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gecko-dev/layout/xul/nsSplitterFrame.cpp
Botond Ballo 173d001b86 Bug 1556556 - Propagate RelativeTo far and wide. r=kats,mattwoodrow 
This "upgrades" various nsLayoutUtils functions which take as inputs
a set of coordinates and a frame that the coordinates are relative to,
to accept a RelativeTo object instead of a frame.

Most of the patch is just dumb propagation, but the few places where
we use an explicit ViewportType::Visual are important. There are
probably a few other places I've overlooked, but this seems to cover
the important ones that come up commonly.

There are undoubtedly other functions into which we can propagate
RelativeTo, in this patch I've propagated it as far as necessary
for my needs in this bug (mainly GetTransformToAncestor() and
GetEventCoordinatesRelativeTo()).

Differential Revision: https://phabricator.services.mozilla.com/D68919
2020-05-05 19:26:38 +00:00

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/* -*- 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/. */
//
// Eric Vaughan
// Netscape Communications
//
// See documentation in associated header file
//
#include "gfxContext.h"
#include "nsSplitterFrame.h"
#include "nsGkAtoms.h"
#include "nsXULElement.h"
#include "nsPresContext.h"
#include "mozilla/dom/Document.h"
#include "nsNameSpaceManager.h"
#include "nsScrollbarButtonFrame.h"
#include "nsIDOMEventListener.h"
#include "nsFrameList.h"
#include "nsHTMLParts.h"
#include "mozilla/ComputedStyle.h"
#include "nsBoxLayoutState.h"
#include "nsContainerFrame.h"
#include "nsContentCID.h"
#include "nsLayoutUtils.h"
#include "nsDisplayList.h"
#include "nsContentUtils.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/MouseEvent.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/PresShell.h"
#include "mozilla/UniquePtr.h"
using namespace mozilla;
using mozilla::dom::Element;
using mozilla::dom::Event;
class nsSplitterInfo {
public:
nscoord min;
nscoord max;
nscoord current;
nscoord changed;
nsCOMPtr<nsIContent> childElem;
int32_t flex;
int32_t index;
};
class nsSplitterFrameInner final : public nsIDOMEventListener {
protected:
virtual ~nsSplitterFrameInner();
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIDOMEVENTLISTENER
explicit nsSplitterFrameInner(nsSplitterFrame* aSplitter)
: mDidDrag(false),
mDragStart(0),
mParentBox(nullptr),
mChildInfosBeforeCount(0),
mChildInfosAfterCount(0),
mState(Open),
mSplitterPos(0),
mDragging(false) {
mOuter = aSplitter;
mPressed = false;
}
void Disconnect() { mOuter = nullptr; }
nsresult MouseDown(Event* aMouseEvent);
nsresult MouseUp(Event* aMouseEvent);
nsresult MouseMove(Event* aMouseEvent);
void MouseDrag(nsPresContext* aPresContext, WidgetGUIEvent* aEvent);
void MouseUp(nsPresContext* aPresContext, WidgetGUIEvent* aEvent);
void AdjustChildren(nsPresContext* aPresContext);
void AdjustChildren(nsPresContext* aPresContext, nsSplitterInfo* aChildInfos,
int32_t aCount, bool aIsHorizontal);
void AddRemoveSpace(nscoord aDiff, nsSplitterInfo* aChildInfos,
int32_t aCount, int32_t& aSpaceLeft);
void ResizeChildTo(nscoord& aDiff, nsSplitterInfo* aChildrenBeforeInfos,
nsSplitterInfo* aChildrenAfterInfos,
int32_t aChildrenBeforeCount, int32_t aChildrenAfterCount,
bool aBounded);
void UpdateState();
void AddListener();
void RemoveListener();
enum ResizeType { Closest, Farthest, Flex, Grow };
enum State { Open, CollapsedBefore, CollapsedAfter, Dragging };
enum CollapseDirection { Before, After };
ResizeType GetResizeBefore();
ResizeType GetResizeAfter();
State GetState();
void Reverse(UniquePtr<nsSplitterInfo[]>& aIndexes, int32_t aCount);
