SemiClosedSlidingDrawer.java

/*
 * Copyright (C) 2008 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 se.smartrefill.view;

import java.lang.reflect.Method;

import se.smartrefill.app.x.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.SoundEffectConstants;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;

/**
 * This is a modified version of {@link SlidingDrawer} that supports the use
 * case to show a part of the content also when the drawer is closed/collapsed.
 * Use the 'semiClosedContentSize' attribute to specify how much of the content
 * (preferably in dips) that should be visible in closed/collapsed mode.
 *
 * SlidingDrawer hides content out of the screen and allows the user to drag a
 * handle to bring the content on screen. SlidingDrawer can be used vertically
 * or horizontally.
 *
 * A special widget composed of two children views: the handle, that the users
 * drags, and the content, attached to the handle and dragged with it.
 *
 * SlidingDrawer should be used as an overlay inside layouts. This means
 * SlidingDrawer should only be used inside of a FrameLayout or a RelativeLayout
 * for instance. The size of the SlidingDrawer defines how much space the
 * content will occupy once slid out so SlidingDrawer should usually use
 * fill_parent for both its dimensions.
 *
 * Inside an XML layout, SlidingDrawer must define the id of the handle and of
 * the content:
 *
 * <pre class="prettyprint">
 * &lt;SlidingDrawer
 *     android:id="@+id/drawer"
 *     android:layout_width="fill_parent"
 *     android:layout_height="fill_parent"
 *
 *     android:handle="@+id/handle"
 *     android:content="@+id/content"&gt;
 *
 *     &lt;ImageView
 *         android:id="@id/handle"
 *         android:layout_width="88dip"
 *         android:layout_height="44dip" /&gt;
 *
 *     &lt;GridView
 *         android:id="@id/content"
 *         android:layout_width="fill_parent"
 *         android:layout_height="fill_parent" /&gt;
 *
 * &lt;/SlidingDrawer&gt;
 * </pre>
 *
 * @attr ref android.R.styleable#SlidingDrawer_content
 * @attr ref android.R.styleable#SlidingDrawer_handle
 * @attr ref android.R.styleable#SlidingDrawer_topOffset
 * @attr ref android.R.styleable#SlidingDrawer_bottomOffset
 * @attr ref android.R.styleable#SlidingDrawer_orientation
 * @attr ref android.R.styleable#SlidingDrawer_allowSingleTap
 * @attr ref android.R.styleable#SlidingDrawer_animateOnClick
 */
public class SemiClosedSlidingDrawer
    extends ViewGroup
{
    public static final int ORIENTATION_HORIZONTAL = 0;
    public static final int ORIENTATION_VERTICAL = 1;

    private static final int TAP_THRESHOLD = 6;
    private static final float MAXIMUM_TAP_VELOCITY = 100.0f;
    private static final float MAXIMUM_MINOR_VELOCITY = 150.0f;
    private static final float MAXIMUM_MAJOR_VELOCITY = 200.0f;
    private static final float MAXIMUM_ACCELERATION = 2000.0f;
    private static final int VELOCITY_UNITS = 1000;
    private static final int MSG_ANIMATE = 1000;
    private static final int ANIMATION_FRAME_DURATION = 1000 / 60;

    private static final int EXPANDED_FULL_OPEN = -10001;
    private static final int COLLAPSED_SEMI_CLOSED = -10003;

    private final int mHandleId;
    private final int mContentId;

    private View mHandle;
    private View mContent;

    private final Rect mFrame = new Rect();
    private final Rect mInvalidate = new Rect();
    private boolean mTracking;
    private boolean mLocked;

    private VelocityTracker mVelocityTracker;

    private boolean mVertical;
    private boolean mExpanded;
    private int mBottomOffset;
    private int mTopOffset;
    private int mHandleHeight;
    private int mHandleWidth;

    private int mSemiClosedContentSize;

    private OnDrawerOpenListener mOnDrawerOpenListener;
    private OnDrawerCloseListener mOnDrawerCloseListener;
    private OnDrawerScrollListener mOnDrawerScrollListener;

