Make scroll bar mouse draggable. (d85bc507) · Commits · e / os / android_frameworks_base

core/java/android/view/View.java

+259 −59

Original line number	Diff line number	Diff line
		@@ -98,13 +98,13 @@ import android.view.inputmethod.InputMethodManager;
		import android.widget.Checkable;
		import android.widget.FrameLayout;
		import android.widget.ScrollBarDrawable;

		import static android.os.Build.VERSION_CODES.*;
		import static java.lang.Math.max;

		import com.android.internal.R;
		import com.android.internal.util.Predicate;
		import com.android.internal.view.menu.MenuBuilder;
		import com.android.internal.widget.ScrollBarUtils;
		import com.google.android.collect.Lists;
		import com.google.android.collect.Maps;

		@@ -5110,6 +5110,88 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		return mVerticalScrollbarPosition;
		}

		boolean isOnScrollbar(float x, float y) {
		if (mScrollCache == null) {
		return false;
		}
		x += getScrollX();
		y += getScrollY();
		if (isVerticalScrollBarEnabled() && !isVerticalScrollBarHidden()) {
		final Rect bounds = mScrollCache.mScrollBarBounds;
		getVerticalScrollBarBounds(bounds);
		if (bounds.contains((int)x, (int)y)) {
		return true;
		}
		}
		if (isHorizontalScrollBarEnabled()) {
		final Rect bounds = mScrollCache.mScrollBarBounds;
		getHorizontalScrollBarBounds(bounds);
		if (bounds.contains((int)x, (int)y)) {
		return true;
		}
		}
		return false;
		}

		boolean isOnScrollbarThumb(float x, float y) {
		return isOnVerticalScrollbarThumb(x, y) \|\| isOnHorizontalScrollbarThumb(x, y);
		}

		private boolean isOnVerticalScrollbarThumb(float x, float y) {
		if (mScrollCache == null) {
		return false;
		}
		if (isVerticalScrollBarEnabled() && !isVerticalScrollBarHidden()) {
		x += getScrollX();
		y += getScrollY();
		final Rect bounds = mScrollCache.mScrollBarBounds;
		getVerticalScrollBarBounds(bounds);
		final int range = computeVerticalScrollRange();
		final int offset = computeVerticalScrollOffset();
		final int extent = computeVerticalScrollExtent();
		final int thumbLength = ScrollBarUtils.getThumbLength(bounds.height(), bounds.width(),
		extent, range);
		final int thumbOffset = ScrollBarUtils.getThumbOffset(bounds.height(), thumbLength,
		extent, range, offset);
		final int thumbTop = bounds.top + thumbOffset;
		if (x >= bounds.left && x <= bounds.right && y >= thumbTop
		&& y <= thumbTop + thumbLength) {
		return true;
		}
		}
		return false;
		}

		private boolean isOnHorizontalScrollbarThumb(float x, float y) {
		if (mScrollCache == null) {
		return false;
		}
		if (isHorizontalScrollBarEnabled()) {
		x += getScrollX();
		y += getScrollY();
		final Rect bounds = mScrollCache.mScrollBarBounds;
		getHorizontalScrollBarBounds(bounds);
		final int range = computeHorizontalScrollRange();
		final int offset = computeHorizontalScrollOffset();
		final int extent = computeHorizontalScrollExtent();
		final int thumbLength = ScrollBarUtils.getThumbLength(bounds.width(), bounds.height(),
		extent, range);
		final int thumbOffset = ScrollBarUtils.getThumbOffset(bounds.width(), thumbLength,
		extent, range, offset);
		final int thumbLeft = bounds.left + thumbOffset;
		if (x >= thumbLeft && x <= thumbLeft + thumbLength && y >= bounds.top
		&& y <= bounds.bottom) {
		return true;
		}
		}
		return false;
		}

		boolean isDraggingScrollBar() {
		return mScrollCache != null
		&& mScrollCache.mScrollBarDraggingState != ScrollabilityCache.NOT_DRAGGING;
		}