bool SupportsCollapseDirection(CollapseDirection aDirection);
void EnsureOrient();
void SetPreferredSize(nsBoxLayoutState& aState, nsIFrame* aChildBox,
nscoord aOnePixel, bool aIsHorizontal, nscoord* aSize);
nsSplitterFrame* mOuter;
bool mDidDrag;
nscoord mDragStart;
nsIFrame* mParentBox;
bool mPressed;
UniquePtr<nsSplitterInfo[]> mChildInfosBefore;
UniquePtr<nsSplitterInfo[]> mChildInfosAfter;
int32_t mChildInfosBeforeCount;
int32_t mChildInfosAfterCount;
State mState;
nscoord mSplitterPos;
bool mDragging;
const Element* SplitterElement() const {
return mOuter->GetContent()->AsElement();
}
};
NS_IMPL_ISUPPORTS(nsSplitterFrameInner, nsIDOMEventListener)
nsSplitterFrameInner::ResizeType nsSplitterFrameInner::GetResizeBefore() {
static Element::AttrValuesArray strings[] = {nsGkAtoms::farthest,
nsGkAtoms::flex, nullptr};
switch (SplitterElement()->FindAttrValueIn(
kNameSpaceID_None, nsGkAtoms::resizebefore, strings, eCaseMatters)) {
case 0:
return Farthest;
case 1:
return Flex;
}
return Closest;
}
nsSplitterFrameInner::~nsSplitterFrameInner() = default;
nsSplitterFrameInner::ResizeType nsSplitterFrameInner::GetResizeAfter() {
static Element::AttrValuesArray strings[] = {
nsGkAtoms::farthest, nsGkAtoms::flex, nsGkAtoms::grow, nullptr};
switch (SplitterElement()->FindAttrValueIn(
kNameSpaceID_None, nsGkAtoms::resizeafter, strings, eCaseMatters)) {
case 0:
return Farthest;
case 1:
return Flex;
case 2:
return Grow;
}
return Closest;
}
nsSplitterFrameInner::State nsSplitterFrameInner::GetState() {
static Element::AttrValuesArray strings[] = {nsGkAtoms::dragging,
nsGkAtoms::collapsed, nullptr};
static Element::AttrValuesArray strings_substate[] = {
nsGkAtoms::before, nsGkAtoms::after, nullptr};
switch (SplitterElement()->FindAttrValueIn(
kNameSpaceID_None, nsGkAtoms::state, strings, eCaseMatters)) {
case 0:
return Dragging;
case 1:
switch (SplitterElement()->FindAttrValueIn(
kNameSpaceID_None, nsGkAtoms::substate, strings_substate,
eCaseMatters)) {
case 0:
return CollapsedBefore;
case 1:
return CollapsedAfter;
default:
if (SupportsCollapseDirection(After)) return CollapsedAfter;
return CollapsedBefore;
}
}
return Open;
}
//
// NS_NewSplitterFrame
//
// Creates a new Toolbar frame and returns it
//
nsIFrame* NS_NewSplitterFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
return new (aPresShell) nsSplitterFrame(aStyle, aPresShell->GetPresContext());
}
NS_IMPL_FRAMEARENA_HELPERS(nsSplitterFrame)
nsSplitterFrame::nsSplitterFrame(ComputedStyle* aStyle,
nsPresContext* aPresContext)
: nsBoxFrame(aStyle, aPresContext, kClassID), mInner(0) {}
void nsSplitterFrame::DestroyFrom(nsIFrame* aDestructRoot,
PostDestroyData& aPostDestroyData) {
if (mInner) {
mInner->RemoveListener();
mInner->Disconnect();
mInner->Release();
mInner = nullptr;
}
nsBoxFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
}
nsresult nsSplitterFrame::AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) {
nsresult rv =
nsBoxFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
if (aAttribute == nsGkAtoms::state) {
mInner->UpdateState();
}
return rv;
}
/**
* Initialize us. If we are in a box get our alignment so we know what direction
* we are
*/
void nsSplitterFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
MOZ_ASSERT(!mInner);
mInner = new nsSplitterFrameInner(this);
mInner->AddRef();
// determine orientation of parent, and if vertical, set orient to vertical
// on splitter content, then re-resolve style
// XXXbz this is pretty messed up, since this can change whether we should
// have a frame at all. This really needs a better solution.
