am 86320deb: am 667f5956: Use a local copy of HorizontalScrolllView.
* commit '86320deba090bb511d0f5bcb35c2e75b584548d6':
Use a local copy of HorizontalScrolllView.
diff --git a/src/com/android/videoeditor/KenBurnsActivity.java b/src/com/android/videoeditor/KenBurnsActivity.java
index cb9fa0c..37a6808 100755
--- a/src/com/android/videoeditor/KenBurnsActivity.java
+++ b/src/com/android/videoeditor/KenBurnsActivity.java
@@ -326,13 +326,7 @@
mImageView.setEventListener(new ImageViewTouchBase.ImageTouchEventListener() {
@Override
public boolean onImageTouchEvent(MotionEvent ev) {
- if (null != mScaleGestureDetector) {
- mScaleGestureDetector.onTouchEvent(ev);
- if (mScaleGestureDetector.isInProgress()) {
- return true;
- }
- }
-
+ mScaleGestureDetector.onTouchEvent(ev);
mGestureDetector.onTouchEvent(ev);
return true;
}
diff --git a/src/com/android/videoeditor/widgets/HorizontalScrollView.java b/src/com/android/videoeditor/widgets/HorizontalScrollView.java
new file mode 100644
index 0000000..ec7ee93
--- /dev/null
+++ b/src/com/android/videoeditor/widgets/HorizontalScrollView.java
@@ -0,0 +1,1593 @@
+/*
+ * Copyright (C) 2009 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 com.android.videoeditor.widgets;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.Rect;
+import android.os.Bundle;
+import android.util.AttributeSet;
+import android.view.FocusFinder;
+import android.view.InputDevice;
+import android.view.KeyEvent;
+import android.view.MotionEvent;
+import android.view.VelocityTracker;
+import android.view.View;
+import android.view.ViewConfiguration;
+import android.view.ViewDebug;
+import android.view.ViewGroup;
+import android.view.ViewParent;
+import android.view.accessibility.AccessibilityEvent;
+import android.view.accessibility.AccessibilityNodeInfo;
+import android.view.animation.AnimationUtils;
+import android.widget.EdgeEffect;
+import android.widget.FrameLayout;
+import android.widget.OverScroller;
+
+import java.util.List;
+
+/**
+ * Layout container for a view hierarchy that can be scrolled by the user,
+ * allowing it to be larger than the physical display. A HorizontalScrollView
+ * is a {@link FrameLayout}, meaning you should place one child in it
+ * containing the entire contents to scroll; this child may itself be a layout
+ * manager with a complex hierarchy of objects. A child that is often used
+ * is a {@link LinearLayout} in a horizontal orientation, presenting a horizontal
+ * array of top-level items that the user can scroll through.
+ *
+ * <p>The {@link TextView} class also
+ * takes care of its own scrolling, so does not require a HorizontalScrollView, but
+ * using the two together is possible to achieve the effect of a text view
+ * within a larger container.
+ *
+ * <p>HorizontalScrollView only supports horizontal scrolling. For vertical scrolling,
+ * use either {@link ScrollView} or {@link ListView}.
+ *
+ * @attr ref android.R.styleable#HorizontalScrollView_fillViewport
+ */
+public class HorizontalScrollView extends FrameLayout {
+ private static final int ANIMATED_SCROLL_GAP = 250;
+
+ private static final float MAX_SCROLL_FACTOR = 0.5f;
+
+
+ private long mLastScroll;
+
+ private final Rect mTempRect = new Rect();
+ private OverScroller mScroller;
+ private EdgeEffect mEdgeGlowLeft;
+ private EdgeEffect mEdgeGlowRight;
+
+ /**
+ * Position of the last motion event.
+ */
+ private int mLastMotionX;
+
+ /**
+ * True when the layout has changed but the traversal has not come through yet.
+ * Ideally the view hierarchy would keep track of this for us.
+ */
+ private boolean mIsLayoutDirty = true;
+
+ /**
+ * The child to give focus to in the event that a child has requested focus while the
+ * layout is dirty. This prevents the scroll from being wrong if the child has not been
+ * laid out before requesting focus.
+ */
+ private View mChildToScrollTo = null;
+
+ /**
+ * True if the user is currently dragging this ScrollView around. This is
+ * not the same as 'is being flinged', which can be checked by
+ * mScroller.isFinished() (flinging begins when the user lifts his finger).
+ */
+ private boolean mIsBeingDragged = false;
+
+ /**
+ * Determines speed during touch scrolling
+ */
+ private VelocityTracker mVelocityTracker;
+
+ /**
+ * When set to true, the scroll view measure its child to make it fill the currently
+ * visible area.
+ */
+ @ViewDebug.ExportedProperty(category = "layout")
+ private boolean mFillViewport;
+
+ /**
+ * Whether arrow scrolling is animated.
+ */
+ private boolean mSmoothScrollingEnabled = true;
+
+ private int mTouchSlop;
+ private int mMinimumVelocity;
+ private int mMaximumVelocity;
+
+ private int mOverscrollDistance;
+ private int mOverflingDistance;
+
+ /**
+ * ID of the active pointer. This is used to retain consistency during
+ * drags/flings if multiple pointers are used.
+ */
+ private int mActivePointerId = INVALID_POINTER;
+
+ /**
+ * Sentinel value for no current active pointer.
+ * Used by {@link #mActivePointerId}.
+ */
+ private static final int INVALID_POINTER = -1;
+
+ public HorizontalScrollView(Context context) {
+ this(context, null);
+ }
+
+ public HorizontalScrollView(Context context, AttributeSet attrs) {
+ this(context, attrs, com.android.internal.R.attr.horizontalScrollViewStyle);
+ }
+
+ public HorizontalScrollView(Context context, AttributeSet attrs, int defStyle) {
+ super(context, attrs, defStyle);
+ initScrollView();
+
+ TypedArray a = context.obtainStyledAttributes(attrs,
+ android.R.styleable.HorizontalScrollView, defStyle, 0);
+
+ setFillViewport(a.getBoolean(android.R.styleable.HorizontalScrollView_fillViewport, false));
+
+ a.recycle();
+ }
+
+ @Override
+ protected float getLeftFadingEdgeStrength() {
+ if (getChildCount() == 0) {
+ return 0.0f;
+ }
+
+ final int length = getHorizontalFadingEdgeLength();
+ if (mScrollX < length) {
+ return mScrollX / (float) length;
+ }
+
+ return 1.0f;
+ }
+
+ @Override
+ protected float getRightFadingEdgeStrength() {
+ if (getChildCount() == 0) {
+ return 0.0f;
+ }
+
+ final int length = getHorizontalFadingEdgeLength();
+ final int rightEdge = getWidth() - mPaddingRight;
+ final int span = getChildAt(0).getRight() - mScrollX - rightEdge;
+ if (span < length) {
+ return span / (float) length;
+ }
+
+ return 1.0f;
+ }
+
+ /**
+ * @return The maximum amount this scroll view will scroll in response to
+ * an arrow event.
