kopia lustrzana https://github.com/N0BOY/FT8CN
125 wiersze
5.1 KiB
Java
125 wiersze
5.1 KiB
Java
package com.bg7yoz.ft8cn.ui;
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/**
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* 用于可以自动换行的RadioGroup控件
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* 原生RadioGroup控件在布局不够宽度时，无法把RadioButton自动换行，此控件可以自动换行
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* @author BGY70Z
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* @date 2023-08-30
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*/
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.View;
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import android.widget.RadioGroup;
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public class RadioGroupFt8cn extends RadioGroup {
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public RadioGroupFt8cn(Context context) {
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super(context);
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}
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public RadioGroupFt8cn(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 void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int widthSize = MeasureSpec.getSize(widthMeasureSpec);
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int widthMode = MeasureSpec.getMode(widthMeasureSpec);
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int heightSize = MeasureSpec.getSize(heightMeasureSpec);
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int heightMode = MeasureSpec.getMode(heightMeasureSpec);
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//调用ViewGroup的方法，测量子view
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measureChildren(widthMeasureSpec, heightMeasureSpec);
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//最大的宽
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int maxWidth = 0;
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//累计的高
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int totalHeight = 0;
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//当前这一行的累计行宽
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int lineWidth = 0;
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//当前这行的最大行高
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int maxLineHeight = 0;
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//用于记录换行前的行宽和行高
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int oldHeight;
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int oldWidth;
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int count = getChildCount();
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//假设 widthMode和heightMode都是AT_MOST
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for (int i = 0; i < count; i++) {
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View child = getChildAt(i);
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MarginLayoutParams params = (MarginLayoutParams) child.getLayoutParams();
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//得到这一行的最高
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oldHeight = maxLineHeight;
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//当前最大宽度
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oldWidth = maxWidth;
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int deltaX = child.getMeasuredWidth() + params.leftMargin + params.rightMargin;
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if (lineWidth + deltaX + getPaddingLeft() + getPaddingRight() > widthSize) {//如果折行,height增加
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//和目前最大的宽度比较,得到最宽。不能加上当前的child的宽,所以用的是oldWidth
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maxWidth = Math.max(lineWidth, oldWidth);
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//重置宽度
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lineWidth = deltaX;
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//累加高度
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totalHeight += oldHeight;
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//重置行高,当前这个View，属于下一行，因此当前最大行高为这个child的高度加上margin
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maxLineHeight = child.getMeasuredHeight() + params.topMargin + params.bottomMargin;
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} else {
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//不换行，累加宽度
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lineWidth += deltaX;
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//不换行，计算行最高
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int deltaY = child.getMeasuredHeight() + params.topMargin + params.bottomMargin;
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maxLineHeight = Math.max(maxLineHeight, deltaY);
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}
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if (i == count - 1) {
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//前面没有加上下一行的搞，如果是最后一行，还要再叠加上最后一行的最高的值
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totalHeight += maxLineHeight;
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//计算最后一行和前面的最宽的一行比较
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maxWidth = Math.max(lineWidth, oldWidth);
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}
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}
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//加上当前容器的padding值
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maxWidth += getPaddingLeft() + getPaddingRight();
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totalHeight += getPaddingTop() + getPaddingBottom();
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setMeasuredDimension(widthMode == MeasureSpec.EXACTLY ? widthSize : maxWidth,
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heightMode == MeasureSpec.EXACTLY ? heightSize : totalHeight);
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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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int count = getChildCount();
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//pre为前面所有的child的相加后的位置
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int preLeft = getPaddingLeft();
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int preTop = getPaddingTop();
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//记录每一行的最高值
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int maxHeight = 0;
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for (int i = 0; i < count; i++) {
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View child = getChildAt(i);
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MarginLayoutParams params = (MarginLayoutParams) child.getLayoutParams();
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//r-l为当前容器的宽度。如果子view的累积宽度大于容器宽度，就换行。
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if (preLeft + params.leftMargin + child.getMeasuredWidth() + params.rightMargin + getPaddingRight() > (r - l)) {
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//重置
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preLeft = getPaddingLeft();
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//要选择child的height最大的作为设置
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preTop = preTop + maxHeight;
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maxHeight = getChildAt(i).getMeasuredHeight() + params.topMargin + params.bottomMargin;
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} else { //不换行,计算最大高度
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maxHeight = Math.max(maxHeight, child.getMeasuredHeight() + params.topMargin + params.bottomMargin);
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}
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//left坐标
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int left = preLeft + params.leftMargin;
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//top坐标
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int top = preTop + params.topMargin;
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int right = left + child.getMeasuredWidth();
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int bottom = top + child.getMeasuredHeight();
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//为子view布局
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child.layout(left, top, right, bottom);
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//计算布局结束后，preLeft的值
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preLeft += params.leftMargin + child.getMeasuredWidth() + params.rightMargin;
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}
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}
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} |