package com.wm.remusic.widget;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;
import com.wm.remusic.R;
public class SideBar extends View {
// 触摸事件
private OnTouchingLetterChangedListener onTouchingLetterChangedListener;
// 26个字母
public static String[] b = {"A", "B", "C", "D", "E", "F", "G", "H", "I",
"J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
"W", "X", "Y", "Z", "#"};
private int choose = -1;// 选中
private Paint paint = new Paint();
private TextView mTextDialog;
public void setView(TextView mTextDialog) {
this.mTextDialog = mTextDialog;
}
public SideBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public SideBar(Context context, AttributeSet attrs) {
super(context, attrs);
setBackgroundResource(R.drawable.search_indexbar_bg_prs);
}
public SideBar(Context context) {
super(context);
}
/**
* 重写这个方法
*/
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
this.removeCallbacks(runnable);
// 获取焦点改变背景颜色.
int height = getHeight();// 获取对应高度
int width = getWidth(); // 获取对应宽度
int singleHeight = height / b.length;// 获取每一个字母的高度
for (int i = 0; i < b.length; i++) {
//paint.setColor(Color.argb(66, 0, 0, 0));
paint.setColor(Color.WHITE);
paint.setTypeface(Typeface.SANS_SERIF);
paint.setAntiAlias(true);
paint.setTextSize(30);
// 选中的状态
if (i == choose) {
paint.setColor(Color.WHITE);
paint.setFakeBoldText(true);
}
// x坐标等于中间-字符串宽度的一半.
float xPos = width / 2 - paint.measureText(b[i]) / 2;
float yPos = singleHeight * i + singleHeight;
canvas.drawText(b[i], xPos, yPos, paint);
paint.reset();// 重置画笔
}
this.postDelayed(runnable, 2000);
}
private Runnable runnable = new Runnable() {
@Override
public void run() {
SideBar.this.setVisibility(INVISIBLE);
}
};
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
final int action = event.getAction();
final float y = event.getY();// 点击y坐标
final int oldChoose = choose;
final OnTouchingLetterChangedListener listener = onTouchingLetterChangedListener;
final int c = (int) (y / getHeight() * b.length);// 点击y坐标所占总高度的比例*b数组的长度就等于点击b中的个数.
switch (action) {
case MotionEvent.ACTION_UP:
choose = -1;//
invalidate();
if (mTextDialog != null) {
mTextDialog.setVisibility(View.INVISIBLE);
}
// this.postDelayed(runnable,2000);
break;
case MotionEvent.ACTION_DOWN:
this.removeCallbacks(runnable);
SideBar.this.setVisibility(VISIBLE);
break;
default:
//setBackgroundResource(R.drawable.sort_listview_sidebar_background);
if (oldChoose != c) {
if (c >= 0 && c < b.length) {
if (listener != null) {
listener.onTouchingLetterChanged(b[c]);
}
if (mTextDialog != null) {
mTextDialog.setText(b[c]);
mTextDialog.setVisibility(View.VISIBLE);//这里是指的在屏幕中央显示当前点击的一个A,B,C,D...的一个状态显示。
}
choose = c;
invalidate();
}
}
break;
}
return true;
}
/**
* 向外公开的方法
*
* @param onTouchingLetterChangedListener
*/
public void setOnTouchingLetterChangedListener(
OnTouchingLetterChangedListener onTouchingLetterChangedListener) {
this.onTouchingLetterChangedListener = onTouchingLetterChangedListener;
}
/**
* 接口
*
* @author coder
*/
public interface OnTouchingLetterChangedListener {
void onTouchingLetterChanged(String s);
}
public void setSelected(String nowChar) {
Log.i("OnRecyclerViewOnScrol", "setSelected:" + nowChar);
if (nowChar != null) {
for (int i = 0; i < b.length; i++) {
if (b[i].equals(nowChar)) {
choose = i;
break;
}
if (i == b.length - 1) {
choose = -1;
}
}
invalidate();//刷新整个view
}
}
}