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/*
* 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.camera.ui;
import com.android.camera.R;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
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 {
private static final String TAG = "ZoomControl";
public interface OnZoomChangedListener {
void onZoomValueChanged(int index); // only for immediate zoom
void onZoomStateChanged(int state); // only for smooth zoom
}
private int mZoomMax, mZoomIndex;
private boolean mSmoothZoomSupported;
private OnZoomChangedListener mListener;
private boolean mZoomSupported = true;
// The state of zoom button.
public static final int ZOOM_IN = 0;
public static final int ZOOM_OUT = 1;
public static final int ZOOM_STOP = 2;
protected OnIndicatorEventListener mOnIndicatorEventListener;
public ZoomControl(Context context, AttributeSet attrs) {
super(context, attrs);
}
public abstract void initialize(Context context);
public void setZoomMax(int zoomMax) {
mZoomMax = zoomMax;
}
public void setZoomSupported(boolean supported) {
mZoomSupported = supported;
}
public boolean isZoomSupported() {
return mZoomSupported;
}
public void setOnZoomChangeListener(OnZoomChangedListener listener) {
mListener = listener;
}
public void setOnIndicatorEventListener(OnIndicatorEventListener listener) {
mOnIndicatorEventListener = listener;
}
public void setZoomIndex(int index) {
if (index < 0 || index > mZoomMax) {
throw new IllegalArgumentException("Invalid zoom value:" + index);
}
mZoomIndex = index;
}
public void setSmoothZoomSupported(boolean smoothZoomSupported) {
mSmoothZoomSupported = smoothZoomSupported;
}
public boolean zoomIn() {
return (mZoomIndex == mZoomMax) ? false : changeZoomIndex(mZoomIndex + 1);
}
public boolean zoomOut() {
return (mZoomIndex == 0) ? false : changeZoomIndex(mZoomIndex - 1);
}
public void stopZooming() {
if (mSmoothZoomSupported) {
if (mListener != null) mListener.onZoomStateChanged(ZOOM_STOP);
}
}
private boolean changeZoomIndex(int index) {
int zoomType = (index < mZoomIndex) ? ZOOM_OUT : ZOOM_IN;
if (mListener != null) {
if (mSmoothZoomSupported) {
if (((zoomType == ZOOM_IN) && (mZoomIndex != mZoomMax)) ||
((zoomType == ZOOM_OUT) && (mZoomIndex != 0))) {
mListener.onZoomStateChanged(zoomType);
}
} else {
mListener.onZoomStateChanged(index);
}
mZoomIndex = index;
}
return true;
}
public void setDegree(int degree) {
int count = getChildCount();
for (int i = 0 ; i < count ; ++i) {
View view = getChildAt(i);
if (view instanceof RotateImageView) {
((RotateImageView) view).setDegree(degree);
}
}
}
protected int getZoomIndex() {
return mZoomIndex;
}
}
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