[Android] Import Android's SwipeRefreshLayout

third_party/android_swipe_refresh/java/src/chromium/third_party/android/swiperefresh/MaterialProgressDrawable.java

Index: third_party/android_swipe_refresh/java/src/chromium/third_party/android/swiperefresh/MaterialProgressDrawable.java
diff --git a/third_party/android_swipe_refresh/java/src/chromium/third_party/android/swiperefresh/MaterialProgressDrawable.java b/third_party/android_swipe_refresh/java/src/chromium/third_party/android/swiperefresh/MaterialProgressDrawable.java
new file mode 100644
index 0000000000000000000000000000000000000000..2b29444f7c9f0baaea4c23d3bbac12fff0866824
--- /dev/null
+++ b/third_party/android_swipe_refresh/java/src/chromium/third_party/android/swiperefresh/MaterialProgressDrawable.java
@@ -0,0 +1,723 @@
+/*
+ * Copyright (C) 2014 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 org.chromium.third_party.android.swiperefresh;
+
+import android.view.animation.AccelerateDecelerateInterpolator;
+import android.view.animation.Interpolator;
+import android.view.animation.Animation;
+import android.view.animation.LinearInterpolator;
+import android.view.animation.Transformation;
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.ColorFilter;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import android.graphics.Paint.Style;
+import android.graphics.Path;
+import android.graphics.PixelFormat;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.graphics.drawable.Drawable;
+import android.graphics.drawable.Animatable;
+import android.support.annotation.IntDef;
+import android.support.annotation.NonNull;
+import android.util.DisplayMetrics;
+import android.view.View;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.util.ArrayList;
+
+/**
+ * Fancy progress indicator for Material theme.
+ *
+ * @hide 
+ */
+class MaterialProgressDrawable extends Drawable implements Animatable {
+    private static final Interpolator LINEAR_INTERPOLATOR = new LinearInterpolator();
+    private static final Interpolator END_CURVE_INTERPOLATOR = new EndCurveInterpolator();
+    private static final Interpolator START_CURVE_INTERPOLATOR = new StartCurveInterpolator();
+    private static final Interpolator EASE_INTERPOLATOR = new AccelerateDecelerateInterpolator();
+
+    @Retention(RetentionPolicy.CLASS)
+    @IntDef({LARGE, DEFAULT})
+    public @interface ProgressDrawableSize {}
+    // Maps to ProgressBar.Large style
+    static final int LARGE = 0;
+    // Maps to ProgressBar default style
+    static final int DEFAULT = 1;
+
+    // Maps to ProgressBar default style
+    private static final int CIRCLE_DIAMETER = 40;
+    private static final float CENTER_RADIUS = 8.75f; //should add up to 10 when + stroke_width
+    private static final float STROKE_WIDTH = 2.5f;
+
+    // Maps to ProgressBar.Large style
+    private static final int CIRCLE_DIAMETER_LARGE = 56;
+    private static final float CENTER_RADIUS_LARGE = 12.5f;
+    private static final float STROKE_WIDTH_LARGE = 3f;
+
+    private final int[] COLORS = new int[] {
+        Color.BLACK
+    };
+
+    /** The duration of a single progress spin in milliseconds. */
+    private static final int ANIMATION_DURATION = 1000 * 80 / 60;
+
+    /** The number of points in the progress "star". */
+    private static final float NUM_POINTS = 5f;
+    /** The list of animators operating on this drawable. */
+    private final ArrayList<Animation> mAnimators = new ArrayList<Animation>();
+
+    /** The indicator ring, used to manage animation state. */
+    private final Ring mRing;
+
+    /** Canvas rotation in degrees. */
+    private float mRotation;
+
+    /** Layout info for the arrowhead in dp */
