package cn.coderss.ui;
import java.util.List;
import cn.coderss.edu.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Parcelable;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
/**
* android标签云 by loader
* @author 亓斌 (qibin0506@gmail.com)
* <p>
*
* 使用方法：<p>
在xml中配置：<p>
<org.loader.labelview.LabelView<p>
xmlns:label="http://schemas.android.com/apk/res/org.loader.labelview"<p>
android:layout_marginTop="20dp"<p>
android:id="@+id/lv"<p>
android:layout_below="@id/et_input"<p>
android:layout_width="wrap_content"<p>
android:layout_height="wrap_content"<p>
label:is_static="false"<p>
android:background="@android:color/white"/><p>
<p>
setLabels设置标签，<p>
setColorSchema设置配色方案， <p>
setSpeeds设置每一个的x/y速度，<p>
setOnItemClick可以监听item的click事件<p>
使用时，别忘了copy values目录下的attrs.xml到你的项目中<p>
可参考demo中的MainActivity.java文件<p>
*/
public class LabelView extends View {
private static final int DIRECTION_LEFT = 0; // 向左
private static final int DIRECTION_RIGHT = 1; // 向右
private static final int DIRECITON_TOP = 2; // 向上
private static final int DIRECTION_BOTTOM = 3; // 向下
private boolean isStatic; // 是否静止， 默认false， 可用干xml ： label:is_static="false"
private int[][] mLocations; // 每个label的位置 x/y
private int[][] mDirections; // 每个label的方向 x/y
private int[][] mSpeeds; // 每个label的x/y速度 x/y
private int[][] mTextWidthAndHeight; // 每个labeltext的大小 width/height
private String[] mLabels; // 设置的labels
private int[] mFontSizes; // 每个label的字体大小
// 默认配色方案
private int[] mColorSchema = {0XFFFF0000, 0XFF00FF00, 0XFF0000FF, 0XFFCCCCCC, 0XFFFFFFFF};
private int mTouchSlop; // 最小touch
private int mDownX = -1;
private int mDownY = -1;
private int mDownIndex = -1; // 点击的index
private Paint mPaint;
private Thread mThread;
private OnItemClickListener mListener; // item点击事件
public LabelView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public LabelView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.LabelView, defStyleAttr, 0);
isStatic = ta.getBoolean(R.styleable.LabelView_is_static, false);
ta.recycle();
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
mPaint = new Paint();
mPaint.setAntiAlias(true);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right,
int bottom) {
super.onLayout(changed, left, top, right, bottom);
init();
}
@Override
protected void onDraw(Canvas canvas) {
if(!hasContents()) {
return;
}
for (int i = 0; i < mLabels.length; i++) {
mPaint.setTextSize(mFontSizes[i]);
if(i < mColorSchema.length) mPaint.setColor(mColorSchema[i]);
else mPaint.setColor(mColorSchema[i-mColorSchema.length]);
canvas.drawText(mLabels[i], mLocations[i][0], mLocations[i][1], mPaint);
}
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
mDownX = (int) ev.getX();
mDownY = (int) ev.getY();
mDownIndex = getClickIndex();
break;
case MotionEvent.ACTION_UP:
int nowX = (int) ev.getX();
int nowY = (int) ev.getY();
if (nowX - mDownX < mTouchSlop && nowY - mDownY < mTouchSlop
&& mDownIndex != -1 && mListener != null) {
mListener.onItemClick(mDownIndex, mLabels[mDownIndex]);
}
mDownX = mDownY = mDownIndex = -1;
break;
}
return true;
}
/**
* 获取当前点击的label的位置
* @return label的位置，没有点中返回-1
*/
private int getClickIndex() {
Rect downRect = new Rect();
Rect locationRect = new Rect();
for(int i=0;i<mLocations.length;i++) {
downRect.set(mDownX - mTextWidthAndHeight[i][0], mDownY
- mTextWidthAndHeight[i][1], mDownX
+ mTextWidthAndHeight[i][0], mDownY
+ mTextWidthAndHeight[i][1]);
locationRect.set(mLocations[i][0], mLocations[i][1],
