gecko-dev/layout/xul/nsScrollbarFrame.cpp

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/* -*- 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 "nsSliderFrame.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"
#include "nsIDOMMutationEvent.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,
nsContainerFrame* 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;
}
void
nsScrollbarFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
nsBoxFrame::Reflow(aPresContext, aDesiredSize, aReflowState, aStatus);
// 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;
}
}
nsIAtom*
nsScrollbarFrame::GetType() const
{
return nsGkAtoms::scrollbarFrame;
}
nsresult
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();
nsIScrollableFrame* scrollFrame = do_QueryFrame(f);
nsIScrollbarMediator* sbm;
if (scrollFrame) {
nsIFrame* scrolledFrame = scrollFrame->GetScrolledFrame();
sbm = do_QueryFrame(scrolledFrame);
if (sbm) {
return sbm;
}
}
sbm = do_QueryFrame(f);
if (f && !sbm) {
f = f->PresContext()->PresShell()->GetRootScrollFrame();
if (f && f->GetContent() == mScrollbarMediator) {
return do_QueryFrame(f);
}
}
return sbm;
}
nsresult
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;
theme->GetMinimumWidgetSize(presContext, 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);
}
void
nsScrollbarFrame::SetIncrementToLine(int32_t aDirection)
{
// get the scrollbar's content node
nsIContent* content = GetContent();
mSmoothScroll = true;
mIncrement = aDirection * nsSliderFrame::GetIncrement(content);
}
void
nsScrollbarFrame::SetIncrementToPage(int32_t aDirection)
{
// get the scrollbar's content node
nsIContent* content = GetContent();
mSmoothScroll = true;
mIncrement = aDirection * nsSliderFrame::GetPageIncrement(content);
}
void
nsScrollbarFrame::SetIncrementToWhole(int32_t aDirection)
{
// get the scrollbar's content node
nsIContent* content = GetContent();
if (aDirection == -1)
mIncrement = -nsSliderFrame::GetCurrentPosition(content);
else
mIncrement = nsSliderFrame::GetMaxPosition(content) -
nsSliderFrame::GetCurrentPosition(content);
// Don't repeat or use smooth scrolling if scrolling to beginning or end
// of a page.
mSmoothScroll = false;
}
int32_t
nsScrollbarFrame::MoveToNewPosition()
{
// get the scrollbar's content node
nsCOMPtr<nsIContent> content = GetContent();
// get the current pos
int32_t curpos = nsSliderFrame::GetCurrentPosition(content);
// get the max pos
int32_t maxpos = nsSliderFrame::GetMaxPosition(content);
// increment the given amount
if (mIncrement) {
curpos += mIncrement;
}
// make sure the current position is between the current and max positions
if (curpos < 0) {
curpos = 0;
} else if (curpos > maxpos) {
curpos = maxpos;
}
// set the current position of the slider.
nsAutoString curposStr;
curposStr.AppendInt(curpos);
nsWeakFrame weakFrame(this);
if (mSmoothScroll) {
content->SetAttr(kNameSpaceID_None, nsGkAtoms::smooth, NS_LITERAL_STRING("true"), false);
}
content->SetAttr(kNameSpaceID_None, nsGkAtoms::curpos, curposStr, false);
// notify the nsScrollbarFrame of the change
AttributeChanged(kNameSpaceID_None, nsGkAtoms::curpos, nsIDOMMutationEvent::MODIFICATION);
if (!weakFrame.IsAlive()) {
return curpos;
}
// notify all nsSliderFrames of the change
nsIFrame::ChildListIterator childLists(this);
for (; !childLists.IsDone(); childLists.Next()) {
nsFrameList::Enumerator childFrames(childLists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* f = childFrames.get();
nsSliderFrame* sliderFrame = do_QueryFrame(f);
if (sliderFrame) {
sliderFrame->AttributeChanged(kNameSpaceID_None, nsGkAtoms::curpos, nsIDOMMutationEvent::MODIFICATION);
if (!weakFrame.IsAlive()) {
return curpos;
}
}
}
}
// See if we have appearance information for a theme.
const nsStyleDisplay* disp = StyleDisplay();
nsPresContext* presContext = PresContext();
if (disp->mAppearance) {
nsITheme *theme = presContext->GetTheme();
if (theme && theme->ThemeSupportsWidget(presContext, this, disp->mAppearance)) {
bool repaint;
theme->WidgetStateChanged(this, disp->mAppearance, nsGkAtoms::curpos, &repaint);
}
}
content->UnsetAttr(kNameSpaceID_None, nsGkAtoms::smooth, false);
return curpos;
}