package com.roboo.like.google.views;
import static android.graphics.Paint.ANTI_ALIAS_FLAG;
import static android.widget.LinearLayout.HORIZONTAL;
import static android.widget.LinearLayout.VERTICAL;
import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.drawable.Drawable;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewConfigurationCompat;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import com.roboo.like.google.R;
import com.roboo.like.google.adapters.ImageFragmentAdapter;
import com.roboo.like.google.infinite.InfinitePagerAdapter;
import com.roboo.like.google.infinite.ViewPagerEx;
/**
* Draws circles (one for each view). The current view position is filled and
* others are only stroked.
*/
public class CirclePageIndicator extends View
{
private static final int INVALID_POINTER = -1;
/** 圆圈的半径 */
private float mRadius;
/** 圆的默认填充颜色 */
private final Paint mPaintPageFill = new Paint(ANTI_ALIAS_FLAG);
/** 圆边框填充颜色 */
private final Paint mPaintStroke = new Paint(ANTI_ALIAS_FLAG);
/** 圆的填充颜色 */
private final Paint mPaintFill = new Paint(ANTI_ALIAS_FLAG);
/** 与之关联的 ViewPager */
private ViewPagerEx mViewPager;
private ViewPagerEx.OnPageChangeListener mListener;
private int mCurrentPage;
private int mSnapPage;
private float mPageOffset;
private int mScrollState;
private int mOrientation;
private boolean mCentered;
private boolean mSnap;
private int mTouchSlop;
private float mLastMotionX = -1;
private int mActivePointerId = INVALID_POINTER;
private boolean mIsDragging;
public CirclePageIndicator(Context context)
{
this(context, null);
}
public CirclePageIndicator(Context context, AttributeSet attrs)
{
this(context, attrs, R.attr.vpiCirclePageIndicatorStyle);
}
public CirclePageIndicator(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
if (isInEditMode())
return;
final Resources res = getResources();
final int defaultPageColor = 0x00000000;
final int defaultOrientation = 0;
final int defaultFillColor = 0xFFFFFFFF;
final int defaultStrokeColor = 0xFFDDDDDD;
final float defaultStrokeWidth = res.getDisplayMetrics().density;
final float defaultRadius = res.getDisplayMetrics().density * 3;
final boolean defaultCentered = true;
final boolean defaultSnap = false;
// Retrieve styles attributes
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CirclePageIndicator, defStyle, 0);
try
{
mCentered = a.getBoolean(R.styleable.CirclePageIndicator_centered, defaultCentered);
mOrientation = a.getInt(R.styleable.CirclePageIndicator_android_orientation, defaultOrientation);
mPaintPageFill.setStyle(Style.FILL);
mPaintPageFill.setColor(a.getColor(R.styleable.CirclePageIndicator_pageColor, defaultPageColor));
mPaintStroke.setStyle(Style.STROKE);
mPaintStroke.setColor(a.getColor(R.styleable.CirclePageIndicator_strokeColor, defaultStrokeColor));
mPaintStroke.setStrokeWidth(a.getDimension(R.styleable.CirclePageIndicator_strokeWidth, defaultStrokeWidth));
mPaintFill.setStyle(Style.FILL);
mPaintFill.setColor(a.getColor(R.styleable.CirclePageIndicator_fillColor, defaultFillColor));
mRadius = a.getDimension(R.styleable.CirclePageIndicator_radius, defaultRadius);
mSnap = a.getBoolean(R.styleable.CirclePageIndicator_snap, defaultSnap);
Drawable background = a.getDrawable(R.styleable.CirclePageIndicator_android_background);
if (background != null)
{
setBackgroundDrawable(background);
}
}
finally
{
a.recycle();
}
final ViewConfiguration configuration = ViewConfiguration.get(context);
mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
}
public void setCentered(boolean centered)
{
mCentered = centered;
invalidate();
}
public boolean isCentered()
{
return mCentered;
}
public void setPageColor(int pageColor)
{
mPaintPageFill.setColor(pageColor);
invalidate();
}
public int getPageColor()
{
return mPaintPageFill.getColor();
}
public void setFillColor(int fillColor)
{
mPaintFill.setColor(fillColor);
invalidate();
}
public int getFillColor()
{
return mPaintFill.getColor();
}
public void setOrientation(int orientation)
{
switch (orientation)
{
case HORIZONTAL:
case VERTICAL:
mOrientation = orientation;
requestLayout();
break;
default:
throw new IllegalArgumentException("Orientation must be either HORIZONTAL or VERTICAL.");
}
}
public int getOrientation()
{
return mOrientation;
}
public void setStrokeColor(int strokeColor)
{
mPaintStroke.setColor(strokeColor);
invalidate();
}
public int getStrokeColor()
{
return mPaintStroke.getColor();
}
public void setStrokeWidth(float strokeWidth)
{
mPaintStroke.setStrokeWidth(strokeWidth);
