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/*
* Copyright (C) 2008 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.widget;
import android.annotation.Widget;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.AlphaAnimation;
import com.android.internal.R;
/**
* The {@code ZoomControls} class displays a simple set of controls used for zooming and
* provides callbacks to register for events. */
@Widget
public class ZoomControls extends LinearLayout {
private final ZoomButton mZoomIn;
private final ZoomButton mZoomOut;
public ZoomControls(Context context) {
this(context, null);
}
public ZoomControls(Context context, AttributeSet attrs) {
super(context, attrs);
setFocusable(false);
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.zoom_controls, this, // we are the parent
true);
mZoomIn = (ZoomButton) findViewById(R.id.zoomIn);
mZoomOut = (ZoomButton) findViewById(R.id.zoomOut);
}
public void setOnZoomInClickListener(OnClickListener listener) {
mZoomIn.setOnClickListener(listener);
}
public void setOnZoomOutClickListener(OnClickListener listener) {
mZoomOut.setOnClickListener(listener);
}
/*
* Sets how fast you get zoom events when the user holds down the
* zoom in/out buttons.
*/
public void setZoomSpeed(long speed) {
mZoomIn.setZoomSpeed(speed);
mZoomOut.setZoomSpeed(speed);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
/* Consume all touch events so they don't get dispatched to the view
* beneath this view.
*/
return true;
}
public void show() {
fade(View.VISIBLE, 0.0f, 1.0f);
}
public void hide() {
fade(View.GONE, 1.0f, 0.0f);
}
private void fade(int visibility, float startAlpha, float endAlpha) {
AlphaAnimation anim = new AlphaAnimation(startAlpha, endAlpha);
anim.setDuration(500);
startAnimation(anim);
setVisibility(visibility);
}
public void setIsZoomInEnabled(boolean isEnabled) {
mZoomIn.setEnabled(isEnabled);
}
public void setIsZoomOutEnabled(boolean isEnabled) {
mZoomOut.setEnabled(isEnabled);
}
@Override
public boolean hasFocus() {
return mZoomIn.hasFocus() || mZoomOut.hasFocus();
}
}
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