+ */
+ public int getMaxScrollAmount() {
+ return (int) (MAX_SCROLL_FACTOR * (mRight - mLeft));
+ }
+
+
+ private void initScrollView() {
+ mScroller = new OverScroller(getContext());
+ setFocusable(true);
+ setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
+ setWillNotDraw(false);
+ final ViewConfiguration configuration = ViewConfiguration.get(mContext);
+ mTouchSlop = configuration.getScaledTouchSlop();
+ mMinimumVelocity = configuration.getScaledMinimumFlingVelocity();
+ mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
+ mOverscrollDistance = configuration.getScaledOverscrollDistance();
+ mOverflingDistance = configuration.getScaledOverflingDistance();
+ }
+
+ @Override
+ public void addView(View child) {
+ if (getChildCount() > 0) {
+ throw new IllegalStateException("HorizontalScrollView can host only one direct child");
+ }
+
+ super.addView(child);
+ }
+
+ @Override
+ public void addView(View child, int index) {
+ if (getChildCount() > 0) {
+ throw new IllegalStateException("HorizontalScrollView can host only one direct child");
+ }
+
+ super.addView(child, index);
+ }
+
+ @Override
+ public void addView(View child, ViewGroup.LayoutParams params) {
+ if (getChildCount() > 0) {
+ throw new IllegalStateException("HorizontalScrollView can host only one direct child");
+ }
+
+ super.addView(child, params);
+ }
+
+ @Override
+ public void addView(View child, int index, ViewGroup.LayoutParams params) {
+ if (getChildCount() > 0) {
+ throw new IllegalStateException("HorizontalScrollView can host only one direct child");
+ }
+
+ super.addView(child, index, params);
+ }
+
+ /**
+ * @return Returns true this HorizontalScrollView can be scrolled
+ */
+ private boolean canScroll() {
+ View child = getChildAt(0);
+ if (child != null) {
+ int childWidth = child.getWidth();
+ return getWidth() < childWidth + mPaddingLeft + mPaddingRight ;
+ }
+ return false;
+ }
+
+ /**
+ * Indicates whether this HorizontalScrollView's content is stretched to
+ * fill the viewport.
+ *
+ * @return True if the content fills the viewport, false otherwise.
+ *
+ * @attr ref android.R.styleable#HorizontalScrollView_fillViewport
+ */
+ public boolean isFillViewport() {
+ return mFillViewport;
+ }
+
+ /**
+ * Indicates this HorizontalScrollView whether it should stretch its content width
+ * to fill the viewport or not.
+ *
+ * @param fillViewport True to stretch the content's width to the viewport's
+ * boundaries, false otherwise.
+ *
+ * @attr ref android.R.styleable#HorizontalScrollView_fillViewport
+ */
+ public void setFillViewport(boolean fillViewport) {
+ if (fillViewport != mFillViewport) {
+ mFillViewport = fillViewport;
+ requestLayout();
+ }
+ }
+
+ /**
+ * @return Whether arrow scrolling will animate its transition.
+ */
+ public boolean isSmoothScrollingEnabled() {
+ return mSmoothScrollingEnabled;
+ }
+
+ /**
+ * Set whether arrow scrolling will animate its transition.
+ * @param smoothScrollingEnabled whether arrow scrolling will animate its transition
+ */
+ public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) {
+ mSmoothScrollingEnabled = smoothScrollingEnabled;
+ }
+
+ @Override
+ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+ super.onMeasure(widthMeasureSpec, heightMeasureSpec);
+
+ if (!mFillViewport) {
+ return;
+ }
+
+ final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
+ if (widthMode == MeasureSpec.UNSPECIFIED) {
+ return;
+ }
+
+ if (getChildCount() > 0) {
+ final View child = getChildAt(0);
+ int width = getMeasuredWidth();
+ if (child.getMeasuredWidth() < width) {
+ final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams();
+
+ int childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec, mPaddingTop
+ + mPaddingBottom, lp.height);
+ width -= mPaddingLeft;
+ width -= mPaddingRight;
+ int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY);
+
+ child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
+ }
+ }
+ }
+
+ @Override
+ public boolean dispatchKeyEvent(KeyEvent event) {
+ // Let the focused view and/or our descendants get the key first
+ return super.dispatchKeyEvent(event) || executeKeyEvent(event);
+ }
+
+ /**
+ * You can call this function yourself to have the scroll view perform
+ * scrolling from a key event, just as if the event had been dispatched to
+ * it by the view hierarchy.
+ *
+ * @param event The key event to execute.
+ * @return Return true if the event was handled, else false.
+ */
+ public boolean executeKeyEvent(KeyEvent event) {
+ mTempRect.setEmpty();
+
+ if (!canScroll()) {
+ if (isFocused()) {
+ View currentFocused = findFocus();
+ if (currentFocused == this) currentFocused = null;
+ View nextFocused = FocusFinder.getInstance().findNextFocus(this,
+ currentFocused, View.FOCUS_RIGHT);
+ return nextFocused != null && nextFocused != this &&
+ nextFocused.requestFocus(View.FOCUS_RIGHT);
+ }
+ return false;
+ }
+
+ boolean handled = false;
+ if (event.getAction() == KeyEvent.ACTION_DOWN) {
+ switch (event.getKeyCode()) {
+ case KeyEvent.KEYCODE_DPAD_LEFT:
+ if (!event.isAltPressed()) {
+ handled = arrowScroll(View.FOCUS_LEFT);
+ } else {
+ handled = fullScroll(View.FOCUS_LEFT);
+ }
+ break;
+ case KeyEvent.KEYCODE_DPAD_RIGHT:
+ if (!event.isAltPressed()) {
+ handled = arrowScroll(View.FOCUS_RIGHT);
+ } else {
+ handled = fullScroll(View.FOCUS_RIGHT);
+ }
+ break;
+ case KeyEvent.KEYCODE_SPACE:
+ pageScroll(event.isShiftPressed() ? View.FOCUS_LEFT : View.FOCUS_RIGHT);
+ break;
+ }
+ }
+
+ return handled;
+ }
+
+ private boolean inChild(int x, int y) {
+ if (getChildCount() > 0) {
+ final int scrollX = mScrollX;
+ final View child = getChildAt(0);
+ return !(y < child.getTop()
+ || y >= child.getBottom()
+ || x < child.getLeft() - scrollX
+ || x >= child.getRight() - scrollX);
+ }
+ return false;
+ }
+
+ private void initOrResetVelocityTracker() {
+ if (mVelocityTracker == null) {
+ mVelocityTracker = VelocityTracker.obtain();
+ } else {
+ mVelocityTracker.clear();
+ }
+ }
+
+ private void initVelocityTrackerIfNotExists() {
+ if (mVelocityTracker == null) {
+ mVelocityTracker = VelocityTracker.obtain();
+ }
+ }
+
+ private void recycleVelocityTracker() {
+ if (mVelocityTracker != null) {
+ mVelocityTracker.recycle();
+ mVelocityTracker = null;
+ }
+ }
+
+ @Override
+ public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
+ if (disallowIntercept) {
+ recycleVelocityTracker();
+ }
+ super.requestDisallowInterceptTouchEvent(disallowIntercept);
+ }
+
+ @Override
+ public boolean onInterceptTouchEvent(MotionEvent ev) {
+ /*
+ * This method JUST determines whether we want to intercept the motion.
