1 files changed, 505 insertions, 0 deletions
diff --git a/src/org/cyanogenmod/audiofx/viewpagerindicator/CirclePageIndicator.java b/src/org/cyanogenmod/audiofx/viewpagerindicator/CirclePageIndicator.java
new file mode 100644
index 0000000..cc69325
--- /dev/null
+++ b/src/org/cyanogenmod/audiofx/viewpagerindicator/CirclePageIndicator.java
@@ -0,0 +1,505 @@
+/*
+ * Copyright (C) 2011 Patrik Akerfeldt
+ * Copyright (C) 2011 Jake Wharton
+ *
+ * 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.cyanogenmod.audiofx.viewpagerindicator;
+
+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.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 org.cyanogenmod.audiofx.R;
+
+import static android.graphics.Paint.ANTI_ALIAS_FLAG;
+import static android.widget.LinearLayout.HORIZONTAL;
+import static android.widget.LinearLayout.VERTICAL;
+
+/**
+ * Draws circles (one for each view). The current view position is filled and
+ * others are only stroked.
+ */
+public class CirclePageIndicator extends View implements PageIndicator {
+    private static final int INVALID_POINTER = -1;
+
+    private float mRadius;
+    private final Paint mPaintPageFill = new Paint(ANTI_ALIAS_FLAG);
+    private final Paint mPaintStroke = new Paint(ANTI_ALIAS_FLAG);
+    private final Paint mPaintFill = new Paint(ANTI_ALIAS_FLAG);
+    private ViewPager mViewPager;
+    private ViewPager.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;
+
+        //Load defaults from resources
+        final Resources res = getResources();
+        final int defaultPageColor = res.getColor(R.color.default_circle_indicator_page_color);
+        final int defaultFillColor = res.getColor(R.color.default_circle_indicator_fill_color);
+        final int defaultOrientation = res.getInteger(R.integer.default_circle_indicator_orientation);
+        final int defaultStrokeColor = res.getColor(R.color.default_circle_indicator_stroke_color);
+        final float defaultStrokeWidth = res.getDimension(R.dimen.default_circle_indicator_stroke_width);
+        final float defaultRadius = res.getDimension(R.dimen.default_circle_indicator_radius);
+        final boolean defaultCentered = res.getBoolean(R.bool.default_circle_indicator_centered);
+        final boolean defaultSnap = res.getBoolean(R.bool.default_circle_indicator_snap);
+
+        //Retrieve styles attributes
+        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CirclePageIndicator, defStyle, 0);
+
+        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);
+        }
+
+        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;
+        }
+        final int count = mViewPager.getAdapter().getCount();
+        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, (float) (pageFillRadius/1.5f), 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;
+    }
+
+    @Override
+    public void setViewPager(ViewPager 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(this);
+        invalidate();
+    }
+
+    @Override
+    public void setViewPager(ViewPager view, int initialPosition) {
+        setViewPager(view);
+        setCurrentItem(initialPosition);
+    }
+
+    @Override
+    public void setCurrentItem(int item) {
+        if (mViewPager == null) {
+            throw new IllegalStateException("ViewPager has not been bound.");
+        }
+        mViewPager.setCurrentItem(item);
+        mCurrentPage = item;
+        invalidate();
+    }
+
+    @Override
+    public void notifyDataSetChanged() {
+        invalidate();
+    }
+
+    @Override
+    public void onPageScrollStateChanged(int state) {
+        mScrollState = state;
+
+        if (mListener != null) {
+            mListener.onPageScrollStateChanged(state);
+        }
+    }
+
+    @Override
+    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+        mCurrentPage = position;
+        mPageOffset = positionOffset;
+        invalidate();
+
+        if (mListener != null) {
+            mListener.onPageScrolled(position, positionOffset, positionOffsetPixels);
+        }
+    }
+
+    @Override
+    public void onPageSelected(int position) {
+        if (mSnap || mScrollState == ViewPager.SCROLL_STATE_IDLE) {
+            mCurrentPage = position;
+            mSnapPage = position;
+            invalidate();
+        }
+
+        if (mListener != null) {
+            mListener.onPageSelected(position);
+        }
+    }
+
+    @Override
+    public void setOnPageChangeListener(ViewPager.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;
+    }
+}