Here's a little more detail of what I was suggesting. I haven't looked at the sample code in the KB article you referenced, but let's take something like BarGraphField. I assume that it overrides the usual suspects: layout(), paint(), getPreferredWidth(), and getPreferredHeight(). These would probably not need to be changed. Instead, you would do the following:
- Add a member variable (let's call it focusBar) that is the index of the bar with the current focus, initially set to -1.
- Override isFocusable() to return true.
- Override drawFocus() or getFocusRect() to draw an outline around focusBar, so the user knows which bar is currently selected.
- Override onFocus() to give either the first or last bar focus, depending on the direction. Also override onUnfocus() to set focusBar to -1 again.
- Override both moveFocus() methods to change focusBar. (You may need to maintain additional variables about the geometry of the bars in order to do the drawing and focus moves.)
I may have left out some steps, but I think that covers it. It will take some experimenting to get everything right.
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