+ * If we return true, onMotionEvent will be called and we do the actual
+ * scrolling there.
+ */
+
+ /*
+ * Shortcut the most recurring case: the user is in the dragging
+ * state and he is moving his finger. We want to intercept this
+ * motion.
+ */
+ final int action = ev.getAction();
+ if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) {
+ return true;
+ }
+
+ switch (action & MotionEvent.ACTION_MASK) {
+ case MotionEvent.ACTION_MOVE: {
+ /*
+ * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
+ * whether the user has moved far enough from his original down touch.
+ */
+
+ /*
+ * Locally do absolute value. mLastMotionX is set to the x value
+ * of the down event.
+ */
+ final int activePointerId = mActivePointerId;
+ if (activePointerId == INVALID_POINTER) {
+ // If we don't have a valid id, the touch down wasn't on content.
+ break;
+ }
+
+ final int pointerIndex = ev.findPointerIndex(activePointerId);
+ final int x = (int) ev.getX(pointerIndex);
+ final int xDiff = (int) Math.abs(x - mLastMotionX);
+ if (xDiff > mTouchSlop) {
+ mIsBeingDragged = true;
+ mLastMotionX = x;
+ initVelocityTrackerIfNotExists();
+ mVelocityTracker.addMovement(ev);
+ if (mParent != null) mParent.requestDisallowInterceptTouchEvent(true);
+ }
+ break;
+ }
+
+ case MotionEvent.ACTION_DOWN: {
+ final int x = (int) ev.getX();
+ if (!inChild((int) x, (int) ev.getY())) {
+ mIsBeingDragged = false;
+ recycleVelocityTracker();
+ break;
+ }
+
+ /*
+ * Remember location of down touch.
+ * ACTION_DOWN always refers to pointer index 0.
+ */
+ mLastMotionX = x;
+ mActivePointerId = ev.getPointerId(0);
+
+ initOrResetVelocityTracker();
+ mVelocityTracker.addMovement(ev);
+
+ /*
+ * If being flinged and user touches the screen, initiate drag;
+ * otherwise don't. mScroller.isFinished should be false when
+ * being flinged.
+ */
+ mIsBeingDragged = !mScroller.isFinished();
+ break;
+ }
+
+ case MotionEvent.ACTION_CANCEL:
+ case MotionEvent.ACTION_UP:
+ /* Release the drag */
+ mIsBeingDragged = false;
+ mActivePointerId = INVALID_POINTER;
+ if (mScroller.springBack(mScrollX, mScrollY, 0, getScrollRange(), 0, 0)) {
+ postInvalidateOnAnimation();
+ }
+ break;
+ case MotionEvent.ACTION_POINTER_DOWN: {
+ final int index = ev.getActionIndex();
+ mLastMotionX = (int) ev.getX(index);
+ mActivePointerId = ev.getPointerId(index);
+ break;
+ }
+ case MotionEvent.ACTION_POINTER_UP:
+ onSecondaryPointerUp(ev);
+ mLastMotionX = (int) ev.getX(ev.findPointerIndex(mActivePointerId));
+ break;
+ }
+
+ /*
+ * The only time we want to intercept motion events is if we are in the
+ * drag mode.
+ */
+ return mIsBeingDragged;
+ }
+
+ @Override
+ public boolean onTouchEvent(MotionEvent ev) {
+ initVelocityTrackerIfNotExists();
+ mVelocityTracker.addMovement(ev);
+
+ final int action = ev.getAction();
+
+ switch (action & MotionEvent.ACTION_MASK) {
+ case MotionEvent.ACTION_DOWN: {
+ if (getChildCount() == 0) {
+ return false;
+ }
+ if ((mIsBeingDragged = !mScroller.isFinished())) {
+ final ViewParent parent = getParent();
+ if (parent != null) {
+ parent.requestDisallowInterceptTouchEvent(true);
+ }
+ }
+
+ /*
+ * If being flinged and user touches, stop the fling. isFinished
+ * will be false if being flinged.
+ */
+ if (!mScroller.isFinished()) {
+ mScroller.abortAnimation();
+ }
+
+ // Remember where the motion event started
+ mLastMotionX = (int) ev.getX();
+ mActivePointerId = ev.getPointerId(0);
+ break;
+ }
+ case MotionEvent.ACTION_MOVE:
+ final int activePointerIndex = ev.findPointerIndex(mActivePointerId);
+ final int x = (int) ev.getX(activePointerIndex);
+ int deltaX = mLastMotionX - x;
+ if (!mIsBeingDragged && Math.abs(deltaX) > mTouchSlop) {
+ final ViewParent parent = getParent();
+ if (parent != null) {
+ parent.requestDisallowInterceptTouchEvent(true);
+ }
+ mIsBeingDragged = true;
+ if (deltaX > 0) {
+ deltaX -= mTouchSlop;
+ } else {
+ deltaX += mTouchSlop;
+ }
+ }
+ if (mIsBeingDragged) {
+ // Scroll to follow the motion event
+ mLastMotionX = x;
+
+ final int oldX = mScrollX;
+ final int oldY = mScrollY;
+ final int range = getScrollRange();
+ final int overscrollMode = getOverScrollMode();
+ final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS ||
+ (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0);
+
+ if (overScrollBy(deltaX, 0, mScrollX, 0, range, 0,
+ mOverscrollDistance, 0, true)) {
+ // Break our velocity if we hit a scroll barrier.
