package com.silencedut.knowweather.common.customview;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;
import com.silencedut.knowweather.R;
/**
* Created by SilenceDut on 16/10/18.
*/
public class SideLetterBar extends View {
private static final String[] INITIAL = {"定位", "热门", "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;
private Paint paint = new Paint();
private OnLetterChangedListener onLetterChangedListener;
private TextView overlay;
public SideLetterBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public SideLetterBar(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SideLetterBar(Context context) {
super(context);
}
public void setOverlay(TextView overlay) {
this.overlay = overlay;
}
@SuppressWarnings("deprecation")
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(Color.TRANSPARENT);
int height = getHeight();
int width = getWidth();
int singleHeight = height / INITIAL.length;
for (int i = 0; i < INITIAL.length; i++) {
paint.setTextSize(getResources().getDimension(R.dimen.text_size_small));
paint.setColor(getResources().getColor(R.color.colorAccent));
paint.setAntiAlias(true);
float xPos = width / 2 - paint.measureText(INITIAL[i]) / 2;
float yPos = singleHeight * i + singleHeight;
canvas.drawText(INITIAL[i], xPos, yPos, paint);
paint.reset();
}
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
final int action = event.getAction();
final float y = event.getY();
final int oldChoose = choose;
final OnLetterChangedListener listener = onLetterChangedListener;
final int c = (int) (y / getHeight() * INITIAL.length);
switch (action) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
if (oldChoose != c && listener != null) {
if (c >= 0 && c < INITIAL.length) {
choose = c;
invalidate();
if (overlay != null) {
overlay.setVisibility(VISIBLE);
String letter = INITIAL[c];
if (!(c == 0 || c == 1 || letter.equals("O") || letter.equals("U") || letter.equals("V"))) {
listener.onLetterChanged(INITIAL[c]);
overlay.setText(INITIAL[c]);
}
}
}
}
break;
case MotionEvent.ACTION_UP:
choose = -1;
invalidate();
if (overlay != null) {
overlay.setVisibility(GONE);
}
break;
}
return true;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return super.onTouchEvent(event);
}
public void setOnLetterChangedListener(OnLetterChangedListener onLetterChangedListener) {
this.onLetterChangedListener = onLetterChangedListener;
}
public interface OnLetterChangedListener {
void onLetterChanged(String letter);
}
}