    private final Handler mHandler = new SlidingHandler();
    private float mAnimatedAcceleration;
    private float mAnimatedVelocity;
    private float mAnimationPosition;
    private long mAnimationLastTime;
    private long mCurrentAnimationTime;
    private int mTouchDelta;
    private boolean mAnimating;
    private boolean mAllowSingleTap;
    private boolean mAnimateOnClick;

    private final int mTapThreshold;
    private final int mMaximumTapVelocity;
    private final int mMaximumMinorVelocity;
    private final int mMaximumMajorVelocity;
    private final int mMaximumAcceleration;
    private final int mVelocityUnits;

    /**
     * Callback invoked when the drawer is opened.
     */
    public static interface OnDrawerOpenListener
    {
        /**
         * Invoked when the drawer becomes fully open.
         */
        public void onDrawerOpened();
    }

    /**
     * Callback invoked when the drawer is closed.
     */
    public static interface OnDrawerCloseListener
    {
        /**
         * Invoked when the drawer becomes fully closed.
         */
        public void onDrawerClosed();
    }

    /**
     * Callback invoked when the drawer is scrolled.
     */
    public static interface OnDrawerScrollListener
    {
        /**
         * Invoked when the user starts dragging/flinging the drawer's handle.
         */
        public void onScrollStarted();

        /**
         * Invoked when the user stops dragging/flinging the drawer's handle.
         */
        public void onScrollEnded();
    }

    /**
     * Creates a new SlidingDrawer from a specified set of attributes defined in
     * XML.
     *
     * @param context
     *            The application's environment.
     * @param attrs
     *            The attributes defined in XML.
     */
    public SemiClosedSlidingDrawer(Context context, AttributeSet attrs)
    {
        this(context, attrs, 0);
    }

    /**
     * Creates a new SlidingDrawer from a specified set of attributes defined in
     * XML.
     *
     * @param context
     *            The application's environment.
     * @param attrs
     *            The attributes defined in XML.
     * @param defStyle
     *            The style to apply to this widget.
     */
    public SemiClosedSlidingDrawer(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SemiClosedSlidingDrawer, defStyle, 0);

        String orientation = a.getString(R.styleable.SemiClosedSlidingDrawer_orientation);
        mVertical = (orientation != null && orientation.equals("vertical"));
        mBottomOffset = (int) a.getDimension(R.styleable.SemiClosedSlidingDrawer_bottomOffset, 0.0f);
        mTopOffset = (int) a.getDimension(R.styleable.SemiClosedSlidingDrawer_topOffset, 0.0f);
        mAllowSingleTap = a.getBoolean(R.styleable.SemiClosedSlidingDrawer_allowSingleTap, true);
        mAnimateOnClick = a.getBoolean(R.styleable.SemiClosedSlidingDrawer_animateOnClick, true);
        mSemiClosedContentSize = (int) a.getDimension(R.styleable.SemiClosedSlidingDrawer_semiClosedContentSize, 0.0f);

        int handleId = a.getResourceId(R.styleable.SemiClosedSlidingDrawer_handle, 0);
        if (handleId == 0)
        {
            throw new IllegalArgumentException("The handle attribute is required and must refer " + "to a valid child.");
        }

        int contentId = a.getResourceId(R.styleable.SemiClosedSlidingDrawer_content, 0);
        if (contentId == 0)
        {
            throw new IllegalArgumentException("The content attribute is required and must refer "
                            + "to a valid child.");
        }

        if (handleId == contentId)
        {
            throw new IllegalArgumentException("The content and handle attributes must refer "
                            + "to different children.");
        }

        mHandleId = handleId;
        mContentId = contentId;

        final float density = getResources().getDisplayMetrics().density;
        mTapThreshold = (int) (TAP_THRESHOLD * density + 0.5f);
        mMaximumTapVelocity = (int) (MAXIMUM_TAP_VELOCITY * density + 0.5f);
        mMaximumMinorVelocity = (int) (MAXIMUM_MINOR_VELOCITY * density + 0.5f);
        mMaximumMajorVelocity = (int) (MAXIMUM_MAJOR_VELOCITY * density + 0.5f);
        mMaximumAcceleration = (int) (MAXIMUM_ACCELERATION * density + 0.5f);
        mVelocityUnits = (int) (VELOCITY_UNITS * density + 0.5f);

