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Merge pull request #2492 from candyguy242/master
增加对section设定间距后，条目宽度自适应的功能
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146 changes: 146 additions & 0 deletions
146
...om/chad/baserecyclerviewadapterhelper/decoration/GridSectionAverageGapItemDecoration.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| package com.chad.baserecyclerviewadapterhelper.decoration; | ||
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| import android.graphics.Rect; | ||
| import android.support.v7.widget.GridLayoutManager; | ||
| import android.support.v7.widget.RecyclerView; | ||
| import android.util.DisplayMetrics; | ||
| import android.util.TypedValue; | ||
| import android.view.View; | ||
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| import com.chad.library.adapter.base.BaseQuickAdapter; | ||
| import com.chad.library.adapter.base.BaseSectionQuickAdapter; | ||
| import com.chad.library.adapter.base.BaseViewHolder; | ||
| import com.chad.library.adapter.base.entity.SectionEntity; | ||
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| /** | ||
| * 应用于RecyclerView的GridLayoutManager，水平方向上固定间距大小，从而使条目宽度自适应。<br> | ||
| * 配合Brvah的Section使用，不对Head生效，仅对每个Head的子Grid列表生效<br> | ||
| *Section Grid中Item的宽度应设为MATCH_PARAENT | ||
| * | ||
| * @author : renpeng | ||
| * @org :Aurora Team | ||
| * @since : 2018/9/29 | ||
| */ | ||
| public class GridSectionAverageGapItemDecoration extends RecyclerView.ItemDecoration { | ||
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| private float gapHorizontalDp; | ||
| private float gapVerticalDp; | ||
| private float sectionEdgeHPaddingDp; | ||
| private float sectionEdgeVPaddingDp; | ||
| private int gapHSizePx = -1; | ||
| private int gapVSizePx = -1; | ||
| private int sectionEdgeHPaddingPx; | ||
| private int eachItemHPaddingPx; //每个条目应该在水平方向上加的padding 总大小，即=paddingLeft+paddingRight | ||
| private int sectionEdgeVPaddingPx; | ||
| private Rect preRect = new Rect(); | ||
| private boolean isPreItemHeader = false; | ||
| private int sectionStartItemPos = 0; | ||
| private int sectionEndItemPos = 0; | ||
| private int sectionItemCount = 0; | ||
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| /** | ||
| * @param gapHorizontalDp 水平间距 | ||
| * @param gapVerticalDp 垂直间距 | ||
| * @param sectionEdgeHPaddingDp 左右两端的padding大小 | ||
| * @param sectionEdgeVPaddingDp 上下两端的padding大小 | ||
| */ | ||
| public GridSectionAverageGapItemDecoration(float gapHorizontalDp, float gapVerticalDp, float sectionEdgeHPaddingDp, float sectionEdgeVPaddingDp) { | ||
| this.gapHorizontalDp = gapHorizontalDp; | ||
| this.gapVerticalDp = gapVerticalDp; | ||
| this.sectionEdgeHPaddingDp = sectionEdgeHPaddingDp; | ||
| this.sectionEdgeVPaddingDp = sectionEdgeVPaddingDp; | ||
| } | ||
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| @Override | ||
| public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { | ||
| if (parent.getLayoutManager() instanceof GridLayoutManager && parent.getAdapter() instanceof BaseSectionQuickAdapter) { | ||
| GridLayoutManager layoutManager = (GridLayoutManager) parent.getLayoutManager(); | ||
| BaseSectionQuickAdapter<SectionEntity, BaseViewHolder> adapter = (BaseSectionQuickAdapter) parent.getAdapter(); | ||
| int spanCount = layoutManager.getSpanCount(); | ||
| int position = parent.getChildAdapterPosition(view); | ||
| SectionEntity entity = adapter.getItem(position); | ||
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| if (entity != null && entity.isHeader) { | ||
| //不处理header | ||
| isPreItemHeader = true; | ||
| outRect.set(0,0,0,0); | ||
