gecko-dev/layout/xul/nsScrollbarFrame.h
Timothy Guan-tin Chien aaebd8920d Bug 1431246 - Create and update scrollbar markup in nsScrollbarFrame r=enndeakin+6102
nsScrollbarFrame::CreateAnonymousContent() would create the children
markup originally created by XBL. The attributes updated by XBL attribute
inheritance is updated by nsScrollbarFrame::UpdateChildrenAttributeValue().

This removes the XBL part of the scrollbar implementation.

MozReview-Commit-ID: FWi3HR2qkwF

--HG--
extra : rebase_source : c0b1b2ddbccb1d8e9d523db91a5b81fbcfa328e9
2018-04-09 22:01:02 +08:00

137 lines
4.6 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
//
// nsScrollbarFrame
//
#ifndef nsScrollbarFrame_h__
#define nsScrollbarFrame_h__
#include "mozilla/Attributes.h"
#include "nsIAnonymousContentCreator.h"
#include "nsBoxFrame.h"
class nsIScrollbarMediator;
nsIFrame* NS_NewScrollbarFrame(nsIPresShell* aPresShell,
mozilla::ComputedStyle* aStyle);
class nsScrollbarFrame final : public nsBoxFrame,
public nsIAnonymousContentCreator
{
public:
explicit nsScrollbarFrame(ComputedStyle* aStyle)
: nsBoxFrame(aStyle, kClassID)
, mIncrement(0)
, mSmoothScroll(false)
, mScrollbarMediator(nullptr)
, mUpTopButton(nullptr)
, mDownTopButton(nullptr)
, mSlider(nullptr)
, mThumb(nullptr)
, mUpBottomButton(nullptr)
, mDownBottomButton(nullptr)
{}
NS_DECL_QUERYFRAME
NS_DECL_FRAMEARENA_HELPERS(nsScrollbarFrame)
#ifdef DEBUG_FRAME_DUMP
virtual nsresult GetFrameName(nsAString& aResult) const override {
return MakeFrameName(NS_LITERAL_STRING("ScrollbarFrame"), aResult);
}
#endif
// nsIFrame overrides
virtual nsresult AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) override;
NS_IMETHOD HandlePress(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) override;
NS_IMETHOD HandleMultiplePress(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus,
bool aControlHeld) override;
NS_IMETHOD HandleDrag(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) override;
NS_IMETHOD HandleRelease(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) override;
virtual void DestroyFrom(nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData) override;
virtual void Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
virtual void Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) override;
void SetScrollbarMediatorContent(nsIContent* aMediator);
nsIScrollbarMediator* GetScrollbarMediator();
// nsBox methods
/**
* Treat scrollbars as clipping their children; overflowing children
* will not be allowed to set an overflow rect on this
* frame. This means that when the scroll code decides to hide a
* scrollframe by setting its height or width to zero, that will
* hide the children too.
*/
virtual bool DoesClipChildren() override { return true; }
virtual nsresult GetXULMargin(nsMargin& aMargin) override;
/**
* The following three methods set the value of mIncrement when a
* scrollbar button is pressed.
*/
void SetIncrementToLine(int32_t aDirection);
void SetIncrementToPage(int32_t aDirection);
void SetIncrementToWhole(int32_t aDirection);
/**
* MoveToNewPosition() adds mIncrement to the current position and
* updates the curpos attribute.
* @returns The new position after clamping, in CSS Pixels
* @note This method might destroy the frame, pres shell, and other objects.
*/
int32_t MoveToNewPosition();
int32_t GetIncrement() { return mIncrement; }
// nsIAnonymousContentCreator
virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) override;
virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
uint32_t aFilter) override;
void UpdateChildrenAttributeValue(nsAtom* aAttribute, bool aNotify);
protected:
int32_t mIncrement; // Amount to scroll, in CSSPixels
bool mSmoothScroll;
private:
nsCOMPtr<nsIContent> mScrollbarMediator;
nsCOMPtr<Element> mUpTopButton;
nsCOMPtr<Element> mDownTopButton;
nsCOMPtr<Element> mSlider;
nsCOMPtr<Element> mThumb;
nsCOMPtr<Element> mUpBottomButton;
nsCOMPtr<Element> mDownBottomButton;
}; // class nsScrollbarFrame
#endif