зеркало из https://github.com/mozilla/gecko-dev.git
144 строки
4.7 KiB
C++
144 строки
4.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//
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// nsScrollbarFrame
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//
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#ifndef nsScrollbarFrame_h__
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#define nsScrollbarFrame_h__
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#include "mozilla/Attributes.h"
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#include "nsIAnonymousContentCreator.h"
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#include "nsBoxFrame.h"
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class nsIScrollbarMediator;
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namespace mozilla {
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class PresShell;
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namespace dom {
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class Element;
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}
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} // namespace mozilla
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nsIFrame* NS_NewScrollbarFrame(mozilla::PresShell* aPresShell,
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mozilla::ComputedStyle* aStyle);
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class nsScrollbarFrame final : public nsBoxFrame,
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public nsIAnonymousContentCreator {
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using Element = mozilla::dom::Element;
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public:
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explicit nsScrollbarFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
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: nsBoxFrame(aStyle, aPresContext, kClassID),
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mIncrement(0),
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mSmoothScroll(false),
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mScrollbarMediator(nullptr),
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mUpTopButton(nullptr),
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mDownTopButton(nullptr),
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mSlider(nullptr),
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mThumb(nullptr),
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mUpBottomButton(nullptr),
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mDownBottomButton(nullptr) {}
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NS_DECL_QUERYFRAME
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NS_DECL_FRAMEARENA_HELPERS(nsScrollbarFrame)
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#ifdef DEBUG_FRAME_DUMP
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virtual nsresult GetFrameName(nsAString& aResult) const override {
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return MakeFrameName(u"ScrollbarFrame"_ns, aResult);
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}
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#endif
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// nsIFrame overrides
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virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
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int32_t aModType) override;
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NS_IMETHOD HandlePress(nsPresContext* aPresContext,
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mozilla::WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus) override;
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NS_IMETHOD HandleMultiplePress(nsPresContext* aPresContext,
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mozilla::WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus,
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bool aControlHeld) override;
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MOZ_CAN_RUN_SCRIPT
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NS_IMETHOD HandleDrag(nsPresContext* aPresContext,
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mozilla::WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus) override;
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NS_IMETHOD HandleRelease(nsPresContext* aPresContext,
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mozilla::WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus) override;
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virtual void DestroyFrom(nsIFrame* aDestructRoot,
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PostDestroyData& aPostDestroyData) override;
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virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) override;
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void SetScrollbarMediatorContent(nsIContent* aMediator);
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nsIScrollbarMediator* GetScrollbarMediator();
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// nsBox methods
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/**
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* Treat scrollbars as clipping their children; overflowing children
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* will not be allowed to set an overflow rect on this
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* frame. This means that when the scroll code decides to hide a
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* scrollframe by setting its height or width to zero, that will
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* hide the children too.
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*/
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virtual bool DoesClipChildren() override { return true; }
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virtual nsresult GetXULMargin(nsMargin& aMargin) override;
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/**
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* The following three methods set the value of mIncrement when a
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* scrollbar button is pressed.
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*/
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void SetIncrementToLine(int32_t aDirection);
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void SetIncrementToPage(int32_t aDirection);
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void SetIncrementToWhole(int32_t aDirection);
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/**
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* MoveToNewPosition() adds mIncrement to the current position and
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* updates the curpos attribute.
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* @returns The new position after clamping, in CSS Pixels
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* @note This method might destroy the frame, pres shell, and other objects.
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*/
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int32_t MoveToNewPosition();
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int32_t GetIncrement() { return mIncrement; }
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// nsIAnonymousContentCreator
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virtual nsresult CreateAnonymousContent(
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nsTArray<ContentInfo>& aElements) override;
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virtual void AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
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uint32_t aFilter) override;
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void UpdateChildrenAttributeValue(nsAtom* aAttribute, bool aNotify);
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protected:
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int32_t mIncrement; // Amount to scroll, in CSSPixels
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bool mSmoothScroll;
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private:
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nsCOMPtr<nsIContent> mScrollbarMediator;
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nsCOMPtr<Element> mUpTopButton;
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nsCOMPtr<Element> mDownTopButton;
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nsCOMPtr<Element> mSlider;
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nsCOMPtr<Element> mThumb;
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nsCOMPtr<Element> mUpBottomButton;
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nsCOMPtr<Element> mDownBottomButton;
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}; // class nsScrollbarFrame
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#endif
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