Attachment 346304 Details for Bug 188239 – Patch

[patch] Patch

bug-188239-20180801145901.patch (text/plain), 32.75 KB, created by Tim Horton on 2018-08-01 14:59:02 PDT

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Creator: Tim Horton

Created: 2018-08-01 14:59:02 PDT

Size: 32.75 KB

patch

obsolete

>Subversion Revision: 234460
>diff --git a/Source/WebCore/PAL/ChangeLog b/Source/WebCore/PAL/ChangeLog
>index d7bbd969f070ee808326da3344a138addb9bed99..154c78341e683fe7334d2abf32ad1918d9d65b13 100644
>--- a/Source/WebCore/PAL/ChangeLog
>+++ b/Source/WebCore/PAL/ChangeLog
>@@ -1,3 +1,14 @@
>+2018-08-01  Tim Horton  <timothy_horton@apple.com>
>+
>+        Using the keyboard arrow keys to scroll a webpage is very slow, not smooth, takes too long
>+        https://bugs.webkit.org/show_bug.cgi?id=188239
>+        <rdar://problem/22997654>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * pal/spi/cocoa/QuartzCoreSPI.h:
>+        Add a piece of SPI.
>+
> 2018-07-30  Sihui Liu  <sihui_liu@apple.com>
> 
>         Add support for fetching and remove type  _WKWebsiteDataTypeHSTSCache
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index 7b97a4fcc8f735414c08c33fea1b3c86d16ced06..db033da983fc4dcbfba0ba4f0bf7a39333fe1497 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,94 @@
>+2018-08-01  Tim Horton  <timothy_horton@apple.com>
>+
>+        Using the keyboard arrow keys to scroll a webpage is very slow, not smooth, takes too long
>+        https://bugs.webkit.org/show_bug.cgi?id=188239
>+        <rdar://problem/22997654>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Instead of depending on key repeat to drive scrolling with arrow keys held down,
>+        run a display link that animates the scroll. We still do a single discrete scroll
>+        first (so that you can tap the key and shift by line/page), but then on the first
>+        repeat we ramp up to a constant velocity determined by the desired increment,
>+        stopping when the key is lifted or a different key is pressed.
>+
>+        * UIProcess/API/Cocoa/WKWebView.mm:
>+        (-[WKWebView _scrollByContentOffset:animated:]):
>+        (-[WKWebView _scrollByContentOffset:]): Deleted.
>+        * UIProcess/API/Cocoa/WKWebViewInternal.h:
>+        Add animated parameter to scrollByContentOffset, and plumb it through to UIScrollView.
>+
>+        * UIProcess/ios/WKContentViewInteraction.h:
>+        Add a WKKeyboardScrollingAnimator member.
>+        Conform to WKKeyboardScrollable.
>+
>+        * UIProcess/ios/WKContentViewInteraction.mm:
>+        (-[WKContentView setupInteraction]):
>+        Install the WKKeyboardScrollingAnimator.
>+
>+        (-[WKContentView cleanupInteraction]):
>+        Uninstall the WKKeyboardScrollingAnimator.
>+
>+        (-[WKContentView unscaledView]):
>+        Fix a stupid style nit.
>+
>+        (-[WKContentView handleKeyWebEvent:]):
>+        Give WKKeyboardScrollingAnimator the first shot at incoming keyboard events.
>+        It will only consume events here if it's already performing a scrolling animation
>+        (because otherwise they should go straight through to the page).
>+
>+        (-[WKContentView _interpretKeyEvent:isCharEvent:]):
>+        Give WKKeyboardScrollingAnimator a shot at handling keyboard events that
>+        the web content did not handle. We will only start a scrolling animation
>+        if the page did not handle an event that would start a scroll.
>+
>+        (-[WKContentView isKeyboardScrollable]):
>+        Part of WKKeyboardScrollable; only report ourselves as scrollable if
>+        we would previously have allowed scrolling from keyboard events (if
>+        we're not in contenteditable, and don't have a <select> focused).
>+
>+        (-[WKContentView distanceForScrollingIncrement:]):
>+        Part of WKKeyboardScrollable; compute the distance for each scrolling increment.
>+
>+        (-[WKContentView scrollByContentOffset:animated:]):
>+        Part of WKKeyboardScrollable; plumb scrolls up to WKWebView.
>+
>+        (-[WKContentView _scrollOffsetForEvent:]): Moved to WKKeyboardScrollingAnimator.mm.
>+
>+        * UIProcess/ios/WKKeyboardScrollingAnimator.h: Added.
>+        * UIProcess/ios/WKKeyboardScrollingAnimator.mm: Added.