+    private static final int ARROW_WIDTH = 10;
+    private static final int ARROW_HEIGHT = 5;
+    private static final float ARROW_OFFSET_ANGLE = 5;
+
+    /** Layout info for the arrowhead for the large spinner in dp */
+    private static final int ARROW_WIDTH_LARGE = 12;
+    private static final int ARROW_HEIGHT_LARGE = 6;
+    private static final float MAX_PROGRESS_ARC = .8f;
+
+    private Resources mResources;
+    private View mParent;
+    private Animation mAnimation;
+    private float mRotationCount;
+    private double mWidth;
+    private double mHeight;
+    private Animation mFinishAnimation;
+
+    public MaterialProgressDrawable(Context context, View parent) {
+        mParent = parent;
+        mResources = context.getResources();
+
+        mRing = new Ring(mCallback);
+        mRing.setColors(COLORS);
+
+        updateSizes(DEFAULT);
+        setupAnimators();
+    }
+
+    private void setSizeParameters(double progressCircleWidth, double progressCircleHeight,
+            double centerRadius, double strokeWidth, float arrowWidth, float arrowHeight) {
+        final Ring ring = mRing;
+        final DisplayMetrics metrics = mResources.getDisplayMetrics();
+        final float screenDensity = metrics.density;
+
+        mWidth = progressCircleWidth * screenDensity;
+        mHeight = progressCircleHeight * screenDensity;
+        ring.setStrokeWidth((float) strokeWidth * screenDensity);
+        ring.setCenterRadius(centerRadius * screenDensity);
+        ring.setColorIndex(0);
+        ring.setArrowDimensions(arrowWidth * screenDensity, arrowHeight * screenDensity);
+        ring.setInsets((int) mWidth, (int) mHeight);
+    }
+
+    /**
+     * Set the overall size for the progress spinner. This updates the radius
+     * and stroke width of the ring.
+     *
+     * @param size One of {@link MaterialProgressDrawable.LARGE} or
+     *            {@link MaterialProgressDrawable.DEFAULT}
+     */
+    public void updateSizes(@ProgressDrawableSize int size) {
+        if (size == LARGE) {
+            setSizeParameters(CIRCLE_DIAMETER_LARGE, CIRCLE_DIAMETER_LARGE, CENTER_RADIUS_LARGE,
+                    STROKE_WIDTH_LARGE, ARROW_WIDTH_LARGE, ARROW_HEIGHT_LARGE);
+        } else {
+            setSizeParameters(CIRCLE_DIAMETER, CIRCLE_DIAMETER, CENTER_RADIUS, STROKE_WIDTH,
+                    ARROW_WIDTH, ARROW_HEIGHT);
+        }
+    }
+
+    /**
+     * @param show Set to true to display the arrowhead on the progress spinner.
+     */
+    public void showArrow(boolean show) {
+        mRing.setShowArrow(show);
+    }
+
+    /**
+     * @param scale Set the scale of the arrowhead for the spinner.
+     */
+    public void setArrowScale(float scale) {
+        mRing.setArrowScale(scale);
+    }
+
+    /**
+     * Set the start and end trim for the progress spinner arc.
+     *
+     * @param startAngle start angle
+     * @param endAngle end angle
+     */
+    public void setStartEndTrim(float startAngle, float endAngle) {
+        mRing.setStartTrim(startAngle);
+        mRing.setEndTrim(endAngle);
+    }
+
+    /**
+     * Set the amount of rotation to apply to the progress spinner.
+     *
+     * @param rotation Rotation is from [0..1]
+     */
+    public void setProgressRotation(float rotation) {
+        mRing.setRotation(rotation);
+    }
+
+    /**
+     * Update the background color of the circle image view.
+     */
+    public void setBackgroundColor(int color) {
+        mRing.setBackgroundColor(color);
+     }
+
+    /**
+     * Set the colors used in the progress animation from color resources.
+     * The first color will also be the color of the bar that grows in response
+     * to a user swipe gesture.