+ mVelocityTracker.clear();
+ }
+ onScrollChanged(mScrollX, mScrollY, oldX, oldY);
+
+ if (canOverscroll) {
+ final int pulledToX = oldX + deltaX;
+ if (pulledToX < 0) {
+ mEdgeGlowLeft.onPull((float) deltaX / getWidth());
+ if (!mEdgeGlowRight.isFinished()) {
+ mEdgeGlowRight.onRelease();
+ }
+ } else if (pulledToX > range) {
+ mEdgeGlowRight.onPull((float) deltaX / getWidth());
+ if (!mEdgeGlowLeft.isFinished()) {
+ mEdgeGlowLeft.onRelease();
+ }
+ }
+ if (mEdgeGlowLeft != null
+ && (!mEdgeGlowLeft.isFinished() || !mEdgeGlowRight.isFinished())) {
+ postInvalidateOnAnimation();
+ }
+ }
+ }
+ break;
+ case MotionEvent.ACTION_UP:
+ if (mIsBeingDragged) {
+ final VelocityTracker velocityTracker = mVelocityTracker;
+ velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
+ int initialVelocity = (int) velocityTracker.getXVelocity(mActivePointerId);
+
+ if (getChildCount() > 0) {
+ if ((Math.abs(initialVelocity) > mMinimumVelocity)) {
+ fling(-initialVelocity);
+ } else {
+ if (mScroller.springBack(mScrollX, mScrollY, 0,
+ getScrollRange(), 0, 0)) {
+ postInvalidateOnAnimation();
+ }
+ }
+ }
+
+ mActivePointerId = INVALID_POINTER;
+ mIsBeingDragged = false;
+ recycleVelocityTracker();
+
+ if (mEdgeGlowLeft != null) {
+ mEdgeGlowLeft.onRelease();
+ mEdgeGlowRight.onRelease();
+ }
+ }
+ break;
+ case MotionEvent.ACTION_CANCEL:
+ if (mIsBeingDragged && getChildCount() > 0) {
+ if (mScroller.springBack(mScrollX, mScrollY, 0, getScrollRange(), 0, 0)) {
+ postInvalidateOnAnimation();
+ }
+ mActivePointerId = INVALID_POINTER;
+ mIsBeingDragged = false;
+ recycleVelocityTracker();
+
+ if (mEdgeGlowLeft != null) {
+ mEdgeGlowLeft.onRelease();
+ mEdgeGlowRight.onRelease();
+ }
+ }
+ break;
+ case MotionEvent.ACTION_POINTER_UP:
+ onSecondaryPointerUp(ev);
+ break;
+ }
+ return true;
+ }
+
+ private void onSecondaryPointerUp(MotionEvent ev) {
+ final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >>
+ MotionEvent.ACTION_POINTER_INDEX_SHIFT;
+ final int pointerId = ev.getPointerId(pointerIndex);
+ if (pointerId == mActivePointerId) {
+ // This was our active pointer going up. Choose a new
+ // active pointer and adjust accordingly.
+ // TODO: Make this decision more intelligent.
+ final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
+ mLastMotionX = (int) ev.getX(newPointerIndex);
+ mActivePointerId = ev.getPointerId(newPointerIndex);
+ if (mVelocityTracker != null) {
+ mVelocityTracker.clear();
+ }
+ }
+ }
+
+ @Override
+ public boolean onGenericMotionEvent(MotionEvent event) {
+ if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) {
+ switch (event.getAction()) {
+ case MotionEvent.ACTION_SCROLL: {
+ if (!mIsBeingDragged) {
+ final float hscroll;
+ if ((event.getMetaState() & KeyEvent.META_SHIFT_ON) != 0) {
+ hscroll = -event.getAxisValue(MotionEvent.AXIS_VSCROLL);
+ } else {
+ hscroll = event.getAxisValue(MotionEvent.AXIS_HSCROLL);
+ }
+ if (hscroll != 0) {
+ final int delta = (int) (hscroll * getHorizontalScrollFactor());
+ final int range = getScrollRange();
+ int oldScrollX = mScrollX;
+ int newScrollX = oldScrollX + delta;
+ if (newScrollX < 0) {
+ newScrollX = 0;
+ } else if (newScrollX > range) {
+ newScrollX = range;
+ }
+ if (newScrollX != oldScrollX) {
+ super.scrollTo(newScrollX, mScrollY);
+ return true;
+ }
+ }
+ }
+ }
+ }
+ }
+ return super.onGenericMotionEvent(event);
+ }
+
+ @Override
+ public boolean shouldDelayChildPressedState() {
+ return true;
+ }
+
+ @Override
+ protected void onOverScrolled(int scrollX, int scrollY,
+ boolean clampedX, boolean clampedY) {
+ // Treat animating scrolls differently; see #computeScroll() for why.
+ if (!mScroller.isFinished()) {
+ mScrollX = scrollX;
+ mScrollY = scrollY;
+ invalidateParentIfNeeded();
+ if (clampedX) {
+ mScroller.springBack(mScrollX, mScrollY, 0, getScrollRange(), 0, 0);
+ }
+ } else {
+ super.scrollTo(scrollX, scrollY);
+ }
+
+ awakenScrollBars();
+ }
+
+ @Override
+ public boolean performAccessibilityAction(int action, Bundle arguments) {
+ if (super.performAccessibilityAction(action, arguments)) {
+ return true;
+ }
+ switch (action) {
+ case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: {
+ if (!isEnabled()) {
+ return false;
+ }
+ final int viewportWidth = getWidth() - mPaddingLeft - mPaddingRight;
+ final int targetScrollX = Math.min(mScrollX + viewportWidth, getScrollRange());
+ if (targetScrollX != mScrollX) {
+ smoothScrollTo(targetScrollX, 0);
+ return true;
+ }
+ } return false;
+ case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: {
+ if (!isEnabled()) {
+ return false;
+ }
+ final int viewportWidth = getWidth() - mPaddingLeft - mPaddingRight;
+ final int targetScrollX = Math.max(0, mScrollX - viewportWidth);
+ if (targetScrollX != mScrollX) {
+ smoothScrollTo(targetScrollX, 0);
+ return true;
+ }
+ } return false;
+ }
+ return false;
+ }
+
+ @Override
+ public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
+ super.onInitializeAccessibilityNodeInfo(info);
+ info.setClassName(HorizontalScrollView.class.getName());
+ final int scrollRange = getScrollRange();
+ if (scrollRange > 0) {
+ info.setScrollable(true);
+ if (isEnabled() && mScrollX > 0) {
+ info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
+ }
+ if (isEnabled() && mScrollX < scrollRange) {
+ info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD);
+ }
+ }
+ }
+
+ @Override
+ public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
+ super.onInitializeAccessibilityEvent(event);
+ event.setClassName(HorizontalScrollView.class.getName());
+ event.setScrollable(getScrollRange() > 0);
+ event.setScrollX(mScrollX);
+ event.setScrollY(mScrollY);
+ event.setMaxScrollX(getScrollRange());
+ event.setMaxScrollY(mScrollY);
+ }
+
+ private int getScrollRange() {
+ int scrollRange = 0;
+ if (getChildCount() > 0) {
+ View child = getChildAt(0);
+ scrollRange = Math.max(0,
+ child.getWidth() - (getWidth() - mPaddingLeft - mPaddingRight));
+ }
+ return scrollRange;
+ }
+
+ /**
+ * <p>
+ * Finds the next focusable component that fits in this View's bounds
+ * (excluding fading edges) pretending that this View's left is located at
+ * the parameter left.