>+        (-[WKKeyboardScrollingAnimator init]):
>+        (-[WKKeyboardScrollingAnimator initWithScrollable:]):
>+        (-[WKKeyboardScrollingAnimator invalidate]):
>+        (-[WKKeyboardScrollingAnimator _scrollOffsetForEvent:]):
>+        Compute the scroll offset given a particular event. This is moved from WKContentView;
>+        otherwise the primary change is that it now asks the WKKeyboardScrollable
>+        for the distance instead of computing it directly.
>+
>+        (-[WKKeyboardScrollingAnimator beginWithEvent:]):
>+        If we're currently in the initial state (WaitingForFirstEvent), and
>+        a given event should start a scroll, transition into WaitingForRepeat,
>+        and do a single animated scroll of the appropriate distance.
>+
>+        (-[WKKeyboardScrollingAnimator handleKeyEvent:]):
>+        If this key event should terminate a scroll (because it is either a keyup
>+        or a different key than the current scroll), shut down any running animations.
>+
>+        If this is the first key repeat after the initial scroll, start a scrolling
>+        animation.
>+
>+        Eat the event if it either started or continued a scroll.
>+
>+        (-[WKKeyboardScrollingAnimator startAnimatedScroll]):
>+        (-[WKKeyboardScrollingAnimator stopAnimatedScroll]):
>+        Helpers to start and stop the display link and do some bookkeeping.
>+
>+        (-[WKKeyboardScrollingAnimator displayLinkFired:]):
>+        Ask the WKKeyboardScrollable to scroll the content based on the frame time,
>+        an acceleration curve, and the current animation's scrolling increment.
>+
>+        * WebKit.xcodeproj/project.pbxproj:
>+
> 2018-08-01  Commit Queue  <commit-queue@webkit.org>
> 
>         Unreviewed, rolling out r234443 and r234445.
>diff --git a/Source/WebCore/PAL/pal/spi/cocoa/QuartzCoreSPI.h b/Source/WebCore/PAL/pal/spi/cocoa/QuartzCoreSPI.h
>index 67e08d5182ba4074db06e8674b3bc99112afdb89..6a0eca0ab50aebfabaf561f1e532b7f4436391d9 100644
>--- a/Source/WebCore/PAL/pal/spi/cocoa/QuartzCoreSPI.h
>+++ b/Source/WebCore/PAL/pal/spi/cocoa/QuartzCoreSPI.h
>@@ -41,6 +41,7 @@
> #import <QuartzCore/CAContext.h>
> #import <QuartzCore/CALayerHost.h>
> #import <QuartzCore/CALayerPrivate.h>
>+#import <QuartzCore/CAMediaTimingFunctionPrivate.h>
> #import <QuartzCore/QuartzCorePrivate.h>
> 
> #if PLATFORM(MAC)
>@@ -153,6 +154,10 @@ typedef enum {
> @property CGFloat velocity;
> @end
> 
>+@interface CAMediaTimingFunction ()
>+- (float)_solveForInput:(float)t;
>+@end
>+
> #endif // __OBJC__
> 
> #endif
>diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm b/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>index 53df915717dca340fc7ca36616a735f7419ffeec..b10a01c04a7180012de9c651d07461a4424bca17 100644
>--- a/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>+++ b/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>@@ -2113,7 +2113,7 @@ - (BOOL)_scrollToRect:(WebCore::FloatRect)targetRect origin:(WebCore::FloatPoint
>     return true;
> }
> 
>-- (void)_scrollByContentOffset:(WebCore::FloatPoint)contentOffsetDelta
>+- (void)_scrollByContentOffset:(WebCore::FloatPoint)contentOffsetDelta animated:(BOOL)animated
> {
>     WebCore::FloatPoint scaledOffsetDelta = contentOffsetDelta;
>     CGFloat zoomScale = contentZoomScale(self);
>@@ -2128,7 +2128,7 @@ - (void)_scrollByContentOffset:(WebCore::FloatPoint)contentOffsetDelta
> 
>     LOG_WITH_STREAM(VisibleRects, stream << "_scrollByContentOffset: scrolling to " << WebCore::FloatPoint(boundedOffset));
> 
>-    [_scrollView setContentOffset:boundedOffset animated:YES];
>+    [_scrollView setContentOffset:boundedOffset animated:animated];
> }
> 
> - (void)_zoomOutWithOrigin:(WebCore::FloatPoint)origin animated:(BOOL)animated
>diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKWebViewInternal.h b/Source/WebKit/UIProcess/API/Cocoa/WKWebViewInternal.h
>index aab3010f5d831f190b9a944af2676f871c57d0be..3a0541c410417cb0cb8dddde69eee2244cf9da1c 100644
>--- a/Source/WebKit/UIProcess/API/Cocoa/WKWebViewInternal.h
>+++ b/Source/WebKit/UIProcess/API/Cocoa/WKWebViewInternal.h