+     *
+     * @param colors
+     */
+    public void setColorSchemeColors(int... colors) {
+        mRing.setColors(colors);
+        mRing.setColorIndex(0);
+    }
+
+    @Override
+    public int getIntrinsicHeight() {
+        return (int) mHeight;
+    }
+
+    @Override
+    public int getIntrinsicWidth() {
+        return (int) mWidth;
+    }
+
+    @Override
+    public void draw(Canvas c) {
+        final Rect bounds = getBounds();
+        final int saveCount = c.save();
+        c.rotate(mRotation, bounds.exactCenterX(), bounds.exactCenterY());
+        mRing.draw(c, bounds);
+        c.restoreToCount(saveCount);
+    }
+
+    @Override
+    public void setAlpha(int alpha) {
+        mRing.setAlpha(alpha);
+    }
+
+    public int getAlpha() {
+        return mRing.getAlpha();
+    }
+
+    @Override
+    public void setColorFilter(ColorFilter colorFilter) {
+        mRing.setColorFilter(colorFilter);
+    }
+
+    @SuppressWarnings("unused")
+    void setRotation(float rotation) {
+        mRotation = rotation;
+        invalidateSelf();
+    }
+
+    @SuppressWarnings("unused")
+    private float getRotation() {
+        return mRotation;
+    }
+
+    @Override
+    public int getOpacity() {
+        return PixelFormat.TRANSLUCENT;
+    }
+
+    @Override
+    public boolean isRunning() {
+        final ArrayList<Animation> animators = mAnimators;
+        final int N = animators.size();
+        for (int i = 0; i < N; i++) {
+            final Animation animator = animators.get(i);
+            if (animator.hasStarted() && !animator.hasEnded()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public void start() {
+        mAnimation.reset();
+        mRing.storeOriginals();
+        // Already showing some part of the ring
+        if (mRing.getEndTrim() != mRing.getStartTrim()) {
+            mParent.startAnimation(mFinishAnimation);
+        } else {
+            mRing.setColorIndex(0);
+            mRing.resetOriginals();
+            mParent.startAnimation(mAnimation);
+        }
+    }
+
+    @Override
+    public void stop() {
+        mParent.clearAnimation();
+        setRotation(0);
+        mRing.setShowArrow(false);
+        mRing.setColorIndex(0);
+        mRing.resetOriginals();
+    }
+
+    private void setupAnimators() {
+        final Ring ring = mRing;
+        final Animation finishRingAnimation = new Animation() {
+            public void applyTransformation(float interpolatedTime, Transformation t) {
+                // shrink back down and complete a full rotation before starting other circles
+                // Rotation goes between [0..1].
+                float targetRotation = (float) (Math.floor(ring.getStartingRotation()
+                        / MAX_PROGRESS_ARC) + 1f);
+                final float startTrim = ring.getStartingStartTrim()
+                        + (ring.getStartingEndTrim() - ring.getStartingStartTrim())
+                        * interpolatedTime;
+                ring.setStartTrim(startTrim);
+                final float rotation = ring.getStartingRotation()
+                        + ((targetRotation - ring.getStartingRotation()) * interpolatedTime);
+                ring.setRotation(rotation);
+                ring.setArrowScale(1 - interpolatedTime);
+            }
+        };
+        finishRingAnimation.setInterpolator(EASE_INTERPOLATOR);
+        finishRingAnimation.setDuration(ANIMATION_DURATION/2);
+        finishRingAnimation.setAnimationListener(new Animation.AnimationListener() {
+
+            @Override
+            public void onAnimationStart(Animation animation) {
+            }
+
+            @Override
+            public void onAnimationEnd(Animation animation) {
+                ring.goToNextColor();
+                ring.storeOriginals();
+                ring.setShowArrow(false);
+                mParent.startAnimation(mAnimation);
+            }
+
+            @Override
+            public void onAnimationRepeat(Animation animation) {
+            }
+        });
+        final Animation animation = new Animation() {
+            @Override
+            public void applyTransformation(float interpolatedTime, Transformation t) {
+                // The minProgressArc is calculated from 0 to create an angle that
+                // matches the stroke width.
+                final float minProgressArc = (float) Math.toRadians(ring.getStrokeWidth()
+                        / (2 * Math.PI * ring.getCenterRadius()));
+                final float startingEndTrim = ring.getStartingEndTrim();
+                final float startingTrim = ring.getStartingStartTrim();
+                final float startingRotation = ring.getStartingRotation();
+
+                // Offset the minProgressArc to where the endTrim is located.
