Custom controls variables

Custom controls variables

Available variables

Screen size variables

• screen_width: width of screen.
• screen_height: height of screen.

Control variables

• width: width of the control button itself.
• height: height of the control button itself.

Position variables

• top: top of screen, current is 0.
• left: left of screen, current is 0.
• right: right of screen, calculated as ${screen_width} - ${width} - ${margin}.
• bottom: bottom of screen, calculated as ${screen_height} - ${height} - ${margin}.

Other variables

• margin: margin, current is 2dp.

How does it work

Currently, variables are only apply for Dynamic X and Y, which in format ${variable}. For example

"dynamicX": "${screen_width} - ${width} * 2 + ${margin}"

With these given properties:

• Screen width: 1280
• Button width: 100
• Margin: 2dp, convert into pixels unit: 4px

It will be converted into

"dynamicX": "1280 - 100 * 2 + 4"

Then, the x field (stored in the memory when paste a control json) is being calculated from dynamicX use exp4j.

ControlData controlData = ...
controlData.x = new ExpressionBuilder(controlData.dynamicX).build().evaluate();