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@@ -0,0 +1,1110 @@
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+package com.unnamed.b.atv.view;
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+
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+
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+import android.content.Context;
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+import android.graphics.Rect;
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+import android.util.AttributeSet;
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+import android.view.FocusFinder;
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+import android.view.KeyEvent;
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+import android.view.MotionEvent;
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+import android.view.VelocityTracker;
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+import android.view.View;
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+import android.view.ViewConfiguration;
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+import android.view.ViewGroup;
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+import android.view.ViewParent;
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+import android.view.animation.AnimationUtils;
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+import android.widget.FrameLayout;
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+import android.widget.LinearLayout;
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+import android.widget.Scroller;
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+import android.widget.TextView;
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+
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+import java.util.List;
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+
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+/**
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+ * Layout container for a view hierarchy that can be scrolled by the user,
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+ * allowing it to be larger than the physical display. A TwoDScrollView
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+ * is a {@link FrameLayout}, meaning you should place one child in it
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+ * containing the entire contents to scroll; this child may itself be a layout
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+ * manager with a complex hierarchy of objects. A child that is often used
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+ * is a {@link LinearLayout} in a vertical orientation, presenting a vertical
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+ * array of top-level items that the user can scroll through.
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+ * <p/>
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+ * <p>The {@link TextView} class also
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+ * takes care of its own scrolling, so does not require a TwoDScrollView, but
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+ * using the two together is possible to achieve the effect of a text view
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+ * within a larger container.
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+ */
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+public class TwoDScrollView extends FrameLayout {
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+ static final int ANIMATED_SCROLL_GAP = 250;
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+ static final float MAX_SCROLL_FACTOR = 0.5f;
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+
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+ private long mLastScroll;
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+
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+ private final Rect mTempRect = new Rect();
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+ private Scroller mScroller;
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+
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+ /**
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+ * Flag to indicate that we are moving focus ourselves. This is so the
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+ * code that watches for focus changes initiated outside this TwoDScrollView
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+ * knows that it does not have to do anything.
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+ */
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+ private boolean mTwoDScrollViewMovedFocus;
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+
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+ /**
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+ * Position of the last motion event.
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+ */
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+ private float mLastMotionY;
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+ private float mLastMotionX;
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+
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+ /**
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+ * True when the layout has changed but the traversal has not come through yet.
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+ * Ideally the view hierarchy would keep track of this for us.
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+ */
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+ private boolean mIsLayoutDirty = true;
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+
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+ /**
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+ * The child to give focus to in the event that a child has requested focus while the
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+ * layout is dirty. This prevents the scroll from being wrong if the child has not been
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+ * laid out before requesting focus.
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+ */
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+ private View mChildToScrollTo = null;
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+
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+ /**
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+ * True if the user is currently dragging this TwoDScrollView around. This is
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+ * not the same as 'is being flinged', which can be checked by
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+ * mScroller.isFinished() (flinging begins when the user lifts his finger).
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+ */
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+ private boolean mIsBeingDragged = false;
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+
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+ /**
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+ * Determines speed during touch scrolling
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+ */
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+ private VelocityTracker mVelocityTracker;
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+
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+ /**
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+ * Whether arrow scrolling is animated.
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+ */
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+ private int mTouchSlop;
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+ private int mMinimumVelocity;
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+ private int mMaximumVelocity;
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+
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+ public TwoDScrollView(Context context) {
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+ super(context);
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+ initTwoDScrollView();
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+ }
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+
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+ public TwoDScrollView(Context context, AttributeSet attrs) {
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+ super(context, attrs);
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+ initTwoDScrollView();
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+ }
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+
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+ public TwoDScrollView(Context context, AttributeSet attrs, int defStyle) {
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+ super(context, attrs, defStyle);
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+ initTwoDScrollView();
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+ }
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+
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+ @Override
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+ protected float getTopFadingEdgeStrength() {
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+ if (getChildCount() == 0) {
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+ return 0.0f;
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+ }
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+ final int length = getVerticalFadingEdgeLength();
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+ if (getScrollY() < length) {
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+ return getScrollY() / (float) length;
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+ }
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+ return 1.0f;
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+ }
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+
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+ @Override
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+ protected float getBottomFadingEdgeStrength() {
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+ if (getChildCount() == 0) {
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+ return 0.0f;
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+ }
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+ final int length = getVerticalFadingEdgeLength();
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+ final int bottomEdge = getHeight() - getPaddingBottom();
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+ final int span = getChildAt(0).getBottom() - getScrollY() - bottomEdge;
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+ if (span < length) {
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+ return span / (float) length;
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+ }
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+ return 1.0f;
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+ }
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+
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+ @Override
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+ protected float getLeftFadingEdgeStrength() {
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+ if (getChildCount() == 0) {
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+ return 0.0f;
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+ }
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+ final int length = getHorizontalFadingEdgeLength();
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+ if (getScrollX() < length) {
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+ return getScrollX() / (float) length;
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+ }
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+ return 1.0f;
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+ }
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+
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+ @Override
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+ protected float getRightFadingEdgeStrength() {
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+ if (getChildCount() == 0) {
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+ return 0.0f;
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+ }
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+ final int length = getHorizontalFadingEdgeLength();
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+ final int rightEdge = getWidth() - getPaddingRight();
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+ final int span = getChildAt(0).getRight() - getScrollX() - rightEdge;
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+ if (span < length) {
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+ return span / (float) length;
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+ }
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+ return 1.0f;
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+ }
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+
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+ /**
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+ * @return The maximum amount this scroll view will scroll in response to
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+ * an arrow event.
