mirror of https://github.com/NekoX-Dev/NekoX.git
115 lines
3.2 KiB
Java
115 lines
3.2 KiB
Java
/*
|
|
* Copyright 2018 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package androidx.recyclerview.widget;
|
|
|
|
import android.view.View;
|
|
|
|
/**
|
|
* Helper class that keeps temporary state while {LayoutManager} is filling out the empty
|
|
* space.
|
|
*/
|
|
class LayoutState {
|
|
|
|
static final int LAYOUT_START = -1;
|
|
|
|
static final int LAYOUT_END = 1;
|
|
|
|
static final int INVALID_LAYOUT = Integer.MIN_VALUE;
|
|
|
|
static final int ITEM_DIRECTION_HEAD = -1;
|
|
|
|
static final int ITEM_DIRECTION_TAIL = 1;
|
|
|
|
/**
|
|
* We may not want to recycle children in some cases (e.g. layout)
|
|
*/
|
|
boolean mRecycle = true;
|
|
|
|
/**
|
|
* Number of pixels that we should fill, in the layout direction.
|
|
*/
|
|
int mAvailable;
|
|
|
|
/**
|
|
* Current position on the adapter to get the next item.
|
|
*/
|
|
int mCurrentPosition;
|
|
|
|
/**
|
|
* Defines the direction in which the data adapter is traversed.
|
|
* Should be {@link #ITEM_DIRECTION_HEAD} or {@link #ITEM_DIRECTION_TAIL}
|
|
*/
|
|
int mItemDirection;
|
|
|
|
/**
|
|
* Defines the direction in which the layout is filled.
|
|
* Should be {@link #LAYOUT_START} or {@link #LAYOUT_END}
|
|
*/
|
|
int mLayoutDirection;
|
|
|
|
/**
|
|
* This is the target pixel closest to the start of the layout that we are trying to fill
|
|
*/
|
|
int mStartLine = 0;
|
|
|
|
/**
|
|
* This is the target pixel closest to the end of the layout that we are trying to fill
|
|
*/
|
|
int mEndLine = 0;
|
|
|
|
/**
|
|
* If true, layout should stop if a focusable view is added
|
|
*/
|
|
boolean mStopInFocusable;
|
|
|
|
/**
|
|
* If the content is not wrapped with any value
|
|
*/
|
|
boolean mInfinite;
|
|
|
|
/**
|
|
* @return true if there are more items in the data adapter
|
|
*/
|
|
boolean hasMore(RecyclerView.State state) {
|
|
return mCurrentPosition >= 0 && mCurrentPosition < state.getItemCount();
|
|
}
|
|
|
|
/**
|
|
* Gets the view for the next element that we should render.
|
|
* Also updates current item index to the next item, based on {@link #mItemDirection}
|
|
*
|
|
* @return The next element that we should render.
|
|
*/
|
|
View next(RecyclerView.Recycler recycler) {
|
|
final View view = recycler.getViewForPosition(mCurrentPosition);
|
|
mCurrentPosition += mItemDirection;
|
|
return view;
|
|
}
|
|
|
|
@Override
|
|
public String toString() {
|
|
return "LayoutState{"
|
|
+ "mAvailable=" + mAvailable
|
|
+ ", mCurrentPosition=" + mCurrentPosition
|
|
+ ", mItemDirection=" + mItemDirection
|
|
+ ", mLayoutDirection=" + mLayoutDirection
|
|
+ ", mStartLine=" + mStartLine
|
|
+ ", mEndLine=" + mEndLine
|
|
+ '}';
|
|
}
|
|
}
|