Permissions Watch settings UI port

This CL contains all the UI elements needed to build the Wear
version of the Settings UI for permissions.

The actual implementation for the Wear version of SettingsUI
will be done in a follow up bug.

This is basically a straight port from our Settings app and
wearable-support lib.  I tweaked two strings and changed
the package paths to make it easier to group the files
together.

BUG: 23080561

Change-Id: I6d72d29dd1926ad07d63f85b52ccf9f72ff70df1

1 files changed, 176 insertions, 0 deletions

diff --git a/src/android/support/wearable/view/ProgressDrawable.java b/src/android/support/wearable/view/ProgressDrawable.java
new file mode 100644
index 00000000..63e6a039
--- /dev/null
+++ b/src/android/support/wearable/view/ProgressDrawable.java
@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2015 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 android.support.wearable.view;
+
+import android.animation.ObjectAnimator;
+import android.animation.TimeInterpolator;
+import android.animation.ValueAnimator;
+import android.annotation.TargetApi;
+import android.graphics.Canvas;
+import android.graphics.ColorFilter;
+import android.graphics.Paint;
+import android.graphics.PixelFormat;
+import android.graphics.RectF;
+import android.graphics.drawable.Drawable;
+import android.os.Build;
+import android.util.Property;
+import android.view.animation.LinearInterpolator;
+
+/**
+ * Drawable for showing an indeterminate progress indicator.
+ *
+ * TODO: When Material progress drawable is available in the support library stop using this.
+ *
+ * @hide
+ */
+@TargetApi(Build.VERSION_CODES.KITKAT_WATCH)
+class ProgressDrawable extends Drawable {
+
+    private static Property<ProgressDrawable, Integer> LEVEL =
+            new Property<ProgressDrawable, Integer>(Integer.class, "level") {
+        @Override
+        public Integer get(ProgressDrawable drawable) {
+            return drawable.getLevel();
+        }
+
+        @Override
+        public void set(ProgressDrawable drawable, Integer value) {
+            drawable.setLevel(value);
+            drawable.invalidateSelf();
+        }
+    };
+    /** Max level for a level drawable, as specified in developer docs for {@link Drawable}. */
+    private static final int MAX_LEVEL = 10000;
+
+    /** How many different sections are there, five gives us the material style star. **/
+    private static final int NUMBER_OF_SEGMENTS = 5;
+
+    private static final int LEVELS_PER_SEGMENT = MAX_LEVEL / NUMBER_OF_SEGMENTS;
+    private static final float STARTING_ANGLE = -90f;
+    private static final long ANIMATION_DURATION = 6000;
+    private static final int FULL_CIRCLE = 360;
+    private static final int MAX_SWEEP = 306;
+    private static final int CORRECTION_ANGLE = FULL_CIRCLE - MAX_SWEEP;
+    /** How far through each cycle does the bar stop growing and start shrinking, half way. **/
+    private static final float GROW_SHRINK_RATIO = 0.5f;
+    // TODO: replace this with BakedBezierInterpolator when its available in support library.
+    private static final TimeInterpolator mInterpolator = Gusterpolator.INSTANCE;
+
+    private final RectF mInnerCircleBounds = new RectF();
+    private final Paint mPaint = new Paint();
+    private final ObjectAnimator mAnimator;
+    private float mCircleBorderWidth;
+    private int mCircleBorderColor;
+
+    public ProgressDrawable() {
+        mPaint.setAntiAlias(true);
+        mPaint.setStyle(Paint.Style.STROKE);
+        mAnimator = ObjectAnimator.ofInt(this, LEVEL, 0, MAX_LEVEL);
+        mAnimator.setRepeatCount(ValueAnimator.INFINITE);
+        mAnimator.setRepeatMode(ValueAnimator.RESTART);
+        mAnimator.setDuration(ANIMATION_DURATION);
+        mAnimator.setInterpolator(new LinearInterpolator());
+    }
+
+    public void setRingColor(int color) {
+        mCircleBorderColor = color;
+    }
+
+    public void setRingWidth(float width) {
+        mCircleBorderWidth = width;
+    }
+
+    public void startAnimation() {
+        mAnimator.start();
+    }
+
+    public void stopAnimation() {
+        mAnimator.cancel();
+    }
+
+    @Override
+    public void draw(Canvas canvas) {
+        canvas.save();
+        mInnerCircleBounds.set(getBounds());
+        mInnerCircleBounds.inset(mCircleBorderWidth / 2.0f, mCircleBorderWidth / 2.0f);
+        mPaint.setStrokeWidth(mCircleBorderWidth);
+        mPaint.setColor(mCircleBorderColor);
+
+        float sweepAngle = FULL_CIRCLE;
+        boolean growing = false;
+        float correctionAngle = 0;
+        int level = getLevel();
+
+        int currentSegment = level / LEVELS_PER_SEGMENT;
+        int offset = currentSegment * LEVELS_PER_SEGMENT;
+        float progress = (level - offset) / (float) LEVELS_PER_SEGMENT;
+
+        growing = progress < GROW_SHRINK_RATIO;
+        correctionAngle = CORRECTION_ANGLE * progress;
+
+        if (growing) {
+            sweepAngle = MAX_SWEEP * mInterpolator.getInterpolation(
+                    lerpInv(0f, GROW_SHRINK_RATIO, progress));
+        } else {
+            sweepAngle = MAX_SWEEP * (1.0f - mInterpolator.getInterpolation(
+                    lerpInv(GROW_SHRINK_RATIO, 1.0f, progress)));
+        }
+
+        sweepAngle = Math.max(1, sweepAngle);
+
+        canvas.rotate(
+                level * (1.0f / MAX_LEVEL) * 2 * FULL_CIRCLE + STARTING_ANGLE + correctionAngle,
+                mInnerCircleBounds.centerX(),
+                mInnerCircleBounds.centerY());
+        canvas.drawArc(mInnerCircleBounds,
+                growing ? 0 : MAX_SWEEP - sweepAngle,
+                sweepAngle,
+                false,
+                mPaint);
+        canvas.restore();
+    }
+
+    @Override
+    public void setAlpha(int i) {
+        // Not supported.
+    }
+
+    @Override
+    public void setColorFilter(ColorFilter colorFilter) {
+        // Not supported.
+    }
+
+    @Override
+    public int getOpacity() {
+        return PixelFormat.OPAQUE;
+    }
+
+    @Override
+    protected boolean onLevelChange(int level) {
+        return true; // Changing the level of this drawable does change its appearance.
+    }
+
+    /**
+     * Returns the interpolation scalar (s) that satisfies the equation:
+     * {@code value = }lerp(a, b, s)
+     *
+     * <p>If {@code a == b}, then this function will return 0.
+     */
+    private static float lerpInv(float a, float b, float value) {
+        return a != b ? ((value - a) / (b - a)) : 0.0f;
+    }
+}