		/**
		* Sets the state of all scroll indicators.
		* <p>
		@@ -9586,6 +9668,9 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		}

		if (onFilterTouchEventForSecurity(event)) {
		if ((mViewFlags & ENABLED_MASK) == ENABLED && handleScrollBarDragging(event)) {
		result = true;
		}
		//noinspection SimplifiableIfStatement
		ListenerInfo li = mListenerInfo;
		if (li != null && li.mOnTouchListener != null
		@@ -10450,6 +10535,11 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		}
		}

		if ((action == MotionEvent.ACTION_HOVER_ENTER \|\| action == MotionEvent.ACTION_HOVER_MOVE)
		&& event.isFromSource(InputDevice.SOURCE_MOUSE)
		&& isOnScrollbar(event.getX(), event.getY())) {
		awakenScrollBars();
		}
		if (isHoverable()) {
		switch (action) {
		case MotionEvent.ACTION_HOVER_ENTER:
		@@ -10552,6 +10642,110 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		public void onHoverChanged(boolean hovered) {
		}

		/**
		* Handles scroll bar dragging by mouse input.
		*
		* @hide
		* @param event The motion event.
		*
		* @return true if the event was handled as a scroll bar dragging, false otherwise.
		*/
		protected boolean handleScrollBarDragging(MotionEvent event) {
		if (mScrollCache == null) {
		return false;
		}
		final float x = event.getX();
		final float y = event.getY();
		final int action = event.getAction();
		if ((mScrollCache.mScrollBarDraggingState == ScrollabilityCache.NOT_DRAGGING
		&& action != MotionEvent.ACTION_DOWN)
		\|\| !event.isFromSource(InputDevice.SOURCE_MOUSE)
		\|\| !event.isButtonPressed(MotionEvent.BUTTON_PRIMARY)) {
		mScrollCache.mScrollBarDraggingState = ScrollabilityCache.NOT_DRAGGING;
		return false;
		}

		switch (action) {
		case MotionEvent.ACTION_MOVE:
		if (mScrollCache.mScrollBarDraggingState == ScrollabilityCache.NOT_DRAGGING) {
		return false;
		}
		if (mScrollCache.mScrollBarDraggingState
		== ScrollabilityCache.DRAGGING_VERTICAL_SCROLL_BAR) {
		final Rect bounds = mScrollCache.mScrollBarBounds;
		getVerticalScrollBarBounds(bounds);
		final int range = computeVerticalScrollRange();
		final int offset = computeVerticalScrollOffset();
		final int extent = computeVerticalScrollExtent();

		final int thumbLength = ScrollBarUtils.getThumbLength(
		bounds.height(), bounds.width(), extent, range);
		final int thumbOffset = ScrollBarUtils.getThumbOffset(
		bounds.height(), thumbLength, extent, range, offset);

		final float diff = y - mScrollCache.mScrollBarDraggingPos;
		final float maxThumbOffset = bounds.height() - thumbLength;
		final float newThumbOffset =
		Math.min(Math.max(thumbOffset + diff, 0.0f), maxThumbOffset);
		final int height = getHeight();
		if (Math.round(newThumbOffset) != thumbOffset && maxThumbOffset > 0
		&& height > 0 && extent > 0) {
		final int newY = Math.round((range - extent)
		/ ((float)extent / height) * (newThumbOffset / maxThumbOffset));
		if (newY != getScrollY()) {
		mScrollCache.mScrollBarDraggingPos = y;
		setScrollY(newY);
		}
		}
		return true;
		}
		if (mScrollCache.mScrollBarDraggingState
		== ScrollabilityCache.DRAGGING_HORIZONTAL_SCROLL_BAR) {
		final Rect bounds = mScrollCache.mScrollBarBounds;
		getHorizontalScrollBarBounds(bounds);
		final int range = computeHorizontalScrollRange();
		final int offset = computeHorizontalScrollOffset();
		final int extent = computeHorizontalScrollExtent();

		final int thumbLength = ScrollBarUtils.getThumbLength(
		bounds.width(), bounds.height(), extent, range);
		final int thumbOffset = ScrollBarUtils.getThumbOffset(
		bounds.width(), thumbLength, extent, range, offset);