+ * </p>
+ *
+ * @param leftFocus look for a candidate is the one at the left of the bounds
+ * if leftFocus is true, or at the right of the bounds if leftFocus
+ * is false
+ * @param left the left offset of the bounds in which a focusable must be
+ * found (the fading edge is assumed to start at this position)
+ * @param preferredFocusable the View that has highest priority and will be
+ * returned if it is within my bounds (null is valid)
+ * @return the next focusable component in the bounds or null if none can be found
+ */
+ private View findFocusableViewInMyBounds(final boolean leftFocus,
+ final int left, View preferredFocusable) {
+ /*
+ * The fading edge's transparent side should be considered for focus
+ * since it's mostly visible, so we divide the actual fading edge length
+ * by 2.
+ */
+ final int fadingEdgeLength = getHorizontalFadingEdgeLength() / 2;
+ final int leftWithoutFadingEdge = left + fadingEdgeLength;
+ final int rightWithoutFadingEdge = left + getWidth() - fadingEdgeLength;
+
+ if ((preferredFocusable != null)
+ && (preferredFocusable.getLeft() < rightWithoutFadingEdge)
+ && (preferredFocusable.getRight() > leftWithoutFadingEdge)) {
+ return preferredFocusable;
+ }
+
+ return findFocusableViewInBounds(leftFocus, leftWithoutFadingEdge,
+ rightWithoutFadingEdge);
+ }
+
+ /**
+ * <p>
+ * Finds the next focusable component that fits in the specified bounds.
+ * </p>
+ *
+ * @param leftFocus look for a candidate is the one at the left of the bounds
+ * if leftFocus is true, or at the right of the bounds if
+ * leftFocus is false
+ * @param left the left offset of the bounds in which a focusable must be
+ * found
+ * @param right the right offset of the bounds in which a focusable must
+ * be found
+ * @return the next focusable component in the bounds or null if none can
+ * be found
+ */
+ private View findFocusableViewInBounds(boolean leftFocus, int left, int right) {
+
+ List<View> focusables = getFocusables(View.FOCUS_FORWARD);
+ View focusCandidate = null;
+
+ /*
+ * A fully contained focusable is one where its left is below the bound's
+ * left, and its right is above the bound's right. A partially
+ * contained focusable is one where some part of it is within the
+ * bounds, but it also has some part that is not within bounds. A fully contained
+ * focusable is preferred to a partially contained focusable.
+ */
+ boolean foundFullyContainedFocusable = false;
+
+ int count = focusables.size();
+ for (int i = 0; i < count; i++) {
+ View view = focusables.get(i);
+ int viewLeft = view.getLeft();
+ int viewRight = view.getRight();
+
+ if (left < viewRight && viewLeft < right) {
+ /*
+ * the focusable is in the target area, it is a candidate for
+ * focusing
+ */
+
+ final boolean viewIsFullyContained = (left < viewLeft) &&
+ (viewRight < right);
+
+ if (focusCandidate == null) {
+ /* No candidate, take this one */
+ focusCandidate = view;
+ foundFullyContainedFocusable = viewIsFullyContained;
+ } else {
+ final boolean viewIsCloserToBoundary =
+ (leftFocus && viewLeft < focusCandidate.getLeft()) ||
+ (!leftFocus && viewRight > focusCandidate.getRight());
+
+ if (foundFullyContainedFocusable) {
+ if (viewIsFullyContained && viewIsCloserToBoundary) {
+ /*
+ * We're dealing with only fully contained views, so
+ * it has to be closer to the boundary to beat our
+ * candidate
+ */
+ focusCandidate = view;
+ }
+ } else {
+ if (viewIsFullyContained) {
+ /* Any fully contained view beats a partially contained view */
+ focusCandidate = view;
+ foundFullyContainedFocusable = true;
+ } else if (viewIsCloserToBoundary) {
+ /*
+ * Partially contained view beats another partially
+ * contained view if it's closer
+ */
+ focusCandidate = view;
+ }
+ }
+ }
+ }
+ }
+
+ return focusCandidate;
+ }
+
+ /**
+ * <p>Handles scrolling in response to a "page up/down" shortcut press. This
+ * method will scroll the view by one page left or right and give the focus
+ * to the leftmost/rightmost component in the new visible area. If no
+ * component is a good candidate for focus, this scrollview reclaims the
+ * focus.</p>
+ *
+ * @param direction the scroll direction: {@link android.view.View#FOCUS_LEFT}
+ * to go one page left or {@link android.view.View#FOCUS_RIGHT}
+ * to go one page right
+ * @return true if the key event is consumed by this method, false otherwise
+ */
+ public boolean pageScroll(int direction) {
+ boolean right = direction == View.FOCUS_RIGHT;
+ int width = getWidth();
+
+ if (right) {
+ mTempRect.left = getScrollX() + width;
+ int count = getChildCount();
+ if (count > 0) {
+ View view = getChildAt(0);
+ if (mTempRect.left + width > view.getRight()) {
+ mTempRect.left = view.getRight() - width;
+ }
+ }
+ } else {
+ mTempRect.left = getScrollX() - width;
+ if (mTempRect.left < 0) {
+ mTempRect.left = 0;
+ }
+ }
+ mTempRect.right = mTempRect.left + width;
+
+ return scrollAndFocus(direction, mTempRect.left, mTempRect.right);
+ }
+
+ /**
+ * <p>Handles scrolling in response to a "home/end" shortcut press. This
+ * method will scroll the view to the left or right and give the focus
+ * to the leftmost/rightmost component in the new visible area. If no
+ * component is a good candidate for focus, this scrollview reclaims the
+ * focus.</p>
+ *
+ * @param direction the scroll direction: {@link android.view.View#FOCUS_LEFT}
+ * to go the left of the view or {@link android.view.View#FOCUS_RIGHT}
+ * to go the right
+ * @return true if the key event is consumed by this method, false otherwise
+ */
+ public boolean fullScroll(int direction) {
+ boolean right = direction == View.FOCUS_RIGHT;
+ int width = getWidth();
+
+ mTempRect.left = 0;
+ mTempRect.right = width;
+
+ if (right) {
+ int count = getChildCount();
+ if (count > 0) {
+ View view = getChildAt(0);
+ mTempRect.right = view.getRight();
+ mTempRect.left = mTempRect.right - width;
+ }
+ }
+
+ return scrollAndFocus(direction, mTempRect.left, mTempRect.right);
+ }
+
+ /**
+ * <p>Scrolls the view to make the area defined by <code>left</code> and
+ * <code>right</code> visible. This method attempts to give the focus
+ * to a component visible in this area. If no component can be focused in
+ * the new visible area, the focus is reclaimed by this scrollview.</p>
+ *
+ * @param direction the scroll direction: {@link android.view.View#FOCUS_LEFT}
+ * to go left {@link android.view.View#FOCUS_RIGHT} to right
+ * @param left the left offset of the new area to be made visible
+ * @param right the right offset of the new area to be made visible
+ * @return true if the key event is consumed by this method, false otherwise
+ */
+ private boolean scrollAndFocus(int direction, int left, int right) {
+ boolean handled = true;
+
+ int width = getWidth();
+ int containerLeft = getScrollX();
+ int containerRight = containerLeft + width;
+ boolean goLeft = direction == View.FOCUS_LEFT;
+
+ View newFocused = findFocusableViewInBounds(goLeft, left, right);
+ if (newFocused == null) {
+ newFocused = this;
+ }
+
+ if (left >= containerLeft && right <= containerRight) {
+ handled = false;
+ } else {
+ int delta = goLeft ? (left - containerLeft) : (right - containerRight);
+ doScrollX(delta);
+ }
+
+ if (newFocused != findFocus()) newFocused.requestFocus(direction);
+
+ return handled;
+ }
+
+ /**
+ * Handle scrolling in response to a left or right arrow click.
