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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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.
*/
package com.android.setupwizardlib.template;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Build.VERSION_CODES;
import android.util.AttributeSet;
import android.view.View;
import android.widget.HeaderViewListAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import androidx.annotation.AttrRes;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.android.setupwizardlib.R;
import com.android.setupwizardlib.TemplateLayout;
import com.android.setupwizardlib.items.ItemAdapter;
import com.android.setupwizardlib.items.ItemGroup;
import com.android.setupwizardlib.items.ItemInflater;
import com.android.setupwizardlib.util.DrawableLayoutDirectionHelper;
/**
* A {@link Mixin} for interacting with ListViews.
*/
public class ListMixin implements Mixin {
private TemplateLayout mTemplateLayout;
@Nullable
private ListView mListView;
private Drawable mDivider;
private Drawable mDefaultDivider;
private int mDividerInsetStart;
private int mDividerInsetEnd;
/**
* @param layout The layout this mixin belongs to.
*/
public ListMixin(@NonNull TemplateLayout layout, @Nullable AttributeSet attrs,
@AttrRes int defStyleAttr) {
mTemplateLayout = layout;
final Context context = layout.getContext();
final TypedArray a = context.obtainStyledAttributes(
attrs, R.styleable.SuwListMixin, defStyleAttr, 0);
final int entries = a.getResourceId(R.styleable.SuwListMixin_android_entries, 0);
if (entries != 0) {
final ItemGroup inflated =
(ItemGroup) new ItemInflater(context).inflate(entries);
setAdapter(new ItemAdapter(inflated));
}
int dividerInset =
a.getDimensionPixelSize(R.styleable.SuwListMixin_suwDividerInset, -1);
if (dividerInset != -1) {
setDividerInset(dividerInset);
} else {
int dividerInsetStart =
a.getDimensionPixelSize(R.styleable.SuwListMixin_suwDividerInsetStart, 0);
int dividerInsetEnd =
a.getDimensionPixelSize(R.styleable.SuwListMixin_suwDividerInsetEnd, 0);
setDividerInsets(dividerInsetStart, dividerInsetEnd);
}
a.recycle();
}
/**
* @return The list view contained in the layout, as marked by {@code @android:id/list}. This
* will return {@code null} if the list doesn't exist in the layout.
*/
public ListView getListView() {
return getListViewInternal();
}
// Client code can assume getListView() will not be null if they know their template contains
// the list, but this mixin cannot. Any usages of getListView in this mixin needs null checks.
@Nullable
private ListView getListViewInternal() {
if (mListView == null) {
final View list = mTemplateLayout.findManagedViewById(android.R.id.list);
if (list instanceof ListView) {
mListView = (ListView) list;
}
}
return mListView;
}
/**
* List mixin needs to update the dividers if the layout direction has changed. This method
* should be called when {@link View#onLayout(boolean, int, int, int, int)} of the template
* is called.
*/
public void onLayout() {
if (mDivider == null) {
// Update divider in case layout direction has just been resolved
updateDivider();
}
}
/**
* Gets the adapter of the list view in this layout. If the adapter is a HeaderViewListAdapter,
* this method will unwrap it and return the underlying adapter.
*
* @return The adapter, or {@code null} if there is no list, or if the list has no adapter.
*/
public ListAdapter getAdapter() {
final ListView listView = getListViewInternal();
if (listView != null) {
final ListAdapter adapter = listView.getAdapter();
if (adapter instanceof HeaderViewListAdapter) {
return ((HeaderViewListAdapter) adapter).getWrappedAdapter();
}
return adapter;
}
return null;
}
/**
* Sets the adapter on the list view in this layout.
*/
public void setAdapter(ListAdapter adapter) {
final ListView listView = getListViewInternal();
if (listView != null) {
listView.setAdapter(adapter);
}
}
/**
* @deprecated Use {@link #setDividerInsets(int, int)} instead.
*/
@Deprecated
public void setDividerInset(int inset) {
setDividerInsets(inset, 0);
}
/**
* Sets the start inset of the divider. This will use the default divider drawable set in the
* theme and apply insets to it.
*
* @param start The number of pixels to inset on the "start" side of the list divider. Typically
* this will be either {@code @dimen/suw_items_glif_icon_divider_inset} or
* {@code @dimen/suw_items_glif_text_divider_inset}.
* @param end The number of pixels to inset on the "end" side of the list divider.
*/
public void setDividerInsets(int start, int end) {
mDividerInsetStart = start;
mDividerInsetEnd = end;
updateDivider();
}
/**
* @return The number of pixels inset on the start side of the divider.
* @deprecated This is the same as {@link #getDividerInsetStart()}. Use that instead.
*/
@Deprecated
public int getDividerInset() {
return getDividerInsetStart();
}
/**
* @return The number of pixels inset on the start side of the divider.
*/
public int getDividerInsetStart() {
return mDividerInsetStart;
}
/**
* @return The number of pixels inset on the end side of the divider.
*/
public int getDividerInsetEnd() {
return mDividerInsetEnd;
}
private void updateDivider() {
final ListView listView = getListViewInternal();
if (listView == null) {
return;
}
boolean shouldUpdate = true;
if (Build.VERSION.SDK_INT >= VERSION_CODES.KITKAT) {
shouldUpdate = mTemplateLayout.isLayoutDirectionResolved();
}
if (shouldUpdate) {
if (mDefaultDivider == null) {
mDefaultDivider = listView.getDivider();
}
mDivider = DrawableLayoutDirectionHelper.createRelativeInsetDrawable(
mDefaultDivider,
mDividerInsetStart /* start */,
0 /* top */,
mDividerInsetEnd /* end */,
0 /* bottom */,
mTemplateLayout);
listView.setDivider(mDivider);
}
}
/**
* @return The drawable used as the divider.
*/
public Drawable getDivider() {
return mDivider;
}
}
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