invalidate();
}
public float getStrokeWidth()
{
return mPaintStroke.getStrokeWidth();
}
public void setRadius(float radius)
{
mRadius = radius;
invalidate();
}
public float getRadius()
{
return mRadius;
}
public void setSnap(boolean snap)
{
mSnap = snap;
invalidate();
}
public boolean isSnap()
{
return mSnap;
}
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
if (mViewPager == null)
{
return;
}
int count = mViewPager.getAdapter().getCount();
// ==================================================================
// ==================================================================
// 对无限循环 ViewPager 适配器的处理
// ==================================================================
// ==================================================================
if (mViewPager.getAdapter() instanceof ImageFragmentAdapter)
{
ImageFragmentAdapter adapter = (ImageFragmentAdapter) mViewPager.getAdapter();
count = adapter.getReadlCount();
}
if(mViewPager.getAdapter() instanceof InfinitePagerAdapter)
{
InfinitePagerAdapter infinitePagerAdapter = (InfinitePagerAdapter) mViewPager.getAdapter();
count = infinitePagerAdapter.getRealCount();
}
// ==================================================================
if (count == 0)
{
return;
}
if (mCurrentPage >= count)
{
setCurrentItem(count - 1);
return;
}
int longSize;
int longPaddingBefore;
int longPaddingAfter;
int shortPaddingBefore;
if (mOrientation == HORIZONTAL)
{
longSize = getWidth();
longPaddingBefore = getPaddingLeft();
longPaddingAfter = getPaddingRight();
shortPaddingBefore = getPaddingTop();
}
else
{
longSize = getHeight();
longPaddingBefore = getPaddingTop();
longPaddingAfter = getPaddingBottom();
shortPaddingBefore = getPaddingLeft();
}
final float threeRadius = mRadius * 3;
final float shortOffset = shortPaddingBefore + mRadius;
float longOffset = longPaddingBefore + mRadius;
if (mCentered)
{
longOffset += ((longSize - longPaddingBefore - longPaddingAfter) / 2.0f) - ((count * threeRadius) / 2.0f);
}
float dX;
float dY;
float pageFillRadius = mRadius;
if (mPaintStroke.getStrokeWidth() > 0)
{
pageFillRadius -= mPaintStroke.getStrokeWidth() / 2.0f;
}
// Draw stroked circles
for (int iLoop = 0; iLoop < count; iLoop++)
{
float drawLong = longOffset + (iLoop * threeRadius);
if (mOrientation == HORIZONTAL)
{
dX = drawLong;
dY = shortOffset;
}
else
{
dX = shortOffset;
dY = drawLong;
}
// Only paint fill if not completely transparent
if (mPaintPageFill.getAlpha() > 0)
{
canvas.drawCircle(dX, dY, pageFillRadius, mPaintPageFill);
}
// Only paint stroke if a stroke width was non-zero
if (pageFillRadius != mRadius)
{
canvas.drawCircle(dX, dY, mRadius, mPaintStroke);
}
}
// Draw the filled circle according to the current scroll
float cx = (mSnap ? mSnapPage : mCurrentPage) * threeRadius;
if (!mSnap)
{
cx += mPageOffset * threeRadius;
}
if (mOrientation == HORIZONTAL)
{
dX = longOffset + cx;
dY = shortOffset;
}
else
{
dX = shortOffset;
dY = longOffset + cx;
}
canvas.drawCircle(dX, dY, mRadius, mPaintFill);
}
public boolean onTouchEvent(android.view.MotionEvent ev)
{
if (super.onTouchEvent(ev))
{
return true;
}
if ((mViewPager == null) || (mViewPager.getAdapter().getCount() == 0))
{
return false;
}
final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;
switch (action)
{
case MotionEvent.ACTION_DOWN:
mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
mLastMotionX = ev.getX();
break;
case MotionEvent.ACTION_MOVE:
{
final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
final float x = MotionEventCompat.getX(ev, activePointerIndex);
final float deltaX = x - mLastMotionX;
if (!mIsDragging)
{
if (Math.abs(deltaX) > mTouchSlop)
{
mIsDragging = true;
}
}
if (mIsDragging)
{
mLastMotionX = x;
if (mViewPager.isFakeDragging() || mViewPager.beginFakeDrag())
{
mViewPager.fakeDragBy(deltaX);
}
}
break;
}
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
if (!mIsDragging)
{
final int count = mViewPager.getAdapter().getCount();
final int width = getWidth();
final float halfWidth = width / 2f;
final float sixthWidth = width / 6f;
if ((mCurrentPage > 0) && (ev.getX() < halfWidth - sixthWidth))
{
if (action != MotionEvent.ACTION_CANCEL)
{
mViewPager.setCurrentItem(mCurrentPage - 1);
}
return true;
}
else if ((mCurrentPage < count - 1) && (ev.getX() > halfWidth + sixthWidth))
{
if (action != MotionEvent.ACTION_CANCEL)
{
mViewPager.setCurrentItem(mCurrentPage + 1);
}
return true;
}
}
mIsDragging = false;
mActivePointerId = INVALID_POINTER;
if (mViewPager.isFakeDragging())
