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add support for vertical
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@BCsl
BCsl committed Dec 15, 2016
1 parent eb2abbb commit e16a4f2
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Showing 3 changed files with 117 additions and 23 deletions.
2 changes: 2 additions & 0 deletions README.md
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Expand Up @@ -6,6 +6,8 @@ Demonstrate how to custom `RecycleView#LayoutManager`

### v1.0

A LinearLayoutManager like LayoutManager, Horizontal and Vertical support.

## License

```
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6 changes: 3 additions & 3 deletions app/src/main/java/github/hellocsl/gallerylayoutmanager/MainActivity.java
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Expand Up @@ -2,7 +2,6 @@

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;
Expand Down Expand Up @@ -59,8 +58,9 @@ public void onItemClick(View view, int position) {
});
mMainRecycle1.setAdapter(demoAdapter1);

LinearLayoutManager layoutManager2 = new LinearLayoutManager(this);
layoutManager2.setOrientation(LinearLayoutManager.VERTICAL);
// LinearLayoutManager layoutManager2 = new LinearLayoutManager(this);
// layoutManager2.setOrientation(LinearLayoutManager.VERTICAL);
GalleryLayoutManager layoutManager2 = new GalleryLayoutManager(this, GalleryLayoutManager.VERTICAL);
mMainRecycle2.setLayoutManager(layoutManager2);
DemoAdapter demoAdapter2 = new DemoAdapter(title) {
@Override
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132 changes: 112 additions & 20 deletions app/src/main/java/github/hellocsl/gallerylayoutmanager/layout/GalleryLayoutManager.java
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Expand Up @@ -19,14 +19,8 @@
public class GalleryLayoutManager extends RecyclerView.LayoutManager {
private static final String TAG = "GalleryLayoutManager";
private final Context mContext;
/* Consistent size applied to all child views */
// private int mDecoratedChildWidth;
// private int mDecoratedChildHeight;

// private int mSelectionPosition = 0;
private int mFirstVisiblePosition = -1;
private int mLastVisiblePos = -1;
// private int mSelectedIndex;


public static final int HORIZONTAL = OrientationHelper.HORIZONTAL;
Expand Down Expand Up @@ -103,11 +97,103 @@ private void fillCover(RecyclerView.Recycler recycler, RecyclerView.State state,

}


/**
* @param recycler
* @param state
* @param dy
*/
private void fillWithVertical(RecyclerView.Recycler recycler, RecyclerView.State state, int dy) {
// TODO: 2016/11/19
int topEdge = getOrientationHelper().getStartAfterPadding();
int bottomEdge = getOrientationHelper().getEndAfterPadding();

//1.根据滑动方向，回收越界子View
View child;
if (getChildCount() > 0) {
if (dy >= 0) {
for (int i = 0; i < getChildCount(); i++) {
child = getChildAt(i);
if (getDecoratedBottom(child) - dy < topEdge) {
removeAndRecycleView(child, recycler);
mFirstVisiblePosition++;
} else {
break;
}
}
} else { //dy<0
for (int i = getChildCount() - 1; i >= 0; i--) {
child = getChildAt(i);
if (getDecoratedTop(child) - dy > bottomEdge) {
removeAndRecycleView(child, recycler);
mLastVisiblePos--;
}
}
}

}
//开始进行布局的位置
int startPosition = mFirstVisiblePosition;
int startOffset = -1;
int scrapWidth, scrapHeight;
Rect scrapRect = new Rect();
int width = getHorizontalSpace();
int leftOffset;
View scrap;
//2.根据不同滑动方向，为空余位置进行布局
if (dy >= 0) {
if (getChildCount() != 0) {
View lastView = getChildAt(getChildCount() - 1);
startPosition = getPosition(lastView) + 1; //下一个View的Position
