/*
* Copyright (C) 2011 Patrik �kerfeldt
*
* 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 org.taptwo.android.widget;
import org.taptwo.android.widget.viewflow.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.os.AsyncTask;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.Animation.AnimationListener;
/**
* A FlowIndicator which draws circles (one for each view).
* <br/>
* Availables attributes are:<br/>
* <ul>
* activeColor: Define the color used to draw the active circle (default to white)
* </ul>
* <ul>
* inactiveColor: Define the color used to draw the inactive circles (default to 0x44FFFFFF)
* </ul>
* <ul>
* inactiveType: Define how to draw the inactive circles, either stroke or fill (default to stroke)
* </ul>
* <ul>
* activeType: Define how to draw the active circle, either stroke or fill (default to fill)
* </ul>
* <ul>
* fadeOut: Define the time (in ms) until the indicator will fade out (default to 0 = never fade out)
* </ul>
* <ul>
* radius: Define the circle radius (default to 4.0)
* </ul>
*/
public class CircleFlowIndicator extends View implements FlowIndicator,
AnimationListener {
private static final int STYLE_STROKE = 0;
private static final int STYLE_FILL = 1;
private float radius = 4;
private int fadeOutTime = 0;
private final Paint mPaintInactive = new Paint(Paint.ANTI_ALIAS_FLAG);
private final Paint mPaintActive = new Paint(Paint.ANTI_ALIAS_FLAG);
private ViewFlow viewFlow;
private int currentScroll = 0;
private int flowWidth = 0;
private FadeTimer timer;
public AnimationListener animationListener = this;
private Animation animation;
private boolean mCentered = false;
/**
* Default constructor
*
* @param context
*/
public CircleFlowIndicator(Context context) {
super(context);
initColors(0xFFFFFFFF, 0xFFFFFFFF, STYLE_FILL, STYLE_STROKE);
}
/**
* The contructor used with an inflater
*
* @param context
* @param attrs
*/
public CircleFlowIndicator(Context context, AttributeSet attrs) {
super(context, attrs);
// Retrieve styles attributs
TypedArray a = context.obtainStyledAttributes(attrs,
R.styleable.CircleFlowIndicator);
// Gets the inactive circle type, defaulting to "fill"
int activeType = a.getInt(R.styleable.CircleFlowIndicator_activeType,
STYLE_FILL);
int activeDefaultColor = 0xFFFFFFFF;
// Get a custom inactive color if there is one
int activeColor = a
.getColor(R.styleable.CircleFlowIndicator_activeColor,
activeDefaultColor);
// Gets the inactive circle type, defaulting to "stroke"
int inactiveType = a.getInt(
R.styleable.CircleFlowIndicator_inactiveType, STYLE_STROKE);
int inactiveDefaultColor = 0x44FFFFFF;
// Get a custom inactive color if there is one
int inactiveColor = a.getColor(
R.styleable.CircleFlowIndicator_inactiveColor,
inactiveDefaultColor);
// Retrieve the radius
radius = a.getDimension(R.styleable.CircleFlowIndicator_radius, 4.0f);
// Retrieve the fade out time
fadeOutTime = a.getInt(R.styleable.CircleFlowIndicator_fadeOut, 0);
mCentered = a.getBoolean(R.styleable.CircleFlowIndicator_centered, false);
initColors(activeColor, inactiveColor, activeType, inactiveType);
}
private void initColors(int activeColor, int inactiveColor, int activeType,
int inactiveType) {
// Select the paint type given the type attr
switch (inactiveType) {
case STYLE_FILL:
mPaintInactive.setStyle(Style.FILL);
break;
default:
mPaintInactive.setStyle(Style.STROKE);
}
mPaintInactive.setColor(inactiveColor);
// Select the paint type given the type attr
switch (activeType) {
case STYLE_STROKE:
mPaintActive.setStyle(Style.STROKE);
break;
default:
mPaintActive.setStyle(Style.FILL);
}
mPaintActive.setColor(activeColor);
}
/*
* (non-Javadoc)
*
* @see android.view.View#onDraw(android.graphics.Canvas)
*/
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int count = 3;
if (viewFlow != null) {
count = viewFlow.getViewsCount();
}
float circleSeparation = 2*radius+radius;
//this is the amount the first circle should be offset to make the entire thing centered
float centeringOffset = 0;
int leftPadding = getPaddingLeft();
// Draw stroked circles
for (int iLoop = 0; iLoop < count; iLoop++) {
canvas.drawCircle(leftPadding + radius
+ (iLoop * circleSeparation) + centeringOffset,
getPaddingTop() + radius, radius, mPaintInactive);
}
float cx = 0;
if (flowWidth != 0) {
// Draw the filled circle according to the current scroll