mViewPager.endFakeDrag();
break;
case MotionEventCompat.ACTION_POINTER_DOWN:
{
final int index = MotionEventCompat.getActionIndex(ev);
mLastMotionX = MotionEventCompat.getX(ev, index);
mActivePointerId = MotionEventCompat.getPointerId(ev, index);
break;
}
case MotionEventCompat.ACTION_POINTER_UP:
final int pointerIndex = MotionEventCompat.getActionIndex(ev);
final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex);
if (pointerId == mActivePointerId)
{
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex);
}
mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
break;
}
return true;
}
public void setViewPager(ViewPagerEx view)
{
if (mViewPager == view)
{
return;
}
if (mViewPager != null)
{
mViewPager.setOnPageChangeListener(null);
}
if (view.getAdapter() == null)
{
throw new IllegalStateException("ViewPager does not have adapter instance.");
}
mViewPager = view;
mViewPager.setOnPageChangeListener(mListener);
invalidate();
}
public void setViewPager(ViewPagerEx view, int initialPosition)
{
setViewPager(view);
setCurrentItem(initialPosition);
}
public void setCurrentItem(int item)
{
if (mViewPager == null)
{
throw new IllegalStateException("ViewPager has not been bound.");
}
mViewPager.setCurrentItem(item);
mCurrentPage = item;
invalidate();
}
public void setCurrentItem(int item , boolean isInfinite)
{
if (mViewPager == null)
{
throw new IllegalStateException("ViewPager has not been bound.");
}
if(!isInfinite)
{
mViewPager.setCurrentItem(item);
}
mCurrentPage = item;
invalidate();
}
public void notifyDataSetChanged()
{
invalidate();
}
public void onPageScrollStateChanged(int state)
{
mScrollState = state;
if (mListener != null)
{
mListener.onPageScrollStateChanged(state);
}
}
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels)
{
mCurrentPage = position;
mPageOffset = positionOffset;
invalidate();
if (mListener != null)
{
mListener.onPageScrolled(position, positionOffset, positionOffsetPixels);
}
}
public void onPageSelected(int position)
{
if (mSnap || mScrollState == ViewPager.SCROLL_STATE_IDLE)
{
mCurrentPage = position;
mSnapPage = position;
invalidate();
}
if (mListener != null)
{
mListener.onPageSelected(position);
}
}
public void setOnPageChangeListener(ViewPagerEx.OnPageChangeListener listener)
{
mListener = listener;
}
/*
* (non-Javadoc)
* @see android.view.View#onMeasure(int, int)
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
if (mOrientation == HORIZONTAL)
{
setMeasuredDimension(measureLong(widthMeasureSpec), measureShort(heightMeasureSpec));
}
else
{
setMeasuredDimension(measureShort(widthMeasureSpec), measureLong(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 measureLong(int measureSpec)
{
int result;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if ((specMode == MeasureSpec.EXACTLY) || (mViewPager == null))
{
// We were told how big to be
result = specSize;
}
else
{
// Calculate the width according the views count
final int count = mViewPager.getAdapter().getCount();
result = (int) (getPaddingLeft() + getPaddingRight() + (count * 2 * mRadius) + (count - 1) * mRadius + 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 measureShort(int measureSpec)
{
int result;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.EXACTLY)
{
// We were told how big to be
result = specSize;
}
else
{
// Measure the height
result = (int) (2 * mRadius + 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;
}
@Override
public void onRestoreInstanceState(Parcelable state)
{
SavedState savedState = (SavedState) state;
super.onRestoreInstanceState(savedState.getSuperState());
mCurrentPage = savedState.currentPage;
mSnapPage = savedState.currentPage;
requestLayout();
}
@Override
public Parcelable onSaveInstanceState()
{
Parcelable superState = super.onSaveInstanceState();
SavedState savedState = new SavedState(superState);
savedState.currentPage = mCurrentPage;
return savedState;
}
static class SavedState extends BaseSavedState
{
int currentPage;
public SavedState(Parcelable superState)
{
super(superState);
}
private SavedState(Parcel in)
{
super(in);
currentPage = in.readInt();
}
@Override
public void writeToParcel(Parcel dest, int flags)
{
super.writeToParcel(dest, flags);
dest.writeInt(currentPage);
}
@SuppressWarnings("UnusedDeclaration")
public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>()
{
@Override
public SavedState createFromParcel(Parcel in)
{
return new SavedState(in);
}
@Override
public SavedState[] newArray(int size)
{
return new SavedState[size];
}
};
}
}