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| /*
* Copyright (C) 2006 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.
*/
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.text.format.Time;
import android.util.AttributeSet;
import android.view.View;
/**
* This widget display an analogic clock with two hands for hours and
* minutes.
*/
public class AnalogClock extends View
{
private Time mCalendar;
private Drawable mHourHand;
private Drawable mMinuteHand;
private Drawable mDial;
private int mDialWidth, mDialHeight;
private int mWidth, mHeight;
private boolean mAttached;
private final Handler mHandler = new Handler();
private float mMinutes;
private float mHour;
private boolean mChanged;
public AnalogClock(Context context)
{
this(context, null);
}
public AnalogClock(Context context, AttributeSet attrs)
{
this(context, attrs, 0);
}
public AnalogClock(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
Resources r = context.getResources();
mDial = r.getDrawable(R.drawable.clock_dial);
mHourHand = r.getDrawable(R.drawable.clock_hour);
mMinuteHand = r.getDrawable(R.drawable.clock_minute);
mCalendar = new Time();
mDialWidth = mDial.getIntrinsicWidth();
mDialHeight = mDial.getIntrinsicHeight();
mWidth = getWidth();
mHeight = getHeight();
}
public void setCalendar(Time calendar)
{
mCalendar = calendar;
onTimeChanged();
invalidate();
}
protected void onAttachedToWindow()
{
super.onAttachedToWindow();
if (!mAttached)
{
mAttached = true;
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_TIME_TICK);
filter.addAction(Intent.ACTION_TIME_CHANGED);
filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
getContext().registerReceiver(mIntentReceiver, filter, null, mHandler);
}
onTimeChanged();
}
protected void onDetachedFromWindow()
{
super.onDetachedFromWindow();
if (mAttached)
{
getContext().unregisterReceiver(mIntentReceiver);
mAttached = false;
}
}
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
float hScale = 1.0f;
float vScale = 1.0f;
if (widthMode != MeasureSpec.UNSPECIFIED && widthSize < mDialWidth)
hScale = (float) widthSize / (float) mDialWidth;
if (heightMode != MeasureSpec.UNSPECIFIED && heightSize < mDialHeight)
vScale = (float) heightSize / (float) mDialHeight;
float scale = Math.min(hScale, vScale);
setMeasuredDimension(resolveSize((int) (mDialWidth * scale), widthMeasureSpec), resolveSize((int) (mDialHeight * scale), heightMeasureSpec));
}
protected void onSizeChanged(int w, int h, int oldw, int oldh)
{
super.onSizeChanged(w, h, oldw, oldh);
mChanged = true;
}
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
boolean changed = mChanged;
if (changed)
mChanged = false;
int availableWidth = getRight() - getLeft();
int availableHeight = getBottom() - getTop();
int x = availableWidth / 2;
int y = availableHeight / 2;
final Drawable dial = mDial;
int w = dial.getIntrinsicWidth();
int h = dial.getIntrinsicHeight();
boolean scaled = false;
if (availableWidth < w || availableHeight < h)
{
scaled = true;
float scale = Math.min((float) availableWidth / (float) w,
(float) availableHeight / (float) h);
canvas.save();
canvas.scale(scale, scale, x, y);
}
if (changed)
dial.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
dial.draw(canvas);
canvas.save();
canvas.rotate(mHour / 12.0f * 360.0f, x, y);
final Drawable hourHand = mHourHand;
if (changed)
{
w = hourHand.getIntrinsicWidth();
h = hourHand.getIntrinsicHeight();
hourHand.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
}
hourHand.draw(canvas);
canvas.restore();
canvas.save();
canvas.rotate(mMinutes / 60.0f * 360.0f, x, y);
final Drawable minuteHand = mMinuteHand;
if (changed)
{
w = minuteHand.getIntrinsicWidth();
h = minuteHand.getIntrinsicHeight();
minuteHand.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
}
minuteHand.draw(canvas);
canvas.restore();
if (scaled)
canvas.restore();
}
private void onTimeChanged()
{
mCalendar.setToNow();
int hour = mCalendar.hour;
int minute = mCalendar.minute;
int second = mCalendar.second;
mMinutes = minute + second / 60.0f;
mHour = hour + mMinutes / 60.0f;
mChanged = true;
}
private final BroadcastReceiver mIntentReceiver = new BroadcastReceiver()
{
public void onReceive(Context context, Intent intent)
{
// if (intent.getAction().equals(Intent.ACTION_TIMEZONE_CHANGED))
// {
// String tz = intent.getStringExtra("time-zone");
// mCalendar = new Time(TimeZone.getTimeZone(tz).getID());
// }
onTimeChanged();
invalidate();
}
};
} |
