android.support.v4.view.ViewCompat#setTranslationX ( )源码实例Demo

@Override
public boolean animateChange(ViewHolder oldHolder, ViewHolder newHolder,
        int fromX, int fromY, int toX, int toY) {
    final float prevTranslationX = ViewCompat.getTranslationX(oldHolder.itemView);
    final float prevTranslationY = ViewCompat.getTranslationY(oldHolder.itemView);
    final float prevAlpha = ViewCompat.getAlpha(oldHolder.itemView);
    resetAnimation(oldHolder);
    int deltaX = (int) (toX - fromX - prevTranslationX);
    int deltaY = (int) (toY - fromY - prevTranslationY);
    // recover prev translation state after ending animation
    ViewCompat.setTranslationX(oldHolder.itemView, prevTranslationX);
    ViewCompat.setTranslationY(oldHolder.itemView, prevTranslationY);
    ViewCompat.setAlpha(oldHolder.itemView, prevAlpha);
    if (newHolder != null && newHolder.itemView != null) {
        // carry over translation values
        resetAnimation(newHolder);
        ViewCompat.setTranslationX(newHolder.itemView, -deltaX);
        ViewCompat.setTranslationY(newHolder.itemView, -deltaY);
        ViewCompat.setAlpha(newHolder.itemView, 0);
    }
    mPendingChanges.add(new ChangeInfo(oldHolder, newHolder, fromX, fromY, toX, toY));
    return true;
}
 

@Override
public boolean animateMove(final RecyclerView.ViewHolder holder, int fromX, int fromY,
                           int toX, int toY) {
    final View view = holder.itemView;
    int deltaX = toX - fromX;
    int deltaY = toY - fromY;
    if (deltaX == 0 && deltaY == 0) {
        dispatchMoveFinished(holder);
        return false;
    }
    if (deltaX != 0) {
        ViewCompat.setTranslationX(view, -deltaX);
    }
    if (deltaY != 0) {
        ViewCompat.setTranslationY(view, -deltaY);
    }
    mPendingMoves.add(new MoveInfo(holder, fromX, fromY, toX, toY));
    return true;
}
 

@Override
public boolean animateChange(ViewHolder oldHolder, ViewHolder newHolder, int fromX, int fromY,
    int toX, int toY) {
  final float prevTranslationX = ViewCompat.getTranslationX(oldHolder.itemView);
  final float prevTranslationY = ViewCompat.getTranslationY(oldHolder.itemView);
  final float prevAlpha = ViewCompat.getAlpha(oldHolder.itemView);
  endAnimation(oldHolder);
  int deltaX = (int) (toX - fromX - prevTranslationX);
  int deltaY = (int) (toY - fromY - prevTranslationY);
  // recover prev translation state after ending animation
  ViewCompat.setTranslationX(oldHolder.itemView, prevTranslationX);
  ViewCompat.setTranslationY(oldHolder.itemView, prevTranslationY);
  ViewCompat.setAlpha(oldHolder.itemView, prevAlpha);
  if (newHolder != null && newHolder.itemView != null) {
    // carry over translation values
    endAnimation(newHolder);
    ViewCompat.setTranslationX(newHolder.itemView, -deltaX);
    ViewCompat.setTranslationY(newHolder.itemView, -deltaY);
    ViewCompat.setAlpha(newHolder.itemView, 0);
  }
  mPendingChanges.add(new ChangeInfo(oldHolder, newHolder, fromX, fromY, toX, toY));
  return true;
}
 

private boolean endChangeAnimationIfNecessary(ChangeInfo changeInfo, RecyclerView.ViewHolder item) {
    boolean oldItem = false;
    if (changeInfo.newHolder == item) {
        changeInfo.newHolder = null;
    } else if (changeInfo.oldHolder == item) {
        changeInfo.oldHolder = null;
        oldItem = true;
    } else {
        return false;
    }
    ViewCompat.setAlpha(item.itemView, 1);
    ViewCompat.setTranslationX(item.itemView, 0);
    ViewCompat.setTranslationY(item.itemView, 0);
    dispatchChangeFinished(item, oldItem);
    return true;
}
 

@Override
public boolean animateMove(final ViewHolder holder, int fromX, int fromY,
                           int toX, int toY) {
    final View view = holder.itemView;
    fromX += ViewCompat.getTranslationX(holder.itemView);
    fromY += ViewCompat.getTranslationY(holder.itemView);
    endAnimation(holder);
    int deltaX = toX - fromX;
    int deltaY = toY - fromY;
    if (deltaX == 0 && deltaY == 0) {
        dispatchMoveFinished(holder);
        return false;
    }
    if (deltaX != 0) {
        ViewCompat.setTranslationX(view, -deltaX);
    }
    if (deltaY != 0) {
        ViewCompat.setTranslationY(view, -deltaY);
    }
    mPendingMoves.add(new MoveInfo(holder, fromX, fromY, toX, toY));
    return true;
}
 

private boolean endChangeAnimationIfNecessary(ChangeInfo changeInfo, ViewHolder item) {
    boolean oldItem = false;
    if (changeInfo.newHolder == item) {
        changeInfo.newHolder = null;
    } else if (changeInfo.oldHolder == item) {
        changeInfo.oldHolder = null;
        oldItem = true;
    } else {
        return false;
    }
    ViewCompat.setAlpha(item.itemView, 1);
    ViewCompat.setTranslationX(item.itemView, 0);
    ViewCompat.setTranslationY(item.itemView, 0);
    dispatchChangeFinished(item, oldItem);
    return true;
}
 

@Override
public void handleRightPage(View view, float position) {
    ViewCompat.setTranslationX(view, -view.getWidth() * position);

