Use selection handle to scroll edit text (557748df) · Commits · e / os / android_frameworks_base

core/java/android/webkit/WebViewClassic.java

+100 −17

Original line number	Diff line number	Diff line
		@@ -828,6 +828,13 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
		// if AUTO_REDRAW_HACK is true, then the CALL key will toggle redrawing
		// the screen all-the-time. Good for profiling our drawing code
		static private final boolean AUTO_REDRAW_HACK = false;

		// The rate at which edit text is scrolled in content pixels per millisecond
		static private final float TEXT_SCROLL_RATE = 0.01f;

		// The presumed scroll rate for the first scroll of edit text
		static private final long TEXT_SCROLL_FIRST_SCROLL_MS = 16;

		// true means redraw the screen all-the-time. Only with AUTO_REDRAW_HACK
		private boolean mAutoRedraw;

		@@ -853,6 +860,7 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
		boolean mIsEditingText = false;
		ArrayList<Message> mBatchedTextChanges = new ArrayList<Message>();
		boolean mIsBatchingTextChanges = false;
		private long mLastEditScroll = 0;

		private static class OnTrimMemoryListener implements ComponentCallbacks2 {
		private static OnTrimMemoryListener sInstance = null;
		@@ -1037,9 +1045,6 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
		// pages with the space bar, in pixels.
		private static final int PAGE_SCROLL_OVERLAP = 24;

		// Time between successive calls to text scroll fling animation
		private static final int TEXT_SCROLL_ANIMATION_DELAY_MS = 16;

		/**
		* These prevent calling requestLayout if either dimension is fixed. This
		* depends on the layout parameters and the measure specs.
		@@ -1207,7 +1212,7 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
		static final int RELOCATE_AUTO_COMPLETE_POPUP = 146;
		static final int FOCUS_NODE_CHANGED = 147;
		static final int AUTOFILL_FORM = 148;
		static final int ANIMATE_TEXT_SCROLL = 149;
		static final int SCROLL_EDIT_TEXT = 149;
		static final int EDIT_TEXT_SIZE_CHANGED = 150;
		static final int SHOW_CARET_HANDLE = 151;
		static final int UPDATE_CONTENT_BOUNDS = 152;
		@@ -6091,6 +6096,11 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
		mSelectDraggingTextQuad.containsPoint(handleX, handleY);
		boolean inEditBounds = mEditTextContentBounds
		.contains(handleX, handleY);
		if (mIsEditingText && !inEditBounds) {
		beginScrollEdit();
		} else {
		endScrollEdit();
		}
		if (inCursorText \|\| (mIsEditingText && !inEditBounds)) {
		snapDraggingCursor();
		}
		@@ -6240,6 +6250,7 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
		break;
		}
		case MotionEvent.ACTION_UP: {
		endScrollEdit();
		if (!mConfirmMove && mIsEditingText && mSelectionStarted &&
		mIsCaretSelection) {
		showPasteWindow();
		@@ -6335,6 +6346,86 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
		}
		}

		/**
		* Returns the text scroll speed in content pixels per millisecond based on
		* the touch location.
		* @param coordinate The x or y touch coordinate in content space
		* @param min The minimum coordinate (x or y) of the edit content bounds
		* @param max The maximum coordinate (x or y) of the edit content bounds
		*/
		private static float getTextScrollSpeed(int coordinate, int min, int max) {
		if (coordinate < min) {
		return (coordinate - min) * TEXT_SCROLL_RATE;
		} else if (coordinate >= max) {
		return (coordinate - max + 1) * TEXT_SCROLL_RATE;
		} else {
		return 0.0f;
		}
		}

		private void beginScrollEdit() {
		if (mLastEditScroll == 0) {
		mLastEditScroll = SystemClock.uptimeMillis() -
		TEXT_SCROLL_FIRST_SCROLL_MS;
		scrollEditWithCursor();
		}
		}

