package com.doumee.lib_coremodel.view.flowlayout;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.util.AttributeSet;
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import android.view.View;
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import android.view.ViewGroup;
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import com.doumee.lib_coremodel.R;
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import java.util.ArrayList;
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import java.util.List;
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public class FlowLayout extends ViewGroup {
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private static final String TAG = "FlowLayout";
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private static final int LEFT = -1;
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private static final int CENTER = 0;
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private static final int RIGHT = 1;
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protected List<List<View>> mAllViews = new ArrayList<List<View>>();
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protected List<Integer> mLineHeight = new ArrayList<Integer>();
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protected List<Integer> mLineWidth = new ArrayList<Integer>();
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private int mGravity;
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private List<View> lineViews = new ArrayList<>();
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public FlowLayout(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.TagFlowLayout);
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mGravity = ta.getInt(R.styleable.TagFlowLayout_gravity, LEFT);
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ta.recycle();
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}
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public FlowLayout(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public FlowLayout(Context context) {
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this(context, null);
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
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int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
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int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
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int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
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// wrap_content
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int width = 0;
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int height = 0;
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int lineWidth = 0;
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int lineHeight = 0;
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int cCount = getChildCount();
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for (int i = 0; i < cCount; i++) {
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View child = getChildAt(i);
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if (child.getVisibility() == View.GONE) {
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if (i == cCount - 1) {
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width = Math.max(lineWidth, width);
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height += lineHeight;
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}
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continue;
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}
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measureChild(child, widthMeasureSpec, heightMeasureSpec);
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MarginLayoutParams lp = (MarginLayoutParams) child
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.getLayoutParams();
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int childWidth = child.getMeasuredWidth() + lp.leftMargin
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+ lp.rightMargin;
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int childHeight = child.getMeasuredHeight() + lp.topMargin
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+ lp.bottomMargin;
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if (lineWidth + childWidth > sizeWidth - getPaddingLeft() - getPaddingRight()) {
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width = Math.max(width, lineWidth);
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lineWidth = childWidth;
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height += lineHeight;
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lineHeight = childHeight;
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} else {
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lineWidth += childWidth;
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lineHeight = Math.max(lineHeight, childHeight);
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}
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if (i == cCount - 1) {
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width = Math.max(lineWidth, width);
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height += lineHeight;
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}
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}
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setMeasuredDimension(
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//
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modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width + getPaddingLeft() + getPaddingRight(),
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modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height + getPaddingTop() + getPaddingBottom()//
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);
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}
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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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mLineWidth.clear();
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lineViews.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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int cCount = getChildCount();
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for (int i = 0; i < cCount; i++) {
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View child = getChildAt(i);
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if (child.getVisibility() == View.GONE) continue;
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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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if (childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width - getPaddingLeft() - getPaddingRight()) {
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mLineHeight.add(lineHeight);
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mAllViews.add(lineViews);
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mLineWidth.add(lineWidth);
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lineWidth = 0;
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lineHeight = childHeight + lp.topMargin + lp.bottomMargin;
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lineViews = new ArrayList<View>();
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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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mLineHeight.add(lineHeight);
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mLineWidth.add(lineWidth);
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mAllViews.add(lineViews);
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int left = getPaddingLeft();
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int top = getPaddingTop();
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int lineNum = mAllViews.size();
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for (int i = 0; i < lineNum; i++) {
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lineViews = mAllViews.get(i);
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lineHeight = mLineHeight.get(i);
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// set gravity
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int currentLineWidth = this.mLineWidth.get(i);
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switch (this.mGravity) {
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case LEFT:
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left = getPaddingLeft();
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break;
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case CENTER:
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left = (width - currentLineWidth) / 2 + getPaddingLeft();
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break;
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case RIGHT:
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left = width - currentLineWidth + getPaddingLeft();
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break;
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}
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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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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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child.layout(lc, tc, rc, bc);
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left += child.getMeasuredWidth() + lp.leftMargin
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+ lp.rightMargin;
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}
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top += lineHeight;
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}
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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.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
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}
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@Override
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protected LayoutParams generateLayoutParams(LayoutParams p) {
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return new MarginLayoutParams(p);
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}
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}
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