if (aParent && aParent->IsXULBoxFrame()) {
if (!aParent->IsXULHorizontal()) {
if (!nsContentUtils::HasNonEmptyAttr(aContent, kNameSpaceID_None,
nsGkAtoms::orient)) {
aContent->AsElement()->SetAttr(kNameSpaceID_None, nsGkAtoms::orient,
NS_LITERAL_STRING("vertical"), false);
}
}
}
nsBoxFrame::Init(aContent, aParent, aPrevInFlow);
mInner->mState = nsSplitterFrameInner::Open;
mInner->AddListener();
mInner->mParentBox = nullptr;
}
NS_IMETHODIMP
nsSplitterFrame::DoXULLayout(nsBoxLayoutState& aState) {
if (GetStateBits() & NS_FRAME_FIRST_REFLOW) {
mInner->mParentBox = nsIFrame::GetParentXULBox(this);
mInner->UpdateState();
}
return nsBoxFrame::DoXULLayout(aState);
}
void nsSplitterFrame::GetInitialOrientation(bool& aIsHorizontal) {
nsIFrame* box = nsIFrame::GetParentXULBox(this);
if (box) {
aIsHorizontal = !box->IsXULHorizontal();
} else
nsBoxFrame::GetInitialOrientation(aIsHorizontal);
}
NS_IMETHODIMP
nsSplitterFrame::HandlePress(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
return NS_OK;
}
NS_IMETHODIMP
nsSplitterFrame::HandleMultiplePress(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus,
bool aControlHeld) {
return NS_OK;
}
NS_IMETHODIMP
nsSplitterFrame::HandleDrag(nsPresContext* aPresContext, WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
return NS_OK;
}
NS_IMETHODIMP
nsSplitterFrame::HandleRelease(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
return NS_OK;
}
void nsSplitterFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
nsBoxFrame::BuildDisplayList(aBuilder, aLists);
// if the mouse is captured always return us as the frame.
if (mInner->mDragging && aBuilder->IsForEventDelivery()) {
// XXX It's probably better not to check visibility here, right?
aLists.Outlines()->AppendNewToTop<nsDisplayEventReceiver>(aBuilder, this);
return;
}
}
nsresult nsSplitterFrame::HandleEvent(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
NS_ENSURE_ARG_POINTER(aEventStatus);
if (nsEventStatus_eConsumeNoDefault == *aEventStatus) {
return NS_OK;
}
AutoWeakFrame weakFrame(this);
RefPtr<nsSplitterFrameInner> inner(mInner);
switch (aEvent->mMessage) {
case eMouseMove:
inner->MouseDrag(aPresContext, aEvent);
break;
case eMouseUp:
if (aEvent->AsMouseEvent()->mButton == MouseButton::eLeft) {
inner->MouseUp(aPresContext, aEvent);
}
break;
default:
break;
}
NS_ENSURE_STATE(weakFrame.IsAlive());
return nsBoxFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
void nsSplitterFrameInner::MouseUp(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent) {
if (mDragging && mOuter) {
AdjustChildren(aPresContext);
AddListener();
PresShell::ReleaseCapturingContent(); // XXXndeakin is this needed?
mDragging = false;
State newState = GetState();
// if the state is dragging then make it Open.
if (newState == Dragging) {
mOuter->mContent->AsElement()->SetAttr(
kNameSpaceID_None, nsGkAtoms::state, EmptyString(), true);
}
mPressed = false;
// if we dragged then fire a command event.