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+ */
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+ public int getMaxScrollAmountVertical() {
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+ return (int) (MAX_SCROLL_FACTOR * getHeight());
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+ }
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+
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+ public int getMaxScrollAmountHorizontal() {
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+ return (int) (MAX_SCROLL_FACTOR * getWidth());
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+ }
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+
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+ private void initTwoDScrollView() {
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+ mScroller = new Scroller(getContext());
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+ setFocusable(true);
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+ setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
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+ setWillNotDraw(false);
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+ final ViewConfiguration configuration = ViewConfiguration.get(getContext());
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+ mTouchSlop = configuration.getScaledTouchSlop();
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+ mMinimumVelocity = configuration.getScaledMinimumFlingVelocity();
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+ mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
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+ }
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+
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+ @Override
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+ public void addView(View child) {
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+ if (getChildCount() > 0) {
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+ throw new IllegalStateException("TwoDScrollView can host only one direct child");
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+ }
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+ super.addView(child);
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+ }
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+
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+ @Override
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+ public void addView(View child, int index) {
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+ if (getChildCount() > 0) {
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+ throw new IllegalStateException("TwoDScrollView can host only one direct child");
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+ }
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+ super.addView(child, index);
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+ }
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+
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+ @Override
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+ public void addView(View child, ViewGroup.LayoutParams params) {
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+ if (getChildCount() > 0) {
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+ throw new IllegalStateException("TwoDScrollView can host only one direct child");
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+ }
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+ super.addView(child, params);
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+ }
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+
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+ @Override
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+ public void addView(View child, int index, ViewGroup.LayoutParams params) {
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+ if (getChildCount() > 0) {
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+ throw new IllegalStateException("TwoDScrollView can host only one direct child");
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+ }
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+ super.addView(child, index, params);
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+ }
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+
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+ /**
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+ * @return Returns true this TwoDScrollView can be scrolled
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+ */
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+ private boolean canScroll() {
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+ View child = getChildAt(0);
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+ if (child != null) {
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+ int childHeight = child.getHeight();
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+ int childWidth = child.getWidth();
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+ return (getHeight() < childHeight + getPaddingTop() + getPaddingBottom()) ||
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+ (getWidth() < childWidth + getPaddingLeft() + getPaddingRight());
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+ }
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+ return false;
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+ }
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+
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+ @Override
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+ public boolean dispatchKeyEvent(KeyEvent event) {
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+ // Let the focused view and/or our descendants get the key first
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+ boolean handled = super.dispatchKeyEvent(event);
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+ if (handled) {
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+ return true;
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+ }
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+ return executeKeyEvent(event);
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+ }
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+
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+ /**
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+ * You can call this function yourself to have the scroll view perform
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+ * scrolling from a key event, just as if the event had been dispatched to
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+ * it by the view hierarchy.
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+ *
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+ * @param event The key event to execute.
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+ * @return Return true if the event was handled, else false.
