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/*
* Copyright (C) 2015 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.messaging.ui.mediapicker;
import android.content.Context;
import android.content.res.Configuration;
import android.hardware.Camera;
import android.view.View;
import android.view.View.MeasureSpec;
import com.android.messaging.util.Assert;
import java.io.IOException;
/**
* Contains shared code for SoftwareCameraPreview and HardwareCameraPreview, cannot use inheritance
* because those classes must inherit from separate Views, so those classes delegate calls to this
* helper class. Specifics for each implementation are in CameraPreviewHost
*/
public class CameraPreview {
public interface CameraPreviewHost {
View getView();
boolean isValid();
void startPreview(final Camera camera) throws IOException;
void onCameraPermissionGranted();
}
private int mCameraWidth = -1;
private int mCameraHeight = -1;
private final CameraPreviewHost mHost;
public CameraPreview(final CameraPreviewHost host) {
Assert.notNull(host);
Assert.notNull(host.getView());
mHost = host;
}
public void setSize(final Camera.Size size, final int orientation) {
switch (orientation) {
case 0:
case 180:
mCameraWidth = size.width;
mCameraHeight = size.height;
break;
case 90:
case 270:
default:
mCameraWidth = size.height;
mCameraHeight = size.width;
}
mHost.getView().requestLayout();
}
public int getWidthMeasureSpec(final int widthMeasureSpec, final int heightMeasureSpec) {
if (mCameraHeight >= 0) {
final int width = View.MeasureSpec.getSize(widthMeasureSpec);
return MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
} else {
return widthMeasureSpec;
}
}
public int getHeightMeasureSpec(final int widthMeasureSpec, final int heightMeasureSpec) {
if (mCameraHeight >= 0) {
final int orientation = getContext().getResources().getConfiguration().orientation;
final int width = View.MeasureSpec.getSize(widthMeasureSpec);
final float aspectRatio = (float) mCameraWidth / (float) mCameraHeight;
int height;
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
height = (int) (width * aspectRatio);
} else {
height = (int) (width / aspectRatio);
}
return View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);
} else {
return heightMeasureSpec;
}
}
public void onVisibilityChanged(final int visibility) {
if (CameraManager.hasCameraPermission()) {
if (visibility == View.VISIBLE) {
CameraManager.get().openCamera();
} else {
CameraManager.get().closeCamera();
}
}
}
public Context getContext() {
return mHost.getView().getContext();
}
public void setOnTouchListener(final View.OnTouchListener listener) {
mHost.getView().setOnTouchListener(listener);
}
public int getHeight() {
return mHost.getView().getHeight();
}
public void onAttachedToWindow() {
if (CameraManager.hasCameraPermission()) {
CameraManager.get().openCamera();
}
}
public void onDetachedFromWindow() {
CameraManager.get().closeCamera();
}
public void onRestoreInstanceState() {
if (CameraManager.hasCameraPermission()) {
CameraManager.get().openCamera();
}
}
public void onCameraPermissionGranted() {
CameraManager.get().openCamera();
}
/**
* @return True if the view is valid and prepared for the camera to start showing the preview
*/
public boolean isValid() {
return mHost.isValid();
}
/**
* Starts the camera preview on the current surface. Abstracts out the differences in API
* from the CameraManager
* @throws IOException Which is caught by the CameraManager to display an error
*/
public void startPreview(final Camera camera) throws IOException {
mHost.startPreview(camera);
}
}
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