+                final float minArc = MAX_PROGRESS_ARC - minProgressArc;
+                final float endTrim = startingEndTrim
+                        + (minArc * START_CURVE_INTERPOLATOR.getInterpolation(interpolatedTime));
+                ring.setEndTrim(endTrim);
+
+                final float startTrim = startingTrim
+                        + (MAX_PROGRESS_ARC * END_CURVE_INTERPOLATOR
+                                .getInterpolation(interpolatedTime));
+                ring.setStartTrim(startTrim);
+
+                final float rotation = startingRotation + (0.25f * interpolatedTime);
+                ring.setRotation(rotation);
+
+                float groupRotation = ((720.0f / NUM_POINTS) * interpolatedTime)
+                        + (720.0f * (mRotationCount / NUM_POINTS));
+                setRotation(groupRotation);
+            }
+        };
+        animation.setRepeatCount(Animation.INFINITE);
+        animation.setRepeatMode(Animation.RESTART);
+        animation.setInterpolator(LINEAR_INTERPOLATOR);
+        animation.setDuration(ANIMATION_DURATION);
+        animation.setAnimationListener(new Animation.AnimationListener() {
+
+            @Override
+            public void onAnimationStart(Animation animation) {
+                mRotationCount = 0;
+            }
+
+            @Override
+            public void onAnimationEnd(Animation animation) {
+                // do nothing
+            }
+
+            @Override
+            public void onAnimationRepeat(Animation animation) {
+                ring.storeOriginals();
+                ring.goToNextColor();
+                ring.setStartTrim(ring.getEndTrim());
+                mRotationCount = (mRotationCount + 1) % (NUM_POINTS);
+            }
+        });
+        mFinishAnimation = finishRingAnimation;
+        mAnimation = animation;
+    }
+
+    private final Callback mCallback = new Callback() {
+        @Override
+        public void invalidateDrawable(Drawable d) {
+            invalidateSelf();
+        }
+
+        @Override
+        public void scheduleDrawable(Drawable d, Runnable what, long when) {
+            scheduleSelf(what, when);
+        }
+
+        @Override
+        public void unscheduleDrawable(Drawable d, Runnable what) {
+            unscheduleSelf(what);
+        }
+    };
+
+    private static class Ring {
+        private final RectF mTempBounds = new RectF();
+        private final Paint mPaint = new Paint();
+        private final Paint mArrowPaint = new Paint();
+
+        private final Callback mCallback;
+
+        private float mStartTrim = 0.0f;
+        private float mEndTrim = 0.0f;
+        private float mRotation = 0.0f;
+        private float mStrokeWidth = 5.0f;
+        private float mStrokeInset = 2.5f;
+
+        private int[] mColors;
+        // mColorIndex represents the offset into the available mColors that the
+        // progress circle should currently display. As the progress circle is
+        // animating, the mColorIndex moves by one to the next available color.
+        private int mColorIndex;
+        private float mStartingStartTrim;
+        private float mStartingEndTrim;
+        private float mStartingRotation;
+        private boolean mShowArrow;
+        private Path mArrow;
+        private float mArrowScale;
+        private double mRingCenterRadius;
+        private int mArrowWidth;
+        private int mArrowHeight;
+        private int mAlpha;
+        private final Paint mCirclePaint = new Paint();
+        private int mBackgroundColor;
+
+        public Ring(Callback callback) {
+            mCallback = callback;
+
+            mPaint.setStrokeCap(Paint.Cap.SQUARE);
+            mPaint.setAntiAlias(true);
+            mPaint.setStyle(Style.STROKE);
+
+            mArrowPaint.setStyle(Paint.Style.FILL);
+            mArrowPaint.setAntiAlias(true);
+        }
+
+        public void setBackgroundColor(int color) {
+            mBackgroundColor = color;
+        }
+
+        /**
+         * Set the dimensions of the arrowhead.
