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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "DragTracker.h"
#include "InputData.h"
#define DRAG_LOG(...)
// #define DRAG_LOG(...) printf_stderr("DRAG: " __VA_ARGS__)
namespace mozilla {
namespace layers {
DragTracker::DragTracker()
: mInDrag(false)
{
}
/*static*/ bool
DragTracker::StartsDrag(const MouseInput& aInput)
{
return aInput.IsLeftButton() && aInput.mType == MouseInput::MOUSE_DOWN;
}
/*static*/ bool
DragTracker::EndsDrag(const MouseInput& aInput)
{
// On Windows, we don't receive a MOUSE_UP at the end of a drag if an
// actual drag session took place. As a backup, we detect the end of the
// drag using the MOUSE_DRAG_END event, which normally is routed directly
// to content, but we're specially routing to APZ for this purpose. Bug
// 1265105 tracks a solution to this at the Windows widget layer; once
// that is implemented, this workaround can be removed.
return (aInput.IsLeftButton() && aInput.mType == MouseInput::MOUSE_UP)
|| aInput.mType == MouseInput::MOUSE_DRAG_END;
}
void
DragTracker::Update(const MouseInput& aInput)
{
if (StartsDrag(aInput)) {
DRAG_LOG("Starting drag\n");
mInDrag = true;
} else if (EndsDrag(aInput)) {
DRAG_LOG("Ending drag\n");
mInDrag = false;
mOnScrollbar = Nothing();
}
}
bool
DragTracker::InDrag() const
{
return mInDrag;
}
bool
DragTracker::IsOnScrollbar(bool aOnScrollbar)
{
if (!mOnScrollbar) {
DRAG_LOG("Setting hitscrollbar %d\n", aOnScrollbar);
mOnScrollbar = Some(aOnScrollbar);
}
return mOnScrollbar.value();
}
} // namespace layers
} // namespace mozilla
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