Test Gallery layout direction. (3d0124f1) · Commits · e / os / android_frameworks_base

core/java/android/widget/Gallery.java

+133 −50

Original line number	Diff line number	Diff line
		@@ -16,28 +16,28 @@

		package android.widget;

		import com.android.internal.R;

		import android.annotation.Widget;
		import android.content.Context;
		import android.content.res.TypedArray;
		import android.graphics.Rect;
		import android.util.AttributeSet;
		import android.util.Log;
		import android.view.ContextMenu.ContextMenuInfo;
		import android.view.GestureDetector;
		import android.view.Gravity;
		import android.view.HapticFeedbackConstants;
		import android.view.KeyEvent;
		import android.view.MotionEvent;
		import android.view.SoundEffectConstants;
		import android.view.View;
		import android.view.ViewConfiguration;
		import android.view.ViewGroup;
		import android.view.SoundEffectConstants;
		import android.view.ContextMenu.ContextMenuInfo;
		import android.view.accessibility.AccessibilityEvent;
		import android.view.accessibility.AccessibilityNodeInfo;
		import android.view.animation.Transformation;

		import com.android.internal.R;

		/**
		* A view that shows items in a center-locked, horizontally scrolling list.
		* <p>
		@@ -122,6 +122,7 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		* in the future. It will also trigger a selection changed.
		*/
		private Runnable mDisableSuppressSelectionChangedRunnable = new Runnable() {
		@Override
		public void run() {
		mSuppressSelectionChanged = false;
		selectionChanged();
		@@ -172,6 +173,12 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		*/
		private boolean mIsFirstScroll;

		/**
		* If true, mFirstPosition is the position of the rightmost child, and
		* the children are ordered right to left.
		*/
		private boolean mIsRtl = true;

		public Gallery(Context context) {
		this(context, null);
		}
		@@ -418,7 +425,7 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		}

		int getLimitedMotionScrollAmount(boolean motionToLeft, int deltaX) {
		int extremeItemPosition = motionToLeft ? mItemCount - 1 : 0;
		int extremeItemPosition = motionToLeft != mIsRtl ? mItemCount - 1 : 0;
		View extremeChild = getChildAt(extremeItemPosition - mFirstPosition);

		if (extremeChild == null) {
		@@ -490,31 +497,40 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		if (toLeft) {
		final int galleryLeft = mPaddingLeft;
		for (int i = 0; i < numChildren; i++) {
		final View child = getChildAt(i);
		int n = mIsRtl ? (numChildren - 1 - i) : i;
		final View child = getChildAt(n);
		if (child.getRight() >= galleryLeft) {
		break;
		} else {
		start = n;
		count++;
		mRecycler.put(firstPosition + i, child);
		mRecycler.put(firstPosition + n, child);
		}
		}
		if (!mIsRtl) {
		start = 0;
		}
		} else {
		final int galleryRight = getWidth() - mPaddingRight;
		for (int i = numChildren - 1; i >= 0; i--) {
		final View child = getChildAt(i);
		int n = mIsRtl ? numChildren - 1 - i : i;
		final View child = getChildAt(n);
		if (child.getLeft() <= galleryRight) {
		break;
		} else {
		start = i;
		start = n;
		count++;
		mRecycler.put(firstPosition + i, child);
		mRecycler.put(firstPosition + n, child);
		}
		}
		if (mIsRtl) {
		start = 0;
		}
		}

		detachViewsFromParent(start, count);

		if (toLeft) {
		if (toLeft != mIsRtl) {
		mFirstPosition += count;
		}
		}
		@@ -614,6 +630,8 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		@Override
		void layout(int delta, boolean animate) {

		mIsRtl = isLayoutRtl();

		int childrenLeft = mSpinnerPadding.left;
		int childrenWidth = mRight - mLeft - mSpinnerPadding.left - mSpinnerPadding.right;

		@@ -676,6 +694,45 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		}

		private void fillToGalleryLeft() {
		if (mIsRtl) {
		fillToGalleryLeftRtl();
		} else {
		fillToGalleryLeftLtr();
		}
		}

		private void fillToGalleryLeftRtl() {
		int itemSpacing = mSpacing;
		int galleryLeft = mPaddingLeft;
		int numChildren = getChildCount();
		int numItems = mItemCount;