		final float diff = x - mScrollCache.mScrollBarDraggingPos;
		final float maxThumbOffset = bounds.width() - thumbLength;
		final float newThumbOffset =
		Math.min(Math.max(thumbOffset + diff, 0.0f), maxThumbOffset);
		final int width = getWidth();
		if (Math.round(newThumbOffset) != thumbOffset && maxThumbOffset > 0
		&& width > 0 && extent > 0) {
		final int newX = Math.round((range - extent)
		/ ((float)extent / width) * (newThumbOffset / maxThumbOffset));
		if (newX != getScrollX()) {
		mScrollCache.mScrollBarDraggingPos = x;
		setScrollX(newX);
		}
		}
		return true;
		}
		case MotionEvent.ACTION_DOWN:
		if (isOnVerticalScrollbarThumb(x, y)) {
		mScrollCache.mScrollBarDraggingState =
		ScrollabilityCache.DRAGGING_VERTICAL_SCROLL_BAR;
		mScrollCache.mScrollBarDraggingPos = y;
		return true;
		}
		if (isOnHorizontalScrollbarThumb(x, y)) {
		mScrollCache.mScrollBarDraggingState =
		ScrollabilityCache.DRAGGING_HORIZONTAL_SCROLL_BAR;
		mScrollCache.mScrollBarDraggingPos = x;
		return true;
		}
		}
		mScrollCache.mScrollBarDraggingState = ScrollabilityCache.NOT_DRAGGING;
		return false;
		}

		/**
		* Implement this method to handle touch screen motion events.
		* <p>
		@@ -10585,7 +10779,6 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		\|\| (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)
		\|\| (viewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE);
		}

		if (mTouchDelegate != null) {
		if (mTouchDelegate.onTouchEvent(event)) {
		return true;
		@@ -14146,6 +14339,45 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		}
		}

		private void getHorizontalScrollBarBounds(Rect bounds) {
		final int inside = (mViewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;
		final boolean drawVerticalScrollBar = isVerticalScrollBarEnabled()
		&& !isVerticalScrollBarHidden();
		final int size = getHorizontalScrollbarHeight();
		final int verticalScrollBarGap = drawVerticalScrollBar ?
		getVerticalScrollbarWidth() : 0;
		final int width = mRight - mLeft;
		final int height = mBottom - mTop;
		bounds.top = mScrollY + height - size - (mUserPaddingBottom & inside);
		bounds.left = mScrollX + (mPaddingLeft & inside);
		bounds.right = mScrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap;
		bounds.bottom = bounds.top + size;
		}

		private void getVerticalScrollBarBounds(Rect bounds) {
		final int inside = (mViewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;
		final int size = getVerticalScrollbarWidth();
		int verticalScrollbarPosition = mVerticalScrollbarPosition;
		if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) {
		verticalScrollbarPosition = isLayoutRtl() ?
		SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT;
		}
		final int width = mRight - mLeft;
		final int height = mBottom - mTop;
		switch (verticalScrollbarPosition) {
		default:
		case SCROLLBAR_POSITION_RIGHT:
		bounds.left = mScrollX + width - size - (mUserPaddingRight & inside);
		break;
		case SCROLLBAR_POSITION_LEFT:
		bounds.left = mScrollX + (mUserPaddingLeft & inside);
		break;
		}
		bounds.top = mScrollY + (mPaddingTop & inside);
		bounds.right = bounds.left + size;
		bounds.bottom = mScrollY + height - (mUserPaddingBottom & inside);
		}

		/**
		* <p>Request the drawing of the horizontal and the vertical scrollbar. The
		* scrollbars are painted only if they have been awakened first.</p>
		@@ -14193,80 +14425,36 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		cache.scrollBar.mutate().setAlpha(255);
		}


		final int viewFlags = mViewFlags;

		final boolean drawHorizontalScrollBar =
		(viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL;
		final boolean drawVerticalScrollBar =
		(viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL
		final boolean drawHorizontalScrollBar = isHorizontalScrollBarEnabled();
		final boolean drawVerticalScrollBar = isVerticalScrollBarEnabled()
		&& !isVerticalScrollBarHidden();

