[Mac] Adjust cursor position for dragged link (and stop it from moving based on how fast you are dragging)
https://bugs.webkit.org/show_bug.cgi?id=171764
<rdar://problem/32005865>

Reviewed by Simon Fraser.

* page/DragController.cpp:
(WebCore::DragController::startDrag):
Compute dragImageAnchorPoint only if it is needed.
Don't compute a random unused imageRect.
Factor link drag image offset computation out into DragImage functions
for platforms to override.

Pass dragOrigin (the mouseDown point), not mouseDraggedPoint, to
doSystemDrag, just like all the other drag types. This plus the
WebKit2 change makes the link stable vs. the cursor, instead of
positioned based on how fast you move after the mouse down.

* page/DragController.h:
* page/gtk/DragControllerGtk.cpp:
* page/mac/DragControllerMac.mm:
* page/win/DragControllerWin.cpp:
Move LinkDragBorderInset into DragImage, and share between the non-Mac platforms.

* platform/DragImage.cpp:
(WebCore::dragOffsetForLinkDragImage):
(WebCore::anchorPointForLinkDragImage):
* platform/DragImage.h:
As previously mentioned, move the computation of drag image offset here.

* platform/mac/DragImageMac.mm:
(WebCore::dragOffsetForLinkDragImage):
(WebCore::anchorPointForLinkDragImage):
Put the new drag image to the bottom right of the cursor.

* UIProcess/Cocoa/WebViewImpl.mm:
(WebKit::WebViewImpl::dragImageForView):
Always use the last mouse down event to originate the drag; this was a 2004 hack
to work around a seemingly-fixed macOS bug that somehow propagated into WebKit2.
With WebKit2, this would cause trouble because currentEvent could move on
during the bounce to the Web Content process and back, causing the delta between
clientPoint and the mouse point to be dependent on timing, and thus causing the
link to sit at timing-dependent distance from the cursor, instead of exactly
where dragOffsetForLinkDragImage placed it.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@216303 268f45cc-cd09-0410-ab3c-d52691b4dbfc
11 files changed
tree: 4031e119e411d499e4af799b55afd50ee7545c58
  1. Examples/
  2. JSTests/
  3. LayoutTests/
  4. ManualTests/
  5. PerformanceTests/
  6. Source/
  7. Tools/
  8. WebKit.xcworkspace/
  9. WebKitLibraries/
  10. Websites/
  11. .dir-locals.el
  12. .gitattributes
  13. .gitignore
  14. ChangeLog
  15. ChangeLog-2012-05-22
  16. CMakeLists.txt
  17. Makefile
  18. Makefile.shared
  19. ReadMe.md
ReadMe.md

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Run the following command to clone WebKit's Git SVN repository:

git clone git://git.webkit.org/WebKit.git WebKit

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Tools/Scripts/webkit-patch setup-git-clone

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Run the following command to check out WebKit's subversion repository:

svn checkout https://svn.webkit.org/repository/webkit/trunk WebKit

Building WebKit

Building Mac Port

Install Xcode and its command line tools if you haven't done so already:

  1. Install Xcode Get Xcode from https://developer.apple.com/downloads. To build WebKit for OS X, Xcode 5.1.1 or later is required. To build WebKit for iOS Simulator, Xcode 7 or later is required.
  2. Install the Xcode Command Line Tools In Terminal, run the command: xcode-select --install

Run the following command to build a debug build with debugging symbols and assertions:

Tools/Scripts/build-webkit --debug

For performance testing, and other purposes, use --release instead.

Using Xcode

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The first time after you install a new Xcode, you will need to run the following command to enable Xcode to build command line tools for iOS Simulator:

 sudo Tools/Scripts/configure-xcode-for-ios-development

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Run the following command to build a debug build with debugging symbols and assertions for iOS:

Tools/Scripts/build-webkit --debug --ios-simulator.

Building GTK+ Port

Install the dependencies by running the following command:

Tools/gtk/install-dependencies

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Tools/Scripts/update-webkitgtk-libs

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Tools/Scripts/build-webkit --debug --gtk

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Run the following command to launch Safari with your local build of WebKit:

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