startOffset = getDecoratedBottom(lastView);
}
//考虑边界和数量
for (int i = startPosition; i < getItemCount() && startOffset < bottomEdge; i++) {
scrap = recycler.getViewForPosition(i);
addView(scrap);
measureChildWithMargins(scrap, 0, 0);
scrapWidth = getDecoratedMeasuredWidth(scrap);
scrapHeight = getDecoratedMeasuredHeight(scrap);
leftOffset = (int) (getPaddingLeft() + (width - scrapWidth) / 2.0f);
if (startOffset == -1 && startPosition == 0) {
//第0个View，居中处理
int top = (int) (getPaddingLeft() + (getHorizontalSpace() - scrapWidth) / 2.f);
scrapRect.set(leftOffset, top, leftOffset + scrapWidth, top + scrapHeight);
} else {
scrapRect.set(leftOffset, startOffset, leftOffset + scrapWidth, startOffset + scrapHeight);
}
layoutDecorated(scrap, scrapRect.left, scrapRect.top, scrapRect.right, scrapRect.bottom);
startOffset = scrapRect.bottom;
((LayoutParams) scrap.getLayoutParams()).mPosition = i;
mLastVisiblePos = i;
getState().mItemsFrames.put(i, scrapRect);
if (BuildConfig.DEBUG) {
Log.d(TAG, "fillWithHorizontal,layout:mLastVisiblePos: " + mLastVisiblePos);
}
}
} else {
//dy<0
if (getChildCount() > 0) {
View firstView = getChildAt(0);
startPosition = getPosition(firstView) - 1; //前一个View的position
startOffset = getDecoratedTop(firstView);
}
//考虑边界和数量
for (int i = startPosition; i >= 0 && startOffset > topEdge; i--) {
scrapRect = getState().mItemsFrames.get(i);
scrap = recycler.getViewForPosition(i);
addView(scrap, 0);
measureChildWithMargins(scrap, 0, 0);
scrapWidth = scrapRect.right - scrapRect.left;
scrapHeight = scrapRect.bottom - scrapRect.top;
leftOffset = (int) (getPaddingLeft() + (width - scrapWidth) / 2.0f);
layoutDecorated(scrap, leftOffset, startOffset - scrapHeight, leftOffset + scrapWidth, startOffset);
startOffset -= scrapHeight;
((LayoutParams) scrap.getLayoutParams()).mPosition = i;
mFirstVisiblePosition = i;
}
}
}


/**
* @param recycler
* @param state
Expand Down Expand Up @@ -247,13 +333,9 @@ class State {
*/
int mScrollDelta;

int mInitOffset;


public State() {
mItemsFrames = new SparseArray<Rect>();
mScrollDelta = 0;
mInitOffset = 0;
}
}

Expand Down Expand Up @@ -303,17 +385,27 @@ public int scrollHorizontallyBy(int dx, RecyclerView.Recycler recycler, Recycler

@Override
public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler, RecyclerView.State state) {
if (getChildCount() == 0) {
if (getChildCount() == 0 || dy == 0) {
return 0;
}
final View topView = getChildAt(0);
final View bottomView = getChildAt(getChildCount() - 1);

int viewSpan = getDecoratedBottom(bottomView) - getDecoratedTop(topView);
if (viewSpan < getVerticalSpace()) {
return 0;
int delta = -dy;
int parentCenter = (getOrientationHelper().getEndAfterPadding() - getOrientationHelper().getStartAfterPadding()) / 2 + getOrientationHelper().getStartAfterPadding();
View child;
if (dy > 0) { //手势左滑
if (((LayoutParams) getChildAt(getChildCount() - 1).getLayoutParams()).mPosition == getItemCount() - 1) {
child = getChildAt(getChildCount() - 1);
delta = -Math.max(0, Math.min(dy, (child.getBottom() - child.getTop()) / 2 + child.getTop() - parentCenter));
}
} else {
if (mFirstVisiblePosition == 0) {
child = getChildAt(0);
delta = -Math.min(0, Math.max(dy, ((child.getBottom() - child.getTop()) / 2 + child.getTop()) - parentCenter));
}
}
return super.scrollVerticallyBy(dy, recycler, state);
getState().mScrollDelta = -delta;
fillCover(recycler, state, -delta);
offsetChildrenVertical(delta);
return -delta;
}

private OrientationHelper getOrientationHelper() {
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