		if (drawVerticalScrollBar \|\| drawHorizontalScrollBar) {
		final int width = mRight - mLeft;
		final int height = mBottom - mTop;

		final ScrollBarDrawable scrollBar = cache.scrollBar;

		final int scrollX = mScrollX;
		final int scrollY = mScrollY;
		final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0;

		int left;
		int top;
		int right;
		int bottom;

		if (drawHorizontalScrollBar) {
		int size = scrollBar.getSize(false);
		if (size <= 0) {
		size = cache.scrollBarSize;
		}

		scrollBar.setParameters(computeHorizontalScrollRange(),
		computeHorizontalScrollOffset(),
		computeHorizontalScrollExtent(), false);
		final int verticalScrollBarGap = drawVerticalScrollBar ?
		getVerticalScrollbarWidth() : 0;
		top = scrollY + height - size - (mUserPaddingBottom & inside);
		left = scrollX + (mPaddingLeft & inside);
		right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap;
		bottom = top + size;
		onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom);
		final Rect bounds = cache.mScrollBarBounds;
		getHorizontalScrollBarBounds(bounds);
		onDrawHorizontalScrollBar(canvas, scrollBar, bounds.left, bounds.top,
		bounds.right, bounds.bottom);
		if (invalidate) {
		invalidate(left, top, right, bottom);
		invalidate(bounds);
		}
		}

		if (drawVerticalScrollBar) {
		int size = scrollBar.getSize(true);
		if (size <= 0) {
		size = cache.scrollBarSize;
		}

		scrollBar.setParameters(computeVerticalScrollRange(),
		computeVerticalScrollOffset(),
		computeVerticalScrollExtent(), true);
		int verticalScrollbarPosition = mVerticalScrollbarPosition;
		if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) {
		verticalScrollbarPosition = isLayoutRtl() ?
		SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT;
		}
		switch (verticalScrollbarPosition) {
		default:
		case SCROLLBAR_POSITION_RIGHT:
		left = scrollX + width - size - (mUserPaddingRight & inside);
		break;
		case SCROLLBAR_POSITION_LEFT:
		left = scrollX + (mUserPaddingLeft & inside);
		break;
		}
		top = scrollY + (mPaddingTop & inside);
		right = left + size;
		bottom = scrollY + height - (mUserPaddingBottom & inside);
		onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom);
		final Rect bounds = cache.mScrollBarBounds;
		getVerticalScrollBarBounds(bounds);
		onDrawVerticalScrollBar(canvas, scrollBar, bounds.left, bounds.top,
		bounds.right, bounds.bottom);
		if (invalidate) {
		invalidate(left, top, right, bottom);
		invalidate(bounds);
		}
		}
		}
		@@ -21201,6 +21389,9 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		* @see PointerIcon
		*/
		public PointerIcon getPointerIcon(MotionEvent event, float x, float y) {
		if (isDraggingScrollBar() \|\| isOnScrollbarThumb(x, y)) {
		return PointerIcon.getSystemIcon(mContext, PointerIcon.STYLE_ARROW);
		}
		return mPointerIcon;
		}

		@@ -22457,6 +22648,15 @@ public class View implements Drawable.Callback, KeyEvent.Callback,

		private int mLastColor;

		public final Rect mScrollBarBounds = new Rect();

		public static final int NOT_DRAGGING = 0;
		public static final int DRAGGING_VERTICAL_SCROLL_BAR = 1;
		public static final int DRAGGING_HORIZONTAL_SCROLL_BAR = 2;
		public int mScrollBarDraggingState = NOT_DRAGGING;

		public float mScrollBarDraggingPos = 0;

		public ScrollabilityCache(ViewConfiguration configuration, View host) {
		fadingEdgeLength = configuration.getScaledFadingEdgeLength();
		scrollBarSize = configuration.getScaledScrollBarSize();

core/java/android/view/ViewGroup.java

+20 −1

Original line number	Diff line number	Diff line
		@@ -59,6 +59,7 @@ import java.util.Collections;
		import java.util.HashSet;
		import java.util.List;
		import java.util.Map;

		import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1;

		/**
		@@ -1717,6 +1718,9 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager

		@Override
		public PointerIcon getPointerIcon(MotionEvent event, float x, float y) {
		if (isOnScrollbarThumb(x, y) \|\| isDraggingScrollBar()) {
		return PointerIcon.getSystemIcon(mContext, PointerIcon.STYLE_ARROW);
		}
		// Check what the child under the pointer says about the pointer.
		final int childrenCount = mChildrenCount;
		if (childrenCount != 0) {
		@@ -2027,7 +2031,7 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		* hover exit event in {@link #onHoverEvent} and then the hovered child will
		* receive a hover enter event.
		* </p><p>
		* The default implementation always returns false.
		* The default implementation handles mouse hover on the scroll bars.
		* </p>
		*
		* @param event The motion event that describes the hover.
		@@ -2035,6 +2039,15 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		* and prevent its children from receiving it.
		*/
		public boolean onInterceptHoverEvent(MotionEvent event) {
		if (event.isFromSource(InputDevice.SOURCE_MOUSE)) {
		final int action = event.getAction();
		final float x = event.getX();
		final float y = event.getY();
		if ((action == MotionEvent.ACTION_HOVER_MOVE
		\|\| action == MotionEvent.ACTION_HOVER_ENTER) && isOnScrollbar(x, y)) {
		return true;
		}
		}
		return false;
		}

		@@ -2781,6 +2794,12 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		* messages will be delivered here.
		*/
		public boolean onInterceptTouchEvent(MotionEvent ev) {
		if (ev.isFromSource(InputDevice.SOURCE_MOUSE)
		&& ev.getAction() == MotionEvent.ACTION_DOWN
		&& ev.isButtonPressed(MotionEvent.BUTTON_PRIMARY)
		&& isOnScrollbarThumb(ev.getX(), ev.getY())) {
		return true;
		}
		return false;
		}

core/java/android/widget/AbsListView.java

+7 −0

Original line number	Diff line number	Diff line
		@@ -3669,6 +3669,13 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		}
		}

		/** @hide */
		@Override
		protected boolean handleScrollBarDragging(MotionEvent event) {
		// Doesn't support normal scroll bar dragging. Use FastScroller.
		return false;
		}

		@Override
		public boolean onTouchEvent(MotionEvent ev) {
		if (!isEnabled()) {

core/java/android/widget/HorizontalScrollView.java

+4 −0

Original line number	Diff line number	Diff line
		@@ -454,6 +454,10 @@ public class HorizontalScrollView extends FrameLayout {
		return true;
		}

		if (super.onInterceptTouchEvent(ev)) {
		return true;
		}

		switch (action & MotionEvent.ACTION_MASK) {
		case MotionEvent.ACTION_MOVE: {
		/*

core/java/android/widget/ScrollBarDrawable.java

+9 −15

Original line number	Diff line number	Diff line
		@@ -16,6 +16,8 @@

		package android.widget;

		import com.android.internal.widget.ScrollBarUtils;

		import android.graphics.Canvas;
		import android.graphics.ColorFilter;
		import android.graphics.PixelFormat;
		@@ -135,23 +137,15 @@ public class ScrollBarDrawable extends Drawable implements Drawable.Callback {
		}

		if (drawThumb) {
		final int size = vertical ? r.height() : r.width();
		final int scrollBarLength = vertical ? r.height() : r.width();
		final int thickness = vertical ? r.width() : r.height();
		final int minLength = thickness * 2;

		// Avoid the tiny thumb.
		int length = Math.round((float) size * extent / range);
		if (length < minLength) {
		length = minLength;
		}

		// Avoid the too-big thumb.
		int offset = Math.round((float) (size - length) * mOffset / (range - extent));
		if (offset > size - length) {
		offset = size - length;
		}
		final int thumbLength =
		ScrollBarUtils.getThumbLength(scrollBarLength, thickness, extent, range);
		final int thumbOffset =
		ScrollBarUtils.getThumbOffset(scrollBarLength, thumbLength, extent, range,
		mOffset);

		drawThumb(canvas, r, offset, length, vertical);
		drawThumb(canvas, r, thumbOffset, thumbLength, vertical);
		}
		}