		private void endScrollEdit() {
		mLastEditScroll = 0;
		}

		private static int getTextScrollDelta(float speed, long deltaT) {
		float distance = speed * deltaT;
		int intDistance = (int)Math.floor(distance);
		float probability = distance - intDistance;
		if (Math.random() < probability) {
		intDistance++;
		}
		return intDistance;
		}
		/**
		* Scrolls edit text a distance based on the last touch point,
		* the last scroll time, and the edit text content bounds.
		*/
		private void scrollEditWithCursor() {
		if (mLastEditScroll != 0) {
		int x = viewToContentX(mLastTouchX + getScrollX() + mSelectDraggingOffset.x);
		float scrollSpeedX = getTextScrollSpeed(x, mEditTextContentBounds.left,
		mEditTextContentBounds.right);
		int y = viewToContentY(mLastTouchY + getScrollY() + mSelectDraggingOffset.y);
		float scrollSpeedY = getTextScrollSpeed(y, mEditTextContentBounds.top,
		mEditTextContentBounds.bottom);
		if (scrollSpeedX == 0.0f && scrollSpeedY == 0.0f) {
		endScrollEdit();
		} else {
		long currentTime = SystemClock.uptimeMillis();
		long timeSinceLastUpdate = currentTime - mLastEditScroll;
		int deltaX = getTextScrollDelta(scrollSpeedX, timeSinceLastUpdate);
		int deltaY = getTextScrollDelta(scrollSpeedY, timeSinceLastUpdate);
		mLastEditScroll = currentTime;
		if (deltaX == 0 && deltaY == 0) {
		// By probability no text scroll this time. Try again later.
		mPrivateHandler.sendEmptyMessageDelayed(SCROLL_EDIT_TEXT,
		TEXT_SCROLL_FIRST_SCROLL_MS);
		} else {
		int scrollX = getTextScrollX() + deltaX;
		scrollX = Math.min(getMaxTextScrollX(), scrollX);
		scrollX = Math.max(0, scrollX);
		int scrollY = getTextScrollY() + deltaY;
		scrollY = Math.min(getMaxTextScrollY(), scrollY);
		scrollY = Math.max(0, scrollY);
		scrollEditText(scrollX, scrollY);
		int cursorX = mSelectDraggingCursor.x;
		int cursorY = mSelectDraggingCursor.y;
		mSelectDraggingCursor.set(x - deltaX, y - deltaY);
		updateWebkitSelection();
		mSelectDraggingCursor.set(cursorX, cursorY);
		}
		}
		}
		}

		private void startTouch(float x, float y, long eventTime) {
		// Remember where the motion event started
		mStartTouchX = mLastTouchX = Math.round(x);
		@@ -7673,10 +7764,6 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
		msg.arg1, /* unused */0);
		break;

		case ANIMATE_TEXT_SCROLL:
		computeEditTextScroll();
		break;

		case EDIT_TEXT_SIZE_CHANGED:
		if (msg.arg1 == mFieldPointer) {
		mEditTextContent.set((Rect)msg.obj);
		@@ -7695,6 +7782,10 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
		mEditTextContentBounds.set((Rect) msg.obj);
		break;

		case SCROLL_EDIT_TEXT:
		scrollEditWithCursor();
		break;

		default:
		super.handleMessage(msg);
		break;
		@@ -8005,6 +8096,7 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
		if (isPictureAfterFirstLayout) {
		mViewManager.postReadyToDrawAll();
		}
		scrollEditWithCursor();
		}

		/**
		@@ -8047,13 +8139,6 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
		invalidate();
		}

		private void computeEditTextScroll() {
		if (mEditTextScroller.computeScrollOffset()) {
		scrollEditText(mEditTextScroller.getCurrX(),
		mEditTextScroller.getCurrY());
		}
		}

		private void scrollEditText(int scrollX, int scrollY) {
		// Scrollable edit text. Scroll it.
		float maxScrollX = getMaxTextScrollX();
		@@ -8061,8 +8146,6 @@ public final class WebViewClassic implements WebViewProvider, WebViewProvider.Sc
		mEditTextContent.offsetTo(-scrollX, -scrollY);
		mWebViewCore.sendMessageAtFrontOfQueue(EventHub.SCROLL_TEXT_INPUT, 0,
		scrollY, (Float)scrollPercentX);
		mPrivateHandler.sendEmptyMessageDelayed(ANIMATE_TEXT_SCROLL,
		TEXT_SCROLL_ANIMATION_DELAY_MS);
		}

		private void beginTextBatch() {