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+ */
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+ public boolean executeKeyEvent(KeyEvent event) {
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+ mTempRect.setEmpty();
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+ if (!canScroll()) {
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+ if (isFocused()) {
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+ View currentFocused = findFocus();
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+ if (currentFocused == this) currentFocused = null;
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+ View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, View.FOCUS_DOWN);
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+ return nextFocused != null && nextFocused != this && nextFocused.requestFocus(View.FOCUS_DOWN);
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+ }
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+ return false;
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+ }
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+ boolean handled = false;
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+ if (event.getAction() == KeyEvent.ACTION_DOWN) {
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+ switch (event.getKeyCode()) {
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+ case KeyEvent.KEYCODE_DPAD_UP:
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+ if (!event.isAltPressed()) {
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+ handled = arrowScroll(View.FOCUS_UP, false);
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+ } else {
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+ handled = fullScroll(View.FOCUS_UP, false);
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+ }
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+ break;
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+ case KeyEvent.KEYCODE_DPAD_DOWN:
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+ if (!event.isAltPressed()) {
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+ handled = arrowScroll(View.FOCUS_DOWN, false);
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+ } else {
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+ handled = fullScroll(View.FOCUS_DOWN, false);
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+ }
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+ break;
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+ case KeyEvent.KEYCODE_DPAD_LEFT:
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+ if (!event.isAltPressed()) {
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+ handled = arrowScroll(View.FOCUS_LEFT, true);
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+ } else {
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+ handled = fullScroll(View.FOCUS_LEFT, true);
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+ }
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+ break;
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+ case KeyEvent.KEYCODE_DPAD_RIGHT:
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+ if (!event.isAltPressed()) {
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+ handled = arrowScroll(View.FOCUS_RIGHT, true);
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+ } else {
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+ handled = fullScroll(View.FOCUS_RIGHT, true);
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+ }
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+ break;
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+ }
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+ }
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+ return handled;
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+ }
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+
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+ @Override
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+ public boolean onInterceptTouchEvent(MotionEvent ev) {
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+ /*
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+ * This method JUST determines whether we want to intercept the motion.
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+ * If we return true, onMotionEvent will be called and we do the actual
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+ * scrolling there.
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+ *
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+ * Shortcut the most recurring case: the user is in the dragging
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+ * state and he is moving his finger. We want to intercept this
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+ * motion.
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+ */
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+ final int action = ev.getAction();
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+ if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) {
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+ return true;
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+ }
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+ if (!canScroll()) {
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+ mIsBeingDragged = false;
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+ return false;
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+ }
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+ final float y = ev.getY();
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+ final float x = ev.getX();
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+ switch (action) {
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+ case MotionEvent.ACTION_MOVE:
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+ /*
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+ * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
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+ * whether the user has moved far enough from his original down touch.
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+ */
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+ /*
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+ * Locally do absolute value. mLastMotionY is set to the y value
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+ * of the down event.
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+ */
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+ final int yDiff = (int) Math.abs(y - mLastMotionY);
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+ final int xDiff = (int) Math.abs(x - mLastMotionX);
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+ if (yDiff > mTouchSlop || xDiff > mTouchSlop) {
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+ mIsBeingDragged = true;
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+ }
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+ break;
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+
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+ case MotionEvent.ACTION_DOWN:
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+ /* Remember location of down touch */
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+ mLastMotionY = y;
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+ mLastMotionX = x;
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+
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+ /*
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+ * If being flinged and user touches the screen, initiate drag;
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+ * otherwise don't. mScroller.isFinished should be false when
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+ * being flinged.
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+ */
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+ mIsBeingDragged = !mScroller.isFinished();
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+ break;
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+
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+ case MotionEvent.ACTION_CANCEL:
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+ case MotionEvent.ACTION_UP:
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+ /* Release the drag */
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+ mIsBeingDragged = false;
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+ break;
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+ }
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+
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+ /*
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+ * The only time we want to intercept motion events is if we are in the
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+ * drag mode.
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+ */
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+ return mIsBeingDragged;
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+ }
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+
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+ @Override
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+ public boolean onTouchEvent(MotionEvent ev) {
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+
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+ if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
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+ // Don't handle edge touches immediately -- they may actually belong to one of our
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+ // descendants.
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+ return false;
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+ }
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+
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+ if (!canScroll()) {
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+ return false;
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+ }
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+
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+ if (mVelocityTracker == null) {
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+ mVelocityTracker = VelocityTracker.obtain();
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+ }
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+ mVelocityTracker.addMovement(ev);
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+
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+ final int action = ev.getAction();
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+ final float y = ev.getY();
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+ final float x = ev.getX();
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+
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+ switch (action) {
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+ case MotionEvent.ACTION_DOWN:
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+ /*
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+ * If being flinged and user touches, stop the fling. isFinished
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+ * will be false if being flinged.
