forked from mirrors/gecko-dev
38b10eafda
This rewrites scrollbar layout to work with regular reflow rather than box layout. Overall it's about the same amount of code (mostly because nsScrollbarFrame::Reflow is sorta hand-rolled), but it cleans up a bit and it is progress towards removing XUL layout altogether, without getting into much deeper refactoring. This also blocks some other performance improvements and refactorings I want to make in this code. We make some assumptions to simplify the code that to some extent were made already before, both explicitly and by virtue of using XUL layout. In particular, we assume that scrollbar / slider / thumb has no border or padding and that the writing-mode is horizontal ltr. Differential Revision: https://phabricator.services.mozilla.com/D173489
86 lines
2.9 KiB
C++
86 lines
2.9 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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Eric D Vaughan
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This class lays out its children either vertically or horizontally
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**/
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#ifndef nsScrollbarButtonFrame_h___
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#define nsScrollbarButtonFrame_h___
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#include "SimpleXULLeafFrame.h"
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#include "mozilla/Attributes.h"
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#include "nsLeafFrame.h"
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#include "nsRepeatService.h"
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namespace mozilla {
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class PresShell;
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} // namespace mozilla
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class nsScrollbarButtonFrame final : public mozilla::SimpleXULLeafFrame {
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public:
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NS_DECL_FRAMEARENA_HELPERS(nsScrollbarButtonFrame)
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explicit nsScrollbarButtonFrame(ComputedStyle* aStyle,
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nsPresContext* aPresContext)
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: mozilla::SimpleXULLeafFrame(aStyle, aPresContext, kClassID) {}
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// Overrides
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void DestroyFrom(nsIFrame* aDestructRoot,
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PostDestroyData& aPostDestroyData) override;
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friend nsIFrame* NS_NewScrollbarButtonFrame(mozilla::PresShell* aPresShell,
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ComputedStyle* aStyle);
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nsresult HandleEvent(nsPresContext* aPresContext,
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mozilla::WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus) override;
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static nsresult GetChildWithTag(nsAtom* atom, nsIFrame* start,
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nsIFrame*& result);
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static nsresult GetParentWithTag(nsAtom* atom, nsIFrame* start,
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nsIFrame*& result);
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bool HandleButtonPress(nsPresContext* aPresContext,
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mozilla::WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus);
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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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return NS_OK;
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}
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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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return NS_OK;
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}
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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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protected:
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void StartRepeat() {
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nsRepeatService::GetInstance()->Start(Notify, this, mContent->OwnerDoc(),
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"nsScrollbarButtonFrame"_ns);
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}
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void StopRepeat() { nsRepeatService::GetInstance()->Stop(Notify, this); }
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void Notify();
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static void Notify(void* aData) {
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static_cast<nsScrollbarButtonFrame*>(aData)->Notify();
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}
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bool mCursorOnThis = false;
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};
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#endif
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