All you have to do is call measure() on the children yourself. Or you could
just use layout params :)
On Mar 3, 2013 12:04 PM, "Michael Dunn" <[email protected]> wrote:
> Thanks Mr. Guy. What would be the minimum required to use a value instead
> of LayoutParams (on the entire tree)? I don't believe this works:
>
> @Override
> protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
> setMeasuredDimension(mWidth, mHeight);
> }
>
>
> On Sun, Mar 3, 2013 at 11:52 AM, Romain Guy <[email protected]> wrote:
>
>> You call measureChildren() which in turns call measureChild() which looks
>> at the LayoutParams of each child.
>> On Mar 1, 2013 10:12 PM, "momo" <[email protected]> wrote:
>>
>>> I have a custom ViewGroup that's only ever managing the size and
>>> position of one child. I've override onMeasure and onLayout so that
>>> LayoutParams are never examined, yet it fails unless I do provide
>>> LayoutParams. Here are abbreviated summaries of the relevant portions of
>>> the class:
>>>
>>>
>>> public class SomeSpecialLayoutManager extends ViewGroup {
>>>
>>> @Override
>>> protected void onMeasure(int widthMeasureSpec, int
>>> heightMeasureSpec) {
>>> measureChildren(widthMeasureSpec, heightMeasureSpec);
>>> int w = mChild.getMeasuredWidth();
>>> int h = mChild.getMeasuredHeight();
>>> w = Math.max(w, getSuggestedMinimumWidth());
>>> h = Math.max(h, getSuggestedMinimumHeight());
>>> w = resolveSize(w, widthMeasureSpec);
>>> h = resolveSize(h, heightMeasureSpec);
>>> setMeasuredDimension(w, h);
>>> }
>>>
>>> @Override
>>> protected void onLayout(boolean changed, int l, int t, int r, int b)
>>> {
>>> mChild.layout( 0, 0, mWidth, mHeight );
>>> }
>>> }
>>>
>>>
>>> Using the above, the following *does* work:
>>>
>>> LayoutParams lp = mChild.getLayoutParams();
>>> lp.width = mWidth;
>>> lp.height = mHeight;
>>> mChild.setLayoutParams( lp );
>>>
>>> But since neither `onMeasure` nor `onLayout` even makes reference to
>>> `LayoutParams`, I wonder why it's required, or even how it's referenced at
>>> all. I would assume that since the layout pass grabs `mWidth` and
>>> `mHeight` directly, there'd be no need for the `LayoutParams` at all - and
>>> that a call to requestLayout would update it appropriately.
>>>
>>> However, when I isolate the above in a small program outside of a
>>> complicated View tree with scrolling layers that exceed "normal" container
>>> sizes, it *does* work as expected, so I have to assume the issue is in the
>>> measure pass.
>>>
>>> I've read as much documentation as I can find about what's going on
>>> during the measure and layout passes, and examined the source, but I
>>> believe I must be missing something.
>>>
>>> TYIA.
>>>
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