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Bug 1556556 - Document WidgetEvent::mRefPoint as being in visual coordinates. r=kats

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This is already the case for real input events since that's how they
arrive from APZ, and we are no longer changing the coordinates at
the process boundary.

For synthesized events, a future patch will add layout-to-visual
converions to code that sets mRefPoint as appropriate.

Differential Revision: https://phabricator.services.mozilla.com/D68917
This commit is contained in:
Botond Ballo 2020-05-05 19:24:41 +00:00
parent 0e4ceea622
commit 6bda5b208d
1 changed files with 3 additions and 0 deletions
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3
widget/BasicEvents.h
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@ -559,6 +559,9 @@ class WidgetEvent : public WidgetEventTime {
EventMessage mMessage;
// Relative to the widget of the event, or if there is no widget then it is
// in screen coordinates. Not modified by layout code.
// This is in visual coordinates, i.e. the correct RelativeTo value that
// expresses what this is relative to is `{viewportFrame, Visual}`, where
// `viewportFrame` is the viewport frame of the widget's root document.
LayoutDeviceIntPoint mRefPoint;
// The previous mRefPoint, if known, used to calculate mouse movement deltas.
LayoutDeviceIntPoint mLastRefPoint;