		// Set state for initial iteration
		View prevIterationView = getChildAt(numChildren - 1);
		int curPosition;
		int curRightEdge;

		if (prevIterationView != null) {
		curPosition = mFirstPosition + numChildren;
		curRightEdge = prevIterationView.getLeft() - itemSpacing;
		} else {
		// No children available!
		mFirstPosition = curPosition = mItemCount - 1;
		curRightEdge = mRight - mLeft - mPaddingRight;
		mShouldStopFling = true;
		}

		while (curRightEdge > galleryLeft && curPosition < mItemCount) {
		prevIterationView = makeAndAddView(curPosition, curPosition - mSelectedPosition,
		curRightEdge, false);

		// Set state for next iteration
		curRightEdge = prevIterationView.getLeft() - itemSpacing;
		curPosition++;
		}
		}

		private void fillToGalleryLeftLtr() {
		int itemSpacing = mSpacing;
		int galleryLeft = mPaddingLeft;

		@@ -708,6 +765,45 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		}

		private void fillToGalleryRight() {
		if (mIsRtl) {
		fillToGalleryRightRtl();
		} else {
		fillToGalleryRightLtr();
		}
		}

		private void fillToGalleryRightRtl() {
		int itemSpacing = mSpacing;
		int galleryRight = mRight - mLeft - mPaddingRight;

		// Set state for initial iteration
		View prevIterationView = getChildAt(0);
		int curPosition;
		int curLeftEdge;

		if (prevIterationView != null) {
		curPosition = mFirstPosition -1;
		curLeftEdge = prevIterationView.getRight() + itemSpacing;
		} else {
		curPosition = 0;
		curLeftEdge = mPaddingLeft;
		mShouldStopFling = true;
		}

		while (curLeftEdge < galleryRight && curPosition >= 0) {
		prevIterationView = makeAndAddView(curPosition, curPosition - mSelectedPosition,
		curLeftEdge, true);

		// Remember some state
		mFirstPosition = curPosition;

		// Set state for next iteration
		curLeftEdge = prevIterationView.getRight() + itemSpacing;
		curPosition--;
		}
		}

		private void fillToGalleryRightLtr() {
		int itemSpacing = mSpacing;
		int galleryRight = mRight - mLeft - mPaddingRight;
		int numChildren = getChildCount();
		@@ -745,18 +841,16 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		*
		* @param position Position in the gallery for the view to obtain
		* @param offset Offset from the selected position
		* @param x X-coordintate indicating where this view should be placed. This
		* @param x X-coordinate indicating where this view should be placed. This
		* will either be the left or right edge of the view, depending on
		* the fromLeft paramter
		* @param fromLeft Are we posiitoning views based on the left edge? (i.e.,
		* the fromLeft parameter
		* @param fromLeft Are we positioning views based on the left edge? (i.e.,
		* building from left to right)?
		* @return A view that has been added to the gallery
		*/
		private View makeAndAddView(int position, int offset, int x,
		boolean fromLeft) {
		private View makeAndAddView(int position, int offset, int x, boolean fromLeft) {

		View child;

		if (!mDataChanged) {
		child = mRecycler.get(position);
		if (child != null) {
		@@ -786,27 +880,26 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList

		/**
		* Helper for makeAndAddView to set the position of a view and fill out its
		* layout paramters.
		* layout parameters.
		*
		* @param child The view to position
		* @param offset Offset from the selected position
		* @param x X-coordintate indicating where this view should be placed. This
		* @param x X-coordinate indicating where this view should be placed. This
		* will either be the left or right edge of the view, depending on
		* the fromLeft paramter
		* @param fromLeft Are we posiitoning views based on the left edge? (i.e.,
		* the fromLeft parameter
		* @param fromLeft Are we positioning views based on the left edge? (i.e.,
		* building from left to right)?
		*/
		private void setUpChild(View child, int offset, int x, boolean fromLeft) {