if (mDidDrag) {
RefPtr<nsXULElement> element =
nsXULElement::FromNode(mOuter->GetContent());
element->DoCommand();
}
// printf("MouseUp\n");
}
mChildInfosBefore = nullptr;
mChildInfosAfter = nullptr;
mChildInfosBeforeCount = 0;
mChildInfosAfterCount = 0;
}
void nsSplitterFrameInner::MouseDrag(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent) {
if (mDragging && mOuter) {
// printf("Dragging\n");
bool isHorizontal = !mOuter->IsXULHorizontal();
// convert coord to pixels
nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(
aEvent, RelativeTo{mParentBox});
nscoord pos = isHorizontal ? pt.x : pt.y;
// mDragStart is in frame coordinates
nscoord start = mDragStart;
// take our current position and subtract the start location
pos -= start;
// printf("Diff=%d\n", pos);
ResizeType resizeAfter = GetResizeAfter();
bool bounded;
if (resizeAfter == nsSplitterFrameInner::Grow)
bounded = false;
else
bounded = true;
int i;
for (i = 0; i < mChildInfosBeforeCount; i++)
mChildInfosBefore[i].changed = mChildInfosBefore[i].current;
for (i = 0; i < mChildInfosAfterCount; i++)
mChildInfosAfter[i].changed = mChildInfosAfter[i].current;
nscoord oldPos = pos;
ResizeChildTo(pos, mChildInfosBefore.get(), mChildInfosAfter.get(),
mChildInfosBeforeCount, mChildInfosAfterCount, bounded);
State currentState = GetState();
bool supportsBefore = SupportsCollapseDirection(Before);
bool supportsAfter = SupportsCollapseDirection(After);
const bool isRTL =
mOuter->StyleVisibility()->mDirection == StyleDirection::Rtl;
bool pastEnd = oldPos > 0 && oldPos > pos;
bool pastBegin = oldPos < 0 && oldPos < pos;
if (isRTL) {
// Swap the boundary checks in RTL mode
bool tmp = pastEnd;
pastEnd = pastBegin;
pastBegin = tmp;
}
const bool isCollapsedBefore = pastBegin && supportsBefore;
const bool isCollapsedAfter = pastEnd && supportsAfter;
// if we are in a collapsed position
if (isCollapsedBefore || isCollapsedAfter) {
// and we are not collapsed then collapse
if (currentState == Dragging) {
if (pastEnd) {
// printf("Collapse right\n");
if (supportsAfter) {
RefPtr<Element> outer = mOuter->mContent->AsElement();
outer->SetAttr(kNameSpaceID_None, nsGkAtoms::substate,
NS_LITERAL_STRING("after"), true);
outer->SetAttr(kNameSpaceID_None, nsGkAtoms::state,
NS_LITERAL_STRING("collapsed"), true);
}
} else if (pastBegin) {
// printf("Collapse left\n");
if (supportsBefore) {
RefPtr<Element> outer = mOuter->mContent->AsElement();
outer->SetAttr(kNameSpaceID_None, nsGkAtoms::substate,
NS_LITERAL_STRING("before"), true);
outer->SetAttr(kNameSpaceID_None, nsGkAtoms::state,
NS_LITERAL_STRING("collapsed"), true);
}
}
}
} else {
// if we are not in a collapsed position and we are not dragging make sure
// we are dragging.
if (currentState != Dragging) {
mOuter->mContent->AsElement()->SetAttr(
kNameSpaceID_None, nsGkAtoms::state, NS_LITERAL_STRING("dragging"),
true);
}
AdjustChildren(aPresContext);
}
mDidDrag = true;
}
}
void nsSplitterFrameInner::AddListener() {
mOuter->GetContent()->AddEventListener(NS_LITERAL_STRING("mouseup"), this,
false, false);
mOuter->GetContent()->AddEventListener(NS_LITERAL_STRING("mousedown"), this,
false, false);
mOuter->GetContent()->AddEventListener(NS_LITERAL_STRING("mousemove"), this,
false, false);
mOuter->GetContent()->AddEventListener(NS_LITERAL_STRING("mouseout"), this,
false, false);
}
void nsSplitterFrameInner::RemoveListener() {
NS_ENSURE_TRUE_VOID(mOuter);
