public abstract class SwipeMenuViewHolder {
/* 从左侧滑出菜单 */
public static final int EDGE_LEFT = 1;
/* 从右侧滑出菜单 */
public static final int EDGE_RIGHT = 2;
/* 默认从右侧滑出菜单 */
private int mTrackingEdges = EDGE_RIGHT;
/* 滑出来的布局 */
private View swipMenuView;
/* 可以拖动的布局 */
private View captureView;
/* 整个条目的布局 */
protected DragLayout itemView;
private Context context;
private DragViewHolder dragViewHolder;
public SwipeMenuViewHolder(Context context, View swipMenuView, View captureView) {
this.swipMenuView = swipMenuView;
this.captureView = captureView;
this.context = context;
initItemView();
}
public SwipeMenuViewHolder(Context context, View swipMenuView, View captureView, int mTrackingEdges) {
this.mTrackingEdges = mTrackingEdges;
this.swipMenuView = swipMenuView;
this.captureView = captureView;
this.context = context;
initItemView();
}
private void initItemView() {
itemView = new DragLayout(context);
itemView.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
itemView.setmTrackingEdges(mTrackingEdges);
itemView.initView(captureView, swipMenuView);
dragViewHolder = new DragViewHolder(this, itemView);
}
public boolean isOpen() {
return itemView.state == DragLayout.STATE_OPNE;
}
public DragViewHolder getDragViewHolder() {
return dragViewHolder;
}
/**
* 初始化控件
*
* @param itemView 条目的布局
*/
public abstract void initView(View itemView);
/**
* 获取this
*
* @param viewHolder 获取当前的 ViewHolder
* @return RecyclerViewDragHolder
*/
public static SwipeMenuViewHolder getHolder(RecyclerView.ViewHolder viewHolder) {
return ((DragViewHolder) viewHolder).holder;
}
class DragViewHolder extends RecyclerView.ViewHolder {
public SwipeMenuViewHolder holder;
public DragViewHolder(SwipeMenuViewHolder holder, View itemView) {
super(itemView);
this.holder = holder;
initView(itemView);
}
}
private class DragLayout extends FrameLayout {
private ViewDragHelper mDragHelper;
private View captureView;
private View swipeMenuView;
/* 左侧起点 */
private int startX;
/* 可拉出来布局的宽度 */
private int swipeMenuWidth;
private int mTrackingEdges = EDGE_RIGHT;
/* 滑出来的百分比，大于这个值松开自动打开，否则就关闭 */
private float scrollPercent = 0.5f;
/* 当前打开状态 */
protected int state = STATE_CLOSE;
protected static final int STATE_OPNE = 1;
protected static final int STATE_CLOSE = 2;
public DragLayout(Context context) {
super(context);
init();
}
public DragLayout(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public DragLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
public void initView(View captureView, View swipeMenuView) {
this.captureView = captureView;
this.swipeMenuView = swipeMenuView;
startX = 0;
addView(createBgView(swipeMenuView));
addView(captureView);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
if (widthMeasureSpec != 0) {
swipeMenuWidth = swipeMenuView.getWidth();
}
}
/* 可以滑出来的布局 */
private View createBgView(View view) {
LinearLayout linearLayout = new LinearLayout(getContext());
linearLayout.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
linearLayout.setGravity(mTrackingEdges == EDGE_RIGHT ? Gravity.END : Gravity.START);
linearLayout.addView(view);
return linearLayout;
}
private void init() {
mDragHelper = ViewDragHelper.create(this, 1.0f, new ViewDragCallBack());
mDragHelper.setEdgeTrackingEnabled(mTrackingEdges == EDGE_RIGHT ? ViewDragHelper.EDGE_RIGHT : ViewDragHelper.EDGE_LEFT);
}
public class ViewDragCallBack extends ViewDragHelper.Callback {
