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/*
* Copyright 2013 Square Inc.
*
* 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.example.mortar.util;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import com.example.mortar.R;
import flow.Flow;
import flow.Layouts;
import mortar.Blueprint;
import mortar.Mortar;
import mortar.MortarScope;
import static android.view.animation.AnimationUtils.loadAnimation;
/**
* A conductor that can swap subviews within a container view.
* <p/>
*
* @param <S> the type of the screens that serve as a {@link Blueprint} for subview. Must
* be annotated with {@link flow.Layout}, suitable for use with {@link flow.Layouts#createView}.
*/
public class ScreenConductor<S extends Blueprint> implements CanShowScreen<S> {
private final Context context;
private final ViewGroup container;
private MortarScope scopeToDestroy;
/**
* @param container the container used to host child views. Typically this is a {@link
* android.widget.FrameLayout} under the action bar.
*/
public ScreenConductor(Context context, ViewGroup container) {
this.context = context;
this.container = container;
}
public void showScreen(S screen, Flow.Direction direction) {
MortarScope myScope = Mortar.getScope(context);
MortarScope newChildScope = myScope.requireChild(screen);
View oldChild = getChildView();
View newChild;
if (oldChild != null) {
//ensure there are no old scopes that need to be destroyed
MortarScope oldScope = Mortar.getScope(oldChild.getContext());
if (oldScope.getName().equals(screen.getMortarScopeName())) {
// If it's already showing, short circuit.
return;
}
// Destroy a pending old scope if it exists, and track this old scope for destruction
destroyOldScope();
scopeToDestroy = oldScope;
}
// Create the new child.
Context childContext = newChildScope.createContext(context);
newChild = Layouts.createView(childContext, screen);
setAnimation(direction, oldChild, newChild);
// Out with the old, in with the new.
if (oldChild != null) {
container.removeView(oldChild);
}
container.addView(newChild);
}
protected void setAnimation(Flow.Direction direction, final View oldChild, View newChild) {
if (oldChild == null) return;
int out = direction == Flow.Direction.FORWARD ? R.anim.slide_out_left : R.anim.slide_out_right;
int in = direction == Flow.Direction.FORWARD ? R.anim.slide_in_right : R.anim.slide_in_left;
Animation oldOutAnimation = loadAnimation(context, out);
oldOutAnimation.setAnimationListener(new Animation.AnimationListener() {
@Override public void onAnimationStart(
Animation animation) {
}
@Override public void onAnimationEnd(Animation animation) {
//Destroy scope when the animation finishes to synchronize with view destruction
destroyOldScope();
}
@Override public void onAnimationRepeat(Animation animation) {
}
});
oldChild.setAnimation(oldOutAnimation);
newChild.setAnimation(loadAnimation(context, in));
}
private View getChildView() {
return container.getChildAt(0);
}
//Called from containers View#onDetachFromWindow()
public void onContainerDetached() {
destroyOldScope();
}
private void destroyOldScope() {
if (scopeToDestroy == null) {
return;
}
//TODO Getting exception here when app is closed and container is detached
// java.lang.IllegalArgumentException: Cannot find scope in com.app.ui.MainActivity. Make sure your Activity overrides getSystemService() to return its scope if isScopeSystemService() is true
MortarScope myScope = Mortar.getScope(context);
myScope.destroyChild(scopeToDestroy);
scopeToDestroy = null;
}
}
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