>@@ -91,7 +91,7 @@ struct PrintInfo;
> 
> - (void)_scrollToContentScrollPosition:(WebCore::FloatPoint)scrollPosition scrollOrigin:(WebCore::IntPoint)scrollOrigin;
> - (BOOL)_scrollToRect:(WebCore::FloatRect)targetRect origin:(WebCore::FloatPoint)origin minimumScrollDistance:(float)minimumScrollDistance;
>-- (void)_scrollByContentOffset:(WebCore::FloatPoint)offset;
>+- (void)_scrollByContentOffset:(WebCore::FloatPoint)offset animated:(BOOL)animated;
> - (void)_zoomToFocusRect:(WebCore::FloatRect)focusedElementRect selectionRect:(WebCore::FloatRect)selectionRectInDocumentCoordinates insideFixed:(BOOL)insideFixed fontSize:(float)fontSize minimumScale:(double)minimumScale maximumScale:(double)maximumScale allowScaling:(BOOL)allowScaling forceScroll:(BOOL)forceScroll;
> - (BOOL)_zoomToRect:(WebCore::FloatRect)targetRect withOrigin:(WebCore::FloatPoint)origin fitEntireRect:(BOOL)fitEntireRect minimumScale:(double)minimumScale maximumScale:(double)maximumScale minimumScrollDistance:(float)minimumScrollDistance;
> - (void)_zoomOutWithOrigin:(WebCore::FloatPoint)origin animated:(BOOL)animated;
>diff --git a/Source/WebKit/UIProcess/ios/WKContentViewInteraction.h b/Source/WebKit/UIProcess/ios/WKContentViewInteraction.h
>index f8e4584ebefc8d8b8e7262eb8fc400b61dcd1457..31a6283b28c11f0e7d9428c2589cf5966f3d3807 100644
>--- a/Source/WebKit/UIProcess/ios/WKContentViewInteraction.h
>+++ b/Source/WebKit/UIProcess/ios/WKContentViewInteraction.h
>@@ -37,6 +37,7 @@
> #import "WKAirPlayRoutePicker.h"
> #import "WKFileUploadPanel.h"
> #import "WKFormPeripheral.h"
>+#import "WKKeyboardScrollingAnimator.h"
> #import "WKSyntheticClickTapGestureRecognizer.h"
> #import <UIKit/UIView.h>
> #import <WebCore/Color.h>
>@@ -215,6 +216,8 @@ struct WKAutoCorrectionData {
>     
>     std::unique_ptr<WebKit::InputViewUpdateDeferrer> _inputViewUpdateDeferrer;
> 
>+    RetainPtr<WKKeyboardScrollingAnimator> _keyboardScrollingAnimator;
>+
>     BOOL _isEditable;
>     BOOL _showingTextStyleOptions;
>     BOOL _hasValidPositionInformation;
>@@ -260,7 +263,7 @@ struct WKAutoCorrectionData {
> 
> @end
> 
>-@interface WKContentView (WKInteraction) <UIGestureRecognizerDelegate, UITextAutoscrolling, UITextInputMultiDocument, UITextInputPrivate, UIWebFormAccessoryDelegate, UIWebTouchEventsGestureRecognizerDelegate, UIWKInteractionViewProtocol, WKActionSheetAssistantDelegate, WKFileUploadPanelDelegate
>+@interface WKContentView (WKInteraction) <UIGestureRecognizerDelegate, UITextAutoscrolling, UITextInputMultiDocument, UITextInputPrivate, UIWebFormAccessoryDelegate, UIWebTouchEventsGestureRecognizerDelegate, UIWKInteractionViewProtocol, WKActionSheetAssistantDelegate, WKFileUploadPanelDelegate, WKKeyboardScrollable
> #if ENABLE(DATA_INTERACTION)
>     , UIDragInteractionDelegate, UIDropInteractionDelegate
> #endif
>diff --git a/Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm b/Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm
>index a1a4dc8b6056a8fe6d69430d0d4669e1ce670082..4199cf2d9777b230dcb4d3c9b95c42d1e1a0ee80 100644
>--- a/Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm
>+++ b/Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm
>@@ -622,6 +622,8 @@ - (void)setupInteraction
>         [self.superview addSubview:_interactionViewsContainerView.get()];
>     }
> 
>+    _keyboardScrollingAnimator = adoptNS([[WKKeyboardScrollingAnimator alloc] initWithScrollable:self]);
>+
>     [self.layer addObserver:self forKeyPath:@"transform" options:NSKeyValueObservingOptionInitial context:nil];
> 
>     _touchEventGestureRecognizer = adoptNS([[UIWebTouchEventsGestureRecognizer alloc] initWithTarget:self action:@selector(_webTouchEventsRecognized:) touchDelegate:self]);
>@@ -778,6 +780,9 @@ - (void)cleanupInteraction
>     
>     _inputViewUpdateDeferrer = nullptr;
>     _assistedNodeInformation = { };
>+    
>+    [_keyboardScrollingAnimator invalidate];
>+    _keyboardScrollingAnimator = nil;
> }
> 
> - (void)_removeDefaultGestureRecognizers
>@@ -808,7 +813,7 @@ - (void)_addDefaultGestureRecognizers
> #endif
> }
