Revision c175d5f75eec49972870442ab9e32e5740e3f8d2 authored by Ryan VanderMeulen on 24 June 2014, 00:59:12 UTC, committed by Ryan VanderMeulen on 24 June 2014, 00:59:12 UTC
1 parent db03cd6
nsScrollbarFrame.cpp
/* -*- 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/. */
//
// Eric Vaughan
// Netscape Communications
//
// See documentation in associated header file
//
#include "nsScrollbarFrame.h"
#include "nsScrollbarButtonFrame.h"
#include "nsGkAtoms.h"
#include "nsIScrollableFrame.h"
#include "nsIScrollbarMediator.h"
#include "mozilla/LookAndFeel.h"
#include "nsThemeConstants.h"
#include "nsRenderingContext.h"
#include "nsIContent.h"
using namespace mozilla;
//
// NS_NewScrollbarFrame
//
// Creates a new scrollbar frame and returns it
//
nsIFrame*
NS_NewScrollbarFrame (nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsScrollbarFrame (aPresShell, aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsScrollbarFrame)
NS_QUERYFRAME_HEAD(nsScrollbarFrame)
NS_QUERYFRAME_ENTRY(nsScrollbarFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsBoxFrame)
void
nsScrollbarFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
nsBoxFrame::Init(aContent, aParent, aPrevInFlow);
// We want to be a reflow root since we use reflows to move the
// slider. Any reflow inside the scrollbar frame will be a reflow to
// move the slider and will thus not change anything outside of the
// scrollbar or change the size of the scrollbar frame.
mState |= NS_FRAME_REFLOW_ROOT;
}
NS_IMETHODIMP
nsScrollbarFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
nsresult rv = nsBoxFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
NS_ENSURE_SUCCESS(rv, rv);
// nsGfxScrollFrame may have told us to shrink to nothing. If so, make sure our
// desired size agrees.
if (aReflowState.availableWidth == 0) {
aDesiredSize.width = 0;
}
if (aReflowState.availableHeight == 0) {
aDesiredSize.height = 0;
}
return NS_OK;
}
nsIAtom*
nsScrollbarFrame::GetType() const
{
return nsGkAtoms::scrollbarFrame;
}
NS_IMETHODIMP
nsScrollbarFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
nsresult rv = nsBoxFrame::AttributeChanged(aNameSpaceID, aAttribute,
aModType);
// if the current position changes, notify any nsGfxScrollFrame
// parent we may have
if (aAttribute != nsGkAtoms::curpos)
return rv;
nsIScrollableFrame* scrollable = do_QueryFrame(GetParent());
if (!scrollable)
return rv;
nsCOMPtr<nsIContent> kungFuDeathGrip(mContent);
scrollable->CurPosAttributeChanged(mContent);
return rv;
}
NS_IMETHODIMP
nsScrollbarFrame::HandlePress(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
return NS_OK;
}
NS_IMETHODIMP
nsScrollbarFrame::HandleMultiplePress(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus,
bool aControlHeld)
{
return NS_OK;
}
NS_IMETHODIMP
nsScrollbarFrame::HandleDrag(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
return NS_OK;
}
NS_IMETHODIMP
nsScrollbarFrame::HandleRelease(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
return NS_OK;
}
void
nsScrollbarFrame::SetScrollbarMediatorContent(nsIContent* aMediator)
{
mScrollbarMediator = aMediator;
}
nsIScrollbarMediator*
nsScrollbarFrame::GetScrollbarMediator()
{
if (!mScrollbarMediator)
return nullptr;
nsIFrame* f = mScrollbarMediator->GetPrimaryFrame();
// check if the frame is a scroll frame. If so, get the scrollable frame
// inside it.
nsIScrollableFrame* scrollFrame = do_QueryFrame(f);
if (scrollFrame) {
f = scrollFrame->GetScrolledFrame();
}
nsIScrollbarMediator* sbm = do_QueryFrame(f);
return sbm;
}
NS_IMETHODIMP
nsScrollbarFrame::GetMargin(nsMargin& aMargin)
{
aMargin.SizeTo(0,0,0,0);
if (LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars) != 0) {
nsPresContext* presContext = PresContext();
nsITheme* theme = presContext->GetTheme();
if (theme) {
nsIntSize size;
bool isOverridable;
nsRefPtr<nsRenderingContext> rc =
presContext->PresShell()->GetReferenceRenderingContext();
theme->GetMinimumWidgetSize(rc, this, NS_THEME_SCROLLBAR, &size,
&isOverridable);
if (IsHorizontal()) {
aMargin.top = -presContext->DevPixelsToAppUnits(size.height);
}
else {
if (StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
aMargin.right = -presContext->DevPixelsToAppUnits(size.width);
}
else {
aMargin.left = -presContext->DevPixelsToAppUnits(size.width);
}
}
return NS_OK;
}
}
return nsBox::GetMargin(aMargin);
}
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