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+ */
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+ if (!mScroller.isFinished()) {
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+ mScroller.abortAnimation();
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+ }
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+
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+ // Remember where the motion event started
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+ mLastMotionY = y;
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+ mLastMotionX = x;
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+ break;
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+ case MotionEvent.ACTION_MOVE:
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+ // Scroll to follow the motion event
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+ int deltaX = (int) (mLastMotionX - x);
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+ int deltaY = (int) (mLastMotionY - y);
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+ mLastMotionX = x;
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+ mLastMotionY = y;
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+
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+ if (deltaX < 0) {
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+ if (getScrollX() < 0) {
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+ deltaX = 0;
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+ }
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+ } else if (deltaX > 0) {
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+ final int rightEdge = getWidth() - getPaddingRight();
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+ final int availableToScroll = getChildAt(0).getRight() - getScrollX() - rightEdge;
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+ if (availableToScroll > 0) {
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+ deltaX = Math.min(availableToScroll, deltaX);
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+ } else {
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+ deltaX = 0;
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+ }
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+ }
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+ if (deltaY < 0) {
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+ if (getScrollY() < 0) {
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+ deltaY = 0;
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+ }
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+ } else if (deltaY > 0) {
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+ final int bottomEdge = getHeight() - getPaddingBottom();
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+ final int availableToScroll = getChildAt(0).getBottom() - getScrollY() - bottomEdge;
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+ if (availableToScroll > 0) {
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+ deltaY = Math.min(availableToScroll, deltaY);
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+ } else {
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+ deltaY = 0;
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+ }
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+ }
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+ if (deltaY != 0 || deltaX != 0)
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+ scrollBy(deltaX, deltaY);
|
|
|
+ break;
|
|
|
+ case MotionEvent.ACTION_UP:
|
|
|
+ final VelocityTracker velocityTracker = mVelocityTracker;
|
|
|
+ velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
|
|
|
+ int initialXVelocity = (int) velocityTracker.getXVelocity();
|
|
|
+ int initialYVelocity = (int) velocityTracker.getYVelocity();
|
|
|
+ if ((Math.abs(initialXVelocity) + Math.abs(initialYVelocity) > mMinimumVelocity) && getChildCount() > 0) {
|
|
|
+ fling(-initialXVelocity, -initialYVelocity);
|
|
|
+ }
|
|
|
+ if (mVelocityTracker != null) {
|
|
|
+ mVelocityTracker.recycle();
|
|
|
+ mVelocityTracker = null;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Finds the next focusable component that fits in this View's bounds
|
|
|
+ * (excluding fading edges) pretending that this View's top is located at
|
|
|
+ * the parameter top.
|
|
|
+ *
|
|
|
+ * @param topFocus look for a candidate is the one at the top of the bounds
|
|
|
+ * if topFocus is true, or at the bottom of the bounds if topFocus is
|
|
|
+ * false
|
|
|
+ * @param top the top 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 topFocus, final int top, 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 verticalFadingEdgeLength = getVerticalFadingEdgeLength() / 2;
|
|
|
+ final int topWithoutFadingEdge = top + verticalFadingEdgeLength;
|
|
|
+ final int bottomWithoutFadingEdge = top + getHeight() - verticalFadingEdgeLength;
|
|
|
+ final int horizontalFadingEdgeLength = getHorizontalFadingEdgeLength() / 2;
|
|
|
+ final int leftWithoutFadingEdge = left + horizontalFadingEdgeLength;
|
|
|
+ final int rightWithoutFadingEdge = left + getWidth() - horizontalFadingEdgeLength;
|
|
|
+
|
|
|
+ if ((preferredFocusable != null)
|
|
|
+ && (preferredFocusable.getTop() < bottomWithoutFadingEdge)
|
|
|
+ && (preferredFocusable.getBottom() > topWithoutFadingEdge)
|
|
|
+ && (preferredFocusable.getLeft() < rightWithoutFadingEdge)
|
|
|
+ && (preferredFocusable.getRight() > leftWithoutFadingEdge)) {
|
|
|
+ return preferredFocusable;
|
|
|
+ }
|
|
|
+ return findFocusableViewInBounds(topFocus, topWithoutFadingEdge, bottomWithoutFadingEdge, leftFocus, leftWithoutFadingEdge, rightWithoutFadingEdge);
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Finds the next focusable component that fits in the specified bounds.
