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package com.junyun.tinystore.widget;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

import com.junyun.tinystore.R;

/**
 * Created by cchao on 2016/7/1.
 * E-mail:   cchao1024@163.com
 * Description: 流式 布局
 */
public class FlowLayout extends ViewGroup {

        private static final int DEFAULT_HORIZONTAL_SPACING = 5;
        private static final int DEFAULT_VERTICAL_SPACING = 5;

        private int mVerticalSpacing;
        private int mHorizontalSpacing;

        public FlowLayout ( Context context ) {
                super ( context );
        }

        public FlowLayout ( Context context, AttributeSet attrs ) {
                super ( context, attrs );

                TypedArray a = context.obtainStyledAttributes ( attrs, R.styleable.FlowLayout );
                try {
                        mHorizontalSpacing = a.getDimensionPixelSize (
                                R.styleable.FlowLayout_horizontal_spacing, DEFAULT_HORIZONTAL_SPACING );
                        mVerticalSpacing = a.getDimensionPixelSize (
                                R.styleable.FlowLayout_vertical_spacing, DEFAULT_VERTICAL_SPACING );
                } finally {
                        a.recycle ( );
                }
        }


        public void setHorizontalSpacing ( int pixelSize ) {
                mHorizontalSpacing = pixelSize;
        }

        public void setVerticalSpacing ( int pixelSize ) {
                mVerticalSpacing = pixelSize;
        }

        @Override
        protected void onMeasure ( int widthMeasureSpec, int heightMeasureSpec ) {
                int myWidth = resolveSize ( 0, widthMeasureSpec );

                int paddingLeft = getPaddingLeft ( );
                int paddingTop = getPaddingTop ( );
                int paddingRight = getPaddingRight ( );
                int paddingBottom = getPaddingBottom ( );

                int childLeft = paddingLeft;
                int childTop = paddingTop;

                int lineHeight = 0;

                // Measure each child and put the child to the right of previous child
                // if there's enough room for it, otherwise, wrap the line and put the child to next line.
                for ( int i = 0, childCount = getChildCount ( ) ; i < childCount ; ++ i ) {
                        View child = getChildAt ( i );
                        if ( child.getVisibility ( ) != View.GONE ) {
                                measureChild ( child, widthMeasureSpec, heightMeasureSpec );
                        } else {
                                continue;
                        }

                        int childWidth = child.getMeasuredWidth ( );
                        int childHeight = child.getMeasuredHeight ( );

                        lineHeight = Math.max ( childHeight, lineHeight );

                        if ( childLeft + childWidth + paddingRight > myWidth ) {
                                childLeft = paddingLeft;
                                childTop += mVerticalSpacing + lineHeight;
                                lineHeight = childHeight;
                        } else {
                                childLeft += childWidth + mHorizontalSpacing;
                        }
                }

                int wantedHeight = childTop + lineHeight + paddingBottom;

                setMeasuredDimension ( myWidth, resolveSize ( wantedHeight, heightMeasureSpec ) );
        }

        @Override
        protected void onLayout ( boolean changed, int l, int t, int r, int b ) {
                int myWidth = r - l;

                int paddingLeft = getPaddingLeft ( );
                int paddingTop = getPaddingTop ( );
                int paddingRight = getPaddingRight ( );

                int childLeft = paddingLeft;
                int childTop = paddingTop;

                int lineHeight = 0;

                for ( int i = 0, childCount = getChildCount ( ) ; i < childCount ; ++ i ) {
                        View childView = getChildAt ( i );

                        if ( childView.getVisibility ( ) == View.GONE ) {
                                continue;
                        }

                        int childWidth = childView.getMeasuredWidth ( );
                        int childHeight = childView.getMeasuredHeight ( );

                        lineHeight = Math.max ( childHeight, lineHeight );

                        if ( childLeft + childWidth + paddingRight > myWidth ) {
                                childLeft = paddingLeft;
                                childTop += mVerticalSpacing + lineHeight;
                                lineHeight = childHeight;
                        }

                        childView.layout ( childLeft, childTop, childLeft + childWidth, childTop + childHeight );
                        childLeft += childWidth + mHorizontalSpacing;
                }
        }
}
/*
<com.junyun.tinystore.widget.FlowLayout

        android：id ="@+id/flow_layout"
        android：layout_width ="match_parent"
        android：layout_height ="wrap_content"
        android：numColumns ="auto_fit"
        flowlayout：horizontal_spacing ="24dp"
        flowlayout：vertical_spacing ="20dp"/>

 */