| /* |
| * Copyright (C) 2020 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.settings.accessibility; |
| |
| import android.content.Context; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import android.view.ViewTreeObserver; |
| import android.widget.FrameLayout; |
| import android.widget.ListView; |
| |
| import androidx.preference.Preference; |
| import androidx.preference.PreferenceViewHolder; |
| |
| import com.android.settings.R; |
| |
| /** Preference that easier preview by matching name to color. */ |
| public class PaletteListPreference extends Preference { |
| |
| private ListView mListView; |
| private ViewTreeObserver.OnPreDrawListener mPreDrawListener; |
| |
| /** |
| * Constructs a new PaletteListPreference with the given context's theme and the supplied |
| * attribute set. |
| * |
| * @param context The Context this is associated with, through which it can access the current |
| * theme, resources, etc. |
| * @param attrs The attributes of the XML tag that is inflating the view. |
| */ |
| public PaletteListPreference(Context context, AttributeSet attrs) { |
| this(context, attrs, 0); |
| } |
| |
| /** |
| * Constructs a new PaletteListPreference with the given context's theme, the supplied |
| * attribute set, and default style attribute. |
| * |
| * @param context The Context this is associated with, through which it can access the |
| * current theme, resources, etc. |
| * @param attrs The attributes of the XML tag that is inflating the view. |
| * @param defStyleAttr An attribute in the current theme that contains a reference to a style |
| * resource that supplies default |
| * values for the view. Can be 0 to not look for |
| * defaults. |
| */ |
| public PaletteListPreference(Context context, AttributeSet attrs, int defStyleAttr) { |
| super(context, attrs, defStyleAttr); |
| setLayoutResource(R.layout.daltonizer_preview); |
| initPreDrawListener(); |
| } |
| |
| @Override |
| public void onBindViewHolder(PreferenceViewHolder holder) { |
| super.onBindViewHolder(holder); |
| |
| final View rootView = holder.itemView; |
| mListView = rootView.findViewById(R.id.palette_listView); |
| if (mPreDrawListener != null) { |
| mListView.getViewTreeObserver().addOnPreDrawListener(mPreDrawListener); |
| } |
| } |
| |
| private void initPreDrawListener() { |
| mPreDrawListener = new ViewTreeObserver.OnPreDrawListener() { |
| @Override |
| public boolean onPreDraw() { |
| if (mListView == null) { |
| return false; |
| } |
| |
| final int listViewHeight = mListView.getMeasuredHeight(); |
| final int listViewWidth = mListView.getMeasuredWidth(); |
| |
| // Removes the callback after get result of measure view. |
| final ViewTreeObserver viewTreeObserver = mListView.getViewTreeObserver(); |
| if (viewTreeObserver.isAlive()) { |
| viewTreeObserver.removeOnPreDrawListener(this); |
| } |
| mPreDrawListener = null; |
| |
| // Resets layout parameters to display whole items from listView. |
| final FrameLayout.LayoutParams layoutParams = |
| (FrameLayout.LayoutParams) mListView.getLayoutParams(); |
| layoutParams.height = listViewHeight * mListView.getAdapter().getCount(); |
| layoutParams.width = listViewWidth; |
| mListView.setLayoutParams(layoutParams); |
| |
| return true; |
| } |
| }; |
| } |
| } |