|
|
|
+ * </p>
|
|
|
+ *
|
|
|
+ * @param topFocus look for a candidate is the one at the top of the bounds
|
|
|
+ * if topFocus is true, or at the bottom of the bounds if topFocus is
|
|
|
+ * false
|
|
|
+ * @param top the top offset of the bounds in which a focusable must be
|
|
|
+ * found
|
|
|
+ * @param bottom the bottom 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 topFocus, int top, int bottom, boolean leftFocus, int left, int right) {
|
|
|
+ List<View> focusables = getFocusables(View.FOCUS_FORWARD);
|
|
|
+ View focusCandidate = null;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * A fully contained focusable is one where its top is below the bound's
|
|
|
+ * top, and its bottom is above the bound's bottom. 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 viewTop = view.getTop();
|
|
|
+ int viewBottom = view.getBottom();
|
|
|
+ int viewLeft = view.getLeft();
|
|
|
+ int viewRight = view.getRight();
|
|
|
+
|
|
|
+ if (top < viewBottom && viewTop < bottom && left < viewRight && viewLeft < right) {
|
|
|
+ /*
|
|
|
+ * the focusable is in the target area, it is a candidate for
|
|
|
+ * focusing
|
|
|
+ */
|
|
|
+ final boolean viewIsFullyContained = (top < viewTop) && (viewBottom < bottom) && (left < viewLeft) && (viewRight < right);
|
|
|
+ if (focusCandidate == null) {
|
|
|
+ /* No candidate, take this one */
|
|
|
+ focusCandidate = view;
|
|
|
+ foundFullyContainedFocusable = viewIsFullyContained;
|
|
|
+ } else {
|
|
|
+ final boolean viewIsCloserToVerticalBoundary =
|
|
|
+ (topFocus && viewTop < focusCandidate.getTop()) ||
|
|
|
+ (!topFocus && viewBottom > focusCandidate.getBottom());
|
|
|
+ final boolean viewIsCloserToHorizontalBoundary =
|
|
|
+ (leftFocus && viewLeft < focusCandidate.getLeft()) ||
|
|
|
+ (!leftFocus && viewRight > focusCandidate.getRight());
|
|
|
+ if (foundFullyContainedFocusable) {
|
|
|
+ if (viewIsFullyContained && viewIsCloserToVerticalBoundary && viewIsCloserToHorizontalBoundary) {
|
|
|
+ /*
|
|
|
+ * 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 (viewIsCloserToVerticalBoundary && viewIsCloserToHorizontalBoundary) {
|
|
|
+ /*
|
|
|
+ * Partially contained view beats another partially
|
|
|
+ * contained view if it's closer
|
|
|
+ */
|
|
|
+ focusCandidate = view;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return focusCandidate;
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * <p>Handles scrolling in response to a "home/end" shortcut press. This
|
|
|
+ * method will scroll the view to the top or bottom and give the focus
|
|
|
+ * to the topmost/bottommost 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_UP}
|
|
|
+ * to go the top of the view or
|
|
|
+ * {@link android.view.View#FOCUS_DOWN} to go the bottom
|
|
|
+ * @return true if the key event is consumed by this method, false otherwise
|
|
|
+ */
|
|
|
+ public boolean fullScroll(int direction, boolean horizontal) {
|
|
|
+ if (!horizontal) {
|
|
|
+ boolean down = direction == View.FOCUS_DOWN;
|
|
|
+ int height = getHeight();
|
|
|
+ mTempRect.top = 0;
|
|
|
+ mTempRect.bottom = height;
|
|
|
+ if (down) {
|
|
|
+ int count = getChildCount();
|
|
|
+ if (count > 0) {
|
|
|
+ View view = getChildAt(count - 1);
|
|
|
+ mTempRect.bottom = view.getBottom();
|
|
|
+ mTempRect.top = mTempRect.bottom - height;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom, 0, 0, 0);
|
|
|
+ } else {
|
|
|
+ boolean right = direction == View.FOCUS_DOWN;
|
|
|
+ int width = getWidth();
|
|
|
+ mTempRect.left = 0;
|
|
|
+ mTempRect.right = width;
|
|
|
+ if (right) {
|
|
|
+ int count = getChildCount();
|
|
|
+ if (count > 0) {
|
|
|
+ View view = getChildAt(count - 1);
|
|
|
+ mTempRect.right = view.getBottom();
|
|
|
+ mTempRect.left = mTempRect.right - width;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return scrollAndFocus(0, 0, 0, direction, mTempRect.top, mTempRect.bottom);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * <p>Scrolls the view to make the area defined by <code>top</code> and
|
|
|
+ * <code>bottom</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_UP}
|
|
|
+ * to go upward
|
|
|
+ * {@link android.view.View#FOCUS_DOWN} to downward
|
|
|
+ * @param top the top offset of the new area to be made visible
|
|
|
+ * @param bottom the bottom 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 directionY, int top, int bottom, int directionX, int left, int right) {
|
|
|
+ boolean handled = true;
|
|
|
+ int height = getHeight();
|
|
|
+ int containerTop = getScrollY();
|
|
|
+ int containerBottom = containerTop + height;
|
|
|
+ boolean up = directionY == View.FOCUS_UP;
|
|
|
+ int width = getWidth();
|
|
|
+ int containerLeft = getScrollX();
|
|
|
+ int containerRight = containerLeft + width;
|
|
|
+ boolean leftwards = directionX == View.FOCUS_UP;
|
|
|
+ View newFocused = findFocusableViewInBounds(up, top, bottom, leftwards, left, right);
|
|
|
+ if (newFocused == null) {
|
|
|
+ newFocused = this;
|
|
|
+ }
|
|
|
+ if ((top >= containerTop && bottom <= containerBottom) || (left >= containerLeft && right <= containerRight)) {
|
|
|
+ handled = false;
|
|
|
+ } else {
|
|
|
+ int deltaY = up ? (top - containerTop) : (bottom - containerBottom);
|
|
|
+ int deltaX = leftwards ? (left - containerLeft) : (right - containerRight);
|
|
|
+ doScroll(deltaX, deltaY);
|
|
|
+ }
|
|