mOuter->GetContent()->RemoveEventListener(NS_LITERAL_STRING("mouseup"), this,
false);
mOuter->GetContent()->RemoveEventListener(NS_LITERAL_STRING("mousedown"),
this, false);
mOuter->GetContent()->RemoveEventListener(NS_LITERAL_STRING("mousemove"),
this, false);
mOuter->GetContent()->RemoveEventListener(NS_LITERAL_STRING("mouseout"), this,
false);
}
nsresult nsSplitterFrameInner::HandleEvent(dom::Event* aEvent) {
nsAutoString eventType;
aEvent->GetType(eventType);
if (eventType.EqualsLiteral("mouseup")) return MouseUp(aEvent);
if (eventType.EqualsLiteral("mousedown")) return MouseDown(aEvent);
if (eventType.EqualsLiteral("mousemove") ||
eventType.EqualsLiteral("mouseout"))
return MouseMove(aEvent);
MOZ_ASSERT_UNREACHABLE("Unexpected eventType");
return NS_OK;
}
nsresult nsSplitterFrameInner::MouseUp(Event* aMouseEvent) {
NS_ENSURE_TRUE(mOuter, NS_OK);
mPressed = false;
PresShell::ReleaseCapturingContent();
return NS_OK;
}
nsresult nsSplitterFrameInner::MouseDown(Event* aMouseEvent) {
NS_ENSURE_TRUE(mOuter, NS_OK);
dom::MouseEvent* mouseEvent = aMouseEvent->AsMouseEvent();
if (!mouseEvent) {
return NS_OK;
}
// only if left button
if (mouseEvent->Button() != 0) return NS_OK;
if (SplitterElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::disabled,
nsGkAtoms::_true, eCaseMatters))
return NS_OK;
mParentBox = nsIFrame::GetParentXULBox(mOuter);
if (!mParentBox) return NS_OK;
// get our index
nsPresContext* outerPresContext = mOuter->PresContext();
const nsFrameList& siblingList(mParentBox->PrincipalChildList());
int32_t childIndex = siblingList.IndexOf(mOuter);
// if it's 0 (or not found) then stop right here.
// It might be not found if we're not in the parent's primary frame list.
if (childIndex <= 0) return NS_OK;
int32_t childCount = siblingList.GetLength();
// if it's the last index then we need to allow for resizeafter="grow"
if (childIndex == childCount - 1 && GetResizeAfter() != Grow) return NS_OK;
RefPtr<gfxContext> rc =
outerPresContext->PresShell()->CreateReferenceRenderingContext();
nsBoxLayoutState state(outerPresContext, rc);
mPressed = true;
mDidDrag = false;
EnsureOrient();
bool isHorizontal = !mOuter->IsXULHorizontal();
ResizeType resizeBefore = GetResizeBefore();
ResizeType resizeAfter = GetResizeAfter();
mChildInfosBefore = MakeUnique<nsSplitterInfo[]>(childCount);
mChildInfosAfter = MakeUnique<nsSplitterInfo[]>(childCount);
// create info 2 lists. One of the children before us and one after.
int32_t count = 0;
mChildInfosBeforeCount = 0;
mChildInfosAfterCount = 0;
nsIFrame* childBox = nsIFrame::GetChildXULBox(mParentBox);
while (childBox) {
nsIContent* content = childBox->GetContent();
// skip over any splitters
if (content->NodeInfo()->NameAtom() != nsGkAtoms::splitter) {
nsSize prefSize = childBox->GetXULPrefSize(state);
nsSize minSize = childBox->GetXULMinSize(state);
nsSize maxSize = nsIFrame::XULBoundsCheckMinMax(
minSize, childBox->GetXULMaxSize(state));
prefSize = nsIFrame::XULBoundsCheck(minSize, prefSize, maxSize);
nsSplitterFrame::AddXULMargin(childBox, minSize);
nsSplitterFrame::AddXULMargin(childBox, prefSize);
nsSplitterFrame::AddXULMargin(childBox, maxSize);
nscoord flex = childBox->GetXULFlex();
nsMargin margin(0, 0, 0, 0);
childBox->GetXULMargin(margin);
nsRect r(childBox->GetRect());
r.Inflate(margin);
// We need to check for hidden attribute too, since treecols with
// the hidden="true" attribute are not really hidden, just collapsed
