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package
com.phodev.andtools.widget;
import
android.content.Context;
import
android.graphics.Rect;
import
android.util.AttributeSet;
import
android.view.View;
import
android.view.ViewGroup;
/**
*
由于ListView，Gridiew,等高度设置为wrap_content的时候会有问题，如果此时下面还有其他view，
*
当AdapterView的item很多的上海，不仅scroll有问题,底部跟随的view也会跑到可是范围外
*
*
<pre>
*
<com.phodev.widgets.AutoFollowBox>
*
<ListView
*
android:layout_width="fill_parent"
*
android:layout_height="wrap_content"// 必须是wrap content,否则没有必要使用该组建，直接布局即可
*
/>
*
<OtherView/>//有切只有有一个OtherView如果底部是多个View，可以放到一个布局里面。总是AutoFollowBox有切职能有两个Child
*
<com.phodev.widgets.AutoFollowBox/>
*
</pre>
*
*
@author sky
*
*/
public
class
AutoFollowBox extends
ViewGroup {
public
AutoFollowBox(Context context, AttributeSet attrs) {
super(context,
attrs);
}
public
AutoFollowBox(Context context) {
super(context);
}
private
Rect marginInfo = new
Rect();
@Override
protected
void
onLayout(boolean
changed, int
l, int
t, int
r, int
b) {
int
childCount = getChildCount();
int
maxW = r - l;
int
cl, ct, cr, cb;
int
heightOffset = 0;
for
(int
i = 0;
i < childCount; i++) {
View
v = getChildAt(i);
getMargingInfo(v,
marginInfo);
cl
= marginInfo.left;
ct
= marginInfo.top + heightOffset;
cr
= maxW - marginInfo.right;
cb
= ct + v.getMeasuredHeight();
v.layout(cl,
ct, cr, cb);
heightOffset
= cb + marginInfo.bottom;
}
}
@Override
protected
void
onMeasure(int
widthMeasureSpec, int
heightMeasureSpec) {
int
childCount = getChildCount();
if
(childCount != 2)
{
throw
new
RuntimeException(
"mast
only 2 views is AutoFoolowAdapterViewBox");
}
//
View
stretchView = getChildAt(0);
View
followView = getChildAt(1);
//
start measure
int
offsetBottom = 0;
int
followViewHeihgt = 0;
if
(followView.getVisibility() == View.VISIBLE) {
LayoutParams
lp = followView.getLayoutParams();
measureChildWithMargins(followView,
widthMeasureSpec, 0,
heightMeasureSpec,
0);
followViewHeihgt
= followView.getMeasuredHeight();
if
(lp instanceof
MarginLayoutParams) {
MarginLayoutParams
mlp = (MarginLayoutParams) lp;
offsetBottom
= mlp.topMargin + mlp.bottomMargin
+
followViewHeihgt;
}
}
//
if
(stretchView.getVisibility() == View.VISIBLE) {
measureChildWithMargins(stretchView,
widthMeasureSpec, 0,
heightMeasureSpec,
offsetBottom);
}
//
int
maxWantWitdh = Math.max(getMeasuerWidthWithMarging(followView),
getMeasuerWidthWithMarging(stretchView));
int
maxWantHeight = getMeasuerHeightWithMarging(stretchView)
+
getMeasuerHeightWithMarging(followView);
//
int
measuredWidth = resolveSize(maxWantWitdh, widthMeasureSpec);
int
measuredHeight = resolveSize(maxWantHeight, heightMeasureSpec);
setMeasuredDimension(measuredWidth,
measuredHeight);
}
private
int
getMeasuerHeightWithMarging(View v) {
LayoutParams
lp = v.getLayoutParams();
int
hAdd = 0;
if
(lp instanceof
MarginLayoutParams) {
MarginLayoutParams
mlp = (MarginLayoutParams) lp;
hAdd
= mlp.topMargin + mlp.bottomMargin;
}
return
v.getMeasuredHeight() + hAdd;
}
private
int
getMeasuerWidthWithMarging(View v) {
LayoutParams
lp = v.getLayoutParams();
int
wAdd = 0;
if
(lp instanceof
MarginLayoutParams) {
MarginLayoutParams
mlp = (MarginLayoutParams) lp;
wAdd
= mlp.leftMargin + mlp.rightMargin;
}
return
v.getMeasuredWidth() + wAdd;
}
private
void
getMargingInfo(View v, Rect out) {
if
(v != null
&& v.getLayoutParams() instanceof
MarginLayoutParams) {
MarginLayoutParams
mlp = (MarginLayoutParams) v.getLayoutParams();
//
out.set(mlp.leftMargin,//
mlp.topMargin,//
mlp.rightMargin,//
mlp.bottomMargin);
}
else
{
out.set(0,
0,
0,
0);
}
}
@Override
protected
LayoutParams generateDefaultLayoutParams() {
return
new
MarginLayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
}
@Override
public
LayoutParams generateLayoutParams(AttributeSet attrs) {
return
new
MarginLayoutParams(getContext(), attrs);
}
}
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