|
+ if (newFocused != findFocus() && newFocused.requestFocus(directionY)) {
|
|
|
+ mTwoDScrollViewMovedFocus = true;
|
|
|
+ mTwoDScrollViewMovedFocus = false;
|
|
|
+ }
|
|
|
+ return handled;
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Handle scrolling in response to an up or down 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, boolean horizontal) {
|
|
|
+ View currentFocused = findFocus();
|
|
|
+ if (currentFocused == this) currentFocused = null;
|
|
|
+ View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction);
|
|
|
+ final int maxJump = horizontal ? getMaxScrollAmountHorizontal() : getMaxScrollAmountVertical();
|
|
|
+
|
|
|
+ if (!horizontal) {
|
|
|
+ if (nextFocused != null) {
|
|
|
+ nextFocused.getDrawingRect(mTempRect);
|
|
|
+ offsetDescendantRectToMyCoords(nextFocused, mTempRect);
|
|
|
+ int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
|
|
|
+ doScroll(0, scrollDelta);
|
|
|
+ nextFocused.requestFocus(direction);
|
|
|
+ } else {
|
|
|
+ // no new focus
|
|
|
+ int scrollDelta = maxJump;
|
|
|
+ if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) {
|
|
|
+ scrollDelta = getScrollY();
|
|
|
+ } else if (direction == View.FOCUS_DOWN) {
|
|
|
+ if (getChildCount() > 0) {
|
|
|
+ int daBottom = getChildAt(0).getBottom();
|
|
|
+ int screenBottom = getScrollY() + getHeight();
|
|
|
+ if (daBottom - screenBottom < maxJump) {
|
|
|
+ scrollDelta = daBottom - screenBottom;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if (scrollDelta == 0) {
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+ doScroll(0, direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta);
|
|
|
+ }
|
|
|
+ } else {
|
|
|
+ if (nextFocused != null) {
|
|
|
+ nextFocused.getDrawingRect(mTempRect);
|
|
|
+ offsetDescendantRectToMyCoords(nextFocused, mTempRect);
|
|
|
+ int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
|
|
|
+ doScroll(scrollDelta, 0);
|
|
|
+ nextFocused.requestFocus(direction);
|
|
|
+ } else {
|
|
|
+ // no new focus
|
|
|
+ int scrollDelta = maxJump;
|
|
|
+ if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) {
|
|
|
+ scrollDelta = getScrollY();
|
|
|
+ } else if (direction == View.FOCUS_DOWN) {
|
|
|
+ if (getChildCount() > 0) {
|
|
|
+ int daBottom = getChildAt(0).getBottom();
|
|
|
+ int screenBottom = getScrollY() + getHeight();
|
|
|
+ if (daBottom - screenBottom < maxJump) {
|
|
|
+ scrollDelta = daBottom - screenBottom;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if (scrollDelta == 0) {
|
|
|
+ return false;
|
|
|
+ }
|
|
|
+ doScroll(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta, 0);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return true;
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Smooth scroll by a Y delta
|
|
|
+ *
|
|
|
+ * @param delta the number of pixels to scroll by on the Y axis
|
|
|
+ */
|
|
|
+ private void doScroll(int deltaX, int deltaY) {
|
|
|
+ if (deltaX != 0 || deltaY != 0) {
|
|
|
+ smoothScrollBy(deltaX, deltaY);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * 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) {
|
|
|
+ long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll;
|
|
|
+ if (duration > ANIMATED_SCROLL_GAP) {
|
|
|
+ mScroller.startScroll(getScrollX(), getScrollY(), dx, dy);
|
|
|
+ awakenScrollBars(mScroller.getDuration());
|
|
|
+ invalidate();
|
|
|
+ } 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 - getScrollX(), y - getScrollY());
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * <p>The scroll range of a scroll view is the overall height of all of its
|
|
|
+ * children.</p>
|
|
|
+ */
|
|
|
+ @Override
|
|
|
+ protected int computeVerticalScrollRange() {
|
|
|
+ int count = getChildCount();
|
|
|
+ return count == 0 ? getHeight() : (getChildAt(0)).getBottom();
|
|
|
+ }
|
|
|
+
|
|
|
+ @Override
|
|
|
+ protected int computeHorizontalScrollRange() {
|
|
|
+ int count = getChildCount();
|
|
|
+ return count == 0 ? getWidth() : (getChildAt(0)).getRight();
|
|
|
+ }
|
|
|
+
|
|
|
+ @Override
|
|
|
+ protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) {
|
|
|
+ ViewGroup.LayoutParams lp = child.getLayoutParams();
|
|
|
+ int childWidthMeasureSpec;
|
|
|
+ int childHeightMeasureSpec;
|
|
|
+
|
|
|
+ childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, getPaddingLeft() + getPaddingRight(), lp.width);
|
|
|
+ childHeightMeasureSpec = 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 childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(lp.leftMargin + lp.rightMargin, MeasureSpec.UNSPECIFIED);
|
|
|
+ final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(lp.topMargin + lp.bottomMargin, 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 = getScrollX();
|
|
|
+ int oldY = getScrollY();
|
|
|
+ int x = mScroller.getCurrX();
|
|
|
+ int y = mScroller.getCurrY();
|
|
|
+ if (getChildCount() > 0) {
|
|
|
+ View child = getChildAt(0);
|
|
|
+ scrollTo(clamp(x, getWidth() - getPaddingRight() - getPaddingLeft(), child.getWidth()),
|
|
|
+ clamp(y, getHeight() - getPaddingBottom() - getPaddingTop(), child.getHeight()));
|
|
|
+ } else {
|
|
|
+ scrollTo(x, y);
|
|
|
+ }
|
|
|
+ if (oldX != getScrollX() || oldY != getScrollY()) {
|
|
|
+ onScrollChanged(getScrollX(), getScrollY(), oldX, oldY);
|
|
|
+ }
|
|
|
+
|
|
|
+ // Keep on drawing until the animation has finished.