| // Log.w("GridAverageGapItem", "pos=" + position + "," + outRect.toShortString()); | ||
| return; | ||
| } | ||
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| if (isPreItemHeader) { | ||
| sectionStartItemPos = position; | ||
| sectionEndItemPos = findSectionLastItemPos(position, adapter); | ||
| sectionItemCount = sectionEndItemPos - sectionStartItemPos + 1; | ||
| // Log.w("GridAverageGapItem", "new section=" + sectionStartItemPos + "-" + sectionEndItemPos); | ||
| } | ||
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| if (gapHSizePx < 0 || gapVSizePx < 0) { | ||
| transformGapDefinition(parent, spanCount); | ||
| } | ||
| outRect.top = gapVSizePx; | ||
| outRect.bottom = 0; | ||
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| //下面的visualPos为单个Section内的视觉Pos | ||
| int visualPos = position + 1 - sectionStartItemPos; | ||
| if (visualPos % spanCount == 1) { | ||
| //第一列 | ||
| outRect.left = sectionEdgeHPaddingPx; | ||
| outRect.right = eachItemHPaddingPx - sectionEdgeHPaddingPx; | ||
| } else if (visualPos % spanCount == 0) { | ||
| //最后一列 | ||
| outRect.left = eachItemHPaddingPx - sectionEdgeHPaddingPx; | ||
| outRect.right = sectionEdgeHPaddingPx; | ||
| } else { | ||
| outRect.left = gapHSizePx - preRect.right; | ||
| outRect.right = eachItemHPaddingPx - outRect.left; | ||
| } | ||
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| if (visualPos - spanCount <= 0) { | ||
| //每个section的第一行 | ||
| outRect.top = sectionEdgeVPaddingPx; | ||
| } | ||
| //存在即是第一行，又是最后一行的情况，故不用elseif | ||
| if (isLastRow(visualPos, spanCount, sectionItemCount)) { | ||
| //每个section的最后一行 | ||
| outRect.bottom = sectionEdgeVPaddingPx; | ||
| } | ||
| preRect = new Rect(outRect); | ||
| isPreItemHeader = false; | ||
| // Log.w("GridAverageGapItem", "pos=" + position + "," + outRect.toShortString()); | ||
| } else { | ||
| super.getItemOffsets(outRect, view, parent, state); | ||
| } | ||
| } | ||
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| private void transformGapDefinition(RecyclerView parent, int spanCount) { | ||
| DisplayMetrics displayMetrics = new DisplayMetrics(); | ||
| parent.getDisplay().getMetrics(displayMetrics); | ||
| gapHSizePx = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, gapHorizontalDp, displayMetrics); | ||
| gapVSizePx = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, gapVerticalDp, displayMetrics); | ||
| sectionEdgeHPaddingPx = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, sectionEdgeHPaddingDp, displayMetrics); | ||
| sectionEdgeVPaddingPx = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, sectionEdgeVPaddingDp, displayMetrics); | ||
| eachItemHPaddingPx = (sectionEdgeHPaddingPx * 2 + gapHSizePx * (spanCount - 1)) / spanCount; | ||
| } | ||
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| private int findSectionLastItemPos(int curPos, BaseQuickAdapter<SectionEntity, BaseViewHolder> adapter) { | ||
| int count = adapter.getItemCount(); | ||
| if (count == curPos + 1) { | ||
| return curPos; | ||
| } | ||
| SectionEntity sectionEntity = null; | ||
| for (int i = curPos + 1; i < count; i++) { | ||
| sectionEntity = adapter.getItem(i); | ||
| if (sectionEntity != null && sectionEntity.isHeader) { | ||
| return i - 1; | ||
| } | ||
| } | ||
| return count - 1; | ||
| } | ||
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| private boolean isLastRow(int visualPos, int spanCount, int sectionItemCount) { | ||
| int lastRowCount = sectionItemCount % spanCount; | ||
| lastRowCount = lastRowCount == 0 ? spanCount : lastRowCount; | ||
| return visualPos > sectionItemCount - lastRowCount; | ||
| } | ||
| } |
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