Hide Button (added in onLayout) in onUpdate

I'm developing an app for my VivoActive 4 which currently has a Button containing a bitmap, which is added via onLayout(dc) so I can set/handle a `behavior`...

    var myBtn = null;
    function onLayout(dc) {
        var elements = [];
        var myBitmap = new WatchUi.Bitmap({:rezId=>Rez.Drawables.MyIcon});
        myBtn = new WatchUi.Button({
            :locX=>50,
            :locY=>50,
            :width=>50,
            :height=>50,
            :stateDefault=>myBitmap,
            :stateHighlighted=>myBitmap,
            :behavior=>:onBtnClicked
        });
        elements.add(myBtn);
        setLayout(elements);
    }

Is it possible to hide/remove the button and/or image after the onLayout has run?

I've tried accessing either the button or the image within `onUpdate(dc)` but I simply cannot figure out a way to get it to disappear in response to an action.

Can somebody please point me in the right direction.

Cheers,

Tom

0 _psx_ over 4 years ago

I haven't tested it but there is mLayout member in view so if button is only element try to assign null to mLayout.

0 Tom101449 over 4 years ago in reply to _psx_

Thanks for your response.

It isn't the only element, there are multiple buttons within "elements"... the code is just an example of how I'm adding the button/bitmap. When I first tried creating an app a couple of years ago, I couldn't get my head around layouts, and this was the only way I managed to add an image-based button with a event handler

0 _psx_ over 4 years ago in reply to Tom101449

so go to memory monitor find mLayout in view and check it type - probably array or dictionary and then use proper function to remove element.

The only problem is you don't use ID for controls

0 Tom101449 over 4 years ago in reply to _psx_

Excellent - mLayout is the hint I needed :-)

mLayout.remove(myBtn);
requestUpdate();

0 _psx_ over 4 years ago in reply to Tom101449

very good, so it's an array and you don't need ID because you can remove first found object

why don't you use simple

myBtn.etVisible(false)

0 Tom101449 over 4 years ago in reply to _psx_

Because a) I didn't know it existed (nothing in documentation) and b) it doesn't actually seem to exist in the first place (undefined symbol).

Is there a particular framework that is required for that?

Otherwise I'll stick with the mLayout.remove();

0 _psx_ over 4 years ago in reply to Tom101449

remove is better if you don't need it more - system even won't try draw it

Inherits:

Toybox.Lang.Object

Toybox.WatchUi.Drawable

Toybox.WatchUi.Selectable

Toybox.WatchUi.Button

so you can use Button.setVisible because it exist in Drawable