学步园

1. 引言

    在Android中，对SlidingDraw组件进行修改，将SlidingDraw组件的把手（手柄）改成左右两个Button，单击或拖动第一个Button响应SlidingDraw所有默认动作，第二个Button也随第一个Button动而动，单击第二个Button,可以启动一个Activity或弹出Dialog,第二个Button不响应SlidingDraw的任何默认动作。

2. 效果图：

    (1) 效果图１：

    (2) 效果图2:

3. 功能实现

    (1) 主布局(main.xml)实现：<?xml version="1.0" encoding="utf-8"?><br /> <LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"<br /> xmlns:flyfot = "http://schemas.android.com/apk/res/com.focus.fishme"<br /> android:layout_width = "fill_parent"<br /> android:layout_height = "fill_parent"<br /> ><br /> <com.focus.fishme.FishMeSlidingDrawer<br /> android:id = "@+id/slidingDrawer"<br /> android:layout_width = "fill_parent"<br /> android:layout_height = "fill_parent"<br /> flyfot:handle = "@+id/dragger"<br /> flyfot:content = "@+id/content"<br /> ></p> <p> <LinearLayout<br /> android:id = "@+id/dragger"<br /> android:layout_width = "wrap_content"<br /> android:layout_height = "wrap_content"<br /> ><br /> <Button<br /> android:id = "@+id/mainButton"<br /> android:layout_width = "wrap_content"<br /> android:layout_height = "wrap_content"<br /> android:text = "DRAWER1"<br /> android:clickable = "false"<br /> /></p> <p> <Button<br /> android:id = "@+id/phoneButton"<br /> android:layout_width = "wrap_content"<br /> android:layout_height = "wrap_content"<br /> android:text = "DRAWER2"<br /> /><br /> </LinearLayout></p> <p> <LinearLayout<br /> android:id = "@+id/content"<br /> android:layout_width = "fill_parent"<br /> android:layout_height = "fill_parent"<br /> android:background = "#00FF00"></p> <p> </LinearLayout> </p> <p> </com.focus.fishme.FishMeSlidingDrawer></p> <p></LinearLayout><br />

    (1) 主Activity实现：package com.focus.fishme;<br /> import com.focus.fishme.FishMeSlidingDrawer.OnDrawerCloseListener;<br /> import com.focus.fishme.FishMeSlidingDrawer.OnDrawerOpenListener;<br /> import android.app.Activity;<br /> import android.os.Bundle;<br /> import android.view.Window;<br /> public class SlidingDrawerActivity extends Activity {</p> <p> private FishMeSlidingDrawer slidingDrawer;</p> <p> @Override<br /> public void onCreate(Bundle savedInstanceState) {<br /> super.onCreate(savedInstanceState);<br /> requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);<br /> setProgressBarIndeterminateVisibility(true);</p> <p> setContentView(R.layout.main);</p> <p> slidingDrawer = (FishMeSlidingDrawer) findViewById(R.id.slidingDrawer);</p> <p> slidingDrawer.setOnDrawerOpenListener(new OnDrawerOpenListener() {</p> <p> public void onDrawerOpened() {</p> <p> }<br /> });</p> <p> slidingDrawer.setOnDrawerCloseListener(new OnDrawerCloseListener() {<br /> public void onDrawerClosed() {</p> <p> }</p> <p> });<br /> }<br /> }
 

    (2) SlidingDraw修改实现：package com.focus.fishme;</p> <p>import android.content.Context;<br /> import android.content.res.TypedArray;<br /> import android.graphics.Bitmap;<br /> import android.graphics.Canvas;<br /> import android.graphics.Rect;<br /> import android.os.Handler;<br /> import android.os.Message;<br /> import android.os.SystemClock;<br /> import android.util.AttributeSet;<br /> import android.view.MotionEvent;<br /> import android.view.SoundEffectConstants;<br /> import android.view.VelocityTracker;<br /> import android.view.View;<br /> import android.view.ViewGroup;<br /> import android.view.accessibility.AccessibilityEvent;<br /> import android.widget.Button;</p> <p>public class FishMeSlidingDrawer extends ViewGroup {<br /> public static final int ORIENTATION_HORIZONTAL = 0;<br /> public static final int ORIENTATION_VERTICAL = 1;</p> <p> private static final int TAP_THRESHOLD = 6;<br /> private static final float MAXIMUM_TAP_VELOCITY = 100.0f;<br /> private static final float MAXIMUM_MINOR_VELOCITY = 150.0f;<br /> private static final float MAXIMUM_MAJOR_VELOCITY = 200.0f;<br /> private static final float MAXIMUM_ACCELERATION = 2000.0f;<br /> private static final int VELOCITY_UNITS = 1000;<br /> private static final int MSG_ANIMATE = 1000;<br /> private static final int ANIMATION_FRAME_DURATION = 1000 / 60;</p> <p> private static final int EXPANDED_FULL_OPEN = -10001;<br /> private static final int COLLAPSED_FULL_CLOSED = -10002;</p> <p> private final int mHandleId;<br /> private final int mContentId;</p> <p> private View mHandle;<br /> private View mContent;</p> <p> private final Rect mFrame = new Rect();<br /> private final Rect mInvalidate = new Rect();<br /> private boolean mTracking;<br /> private boolean mLocked;</p> <p> private VelocityTracker mVelocityTracker;</p> <p> private boolean mVertical;<br /> private boolean mExpanded;<br /> private int mBottomOffset;<br /> private int mTopOffset;<br /> private int mHandleHeight;<br /> private int mHandleWidth;</p> <p> private OnDrawerOpenListener mOnDrawerOpenListener;<br /> private OnDrawerCloseListener mOnDrawerCloseListener;<br /> private OnDrawerScrollListener mOnDrawerScrollListener;</p> <p> private final Handler mHandler = new SlidingHandler();<br /> private float mAnimatedAcceleration;<br /> private float mAnimatedVelocity;<br /> private float mAnimationPosition;<br /> private long mAnimationLastTime;<br /> private long mCurrentAnimationTime;<br /> private int mTouchDelta;<br /> private boolean mAnimating;<br /> private boolean mAllowSingleTap;<br /> private boolean mAnimateOnClick;</p> <p> private final int mTapThreshold;<br /> private final int mMaximumTapVelocity;<br /> private final int mMaximumMinorVelocity;<br /> private final int mMaximumMajorVelocity;<br /> private final int mMaximumAcceleration;<br /> private final int mVelocityUnits;</p> <p> /**<br /> * Callback invoked when the drawer is opened.<br /> */<br /> public static interface OnDrawerOpenListener {<br /> /**<br /> * Invoked when the drawer becomes fully open.<br /> */<br /> public void onDrawerOpened();<br /> }</p> <p> /**<br /> * Callback invoked when the drawer is closed.<br /> */<br /> public static interface OnDrawerCloseListener {<br /> /**<br /> * Invoked when the drawer becomes fully closed.<br /> */<br /> public void onDrawerClosed();<br /> }</p> <p> /**<br /> * Callback invoked when the drawer is scrolled.<br /> */<br /> public static interface OnDrawerScrollListener {<br /> /**<br /> * Invoked when the user starts dragging/flinging the drawer's handle.<br /> */<br /> public void onScrollStarted();</p> <p> /**<br /> * Invoked when the user stops dragging/flinging the drawer's handle.<br /> */<br /> public void onScrollEnded();<br /> }</p> <p> /**<br /> * Creates a new SlidingDrawer from a specified set of attributes defined in XML.<br /> *<br /> * @param context The application's environment.<br /> * @param attrs The attributes defined in XML.<br /> */<br /> public FishMeSlidingDrawer(Context context, AttributeSet attrs) {<br /> this(context, attrs, 0);<br /> }</p> <p> /**<br /> * Creates a new SlidingDrawer from a specified set of attributes defined in XML.<br /> *<br /> * @param context The application's environment.<br /> * @param attrs The attributes defined in XML.<br /> * @param defStyle The style to apply to this widget.<br /> */<br /> public FishMeSlidingDrawer(Context context, AttributeSet attrs, int defStyle) {<br /> super(context, attrs, defStyle);<br /> TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FlyFotSlidingDrawer, defStyle, 0);</p> <p> int orientation = a.getInt(R.styleable.FlyFotSlidingDrawer_orientation, ORIENTATION_VERTICAL);<br /> mVertical = orientation == ORIENTATION_VERTICAL;<br /> mBottomOffset = (int) a.getDimension(R.styleable.FlyFotSlidingDrawer_bottomOffset, 0.0f);<br /> mTopOffset = (int) a.getDimension(R.styleable.FlyFotSlidingDrawer_topOffset, 0.0f);<br /> mAllowSingleTap = a.getBoolean(R.styleable.FlyFotSlidingDrawer_allowSingleTap, true);<br /> mAnimateOnClick = a.getBoolean(R.styleable.FlyFotSlidingDrawer_animateOnClick, true);</p> <p> int handleId = a.getResourceId(R.styleable.FlyFotSlidingDrawer_handle, 0);<br /> if (handleId == 0) {<br /> throw new IllegalArgumentException("The handle attribute is required and must refer "<br /> + "to a valid child.");<br /> }</p> <p> int contentId = a.getResourceId(R.styleable.FlyFotSlidingDrawer_content, 0);<br /> if (contentId == 0) {<br /> throw new IllegalArgumentException("The content attribute is required and must refer "<br /> + "to a valid child.");<br /> }</p> <p> if (handleId == contentId) {<br /> throw new IllegalArgumentException("The content and handle attributes must refer "<br /> + "to different children.");<br /> }</p> <p> mHandleId = handleId;<br /> mContentId = contentId;</p> <p> final float density = getResources().getDisplayMetrics().density;<br /> mTapThreshold = (int) (TAP_THRESHOLD * density + 0.5f);<br /> mMaximumTapVelocity = (int) (MAXIMUM_TAP_VELOCITY * density + 0.5f);<br /> mMaximumMinorVelocity = (int) (MAXIMUM_MINOR_VELOCITY * density + 0.5f);<br /> mMaximumMajorVelocity = (int) (MAXIMUM_MAJOR_VELOCITY * density + 0.5f);<br /> mMaximumAcceleration = (int) (MAXIMUM_ACCELERATION * density + 0.5f);<br /> mVelocityUnits = (int) (VELOCITY_UNITS * density + 0.5f);</p> <p> a.recycle();</p> <p> setAlwaysDrawnWithCacheEnabled(false);<br /> }</p> <p> @Override<br /> protected void onFinishInflate() {<br /> mHandle = findViewById(mHandleId);<br /> if (mHandle == null) {<br /> throw new IllegalArgumentException("The handle attribute is must refer to an"<br /> + " existing child.");<br /> }<br /> mHandle.setOnClickListener(new DrawerToggler());</p> <p> mContent = findViewById(mContentId);<br /> if (mContent == null) {<br /> throw new IllegalArgumentException("The content attribute is must refer to an"<br /> + " existing child.");<br /> }<br /> mContent.setVisibility(View.GONE);<br /> }</p> <p> @Override<br /> protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {<br /> int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);<br /> int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);</p> <p> int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);<br /> int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);</p> <p> if (widthSpecMode == MeasureSpec.UNSPECIFIED || heightSpecMode == MeasureSpec.UNSPECIFIED) {<br /> throw new RuntimeException("SlidingDrawer cannot have UNSPECIFIED dimensions");<br /> }</p> <p> final View handle = mHandle;<br /> measureChild(handle, widthMeasureSpec, heightMeasureSpec);</p> <p> if (mVertical) {<br /> int height = heightSpecSize - handle.getMeasuredHeight() - mTopOffset;<br /> mContent.measure(MeasureSpec.makeMeasureSpec(widthSpecSize, MeasureSpec.EXACTLY),<br /> MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));<br /> } else {<br /> int width = widthSpecSize - handle.getMeasuredWidth() - mTopOffset;<br /> mContent.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),<br /> MeasureSpec.makeMeasureSpec(heightSpecSize, MeasureSpec.EXACTLY));<br /> }</p> <p> setMeasuredDimension(widthSpecSize, heightSpecSize);<br /> }</p> <p> @Override<br /> protected void dispatchDraw(Canvas canvas) {<br /> final long drawingTime = getDrawingTime();<br /> final View handle = mHandle;<br /> final boolean isVertical = mVertical;</p> <p> drawChild(canvas, handle, drawingTime);</p> <p> if (mTracking || mAnimating) {<br /> final Bitmap cache = mContent.getDrawingCache();<br /> if (cache != null) {<br /> if (isVertical) {<br /> canvas.drawBitmap(cache, 0, handle.getBottom(), null);<br /> } else {<br /> canvas.drawBitmap(cache, handle.getRight(), 0, null);<br /> }<br /> } else {<br /> canvas.save();<br /> canvas.translate(isVertical ? 