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/*
* Copyright (C) 2010 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.ComboPreferences;
import com.android.camera.PreferenceGroup;
import com.android.camera.R;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.Button;
import android.view.MotionEvent;
import android.view.ViewGroup;
import android.view.View;
import java.lang.Math;
/**
* A view that contains camera settings and shutter buttons. The settings are
* spreaded around the shutter button.
*/
public class IndicatorWheel extends ViewGroup {
private static final String TAG = "IndicatorWheel";
private Listener mListener;
private int mCenterX, mCenterY;
private double mShutterButtonRadius;
private double mSectorInitialRadians[];
static public interface Listener {
public void onIndicatorClicked(int index);
}
public void setListener(Listener listener) {
mListener = listener;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int count = getChildCount();
if (mListener == null || count <= 1) return false;
// Check if any setting is pressed.
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN
|| action == MotionEvent.ACTION_MOVE) {
double dx = event.getX() - mCenterX;
double dy = mCenterY - event.getY();
double radius = Math.sqrt(dx * dx + dy * dy);
// Ignore the event if it's too near to the shutter button.
if (radius < mShutterButtonRadius) return false;
double intervalDegrees = 180.0 / (count - 2);
double delta = Math.atan2(dy, dx);
if (delta < 0) delta += Math.PI * 2;
// Check which sector is pressed.
if (delta > mSectorInitialRadians[0]) {
for (int i = 1; i < count; i++) {
if (delta < mSectorInitialRadians[i]) {
mListener.onIndicatorClicked(i - 1);
return true;
}
}
}
}
return false;
}
public IndicatorWheel(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void removeIndicators() {
// Remove everything but the shutter button.
int count = getChildCount();
if (count > 1) {
removeViews(1, count - 1);
}
}
@Override
protected void onMeasure(int widthSpec, int heightSpec) {
// Measure all children.
int freeSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
for (int i = 0; i < getChildCount(); i++) {
getChildAt(i).measure(freeSpec, freeSpec);
}
// Measure myself.
View shutterButton = getChildAt(0);
int desiredWidth = (int)(shutterButton.getMeasuredWidth() * 2.5);
int desiredHeight = (int)(shutterButton.getMeasuredHeight() * 2.5);
int widthMode = MeasureSpec.getMode(widthSpec);
int heightMode = MeasureSpec.getMode(heightSpec);
int measuredWidth, measuredHeight;
if (widthMode == MeasureSpec.UNSPECIFIED) {
measuredWidth = desiredWidth;
} else if (widthMode == MeasureSpec.AT_MOST) {
measuredWidth = Math.min(desiredWidth, MeasureSpec.getSize(widthSpec));
} else { // MeasureSpec.EXACTLY
measuredWidth = MeasureSpec.getSize(widthSpec);
}
if (heightMode == MeasureSpec.UNSPECIFIED) {
measuredHeight = desiredHeight;
} else if (heightMode == MeasureSpec.AT_MOST) {
measuredHeight = Math.min(desiredHeight, MeasureSpec.getSize(heightSpec));
} else { // MeasureSpec.EXACTLY
measuredHeight = MeasureSpec.getSize(heightSpec);
}
setMeasuredDimension(measuredWidth, measuredHeight);
}
@Override
protected void onLayout(
boolean changed, int left, int top, int right, int bottom) {
int count = getChildCount();
if (count == 0) return;
// Layout the shutter button.
View shutterButton = findViewById(R.id.shutter_button);
int width = shutterButton.getMeasuredWidth();
mShutterButtonRadius = width / 2.0 + 10;
int height = shutterButton.getMeasuredHeight();
mCenterX = (right - left) - width / 2;
mCenterY = (bottom - top) / 2;
shutterButton.layout(mCenterX - width / 2, mCenterY - height / 2,
mCenterX + width / 2, mCenterY + height / 2);
// Layout the settings. The icons are spreaded on the left side of the
// shutter button. So the angle starts from 90 to 270 degrees.
if (count == 1) return;
double radius = shutterButton.getMeasuredWidth();
double intervalDegrees = 180.0 / (count - 2);
double initialDegrees = 90.0;
int index = 0;
for (int i = 0; i < count; i++) {
View view = getChildAt(i);
if (view == shutterButton) continue;
double degree = initialDegrees + intervalDegrees * index;
double radian = Math.toRadians(degree);
int x = mCenterX + (int)(radius * Math.cos(radian));
int y = mCenterY - (int)(radius * Math.sin(radian));
width = view.getMeasuredWidth();
height = view.getMeasuredHeight();
view.layout(x - width / 2, y - height / 2, x + width / 2,
y + height / 2);
index++;
}
// Store the radian intervals for each icon.
mSectorInitialRadians = new double[count];
mSectorInitialRadians[0] = Math.toRadians(
initialDegrees - intervalDegrees / 2.0);
for (int i = 1; i < count; i++) {
mSectorInitialRadians[i] = mSectorInitialRadians[i - 1]
+ Math.toRadians(intervalDegrees);
}
}
public void updateIndicator(int index) {
IndicatorButton indicator = (IndicatorButton) getChildAt(index + 1);
indicator.reloadPreference();
}
}
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