		// Respect layout params that are already in the view. Otherwise
		// make some up...
		Gallery.LayoutParams lp = (Gallery.LayoutParams)
		child.getLayoutParams();
		Gallery.LayoutParams lp = (Gallery.LayoutParams) child.getLayoutParams();
		if (lp == null) {
		lp = (Gallery.LayoutParams) generateDefaultLayoutParams();
		}

		addViewInLayout(child, fromLeft ? -1 : 0, lp);
		addViewInLayout(child, fromLeft != mIsRtl ? -1 : 0, lp);

		child.setSelected(offset == 0);

		@@ -883,9 +976,7 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		return retValue;
		}

		/**
		* {@inheritDoc}
		*/
		@Override
		public boolean onSingleTapUp(MotionEvent e) {

		if (mDownTouchPosition >= 0) {
		@@ -905,9 +996,7 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		return false;
		}

		/**
		* {@inheritDoc}
		*/
		@Override
		public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {

		if (!mShouldCallbackDuringFling) {
		@@ -926,9 +1015,7 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		return true;
		}

		/**
		* {@inheritDoc}
		*/
		@Override
		public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {

		if (localLOGV) Log.v(TAG, String.valueOf(e2.getX() - e1.getX()));
		@@ -967,9 +1054,7 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		return true;
		}

		/**
		* {@inheritDoc}
		*/
		@Override
		public boolean onDown(MotionEvent e) {

		// Kill any existing fling/scroll
		@@ -1009,9 +1094,7 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		onUp();
		}

		/**
		* {@inheritDoc}
		*/
		@Override
		public void onLongPress(MotionEvent e) {

		if (mDownTouchPosition < 0) {
		@@ -1025,9 +1108,7 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList

		// Unused methods from GestureDetector.OnGestureListener below

		/**
		* {@inheritDoc}
		*/
		@Override
		public void onShowPress(MotionEvent e) {
		}

		@@ -1164,6 +1245,7 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList

		dispatchPress(mSelectedChild);
		postDelayed(new Runnable() {
		@Override
		public void run() {
		dispatchUnpress();
		}
		@@ -1278,10 +1360,10 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		// Draw the selected child last
		return selectedIndex;
		} else if (i >= selectedIndex) {
		// Move the children to the right of the selected child earlier one
		// Move the children after the selected child earlier one
		return i + 1;
		} else {
		// Keep the children to the left of the selected child the same
		// Keep the children before the selected child the same
		return i;
		}
		}
		@@ -1306,7 +1388,6 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		* Responsible for fling behavior. Use {@link #startUsingVelocity(int)} to
		* initiate a fling. Each frame of the fling is handled in {@link #run()}.
		* A FlingRunnable will keep re-posting itself until the fling is done.
		*
		*/
		private class FlingRunnable implements Runnable {
		/**
		@@ -1365,6 +1446,7 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		if (scrollIntoSlots) scrollIntoSlots();
		}

		@Override
		public void run() {

		if (mItemCount == 0) {
		@@ -1384,15 +1466,17 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList

		// Pretend that each frame of a fling scroll is a touch scroll
		if (delta > 0) {
		// Moving towards the left. Use first view as mDownTouchPosition
		mDownTouchPosition = mFirstPosition;
		// Moving towards the left. Use leftmost view as mDownTouchPosition
		mDownTouchPosition = mIsRtl ? (mFirstPosition + getChildCount() - 1) :
		mFirstPosition;

		// Don't fling more than 1 screen
		delta = Math.min(getWidth() - mPaddingLeft - mPaddingRight - 1, delta);
		} else {
		// Moving towards the right. Use last view as mDownTouchPosition
		// Moving towards the right. Use rightmost view as mDownTouchPosition
		int offsetToLast = getChildCount() - 1;
		mDownTouchPosition = mFirstPosition + offsetToLast;
		mDownTouchPosition = mIsRtl ? mFirstPosition :
		(mFirstPosition + getChildCount() - 1);

		// Don't fling more than 1 screen
		delta = Math.max(-(getWidth() - mPaddingRight - mPaddingLeft - 1), delta);
		@@ -1414,7 +1498,6 @@ public class Gallery extends AbsSpinner implements GestureDetector.OnGestureList
		* Gallery extends LayoutParams to provide a place to hold current
		* Transformation information along with previous position/transformation
		* info.
		*
		*/
		public static class LayoutParams extends ViewGroup.LayoutParams {
		public LayoutParams(Context c, AttributeSet attrs) {

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