if (!content->IsElement() || (!content->AsElement()->AttrValueIs(
kNameSpaceID_None, nsGkAtoms::fixed,
nsGkAtoms::_true, eCaseMatters) &&
!content->AsElement()->AttrValueIs(
kNameSpaceID_None, nsGkAtoms::hidden,
nsGkAtoms::_true, eCaseMatters))) {
if (count < childIndex && (resizeBefore != Flex || flex > 0)) {
mChildInfosBefore[mChildInfosBeforeCount].childElem = content;
mChildInfosBefore[mChildInfosBeforeCount].min =
isHorizontal ? minSize.width : minSize.height;
mChildInfosBefore[mChildInfosBeforeCount].max =
isHorizontal ? maxSize.width : maxSize.height;
mChildInfosBefore[mChildInfosBeforeCount].current =
isHorizontal ? r.width : r.height;
mChildInfosBefore[mChildInfosBeforeCount].flex = flex;
mChildInfosBefore[mChildInfosBeforeCount].index = count;
mChildInfosBefore[mChildInfosBeforeCount].changed =
mChildInfosBefore[mChildInfosBeforeCount].current;
mChildInfosBeforeCount++;
} else if (count > childIndex && (resizeAfter != Flex || flex > 0)) {
mChildInfosAfter[mChildInfosAfterCount].childElem = content;
mChildInfosAfter[mChildInfosAfterCount].min =
isHorizontal ? minSize.width : minSize.height;
mChildInfosAfter[mChildInfosAfterCount].max =
isHorizontal ? maxSize.width : maxSize.height;
mChildInfosAfter[mChildInfosAfterCount].current =
isHorizontal ? r.width : r.height;
mChildInfosAfter[mChildInfosAfterCount].flex = flex;
mChildInfosAfter[mChildInfosAfterCount].index = count;
mChildInfosAfter[mChildInfosAfterCount].changed =
mChildInfosAfter[mChildInfosAfterCount].current;
mChildInfosAfterCount++;
}
}
}
childBox = nsIFrame::GetNextXULBox(childBox);
count++;
}
if (!mParentBox->IsXULNormalDirection()) {
// The before array is really the after array, and the order needs to be
// reversed. First reverse both arrays.
Reverse(mChildInfosBefore, mChildInfosBeforeCount);
Reverse(mChildInfosAfter, mChildInfosAfterCount);
// Now swap the two arrays.
std::swap(mChildInfosBeforeCount, mChildInfosAfterCount);
std::swap(mChildInfosBefore, mChildInfosAfter);
}
// if resizebefore is not Farthest, reverse the list because the first child
// in the list is the farthest, and we want the first child to be the closest.
if (resizeBefore != Farthest)
Reverse(mChildInfosBefore, mChildInfosBeforeCount);
// if the resizeafter is the Farthest we must reverse the list because the
// first child in the list is the closest we want the first child to be the
// Farthest.
if (resizeAfter == Farthest) Reverse(mChildInfosAfter, mChildInfosAfterCount);
// grow only applys to the children after. If grow is set then no space should
// be taken out of any children after us. To do this we just set the size of
// that list to be 0.
if (resizeAfter == Grow) mChildInfosAfterCount = 0;
int32_t c;
nsPoint pt =
nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(mouseEvent, mParentBox);
if (isHorizontal) {
c = pt.x;
mSplitterPos = mOuter->mRect.x;
} else {
c = pt.y;
mSplitterPos = mOuter->mRect.y;
}
mDragStart = c;
// printf("Pressed mDragStart=%d\n",mDragStart);
PresShell::SetCapturingContent(mOuter->GetContent(),
CaptureFlags::IgnoreAllowedState);
return NS_OK;
}
nsresult nsSplitterFrameInner::MouseMove(Event* aMouseEvent) {
NS_ENSURE_TRUE(mOuter, NS_OK);
if (!mPressed) return NS_OK;
if (mDragging) return NS_OK;
nsCOMPtr<nsIDOMEventListener> kungfuDeathGrip(this);
mOuter->mContent->AsElement()->SetAttr(kNameSpaceID_None, nsGkAtoms::state,
NS_LITERAL_STRING("dragging"), true);
RemoveListener();
mDragging = true;
return NS_OK;
}