> 
>-- (UIView*)unscaledView
>+- (UIView *)unscaledView
> {
>     return _interactionViewsContainerView.get();
> }
>@@ -3638,6 +3643,9 @@ - (void)handleKeyEvent:(::UIEvent *)event
> 
> - (void)handleKeyWebEvent:(::WebEvent *)theEvent
> {
>+    if ([_keyboardScrollingAnimator handleKeyEvent:theEvent])
>+        return;
>+
>     _page->handleKeyboardEvent(NativeWebKeyboardEvent(theEvent));
> }
> 
>@@ -3676,73 +3684,6 @@ - (void)_didHandleKeyEvent:(::WebEvent *)event eventWasHandled:(BOOL)eventWasHan
>     _uiEventBeingResent = nil;
> }
> 
>-- (std::optional<FloatPoint>)_scrollOffsetForEvent:(::WebEvent *)event
>-{
>-    static const unsigned kWebSpaceKey = 0x20;
>-
>-    if (_page->editorState().isContentEditable)
>-        return std::nullopt;
>-    
>-    if (_assistedNodeInformation.elementType == InputType::Select)
>-        return std::nullopt;
>-
>-    NSString *charactersIgnoringModifiers = event.charactersIgnoringModifiers;
>-    if (!charactersIgnoringModifiers.length)
>-        return std::nullopt;
>-
>-    enum ScrollingIncrement { Document, Page, Line };
>-    enum ScrollingDirection { Up, Down, Left, Right };
>-
>-    auto computeOffset = ^(ScrollingIncrement increment, ScrollingDirection direction) {
>-        bool isHorizontal = (direction == Left || direction == Right);
>-
>-        CGFloat scrollDistance = ^ CGFloat {
>-            switch (increment) {
>-            case Document:
>-                ASSERT(!isHorizontal);
>-                return self.bounds.size.height;
>-            case Page:
>-                ASSERT(!isHorizontal);
>-                return Scrollbar::pageStep(_page->unobscuredContentRect().height(), self.bounds.size.height);
>-            case Line:
>-                return Scrollbar::pixelsPerLineStep();
>-            }
>-            ASSERT_NOT_REACHED();
>-            return 0;
>-        }();
>-
>-        if (direction == Up || direction == Left)
>-            scrollDistance = -scrollDistance;
>-        
>-        return (isHorizontal ? FloatPoint(scrollDistance, 0) : FloatPoint(0, scrollDistance));
>-    };
>-
>-    if ([charactersIgnoringModifiers isEqualToString:UIKeyInputLeftArrow])
>-        return computeOffset(Line, Left);
>-    if ([charactersIgnoringModifiers isEqualToString:UIKeyInputRightArrow])
>-        return computeOffset(Line, Right);
>-
>-    ScrollingIncrement incrementForVerticalArrowKey = Line;
>-    if (event.modifierFlags & WebEventFlagMaskAlternate)
>-        incrementForVerticalArrowKey = Page;
>-    else if (event.modifierFlags & WebEventFlagMaskCommand)
>-        incrementForVerticalArrowKey = Document;
>-    if ([charactersIgnoringModifiers isEqualToString:UIKeyInputUpArrow])
>-        return computeOffset(incrementForVerticalArrowKey, Up);
>-    if ([charactersIgnoringModifiers isEqualToString:UIKeyInputDownArrow])
>-        return computeOffset(incrementForVerticalArrowKey, Down);
>-
>-    if ([charactersIgnoringModifiers isEqualToString:UIKeyInputPageDown])
>-        return computeOffset(Page, Down);
>-    if ([charactersIgnoringModifiers isEqualToString:UIKeyInputPageUp])
>-        return computeOffset(Page, Up);
>-
>-    if ([charactersIgnoringModifiers characterAtIndex:0] == kWebSpaceKey)
>-        return computeOffset(Page, (event.modifierFlags & WebEventFlagMaskShift) ? Up : Down);
>-
>-    return std::nullopt;
>-}
>-
> - (BOOL)_interpretKeyEvent:(::WebEvent *)event isCharEvent:(BOOL)isCharEvent
> {
>     static const unsigned kWebEnterKey = 0x0003;
>@@ -3757,10 +3698,8 @@ - (BOOL)_interpretKeyEvent:(::WebEvent *)event isCharEvent:(BOOL)isCharEvent
>     if (!contentEditable && event.isTabKey)
>         return NO;
> 
>-    if (std::optional<FloatPoint> scrollOffset = [self _scrollOffsetForEvent:event]) {
>-        [_webView _scrollByContentOffset:*scrollOffset];
>+    if ([_keyboardScrollingAnimator beginWithEvent:event])
>         return YES;
>-    }
> 
>     UIKeyboardImpl *keyboard = [UIKeyboardImpl sharedInstance];
>     NSString *characters = event.characters;
>@@ -3808,6 +3747,36 @@ - (BOOL)_interpretKeyEvent:(::WebEvent *)event isCharEvent:(BOOL)isCharEvent
