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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 .j a v a 2 s . c om*/ * @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 android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.google.common.base.Preconditions; import org.dbasu.robomvvm.binding.BindMode; import org.dbasu.robomvvm.binding.Binding; import org.dbasu.robomvvm.binding.ValueConverter; import org.dbasu.robomvvm.componentmodel.ComponentAdapter; import org.dbasu.robomvvm.componentmodel.EventArg; import org.dbasu.robomvvm.util.ObjectTagger; import org.dbasu.robomvvm.util.ThreadUtil; import java.util.ArrayList; import java.util.List; /** * View model used for creating and binding views. */ public class ViewModel extends BaseViewModel { private static final String VIEW_MODEL = "robomvvm_view_model"; private static final String VIEW_BINDINGS = "robomvvm_view_bindings"; private View view = null; private final List<Binding> bindings = new ArrayList<Binding>(); /** * Construct a ViewModel with a supplied context. * @param context * The supplied context. */ public ViewModel(Context context) { super(context); } /** * Attempt to unbind a pre-existing view from its view model and bind it to this * view model. * @param viewToConvert * The view to convert. * @return * Null if viewToConvert is null. Null if viewToConvert corresponds to a different view model class. * The bound view otherwise. */ public View convertView(View viewToConvert) { Preconditions.checkArgument(ThreadUtil.isUiThread(), "ViewModel.convertView can only be called from the UI thread"); if(viewToConvert == null) return null; ViewModel otherViewModel = (ViewModel) ObjectTagger.getTag(viewToConvert, VIEW_MODEL); if(otherViewModel == null || !otherViewModel.getClass().equals(this.getClass())) return null; List<Binding> otherViewBindings = (List<Binding>) ObjectTagger.getTag(viewToConvert, VIEW_BINDINGS); if(otherViewBindings != null) { for (Binding binding : otherViewBindings) { binding.unbind(); } } this.view = viewToConvert; bind(); ObjectTagger.setTag(viewToConvert, VIEW_MODEL, this); ObjectTagger.setTag(viewToConvert, VIEW_BINDINGS, new ArrayList<Binding>(bindings)); this.view = null; bindings.clear(); return viewToConvert; } /** * Create a view corresponding to this view model. Created with a null parent. The View Model is stored as a tag on the root View using * {@link org.dbasu.robomvvm.util.ObjectTagger}. This makes sure that the View Model is kept alive as long as the View is alive. * @return * The created view. */ public View createView() { return createView(null); } /** * Create a view corresponding to this view model. The View Model is stored as a tag on the root View using * {@link org.dbasu.robomvvm.util.ObjectTagger}. This makes sure that the View Model is kept alive as long as the View is alive. * @param parent * Parent to attach the created view to. * @return * The created view. */ public View createView(ViewGroup parent) { Preconditions.checkArgument(ThreadUtil.isUiThread(), "ViewModel.createView can only be called from the UI thread"); int layoutId = getLayoutId(); LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View viewToConvert = inflater.inflate(layoutId, parent, false); ObjectTagger.setTag(viewToConvert, VIEW_MODEL, this); return convertView(viewToConvert); } /** * Bind a property of this view model to a property of a view in its layout. * @param property * The property of the view model * @param viewId * The id of the target view. * @param viewProperty * The property of the target view. * @param valueConverter * The value converter to use for conversion. * @param bindMode * The bind mode to use. * @return * The created binding. */ @Override protected final Binding bindProperty(String property, int viewId, String viewProperty, ValueConverter valueConverter, BindMode bindMode) { Preconditions.checkArgument(ThreadUtil.isUiThread(), "ViewModel.bindProperty can only be called from the UI thread"); Preconditions.checkNotNull(property); Preconditions.checkNotNull(viewProperty); Preconditions.checkNotNull(valueConverter); Preconditions.checkNotNull(bindMode); View targetView = view.findViewById(viewId); ComponentAdapter adapter = ComponentAdapter.get(targetView); Binding binding = Binding.bindProperty(this, property, adapter, viewProperty, valueConverter, bindMode); bindings.add(binding); return binding; } /** * Binds an event of this view model to an action of a view in its layout. * @param viewId * The id of the target view. * @param eventType * The event arg class to bind. * @param action * The action of the target view. * @return * The created binding. */ @Override protected Binding bindAction(int viewId, Class<? extends EventArg> eventType, String action) { Preconditions.checkArgument(ThreadUtil.isUiThread(), "ViewModel.bindAction can only be called from the UI thread"); Preconditions.checkNotNull(eventType); Preconditions.checkNotNull(action); View targetView = view.findViewById(viewId); ComponentAdapter adapter = ComponentAdapter.get(targetView); Binding binding = Binding.bindAction(adapter, this, eventType, action); bindings.add(binding); return binding; } }