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Level 8

Can text be centered in a Scene Graph Button?

See image below. The button node doesn't seem to allow me to center the text. Even when I add empty spaces "    " they are trimmed away. The first two buttons have spaces and a period so I can test my trimming theory. Am I looking passed something simple? 

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7 Replies
Level 8

Re: Can text be centered in a Scene Graph Button?

I have a ButtonGroup with buttons that are centered. I'm not sure if there's an easier way:


buttons="["   Play   ","   Stop   "]"
https://github.com/belltown/
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Highlighted
Level 8

Re: Can text be centered in a Scene Graph Button?

Thank you. I'll give this a try. I'm worried a solution like this wont scale well with different screen resolutions. We'll find out...
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Level 11

Re: Can text be centered in a Scene Graph Button?

"jedashford" wrote:
Thank you. I'll give this a try. I'm worried a solution like this wont scale well with different screen resolutions. We'll find out...

I think I got this to work by having a Label that's a child element of the button, (and the same width) and the label text can be centered with;
<Label id="itemLabel" horizAlign="center" />
aspiring
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Highlighted
Level 8

Re: Can text be centered in a Scene Graph Button?

"joetesta" wrote:
I think I got this to work by having a Label that's a child element of the button, (and the same width) and the label text can be centered with;
<Label id="itemLabel" horizAlign="center" />


Thats the key. Works like a charm.
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Highlighted
Level 7

Re: Can text be centered in a Scene Graph Button?

Can I ask how you created this horizontal button group?  I am having a heck of a time creating something very simular to this.
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Highlighted
Level 8

Re: Can text be centered in a Scene Graph Button?

If anyone else stumbles on this, this solution would've required a lot more work for me, dealing with changing the color of the Label when the button gains and loses focus. While hokey, this little utility function fixed the problem for me:

sub centerButtonLabel(button as object)
    for i = 0 to button.getChildCount() - 1
        child = button.getChild(i)
        if child.subtype() = "Label"
            child.horizAlign = "center"
        end if
    end for
end sub

I just call this in the onVisible for my screen. Works like a charm. Should Roku just support this as a property on the stock Button? Yes.

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Highlighted
Level 8

Re: Can text be centered in a Scene Graph Button?

Ok here's a better solution since horizAlign appears to get reverted when the button text is changed. Use this component instead:

<component name="CenteredButton" extends="Button">
    <script type="text/brightscript">
        <![CDATA[
        sub init()
            ' Find the label
            for i = 0 to m.top.getChildCount() - 1
                child = m.top.getChild(i)
                if child.subtype() = "Label"
                    child.horizAlign = "center"
                    child.observeField("horizAlign", "onHorizAlignChanged")
                    exit for
                end if
            end for
        end sub

        sub onHorizAlignChanged(msg as object)
            label = msg.getRoSGNode()
            if label.horizAlign <> "center"
                label.horizAlign = "center"
            end if
        end sub
        ]]>
    </script>
</component>
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