>     return NO;
> }
> 
>+- (BOOL)isKeyboardScrollable
>+{
>+    if (_page->editorState().isContentEditable)
>+        return false;
>+
>+    if (_assistedNodeInformation.elementType == InputType::Select)
>+        return false;
>+
>+    return true;
>+}
>+
>+- (CGFloat)distanceForScrollingIncrement:(ScrollingIncrement)increment
>+{
>+    switch (increment) {
>+    case ScrollingIncrement::Document:
>+        return self.bounds.size.height;
>+    case ScrollingIncrement::Page:
>+        return WebCore::Scrollbar::pageStep(_page->unobscuredContentRect().height(), self.bounds.size.height);
>+    case ScrollingIncrement::Line:
>+        return WebCore::Scrollbar::pixelsPerLineStep();
>+    }
>+    ASSERT_NOT_REACHED();
>+    return 0;
>+}
>+
>+- (void)scrollByContentOffset:(WebCore::FloatPoint)offset animated:(BOOL)animated
>+{
>+    [_webView _scrollByContentOffset:offset animated:animated];
>+}
>+
> - (void)executeEditCommandWithCallback:(NSString *)commandName
> {
>     [self beginSelectionChange];
>diff --git a/Source/WebKit/UIProcess/ios/WKKeyboardScrollingAnimator.h b/Source/WebKit/UIProcess/ios/WKKeyboardScrollingAnimator.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..a539ad720991e0beb766208c033c583fb54ddf2c
>--- /dev/null
>+++ b/Source/WebKit/UIProcess/ios/WKKeyboardScrollingAnimator.h
>@@ -0,0 +1,64 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#if PLATFORM(IOS)
>+
>+namespace WebCore {
>+class FloatPoint;
>+}
>+
>+namespace WebKit {
>+
>+enum class ScrollingIncrement : uint8_t {
>+    Document,
>+    Page,
>+    Line
>+};
>+
>+}
>+
>+@class WebEvent;
>+@protocol WKKeyboardScrollable;
>+
>+@interface WKKeyboardScrollingAnimator : NSObject
>+
>+- (instancetype)init NS_UNAVAILABLE;
>+- (instancetype)initWithScrollable:(id <WKKeyboardScrollable>)scrollable;
>+
>+- (void)invalidate;
>+
>+- (BOOL)beginWithEvent:(::WebEvent *)event;
>+- (BOOL)handleKeyEvent:(::WebEvent *)event;
>+
>+@end
>+
>+@protocol WKKeyboardScrollable <NSObject>
>+@required
>+- (BOOL)isKeyboardScrollable;
>+- (CGFloat)distanceForScrollingIncrement:(WebKit::ScrollingIncrement)increment;
>+- (void)scrollByContentOffset:(WebCore::FloatPoint)offset animated:(BOOL)animated;
>+@end
>+
>+#endif // PLATFORM(IOS)
>diff --git a/Source/WebKit/UIProcess/ios/WKKeyboardScrollingAnimator.mm b/Source/WebKit/UIProcess/ios/WKKeyboardScrollingAnimator.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..eb756b649eb05b40a04235ecf8a8640f3bd85f84
>--- /dev/null
>+++ b/Source/WebKit/UIProcess/ios/WKKeyboardScrollingAnimator.mm
>@@ -0,0 +1,204 @@
>+/*
>+ * Copyright (C) 2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "WKKeyboardScrollingAnimator.h"
>+
>+#if PLATFORM(IOS)
>+
>+#import "UIKitSPI.h"
>+#import <WebCore/FloatPoint.h>
>+#import <WebCore/WebEvent.h>
>+#import <algorithm>
>+#import <pal/spi/cocoa/QuartzCoreSPI.h>
>+#import <wtf/RetainPtr.h>
>+
>+using namespace WebKit;
>+
>+namespace WebKit {
>+
>+enum class KeyboardScrollingAnimatorState : uint8_t {
>+    WaitingForFirstEvent,
>+    WaitingForRepeat,
>+    Animating
>+};
>+
>+};
>+
>+@implementation WKKeyboardScrollingAnimator {
>+    id <WKKeyboardScrollable> _scrollable;
>+    CFTimeInterval _startTime;
>+    WebCore::FloatPoint _scrollOffsetPerIncrement;
>+    RetainPtr<CADisplayLink> _displayLink;
>+    KeyboardScrollingAnimatorState _state;
>+}
>+
>+- (instancetype)init
>+{
>+    return nil;
>+}
>+
>+- (instancetype)initWithScrollable:(id <WKKeyboardScrollable>)scrollable
>+{
>+    self = [super init];
>+    if (!self)
>+        return nil;
>+
>+    _scrollable = scrollable;
>+
>+    return self;
>+}
>+
>+- (void)invalidate
>+{
>+    [self stopAnimatedScroll];
>+    _scrollable = nil;
>+}
>+
>+- (std::optional<WebCore::FloatPoint>)_scrollOffsetForEvent:(::WebEvent *)event
>+{
>+    static const unsigned kWebSpaceKey = 0x20;
>+
>+    if (![_scrollable isKeyboardScrollable])
>+        return std::nullopt;
>+
>+    NSString *charactersIgnoringModifiers = event.charactersIgnoringModifiers;
>+    if (!charactersIgnoringModifiers.length)
