package com.dreamspace.uucampus.widget;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Shader.TileMode;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import com.dreamspace.uucampus.R;
import java.util.ArrayList;
/**
* WheelView滚轮
*
* @author JiangPing
*/
public class WheelView extends View {
/**
* 控件宽度
*/
private float controlWidth;
/**
* 控件高度
*/
private float controlHeight;
/**
* 是否滑动中
*/
private boolean isScrolling = false;
/**
* 选择的内容
*/
private ArrayList<ItemObject> itemList = new ArrayList<>();
/**
* 设置数据
*/
private ArrayList<String> dataList = new ArrayList<>();
/**
* 按下的坐标
*/
private int downY;
/**
* 按下的时间
*/
private long downTime = 0;
/**
* 短促移动
*/
private long goonTime = 200;
/**
* 短促移动距离
*/
private int goonDistence = 100;
/**
* 画线画笔
*/
private Paint linePaint;
/**
* 线的默认颜色
*/
private int lineColor = 0xff000000;
/**
* 线的默认宽度
*/
private float lineWidth = 2f;
/**
* 默认字体
*/
private float normalFont = 14.0f;
/**
* 选中的时候字体
*/
private float selectedFont = 22.0f;
/**
* 单元格高度
*/
private int unitHeight = 50;
/**
* 显示多少个内容
*/
private int itemNumber = 7;
/**
* 默认字体颜色
*/
private int normalColor = 0xff000000;
/**
* 选中时候的字体颜色
*/
private int selectedColor = 0xffff0000;
/**
* 蒙板高度
*/
private float maskHight = 48.0f;
/**
* 选择监听
*/
private OnSelectListener onSelectListener;
/**
* 是否可用
*/
private boolean isEnable = true;
/**
* 刷新界面
*/
private static final int REFRESH_VIEW = 0x001;
/**
* 移动距离
*/
private static final int MOVE_NUMBER = 5;
/**
* 是否允许选空
*/
private boolean noEmpty = true;
/**
* 正在修改数据，避免ConcurrentModificationException异常
*/
private boolean isClearing = false;
public WheelView(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
init(context, attrs);
initData();
}
public WheelView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
initData();
}
public WheelView(Context context) {
super(context);
initData();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isEnable)
return true;
int y = (int) event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isScrolling = true;
downY = (int) event.getY();
downTime = System.currentTimeMillis();
break;
case MotionEvent.ACTION_MOVE:
actionMove(y - downY);
onSelectListener();
break;
case MotionEvent.ACTION_UP:
int move = Math.abs(y - downY);
// 判断段时间移动的距离
if (System.currentTimeMillis() - downTime < goonTime
&& move > goonDistence) {
goonMove(y - downY);
} else {
actionUp(y - downY);
}
noEmpty();
isScrolling = false;
break;
default:
break;
}
return true;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawLine(canvas);
drawList(canvas);
drawMask(canvas);
}
private synchronized void drawList(Canvas canvas) {
if (isClearing)
return;
try {
for (ItemObject itemObject : itemList) {
itemObject.drawSelf(canvas);
}
} catch (Exception e) {
}
}
@Override
protected void onLayout(boolean changed, int left, int top, int right,
int bottom) {
super.onLayout(changed, left, top, right, bottom);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
controlWidth = getWidth();
if (controlWidth != 0) {
setMeasuredDimension(getWidth(), itemNumber * unitHeight);
controlWidth = getWidth();
}
}
/**
* 继续移动一定距离
*/
private synchronized void goonMove(final int move) {
new Thread(new Runnable() {
@Override
public void run() {
int distence = 0;
