[Webkit-unassigned] [Bug 159751] New: [GTK] Implement touch event emulation in the view layer

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https://bugs.webkit.org/show_bug.cgi?id=159751

            Bug ID: 159751
           Summary: [GTK] Implement touch event emulation in the view
                    layer
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andrunko at gmail.com
                CC: bugs-noreply at webkitgtk.org

While working on kinetic scrolling (bug #155750) I noticed that webkit doesnt have support for touch emulation on the view layer. Touch emulation is only supported in the WebCore layer (bug #77105), but the events there are not propagated to the view (only to the page), meaning testing things like kinetic scrolling (which requires touch events) wouldnt work without a real touchscreen device.

As I didnt have a touchscreen device available, I decided to add a basic support (single touch) for emulation on the view, by sending synthetic touch events when receiving mouse events. The impl uses the GTK_TEST_TOUCHSCREEN env variable to decide whether to enable emulation (as already done by other official GTK+ widgets).

While I believe this wont get integrated, I wanted to leave it here in case someone needs something similar in the future.

Patch to come.

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