>+        return std::nullopt;
>+
>+    enum class ScrollingDirection : uint8_t { Up, Down, Left, Right };
>+
>+    auto computeOffset = ^(ScrollingIncrement increment, ScrollingDirection direction) {
>+        bool isHorizontal = (direction == ScrollingDirection::Left || direction == ScrollingDirection::Right);
>+
>+        CGFloat scrollDistance = [_scrollable distanceForScrollingIncrement:increment];
>+
>+        if (direction == ScrollingDirection::Up || direction == ScrollingDirection::Left)
>+            scrollDistance = -scrollDistance;
>+
>+        return (isHorizontal ? WebCore::FloatPoint(scrollDistance, 0) : WebCore::FloatPoint(0, scrollDistance));
>+    };
>+
>+    if ([charactersIgnoringModifiers isEqualToString:UIKeyInputLeftArrow])
>+        return computeOffset(ScrollingIncrement::Line, ScrollingDirection::Left);
>+    if ([charactersIgnoringModifiers isEqualToString:UIKeyInputRightArrow])
>+        return computeOffset(ScrollingIncrement::Line, ScrollingDirection::Right);
>+
>+    ScrollingIncrement incrementForVerticalArrowKey = ScrollingIncrement::Line;
>+    if (event.modifierFlags & WebEventFlagMaskAlternate)
>+        incrementForVerticalArrowKey = ScrollingIncrement::Page;
>+    else if (event.modifierFlags & WebEventFlagMaskCommand)
>+        incrementForVerticalArrowKey = ScrollingIncrement::Document;
>+    if ([charactersIgnoringModifiers isEqualToString:UIKeyInputUpArrow])
>+        return computeOffset(incrementForVerticalArrowKey, ScrollingDirection::Up);
>+    if ([charactersIgnoringModifiers isEqualToString:UIKeyInputDownArrow])
>+        return computeOffset(incrementForVerticalArrowKey, ScrollingDirection::Down);
>+
>+    if ([charactersIgnoringModifiers isEqualToString:UIKeyInputPageDown])
>+        return computeOffset(ScrollingIncrement::Page, ScrollingDirection::Down);
>+    if ([charactersIgnoringModifiers isEqualToString:UIKeyInputPageUp])
>+        return computeOffset(ScrollingIncrement::Page, ScrollingDirection::Up);
>+
>+    if ([charactersIgnoringModifiers characterAtIndex:0] == kWebSpaceKey)
>+        return computeOffset(ScrollingIncrement::Page, (event.modifierFlags & WebEventFlagMaskShift) ? ScrollingDirection::Up : ScrollingDirection::Down);
>+
>+    return std::nullopt;
>+}
>+
>+- (BOOL)beginWithEvent:(::WebEvent *)event
>+{
>+    if (_state != KeyboardScrollingAnimatorState::WaitingForFirstEvent)
>+        return NO;
>+
>+    auto offset = [self _scrollOffsetForEvent:event];
>+
>+    if (!offset)
>+        return NO;
>+
>+    _state = KeyboardScrollingAnimatorState::WaitingForRepeat;
>+    _scrollOffsetPerIncrement = *offset;
>+
>+    // The first keyboard event that starts scrolling performs its own
>+    // discrete animated scroll. Continuously animated scrolling starts
>+    // when the key repeats.
>+    [_scrollable scrollByContentOffset:_scrollOffsetPerIncrement animated:YES];
>+
>+    return YES;
>+}
>+
>+- (BOOL)handleKeyEvent:(::WebEvent *)event
>+{
>+    if (_state == KeyboardScrollingAnimatorState::WaitingForFirstEvent)
>+        return NO;
>+
>+    auto offset = [self _scrollOffsetForEvent:event];
>+    if (!offset || offset != _scrollOffsetPerIncrement || event.type == WebEventKeyUp) {
>+        [self stopAnimatedScroll];
>+        return NO;
>+    }
>+
>+    if (_state == KeyboardScrollingAnimatorState::WaitingForRepeat)
>+        [self startAnimatedScroll];
>+
>+    return YES;
>+}
>+
>+- (void)startAnimatedScroll
>+{
>+    ASSERT(!_displayLink);
>+
>+    _state = KeyboardScrollingAnimatorState::Animating;
>+    _startTime = CACurrentMediaTime();
>+    _displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(displayLinkFired:)];
>+    [_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
>+}
>+
>+- (void)stopAnimatedScroll
>+{
>+    _state = KeyboardScrollingAnimatorState::WaitingForFirstEvent;
>+    [_displayLink invalidate];
>+    _displayLink = nil;
>+}
>+
>+- (void)displayLinkFired:(CADisplayLink *)sender
>+{
>+    const CFTimeInterval secondsPerScrollIncrement = 0.05; // Seconds it should take to cover one increment when at full speed.