|
|
|
+ postInvalidate();
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * 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 TwoDScrollView coordinates */
|
|
|
+ offsetDescendantRectToMyCoords(child, mTempRect);
|
|
|
+ int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
|
|
|
+ if (scrollDelta != 0) {
|
|
|
+ scrollBy(0, scrollDelta);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * 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(0, delta);
|
|
|
+ } else {
|
|
|
+ smoothScrollBy(0, delta);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return scroll;
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Compute the amount to scroll in the Y 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 height = getHeight();
|
|
|
+ int screenTop = getScrollY();
|
|
|
+ int screenBottom = screenTop + height;
|
|
|
+ int fadingEdge = getVerticalFadingEdgeLength();
|
|
|
+ // leave room for top fading edge as long as rect isn't at very top
|
|
|
+ if (rect.top > 0) {
|
|
|
+ screenTop += fadingEdge;
|
|
|
+ }
|
|
|
+
|
|
|
+ // leave room for bottom fading edge as long as rect isn't at very bottom
|
|
|
+ if (rect.bottom < getChildAt(0).getHeight()) {
|
|
|
+ screenBottom -= fadingEdge;
|
|
|
+ }
|
|
|
+ int scrollYDelta = 0;
|
|
|
+ if (rect.bottom > screenBottom && rect.top > screenTop) {
|
|
|
+ // need to move down to get it in view: move down just enough so
|
|
|
+ // that the entire rectangle is in view (or at least the first
|
|
|
+ // screen size chunk).
|
|
|
+ if (rect.height() > height) {
|
|
|
+ // just enough to get screen size chunk on
|
|
|
+ scrollYDelta += (rect.top - screenTop);
|
|
|
+ } else {
|
|
|
+ // get entire rect at bottom of screen
|
|
|
+ scrollYDelta += (rect.bottom - screenBottom);
|
|
|
+ }
|
|
|
+
|
|
|
+ // make sure we aren't scrolling beyond the end of our content
|
|
|
+ int bottom = getChildAt(0).getBottom();
|
|
|
+ int distanceToBottom = bottom - screenBottom;
|
|
|
+ scrollYDelta = Math.min(scrollYDelta, distanceToBottom);
|
|
|
+
|
|
|
+ } else if (rect.top < screenTop && rect.bottom < screenBottom) {
|
|
|
+ // need to move up to get it in view: move up just enough so that
|
|
|
+ // entire rectangle is in view (or at least the first screen
|
|
|
+ // size chunk of it).
|
|
|
+
|
|
|
+ if (rect.height() > height) {
|
|
|
+ // screen size chunk
|
|
|
+ scrollYDelta -= (screenBottom - rect.bottom);
|
|
|
+ } else {
|
|
|
+ // entire rect at top
|
|
|
+ scrollYDelta -= (screenTop - rect.top);
|
|
|
+ }
|
|
|
+
|
|
|
+ // make sure we aren't scrolling any further than the top our content
|
|
|
+ scrollYDelta = Math.max(scrollYDelta, -getScrollY());
|
|
|
+ }
|
|
|
+ return scrollYDelta;
|
|
|
+ }
|
|
|
+
|
|
|
+ @Override
|
|
|
+ public void requestChildFocus(View child, View focused) {
|
|
|
+ if (!mTwoDScrollViewMovedFocus) {
|
|
|
+ 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.