0 : handle.getLeft() - mTopOffset,<br /> isVertical ? handle.getTop() - mTopOffset : 0);<br /> drawChild(canvas, mContent, drawingTime);<br /> canvas.restore();<br /> }<br /> } else if (mExpanded) {<br /> drawChild(canvas, mContent, drawingTime);<br /> }<br /> }</p> <p> @Override<br /> protected void onLayout(boolean changed, int l, int t, int r, int b) {<br /> if (mTracking) {<br /> return;<br /> }</p> <p> final int width = r - l;<br /> final int height = b - t;</p> <p> final View handle = mHandle;</p> <p> int childWidth = handle.getMeasuredWidth();<br /> int childHeight = handle.getMeasuredHeight();</p> <p> int childLeft;<br /> int childTop;</p> <p> final View content = mContent;</p> <p> if (mVertical) {<br /> childLeft = (width - childWidth) / 2;<br /> childTop = mExpanded ? mTopOffset : height - childHeight + mBottomOffset;</p> <p> content.layout(0, mTopOffset + childHeight, content.getMeasuredWidth(),<br /> mTopOffset + childHeight + content.getMeasuredHeight());<br /> } else {<br /> childLeft = mExpanded ? mTopOffset : width - childWidth + mBottomOffset;<br /> childTop = (height - childHeight) / 2;</p> <p> content.layout(mTopOffset + childWidth, 0,<br /> mTopOffset + childWidth + content.getMeasuredWidth(),<br /> content.getMeasuredHeight());<br /> }</p> <p> handle.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);<br /> mHandleHeight = handle.getHeight();<br /> mHandleWidth = handle.getWidth();<br /> }</p> <p> @Override<br /> public boolean onInterceptTouchEvent(MotionEvent event) {<br /> if (mLocked) {<br /> return false;<br /> }</p> <p> final int action = event.getAction();</p> <p> float x = event.getX();<br /> float y = event.getY();</p> <p> final Rect frame = mFrame;<br /> final View handle = mHandle;</p> <p> //TODO<br /> Button mainButton = (Button) findViewById(R.id.mainButton);</p> <p> handle.getHitRect(frame);</p> <p> //TODO<br /> frame.right = frame.right / 2 + 30;</p> <p> if (!mTracking && !frame.contains((int) x, (int) y)) {<br /> return false;<br /> }</p> <p> if (action == MotionEvent.ACTION_DOWN) {<br /> mTracking = true;</p> <p> //TODO<br /> mainButton.setPressed(true);</p> <p> // Must be called before prepareTracking()<br /> prepareContent();</p> <p> // Must be called after prepareContent()<br /> if (mOnDrawerScrollListener != null) {<br /> mOnDrawerScrollListener.onScrollStarted();<br /> }</p> <p> if (mVertical) {<br /> final int top = mHandle.getTop();<br /> mTouchDelta = (int) y - top;<br /> prepareTracking(top);<br /> } else {<br /> final int left = mHandle.getLeft();<br /> mTouchDelta = (int) x - left;<br /> prepareTracking(left);<br /> }<br /> mVelocityTracker.addMovement(event);<br /> }</p> <p> return true;<br /> }</p> <p> @Override<br /> public boolean onTouchEvent(MotionEvent event) {<br /> if (mLocked) {<br /> return true;<br /> }</p> <p> if (mTracking) {<br /> mVelocityTracker.addMovement(event);<br /> final int action = event.getAction();<br /> switch (action) {<br /> case MotionEvent.ACTION_MOVE:<br /> moveHandle((int) (mVertical ? event.getY() : event.getX()) - mTouchDelta);<br /> break;<br /> case MotionEvent.ACTION_UP:<br /> case MotionEvent.ACTION_CANCEL: {<br /> final VelocityTracker velocityTracker = mVelocityTracker;<br /> velocityTracker.computeCurrentVelocity(mVelocityUnits);</p> <p> float yVelocity = velocityTracker.getYVelocity();<br /> float xVelocity = velocityTracker.getXVelocity();<br /> boolean negative;</p> <p> final boolean vertical = mVertical;<br /> if (vertical) {<br /> negative = yVelocity < 0;<br /> if (xVelocity < 0) {<br /> xVelocity = -xVelocity;<br /> }<br /> if (xVelocity > mMaximumMinorVelocity) {<br /> xVelocity = mMaximumMinorVelocity;<br /> }<br /> } else {<br /> negative = xVelocity < 0;<br /> if (yVelocity < 0) {<br /> yVelocity = -yVelocity;<br /> }<br /> if (yVelocity > mMaximumMinorVelocity) {<br /> yVelocity = mMaximumMinorVelocity;<br /> }<br /> }</p> <p> float velocity = (float) Math.hypot(xVelocity, yVelocity);<br /> if (negative) {<br /> velocity = -velocity;<br /> }</p> <p> final int top = mHandle.getTop();<br /> final int left = mHandle.getLeft();</p> <p> if (Math.abs(velocity) < mMaximumTapVelocity) {<br /> if (vertical ? (mExpanded && top < mTapThreshold + mTopOffset) ||<br /> (!mExpanded && top > mBottomOffset + getBottom() - getTop() -<br /> mHandleHeight - mTapThreshold) :<br /> (mExpanded && left < mTapThreshold + mTopOffset) ||<br /> (!mExpanded && left > mBottomOffset + getRight() - getLeft() -<br /> mHandleWidth - mTapThreshold)) {</p> <p> if (mAllowSingleTap) {<br /> playSoundEffect(SoundEffectConstants.CLICK);</p> <p> if (mExpanded) {<br /> animateClose(vertical ? top : left);<br /> } else {<br /> animateOpen(vertical ? top : left);<br /> }<br /> } else {<br /> performFling(vertical ? top : left, velocity, false);<br /> }</p> <p> } else {<br /> performFling(vertical ? top : left, velocity, false);<br /> }<br /> } else {<br /> performFling(vertical ? top : left, velocity, false);<br /> }<br /> }<br /> break;<br /> }<br /> }</p> <p> return mTracking || mAnimating || super.onTouchEvent(event);<br /> }</p> <p> private void animateClose(int position) {<br /> prepareTracking(position);<br /> performFling(position, mMaximumAcceleration, true);<br /> }</p> <p> private void animateOpen(int position) {<br /> prepareTracking(position);<br /> performFling(position, -mMaximumAcceleration, true);<br /> }</p> <p> private void performFling(int position, float velocity, boolean always) {<br /> mAnimationPosition = position;<br /> mAnimatedVelocity = velocity;</p> <p> if (mExpanded) {<br /> if (always || (velocity > mMaximumMajorVelocity ||<br /> (position > mTopOffset + (mVertical ? mHandleHeight : mHandleWidth) &&<br /> velocity > -mMaximumMajorVelocity))) {<br /> // We are expanded, but they didn't move sufficiently to cause<br /> // us to retract. Animate back to the expanded position.<br /> mAnimatedAcceleration = mMaximumAcceleration;<br /> if (velocity < 0) {<br /> mAnimatedVelocity = 0;<br /> }<br /> } else {<br /> // We are expanded and are now going to animate away.<br /> mAnimatedAcceleration = -mMaximumAcceleration;<br /> if (velocity > 0) {<br /> mAnimatedVelocity = 0;<br /> }<br /> }<br /> } else {<br /> if (!always && (velocity > mMaximumMajorVelocity ||<br /> (position > (mVertical ? getHeight() : getWidth()) / 2 &&<br /> velocity > -mMaximumMajorVelocity))) {<br /> // We are collapsed, and they moved enough to allow us to expand.<br /> mAnimatedAcceleration = mMaximumAcceleration;<br /> if (velocity < 0) {<br /> mAnimatedVelocity = 0;<br /> }<br /> } else {<br /> // We are collapsed, but they didn't move sufficiently to cause<br /> // us to retract. Animate back to the collapsed position.<br /> mAnimatedAcceleration = -mMaximumAcceleration;<br /> if (velocity > 0) {<br /> mAnimatedVelocity = 0;<br /> }<br /> }<br /> }</p> <p> long now = SystemClock.uptimeMillis();<br /> mAnimationLastTime = now;<br /> mCurrentAnimationTime = now + ANIMATION_FRAME_DURATION;<br /> mAnimating = true;<br /> mHandler.removeMessages(MSG_ANIMATE);<br /> mHandler.sendMessageAtTime(mHandler.obtainMessage(MSG_ANIMATE), mCurrentAnimationTime);<br /> stopTracking();<br /> }</p> <p> private void prepareTracking(int position) {<br /> mTracking = true;<br /> mVelocityTracker = VelocityTracker.obtain();<br /> boolean opening = !mExpanded;<br /> if (opening) {<br /> mAnimatedAcceleration = mMaximumAcceleration;<br /> mAnimatedVelocity = mMaximumMajorVelocity;<br /> mAnimationPosition = mBottomOffset +<br /> (mVertical ? getHeight() - mHandleHeight : getWidth() - mHandleWidth);<br /> moveHandle((int) mAnimationPosition);<br /> mAnimating = true;<br /> mHandler.removeMessages(MSG_ANIMATE);<br /> long now = SystemClock.uptimeMillis();<br /> mAnimationLastTime = now;<br /> mCurrentAnimationTime = now + ANIMATION_FRAME_DURATION;<br /> mAnimating = true;<br /> } else {<br /> if (mAnimating) {<br /> mAnimating = false;<br /> mHandler.removeMessages(MSG_ANIMATE);<br /> }<br /> moveHandle(position);<br /> }<br /> }</p> <p> private void moveHandle(int position) {<br /> final View handle = mHandle;</p> <p> if (mVertical) {<br /> if (position == EXPANDED_FULL_OPEN) {<br /> handle.offsetTopAndBottom(mTopOffset - handle.getTop());<br /> invalidate();<br /> } else if (position == COLLAPSED_FULL_CLOSED) {<br /> handle.offsetTopAndBottom(mBottomOffset + getBottom() - getTop() -<br /> mHandleHeight - handle.getTop());<br /> invalidate();<br /> } else {<br /> final int top = handle.getTop();<br /> int deltaY = position - top;<br /> if (position < mTopOffset) {<br /> deltaY = mTopOffset - top;<br /> } else if (deltaY > mBottomOffset + getBottom() - getTop() - mHandleHeight - top) {<br /> deltaY = mBottomOffset + getBottom() - getTop() - mHandleHeight - top;<br /> }<br /> handle.offsetTopAndBottom(deltaY);</p> <p> final Rect frame = mFrame;<br /> final Rect region = mInvalidate;</p> <p> handle.getHitRect(frame);<br /> region.set(frame);</p> <p> region.union(frame.left, frame.top - deltaY, frame.right, frame.bottom - deltaY);<br /> region.union(0, frame.bottom - deltaY, getWidth(),<br /> frame.bottom - deltaY + mContent.getHeight());</p> <p> invalidate(region);<br /> }<br /> } else {<br /> if (position == EXPANDED_FULL_OPEN) {<br /> handle.offsetLeftAndRight(mTopOffset - handle.getLeft());<br /> invalidate();<br /> } else if (position == COLLAPSED_FULL_CLOSED) {<br /> handle.offsetLeftAndRight(mBottomOffset + getRight() - getLeft() -<br /> mHandleWidth - handle.getLeft());<br /> invalidate();<br /> } else {<br /> final int left = handle.getLeft();<br /> int deltaX = position - left;<br /> if (position < mTopOffset) {<br /> deltaX = mTopOffset - left;<br /> } else if (deltaX > mBottomOffset + getRight() - getLeft() - mHandleWidth - left) {<br /> deltaX = mBottomOffset + getRight() - getLeft() - mHandleWidth - left;<br /> }<br /> handle.offsetLeftAndRight(deltaX);</p> <p> final Rect frame = mFrame;<br /> final Rect region = mInvalidate;</p> <p> handle.getHitRect(frame);<br /> region.set(frame);</p> <p> region.union(frame.left - deltaX, frame.top, frame.right - deltaX, frame.bottom);<br /> region.union(frame.right - deltaX, 0,<br /> frame.right - deltaX + mContent.getWidth(), getHeight());</p> <p> invalidate(region);<br /> }<br /> }<br /> }</p> <p> private void prepareContent() {<br /> if (mAnimating) {<br /> return;<br /> }</p> <p> // Something changed in the content, we need to honor the layout request<br /> // before creating the cached bitmap<br /> final View content = mContent;<br /> if (content.isLayoutRequested()) {<br /> if (mVertical) {<br /> final int childHeight = mHandleHeight;<br /> int height = getBottom() - getTop() - childHeight - mTopOffset;<br /> content.measure(MeasureSpec.makeMeasureSpec(getRight() - getLeft(), MeasureSpec.EXACTLY),<br /> MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));<br /> content.layout(0, mTopOffset + childHeight, content.getMeasuredWidth(),<br /> mTopOffset + childHeight + content.getMeasuredHeight());<br /> } else {<br /> final int childWidth = mHandle.getWidth();<br /> int width = getRight() - getLeft() - childWidth - mTopOffset;<br /> content.