Android Open Source - NerdRoll Screen Conductor

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Back to project page NerdRoll.

License

The source code is released under:

Apache License

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Java Source Code

package com.bignerdranch.android.nerdroll.util;
//from  w  w  w . j a v  a2  s .com
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;

import com.bignerdranch.android.nerdroll.R;

import flow.Flow;
import flow.Layouts;
import mortar.Blueprint;
import mortar.Mortar;
import mortar.MortarScope;

import static android.view.animation.AnimationUtils.loadAnimation;

public class ScreenConductor<S extends Blueprint> implements CanShowScreen<S> {

    private final Context context;
    private final ViewGroup container;

    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) {
            MortarScope oldChildScope = Mortar.getScope(oldChild.getContext());
            if (oldChildScope.getName().equals(screen.getMortarScopeName())) {
                // If it's already showing, short circuit.
                return;
            }

            myScope.destroyChild(oldChildScope);
        }

        // 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, 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;

        oldChild.setAnimation(loadAnimation(context, out));
        newChild.setAnimation(loadAnimation(context, in));
    }

    private View getChildView() {
        return container.getChildAt(0);
    }

}

Java Source Code List