|
|
|
+ * <p/>
|
|
|
+ * 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_DOWN;
|
|
|
+ } else if (direction == View.FOCUS_BACKWARD) {
|
|
|
+ direction = View.FOCUS_UP;
|
|
|
+ }
|
|
|
+
|
|
|
+ final View nextFocus = previouslyFocusedRect == null ?
|
|
|
+ FocusFinder.getInstance().findNextFocus(this, null, direction) :
|
|
|
+ FocusFinder.getInstance().findNextFocusFromRect(this,
|
|
|
+ previouslyFocusedRect, direction);
|
|
|
+
|
|
|
+ if (nextFocus == null) {
|
|
|
+ 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-clam them
|
|
|
+ scrollTo(getScrollX(), getScrollY());
|
|
|
+ }
|
|
|
+
|
|
|
+ @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;
|
|
|
+
|
|
|
+ // If the currently-focused view was visible on the screen when the
|
|
|
+ // screen was at the old height, then scroll the screen to make that
|
|
|
+ // view visible with the new screen height.
|
|
|
+ currentFocused.getDrawingRect(mTempRect);
|
|
|
+ offsetDescendantRectToMyCoords(currentFocused, mTempRect);
|
|
|
+ int scrollDeltaX = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
|
|
|
+ int scrollDeltaY = computeScrollDeltaToGetChildRectOnScreen(mTempRect);
|
|
|
+ doScroll(scrollDeltaX, scrollDeltaY);
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Return true if child is an descendant of parent, (or equal to the parent).
|
|
|
+ */
|
|
|
+ private 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 velocityY The initial velocity in the Y direction. Positive
|
|
|
+ * numbers mean that the finger/curor is moving down the screen,
|
|
|
+ * which means we want to scroll towards the top.
|
|
|
+ */
|
|
|
+ public void fling(int velocityX, int velocityY) {
|
|
|
+ if (getChildCount() > 0) {
|
|
|
+ int height = getHeight() - getPaddingBottom() - getPaddingTop();
|
|
|
+ int bottom = getChildAt(0).getHeight();
|
|
|
+ int width = getWidth() - getPaddingRight() - getPaddingLeft();
|
|
|
+ int right = getChildAt(0).getWidth();
|
|
|
+
|
|
|
+ mScroller.fling(getScrollX(), getScrollY(), velocityX, velocityY, 0, right - width, 0, bottom - height);
|
|
|
+
|
|
|
+ final boolean movingDown = velocityY > 0;
|
|
|
+ final boolean movingRight = velocityX > 0;
|
|
|
+
|
|
|
+ View newFocused = findFocusableViewInMyBounds(movingRight, mScroller.getFinalX(), movingDown, mScroller.getFinalY(), findFocus());
|
|
|
+ if (newFocused == null) {
|
|
|
+ newFocused = this;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (newFocused != findFocus() && newFocused.requestFocus(movingDown ? View.FOCUS_DOWN : View.FOCUS_UP)) {
|
|
|
+ mTwoDScrollViewMovedFocus = true;
|
|
|
+ mTwoDScrollViewMovedFocus = false;
|
|
|
+ }
|
|
|
+
|
|
|
+ awakenScrollBars(mScroller.getDuration());
|
|
|
+ invalidate();
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /**
|
|
|
+ * {@inheritDoc}
|
|
|
+ * <p/>
|
|
|
+ * <p>This version also clamps the scrolling to the bounds of our child.
|
|
|
+ */
|
|
|
+ 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() - getPaddingRight() - getPaddingLeft(), child.getWidth());
|
|
|
+ y = clamp(y, getHeight() - getPaddingBottom() - getPaddingTop(), child.getHeight());
|
|
|
+ if (x != getScrollX() || y != getScrollY()) {
|
|
|
+ super.scrollTo(x, y);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ private int clamp(int n, int my, int child) {
|
|
|
+ if (my >= child || n < 0) {
|
|
|
+ /* my >= child is this case:
|
|
|
+ * |--------------- me ---------------|
|
|
|
+ * |------ child ------|
|
|
|
+ * or
|
|
|
+ * |--------------- me ---------------|
|
|
|
+ * |------ child ------|
|
|
|
+ * or
|
|
|
+ * |--------------- me ---------------|
|
|
|
+ * |------ child ------|
|
|
|
+ *
|
|
|
+ * n < 0 is this case:
|
|
|
+ * |------ me ------|
|
|
|
+ * |-------- child --------|
|
|
|
+ * |-- mScrollX --|
|
|
|
+ */
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ if ((my + n) > child) {
|
|
|
+ /* this case:
|
|
|
+ * |------ me ------|
|
|
|
+ * |------ child ------|
|
|
|
+ * |-- mScrollX --|
|
|
|
+ */
|
|
|
+ return child - my;
|
|
|
+ }
|
|
|
+ return n;
|
|
|
+ }
|
|
|
+}
|
Bitliker
