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/* Copyright (c) 2012 - 2015, The Linux Foundation. All rights reserved.
* Not a Contribution, Apache license notifications and license are retained
* for attribution purposes only.
*
* Copyright (C) 2011 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 com.android.incallui;
import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.widget.ImageView;
import android.widget.RelativeLayout;
/**
* A view that contains camera zoom control which could adjust the zoom in/out
* if the camera supports zooming.
*/
public abstract class ZoomControl extends RelativeLayout{
protected ImageView mZoomIn;
protected ImageView mZoomOut;
protected ImageView mZoomSlider;
protected int mOrientation;
public interface OnZoomChangedListener {
void onZoomValueChanged(int index); // only for immediate zoom
}
// The interface OnZoomIndexChangedListener is used to inform the
// ZoomIndexBar about the zoom index change. The index position is between
// 0 (the index is zero) and 1.0 (the index is mZoomMax).
public interface OnZoomIndexChangedListener {
void onZoomIndexChanged(double indexPosition);
}
protected int mZoomMax, mZoomIndex;
private OnZoomChangedListener mListener;
private int mStep;
public ZoomControl(Context context, AttributeSet attrs) {
super(context, attrs);
mZoomIn = addImageView(context, R.drawable.ic_zoom_in);
mZoomSlider = addImageView(context, R.drawable.ic_zoom_slider);
mZoomOut = addImageView(context, R.drawable.ic_zoom_out);
}
public void startZoomControl() {
mZoomSlider.setPressed(true);
setZoomIndex(mZoomIndex); // Update the zoom index bar.
}
protected ImageView addImageView(Context context, int iconResourceId) {
ImageView image = new ImageView(context);
image.setImageResource(iconResourceId);
addView(image);
return image;
}
public void closeZoomControl() {
mZoomSlider.setPressed(false);
}
public void setZoomMax(int zoomMax) {
mZoomMax = zoomMax;
// Layout should be requested as the maximum zoom level is the key to
// show the correct zoom slider position.
requestLayout();
}
public int getZoomMax() {
return mZoomMax;
}
public void setOnZoomChangeListener(OnZoomChangedListener listener) {
mListener = listener;
}
public void setZoomIndex(int index) {
if (index < 0 || index > mZoomMax) {
throw new IllegalArgumentException("Invalid zoom value:" + index);
}
mZoomIndex = index;
invalidate();
}
public int getZoomIndex() {
return mZoomIndex;
}
protected void setZoomStep(int step) {
mStep = step;
}
// Called from ZoomControlBar to change the zoom level.
protected void performZoom(double zoomPercentage) {
int index = (int) (mZoomMax * zoomPercentage);
if (mZoomIndex == index) return;
changeZoomIndex(index);
}
private boolean changeZoomIndex(int index) {
if (mListener != null) {
if (index > mZoomMax) index = mZoomMax;
if (index < 0) index = 0;
mListener.onZoomValueChanged(index);
mZoomIndex = index;
}
return true;
}
@Override
public void setActivated(boolean activated) {
super.setActivated(activated);
mZoomIn.setActivated(activated);
mZoomOut.setActivated(activated);
}
}
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