cx = (currentScroll * (2 * radius + radius)) / flowWidth;
}
// The flow width has been upadated yet. Draw the default position
canvas.drawCircle(leftPadding + radius + cx+centeringOffset, getPaddingTop()
+ radius, radius, mPaintActive);
}
/*
* (non-Javadoc)
*
* @see
* org.taptwo.android.widget.ViewFlow.ViewSwitchListener#onSwitched(android
* .view.View, int)
*/
@Override
public void onSwitched(View view, int position) {
}
/*
* (non-Javadoc)
*
* @see
* org.taptwo.android.widget.FlowIndicator#setViewFlow(org.taptwo.android
* .widget.ViewFlow)
*/
@Override
public void setViewFlow(ViewFlow view) {
resetTimer();
viewFlow = view;
flowWidth = viewFlow.getWidth();
invalidate();
}
/*
* (non-Javadoc)
*
* @see org.taptwo.android.widget.FlowIndicator#onScrolled(int, int, int,
* int)
*/
@Override
public void onScrolled(int h, int v, int oldh, int oldv) {
setVisibility(View.VISIBLE);
resetTimer();
currentScroll = h;
flowWidth = viewFlow.getWidth();
invalidate();
}
/*
* (non-Javadoc)
*
* @see android.view.View#onMeasure(int, int)
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(measureWidth(widthMeasureSpec),
measureHeight(heightMeasureSpec));
}
/**
* Determines the width of this view
*
* @param measureSpec
* A measureSpec packed into an int
* @return The width of the view, honoring constraints from measureSpec
*/
private int measureWidth(int measureSpec) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
// We were told how big to be
if (specMode == MeasureSpec.EXACTLY) {
result = specSize;
}
// Calculate the width according the views count
else {
int count = 3;
if (viewFlow != null) {
count = viewFlow.getViewsCount();
}
result = (int) (getPaddingLeft() + getPaddingRight()
+ (count * 2 * radius) + (count - 1) * radius + 1);
// Respect AT_MOST value if that was what is called for by
// measureSpec
if (specMode == MeasureSpec.AT_MOST) {
result = Math.min(result, specSize);
}
}
return result;
}
/**
* Determines the height of this view
*
* @param measureSpec
* A measureSpec packed into an int
* @return The height of the view, honoring constraints from measureSpec
*/
private int measureHeight(int measureSpec) {
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
// We were told how big to be
if (specMode == MeasureSpec.EXACTLY) {
result = specSize;
}
// Measure the height
else {
result = (int) (2 * radius + getPaddingTop() + getPaddingBottom() + 1);
// Respect AT_MOST value if that was what is called for by
// measureSpec
if (specMode == MeasureSpec.AT_MOST) {
result = Math.min(result, specSize);
}
}
return result;
}
/**
* Sets the fill color
*
* @param color
* ARGB value for the text
*/
public void setFillColor(int color) {
mPaintActive.setColor(color);
invalidate();
}
/**
* Sets the stroke color
*
* @param color
* ARGB value for the text
*/
public void setStrokeColor(int color) {
mPaintInactive.setColor(color);
invalidate();
}
/**
* Resets the fade out timer to 0. Creating a new one if needed
*/
private void resetTimer() {
// Only set the timer if we have a timeout of at least 1 millisecond
if (fadeOutTime > 0) {
// Check if we need to create a new timer
if (timer == null || timer._run == false) {
// Create and start a new timer
timer = new FadeTimer();
timer.execute();
} else {
// Reset the current tiemr to 0
timer.resetTimer();
}
}
}
/**
* Counts from 0 to the fade out time and animates the view away when
* reached
*/
private class FadeTimer extends AsyncTask<Void, Void, Void> {
// The current count
private int timer = 0;
// If we are inside the timing loop
private boolean _run = true;
public void resetTimer() {
timer = 0;
}
@Override
protected Void doInBackground(Void... arg0) {
while (_run) {
try {
// Wait for a millisecond
Thread.sleep(1);
// Increment the timer
timer++;
// Check if we've reached the fade out time
if (timer == fadeOutTime) {
// Stop running
_run = false;
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPostExecute(Void result) {
animation = AnimationUtils.loadAnimation(getContext(),
android.R.anim.fade_out);
animation.setAnimationListener(animationListener);
startAnimation(animation);
}
}
@Override
public void onAnimationEnd(Animation animation) {
setVisibility(View.GONE);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationStart(Animation animation) {
}
}