public ViewDragCallBack() {
}
@Override
public boolean tryCaptureView(View child, int pointerId) {
return child == captureView;
}
@Override
public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
if (left != startX) {
if (swipeMenuView.getVisibility() == View.GONE)
swipeMenuView.setVisibility(View.VISIBLE);
} else {
if (swipeMenuView.getVisibility() == View.VISIBLE)
swipeMenuView.setVisibility(View.GONE);
}
invalidate();
}
@Override
public void onViewReleased(View releasedChild, float xvel, float yvel) {
super.onViewReleased(releasedChild, xvel, yvel);
if (releasedChild != captureView)
return;
int endX;
Log.d("captureView.Left", captureView.getLeft() + "");
Log.d("scrollSwipeMenuWidth", (int) ((float) swipeMenuWidth * scrollPercent) + "");
Log.d("state", state + "");
Log.d("mTrackingEdges", mTrackingEdges + "");
Log.d("startX", +startX + "");
if (mTrackingEdges == EDGE_LEFT) {
if (captureView.getLeft() < (int) ((float) swipeMenuWidth * scrollPercent) || state == STATE_OPNE) {
endX = startX;
state = STATE_CLOSE;
} else {
endX = swipeMenuWidth;
state = STATE_OPNE;
// add by wanggeng for post event
postOPNEEvent();
}
} else {//bgView从右边缘滑出
if (captureView.getLeft() > -(int) ((float) swipeMenuWidth * scrollPercent) || state == STATE_OPNE) {//向右滑动关闭bgView
endX = startX;
state = STATE_CLOSE;
} else {//向左滑动拉出bgView
endX = -1 * swipeMenuWidth;
state = STATE_OPNE;
// add by wanggeng for post event
postOPNEEvent();
}
}
Log.d("endX", +endX + "");
Log.d("swipeMenuWidth", +swipeMenuWidth + "");
if (mDragHelper.smoothSlideViewTo(captureView, endX, 0)) {
ViewCompat.postInvalidateOnAnimation(DragLayout.this);
}
invalidate();
}
@Override
public int getViewHorizontalDragRange(View child) {
return (int) (swipeMenuWidth * scrollPercent);
}
/**
* @param child 被拖动到view
* @param left captureView被拖动后距x轴的距离
* @param dx 横向移动的距离
* @return captureView被拖动后距x轴的距离
*/
@Override
public int clampViewPositionHorizontal(View child, int left, int dx) {
if (mTrackingEdges == EDGE_LEFT) {
if (left > swipeMenuWidth && dx > 0) return swipeMenuWidth;
if (left < 0 && dx < 0) return 0;
} else {
if (left > 0 && dx > 0) return 0;
if (left < -swipeMenuWidth && dx < 0) return -swipeMenuWidth;
}
return left;
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (state == STATE_CLOSE) {
swipeMenuView.setVisibility(View.GONE);
}
return mDragHelper.shouldInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(@NonNull MotionEvent event) {
mDragHelper.processTouchEvent(event);
if (state == STATE_CLOSE) {
if (event.getAction() == MotionEvent.ACTION_UP) {
swipeMenuView.setVisibility(View.GONE);
}
}
return true;
}
@Override
public void computeScroll() {
super.computeScroll();
if (mDragHelper.continueSettling(true)) {
ViewCompat.postInvalidateOnAnimation(this);
}
}
public void setmTrackingEdges(int mTrackingEdges) {
this.mTrackingEdges = mTrackingEdges;
mDragHelper.setEdgeTrackingEnabled(mTrackingEdges == EDGE_RIGHT ? ViewDragHelper.EDGE_RIGHT : ViewDragHelper.EDGE_LEFT);
}
}
public void scrollToClose() {
if (itemView.mDragHelper.smoothSlideViewTo(captureView, itemView.startX, 0)) {
ViewCompat.postInvalidateOnAnimation(itemView);
}
itemView.invalidate();
}
for post event
public void postOPNEEvent() {
final ActionEvent actionEvent = new ActionEvent("STATE_OPNE");
actionEvent.setData(SwipeMenuViewHolder.this);
EventBus.getDefault().post(actionEvent);
}
}
