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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 com.android.camera;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
/**
* A button designed to be used for the on-screen shutter button.
* It's currently an {@code ImageView} that can call a delegate when the
* pressed state changes.
*/
public class ShutterButton extends ImageView {
private class LongClickListener implements View.OnLongClickListener {
public boolean onLongClick(View v) {
if ( null != mListener ) {
mListener.onShutterButtonLongClick();
return true;
}
return false;
}
}
private boolean mTouchEnabled = true;
private LongClickListener mLongClick = new LongClickListener();
/**
* A callback to be invoked when a ShutterButton's pressed state changes.
*/
public interface OnShutterButtonListener {
/**
* Called when a ShutterButton has been pressed.
*
* @param pressed The ShutterButton that was pressed.
*/
void onShutterButtonFocus(boolean pressed);
void onShutterButtonClick();
void onShutterButtonLongClick();
}
private OnShutterButtonListener mListener;
private boolean mOldPressed;
public ShutterButton(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void setOnShutterButtonListener(OnShutterButtonListener listener) {
mListener = listener;
setOnLongClickListener(mLongClick);
}
@Override
public boolean dispatchTouchEvent(MotionEvent m) {
if (mTouchEnabled) {
return super.dispatchTouchEvent(m);
} else {
return false;
}
}
public void enableTouch(boolean enable) {
mTouchEnabled = enable;
setLongClickable(enable);
}
private void callShutterButtonFocus(boolean pressed) {
if (mListener != null) {
mListener.onShutterButtonFocus(pressed);
}
}
@Override
public boolean performClick() {
boolean result = super.performClick();
if (mListener != null && getVisibility() == View.VISIBLE) {
mListener.onShutterButtonClick();
}
return result;
}
}
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