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),<br /> MeasureSpec.makeMeasureSpec(getBottom() - getTop(), MeasureSpec.EXACTLY));<br /> content.layout(childWidth + mTopOffset, 0,<br /> mTopOffset + childWidth + content.getMeasuredWidth(),<br /> content.getMeasuredHeight());<br /> }<br /> }<br /> // Try only once... we should really loop but it's not a big deal<br /> // if the draw was cancelled, it will only be temporary anyway<br /> content.getViewTreeObserver().dispatchOnPreDraw();<br /> content.buildDrawingCache();</p> <p> content.setVisibility(View.GONE);<br /> }</p> <p> private void stopTracking() {<br /> mHandle.setPressed(false);<br /> mTracking = false;</p> <p> if (mOnDrawerScrollListener != null) {<br /> mOnDrawerScrollListener.onScrollEnded();<br /> }</p> <p> if (mVelocityTracker != null) {<br /> mVelocityTracker.recycle();<br /> mVelocityTracker = null;<br /> }<br /> }</p> <p> private void doAnimation() {<br /> if (mAnimating) {<br /> incrementAnimation();<br /> if (mAnimationPosition >= mBottomOffset + (mVertical ? getHeight() : getWidth()) - 1) {<br /> mAnimating = false;<br /> closeDrawer();<br /> } else if (mAnimationPosition < mTopOffset) {<br /> mAnimating = false;<br /> openDrawer();<br /> } else {<br /> moveHandle((int) mAnimationPosition);<br /> mCurrentAnimationTime += ANIMATION_FRAME_DURATION;<br /> mHandler.sendMessageAtTime(mHandler.obtainMessage(MSG_ANIMATE),<br /> mCurrentAnimationTime);<br /> }<br /> }<br /> }</p> <p> private void incrementAnimation() {<br /> long now = SystemClock.uptimeMillis();<br /> float t = (now - mAnimationLastTime) / 1000.0f; // ms -> s<br /> final float position = mAnimationPosition;<br /> final float v = mAnimatedVelocity; // px/s<br /> final float a = mAnimatedAcceleration; // px/s/s<br /> mAnimationPosition = position + (v * t) + (0.5f * a * t * t); // px<br /> mAnimatedVelocity = v + (a * t); // px/s<br /> mAnimationLastTime = now; // ms<br /> }</p> <p> /**<br /> * Toggles the drawer open and close. Takes effect immediately.<br /> *<br /> * @see #open()<br /> * @see #close()<br /> * @see #animateClose()<br /> * @see #animateOpen()<br /> * @see #animateToggle()<br /> */<br /> public void toggle() {<br /> if (!mExpanded) {<br /> openDrawer();<br /> } else {<br /> closeDrawer();<br /> }<br /> invalidate();<br /> requestLayout();<br /> }</p> <p> /**<br /> * Toggles the drawer open and close with an animation.<br /> *<br /> * @see #open()<br /> * @see #close()<br /> * @see #animateClose()<br /> * @see #animateOpen()<br /> * @see #toggle()<br /> */<br /> public void animateToggle() {<br /> if (!mExpanded) {<br /> animateOpen();<br /> } else {<br /> animateClose();<br /> }<br /> }</p> <p> /**<br /> * Opens the drawer immediately.<br /> *<br /> * @see #toggle()<br /> * @see #close()<br /> * @see #animateOpen()<br /> */<br /> public void open() {<br /> openDrawer();<br /> invalidate();<br /> requestLayout();</p> <p> sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);<br /> }</p> <p> /**<br /> * Closes the drawer immediately.<br /> *<br /> * @see #toggle()<br /> * @see #open()<br /> * @see #animateClose()<br /> */<br /> public void close() {<br /> closeDrawer();<br /> invalidate();<br /> requestLayout();<br /> }</p> <p> /**<br /> * Closes the drawer with an animation.<br /> *<br /> * @see #close()<br /> * @see #open()<br /> * @see #animateOpen()<br /> * @see #animateToggle()<br /> * @see #toggle()<br /> */<br /> public void animateClose() {<br /> prepareContent();<br /> final OnDrawerScrollListener scrollListener = mOnDrawerScrollListener;<br /> if (scrollListener != null) {<br /> scrollListener.onScrollStarted();<br /> }<br /> animateClose(mVertical ? mHandle.getTop() : mHandle.getLeft());</p> <p> if (scrollListener != null) {<br /> scrollListener.onScrollEnded();<br /> }<br /> }</p> <p> /**<br /> * Opens the drawer with an animation.