父容器调用getChildMeasureSpec的时候传入的第二个参数好像不止是子view的p
/**
* Ask one of the children of this view to measure itself, taking into
* account both the MeasureSpec requirements for this view and its padding
* and margins. The child must have MarginLayoutParams The heavy lifting is
* done in getChildMeasureSpec.
*
* @param child The child to measure
* @param parentWidthMeasureSpec The width requirements for this view
* @param widthUsed Extra space that has been used up by the parent
* horizontally (possibly by other children of the parent)
* @param parentHeightMeasureSpec The height requirements for this view
* @param heightUsed Extra space that has been used up by the parent
* vertically (possibly by other children of the parent)
*/
protected void measureChildWithMargins(View child,
int parentWidthMeasureSpec, int widthUsed,
int parentHeightMeasureSpec, int heightUsed) {
// 1 类型转换
final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
// 2 getChildMeasureSpec方法
final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec,
mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin
+ widthUsed, lp.width);
final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec,
mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin
+ heightUsed, lp.height);
child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
}
/**
* @param spec 父View的详细测量值（MeasureSpec）
* @param padding 子view内外边距
*@param childDimension 子view预定的大小(LayoutParam.width或height)---最终不一定绘制该大小
*子布局大小需要由自身的layoutPrams属性和父View的MeasureSpec共同决定
*/
ViewGroup.getChildMeasureSpec(int spec, int padding, int childDimension); |
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