Activity data dividers #4294
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,122 @@ | ||
| /* | ||
| * Nextcloud Android client application | ||
| * | ||
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| * Copyright (C) 2019 Sevastyan Savanyuk | ||
| * Copyright (C) 2019 Nextcloud GmbH | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
| package com.owncloud.android.ui.activities; | ||
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| import android.graphics.Canvas; | ||
| import android.graphics.Color; | ||
| import android.view.LayoutInflater; | ||
| import android.view.View; | ||
| import android.view.ViewGroup; | ||
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| import com.owncloud.android.ui.adapter.StickyHeaderAdapter; | ||
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| import androidx.annotation.NonNull; | ||
| import androidx.recyclerview.widget.RecyclerView; | ||
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| public class StickyHeaderItemDecoration extends RecyclerView.ItemDecoration { | ||
| private final StickyHeaderAdapter adapter; | ||
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| public StickyHeaderItemDecoration(StickyHeaderAdapter stickyHeaderAdapter) { | ||
| this.adapter = stickyHeaderAdapter; | ||
| } | ||
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| @Override | ||
| public void onDrawOver(@NonNull Canvas canvas, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) { | ||
| super.onDrawOver(canvas, parent, state); | ||
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| View topChild = parent.getChildAt(0); | ||
| if (topChild == null) { | ||
| return; | ||
| } | ||
| int topChildPosition = parent.getChildAdapterPosition(topChild); | ||
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| if (topChildPosition == RecyclerView.NO_POSITION) { | ||
| return; | ||
| } | ||
| View currentHeader = getHeaderViewForItem(topChildPosition, parent); | ||
| fixLayoutSize(parent, currentHeader); | ||
| int contactPoint = currentHeader.getBottom(); | ||
| View childInContact = getChildInContact(parent, contactPoint); | ||
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| if (childInContact == null) { | ||
| return; | ||
| } | ||
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| if (adapter.isHeader(parent.getChildAdapterPosition(childInContact))) { | ||
| moveHeader(canvas, currentHeader, childInContact); | ||
| return; | ||
| } | ||
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| drawHeader(canvas, currentHeader); | ||
| } | ||
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| private void drawHeader(Canvas canvas, View header) { | ||
| canvas.save(); | ||
| canvas.translate(0, 0); | ||
| header.draw(canvas); | ||
| canvas.restore(); | ||
| } | ||
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| private void moveHeader(Canvas canvas, View currentHeader, View nextHeader) { | ||
| canvas.save(); | ||
| canvas.translate(0, nextHeader.getTop() - currentHeader.getHeight()); | ||
| currentHeader.draw(canvas); | ||
| canvas.restore(); | ||
| } | ||
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| private View getChildInContact(RecyclerView parent, int contactPoint) { | ||
| View childInContact = null; | ||
| for (int i = 0; i < parent.getChildCount(); i++) { | ||
| View currentChild = parent.getChildAt(i); | ||
| if (currentChild.getBottom() > contactPoint && currentChild.getTop() <= contactPoint) { | ||
| childInContact = currentChild; | ||
| break; | ||
| } | ||
| } | ||
| return childInContact; | ||
| } | ||
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| private View getHeaderViewForItem(int itemPosition, RecyclerView parent) { | ||
| int headerPosition = adapter.getHeaderPositionForItem(itemPosition); | ||
| int layoutId = adapter.getHeaderLayout(itemPosition); | ||
| View header = LayoutInflater.from(parent.getContext()).inflate(layoutId, parent, false); | ||
| header.setBackgroundColor(Color.WHITE); | ||
| adapter.bindHeaderData(header, headerPosition); | ||
| return header; | ||
| } | ||
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| private void fixLayoutSize(ViewGroup parent, View view) { | ||
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| // Specs for parent (RecyclerView) | ||
| int widthSpec = View.MeasureSpec.makeMeasureSpec(parent.getWidth(), View.MeasureSpec.EXACTLY); | ||
| int heightSpec = View.MeasureSpec.makeMeasureSpec(parent.getHeight(), View.MeasureSpec.UNSPECIFIED); | ||
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| // Specs for children (headers) | ||
| int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec, parent.getPaddingLeft() + parent.getPaddingRight(), view.getLayoutParams().width); | ||
| int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec, parent.getPaddingTop() + parent.getPaddingBottom(), view.getLayoutParams().height); | ||
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| view.measure(childWidthSpec, childHeightSpec); | ||
| view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight()); | ||
| } | ||
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| /* | ||
| * Nextcloud Android client application | ||
| * | ||
|
|
||
| * Copyright (C) 2019 Sevastyan Savanyuk | ||
| * Copyright (C) 2019 Nextcloud GmbH | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
| package com.owncloud.android.ui.adapter; | ||
|
Member
There was a problem hiding this comment. Also licence here, please |
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| import android.view.View; | ||
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| import com.owncloud.android.ui.activities.StickyHeaderItemDecoration; | ||
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| public interface StickyHeaderAdapter { | ||
| /** | ||
| * This method gets called by {@link StickyHeaderItemDecoration} to fetch the position of the header item in the adapter | ||
| * that is used for (represents) item at specified position. | ||
| * @param itemPosition int. Adapter's position of the item for which to do the search of the position of the header item. | ||
| * @return int. Position of the header item in the adapter. | ||
| */ | ||
| int getHeaderPositionForItem(int itemPosition); | ||
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| /** | ||
| * This method gets called by {@link StickyHeaderItemDecoration} to get layout resource id for the header item at specified adapter's position. | ||
| * @param headerPosition int. Position of the header item in the adapter. | ||
| * @return int. Layout resource id. | ||
| */ | ||
| int getHeaderLayout(int headerPosition); | ||
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| /** | ||
| * This method gets called by {@link StickyHeaderItemDecoration} to setup the header View. | ||
| * @param header View. Header to set the data on. | ||
| * @param headerPosition int. Position of the header item in the adapter. | ||
| */ | ||
| void bindHeaderData(View header, int headerPosition); | ||
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| /** | ||
| * This method gets called by {@link StickyHeaderItemDecoration} to verify whether the item represents a header. | ||
| * @param itemPosition int. | ||
| * @return true, if item at the specified adapter's position represents a header. | ||
| */ | ||
| boolean isHeader(int itemPosition); | ||
| } | ||
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I always have trouble reading do while loops, as they are so rarely used.
Can this maybe transformed in a regular while loop?