1 /* 2 * Copyright (C) 2019 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 17 package com.android.settings.widget; 18 19 import android.content.Context; 20 import android.util.AttributeSet; 21 import android.view.View; 22 23 import com.android.settings.R; 24 import com.android.settingslib.RestrictedPreference; 25 26 import androidx.annotation.VisibleForTesting; 27 import androidx.preference.PreferenceViewHolder; 28 29 /** 30 * A preference with a plus button on the side representing an "add" action. The plus button will 31 * only be visible when a non-null click listener is registered. 32 */ 33 public class AddPreference extends RestrictedPreference implements View.OnClickListener { 34 35 private OnAddClickListener mListener; 36 private View mWidgetFrame; 37 private View mAddWidget; 38 AddPreference(Context context, AttributeSet attrs)39 public AddPreference(Context context, AttributeSet attrs) { 40 super(context, attrs); 41 } 42 43 @VisibleForTesting getAddWidgetResId()44 int getAddWidgetResId() { 45 return R.id.add_preference_widget; 46 } 47 48 /** Sets a listener for clicks on the plus button. Passing null will cause the button to be 49 * hidden. */ setOnAddClickListener(OnAddClickListener listener)50 public void setOnAddClickListener(OnAddClickListener listener) { 51 mListener = listener; 52 if (mWidgetFrame != null) { 53 mWidgetFrame.setVisibility(shouldHideSecondTarget() ? View.GONE : View.VISIBLE); 54 } 55 } 56 setAddWidgetEnabled(boolean enabled)57 public void setAddWidgetEnabled(boolean enabled) { 58 if (mAddWidget != null) { 59 mAddWidget.setEnabled(enabled); 60 } 61 } 62 63 @Override getSecondTargetResId()64 protected int getSecondTargetResId() { 65 return R.layout.preference_widget_add; 66 } 67 68 @Override shouldHideSecondTarget()69 protected boolean shouldHideSecondTarget() { 70 return mListener == null; 71 } 72 73 @Override onBindViewHolder(PreferenceViewHolder holder)74 public void onBindViewHolder(PreferenceViewHolder holder) { 75 super.onBindViewHolder(holder); 76 mWidgetFrame = holder.findViewById(android.R.id.widget_frame); 77 mAddWidget = holder.findViewById(getAddWidgetResId()); 78 mAddWidget.setEnabled(true); 79 mAddWidget.setOnClickListener(this); 80 } 81 82 @Override onClick(View view)83 public void onClick(View view) { 84 if (view.getId() == getAddWidgetResId() && mListener != null) { 85 mListener.onAddClick(this); 86 } 87 } 88 89 public interface OnAddClickListener { onAddClick(AddPreference p)90 void onAddClick(AddPreference p); 91 } 92 } 93