core/tests/coretests/src/android/view/VisibilityCallback.java

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * 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 android.view;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.TextView;
import com.android.frameworks.coretests.R;

import android.os.Bundle;
import android.widget.Button;
import android.view.View;
import android.app.Activity;

/**
 * Exercise View's ability to change their visibility: GONE, INVISIBLE and
 * VISIBLE. 
 */
public class VisibilityCallback extends Activity {
    private static final boolean DEBUG = false;

    private MonitoredTextView mVictim;
    
    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.visibility_callback);

        // Find the view whose visibility will change
        mVictim = (MonitoredTextView)findViewById(R.id.victim);

        // Find our buttons
        Button visibleButton = findViewById(R.id.vis);
        Button invisibleButton = findViewById(R.id.invis);
        Button goneButton = findViewById(R.id.gone);

        // Wire each button to a click listener
        visibleButton.setOnClickListener(mVisibleListener);
        invisibleButton.setOnClickListener(mInvisibleListener);
        goneButton.setOnClickListener(mGoneListener);
    }


    View.OnClickListener mVisibleListener = new View.OnClickListener() {
        public void onClick(View v) {
            mVictim.setVisibility(View.VISIBLE);
        }
    };

    View.OnClickListener mInvisibleListener = new View.OnClickListener() {
        public void onClick(View v) {
            mVictim.setVisibility(View.INVISIBLE);
        }
    };

    View.OnClickListener mGoneListener = new View.OnClickListener() {
        public void onClick(View v) {
            mVictim.setVisibility(View.GONE);
        }
    };

    public static class MonitoredTextView extends TextView {
        private View mLastVisChangedView;
        private int mLastChangedVisibility;

        public MonitoredTextView(Context context) {
            super(context);
        }

        public MonitoredTextView(Context context, AttributeSet attrs) {
            super(context, attrs);
        }

        public MonitoredTextView(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
        }

        public View getLastVisChangedView() {
            return mLastVisChangedView;
        }

        public int getLastChangedVisibility() {
            return mLastChangedVisibility;
        }

        @Override
        protected void onVisibilityChanged(View changedView, int visibility) {
            mLastVisChangedView = changedView;
            mLastChangedVisibility = visibility;

            if (DEBUG) {
                Log.d("viewVis", "visibility: " + visibility);
            }
        }
    }
}