/* * Copyright 2018 Jean-Baptiste VINCEY. * * 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.jbvincey.nestedradiobutton; import android.content.Context; import android.content.res.TypedArray; import android.support.annotation.IdRes; import android.support.annotation.NonNull; import android.support.v7.widget.AppCompatRadioButton; import android.util.AttributeSet; import android.view.View; /** * Created by jean-baptistevincey on 09/01/2018. * * <p> * A radio button is a two-states button that can be either checked or * unchecked. When the radio button is unchecked, the user can press or click it * to check it. However, contrary to a {@link android.widget.CheckBox}, a radio * button cannot be unchecked by the user once checked. * </p> * * <p> * Radio buttons are normally used together in a * {@link android.widget.RadioGroup}. When several radio buttons live inside * a radio group, checking one radio button unchecks all the others.</p> * </p> * * <p>See the <a href="{@docRoot}guide/topics/ui/controls/radiobutton.html">Radio Buttons</a> * guide.</p> * * The difference with RadioButton is that NestedRadioButton allows to have any number of ViewGroup * intermediates between your NestedRadioButton and NestedRadioGroup. */ public class NestedRadioButton extends AppCompatRadioButton { private @IdRes int clickableParentIdRes = View.NO_ID; public NestedRadioButton(@NonNull Context context) { super(context); } public NestedRadioButton(@NonNull Context context, @NonNull AttributeSet attrs) { super(context, attrs); initAttr(context, attrs); } public NestedRadioButton(@NonNull Context context, @NonNull AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initAttr(context, attrs); } private void initAttr(@NonNull Context context, @NonNull AttributeSet attrs) { // retrieve selected radio button as requested by the user in the // XML layout file TypedArray attributes = context.obtainStyledAttributes(attrs, R.styleable.NestedRadioButton); clickableParentIdRes = attributes.getResourceId(R.styleable.NestedRadioButton_clickableParent, View.NO_ID); attributes.recycle(); } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); int id = getId(); // generates an id if it's missing if (id == View.NO_ID) { id = View.generateViewId(); setId(id); } attachToParentNestedRadioGroup((View) getParent()); if(clickableParentIdRes != View.NO_ID) { attachClickableParent((View) getParent()); } } private void attachClickableParent(View view) { if(view != null) { if(view.getId() == clickableParentIdRes) { view.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { NestedRadioButton.this.setChecked(true); } }); } else if(view.getParent() instanceof View) { attachClickableParent((View) view.getParent()); } } } private void attachToParentNestedRadioGroup(View view) { if(view == null) { throw new ClassCastException("NestedRadioButton should be under a NestedRadioGroup"); } else if(view instanceof NestedRadioGroupInterface) { ((NestedRadioGroupInterface) view).addNestedRadioButton(this); } else if(view.getParent() instanceof View){ attachToParentNestedRadioGroup((View) view.getParent()); } else { throw new ClassCastException("NestedRadioButton should be under a NestedRadioGroup"); } } }