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add system cursors support to emscripten #155

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Merged
treeform merged 1 commit into from
Dec 18, 2025
Merged

add system cursors support to emscripten #155

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7 changes: 6 additions & 1 deletion src/windy/platforms/emscripten/emdefs.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -153,6 +153,11 @@ EM_JS(void, setup_drag_drop_handlers_internal, (const char* target, void* userDa
}
}, false);
});

EM_JS(void, set_cursor, (const char* cursor), {
const cursorUtf8 = UTF8ToString(cursor);
Module.canvas.style.cursor = cursorUtf8;
});
""".}

proc get_window_width*(): cint {.importc.}
Expand All @@ -168,8 +173,8 @@ proc get_window_url_into*(output: cstring, maxLen: cint): cint {.importc.}
proc get_device_pixel_ratio*(): cdouble {.importc.}
proc open_temp_text_file*(title, text: cstring) {.importc.}
proc open_url*(url: cstring) {.importc.}

proc setup_drag_drop_handlers_internal*(target: cstring, userData: pointer) {.importc.}
proc set_cursor*(cursor: cstring) {.importc.}

type
EMSCRIPTEN_RESULT* = cint
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33 changes: 32 additions & 1 deletion src/windy/platforms/emscripten/platform.nim
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Expand Up @@ -330,7 +330,38 @@ proc cursor*(window: Window): Cursor =

proc `cursor=`*(window: Window, cursor: Cursor) =
window.state.cursor = cursor
# TODO: Apply CSS cursor style based on cursor type
case cursor.kind:
of ArrowCursor:
set_cursor("auto")
of PointerCursor:
set_cursor("pointer")
of IBeamCursor:
set_cursor("text")
of CrosshairCursor:
set_cursor("crosshair")
of ClosedHandCursor:
set_cursor("grabbing")
of OpenHandCursor:
set_cursor("grab")
of ResizeLeftCursor:
set_cursor("w-resize")
of ResizeRightCursor:
set_cursor("e-resize")
of ResizeLeftRightCursor:
set_cursor("col-resize")
of ResizeUpCursor:
set_cursor("n-resize")
of ResizeDownCursor:
set_cursor("s-resize")
of ResizeUpDownCursor:
set_cursor("row-resize")
of OperationNotAllowedCursor:
set_cursor("not-allowed")
of WaitCursor:
set_cursor("wait")
of CustomCursor:
# TODO base64 encode Image?
set_cursor("auto")

# Style functions
proc style*(window: Window): WindowStyle =
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