>+    const float maximumVelocity = 2000; // Maximum velocity in pixels per second. Empirically determined.
>+    const float accelerationDuration = 0.3; // Duration of acceleration in seconds. This matches UIScrollView.
>+
>+    auto velocity = _scrollOffsetPerIncrement.scaled(1. / secondsPerScrollIncrement);
>+    velocity = velocity.constrainedBetween({ -maximumVelocity, -maximumVelocity }, { maximumVelocity, maximumVelocity });
>+
>+    CFTimeInterval frameDuration = sender.targetTimestamp - sender.timestamp;
>+    CFTimeInterval timeFromAnimationStart = sender.timestamp - _startTime;
>+    float accelerationFactor = [[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut] _solveForInput:timeFromAnimationStart / accelerationDuration];
>+
>+    auto contentOffset = velocity.scaled(accelerationFactor * frameDuration);
>+    [_scrollable scrollByContentOffset:contentOffset animated:NO];
>+}
>+
>+@end
>+
>+#endif // PLATFORM(IOS)
>diff --git a/Source/WebKit/WebKit.xcodeproj/project.pbxproj b/Source/WebKit/WebKit.xcodeproj/project.pbxproj
>index 6f86e045b576d1b626220f0959566399afbdb2e9..a2da24976da283e2117a308a3b52371e912bc878 100644
>--- a/Source/WebKit/WebKit.xcodeproj/project.pbxproj
>+++ b/Source/WebKit/WebKit.xcodeproj/project.pbxproj
>@@ -618,6 +618,7 @@
> 		2D1087601D2C573E00B85F82 /* LoadParameters.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 2D10875E1D2C573E00B85F82 /* LoadParameters.cpp */; };
> 		2D1087611D2C573E00B85F82 /* LoadParameters.h in Headers */ = {isa = PBXBuildFile; fileRef = 2D10875F1D2C573E00B85F82 /* LoadParameters.h */; };
> 		2D1087631D2C641B00B85F82 /* LoadParametersCocoa.mm in Sources */ = {isa = PBXBuildFile; fileRef = 2D1087621D2C641B00B85F82 /* LoadParametersCocoa.mm */; };
>+		2D11BD1F21125BE8009D99E3 /* WKKeyboardScrollingAnimator.mm in Sources */ = {isa = PBXBuildFile; fileRef = 2DD5E126210ADC7A00DB6012 /* WKKeyboardScrollingAnimator.mm */; };
> 		2D125C5E1857EA05003BA3CB /* ViewGestureController.h in Headers */ = {isa = PBXBuildFile; fileRef = 2D125C5C1857EA05003BA3CB /* ViewGestureController.h */; };
> 		2D125C5F1857EA05003BA3CB /* ViewGestureControllerMac.mm in Sources */ = {isa = PBXBuildFile; fileRef = 2D125C5D1857EA05003BA3CB /* ViewGestureControllerMac.mm */; };
> 		2D12DAB520662C73006F00FB /* WKAnimationDelegate.h in Headers */ = {isa = PBXBuildFile; fileRef = 2D12DAB420662C73006F00FB /* WKAnimationDelegate.h */; };
>@@ -717,6 +718,7 @@
> 		2DD45ADF1E5F8972006C355F /* InputViewUpdateDeferrer.mm in Sources */ = {isa = PBXBuildFile; fileRef = 2DD45ADD1E5F8972006C355F /* InputViewUpdateDeferrer.mm */; };
> 		2DD5A7291EBF08D5009BA597 /* VisibleWebPageCounter.h in Headers */ = {isa = PBXBuildFile; fileRef = 2DD5A7281EBF08D5009BA597 /* VisibleWebPageCounter.h */; };
> 		2DD5A72B1EBF09A7009BA597 /* HiddenPageThrottlingAutoIncreasesCounter.h in Headers */ = {isa = PBXBuildFile; fileRef = 2DD5A72A1EBF09A7009BA597 /* HiddenPageThrottlingAutoIncreasesCounter.h */; };
>+		2DD5E129210ADC7B00DB6012 /* WKKeyboardScrollingAnimator.h in Headers */ = {isa = PBXBuildFile; fileRef = 2DD5E127210ADC7A00DB6012 /* WKKeyboardScrollingAnimator.h */; };
> 		2DD67A2E1BD819730053B251 /* APIFindMatchesClient.h in Headers */ = {isa = PBXBuildFile; fileRef = 2DD67A2D1BD819730053B251 /* APIFindMatchesClient.h */; };
> 		2DD67A351BD861060053B251 /* WKTextFinderClient.h in Headers */ = {isa = PBXBuildFile; fileRef = 2DD67A331BD861060053B251 /* WKTextFinderClient.h */; };
