package com.whr.myapplication;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Build;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import java.util.ArrayList;
public class MyView extends LinearLayout implements Runnable
{
private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
// 被点击的控件的宽高
private int mTargetWidth;
private int mTargetHeight;
// 在被选中的控件长宽中的最大值和最小值
private int mMinBetweenWidthAndHeight;
private int mMaxBetweenWidthAndHeight;
// mMaxRadius为绘制的水波纹圆圈最大的半径
private int mMaxRevealRadius;
// mRevealRadiusGap为每次重新绘制半径增加的值
private int mRevealRadiusGap;
// mRevealRadius为初始的数值
private int mRevealRadius = 0;
// 用户点击处的坐标
private float mCenterX;
private float mCenterY;
// 获取自定义控件MyRevealLayout 在屏幕上的位置
private int[] mLocationInScreen = new int[2];
// 是否执行动画
private boolean mShouldDoAnimation = false;
// 是否被按下
private boolean mIsPressed = false;
// 重新绘制的时间 单位毫秒
private int INVALIDATE_DURATION = 50;
// mTouchTarget指的是用户点击的那个view
private View mTouchTarget;
// 松手的事件分发线程
private DispatchUpTouchEventRunnable mDispatchUpTouchEventRunnable = new DispatchUpTouchEventRunnable();
public MyView(Context context)
{
super(context);
init();
}
public MyView(Context context, AttributeSet attrs)
{
super(context, attrs);
init();
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public MyView(Context context, AttributeSet attrs, int defStyleAttr)
{
super(context, attrs, defStyleAttr);
init();
}
private void init()
{
setWillNotDraw(false);
mPaint.setColor(Color.BLACK);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b)
{
super.onLayout(changed, l, t, r, b);
this.getLocationOnScreen(mLocationInScreen);//获取在整个屏幕内的绝对坐标
// Log.i("---", "onLayout: "+l+"---"+mLocationInScreen[0]);
}
/**
* 获得最大半径
* @param event
* @param view
*/
private void initParametersForChild(MotionEvent event, View view)
{
mCenterX = event.getX();
mCenterY = event.getY();
mTargetWidth = view.getMeasuredWidth();
mTargetHeight = view.getMeasuredHeight();
mMinBetweenWidthAndHeight = Math.min(mTargetWidth, mTargetHeight);
mMaxBetweenWidthAndHeight = Math.max(mTargetWidth, mTargetHeight);
mRevealRadius = 0;
mShouldDoAnimation = true;
mIsPressed = true;
mRevealRadiusGap = mMinBetweenWidthAndHeight / 8;
int[] location = new int[2];
view.getLocationOnScreen(location);
int left = location[0] - mLocationInScreen[0];
int transformedCenterX = (int) mCenterX - left;
mMaxRevealRadius = Math.max(transformedCenterX, mTargetWidth - transformedCenterX);
}
/**
* 绘制水波
*/
protected void dispatchDraw(Canvas canvas)
{
super.dispatchDraw(canvas);
if (!mShouldDoAnimation || mTargetWidth <= 0 || mTouchTarget == null)
{
return;
}
if (mRevealRadius > mMinBetweenWidthAndHeight / 2)
{
mRevealRadius += mRevealRadiusGap * 4;
} else
{
mRevealRadius += mRevealRadiusGap;
}
this.getLocationOnScreen(mLocationInScreen);
int[] location = new int[2];
mTouchTarget.getLocationOnScreen(location);
// 获得要绘制View的left, top, right, bottom值
int left = location[0] - mLocationInScreen[0];
int top = location[1] - mLocationInScreen[1];
int right = left + mTouchTarget.getMeasuredWidth();
int bottom = top + mTouchTarget.getMeasuredHeight();
canvas.save();
canvas.clipRect(left, top, right, bottom);//裁剪一个矩形，放置圆形越界
canvas.drawCircle(mCenterX, mCenterY, mRevealRadius, mPaint);
canvas.restore();//save restore 实现了显示 消失
if (mRevealRadius <= mMaxRevealRadius)
{
postInvalidateDelayed(INVALIDATE_DURATION, left, top, right, bottom);
} else if (!mIsPressed)
{
mShouldDoAnimation = false;//不再花园
postInvalidateDelayed(INVALIDATE_DURATION, left, top, right, bottom);
}
}
@Override
public boolean dispatchTouchEvent(MotionEvent event)
{
// 获得相对于屏幕的坐标
int x = (int) event.getRawX();
int y = (int) event.getRawY();
// 获得动作
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN)
{
View touchTarget = getTouchTarget(this, x, y);
if (touchTarget != null && touchTarget.isClickable() && touchTarget.isEnabled())
{
mTouchTarget = touchTarget;
initParametersForChild(event, touchTarget);//获取半径
// 刷新界面，延迟执行时间
// postInvalidateDelayed(INVALIDATE_DURATION);
}
} else if (action == MotionEvent.ACTION_UP)
{
mIsPressed = false;
postInvalidateDelayed(INVALIDATE_DURATION);
mDispatchUpTouchEventRunnable.event = event;
postDelayed(mDispatchUpTouchEventRunnable, 40);
return true;
} else if (action == MotionEvent.ACTION_CANCEL)
{
mIsPressed = false;
postInvalidateDelayed(INVALIDATE_DURATION);
}
return super.dispatchTouchEvent(event);
}
/**
* 遍历view树找到用户所点击的那个view
*
* @param view
* @param x
* @param y
* @return
*/
private View getTouchTarget(View view, int x, int y)
{
View target = null;
ArrayList TouchableViews = view.getTouchables();
for (View child : TouchableViews)
{
if (isTouchPointInView(child, x, y))
{
target = child;
break;
}
}
return target;
}
/**
* 判断事件的xy是否落在view的上下左右四个角之内
*
* @param view
* @param x
* @param y
* @return
*/
private boolean isTouchPointInView(View view, int x, int y)
{
int[] location = new int[2];
view.getLocationOnScreen(location);
int left = location[0];
int top = location[1];
int right = left + view.getMeasuredWidth();
int bottom = top + view.getMeasuredHeight();
if (view.isClickable() && y >= top && y <= bottom && x >= left && x <= right)
{
return true;
}
return false;
}
// 使用代码主动去调用控件的点击事件（模拟人手去触摸控件）
@Override
public boolean performClick()
{
Log.i("===", "performClick: ");
postDelayed(this, 400);
return true;
}
@Override
public void run()
{
super.performClick();
}
private class DispatchUpTouchEventRunnable implements Runnable
{
public MotionEvent event;
@Override
public void run()
{
if (mTouchTarget == null || !mTouchTarget.isEnabled())
{
return;
}
if (isTouchPointInView(mTouchTarget, (int) event.getRawX(), (int) event.getRawY()))
{
// 使用代码主动去调用控件的点击事件（模拟人手去触摸控件）
mTouchTarget.performClick();
}
}
};
}