+ *
+ * @param direction The direction corresponding to the arrow key that was
+ * pressed
+ * @return True if we consumed the event, false otherwise
+ */
+ public boolean arrowScroll(int direction) {
+
+ View currentFocused = findFocus();
+ if (currentFocused == this) currentFocused = null;
+
+ View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction);
+
+ final int maxJump = getMaxScrollAmount();
+
+ if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump)) {
+ nextFocused.getDrawingRect(mTempRect);
+ offsetDescendantRectToMyCoords(nextFocused, mTempRect);
+ int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
+ doScrollX(scrollDelta);
+ nextFocused.requestFocus(direction);
+ } else {
+ // no new focus
+ int scrollDelta = maxJump;
+
+ if (direction == View.FOCUS_LEFT && getScrollX() < scrollDelta) {
+ scrollDelta = getScrollX();
+ } else if (direction == View.FOCUS_RIGHT && getChildCount() > 0) {
+
+ int daRight = getChildAt(0).getRight();
+
+ int screenRight = getScrollX() + getWidth();
+
+ if (daRight - screenRight < maxJump) {
+ scrollDelta = daRight - screenRight;
+ }
+ }
+ if (scrollDelta == 0) {
+ return false;
+ }
+ doScrollX(direction == View.FOCUS_RIGHT ? scrollDelta : -scrollDelta);
+ }
+
+ if (currentFocused != null && currentFocused.isFocused()
+ && isOffScreen(currentFocused)) {
+ // previously focused item still has focus and is off screen, give
+ // it up (take it back to ourselves)
+ // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are
+ // sure to
+ // get it)
+ final int descendantFocusability = getDescendantFocusability(); // save
+ setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
+ requestFocus();
+ setDescendantFocusability(descendantFocusability); // restore
+ }
+ return true;
+ }
+
+ /**
+ * @return whether the descendant of this scroll view is scrolled off
+ * screen.
+ */
+ private boolean isOffScreen(View descendant) {
+ return !isWithinDeltaOfScreen(descendant, 0);
+ }
+
+ /**
+ * @return whether the descendant of this scroll view is within delta
+ * pixels of being on the screen.
+ */
+ private boolean isWithinDeltaOfScreen(View descendant, int delta) {
+ descendant.getDrawingRect(mTempRect);
+ offsetDescendantRectToMyCoords(descendant, mTempRect);
+
+ return (mTempRect.right + delta) >= getScrollX()
+ && (mTempRect.left - delta) <= (getScrollX() + getWidth());
+ }
+
+ /**
+ * Smooth scroll by a X delta
+ *
+ * @param delta the number of pixels to scroll by on the X axis
+ */
+ private void doScrollX(int delta) {
+ if (delta != 0) {
+ if (mSmoothScrollingEnabled) {
+ smoothScrollBy(delta, 0);
+ } else {
+ scrollBy(delta, 0);
+ }
+ }
+ }
+
+ /**
+ * Like {@link View#scrollBy}, but scroll smoothly instead of immediately.
+ *
+ * @param dx the number of pixels to scroll by on the X axis
+ * @param dy the number of pixels to scroll by on the Y axis
+ */
+ public final void smoothScrollBy(int dx, int dy) {
+ if (getChildCount() == 0) {
+ // Nothing to do.
+ return;
+ }
+ long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll;
+ if (duration > ANIMATED_SCROLL_GAP) {
+ final int width = getWidth() - mPaddingRight - mPaddingLeft;
+ final int right = getChildAt(0).getWidth();
+ final int maxX = Math.max(0, right - width);
+ final int scrollX = mScrollX;
+ dx = Math.max(0, Math.min(scrollX + dx, maxX)) - scrollX;
+
+ mScroller.startScroll(scrollX, mScrollY, dx, 0);
+ postInvalidateOnAnimation();
+ } else {
+ if (!mScroller.isFinished()) {
+ mScroller.abortAnimation();
+ }
+ scrollBy(dx, dy);
+ }
+ mLastScroll = AnimationUtils.currentAnimationTimeMillis();
+ }
+
+ /**
+ * Like {@link #scrollTo}, but scroll smoothly instead of immediately.
+ *
+ * @param x the position where to scroll on the X axis
+ * @param y the position where to scroll on the Y axis
+ */
+ public final void smoothScrollTo(int x, int y) {
+ smoothScrollBy(x - mScrollX, y - mScrollY);
+ }
+
+ /**
+ * <p>The scroll range of a scroll view is the overall width of all of its
+ * children.</p>
+ */
+ @Override
+ protected int computeHorizontalScrollRange() {
+ final int count = getChildCount();
+ final int contentWidth = getWidth() - mPaddingLeft - mPaddingRight;
+ if (count == 0) {
+ return contentWidth;
+ }
+
+ int scrollRange = getChildAt(0).getRight();
+ final int scrollX = mScrollX;
+ final int overscrollRight = Math.max(0, scrollRange - contentWidth);
+ if (scrollX < 0) {
+ scrollRange -= scrollX;
+ } else if (scrollX > overscrollRight) {
+ scrollRange += scrollX - overscrollRight;
+ }
+
+ return scrollRange;
+ }
+
+ @Override
+ protected int computeHorizontalScrollOffset() {
+ return Math.max(0, super.computeHorizontalScrollOffset());
+ }
+
+ @Override
+ protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) {
+ ViewGroup.LayoutParams lp = child.getLayoutParams();
+
+ int childWidthMeasureSpec;
+ int childHeightMeasureSpec;
+
+ childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, mPaddingTop
+ + mPaddingBottom, lp.height);
+
+ childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
+
+ child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
+ }
+
+ @Override
+ protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed,
+ int parentHeightMeasureSpec, int heightUsed) {
+ final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
+
+ final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec,
+ mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin
+ + heightUsed, lp.height);
+ final int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(
+ lp.leftMargin + lp.rightMargin, MeasureSpec.UNSPECIFIED);
+
+ child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
+ }
+
+ @Override
+ public void computeScroll() {
+ if (mScroller.computeScrollOffset()) {
+ // This is called at drawing time by ViewGroup. We don't want to
+ // re-show the scrollbars at this point, which scrollTo will do,
+ // so we replicate most of scrollTo here.
