawMailbox, fileMailbox, lst) =
case lst of
hd :: tl =>
let val _ = handleMsg (drawMailbox, fileMailbox, hd)
in handleMsgs (drawMailbox, fileMailbox, tl)
end
| [] => ()
fun loop (inputMailbox, drawMailbox, fileMailbox, model) =
let
val inputMsg = Mailbox.recv inputMailbox
val (model, updateMsg) = AppUpdate.update (model, inputMsg)
val _ = handleMsg (drawMailbox, fileMailbox, updateMsg)
val (model, updateMsgs) = AppUpdate.update (model, inputMsg)
val _ = handleMsgs (drawMailbox, fileMailbox, updateMsgs)
in
loop (inputMailbox, drawMailbox, fileMailbox, model)
end

4
message-types/update-msg.sml
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@@ -1,7 +1,7 @@
signature UPDATE_MESSAGE =
sig
datatype t = DRAW of DrawMessage.t | FILE of FileMessage.t | NO_MAILBOX
datatype t = DRAW of DrawMessage.t | FILE of FileMessage.t
end
structure UpdateMessage :> UPDATE_MESSAGE =
struct datatype t = DRAW of DrawMessage.t | FILE of FileMessage.t | NO_MAILBOX end
struct datatype t = DRAW of DrawMessage.t | FILE of FileMessage.t end