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TestViewDragHelper.java
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TestViewDragHelper.java
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package com.suphu.demo.widget;
import android.content.Context;
import android.support.annotation.Nullable;
import android.support.v4.widget.ViewDragHelper;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
/**
* Created by huchao on 2017/8/9.
*/
public class TestViewDragHelper extends LinearLayout{
private static final String TAG="TestViewDragHelper";
private ViewDragHelper viewDragHelper;
private View view1;
private View view2;
public TestViewDragHelper(Context context) {
this(context,null);
}
public TestViewDragHelper(Context context, @Nullable AttributeSet attrs) {
this(context, attrs,0);
}
public TestViewDragHelper(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
viewDragHelper=ViewDragHelper.create(this, 1.0f, new ViewDragHelper.Callback() {
@Override
public boolean tryCaptureView(View child, int pointerId) {
Log.d(TAG,"tryCaptureView,是否可以拖拽的View:,pointerId:"+pointerId);
return true;
}
@Override
public int clampViewPositionHorizontal(View child, int left, int dx) {
Log.d(TAG,"clampViewPositionHorizontal是否可以《水平》移动的View,left:"+left+",dx:"+dx);
return left;
}
@Override
public int clampViewPositionVertical(View child, int top, int dy) {
Log.d(TAG,"clampViewPositionVertical是否可以《垂直》移动的View,top:"+top+",dx:"+dy);
return top;
}
@Override
public void onViewDragStateChanged(int state) {
super.onViewDragStateChanged(state);
//点击拖动时state=1 松开停止=0 ps:如果View被禁止,则不会触发
Log.d(TAG,"onViewDragStateChanged状态变化,state:"+state);
}
@Override
public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
super.onViewPositionChanged(changedView, left, top, dx, dy);
//对clampViewPositionVertical及Horizontal 变化的补充
Log.d(TAG,"onViewPositionChanged状位置变化,left:"+left+",top:"+top);
}
@Override
public void onViewCaptured(View capturedChild, int activePointerId) {
super.onViewCaptured(capturedChild, activePointerId);
//view被拖动结算时调用
Log.d(TAG,"onViewCaptured,activePointerId:"+activePointerId);
}
@Override
public void onViewReleased(View releasedChild, float xvel, float yvel) {
super.onViewReleased(releasedChild, xvel, yvel);
//View释放时调用
Log.d(TAG,"onViewReleased,速度Xvel:"+xvel+",速度Yvel:"+yvel);
}
@Override
public void onEdgeTouched(int edgeFlags, int pointerId) {
super.onEdgeTouched(edgeFlags, pointerId);
//当view被禁止拖动后,且调用setEdgeTrackingEnabled后 touch边界时会触发
Log.d(TAG,"onEdgeTouched,edgeFlags:"+edgeFlags+",pointerId:"+pointerId);
}
@Override
public void onEdgeDragStarted(int edgeFlags, int pointerId) {
super.onEdgeDragStarted(edgeFlags, pointerId);
//同上,紧接着上面函数后被触发 此时不会使得View移动,需要 captureChildView方法把view和pointerId传入
Log.d(TAG,"onEdgeDragStarted,edgeFlags:"+edgeFlags+",pointerId:"+pointerId);
viewDragHelper.captureChildView(view2, pointerId);
}
@Override
public boolean onEdgeLock(int edgeFlags) {
Log.d(TAG,"onEdgeLock:"+edgeFlags);
return super.onEdgeLock(edgeFlags);
}
@Override
public int getOrderedChildIndex(int index) {
Log.d(TAG,"getOrderedChildIndex,index:"+index);
return super.getOrderedChildIndex(index);
}
@Override
public int getViewHorizontalDragRange(View child) {
//大于0 才能被正常捕获 当子view有点击事件 需要返回>0的
Log.d(TAG,"getViewHorizontalDragRange:"+super.getViewHorizontalDragRange(child));
return super.getViewHorizontalDragRange(child);
}
@Override
public int getViewVerticalDragRange(View child) {
return super.getViewVerticalDragRange(child);
}
});
viewDragHelper.setEdgeTrackingEnabled(ViewDragHelper.EDGE_LEFT);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
view1=getChildAt(0);
view2=getChildAt(1);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
Log.d(TAG,"onInterceptTouchEvent拦截");
return viewDragHelper.shouldInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
viewDragHelper.processTouchEvent(event);
// Log.d(TAG,"onTouchEvent消费");
return true;
}
}