        a.recycle();

        setAlwaysDrawnWithCacheEnabled(false);
    }

    @Override
    protected void onFinishInflate()
    {
        mHandle = findViewById(mHandleId);
        if (mHandle == null)
        {
            throw new IllegalArgumentException("The handle attribute is must refer to an" + " existing child.");
        }
        mHandle.setOnClickListener(new DrawerToggler());

        mContent = findViewById(mContentId);
        if (mContent == null)
        {
            throw new IllegalArgumentException("The content attribute is must refer to an" + " existing child.");
        }
        mContent.setVisibility(View.VISIBLE);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
        int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);

        int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
        int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);

        if (widthSpecMode == MeasureSpec.UNSPECIFIED || heightSpecMode == MeasureSpec.UNSPECIFIED)
        {
            throw new RuntimeException("SlidingDrawer cannot have UNSPECIFIED dimensions");
        }

        final View handle = mHandle;
        measureChild(handle, widthMeasureSpec, heightMeasureSpec);

        if (mVertical)
        {
            int height = heightSpecSize - handle.getMeasuredHeight() - mTopOffset;
            mContent.measure(MeasureSpec.makeMeasureSpec(widthSpecSize, MeasureSpec.EXACTLY),
                            MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
        }
        else
        {
            int width = widthSpecSize - handle.getMeasuredWidth() - mTopOffset;
            mContent.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
                            MeasureSpec.makeMeasureSpec(heightSpecSize, MeasureSpec.EXACTLY));
        }

        setMeasuredDimension(widthSpecSize, heightSpecSize);
    }

    @Override
    protected void dispatchDraw(Canvas canvas)
    {
        final long drawingTime = getDrawingTime();
        final View handle = mHandle;
        final boolean isVertical = mVertical;

        drawChild(canvas, handle, drawingTime);

        if (mTracking || mAnimating || !mExpanded)
        {
            final Bitmap cache = mContent.getDrawingCache();
            if (cache != null)
            {
                if (isVertical)
                {
                    canvas.drawBitmap(cache, 0, handle.getBottom(), null);
                }
                else
                {
                    canvas.drawBitmap(cache, handle.getRight(), 0, null);
                }
            }
            else
            {
                canvas.save();
                canvas.translate(isVertical ? 0 : handle.getLeft() - mTopOffset, isVertical ? handle.getTop()
                                - mTopOffset : 0);
                drawChild(canvas, mContent, drawingTime);
                canvas.restore();
            }
        }
        else if (mExpanded)
        {
            drawChild(canvas, mContent, drawingTime);
        }
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b)
    {
        if (mTracking)
        {
            return;
        }

        final int width = r - l;
        final int height = b - t;

        final View handle = mHandle;

        int childWidth = handle.getMeasuredWidth();
        int childHeight = handle.getMeasuredHeight();

        int childLeft;
        int childTop;

        final View content = mContent;

        if (mVertical)
        {
            // [SEMI-CLOSED] Change so that drawer is laid out semi-closed in
            // collapsed mode.
            childLeft = (width - childWidth) / 2;
            childTop = mExpanded ? mTopOffset : height - childHeight + mBottomOffset - mSemiClosedContentSize;

            content.layout(0, mTopOffset + childHeight, content.getMeasuredWidth(),
                            mTopOffset + childHeight + content.getMeasuredHeight());
        }
        else
        {
            // [SEMI-CLOSED] Change so that drawer is laid out semi-closed in
            // collapsed mode.
            childLeft = mExpanded ? mTopOffset : width - childWidth + mBottomOffset - mSemiClosedContentSize;
            childTop = (height - childHeight) / 2;

