mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
|
/* -*- 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/. */
|
||
|
|
|
||
|
|
#ifndef ScrollbarActivity_h___
|
||
|
|
#define ScrollbarActivity_h___
|
||
|
|
|
||
|
|
#include "nsCOMPtr.h"
|
||
|
|
#include "mozilla/TimeStamp.h"
|
||
|
|
|
||
|
|
class nsIContent;
|
||
|
|
class nsITimer;
|
||
|
|
class nsIAtom;
|
||
|
|
class nsIScrollableFrame;
|
||
|
|
|
||
|
|
namespace mozilla {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* ScrollbarActivity
|
||
|
|
*
|
||
|
|
* This class manages scrollbar active state. When some activity occured
|
||
|
|
* the 'active' attribute of the both the horizontal scrollbar and vertical
|
||
|
|
* scrollbar is set.
|
||
|
|
* After a small amount of time of inactivity this attribute is unset from
|
||
|
|
* both scrollbars.
|
||
|
|
* Some css specific rules can affect the scrollbar, like showing/hiding it
|
||
|
|
* with a fade transition.
|
||
|
|
*
|
||
|
|
* Initial scrollbar activity needs to be reported by the scrollbar frame that
|
||
|
|
* owns the ScrollbarActivity instance. This needs to happen via a call to
|
||
|
|
* ActivityOccurred(), for example when the current scroll position or the size
|
||
|
|
* of the scroll area changes.
|
||
|
|
*
|
||
|
|
* ScrollbarActivity then wait until a timeout has expired or a new call to
|
||
|
|
* ActivityOccured() has been made. When the timeout expires ActivityFinished()
|
||
|
|
* is call and reset the active state.
|
||
|
|
*/
|
||
|
|
|
||
|
|
class ScrollbarActivity {
|
||
|
|
public:
|
||
|
|
ScrollbarActivity(nsIScrollableFrame* aScrollableFrame)
|
||
|
|
: mIsActive(false)
|
||
|
|
, mScrollableFrame(aScrollableFrame)
|
||
|
|
{}
|
||
|
|
|
||
|
|
void ActivityOccurred();
|
||
|
|
void ActivityFinished();
|
||
|
|
~ScrollbarActivity();
|
||
|
|
|
||
|
|
protected:
|
||
|
|
/*
|
||
|
|
* mIsActive is true once any type of activity occurent on the scrollable
|
||
|
|
* frame and until kScrollbarActivityFinishedDelay has expired.
|
||
|
|
* This does not reflect the value of the 'active' attributes on scrollbars.
|
||
|
|
*/
|
||
|
|
bool mIsActive;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Hold a reference to the scrollable frame in order to retrieve the
|
||
|
|
* horizontal and vertical scrollbar boxes where to set the 'active'
|
||
|
|
* attribute.
|
||
|
|
*/
|
||
|
|
nsIScrollableFrame* mScrollableFrame;
|
||
|
|
|
||
|
|
nsCOMPtr<nsITimer> mActivityFinishedTimer;
|
||
|
|
|
||
|
|
void SetIsActive(bool aNewActive);
|
||
|
|
|
||
|
|
enum { kScrollbarActivityFinishedDelay = 450 }; // milliseconds
|
||
|
|
static void ActivityFinishedTimerFired(nsITimer* aTimer, void* aSelf) {
|
||
|
|
reinterpret_cast<ScrollbarActivity*>(aSelf)->ActivityFinished();
|
||
|
|
}
|
||
|
|
void StartActivityFinishedTimer();
|
||
|
|
void CancelActivityFinishedTimer();
|
||
|
|
|
||
|
|
nsIContent* GetScrollbarContent(bool aVertical);
|
||
|
|
nsIContent* GetHorizontalScrollbar() {
|
||
|
|
return GetScrollbarContent(false);
|
||
|
|
}
|
||
|
|
nsIContent* GetVerticalScrollbar() {
|
||
|
|
return GetScrollbarContent(true);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace mozilla
|
||
|
|
|
||
|
|
#endif /* ScrollbarActivity_h___ */
|