while (distence < unitHeight * MOVE_NUMBER) {
try {
Thread.sleep(5);
} catch (InterruptedException e) {
e.printStackTrace();
}
actionThreadMove(move > 0 ? distence : distence * (-1));
distence += 10;
}
actionUp(move > 0 ? distence - 10 : distence * (-1) + 10);
noEmpty();
}
}).start();
}
/**
* 不能为空，必须有选项
*/
private void noEmpty() {
if (!noEmpty)
return;
for (ItemObject item : itemList) {
if (item.isSelected())
return;
}
int move = (int) itemList.get(0).moveToSelected();
if (move < 0) {
defaultMove(move);
} else {
defaultMove((int) itemList.get(itemList.size() - 1)
.moveToSelected());
}
for (ItemObject item : itemList) {
if (item.isSelected()) {
if (onSelectListener != null)
onSelectListener.endSelect(item.id, item.itemText);
break;
}
}
}
/**
* 初始化数据
*/
private void initData() {
isClearing = true;
itemList.clear();
for (int i = 0; i < dataList.size(); i++) {
ItemObject itmItemObject = new ItemObject();
itmItemObject.id = i;
itmItemObject.itemText = dataList.get(i);
itmItemObject.x = 0;
itmItemObject.y = i * unitHeight;
itemList.add(itmItemObject);
}
isClearing = false;
}
/**
* 移动的时候
*
* @param move
*/
private void actionMove(int move) {
for (ItemObject item : itemList) {
item.move(move);
}
invalidate();
}
/**
* 移动，线程中调用
*
* @param move
*/
private void actionThreadMove(int move) {
for (ItemObject item : itemList) {
item.move(move);
}
Message rMessage = new Message();
rMessage.what = REFRESH_VIEW;
handler.sendMessage(rMessage);
}
/**
* 松开的时候
*
* @param move
*/
private void actionUp(int move) {
int newMove = 0;
if (move > 0) {
for (int i = 0; i < itemList.size(); i++) {
if (itemList.get(i).isSelected()) {
newMove = (int) itemList.get(i).moveToSelected();
if (onSelectListener != null)
onSelectListener.endSelect(itemList.get(i).id,
itemList.get(i).itemText);
break;
}
}
} else {
for (int i = itemList.size() - 1; i >= 0; i--) {
if (itemList.get(i).isSelected()) {
newMove = (int) itemList.get(i).moveToSelected();
if (onSelectListener != null)
onSelectListener.endSelect(itemList.get(i).id,
itemList.get(i).itemText);
break;
}
}
}
for (ItemObject item : itemList) {
item.newY(move + 0);
}
slowMove(newMove);
Message rMessage = new Message();
rMessage.what = REFRESH_VIEW;
handler.sendMessage(rMessage);
}
/**
* 缓慢移动
*
* @param move
*/
private synchronized void slowMove(final int move) {
new Thread(new Runnable() {
@Override
public void run() {
// 判断政府
int m = move > 0 ? move : move * (-1);
int i = move > 0 ? 1 : (-1);
// 移动速度
int speed = 1;
while (true) {
m = m - speed;
if (m <= 0) {
for (ItemObject item : itemList) {
item.newY(m * i);
}
Message rMessage = new Message();
rMessage.what = REFRESH_VIEW;
handler.sendMessage(rMessage);
try {
Thread.sleep(2);
} catch (InterruptedException e) {
e.printStackTrace();
}
break;
}
for (ItemObject item : itemList) {
item.newY(speed * i);
}
Message rMessage = new Message();
rMessage.what = REFRESH_VIEW;
handler.sendMessage(rMessage);
try {
Thread.sleep(2);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
for (ItemObject item : itemList) {
if (item.isSelected()) {
if (onSelectListener != null)
onSelectListener.endSelect(item.id, item.itemText);
break;
}
}
}
}).start();
}
/**
* 移动到默认位置
*
* @param move
*/
private void defaultMove(int move) {
for (ItemObject item : itemList) {