            content.layout(mTopOffset + childWidth, 0, mTopOffset + childWidth + content.getMeasuredWidth(),
                            content.getMeasuredHeight());
        }

        handle.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
        mHandleHeight = handle.getHeight();
        mHandleWidth = handle.getWidth();
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event)
    {
        if (mLocked)
        {
            return false;
        }

        final int action = event.getAction();

        float x = event.getX();
        float y = event.getY();

        final Rect frame = mFrame;
        final View handle = mHandle;

        handle.getHitRect(frame);

        if (!mTracking && !frame.contains((int) x, (int) y))
        {
            return false;
        }

        if (action == MotionEvent.ACTION_DOWN)
        {
            mTracking = true;

            handle.setPressed(true);
            // Must be called before prepareTracking()
            prepareContent();

            // Must be called after prepareContent()
            if (mOnDrawerScrollListener != null)
            {
                mOnDrawerScrollListener.onScrollStarted();
            }

            if (mVertical)
            {
                final int top = mHandle.getTop();
                mTouchDelta = (int) y - top;
                prepareTracking(top);
            }
            else
            {
                final int left = mHandle.getLeft();
                mTouchDelta = (int) x - left;
                prepareTracking(left);
            }
            mVelocityTracker.addMovement(event);
        }

        return true;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event)
    {
        if (mLocked)
        {
            return true;
        }

        if (mTracking)
        {
            mVelocityTracker.addMovement(event);
            final int action = event.getAction();
            switch (action) {
            case MotionEvent.ACTION_MOVE:
                moveHandle((int) (mVertical ? event.getY() : event.getX()) - mTouchDelta);
                break;
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL: {
                final VelocityTracker velocityTracker = mVelocityTracker;
                velocityTracker.computeCurrentVelocity(mVelocityUnits);

                float yVelocity = velocityTracker.getYVelocity();
                float xVelocity = velocityTracker.getXVelocity();
                boolean negative;

                final boolean vertical = mVertical;
                if (vertical)
                {
                    negative = yVelocity < 0;
                    if (xVelocity < 0)
                    {
                        xVelocity = -xVelocity;
                    }
                    if (xVelocity > mMaximumMinorVelocity)
                    {
                        xVelocity = mMaximumMinorVelocity;
                    }
                }
                else
                {
                    negative = xVelocity < 0;
                    if (yVelocity < 0)
                    {
                        yVelocity = -yVelocity;
                    }
                    if (yVelocity > mMaximumMinorVelocity)
                    {
                        yVelocity = mMaximumMinorVelocity;
                    }
                }

                float velocity = (float) Math.hypot(xVelocity, yVelocity);
                if (negative)
                {
                    velocity = -velocity;
                }

                final int top = mHandle.getTop();
                final int left = mHandle.getLeft();

                if (Math.abs(velocity) < mMaximumTapVelocity)
                {
                    // [SEMI-CLOSED] Remove width of visible content part here.
                    if (vertical ? (mExpanded && top < mTapThreshold + mTopOffset)
                                    || (!mExpanded && top > mBottomOffset + getBottom() - getTop() - mHandleHeight
                                                    - -mSemiClosedContentSize - mTapThreshold)
                                    : (mExpanded && left < mTapThreshold + mTopOffset)
                                                    || (!mExpanded && left > mBottomOffset + getRight() - getLeft()
                                                                    - mHandleWidth - mSemiClosedContentSize
                                                                    - mTapThreshold))
                    {

                        if (mAllowSingleTap)
                        {
                            playSoundEffect(SoundEffectConstants.CLICK);

                            if (mExpanded)
                            {
                                animateClose(vertical ? top : left);
                            }
                            else
                            {
                                animateOpen(vertical ? top : left);
                            }
                        }
                        else
                        {
                            performFling(vertical ? top : left, velocity, false);
                        }