> 		2DD67A361BD861060053B251 /* WKTextFinderClient.mm in Sources */ = {isa = PBXBuildFile; fileRef = 2DD67A341BD861060053B251 /* WKTextFinderClient.mm */; };
>@@ -3190,6 +3192,8 @@
> 		2DD45ADD1E5F8972006C355F /* InputViewUpdateDeferrer.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = InputViewUpdateDeferrer.mm; path = ios/InputViewUpdateDeferrer.mm; sourceTree = "<group>"; };
> 		2DD5A7281EBF08D5009BA597 /* VisibleWebPageCounter.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = VisibleWebPageCounter.h; sourceTree = "<group>"; };
> 		2DD5A72A1EBF09A7009BA597 /* HiddenPageThrottlingAutoIncreasesCounter.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = HiddenPageThrottlingAutoIncreasesCounter.h; sourceTree = "<group>"; };
>+		2DD5E126210ADC7A00DB6012 /* WKKeyboardScrollingAnimator.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = WKKeyboardScrollingAnimator.mm; path = ios/WKKeyboardScrollingAnimator.mm; sourceTree = "<group>"; };
>+		2DD5E127210ADC7A00DB6012 /* WKKeyboardScrollingAnimator.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = WKKeyboardScrollingAnimator.h; path = ios/WKKeyboardScrollingAnimator.h; sourceTree = "<group>"; };
> 		2DD67A2D1BD819730053B251 /* APIFindMatchesClient.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = APIFindMatchesClient.h; sourceTree = "<group>"; };
> 		2DD67A331BD861060053B251 /* WKTextFinderClient.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WKTextFinderClient.h; sourceTree = "<group>"; };
> 		2DD67A341BD861060053B251 /* WKTextFinderClient.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = WKTextFinderClient.mm; sourceTree = "<group>"; };
>@@ -5984,6 +5988,8 @@
> 				0F3C7257196F5F5000AEDD0C /* WKInspectorHighlightView.mm */,
> 				A54293A2195A43C6002782C7 /* WKInspectorNodeSearchGestureRecognizer.h */,
> 				A54293A3195A43C6002782C7 /* WKInspectorNodeSearchGestureRecognizer.mm */,
>+				2DD5E127210ADC7A00DB6012 /* WKKeyboardScrollingAnimator.h */,
>+				2DD5E126210ADC7A00DB6012 /* WKKeyboardScrollingAnimator.mm */,
> 				2DA1E4FC18C02B6A00DBC929 /* WKLegacyPDFView.h */,
> 				2DA1E4FD18C02B6A00DBC929 /* WKLegacyPDFView.mm */,
> 				A15EEDE41E301CEE000069B0 /* WKPasswordView.h */,
>@@ -9789,6 +9795,7 @@
> 				994BADF41F7D781400B571E7 /* WKInspectorViewController.h in Headers */,
> 				A5C0F0AB2000658200536536 /* WKInspectorWindow.h in Headers */,
> 				A518B5D21FE1D55B00F9FA28 /* WKInspectorWKWebView.h in Headers */,
>+				2DD5E129210ADC7B00DB6012 /* WKKeyboardScrollingAnimator.h in Headers */,
> 				51A9E10B1315CD18009E7031 /* WKKeyValueStorageManager.h in Headers */,
> 				2D790A9F1AD7164900AB90B3 /* WKLayoutMode.h in Headers */,
> 				2DA1E4FE18C02B6A00DBC929 /* WKLegacyPDFView.h in Headers */,
>@@ -11633,6 +11640,7 @@
> 				994BADF31F7D781100B571E7 /* WKInspectorViewController.mm in Sources */,
> 				A5C0F0AC2000658500536536 /* WKInspectorWindow.mm in Sources */,
> 				A518B5D31FE1D55B00F9FA28 /* WKInspectorWKWebView.mm in Sources */,
>+				2D11BD1F21125BE8009D99E3 /* WKKeyboardScrollingAnimator.mm in Sources */,
> 				51A9E10A1315CD18009E7031 /* WKKeyValueStorageManager.cpp in Sources */,
> 				2DA1E4FF18C02B6A00DBC929 /* WKLegacyPDFView.mm in Sources */,
> 				C98C48A91B6FD5B500145103 /* WKMediaSessionFocusManager.cpp in Sources */,

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Attachments on bug 188239: 346302 | 346304 | 346312 | 346313