<br /> *<br /> * @see #close()<br /> * @see #open()<br /> * @see #animateClose()<br /> * @see #animateToggle()<br /> * @see #toggle()<br /> */<br /> public void animateOpen() {<br /> prepareContent();<br /> final OnDrawerScrollListener scrollListener = mOnDrawerScrollListener;<br /> if (scrollListener != null) {<br /> scrollListener.onScrollStarted();<br /> }<br /> animateOpen(mVertical ? mHandle.getTop() : mHandle.getLeft());</p> <p> sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);</p> <p> if (scrollListener != null) {<br /> scrollListener.onScrollEnded();<br /> }<br /> }</p> <p> private void closeDrawer() {<br /> moveHandle(COLLAPSED_FULL_CLOSED);<br /> mContent.setVisibility(View.GONE);<br /> mContent.destroyDrawingCache();</p> <p> if (!mExpanded) {<br /> return;<br /> }</p> <p> mExpanded = false;<br /> if (mOnDrawerCloseListener != null) {<br /> mOnDrawerCloseListener.onDrawerClosed();<br /> }<br /> }</p> <p> private void openDrawer() {<br /> moveHandle(EXPANDED_FULL_OPEN);<br /> mContent.setVisibility(View.VISIBLE);</p> <p> if (mExpanded) {<br /> return;<br /> }</p> <p> mExpanded = true;</p> <p> if (mOnDrawerOpenListener != null) {<br /> mOnDrawerOpenListener.onDrawerOpened();<br /> }<br /> }</p> <p> /**<br /> * Sets the listener that receives a notification when the drawer becomes open.<br /> *<br /> * @param onDrawerOpenListener The listener to be notified when the drawer is opened.<br /> */<br /> public void setOnDrawerOpenListener(OnDrawerOpenListener onDrawerOpenListener) {<br /> mOnDrawerOpenListener = onDrawerOpenListener;<br /> }</p> <p> /**<br /> * Sets the listener that receives a notification when the drawer becomes close.<br /> *<br /> * @param onDrawerCloseListener The listener to be notified when the drawer is closed.<br /> */<br /> public void setOnDrawerCloseListener(OnDrawerCloseListener onDrawerCloseListener) {<br /> mOnDrawerCloseListener = onDrawerCloseListener;<br /> }</p> <p> /**<br /> * Sets the listener that receives a notification when the drawer starts or ends<br /> * a scroll. A fling is considered as a scroll. A fling will also trigger a<br /> * drawer opened or drawer closed event.<br /> *<br /> * @param onDrawerScrollListener The listener to be notified when scrolling<br /> * starts or stops.<br /> */<br /> public void setOnDrawerScrollListener(OnDrawerScrollListener onDrawerScrollListener) {<br /> mOnDrawerScrollListener = onDrawerScrollListener;<br /> }</p> <p> /**<br /> * Returns the handle of the drawer.<br /> *<br /> * @return The View reprenseting the handle of the drawer, identified by<br /> * the "handle" id in XML.<br /> */<br /> public View getHandle() {<br /> return mHandle;<br /> }</p> <p> /**<br /> * Returns the content of the drawer.<br /> *<br /> * @return The View reprenseting the content of the drawer, identified by<br /> * the "content" id in XML.<br /> */<br /> public View getContent() {<br /> return mContent;<br /> }</p> <p> /**<br /> * Unlocks the SlidingDrawer so that touch events are processed.<br /> *<br /> * @see #lock()<br /> */<br /> public void unlock() {<br /> mLocked = false;<br /> }</p> <p> /**<br /> * Locks the SlidingDrawer so that touch events are ignores.<br /> *<br /> * @see #unlock()<br /> */<br /> public void lock() {<br /> mLocked = true;<br /> }</p> <p> /**<br /> * Indicates whether the drawer is currently fully opened.<br /> *<br /> * @return True if the drawer is opened, false otherwise.<br /> */<br /> public boolean isOpened() {<br /> return mExpanded;<br /> }</p> <p> /**<br /> * Indicates whether the drawer is scrolling or flinging.<br /> *<br /> * @return True if the drawer is scroller or flinging, false otherwise.<br /> */<br /> public boolean isMoving() {<br /> return mTracking || mAnimating;<br /> }</p> <p> private class DrawerToggler implements OnClickListener {<br /> public void onClick(View v) {<br /> if (mLocked) {<br /> return;<br /> }<br /> // mAllowSingleTap isn't relevant here; you're *always*<br /> // allowed to open/close the drawer by clicking with the<br /> // trackball.</p> <p> if (mAnimateOnClick) {<br /> animateToggle();<br /> } else {<br /> toggle();<br /> }<br /> }<br /> }</p> <p> private class SlidingHandler extends Handler {<br /> public void handleMessage(Message m) {<br /> switch (m.what) {<br /> case MSG_ANIMATE:<br /> doAnimation();<br /> break;<br /> }<br /> }<br /> }<br /> }<br />