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