mLocations[i][0] + mTextWidthAndHeight[i][0],
mLocations[i][1] + mTextWidthAndHeight[i][1]);
if(locationRect.intersect(downRect)) {
return i;
}
}
return -1;
}
/**
* 开启子线程不断刷新位置并postInvalidate
*/
private void run() {
if(mThread != null && mThread.isAlive()) {
return;
}
mThread = new Thread(mStartRunning);
mThread.start();
}
private Runnable mStartRunning = new Runnable() {
@Override
public void run() {
for(;;) {
SystemClock.sleep(100);
for (int i = 0; i < mLabels.length; i++) {
if (mLocations[i][0] <= getPaddingLeft()) {
mDirections[i][0] = DIRECTION_RIGHT;
}
if (mLocations[i][0] >= getMeasuredWidth()
- getPaddingRight() - mTextWidthAndHeight[i][0]) {
mDirections[i][0] = DIRECTION_LEFT;
}
if(mLocations[i][1] <= getPaddingTop() + mTextWidthAndHeight[i][1]) {
mDirections[i][1] = DIRECTION_BOTTOM;
}
if (mLocations[i][1] >= getMeasuredHeight() - getPaddingBottom()) {
mDirections[i][1] = DIRECITON_TOP;
}
int xSpeed = 1;
int ySpeed = 2;
if(i < mSpeeds.length) {
xSpeed = mSpeeds[i][0];
ySpeed = mSpeeds[i][1];
}
else {
xSpeed = mSpeeds[i-mSpeeds.length][0];
ySpeed = mSpeeds[i-mSpeeds.length][1];
}
mLocations[i][0] += mDirections[i][0] == DIRECTION_RIGHT ? xSpeed : -xSpeed;
mLocations[i][1] += mDirections[i][1] == DIRECTION_BOTTOM ? ySpeed : -ySpeed;
}
postInvalidate();
}
}
};
/**
* 初始化位置、方向、label宽高
* 并开启线程
*/
private void init() {
if(!hasContents()) {
return;
}
int minX = getPaddingLeft();
int minY = getPaddingTop();
int maxX = getMeasuredWidth() - getPaddingRight();
int maxY = getMeasuredHeight() - getPaddingBottom();
Rect textBounds = new Rect();
for (int i = 0; i < mLabels.length; i++) {
int[] location = new int[2];
location[0] = minX + (int) (Math.random() * maxX);
location[1] = minY + (int) (Math.random() * maxY);
mLocations[i] = location;
mFontSizes[i] = 15 + (int) (Math.random() * 30);
mDirections[i][0] = Math.random() > 0.5 ? DIRECTION_RIGHT : DIRECTION_LEFT;
mDirections[i][1] = Math.random() > 0.5 ? DIRECTION_BOTTOM : DIRECITON_TOP;
mPaint.setTextSize(mFontSizes[i]);
mPaint.getTextBounds(mLabels[i], 0, mLabels[i].length(), textBounds);
mTextWidthAndHeight[i][0] = textBounds.width();
mTextWidthAndHeight[i][1] = textBounds.height();
}
if(!isStatic) run();
}
/**
* 是否设置label
* @return true or false
*/
private boolean hasContents() {
return mLabels != null && mLabels.length > 0;
}
/**
* 设置labels
* @see setLabels(String[] labels)
* @param labels
*/
public void setLabels(List<String> labels) {
setLabels((String[]) labels.toArray());
}
/**
* 设置labels
* @param labels
*/
public void setLabels(String[] labels) {
mLabels = labels;
mLocations = new int[labels.length][2];
mFontSizes = new int[labels.length];
mDirections = new int[labels.length][2];
mTextWidthAndHeight = new int[labels.length][2];
mSpeeds = new int[labels.length][2];
for(int speed[] : mSpeeds) {
speed[0] = speed[1] = 1;
}
requestLayout();
}
/**
* 设置配色方案
* @param colorSchema
*/
public void setColorSchema(int[] colorSchema) {
mColorSchema = colorSchema;
}
/**
* 设置每个item的x/y速度
* <p>
* speeds.length > labels.length 忽略多余的
* <p>
* speeds.length < labels.length 将重复使用
*
* @param speeds
*/
public void setSpeeds(int[][] speeds) {
mSpeeds = speeds;
}
/**
* 设置item点击的监听事件
* @param l
*/
public void setOnItemClickListener(OnItemClickListener l) {
getParent().requestDisallowInterceptTouchEvent(true);
mListener = l;
}
/**
* item的点击监听事件
*/
public interface OnItemClickListener {
public void onItemClick(int index, String label);
}
}