com.badlogic.gdx.Game.java Source code

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Here is the source code for com.badlogic.gdx.Game.java

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/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * 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.badlogic.gdx;

/** <p>
 * An {@link ApplicationListener} that delegates to a {@link Screen}. This allows an application to easily have multiple screens.
 * </p>
 * <p>
 * Screens are not disposed automatically. You must handle whether you want to keep screens around or dispose of them when another
 * screen is set.
 * </p> */
public abstract class Game implements ApplicationListener {
    private Screen screen;

    @Override
    public void dispose() {
        if (screen != null)
            screen.hide();
    }

    @Override
    public void pause() {
        if (screen != null)
            screen.pause();
    }

    @Override
    public void resume() {
        if (screen != null)
            screen.resume();
    }

    @Override
    public void render() {
        if (screen != null)
            screen.render(Gdx.graphics.getDeltaTime());
    }

    @Override
    public void resize(int width, int height) {
        if (screen != null)
            screen.resize(width, height);
    }

    /** Sets the current screen. {@link Screen#hide()} is called on any old screen, and {@link Screen#show()} is called on the new
     * screen, if any.
     * @param screen may be {@code null} */
    public void setScreen(Screen screen) {
        if (this.screen != null)
            this.screen.hide();
        this.screen = screen;
        if (this.screen != null) {
            this.screen.show();
            this.screen.resize(Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        }
    }

    /** @return the currently active {@link Screen}. */
    public Screen getScreen() {
        return screen;
    }
}