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size emscripten canvas from iframe #187

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Merged
treeform merged 1 commit into from
Aug 26, 2026
Merged

size emscripten canvas from iframe #187

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21 changes: 21 additions & 0 deletions src/windy/platforms/emscripten/emdefs.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -18,10 +18,22 @@ proc emscripten_sleep*(ms: cuint) {.importc.}
#include <GLES2/gl2.h>

EM_JS(int, get_window_width, (), {
var canvas = (typeof Module !== 'undefined' && Module.canvas)
? Module.canvas
: document.getElementById('canvas');
if (canvas && canvas.clientWidth > 0) {
return canvas.clientWidth;
}
return window.innerWidth;
});

EM_JS(int, get_window_height, (), {
var canvas = (typeof Module !== 'undefined' && Module.canvas)
? Module.canvas
: document.getElementById('canvas');
if (canvas && canvas.clientHeight > 0) {
return canvas.clientHeight;
}
return window.innerHeight;
});

Expand All @@ -42,6 +54,15 @@ EM_JS(void, setup_windy_runtime, (), {
Module.canvas.windyContextHandlerAdded = true;
}

if (Module.canvas && !Module.canvas.windyResizeObserverAdded &&
typeof ResizeObserver !== 'undefined') {
var observer = new ResizeObserver(function() {
window.dispatchEvent(new Event('resize'));
});
observer.observe(Module.canvas);
Module.canvas.windyResizeObserverAdded = true;
}

if (!window.windyErrorHandlerAdded) {
window.addEventListener("error", function() {
console.info("Exception thrown, see JavaScript console");
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