+ //
+ // It's a little odd to call onScrollChanged from inside the drawing.
+ //
+ // It is, except when you remember that computeScroll() is used to
+ // animate scrolling. So unless we want to defer the onScrollChanged()
+ // until the end of the animated scrolling, we don't really have a
+ // choice here.
+ //
+ // I agree. The alternative, which I think would be worse, is to post
+ // something and tell the subclasses later. This is bad because there
+ // will be a window where mScrollX/Y is different from what the app
+ // thinks it is.
+ //
+ int oldX = mScrollX;
+ int oldY = mScrollY;
+ int x = mScroller.getCurrX();
+ int y = mScroller.getCurrY();
+
+ if (oldX != x || oldY != y) {
+ final int range = getScrollRange();
+ final int overscrollMode = getOverScrollMode();
+ final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS ||
+ (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0);
+
+ overScrollBy(x - oldX, y - oldY, oldX, oldY, range, 0,
+ mOverflingDistance, 0, false);
+ onScrollChanged(mScrollX, mScrollY, oldX, oldY);
+
+ if (canOverscroll) {
+ if (x < 0 && oldX >= 0) {
+ mEdgeGlowLeft.onAbsorb((int) mScroller.getCurrVelocity());
+ } else if (x > range && oldX <= range) {
+ mEdgeGlowRight.onAbsorb((int) mScroller.getCurrVelocity());
+ }
+ }
+ }
+
+ if (!awakenScrollBars()) {
+ postInvalidateOnAnimation();
+ }
+ }
+ }
+
+ /**
+ * Scrolls the view to the given child.
+ *
+ * @param child the View to scroll to
+ */
+ private void scrollToChild(View child) {
+ child.getDrawingRect(mTempRect);
+
+ /* Offset from child's local coordinates to ScrollView coordinates */
+ offsetDescendantRectToMyCoords(child, mTempRect);
+
+ int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
+
+ if (scrollDelta != 0) {
+ scrollBy(scrollDelta, 0);
+ }
+ }
+
+ /**
+ * If rect is off screen, scroll just enough to get it (or at least the
+ * first screen size chunk of it) on screen.
+ *
+ * @param rect The rectangle.
+ * @param immediate True to scroll immediately without animation
+ * @return true if scrolling was performed
+ */
+ private boolean scrollToChildRect(Rect rect, boolean immediate) {
+ final int delta = computeScrollDeltaToGetChildRectOnScreen(rect);
+ final boolean scroll = delta != 0;
+ if (scroll) {
+ if (immediate) {
+ scrollBy(delta, 0);
+ } else {
+ smoothScrollBy(delta, 0);
+ }
+ }
+ return scroll;
+ }
+
+ /**
+ * Compute the amount to scroll in the X direction in order to get
+ * a rectangle completely on the screen (or, if taller than the screen,
+ * at least the first screen size chunk of it).
+ *
+ * @param rect The rect.
+ * @return The scroll delta.
+ */
+ protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) {
+ if (getChildCount() == 0) return 0;
+
+ int width = getWidth();
+ int screenLeft = getScrollX();
+ int screenRight = screenLeft + width;
+
+ int fadingEdge = getHorizontalFadingEdgeLength();
+
+ // leave room for left fading edge as long as rect isn't at very left
+ if (rect.left > 0) {
+ screenLeft += fadingEdge;
+ }
+
+ // leave room for right fading edge as long as rect isn't at very right
+ if (rect.right < getChildAt(0).getWidth()) {
+ screenRight -= fadingEdge;
+ }
+
+ int scrollXDelta = 0;
+
+ if (rect.right > screenRight && rect.left > screenLeft) {
+ // need to move right to get it in view: move right just enough so
+ // that the entire rectangle is in view (or at least the first
+ // screen size chunk).
+
+ if (rect.width() > width) {
+ // just enough to get screen size chunk on
+ scrollXDelta += (rect.left - screenLeft);
+ } else {
+ // get entire rect at right of screen
+ scrollXDelta += (rect.right - screenRight);
+ }
+
+ // make sure we aren't scrolling beyond the end of our content
+ int right = getChildAt(0).getRight();
+ int distanceToRight = right - screenRight;
+ scrollXDelta = Math.min(scrollXDelta, distanceToRight);
+
+ } else if (rect.left < screenLeft && rect.right < screenRight) {
+ // need to move right to get it in view: move right just enough so that
+ // entire rectangle is in view (or at least the first screen
+ // size chunk of it).
+
+ if (rect.width() > width) {
+ // screen size chunk
+ scrollXDelta -= (screenRight - rect.right);
+ } else {
+ // entire rect at left
+ scrollXDelta -= (screenLeft - rect.left);
+ }
+
+ // make sure we aren't scrolling any further than the left our content
+ scrollXDelta = Math.max(scrollXDelta, -getScrollX());
+ }
+ return scrollXDelta;
+ }
+
+ @Override
+ public void requestChildFocus(View child, View focused) {
+ if (!mIsLayoutDirty) {
+ scrollToChild(focused);
+ } else {
+ // The child may not be laid out yet, we can't compute the scroll yet
+ mChildToScrollTo = focused;
+ }
+ super.requestChildFocus(child, focused);
+ }
+
+
+ /**
+ * When looking for focus in children of a scroll view, need to be a little
+ * more careful not to give focus to something that is scrolled off screen.
+ *
+ * This is more expensive than the default {@link android.view.ViewGroup}
+ * implementation, otherwise this behavior might have been made the default.
+ */
+ @Override
+ protected boolean onRequestFocusInDescendants(int direction,
+ Rect previouslyFocusedRect) {
+
+ // convert from forward / backward notation to up / down / left / right
+ // (ugh).
+ if (direction == View.FOCUS_FORWARD) {
+ direction = View.FOCUS_RIGHT;
+ } else if (direction == View.FOCUS_BACKWARD) {
+ direction = View.FOCUS_LEFT;
+ }
+
+ final View nextFocus = previouslyFocusedRect == null ?