item.newY(move);
}
Message rMessage = new Message();
rMessage.what = REFRESH_VIEW;
handler.sendMessage(rMessage);
}
/**
* 滑动监听
*/
private void onSelectListener() {
if (onSelectListener == null)
return;
for (ItemObject item : itemList) {
if (item.isSelected()) {
onSelectListener.selecting(item.id, item.itemText);
}
}
}
/**
* 绘制线条
*
* @param canvas
*/
private void drawLine(Canvas canvas) {
if (linePaint == null) {
linePaint = new Paint();
linePaint.setColor(lineColor);
linePaint.setAntiAlias(true);
linePaint.setStrokeWidth(lineWidth);
}
canvas.drawLine(0, controlHeight / 2 - unitHeight / 2 + 2,
controlWidth, controlHeight / 2 - unitHeight / 2 + 2, linePaint);
canvas.drawLine(0, controlHeight / 2 + unitHeight / 2 - 2,
controlWidth, controlHeight / 2 + unitHeight / 2 - 2, linePaint);
}
/**
* 绘制遮盖板
*
* @param canvas
*/
private void drawMask(Canvas canvas) {
LinearGradient lg = new LinearGradient(0, 0, 0, maskHight, 0x00f2f2f2,
0x00f2f2f2, TileMode.MIRROR);
Paint paint = new Paint();
paint.setShader(lg);
canvas.drawRect(0, 0, controlWidth, maskHight, paint);
LinearGradient lg2 = new LinearGradient(0, controlHeight - maskHight,
0, controlHeight, 0x00f2f2f2, 0x00f2f2f2, TileMode.MIRROR);
Paint paint2 = new Paint();
paint2.setShader(lg2);
canvas.drawRect(0, controlHeight - maskHight, controlWidth,
controlHeight, paint2);
}
/**
* 初始化，获取设置的属性
*
* @param context
* @param attrs
*/
private void init(Context context, AttributeSet attrs) {
TypedArray attribute = context.obtainStyledAttributes(attrs,
R.styleable.WheelView);
unitHeight = (int) attribute.getDimension(
R.styleable.WheelView_unitHight, 32);
normalFont = attribute.getDimension(
R.styleable.WheelView_normalTextSize, 14.0f);
selectedFont = attribute.getDimension(
R.styleable.WheelView_selectedTextSize, 22.0f);
itemNumber = attribute.getInt(R.styleable.WheelView_itemNumber, 7);
normalColor = attribute.getColor(
R.styleable.WheelView_normalTextColor, 0xff000000);
selectedColor = attribute.getColor(
R.styleable.WheelView_selectedTextColor, 0xffff0000);
lineColor = attribute.getColor(R.styleable.WheelView_lineColor,
0xff000000);
lineWidth = attribute.getDimension(R.styleable.WheelView_lineHeight, 2f);
maskHight = attribute.getDimension(R.styleable.WheelView_maskHight,
48.0f);
noEmpty = attribute.getBoolean(R.styleable.WheelView_noEmpty, true);
isEnable = attribute
.getBoolean(R.styleable.WheelView_isEnable, true);
attribute.recycle();
controlHeight = itemNumber * unitHeight;
}
/**
* 设置数据 （第一次）
*
* @param data
*/
public void setData(ArrayList<String> data) {
this.dataList = data;
initData();
}
/**
* 重置数据
*
* @param data
*/
public void resetData(ArrayList<String> data) {
setData(data);
invalidate();
}
/**
* 获取返回项 id
*
* @return
*/
public int getSelected() {
for (ItemObject item : itemList) {
if (item.isSelected())
return item.id;
}
return -1;
}
/**
* 获取返回的内容
*
* @return
*/
public String getSelectedText() {
for (ItemObject item : itemList) {
if (item.isSelected())
return item.itemText;
}
return "";
}
/**
* 是否正在滑动
*
* @return
*/
public boolean isScrolling() {
return isScrolling;
}
/**
* 是否可用
*
* @return
*/
public boolean isEnable() {
return isEnable;
}
/**
* 设置是否可用
*
* @param isEnable
*/
public void setEnable(boolean isEnable) {
this.isEnable = isEnable;