    ViewCompat.setPivotX(view, view.getWidth() * 0.5f);
    ViewCompat.setPivotY(view, view.getHeight() * 0.5f);
    ViewCompat.setScaleX(view, 1 - position);
    ViewCompat.setScaleY(view, 1 - position);
    ViewCompat.setAlpha(view, 1 - position);
}
 

@Override
protected void onTransform(View view, float position) {
	final float height = view.getHeight();
	final float width = view.getWidth();
	final float scale = min(position < 0 ? 1f : Math.abs(1f - position), 0.5f);

       ViewCompat.setScaleX(view, scale);
       ViewCompat.setScaleY(view,scale);
       ViewCompat.setPivotX(view,width*0.5f);
       ViewCompat.setPivotY(view,height*0.5f);
       ViewCompat.setTranslationX(view,position < 0 ? width * position : -width * position * 0.25f);
}
 

public static void clear(View v) {
    ViewCompat.setAlpha(v, 1);
    ViewCompat.setScaleY(v, 1);
    ViewCompat.setScaleX(v, 1);
    ViewCompat.setTranslationY(v, 0);
    ViewCompat.setTranslationX(v, 0);
    ViewCompat.setRotation(v, 0);
    ViewCompat.setRotationY(v, 0);
    ViewCompat.setRotationX(v, 0);
    v.setPivotY(v.getMeasuredHeight() / 2);
    ViewCompat.setPivotX(v, v.getMeasuredWidth() / 2);
    ViewCompat.animate(v).setInterpolator(null);
}
 

@Override
public void handleRightPage(View view, float position) {
    ViewCompat.setTranslationX(view, -view.getWidth() * position);

    ViewCompat.setPivotX(view, view.getWidth() * 0.5f);
    ViewCompat.setPivotY(view, view.getHeight() * 0.5f);
    ViewCompat.setScaleX(view, 1 - position);
    ViewCompat.setScaleY(view, 1 - position);

    if (position > 0.95f) {
        ViewCompat.setAlpha(view, 0);
    } else {
        ViewCompat.setAlpha(view, 1);
    }
}
 

@Override
public void handleLeftPage(View view, float position) {
    ViewCompat.setTranslationX(view, -view.getWidth() * position);
    float rotation = (ROTATION * position);
    ViewCompat.setRotationY(view, rotation);

    if (position > -0.5) {
        view.setVisibility(View.VISIBLE);
    } else {
        view.setVisibility(View.INVISIBLE);
    }
}
 

@Override
protected void onTransform(View view, float position) {
	final float height = view.getHeight();
	final float width = view.getWidth();
	final float scale = min(position > 0 ? 1f : Math.abs(1f + position), 0.5f);

	ViewCompat.setScaleX(view, scale);
       ViewCompat.setScaleY(view,scale);
       ViewCompat.setPivotX(view,width * 0.5f);
       ViewCompat.setPivotY(view,height * 0.5f);
       ViewCompat.setTranslationX(view,position > 0 ? width * position : -width * position * 0.25f);
}
 

@Override
public void handleLeftPage(View view, float position) {
    ViewCompat.setTranslationX(view, -view.getWidth() * position);

    ViewCompat.setPivotX(view, view.getWidth() * 0.5f);
    ViewCompat.setPivotY(view, view.getHeight() * 0.5f);
    ViewCompat.setScaleX(view, 1 + position);
    ViewCompat.setScaleY(view, 1 + position);

    if (position < -0.95f) {
        ViewCompat.setAlpha(view, 0);
    } else {
        ViewCompat.setAlpha(view, 1);
    }
}
 

@Override
public void handleLeftPage(View view, float position) {
    ViewCompat.setTranslationX(view, -view.getWidth() * position);

    ViewCompat.setPivotX(view, view.getWidth() * 0.5f);
    ViewCompat.setPivotY(view, view.getHeight() * 0.5f);
    ViewCompat.setScaleX(view, 1 + position);
    ViewCompat.setScaleY(view, 1 + position);

    if (position < -0.95f) {
        ViewCompat.setAlpha(view, 0);
    } else {
        ViewCompat.setAlpha(view, 1);
    }
}
 

@Override
public void handleRightPage(View view, float position) {
    ViewCompat.setTranslationX(view, -view.getWidth() * position);

    ViewCompat.setPivotX(view, view.getWidth() * 0.5f);
    ViewCompat.setPivotY(view, view.getHeight() * 0.5f);
    ViewCompat.setScaleX(view, 1 - position);
    ViewCompat.setScaleY(view, 1 - position);

    if (position > 0.95f) {
        ViewCompat.setAlpha(view, 0);
    } else {
        ViewCompat.setAlpha(view, 1);
    }
}
 

@Override
protected void onAddCanceled(ViewHolder holder) {
    ViewCompat.setTranslationX(holder.itemView, 0);
}
 

@Override
public void handleRightPage(View view, float position) {
    ViewCompat.setTranslationX(view, -view.getWidth() * position);
    ViewCompat.setAlpha(view, 1 - position);
}
 

public void onDraw(Canvas c, RecyclerView recyclerView, View view, float dX, float dY, int actionState, boolean isCurrentlyActive) {
    ViewCompat.setTranslationX(view, dX);
    ViewCompat.setTranslationY(view, dY);
}
 

@Override
protected void preAnimateAddImpl(RecyclerView.ViewHolder holder) {
    ViewCompat.setTranslationX(holder.itemView,
            -holder.itemView.getRootView().getWidth() * .25f);
    ViewCompat.setAlpha(holder.itemView, 0);
}
 

@Override
protected void preAnimateAddImpl(RecyclerView.ViewHolder holder) {
    ViewCompat.setTranslationX(holder.itemView, -holder.itemView.getRootView().getWidth());
}