| /* |
| * Copyright (C) 2015 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 android.databinding; |
| |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Target; |
| |
| /** |
| * InverseBindingMethod is used to identify how to listen for changes to a View property and which |
| * getter method to call. InverseBindingMethod should be associated with any class as part of |
| * {@link InverseBindingMethods}. |
| * <p> |
| * <pre> |
| * @InverseBindingMethods({@InverseBindingMethod( |
| * type = android.widget.TextView.class, |
| * attribute = "android:text", |
| * event = "android:textAttrChanged", |
| * method = "getText")}) |
| * public class MyTextViewBindingAdapters { ... } |
| * </pre> |
| * <p> |
| * <code>method</code> is optional. If it isn't provided, the attribute name is used to |
| * find the method name, either prefixing with "is" or "get". For the attribute |
| * <code>android:text</code>, data binding will search for a |
| * <code>public CharSequence getText()</code> method on {@link android.widget.TextView}. |
| * <p> |
| * <code>event</code> is optional. If it isn't provided, the event name is assigned the |
| * attribute name suffixed with <code>AttrChanged</code>. For the <code>android:text</code> |
| * attribute, the default event name would be <code>android:textAttrChanged</code>. The event |
| * should be set using a {@link BindingAdapter}. For example: |
| * <pre> |
| * @BindingAdapter(value = {"android:beforeTextChanged", "android:onTextChanged", |
| * "android:afterTextChanged", "android:textAttrChanged"}, |
| * requireAll = false) |
| * public static void setTextWatcher(TextView view, final BeforeTextChanged before, |
| * final OnTextChanged on, final AfterTextChanged after, |
| * final InverseBindingListener textAttrChanged) { |
| * TextWatcher newValue = new TextWatcher() { |
| * ... |
| * @Override |
| * public void onTextChanged(CharSequence s, int start, int before, int count) { |
| * if (on != null) { |
| * on.onTextChanged(s, start, before, count); |
| * } |
| * if (textAttrChanged != null) { |
| * textAttrChanged.onChange(); |
| * } |
| * } |
| * } |
| * TextWatcher oldValue = ListenerUtil.trackListener(view, newValue, R.id.textWatcher); |
| * if (oldValue != null) { |
| * view.removeTextChangedListener(oldValue); |
| * } |
| * view.addTextChangedListener(newValue); |
| * } |
| * </pre> |
| * |
| * @see InverseBindingAdapter |
| * @see InverseBindingListener |
| */ |
| @Target(ElementType.ANNOTATION_TYPE) |
| public @interface InverseBindingMethod { |
| |
| /** |
| * The View type that is associated with the attribute. |
| */ |
| Class type(); |
| |
| /** |
| * The attribute that supports two-way binding. |
| */ |
| String attribute(); |
| |
| /** |
| * The event used to notify the data binding system that the attribute value has changed. |
| * Defaults to attribute() + "AttrChanged" |
| */ |
| String event() default ""; |
| |
| /** |
| * The getter method to retrieve the attribute value from the View. The default is |
| * the bean method name based on the attribute name. |
| */ |
| String method() default ""; |
| } |