Android/.svn/pristine/fe/fe97db514b1218a0d1fdd0a910354dd8aec75c21.svn-base

package eVVM.apk.widget;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;


import java.util.ArrayList;
import java.util.List;

import eVVM.apk.R;

public class LineBreakLayout extends ViewGroup {
    private final static String TAG = "LineBreakLayout";
    /**
     * 所有标签
     */
    private List<String> lables;
    /**
     * 选中标签
     */
    private List<String> lableSelected = new ArrayList<>();

    //自定义属性
    private int LEFT_RIGHT_SPACE; //dip
    private int ROW_SPACE;

    public LineBreakLayout(Context context) {
        this(context, null);
    }
    public LineBreakLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }
    public LineBreakLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.LineBreakLayout);
        LEFT_RIGHT_SPACE = ta.getDimensionPixelSize(R.styleable.LineBreakLayout_leftAndRightSpace, 10);
        ROW_SPACE = ta.getDimensionPixelSize(R.styleable.LineBreakLayout_rowSpace, 10);
        ta.recycle(); //回收
        // ROW_SPACE=20   LEFT_RIGHT_SPACE=40
        Log.v(TAG, "ROW_SPACE="+ROW_SPACE+"   LEFT_RIGHT_SPACE="+LEFT_RIGHT_SPACE);
    }

    /**
     * 添加标签
     * @param lables 标签集合
     * @param add 是否追加
     */
    public void setLables(List<String> lables, boolean add){
        if(this.lables == null){
            this.lables = new ArrayList<>();
        }
        if(add){
            this.lables.addAll(lables);
        }else{
            this.lables.clear();
            this.lables = lables;
        }
        if(lables!=null && lables.size()>0){
            LayoutInflater inflater = LayoutInflater.from(getContext());
            for (final String lable : lables) {
                //获取标签布局
                final TextView tv = (TextView) inflater.inflate(R.layout.likes_item_lable, null);
                tv.setText(lable);
                //设置选中效果
                if (lableSelected.contains(lable)) {
                    //选中
                    tv.setSelected(true);
                    tv.setTextColor(getResources().getColor(R.color.white));
                } else {
                    //未选中
                    tv.setSelected(false);
                    tv.setTextColor(getResources().getColor(R.color.black));
                }
                //点击标签后，重置选中效果
                tv.setOnClickListener(new OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        tv.setSelected(tv.isSelected() ? false : true);
                        if (tv.isSelected()) {
                            tv.setTextColor(getResources().getColor(R.color.white));
                            //将选中的标签加入到lableSelected中
                            lableSelected.add(lable);
                        } else {
                            tv.setTextColor(getResources().getColor(R.color.black));
                            lableSelected.remove(lable);
                        }
                    }
                });
                //将标签添加到容器中
                addView(tv);
            }
        }
    }

    /**
     * 获取选中标签
     */
    public List<String> getSelectedLables(){
        return lableSelected;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        //为所有的标签childView计算宽和高
        measureChildren(widthMeasureSpec, heightMeasureSpec);

        //获取高的模式
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        //建议的高度
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);
        //布局的宽度采用建议宽度（match_parent或者size），如果设置wrap_content也是match_parent的效果
        int width = MeasureSpec.getSize(widthMeasureSpec);

        int height ;
        if (heightMode == MeasureSpec.EXACTLY) {
            //如果高度模式为EXACTLY（match_perent或者size），则使用建议高度
            height = heightSize;
        } else {
            //其他情况下（AT_MOST、UNSPECIFIED）需要计算计算高度
            int childCount = getChildCount();
            if(childCount<=0){
                height = 0;   //没有标签时，高度为0
            }else{
                int row = 1;  // 标签行数
                int widthSpace = width;// 当前行右侧剩余的宽度
                for(int i = 0;i<childCount; i++){
                    View view = getChildAt(i);
                    //获取标签宽度
                    int childW = view.getMeasuredWidth();
                    Log.v(TAG , "标签宽度:"+childW +" 行数："+row+"  剩余宽度："+widthSpace);
                    if(widthSpace >= childW ){
                        //如果剩余的宽度大于此标签的宽度，那就将此标签放到本行
                        widthSpace -= childW;
                    }else{
                        row ++;    //增加一行
                        //如果剩余的宽度不能摆放此标签，那就将此标签放入一行
                        widthSpace = width-childW;
                    }
                    //减去标签左右间距
                    widthSpace -= LEFT_RIGHT_SPACE;
                }
                //由于每个标签的高度是相同的，所以直接获取第一个标签的高度即可
                int childH = getChildAt(0).getMeasuredHeight();
                //最终布局的高度=标签高度*行数+行距*(行数-1)
                height = (childH * row) + ROW_SPACE * (row-1);

                Log.v(TAG , "总高度:"+height +" 行数："+row+"  标签高度："+childH);
            }
        }

        //设置测量宽度和测量高度
        setMeasuredDimension(width, height);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int row = 0;
        int right = 0;   // 标签相对于布局的右侧位置
        int botom;       // 标签相对于布局的底部位置
        for (int i = 0; i < getChildCount(); i++) {
            View childView = getChildAt(i);
            int childW = childView.getMeasuredWidth();
            int childH = childView.getMeasuredHeight();
            //右侧位置=本行已经占有的位置+当前标签的宽度
            right += childW;
            //底部位置=已经摆放的行数*（标签高度+行距）+当前标签高度
            botom = row * (childH + ROW_SPACE) + childH;
            // 如果右侧位置已经超出布局右边缘，跳到下一行
            // if it can't drawing on a same line , skip to next line
            if (right > (r - LEFT_RIGHT_SPACE)){
                row++;
                right = childW;
                botom = row * (childH + ROW_SPACE) + childH;
            }
            Log.d(TAG, "left = " + (right - childW) +" top = " + (botom - childH)+
                    " right = " + right + " botom = " + botom);
            childView.layout(right - childW, botom - childH,right,botom);

            right += LEFT_RIGHT_SPACE;
        }
    }

}