Haxe

random suggestion: in haxeui-flixel, scrolling in a scrollable container should block the scroll event from bubbling up the chain to other scrollable parent containers, i.e. dropdown scrolling should block scrolling in parent scrollview

what am i doing wrong? this throws "Nothing to write"

```haxe
var save = new haxe.ui.containers.dialogs.SaveFileDialog();
save.options = {
    title: "Save Page Number" + (editor.pages.getChildIndex(this) + 1),
    writeAsBinary: true
};
save.fileInfo = {
    name: fileName,
    isBinary: true,
    bytes: switch type {
        case PNG: bmp.encode(bmp.rect, new PNGEncoderOptions());
        case JPG: bmp.encode(bmp.rect, new JPEGEncoderOptions());
        default: throw new Exception("Unsupported file type");
    }
};
        
save.show();
```

```haxe
        if (fileInfo == null || (fileInfo.text == null && fileInfo.bytes == null)) {
            throw "Nothing to write";
        }
```

are you sure bmp.encode(...) is leading to non-null bytes?

theres no reason for it to return null tho

maybe `BitmapData.encode()` doesnt like html

does `trace(bmp.encode(bmp.rect, new PNGEncoderOptions()) == null)` trace true or false?

ill check hashlink and see if the error persists

i dunno about _why_ its null... maybe rect is 0x0? Maybe bmp isnt valid?

bmp is just a copy of `this` bitmap, so it cant be null (its displayrd on the screen)

... no idea then.. code seems sensible from a reading perspective

see if you can repro it minimally, easy to work out if its a bug or a user issue that way (or a feature 🙂 )

```haxe
bmp.encode(bmp.rect, new PNGEncoderOptions(), byteArr);
```
this returns the correct value, even tho a byteArray is optional there

https://github.com/openfl/openfl/blob/develop/src/openfl/display/BitmapData.hx#L1149

ok, i think i get it... its:
```
byteArray = null;
return null;
```
when none of the other branches match