void nsSplitterFrameInner::Reverse(UniquePtr<nsSplitterInfo[]>& aChildInfos,
int32_t aCount) {
UniquePtr<nsSplitterInfo[]> infos(new nsSplitterInfo[aCount]);
for (int i = 0; i < aCount; i++) infos[i] = aChildInfos[aCount - 1 - i];
aChildInfos = std::move(infos);
}
bool nsSplitterFrameInner::SupportsCollapseDirection(
nsSplitterFrameInner::CollapseDirection aDirection) {
static Element::AttrValuesArray strings[] = {
nsGkAtoms::before, nsGkAtoms::after, nsGkAtoms::both, nullptr};
switch (SplitterElement()->FindAttrValueIn(
kNameSpaceID_None, nsGkAtoms::collapse, strings, eCaseMatters)) {
case 0:
return (aDirection == Before);
case 1:
return (aDirection == After);
case 2:
return true;
}
return false;
}
void nsSplitterFrameInner::UpdateState() {
// State Transitions:
// Open -> Dragging
// Open -> CollapsedBefore
// Open -> CollapsedAfter
// CollapsedBefore -> Open
// CollapsedBefore -> Dragging
// CollapsedAfter -> Open
// CollapsedAfter -> Dragging
// Dragging -> Open
// Dragging -> CollapsedBefore (auto collapse)
// Dragging -> CollapsedAfter (auto collapse)
State newState = GetState();
if (newState == mState) {
// No change.
return;
}
if ((SupportsCollapseDirection(Before) || SupportsCollapseDirection(After)) &&
mOuter->GetParent()->IsXULBoxFrame()) {
// Find the splitter's immediate sibling.
nsIFrame* splitterSibling;
if (newState == CollapsedBefore || mState == CollapsedBefore) {
splitterSibling = mOuter->GetPrevSibling();
} else {
splitterSibling = mOuter->GetNextSibling();
}
if (splitterSibling) {
nsCOMPtr<nsIContent> sibling = splitterSibling->GetContent();
if (sibling && sibling->IsElement()) {
if (mState == CollapsedBefore || mState == CollapsedAfter) {
// CollapsedBefore -> Open
// CollapsedBefore -> Dragging
// CollapsedAfter -> Open
// CollapsedAfter -> Dragging
nsContentUtils::AddScriptRunner(new nsUnsetAttrRunnable(
sibling->AsElement(), nsGkAtoms::collapsed));
} else if ((mState == Open || mState == Dragging) &&
(newState == CollapsedBefore ||
newState == CollapsedAfter)) {
// Open -> CollapsedBefore / CollapsedAfter
// Dragging -> CollapsedBefore / CollapsedAfter
nsContentUtils::AddScriptRunner(
new nsSetAttrRunnable(sibling->AsElement(), nsGkAtoms::collapsed,
NS_LITERAL_STRING("true")));
}
}
}
}
mState = newState;
}
void nsSplitterFrameInner::EnsureOrient() {
bool isHorizontal = !(mParentBox->GetStateBits() & NS_STATE_IS_HORIZONTAL);
if (isHorizontal)
mOuter->AddStateBits(NS_STATE_IS_HORIZONTAL);
else
mOuter->RemoveStateBits(NS_STATE_IS_HORIZONTAL);
}
void nsSplitterFrameInner::AdjustChildren(nsPresContext* aPresContext) {
EnsureOrient();
bool isHorizontal = !mOuter->IsXULHorizontal();
AdjustChildren(aPresContext, mChildInfosBefore.get(), mChildInfosBeforeCount,
isHorizontal);
AdjustChildren(aPresContext, mChildInfosAfter.get(), mChildInfosAfterCount,
isHorizontal);
}
static nsIFrame* GetChildBoxForContent(nsIFrame* aParentBox,
nsIContent* aContent) {
nsIFrame* childBox = nsIFrame::GetChildXULBox(aParentBox);
while (nullptr != childBox) {
if (childBox->GetContent() == aContent) {
return childBox;
}
childBox = nsIFrame::GetNextXULBox(childBox);
}
return nullptr;
}
void nsSplitterFrameInner::AdjustChildren(nsPresContext* aPresContext,
nsSplitterInfo* aChildInfos,
int32_t aCount, bool aIsHorizontal) {
/// printf("------- AdjustChildren------\n");
nsBoxLayoutState state(aPresContext);
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
// first set all the widths.