+         *
+         * @param width Width of the hypotenuse of the arrow head
+         * @param height Height of the arrow point
+         */
+        public void setArrowDimensions(float width, float height) {
+            mArrowWidth = (int) width;
+            mArrowHeight = (int) height;
+        }
+
+        /**
+         * Draw the progress spinner
+         */
+        public void draw(Canvas c, Rect bounds) {
+            final RectF arcBounds = mTempBounds;
+            arcBounds.set(bounds);
+            arcBounds.inset(mStrokeInset, mStrokeInset);
+
+            final float startAngle = (mStartTrim + mRotation) * 360;
+            final float endAngle = (mEndTrim + mRotation) * 360;
+            float sweepAngle = endAngle - startAngle;
+
+            mPaint.setColor(mColors[mColorIndex]);
+            c.drawArc(arcBounds, startAngle, sweepAngle, false, mPaint);
+
+            drawTriangle(c, startAngle, sweepAngle, bounds);
+
+            if (mAlpha < 255) {
+                mCirclePaint.setColor(mBackgroundColor);
+                mCirclePaint.setAlpha(255 - mAlpha);
+                c.drawCircle(bounds.exactCenterX(), bounds.exactCenterY(), bounds.width() / 2,
+                        mCirclePaint);
+            }
+        }
+
+        private void drawTriangle(Canvas c, float startAngle, float sweepAngle, Rect bounds) {
+            if (mShowArrow) {
+                if (mArrow == null) {
+                    mArrow = new android.graphics.Path();
+                    mArrow.setFillType(android.graphics.Path.FillType.EVEN_ODD);
+                } else {
+                    mArrow.reset();
+                }
+
+                // Adjust the position of the triangle so that it is inset as
+                // much as the arc, but also centered on the arc.
+                float inset = (int) mStrokeInset / 2 * mArrowScale;
+                float x = (float) (mRingCenterRadius * Math.cos(0) + bounds.exactCenterX());
+                float y = (float) (mRingCenterRadius * Math.sin(0) + bounds.exactCenterY());
+
+                // Update the path each time. This works around an issue in SKIA
+                // where concatenating a rotation matrix to a scale matrix
+                // ignored a starting negative rotation. This appears to have
+                // been fixed as of API 21.
+                mArrow.moveTo(0, 0);
+                mArrow.lineTo(mArrowWidth * mArrowScale, 0);
+                mArrow.lineTo((mArrowWidth * mArrowScale / 2), (mArrowHeight
+                        * mArrowScale));
+                mArrow.offset(x - inset, y);
+                mArrow.close();
+                // draw a triangle
+                mArrowPaint.setColor(mColors[mColorIndex]);
+                c.rotate(startAngle + sweepAngle - ARROW_OFFSET_ANGLE, bounds.exactCenterX(),
+                        bounds.exactCenterY());
+                c.drawPath(mArrow, mArrowPaint);
+            }
+        }
+
+        /**
+         * Set the colors the progress spinner alternates between.
+         *
+         * @param colors Array of integers describing the colors. Must be non-<code>null</code>.
+         */
+        public void setColors(@NonNull int[] colors) {
+            mColors = colors;
+            // if colors are reset, make sure to reset the color index as well
+            setColorIndex(0);
+        }
+
+        /**
+         * @param index Index into the color array of the color to display in
+         *            the progress spinner.
+         */
+        public void setColorIndex(int index) {
+            mColorIndex = index;
+        }
+
+        /**
+         * Proceed to the next available ring color. This will automatically
+         * wrap back to the beginning of colors.
+         */
+        public void goToNextColor() {
+            mColorIndex = (mColorIndex + 1) % (mColors.length);
+        }
+
+        public void setColorFilter(ColorFilter filter) {
+            mPaint.setColorFilter(filter);
+            invalidateSelf();
+        }
+
+        /**
+         * @param alpha Set the alpha of the progress spinner and associated arrowhead.
+         */
+        public void setAlpha(int alpha) {
+            mAlpha = alpha;
+        }
+
+        /**
+         * @return Current alpha of the progress spinner and arrowhead.
+         */
+        public int getAlpha() {
+            return mAlpha;
+        }
+
+        /**
+         * @param strokeWidth Set the stroke width of the progress spinner in pixels.