}
/**
* 设置默认选项
*
* @param index
*/
public void setDefault(int index) {
if (index > itemList.size() - 1)
return;
float move = itemList.get(index).moveToSelected();
defaultMove((int) move);
}
/**
* 获取列表大小
*
* @return
*/
public int getListSize() {
if (itemList == null)
return 0;
return itemList.size();
}
/**
* 获取某项的内容
*
* @param index
* @return
*/
public String getItemText(int index) {
if (itemList == null)
return "";
return itemList.get(index).itemText;
}
/**
* 监听
*
* @param onSelectListener
*/
public void setOnSelectListener(OnSelectListener onSelectListener) {
this.onSelectListener = onSelectListener;
}
@SuppressLint("HandlerLeak")
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case REFRESH_VIEW:
invalidate();
break;
default:
break;
}
}
};
/**
* 单条内容
*
* @author JiangPing
*/
private class ItemObject {
/**
* id
*/
public int id = 0;
/**
* 内容
*/
public String itemText = "";
/**
* x坐标
*/
public int x = 0;
/**
* y坐标
*/
public int y = 0;
/**
* 移动距离
*/
public int move = 0;
/**
* 字体画笔
*/
private Paint textPaint;
/**
* 字体范围矩形
*/
private Rect textRect;
public ItemObject() {
super();
}
/**
* 绘制自身
*
* @param canvas
*/
public void drawSelf(Canvas canvas) {
if (textPaint == null) {
textPaint = new Paint();
textPaint.setAntiAlias(true);
}
if (textRect == null)
textRect = new Rect();
// 判断是否被选择
if (isSelected()) {
textPaint.setColor(selectedColor);
// 获取距离标准位置的距离
float moveToSelect = moveToSelected();
moveToSelect = moveToSelect > 0 ? moveToSelect : moveToSelect
* (-1);
// 计算当前字体大小
float textSize = (float) normalFont
+ ((float) (selectedFont - normalFont) * (1.0f - (float) moveToSelect
/ (float) unitHeight));
textPaint.setTextSize(textSize);
} else {
textPaint.setColor(normalColor);
textPaint.setTextSize(normalFont);
}
// 返回包围整个字符串的最小的一个Rect区域
textPaint.getTextBounds(itemText, 0, itemText.length(), textRect);
// 判断是否可视
if (!isInView())
return;
// 绘制内容
canvas.drawText(itemText, x + controlWidth / 2 - textRect.width()
/ 2, y + move + unitHeight / 2 + textRect.height() / 2,
textPaint);
}
/**
* 是否在可视界面内
*
* @return
*/
public boolean isInView() {
if (y + move > controlHeight
|| (y + move + unitHeight / 2 + textRect.height() / 2) < 0)
return false;
return true;
}
/**
* 移动距离
*
* @param _move
*/
public void move(int _move) {
this.move = _move;
}
/**
* 设置新的坐标
*
* @param _move
*/
public void newY(int _move) {
this.move = 0;
this.y = y + _move;
}
/**
* 判断是否在选择区域内
*
* @return
*/
public boolean isSelected() {
if ((y + move) >= controlHeight / 2 - unitHeight / 2 + 2
&& (y + move) <= controlHeight / 2 + unitHeight / 2 - 2)
return true;
if ((y + move + unitHeight) >= controlHeight / 2 - unitHeight / 2
+ 2
&& (y + move + unitHeight) <= controlHeight / 2
+ unitHeight / 2 - 2)
return true;
if ((y + move) <= controlHeight / 2 - unitHeight / 2 + 2
&& (y + move + unitHeight) >= controlHeight / 2
+ unitHeight / 2 - 2)
return true;
return false;
}
/**
* 获取移动到标准位置需要的距离
*/
public float moveToSelected() {
return (controlHeight / 2 - unitHeight / 2) - (y + move);
}
}
/**
* 选择监听
*
* @author JiangPing
*/
public interface OnSelectListener {
/**
* 结束选择
*
* @param id
* @param text
*/
public void endSelect(int id, String text);
/**
* 选中的内容
*
* @param id
* @param text
*/
public void selecting(int id, String text);
}
}