package com.admin.sole.raiskid.view;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import com.admin.sole.raiskid.utils.CustomLog;
import java.util.ArrayList;
import java.util.List;
public class FlowLayout extends ViewGroup {
private static final String TAG = "FlowLayout";
public FlowLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected ViewGroup.LayoutParams generateLayoutParams(
ViewGroup.LayoutParams p) {
return new MarginLayoutParams(p);
}
@Override
public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
return new MarginLayoutParams(getContext(), attrs);
}
@Override
protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
return new MarginLayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT);
}
/**
* 负责设置子控件的测量模式和大小 根据所有子控件设置自己的宽和高
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
// 获得它的父容器为它设置的测量模式和大小
final int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
final int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
final int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
final int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
CustomLog.e(TAG, sizeWidth + "," + sizeHeight);
// 如果是warp_content情况下,记录宽和高
int width = 0;
int height = 0;
/**
* 记录每一行的宽度,width不断取最大宽度
*/
int lineWidth = 0;
/**
* 每一行的高度,累加至height
*/
int lineHeight = 0;
final int cCount = getChildCount();
// 遍历每个子元素
for (int i = 0; i < cCount; i++) {
final View child = getChildAt(i);
// 测量每一个child的宽和高
measureChild(child, widthMeasureSpec, heightMeasureSpec);
// 得到child的lp
final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
// 当前子空间实际占据的宽度
final int childWidth = child.getMeasuredWidth() + lp.leftMargin
+ lp.rightMargin;
// 当前子空间实际占据的高度
final int childHeight = child.getMeasuredHeight() + lp.topMargin
+ lp.bottomMargin;
/**
* 如果加入当前child,则超出最大宽度,则的到目前最大宽度给width,类加height 然后开启新行
*/
if (lineWidth + childWidth > sizeWidth) {
width = Math.max(lineWidth, childWidth);
// 取最大的
lineWidth = childWidth;
// 重新开启新行,开始记录
// 叠加当前高度,
height += lineHeight;
// 开启记录下一行的高度
lineHeight = childHeight;
} else
// 否则累加值lineWidth,lineHeight取最大高度
{
lineWidth += childWidth;
lineHeight = Math.max(lineHeight, childHeight);
}
// 如果是最后一个,则将当前记录的最大宽度和当前lineWidth做比较
if (i == cCount - 1) {
width = Math.max(width, line
Width);
height += lineHeight; }
}
setMeasuredDimension((modeWidth == MeasureSpec.EXACTLY) ? sizeWidth
: width, (modeHeight == MeasureSpec.EXACTLY) ? sizeHeight
: height);
}
/** * 存储所有的View,按行记录 */
private List<List<View>> mAllViews = new ArrayList<>();
/** * 记录每一行的最大高度 */
private List<Integer> mLineHeight = new ArrayList<>();
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mAllViews.clear(); mLineHeight.clear(); int width = getWidth(); int lineWidth = 0; int lineHeight = 0;
// 存储每一行所有的childView
List<View> lineViews = new ArrayList<>();
final int cCount = getChildCount();
// 遍历所有的孩子
for (int i = 0; i < cCount; i++) {
final View child = getChildAt(i);
MarginLayoutParams lp = (MarginLayoutParams) child
.getLayoutParams();
final int childWidth = child.getMeasuredWidth();
final int childHeight = child.getMeasuredHeight();
// 如果已经需要换行
if (childWidth + lp.leftMargin + lp.rightMargin + lineWidth > width) {
// 记录这一行所有的View以及最大高度
mLineHeight.add(lineHeight);
// 将当前行的childView保存,然后开启新的ArrayList保存下一行的childView
mAllViews.add(lineViews);
lineWidth = 0;// 重置行宽
lineViews = new ArrayList<>(); }
/** * 如果不需要换行,则累加 */
lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
lineHeight = Math.max(lineHeight, childHeight + lp.topMargin
+ lp.bottom
Margin); lineViews.add(child); }
// 记录最后一行
mLineHeight.add(lineHeight); mAllViews.add(lineViews); int left = 0; int top = 0;
// 得到总行数
final int lineNums = mAllViews.size();
for (int i = 0; i < lineNums; i++) { // 每一行的所有的views
lineViews = mAllViews.get(i); // 当前行的最大高度
lineHeight = mLineHeight.get(i);
CustomLog.e(TAG, "第" + i + "行 :" + lineViews.size() + " , " + lineViews);
CustomLog.e(TAG, "第" + i + "行, :" + lineHeight); // 遍历当前行所有的View
for (int j = 0; j < lineViews.size(); j++) {
final View child = lineViews.get(j);
if (child.getVisibility() == View.GONE) { continue; }
final MarginLayoutParams lp = (MarginLayoutParams) child
.getLayoutParams();
// 计算childView的left,top,right,bottom
final int lc = left + lp.leftMargin;
final int tc = top + lp.topMargin;
final int rc = lc + child.getMeasuredWidth();
final int bc = tc + child.getMeasuredHeight();
CustomLog.e(TAG, child + " , l = " + lc + " , t = " + t + " , r ="
+ rc + " , b = " + bc);
child.layout(lc, tc, rc, bc);
left += child.getMeasuredWidth() + lp.rightMargin
+ lp.leftMargin; }
left = 0;
top += lineHeight;
}
}}