                    }
                    else
                    {
                        performFling(vertical ? top : left, velocity, false);
                    }
                }
                else
                {
                    performFling(vertical ? top : left, velocity, false);
                }
            }
                break;
            }
        }

        return mTracking || mAnimating || super.onTouchEvent(event);
    }

    private void animateClose(int position)
    {
        prepareTracking(position);
        performFling(position, mMaximumAcceleration, true);
    }

    private void animateOpen(int position)
    {
        prepareTracking(position);
        performFling(position, -mMaximumAcceleration, true);
    }

    private void performFling(int position, float velocity, boolean always)
    {
        mAnimationPosition = position;
        mAnimatedVelocity = velocity;

        if (mExpanded)
        {
            if (always
                            || (velocity > mMaximumMajorVelocity || (position > mTopOffset
                                            + (mVertical ? mHandleHeight : mHandleWidth) && velocity > -mMaximumMajorVelocity)))
            {
                // We are expanded, but they didn't move sufficiently to cause
                // us to retract. Animate back to the expanded position.
                mAnimatedAcceleration = mMaximumAcceleration;
                if (velocity < 0)
                {
                    mAnimatedVelocity = 0;
                }
            }
            else
            {
                // We are expanded and are now going to animate away.
                mAnimatedAcceleration = -mMaximumAcceleration;
                if (velocity > 0)
                {
                    mAnimatedVelocity = 0;
                }
            }
        }
        else
        {
            if (!always
                            && (velocity > mMaximumMajorVelocity || (position > (mVertical ? getHeight() : getWidth()) / 2 && velocity > -mMaximumMajorVelocity)))
            {
                // We are collapsed, and they moved enough to allow us to
                // expand.
                mAnimatedAcceleration = mMaximumAcceleration;
                if (velocity < 0)
                {
                    mAnimatedVelocity = 0;
                }
            }
            else
            {
                // We are collapsed, but they didn't move sufficiently to cause
                // us to retract. Animate back to the collapsed position.
                mAnimatedAcceleration = -mMaximumAcceleration;
                if (velocity > 0)
                {
                    mAnimatedVelocity = 0;
                }
            }
        }

        long now = SystemClock.uptimeMillis();
        mAnimationLastTime = now;
        mCurrentAnimationTime = now + ANIMATION_FRAME_DURATION;
        mAnimating = true;
        mHandler.removeMessages(MSG_ANIMATE);
        mHandler.sendMessageAtTime(mHandler.obtainMessage(MSG_ANIMATE), mCurrentAnimationTime);
        stopTracking();
    }

    private void prepareTracking(int position)
    {
        mTracking = true;
        mVelocityTracker = VelocityTracker.obtain();
        boolean opening = !mExpanded;
        if (opening)
        {
            mAnimatedAcceleration = mMaximumAcceleration;
            mAnimatedVelocity = mMaximumMajorVelocity;
            // [SEMI-CLOSED] Remove width of visible content part here.
            mAnimationPosition = mBottomOffset + (mVertical ? getHeight() - mHandleHeight : getWidth() - mHandleWidth)
                            - mSemiClosedContentSize;
            moveHandle((int) mAnimationPosition);
            mAnimating = true;
            mHandler.removeMessages(MSG_ANIMATE);
            long now = SystemClock.uptimeMillis();
            mAnimationLastTime = now;
            mCurrentAnimationTime = now + ANIMATION_FRAME_DURATION;
            mAnimating = true;
        }
        else
        {
            if (mAnimating)
            {
                mAnimating = false;
                mHandler.removeMessages(MSG_ANIMATE);
            }
            moveHandle(position);
        }
    }

    private void moveHandle(int position)
    {
        final View handle = mHandle;

        if (mVertical)
        {
            if (position == EXPANDED_FULL_OPEN)
            {
                handle.offsetTopAndBottom(mTopOffset - handle.getTop());
                invalidate();
            }
            // [SEMI-CLOSED] Remove width of visible content part here.
            else if (position == COLLAPSED_SEMI_CLOSED)
            {
                handle.offsetTopAndBottom(mBottomOffset + getBottom() - getTop() - mHandleHeight
                                - mSemiClosedContentSize - handle.getTop());
                invalidate();
            }
            else
            {
                final int top = handle.getTop();
                int deltaY = position - top;
                if (position < mTopOffset)
                {
                    deltaY = mTopOffset - top;
                }
                // [SEMI-CLOSED] Remove width of visible content part here ...
                else if (deltaY > mBottomOffset + getBottom() - getTop() - mHandleHeight - mSemiClosedContentSize - top)
                {
                    // [SEMI_CLOSED] ... and here.
                    deltaY = mBottomOffset + getBottom() - getTop() - mHandleHeight - mSemiClosedContentSize - top;
                }
                handle.offsetTopAndBottom(deltaY);

