LargeTemplateView.java revision f27b1ffc67228d73326ec3426fef4c9db75cd6fd 
1/*
2 * Copyright 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package androidx.slice.widget;
18
19import android.content.Context;
20import android.support.annotation.RestrictTo;
21import android.support.v7.widget.LinearLayoutManager;
22import android.support.v7.widget.RecyclerView;
23import android.util.AttributeSet;
24
25import java.util.ArrayList;
26import java.util.List;
27
28import androidx.slice.Slice;
29import androidx.slice.SliceItem;
30
31/**
32 * @hide
33 */
34@RestrictTo(RestrictTo.Scope.LIBRARY)
35public class LargeTemplateView extends SliceChildView {
36
37    private final LargeSliceAdapter mAdapter;
38    private final RecyclerView mRecyclerView;
39    private Slice mSlice;
40    private boolean mIsScrollable;
41    private ListContent mListContent;
42    private List<SliceItem> mDisplayedItems = new ArrayList<>();
43    private int mDisplayedItemsHeight = 0;
44
45    public LargeTemplateView(Context context) {
46        super(context);
47        mRecyclerView = new RecyclerView(getContext());
48        mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
49        mAdapter = new LargeSliceAdapter(context);
50        mRecyclerView.setAdapter(mAdapter);
51        addView(mRecyclerView);
52    }
53
54    @Override
55    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
56        int height = MeasureSpec.getSize(heightMeasureSpec);
57        if (mDisplayedItems.size() > 0 && mDisplayedItemsHeight > height) {
58            // Need to resize
59            updateDisplayedItems(height);
60        }
61        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
62    }
63
64    @Override
65    public int getActualHeight() {
66        return mDisplayedItemsHeight;
67    }
68
69    @Override
70    public void setTint(int tint) {
71        super.setTint(tint);
72        populate();
73    }
74
75    @Override
76    public @SliceView.SliceMode int getMode() {
77        return SliceView.MODE_LARGE;
78    }
79
80    @Override
81    public void setSliceActionListener(SliceView.OnSliceActionListener observer) {
82        mObserver = observer;
83        if (mAdapter != null) {
84            mAdapter.setSliceObserver(mObserver);
85        }
86    }
87
88    @Override
89    public void setSliceActions(List<SliceItem> actions) {
90        mAdapter.setSliceActions(actions);
91    }
92
93    @Override
94    public void setSlice(Slice slice) {
95        mSlice = slice;
96        populate();
97    }
98
99    @Override
100    public void setStyle(AttributeSet attrs) {
101        super.setStyle(attrs);
102        mAdapter.setStyle(attrs);
103    }
104
105    private void populate() {
106        if (mSlice == null) {
107            resetView();
108            return;
109        }
110        mListContent = new ListContent(getContext(), mSlice);
111        updateDisplayedItems(getMeasuredHeight());
112    }
113
114    /**
115     * Whether or not the content in this template should be scrollable.
116     */
117    public void setScrollable(boolean isScrollable) {
118        mIsScrollable = isScrollable;
119        updateDisplayedItems(getMeasuredHeight());
120    }
121
122    private void updateDisplayedItems(int height) {
123        if (mListContent == null) {
124            return;
125        }
126        if (!mIsScrollable) {
127            // If we're not scrollable we must cap the number of items we're displaying such
128            // that they fit in the available space
129            if (height == 0) {
130                // Not measured, use default
131                mDisplayedItems = mListContent.getItemsForNonScrollingList(-1);
132            } else {
133                mDisplayedItems = mListContent.getItemsForNonScrollingList(height);
134            }
135        } else {
136            mDisplayedItems = mListContent.getRowItems();
137        }
138        mDisplayedItemsHeight = ListContent.getListHeight(getContext(), mDisplayedItems);
139        mAdapter.setSliceItems(mDisplayedItems, mTintColor);
140    }
141
142    @Override
143    public void resetView() {
144        mSlice = null;
145        mDisplayedItemsHeight = 0;
146        mDisplayedItems.clear();
147        mAdapter.setSliceItems(null, -1);
148        mListContent = null;
149    }
150}
151