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Forked fromshawnlinboy/BlankItemDecoration.kt
CreatedDecember 23, 2023 03:13
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An ItemDecoration implementation which provides functionality that add extra blank space between list items.
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| /* | |
| * Copyright (C) 2019 Shen Lin | |
| * | |
| * 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. | |
| */ | |
| importandroid.graphics.Rect | |
| importandroid.view.View | |
| importandroidx.recyclerview.widget.RecyclerView | |
| /** | |
| * An [RecyclerView.ItemDecoration] implementation which provides | |
| * functionality that add extra blank space between list items. | |
| * | |
| * @param spaceHeight The empty space height between two items. | |
| * @param orientation Layout orientation. Should be [BlankItemDecoration.HORIZONTAL] or [BlankItemDecoration.VERTICAL] | |
| * @param firstItemPaddingStart Pass non-zero value if first item need a paddingStart | |
| * @param lastItemPaddingEnd Pass non-zero value if last item need a paddingEnd | |
| */ | |
| classBlankItemDecoration( | |
| privatevalorientation:Int =VERTICAL, | |
| privatevalspaceHeight:Int =0, | |
| privatevalfirstItemPaddingStart:Int =0, | |
| privatevallastItemPaddingEnd:Int =0, | |
| ) : RecyclerView.ItemDecoration() { | |
| companionobject { | |
| constvalHORIZONTAL=0 | |
| constvalVERTICAL=1 | |
| } | |
| init { | |
| if (orientation!=HORIZONTAL&& orientation!=VERTICAL) { | |
| throwIllegalArgumentException("invalid orientation:$orientation") | |
| } | |
| } | |
| overridefungetItemOffsets( | |
| outRect:Rect,view:View,parent:RecyclerView, | |
| state:RecyclerView.State, | |
| ) { | |
| if (parent.adapter!=null) { | |
| val totalItemCount= parent.adapter?.itemCount?:0 | |
| val itemPosition= parent.getChildAdapterPosition(view) | |
| if (itemPosition!= totalItemCount-1) { | |
| //For all the items except the last one | |
| with(spaceHeight) { | |
| when (orientation) { | |
| HORIZONTAL-> outRect.right=this | |
| VERTICAL-> outRect.bottom=this | |
| } | |
| } | |
| //This is the first item | |
| if (itemPosition==0) { | |
| drawFirstItemPadding(outRect) | |
| } | |
| }else { | |
| //This is the last, or the first item if total item count is 1 | |
| if (totalItemCount==1) { | |
| drawFirstItemPadding(outRect) | |
| } | |
| drawLastPaddingEnd(outRect) | |
| } | |
| }else { | |
| super.getItemOffsets(outRect, view, parent, state) | |
| } | |
| } | |
| privatefundrawLastPaddingEnd(outRect:Rect?) { | |
| if (lastItemPaddingEnd!=0) { | |
| with(lastItemPaddingEnd) { | |
| when (orientation) { | |
| HORIZONTAL-> outRect?.right=this | |
| VERTICAL-> outRect?.bottom=this | |
| } | |
| } | |
| } | |
| } | |
| privatefundrawFirstItemPadding(outRect:Rect?) { | |
| if (firstItemPaddingStart!=0) { | |
| with(firstItemPaddingStart) { | |
| when (orientation) { | |
| HORIZONTAL-> outRect?.left=this | |
| VERTICAL-> outRect?.top=this | |
| } | |
| } | |
| } | |
| } | |
| } |
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