                final Rect frame = mFrame;
                final Rect region = mInvalidate;

                handle.getHitRect(frame);
                region.set(frame);

                region.union(frame.left, frame.top - deltaY, frame.right, frame.bottom - deltaY);
                region.union(0, frame.bottom - deltaY, getWidth(), frame.bottom - deltaY + mContent.getHeight());

                invalidate(region);
            }
        }
        else
        {
            if (position == EXPANDED_FULL_OPEN)
            {
                handle.offsetLeftAndRight(mTopOffset - handle.getLeft());
                invalidate();
            }
            // [SEMI-CLOSED] Remove width of visible content part here.
            else if (position == COLLAPSED_SEMI_CLOSED)
            {
                handle.offsetLeftAndRight(mBottomOffset + getRight() - getLeft() - mHandleWidth
                                - mSemiClosedContentSize - handle.getLeft());
                invalidate();
            }
            else
            {
                final int left = handle.getLeft();
                int deltaX = position - left;
                if (position < mTopOffset)
                {
                    deltaX = mTopOffset - left;
                }
                // [SEMI-CLOSED] Remove width of visible content part here ...
                else if (deltaX > mBottomOffset + getRight() - getLeft() - mHandleWidth - mSemiClosedContentSize - left)
                {
                    // [SEMI-CLOSED] ... and here.
                    deltaX = mBottomOffset + getRight() - getLeft() - mHandleWidth - mSemiClosedContentSize - left;
                }
                handle.offsetLeftAndRight(deltaX);

                final Rect frame = mFrame;
                final Rect region = mInvalidate;

                handle.getHitRect(frame);
                region.set(frame);

                region.union(frame.left - deltaX, frame.top, frame.right - deltaX, frame.bottom);
                region.union(frame.right - deltaX, 0, frame.right - deltaX + mContent.getWidth(), getHeight());

                invalidate(region);
            }
        }
    }

    private void prepareContent()
    {
        if (mAnimating)
        {
            return;
        }

        // Something changed in the content, we need to honor the layout request
        // before creating the cached bitmap
        final View content = mContent;
        if (content.isLayoutRequested())
        {
            if (mVertical)
            {
                final int childHeight = mHandleHeight;
                int height = getBottom() - getTop() - childHeight - mTopOffset;
                content.measure(MeasureSpec.makeMeasureSpec(getRight() - getLeft(), MeasureSpec.EXACTLY),
                                MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
                content.layout(0, mTopOffset + childHeight, content.getMeasuredWidth(), mTopOffset + childHeight
                                + content.getMeasuredHeight());
            }
            else
            {
                final int childWidth = mHandle.getWidth();
                int width = getRight() - getLeft() - childWidth - mTopOffset;
                content.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
                                MeasureSpec.makeMeasureSpec(getBottom() - getTop(), MeasureSpec.EXACTLY));
                content.layout(childWidth + mTopOffset, 0, mTopOffset + childWidth + content.getMeasuredWidth(),
                                content.getMeasuredHeight());
            }
        }
        // Try only once... we should really loop but it's not a big deal
        // if the draw was cancelled, it will only be temporary anyway
        content.getViewTreeObserver().dispatchOnPreDraw();
        if (!isViewHardwareAccelerated(content))
        {
            content.buildDrawingCache();
        }

