From e16a4f2321b71acea1d846dedf54158c91bb3fcf Mon Sep 17 00:00:00 2001 From: HelloCsl <664867596@qq.com> Date: Thu, 15 Dec 2016 16:06:43 +0800 Subject: [PATCH] add support for vertical --- README.md | 2 + .../gallerylayoutmanager/MainActivity.java | 6 +- .../layout/GalleryLayoutManager.java | 132 +++++++++++++++--- 3 files changed, 117 insertions(+), 23 deletions(-) diff --git a/README.md b/README.md index 494924f..4f66274 100644 --- a/README.md +++ b/README.md @@ -6,6 +6,8 @@ Demonstrate how to custom `RecycleView#LayoutManager` ### v1.0 +A LinearLayoutManager like LayoutManager, Horizontal and Vertical support. + ## License ``` diff --git a/app/src/main/java/github/hellocsl/gallerylayoutmanager/MainActivity.java b/app/src/main/java/github/hellocsl/gallerylayoutmanager/MainActivity.java index 2f9593c..4e3e985 100644 --- a/app/src/main/java/github/hellocsl/gallerylayoutmanager/MainActivity.java +++ b/app/src/main/java/github/hellocsl/gallerylayoutmanager/MainActivity.java @@ -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; @@ -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 diff --git a/app/src/main/java/github/hellocsl/gallerylayoutmanager/layout/GalleryLayoutManager.java b/app/src/main/java/github/hellocsl/gallerylayoutmanager/layout/GalleryLayoutManager.java index 5f3fde4..b7780f4 100644 --- a/app/src/main/java/github/hellocsl/gallerylayoutmanager/layout/GalleryLayoutManager.java +++ b/app/src/main/java/github/hellocsl/gallerylayoutmanager/layout/GalleryLayoutManager.java @@ -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; @@ -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 @@ -247,13 +333,9 @@ class State { */ int mScrollDelta; - int mInitOffset; - - public State() { mItemsFrames = new SparseArray(); mScrollDelta = 0; - mInitOffset = 0; } } @@ -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() {