+ FocusFinder.getInstance().findNextFocus(this, null, direction) :
+ FocusFinder.getInstance().findNextFocusFromRect(this,
+ previouslyFocusedRect, direction);
+
+ if (nextFocus == null) {
+ return false;
+ }
+
+ if (isOffScreen(nextFocus)) {
+ return false;
+ }
+
+ return nextFocus.requestFocus(direction, previouslyFocusedRect);
+ }
+
+ @Override
+ public boolean requestChildRectangleOnScreen(View child, Rect rectangle,
+ boolean immediate) {
+ // offset into coordinate space of this scroll view
+ rectangle.offset(child.getLeft() - child.getScrollX(),
+ child.getTop() - child.getScrollY());
+
+ return scrollToChildRect(rectangle, immediate);
+ }
+
+ @Override
+ public void requestLayout() {
+ mIsLayoutDirty = true;
+ super.requestLayout();
+ }
+
+ @Override
+ protected void onLayout(boolean changed, int l, int t, int r, int b) {
+ super.onLayout(changed, l, t, r, b);
+ mIsLayoutDirty = false;
+ // Give a child focus if it needs it
+ if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) {
+ scrollToChild(mChildToScrollTo);
+ }
+ mChildToScrollTo = null;
+
+ // Calling this with the present values causes it to re-claim them
+ scrollTo(mScrollX, mScrollY);
+ }
+
+ @Override
+ protected void onSizeChanged(int w, int h, int oldw, int oldh) {
+ super.onSizeChanged(w, h, oldw, oldh);
+
+ View currentFocused = findFocus();
+ if (null == currentFocused || this == currentFocused)
+ return;
+
+ final int maxJump = mRight - mLeft;
+
+ if (isWithinDeltaOfScreen(currentFocused, maxJump)) {
+ currentFocused.getDrawingRect(mTempRect);
+ offsetDescendantRectToMyCoords(currentFocused, mTempRect);
+ int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
+ doScrollX(scrollDelta);
+ }
+ }
+
+ /**
+ * Return true if child is a descendant of parent, (or equal to the parent).
+ */
+ private static boolean isViewDescendantOf(View child, View parent) {
+ if (child == parent) {
+ return true;
+ }
+
+ final ViewParent theParent = child.getParent();
+ return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent);
+ }
+
+ /**
+ * Fling the scroll view
+ *
+ * @param velocityX The initial velocity in the X direction. Positive
+ * numbers mean that the finger/cursor is moving down the screen,
+ * which means we want to scroll towards the left.
+ */
+ public void fling(int velocityX) {
+ if (getChildCount() > 0) {
+ int width = getWidth() - mPaddingRight - mPaddingLeft;
+ int right = getChildAt(0).getWidth();
+
+ mScroller.fling(mScrollX, mScrollY, velocityX, 0, 0,
+ Math.max(0, right - width), 0, 0, width/2, 0);
+
+ final boolean movingRight = velocityX > 0;
+
+ View currentFocused = findFocus();
+ View newFocused = findFocusableViewInMyBounds(movingRight,
+ mScroller.getFinalX(), currentFocused);
+
+ if (newFocused == null) {
+ newFocused = this;
+ }
+
+ if (newFocused != currentFocused) {
+ newFocused.requestFocus(movingRight ? View.FOCUS_RIGHT : View.FOCUS_LEFT);
+ }
+
+ postInvalidateOnAnimation();
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ *
+ * <p>This version also clamps the scrolling to the bounds of our child.
+ */
+ @Override
+ public void scrollTo(int x, int y) {
+ // we rely on the fact the View.scrollBy calls scrollTo.
+ if (getChildCount() > 0) {
+ View child = getChildAt(0);
+ x = clamp(x, getWidth() - mPaddingRight - mPaddingLeft, child.getWidth());
+ y = clamp(y, getHeight() - mPaddingBottom - mPaddingTop, child.getHeight());
+ if (x != mScrollX || y != mScrollY) {
+ super.scrollTo(x, y);
+ }
+ }
+ }
+
+ @Override
+ public void setOverScrollMode(int mode) {
+ if (mode != OVER_SCROLL_NEVER) {
+ if (mEdgeGlowLeft == null) {
+ Context context = getContext();
+ mEdgeGlowLeft = new EdgeEffect(context);
+ mEdgeGlowRight = new EdgeEffect(context);
+ }
+ } else {
+ mEdgeGlowLeft = null;
+ mEdgeGlowRight = null;
+ }
+ super.setOverScrollMode(mode);
+ }
+
+ @SuppressWarnings({"SuspiciousNameCombination"})
+ @Override
+ public void draw(Canvas canvas) {
+ super.draw(canvas);
+ if (mEdgeGlowLeft != null) {
+ final int scrollX = mScrollX;
+ if (!mEdgeGlowLeft.isFinished()) {
+ final int restoreCount = canvas.save();
+ final int height = getHeight() - mPaddingTop - mPaddingBottom;
+
+ canvas.rotate(270);
+ canvas.translate(-height + mPaddingTop, Math.min(0, scrollX));
+ mEdgeGlowLeft.setSize(height, getWidth());
+ if (mEdgeGlowLeft.draw(canvas)) {
+ postInvalidateOnAnimation();
+ }
+ canvas.restoreToCount(restoreCount);
+ }
+ if (!mEdgeGlowRight.isFinished()) {
+ final int restoreCount = canvas.save();
+ final int width = getWidth();
+ final int height = getHeight() - mPaddingTop - mPaddingBottom;
+
+ canvas.rotate(90);
+ canvas.translate(-mPaddingTop,
+ -(Math.max(getScrollRange(), scrollX) + width));
+ mEdgeGlowRight.setSize(height, width);
+ if (mEdgeGlowRight.draw(canvas)) {
+ postInvalidateOnAnimation();
+ }
+ canvas.restoreToCount(restoreCount);
+ }
+ }
+ }
+
+ private static int clamp(int n, int my, int child) {
+ if (my >= child || n < 0) {
+ return 0;
+ }
+ if ((my + n) > child) {
+ return child - my;
+ }
+ return n;
+ }
+}
diff --git a/src/com/android/videoeditor/widgets/TimelineHorizontalScrollView.java b/src/com/android/videoeditor/widgets/TimelineHorizontalScrollView.java
index 2d93b3e..b3d1414 100755
--- a/src/com/android/videoeditor/widgets/TimelineHorizontalScrollView.java
+++ b/src/com/android/videoeditor/widgets/TimelineHorizontalScrollView.java
@@ -32,7 +32,6 @@
import android.view.Display;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
-import android.widget.HorizontalScrollView;
/**
* The timeline scroll view
