[Webkit-unassigned] [Bug 21794] New: Middle-click panning should be springloaded while dragging

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=21794

           Summary: Middle-click panning should be springloaded while
                    dragging
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aroben at apple.com


There are two panning modes in Firefox and IE: springloaded and
non-springloaded:

Springloaded: Panning only occurs while the middle mouse button is down. This
is triggered by a middle-mouse-button-drag.

Non-springloaded: Panning occurs between the first middle-click and a
subsequent middle-click. This is triggered by a middle-click.

WebKit currently only implements the non-springloaded behavior. We need to
implement the springloaded behavior.

To reproduce:

1. Go to any web page
2. Resize the Safari window so that the page has scroll bars
3. Press the middle mouse button and hold it down
4. Move the mouse around while holding down the middle mouse button
5. Release the middle mouse button

After step 5, panning mode should be aborted. Instead, panning mode continues
until you click the middle mouse button again.

This is a difference from middle-click panning behavior in Firefox and IE.


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