nsIFrame* child = nsIFrame::GetChildXULBox(mOuter);
while (child) {
SetPreferredSize(state, child, onePixel, aIsHorizontal, nullptr);
child = nsIFrame::GetNextXULBox(child);
}
// now set our changed widths.
for (int i = 0; i < aCount; i++) {
nscoord pref = aChildInfos[i].changed;
nsIFrame* childBox =
GetChildBoxForContent(mParentBox, aChildInfos[i].childElem);
if (childBox) {
SetPreferredSize(state, childBox, onePixel, aIsHorizontal, &pref);
}
}
}
void nsSplitterFrameInner::SetPreferredSize(nsBoxLayoutState& aState,
nsIFrame* aChildBox,
nscoord aOnePixel,
bool aIsHorizontal,
nscoord* aSize) {
nsRect rect(aChildBox->GetRect());
nscoord pref = 0;
if (!aSize) {
if (aIsHorizontal)
pref = rect.width;
else
pref = rect.height;
} else {
pref = *aSize;
}
nsMargin margin(0, 0, 0, 0);
aChildBox->GetXULMargin(margin);
RefPtr<nsAtom> attribute;
if (aIsHorizontal) {
pref -= (margin.left + margin.right);
attribute = nsGkAtoms::width;
} else {
pref -= (margin.top + margin.bottom);
attribute = nsGkAtoms::height;
}
nsIContent* content = aChildBox->GetContent();
if (!content->IsElement()) {
return;
}
// set its preferred size.
nsAutoString prefValue;
prefValue.AppendInt(pref / aOnePixel);
if (content->AsElement()->AttrValueIs(kNameSpaceID_None, attribute, prefValue,
eCaseMatters)) {
return;
}
AutoWeakFrame weakBox(aChildBox);
content->AsElement()->SetAttr(kNameSpaceID_None, attribute, prefValue, true);
NS_ENSURE_TRUE_VOID(weakBox.IsAlive());
aState.PresShell()->FrameNeedsReflow(aChildBox, IntrinsicDirty::StyleChange,
NS_FRAME_IS_DIRTY);
}
void nsSplitterFrameInner::AddRemoveSpace(nscoord aDiff,
nsSplitterInfo* aChildInfos,
int32_t aCount, int32_t& aSpaceLeft) {
aSpaceLeft = 0;
for (int i = 0; i < aCount; i++) {
nscoord min = aChildInfos[i].min;
nscoord max = aChildInfos[i].max;
nscoord& c = aChildInfos[i].changed;
// figure our how much space to add or remove
if (c + aDiff < min) {
aDiff += (c - min);
c = min;
} else if (c + aDiff > max) {
aDiff -= (max - c);
c = max;
} else {
c += aDiff;
aDiff = 0;
}
// there is not space left? We are done
if (aDiff == 0) break;
}
aSpaceLeft = aDiff;
}
/**
* Ok if we want to resize a child we will know the actual size in pixels we
* want it to be. This is not the preferred size. But they only way we can
* change a child is my manipulating its preferred size. So give the actual
* pixel size this return method will return figure out the preferred size and
* set it.
*/
void nsSplitterFrameInner::ResizeChildTo(nscoord& aDiff,
nsSplitterInfo* aChildrenBeforeInfos,
nsSplitterInfo* aChildrenAfterInfos,
int32_t aChildrenBeforeCount,
int32_t aChildrenAfterCount,
bool aBounded) {
nscoord spaceLeft;
AddRemoveSpace(aDiff, aChildrenBeforeInfos, aChildrenBeforeCount, spaceLeft);
// if there is any space left over remove it from the dif we were originally
// given
aDiff -= spaceLeft;
AddRemoveSpace(-aDiff, aChildrenAfterInfos, aChildrenAfterCount, spaceLeft);
if (spaceLeft != 0) {
if (aBounded) {
aDiff += spaceLeft;
AddRemoveSpace(spaceLeft, aChildrenBeforeInfos, aChildrenBeforeCount,
spaceLeft);
}
}
}
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