        content.setVisibility(View.GONE);
    }

    private boolean isViewHardwareAccelerated(View view)
    {
        // View.isHardwareAccelerated() is available from API level 11 (and up).
        try
        {
            Method isHardwareAcceleratedMethod = view.getClass().getDeclaredMethod("isHardwareAccelerated");
            if (isHardwareAcceleratedMethod != null)
            {
                Boolean result = (Boolean) isHardwareAcceleratedMethod.invoke(view);
                return result != null && result;
            }
        }
        catch (Exception e)
        {
            // Can't do anything here.
        }
        return false;
    }

    private void stopTracking()
    {
        mHandle.setPressed(false);
        mTracking = false;

        if (mOnDrawerScrollListener != null)
        {
            mOnDrawerScrollListener.onScrollEnded();
        }

        if (mVelocityTracker != null)
        {
            mVelocityTracker.recycle();
            mVelocityTracker = null;
        }
    }

    private void doAnimation()
    {
        if (mAnimating)
        {
            incrementAnimation();
            if (mAnimationPosition >= mBottomOffset + (mVertical ? getHeight() : getWidth()) - 1)
            {
                mAnimating = false;
                closeDrawer();
            }
            else if (mAnimationPosition < mTopOffset)
            {
                mAnimating = false;
                openDrawer();
            }
            else
            {
                moveHandle((int) mAnimationPosition);
                mCurrentAnimationTime += ANIMATION_FRAME_DURATION;
                mHandler.sendMessageAtTime(mHandler.obtainMessage(MSG_ANIMATE), mCurrentAnimationTime);
            }
        }
    }

    private void incrementAnimation()
    {
        long now = SystemClock.uptimeMillis();
        float t = (now - mAnimationLastTime) / 1000.0f; // ms -> s
        final float position = mAnimationPosition;
        final float v = mAnimatedVelocity; // px/s
        final float a = mAnimatedAcceleration; // px/s/s
        mAnimationPosition = position + (v * t) + (0.5f * a * t * t); // px
        mAnimatedVelocity = v + (a * t); // px/s
        mAnimationLastTime = now; // ms
    }

    /**
     * Toggles the drawer open and close. Takes effect immediately.
     *
     * @see #open()
     * @see #close()
     * @see #animateClose()
     * @see #animateOpen()
     * @see #animateToggle()
     */
    public void toggle()
    {
        if (!mExpanded)
        {
            openDrawer();
        }
        else
        {
            closeDrawer();
        }
        invalidate();
        requestLayout();
    }

    /**
     * Toggles the drawer open and close with an animation.
     *
     * @see #open()
     * @see #close()
     * @see #animateClose()
     * @see #animateOpen()
     * @see #toggle()
     */
    public void animateToggle()
    {
        if (!mExpanded)
        {
            animateOpen();
        }
        else
        {
            animateClose();
        }
    }

    /**
     * Opens the drawer immediately.
     *
     * @see #toggle()
     * @see #close()
     * @see #animateOpen()
     */
    public void open()
    {
        openDrawer();
        invalidate();
        requestLayout();

        sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
    }

    /**
     * Closes the drawer immediately.
     *
     * @see #toggle()
     * @see #open()
     * @see #animateClose()
     */
    public void close()
    {
        closeDrawer();
        invalidate();
        requestLayout();
    }

    /**
     * Closes the drawer with an animation.
     *
     * @see #close()
     * @see #open()
     * @see #animateOpen()
     * @see #animateToggle()
     * @see #toggle()
     */
    public void animateClose()
    {
        prepareContent();
        final OnDrawerScrollListener scrollListener = mOnDrawerScrollListener;
        if (scrollListener != null)
        {
            scrollListener.onScrollStarted();
        }
        animateClose(mVertical ? mHandle.getTop() : mHandle.getLeft());

        if (scrollListener != null)
        {
            scrollListener.onScrollEnded();
        }
    }

