[webkit-changes] [WebKit/WebKit] 91d66c: [UnifedPDF] Can't click-drag on scrollbars

[Simon Fraser]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 91d66cef29098316aa703b797edbcee089df4781
      https://github.com/WebKit/WebKit/commit/91d66cef29098316aa703b797edbcee089df4781
  Author: Simon Fraser <simon.fraser at apple.com>
  Date:   2023-12-20 (Wed, 20 Dec 2023)

  Changed paths:
    M Source/WebCore/platform/ScrollableArea.h
    M Source/WebKit/WebProcess/Plugins/PDF/PDFPlugin.h
    M Source/WebKit/WebProcess/Plugins/PDF/PDFPluginBase.h
    M Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.h
    M Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.mm

  Log Message:
  -----------
  [UnifedPDF] Can't click-drag on scrollbars
https://bugs.webkit.org/show_bug.cgi?id=266718
rdar://119874627

Reviewed by Tim Horton.

In order to get click-dragging of UnifedPDF scrollbars to work, we need:
1. Tracking of m_lastMousePositionInPluginCoordinates, so move that down to PDFPluginBase
2. A RemoteScrollbarsController, so override createScrollbarsController() to call through
   to the ChromeClient.

* Source/WebCore/platform/ScrollableArea.h:
* Source/WebKit/WebProcess/Plugins/PDF/PDFPlugin.h:
* Source/WebKit/WebProcess/Plugins/PDF/PDFPluginBase.h:
* Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.h:
* Source/WebKit/WebProcess/Plugins/PDF/UnifiedPDF/UnifiedPDFPlugin.mm:
(WebKit::UnifiedPDFPlugin::createScrollbarsController):
(WebKit::UnifiedPDFPlugin::handleMouseEvent):

Canonical link: https://commits.webkit.org/272385@main