tor-browser

The Tor Browser
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DragTracker.cpp (1961B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "DragTracker.h"
      8 
      9 #include "InputData.h"
     10 #include "mozilla/Logging.h"
     11 
     12 static mozilla::LazyLogModule sApzDrgLog("apz.drag");
     13 #define DRAG_LOG(...) MOZ_LOG(sApzDrgLog, LogLevel::Debug, (__VA_ARGS__))
     14 
     15 namespace mozilla {
     16 namespace layers {
     17 
     18 DragTracker::DragTracker() : mInDrag(false) {}
     19 
     20 /*static*/
     21 bool DragTracker::StartsDrag(const MouseInput& aInput) {
     22  return aInput.IsLeftButton() && aInput.mType == MouseInput::MOUSE_DOWN;
     23 }
     24 
     25 /*static*/
     26 bool DragTracker::EndsDrag(const MouseInput& aInput) {
     27  // On Windows, we don't receive a MOUSE_UP at the end of a drag if an
     28  // actual drag session took place. As a backup, we detect the end of the
     29  // drag using the MOUSE_DRAG_END event, which normally is routed directly
     30  // to content, but we're specially routing to APZ for this purpose. Bug
     31  // 1265105 tracks a solution to this at the Windows widget layer; once
     32  // that is implemented, this workaround can be removed.
     33  return (aInput.IsLeftButton() && aInput.mType == MouseInput::MOUSE_UP) ||
     34         aInput.mType == MouseInput::MOUSE_DRAG_END;
     35 }
     36 
     37 void DragTracker::Update(const MouseInput& aInput) {
     38  if (StartsDrag(aInput)) {
     39    DRAG_LOG("Starting drag\n");
     40    mInDrag = true;
     41  } else if (EndsDrag(aInput)) {
     42    DRAG_LOG("Ending drag\n");
     43    mInDrag = false;
     44    mOnScrollbar = Nothing();
     45  }
     46 }
     47 
     48 bool DragTracker::InDrag() const { return mInDrag; }
     49 
     50 bool DragTracker::IsOnScrollbar(bool aOnScrollbar) {
     51  if (!mOnScrollbar) {
     52    DRAG_LOG("Setting hitscrollbar %d\n", aOnScrollbar);
     53    mOnScrollbar = Some(aOnScrollbar);
     54  }
     55  return mOnScrollbar.value();
     56 }
     57 
     58 }  // namespace layers
     59 }  // namespace mozilla