    /**
     * Opens the drawer with an animation.
     *
     * @see #close()
     * @see #open()
     * @see #animateClose()
     * @see #animateToggle()
     * @see #toggle()
     */
    public void animateOpen()
    {
        prepareContent();
        final OnDrawerScrollListener scrollListener = mOnDrawerScrollListener;
        if (scrollListener != null)
        {
            scrollListener.onScrollStarted();
        }
        animateOpen(mVertical ? mHandle.getTop() : mHandle.getLeft());

        sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);

        if (scrollListener != null)
        {
            scrollListener.onScrollEnded();
        }
    }

    private void closeDrawer()
    {
        moveHandle(COLLAPSED_SEMI_CLOSED);
        mContent.setVisibility(View.GONE);
        mContent.destroyDrawingCache();

        if (!mExpanded)
        {
            return;
        }

        mExpanded = false;
        if (mOnDrawerCloseListener != null)
        {
            mOnDrawerCloseListener.onDrawerClosed();
        }
    }

    private void openDrawer()
    {
        moveHandle(EXPANDED_FULL_OPEN);
        mContent.setVisibility(View.VISIBLE);

        if (mExpanded)
        {
            return;
        }

        mExpanded = true;

        if (mOnDrawerOpenListener != null)
        {
            mOnDrawerOpenListener.onDrawerOpened();
        }
    }

    /**
     * Sets the listener that receives a notification when the drawer becomes
     * open.
     *
     * @param onDrawerOpenListener
     *            The listener to be notified when the drawer is opened.
     */
    public void setOnDrawerOpenListener(OnDrawerOpenListener onDrawerOpenListener)
    {
        mOnDrawerOpenListener = onDrawerOpenListener;
    }

    /**
     * Sets the listener that receives a notification when the drawer becomes
     * close.
     *
     * @param onDrawerCloseListener
     *            The listener to be notified when the drawer is closed.
     */
    public void setOnDrawerCloseListener(OnDrawerCloseListener onDrawerCloseListener)
    {
        mOnDrawerCloseListener = onDrawerCloseListener;
    }

    /**
     * Sets the listener that receives a notification when the drawer starts or
     * ends a scroll. A fling is considered as a scroll. A fling will also
     * trigger a drawer opened or drawer closed event.
     *
     * @param onDrawerScrollListener
     *            The listener to be notified when scrolling starts or stops.
     */
    public void setOnDrawerScrollListener(OnDrawerScrollListener onDrawerScrollListener)
    {
        mOnDrawerScrollListener = onDrawerScrollListener;
    }

    /**
     * Returns the handle of the drawer.
     *
     * @return The View reprenseting the handle of the drawer, identified by the
     *         "handle" id in XML.
     */
    public View getHandle()
    {
        return mHandle;
    }

    /**
     * Returns the content of the drawer.
     *
     * @return The View reprenseting the content of the drawer, identified by
     *         the "content" id in XML.
     */
    public View getContent()
    {
        return mContent;
    }

    /**
     * Unlocks the SlidingDrawer so that touch events are processed.
     *
     * @see #lock()
     */
    public void unlock()
    {
        mLocked = false;
    }

    /**
     * Locks the SlidingDrawer so that touch events are ignores.
     *
     * @see #unlock()
     */
    public void lock()
    {
        mLocked = true;
    }

    /**
     * Indicates whether the drawer is currently fully opened.
     *
     * @return True if the drawer is opened, false otherwise.
     */
    public boolean isOpened()
    {
        return mExpanded;
    }

    /**
     * Indicates whether the drawer is scrolling or flinging.
     *
     * @return True if the drawer is scroller or flinging, false otherwise.
     */
    public boolean isMoving()
    {
        return mTracking || mAnimating;
    }

    private class DrawerToggler
        implements OnClickListener
    {
        public void onClick(View v)
        {
            if (mLocked)
            {
                return;
            }
            // mAllowSingleTap isn't relevant here; you're *always*
            // allowed to open/close the drawer by clicking with the
            // trackball.

            if (mAnimateOnClick)
            {
                animateToggle();
            }
            else
            {
                toggle();
            }
        }
    }

    private class SlidingHandler
        extends Handler
    {
        public void handleMessage(Message m)
        {
            switch (m.what) {
            case MSG_ANIMATE:
                doAnimation();
                break;
            }
        }
    }
}