+         */
+        public void setStrokeWidth(float strokeWidth) {
+            mStrokeWidth = strokeWidth;
+            mPaint.setStrokeWidth(strokeWidth);
+            invalidateSelf();
+        }
+
+        @SuppressWarnings("unused")
+        public float getStrokeWidth() {
+            return mStrokeWidth;
+        }
+
+        @SuppressWarnings("unused")
+        public void setStartTrim(float startTrim) {
+            mStartTrim = startTrim;
+            invalidateSelf();
+        }
+
+        @SuppressWarnings("unused")
+        public float getStartTrim() {
+            return mStartTrim;
+        }
+
+        public float getStartingStartTrim() {
+            return mStartingStartTrim;
+        }
+
+        public float getStartingEndTrim() {
+            return mStartingEndTrim;
+        }
+
+        @SuppressWarnings("unused")
+        public void setEndTrim(float endTrim) {
+            mEndTrim = endTrim;
+            invalidateSelf();
+        }
+
+        @SuppressWarnings("unused")
+        public float getEndTrim() {
+            return mEndTrim;
+        }
+
+        @SuppressWarnings("unused")
+        public void setRotation(float rotation) {
+            mRotation = rotation;
+            invalidateSelf();
+        }
+
+        @SuppressWarnings("unused")
+        public float getRotation() {
+            return mRotation;
+        }
+
+        public void setInsets(int width, int height) {
+            final float minEdge = (float) Math.min(width, height);
+            float insets;
+            if (mRingCenterRadius <= 0 || minEdge < 0) {
+                insets = (float) Math.ceil(mStrokeWidth / 2.0f);
+            } else {
+                insets = (float) (minEdge / 2.0f - mRingCenterRadius);
+            }
+            mStrokeInset = insets;
+        }
+
+        @SuppressWarnings("unused")
+        public float getInsets() {
+            return mStrokeInset;
+        }
+
+        /**
+         * @param centerRadius Inner radius in px of the circle the progress
+         *            spinner arc traces.
+         */
+        public void setCenterRadius(double centerRadius) {
+            mRingCenterRadius = centerRadius;
+        }
+
+        public double getCenterRadius() {
+            return mRingCenterRadius;
+        }
+
+        /**
+         * @param show Set to true to show the arrow head on the progress spinner.
+         */
+        public void setShowArrow(boolean show) {
+            if (mShowArrow != show) {
+                mShowArrow = show;
+                invalidateSelf();
+            }
+        }
+
+        /**
+         * @param scale Set the scale of the arrowhead for the spinner.
+         */
+        public void setArrowScale(float scale) {
+            if (scale != mArrowScale) {
+                mArrowScale = scale;
+                invalidateSelf();
+            }
+        }
+
+        /**
+         * @return The amount the progress spinner is currently rotated, between [0..1].
+         */
+        public float getStartingRotation() {
+            return mStartingRotation;
+        }
+
+        /**
+         * If the start / end trim are offset to begin with, store them so that
+         * animation starts from that offset.
+         */
+        public void storeOriginals() {
+            mStartingStartTrim = mStartTrim;
+            mStartingEndTrim = mEndTrim;
+            mStartingRotation = mRotation;
+        }
+
+        /**
+         * Reset the progress spinner to default rotation, start and end angles.
+         */
+        public void resetOriginals() {
+            mStartingStartTrim = 0;
+            mStartingEndTrim = 0;
+            mStartingRotation = 0;
+            setStartTrim(0);
+            setEndTrim(0);
+            setRotation(0);
+        }
+
+        private void invalidateSelf() {
+            mCallback.invalidateDrawable(null);
+        }
+    }
+
+    /**
+     * Squishes the interpolation curve into the second half of the animation.
+     */
+    private static class EndCurveInterpolator extends AccelerateDecelerateInterpolator {
+        @Override
+        public float getInterpolation(float input) {
+            return super.getInterpolation(Math.max(0, (input - 0.5f) * 2.0f));
+        }
+    }
+
+    /**
+     * Squishes the interpolation curve into the first half of the animation.
+     */
+    private static class StartCurveInterpolator extends AccelerateDecelerateInterpolator {
+        @Override
+        public float getInterpolation(float input) {
+            return super.getInterpolation(Math.min(1, input * 2.0f));
+        }
+    }
+}