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Project RoboMVVM(https://github.com/debdattabasu/RoboMVVM) Copyright (c) 2014, Debdatta Basu All rights reserved. Redistribution and use in source and binary forms, with or without modification, are ...
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/** * @project RoboMVVM//w w w .ja va2 s . c o m * @project RoboMVVM(https://github.com/debdattabasu/RoboMVVM) * @author Debdatta Basu * * @license 3-clause BSD license(http://opensource.org/licenses/BSD-3-Clause). * Copyright (c) 2014, Debdatta Basu. All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, are permitted provided that * the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this list of * conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, this list of * conditions and the following disclaimer in the documentation and/or other materials * provided with the distribution. * * 3. Neither the name of the copyright holder nor the names of its contributors may be used * to endorse or promote products derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ package org.dbasu.robomvvm.viewmodel; import android.content.Context; import com.google.common.base.Preconditions; import org.dbasu.robomvvm.annotation.SetLayout; import org.dbasu.robomvvm.binding.BindMode; import org.dbasu.robomvvm.binding.Binding; import org.dbasu.robomvvm.binding.DefaultValueConverter; import org.dbasu.robomvvm.binding.ValueConverter; import org.dbasu.robomvvm.componentmodel.Component; import org.dbasu.robomvvm.componentmodel.EventArg; /** * Abstract base class for view models. All view models are associated with a context * and must contain a {@link org.dbasu.robomvvm.annotation.SetLayout} annotation specifying the resource id to use * for its layout. */ public abstract class BaseViewModel extends Component { protected final Context context; /** * Construct a BaseViewModel from a context. * @param context * The supplied context. */ public BaseViewModel(Context context) { this.context = Preconditions.checkNotNull(context); } /** * Get the associated context. * @return * The associated context. */ public Context getContext() { return context; } /** * Get the layout resource id associated with this view model. The id is * set using the {@link org.dbasu.robomvvm.annotation.SetLayout} annotation. * @return * The associated resource Id. */ public int getLayoutId() { Class thisClass = this.getClass(); if(!thisClass.isAnnotationPresent(SetLayout.class)) { throw new RuntimeException("Missing InjectLayout annotation in " + thisClass.getName()); } return ((SetLayout) thisClass.getAnnotation(SetLayout.class)).value(); } /** * Override this in subclasses to set up the bindings between the view model and its layout. */ protected void bind() { } /** * Bind a property of this view model to a property of an element in its layout. * @param property * The property of the view model * @param elementId * The id of the target element. * @param elementProperty * The property of the target element. * @param valueConverter * The value converter to use for conversion. * @param bindMode * The bind mode to use. * @return * The created binding. */ protected abstract Binding bindProperty(String property, int elementId, String elementProperty, ValueConverter valueConverter, BindMode bindMode); /** * Binds an event of this view model to an action of an element in its layout. * @param elementId * The id of the target element. * @param eventType * The event arg class to bind. * @param action * The action of the target element. * @return * The created binding. */ protected abstract Binding bindAction(int elementId, Class<? extends EventArg> eventType, String action); /** * Bind a property of this view model to a property of an element in its layout. Performs no conversion. * Uses {@link org.dbasu.robomvvm.binding.BindMode#SOURCE_TO_TARGET} which results in one-way * binding from this view model to the target element. * * @param property * The property of the view model * @param elementId * The id of the target element. * @param elementProperty * The property of the target element. * @return * The created binding. */ protected final Binding bindProperty(String property, int elementId, String elementProperty) { return bindProperty(property, elementId, elementProperty, new DefaultValueConverter(), BindMode.SOURCE_TO_TARGET); } /** * Bind a property of this view model to a property of an element in its layout. Performs no conversion. * @param property * The property of the view model * @param elementId * The id of the target element. * @param elementProperty * The property of the target element. * @param bindMode * The bind mode to use. * @return * The created binding. */ protected final Binding bindProperty(String property, int elementId, String elementProperty, BindMode bindMode) { return bindProperty(property, elementId, elementProperty, new DefaultValueConverter(), bindMode); } }