97 lines
3.1 KiB
Java
97 lines
3.1 KiB
Java
/*
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* Copyright 2016 Hippo Seven
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.hippo.widget;
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import android.content.Context;
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import android.util.AttributeSet;
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public class SimpleGridAutoSpanLayout extends SimpleGridLayout {
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public static final int STRATEGY_MIN_SIZE = 0;
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public static final int STRATEGY_SUITABLE_SIZE = 1;
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private int mColumnSize = -1;
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private boolean mColumnSizeChanged = true;
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private int mStrategy;
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public SimpleGridAutoSpanLayout(Context context) {
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super(context);
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}
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public SimpleGridAutoSpanLayout(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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public SimpleGridAutoSpanLayout(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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}
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public static int getSpanCountForSuitableSize(int total, int single) {
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int span = total / single;
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if (span <= 0) {
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return 1;
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}
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int span2 = span + 1;
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float deviation = Math.abs(1 - (total / span / (float) single));
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float deviation2 = Math.abs(1 - (total / span2 / (float) single));
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return deviation < deviation2 ? span : span2;
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}
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public static int getSpanCountForMinSize(int total, int single) {
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return Math.max(1, total / single);
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}
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public void setColumnSize(int columnSize) {
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if (columnSize == mColumnSize) {
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return;
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}
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mColumnSize = columnSize;
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mColumnSizeChanged = true;
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}
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public void setStrategy(int strategy) {
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if (strategy == mStrategy) {
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return;
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}
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mStrategy = strategy;
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mColumnSizeChanged = true;
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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 widthMode = MeasureSpec.getMode(widthMeasureSpec);
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int widthSize = MeasureSpec.getSize(widthMeasureSpec);
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if (mColumnSizeChanged && mColumnSize > 0 && widthMode == MeasureSpec.EXACTLY) {
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int totalSpace = widthSize - getPaddingRight() - getPaddingLeft();
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int spanCount;
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switch (mStrategy) {
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default:
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case STRATEGY_MIN_SIZE:
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spanCount = getSpanCountForMinSize(totalSpace, mColumnSize);
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break;
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case STRATEGY_SUITABLE_SIZE:
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spanCount = getSpanCountForSuitableSize(totalSpace, mColumnSize);
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break;
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}
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setColumnCount(spanCount);
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mColumnSizeChanged = false;
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}
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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}
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}
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