package com.sahooz.library.countrypicker;
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import android.annotation.SuppressLint;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import androidx.annotation.Nullable;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.View;
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import java.util.ArrayList;
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import java.util.Arrays;
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/**
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* Created by android on 3/14/2018.
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*/
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public class SideBar extends View {
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public final ArrayList<String> indexes = new ArrayList<>();
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private OnLetterChangeListener onLetterChangeListener;
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private Paint paint;
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private float textHeight;
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private int cellWidth;
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private int cellHeight;
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private int currentIndex = -1;
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private int letterColor;
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private int selectColor;
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private int letterSize;
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public SideBar(Context context) { this(context, null); }
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public SideBar(Context context, @Nullable AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public SideBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.SideBar, defStyleAttr, 0);
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letterColor = ta.getColor(R.styleable.SideBar_letterColor, Color.BLACK);
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selectColor = ta.getColor(R.styleable.SideBar_selectColor, Color.CYAN);
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letterSize = ta.getDimensionPixelSize(R.styleable.SideBar_letterSize, 24);
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ta.recycle();
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paint = new Paint();
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//消除锯齿
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paint.setAntiAlias(true);
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Paint.FontMetrics fontMetrics = paint.getFontMetrics();
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textHeight = (float) Math.ceil(fontMetrics.descent - fontMetrics.ascent); //1.1---2 2.1--3
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String[] letters = {"A", "B", "C", "D",
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"E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q",
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"R", "S", "T", "U", "V", "W", "X", "Y", "Z"};
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indexes.addAll(Arrays.asList(letters));
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}
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public void addIndex(String indexStr, int position) {
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indexes.add(position, indexStr);
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invalidate();
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}
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public void removeIndex(String indexStr) {
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indexes.remove(indexStr);
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invalidate();
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}
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public void setLetterSize(int letterSize) {
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if(this.letterSize == letterSize) return;
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this.letterSize = letterSize;
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invalidate();
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}
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@Override
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protected void onSizeChanged(int w, int h, int oldw, int oldh) {
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super.onSizeChanged(w, h, oldw, oldh);
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cellWidth = getMeasuredWidth();
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cellHeight = getMeasuredHeight() / indexes.size();
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}
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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paint.setTextSize(letterSize);
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for (int i = 0; i < indexes.size(); i++) {
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String letter = indexes.get(i);
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float textWidth = paint.measureText(letter);
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float x = (cellWidth - textWidth) * 0.5f;
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float y = (cellHeight + textHeight) * 0.5f + cellHeight * i;
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if (i == currentIndex) {
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paint.setColor(selectColor);
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} else {
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paint.setColor(letterColor);
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}
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canvas.drawText(letter, x, y, paint);
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}
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}
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public OnLetterChangeListener getOnLetterChangeListener() {
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return onLetterChangeListener;
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}
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public void setOnLetterChangeListener(OnLetterChangeListener onLetterChangeListener) {
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this.onLetterChangeListener = onLetterChangeListener;
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}
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public String getLetter(int position) {
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if(position < 0 || position >= indexes.size()) return "";
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return indexes.get(position);
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}
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public interface OnLetterChangeListener {
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void onLetterChange(String letter);
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//手指抬起
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void onReset();
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}
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/**
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* 处理 按下 移动 手指抬起
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*/
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@SuppressLint("ClickableViewAccessibility")
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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switch (event.getAction()) {
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case MotionEvent.ACTION_DOWN:
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case MotionEvent.ACTION_MOVE:
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int downY = (int) event.getY();
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//获取当前索引
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currentIndex = downY / cellHeight;
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if (currentIndex < 0 || currentIndex > indexes.size() - 1) {
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} else {
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if (onLetterChangeListener != null) {
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onLetterChangeListener.onLetterChange(indexes.get(currentIndex));
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}
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}
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//重新绘制
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invalidate();
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break;
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case MotionEvent.ACTION_UP:
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currentIndex = -1;
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//手动刷新
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invalidate();
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//表示手指抬起了
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if (onLetterChangeListener != null) {
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onLetterChangeListener.onReset();
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}
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break;
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}
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// 为了 能够接受 move+up事件
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return true;
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}
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}
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