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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 com.android.camera.Util;
import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
/**
* A view that contains camera zoom control and its layout.
*/
public class ZoomControlBar extends ZoomControl {
private static final String TAG = "ZoomControlBar";
private static int THRESHOLD_FIRST_MOVE = Util.dpToPixel(10); // pixels
private View mBar;
private boolean mStartChanging;
public ZoomControlBar(Context context, AttributeSet attrs) {
super(context, attrs);
mBar = new View(context);
mBar.setBackgroundResource(R.drawable.ic_zoom_big);
addView(mBar);
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
if (!onFilterTouchEventForSecurity(event)) return false;
int action = event.getAction();
if (!isEnabled()) return false;
double y = (double) event.getY();
// Calculate the absolute offset of the slider in the zoom control bar.
// 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.
int offset = 5 * getWidth() / 4; // the padding and the icon height
int height = getHeight();
int range = height - 2 * offset; // the range of the zoom slider
int pos; // the relative position in the zoom slider bar
if (mDegree == 180) {
pos = (int) y - offset;
} else {
pos = height - (int) y - offset;
}
if (pos < 0) pos = 0;
if (pos > range) pos = range;
switch (action) {
case MotionEvent.ACTION_OUTSIDE:
case MotionEvent.ACTION_CANCEL:
closeZoomControl();
break;
case MotionEvent.ACTION_DOWN:
mStartChanging = false;
case MotionEvent.ACTION_MOVE:
// Make sure the movement is large enough before we start
// changing the zoom.
if (!mStartChanging && (Math.abs(mSliderPosition - pos)
> THRESHOLD_FIRST_MOVE)) {
mStartChanging = true;
}
if (mStartChanging) {
performZoom(1.0d * pos / range);
mSliderPosition = pos;
}
requestLayout();
}
return true;
}
@Override
public void setDegree(int degree) {
// layout for the left-hand camera control
if ((degree == 180) || (mDegree == 180)) requestLayout();
super.setDegree(degree);
}
@Override
protected void onLayout(
boolean changed, int left, int top, int right, int bottom) {
if (mZoomMax == 0) return;
int width = right - left;
int height = bottom - top;
int range = height - 10 * width / 4;
int pos;
// TODO: remove offset once we have correct ic_zoom_big.9.png.
int offset = 3 * width / 4;
// For left-hand users, as the device is rotated for 180 degree,
// the zoom-in button should be on the top.
if (mDegree == 180) {
mZoomOut.layout(0, 0, width, width);
mZoomIn.layout(0, height - width, width, height);
pos = offset + mZoomIndex * range / mZoomMax;
mZoomSlider.layout(0, pos, width, pos + width);
} else {
mZoomIn.layout(0, 0, width, width);
mZoomOut.layout(0, height - width, width, height);
pos = offset + (mZoomMax - mZoomIndex) * range / mZoomMax;
mZoomSlider.layout(0, pos, width, pos + width);
}
mBar.layout(0, width, width, bottom - top - width);
}
}
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