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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.os.Handler;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
/**
* A view that contains camera zoom control and its layout.
*/
public class ZoomControlBar extends ZoomControl {
private static final String TAG = "ZoomControlBar";
private static final int ZOOMING_INTERVAL = 300; // milliseconds
private ImageView mZoomIn;
private ImageView mZoomOut;
private ImageView mZoomSlider;
private View mBar;
private int mSliderPosition = 0;
private Handler mHandler;
private int mDegree;
private final Runnable mRunnable = new Runnable() {
public void run() {
if (mSliderPosition < 0) {
zoomIn();
} else if (mSliderPosition > 0) {
zoomOut();
}
if (mSliderPosition != 0) mHandler.postDelayed(mRunnable, ZOOMING_INTERVAL);
}
};
public ZoomControlBar(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void initialize(Context context) {
mZoomIn = addImageView(context, R.drawable.ic_zoom_in_holo_light);
mBar = new View(context);
mBar.setBackgroundResource(R.drawable.ic_zoom_big);
addView(mBar);
mZoomSlider = addImageView(context, R.drawable.btn_zoom_slider);
mZoomOut = addImageView(context, R.drawable.ic_zoom_out_holo_light);
mHandler = new Handler();
}
ImageView addImageView(Context context, int iconResourceId) {
ImageView image = new RotateImageView(context);
image.setImageResource(iconResourceId);
addView(image);
return image;
}
private void closeControl() {
mHandler.removeCallbacks(mRunnable);
mSliderPosition = 0;
stopZooming();
mOnIndicatorEventListener.onIndicatorEvent(
OnIndicatorEventListener.EVENT_LEAVE_ZOOM_CONTROL_BAR);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
if (!onFilterTouchEventForSecurity(event)) return false;
int action = event.getAction();
if (!isEnabled()) return false;
double y = (double) event.getY();
int offset = getHeight() / 2;
// For left-hand users, as the device is rotated for 180 degree for
// landscape mode, the zoom-in bottom should be on the top, so the
// position should be reversed.
if (mDegree == 180) {
mSliderPosition = offset - (int) y;
} else {
mSliderPosition = (int) y - offset;
}
// TODO: add fast zoom change here
switch (action) {
case MotionEvent.ACTION_DOWN:
mHandler.postDelayed(mRunnable, ZOOMING_INTERVAL);
mZoomSlider.setPressed(true);
break;
case MotionEvent.ACTION_OUTSIDE:
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mZoomSlider.setPressed(false);
closeControl();
break;
default:
requestLayout();
}
return true;
}
@Override
public void setDegree(int degree) {
// layout for the left-hand camera control
if ((degree == 180) || (mDegree == 180)) requestLayout();
mDegree = degree;
super.setDegree(degree);
}
@Override
protected void onLayout(
boolean changed, int left, int top, int right, int bottom) {
int width = right - left;
int height = bottom - top;
int h = height / 2;
int pos;
// For left-hand users, as the device is rotated for 180 degree,
// the zoom-in button should be on the top.
if (mDegree == 180) {
pos = h - mSliderPosition - width / 2;
mZoomOut.layout(0, top, width, top + width);
mZoomIn.layout(0, bottom - width, width, bottom);
} else {
pos = h + mSliderPosition - width / 2;
mZoomIn.layout(0, top, width, top + width);
mZoomOut.layout(0, bottom - width, width, bottom);
}
mBar.layout(0, top + width, width, bottom - width);
if (pos < width) {
pos = width;
} else if (pos > (height - 2 * width)) {
pos = height - 2 * width;
}
mZoomSlider.layout(0, pos, width, pos + width);
}
}
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