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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
#include "ChromeObserver.h"
#include "nsIBaseWindow.h"
#include "nsIWidget.h"
#include "nsIFrame.h"
#include "nsContentUtils.h"
#include "nsView.h"
#include "nsPresContext.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/MutationEventBinding.h"
#include "nsXULElement.h"
namespace mozilla::dom {
NS_IMPL_ISUPPORTS(ChromeObserver, nsIMutationObserver)
ChromeObserver::ChromeObserver(Document* aDocument)
: nsStubMutationObserver(), mDocument(aDocument) {}
ChromeObserver::~ChromeObserver() = default;
void ChromeObserver::Init() {
mDocument->AddMutationObserver(this);
Element* rootElement = mDocument->GetRootElement();
if (!rootElement) {
return;
}
nsAutoScriptBlocker scriptBlocker;
uint32_t attributeCount = rootElement->GetAttrCount();
for (uint32_t i = 0; i < attributeCount; i++) {
BorrowedAttrInfo info = rootElement->GetAttrInfoAt(i);
const nsAttrName* name = info.mName;
if (name->LocalName() == nsGkAtoms::chromemargin) {
// Some linux windows managers have an issue when the chrome margin is
// applying this attribute when initializing.
continue;
}
AttributeChanged(rootElement, name->NamespaceID(), name->LocalName(),
MutationEvent_Binding::ADDITION, nullptr);
}
}
nsIWidget* ChromeObserver::GetWindowWidget() {
// only top level chrome documents can set the titlebar color
if (mDocument && mDocument->IsRootDisplayDocument()) {
nsCOMPtr<nsISupports> container = mDocument->GetContainer();
nsCOMPtr<nsIBaseWindow> baseWindow = do_QueryInterface(container);
if (baseWindow) {
nsCOMPtr<nsIWidget> mainWidget;
baseWindow->GetMainWidget(getter_AddRefs(mainWidget));
return mainWidget;
}
}
return nullptr;
}
void ChromeObserver::SetDrawsTitle(bool aState) {
nsIWidget* mainWidget = GetWindowWidget();
if (mainWidget) {
// We can do this synchronously because SetDrawsTitle doesn't have any
// synchronous effects apart from a harmless invalidation.
mainWidget->SetDrawsTitle(aState);
}
}
class MarginSetter : public Runnable {
public:
explicit MarginSetter(nsIWidget* aWidget)
: mozilla::Runnable("MarginSetter"),
mWidget(aWidget),
mMargin(-1, -1, -1, -1) {}
MarginSetter(nsIWidget* aWidget, const LayoutDeviceIntMargin& aMargin)
: mozilla::Runnable("MarginSetter"), mWidget(aWidget), mMargin(aMargin) {}
NS_IMETHOD Run() override {
// SetNonClientMargins can dispatch native events, hence doing
// it off a script runner.
mWidget->SetNonClientMargins(mMargin);
return NS_OK;
}
private:
nsCOMPtr<nsIWidget> mWidget;
LayoutDeviceIntMargin mMargin;
};
void ChromeObserver::SetChromeMargins(const nsAttrValue* aValue) {
if (!aValue) return;
nsIWidget* mainWidget = GetWindowWidget();
if (!mainWidget) return;
// top, right, bottom, left - see nsAttrValue
nsAutoString tmp;
aValue->ToString(tmp);
nsIntMargin margins;
if (nsContentUtils::ParseIntMarginValue(tmp, margins)) {
nsContentUtils::AddScriptRunner(new MarginSetter(
mainWidget, LayoutDeviceIntMargin::FromUnknownMargin(margins)));
}
}
void ChromeObserver::AttributeChanged(dom::Element* aElement,
int32_t aNamespaceID, nsAtom* aName,
int32_t aModType,
const nsAttrValue* aOldValue) {
// We only care about changes to the root element.
if (!mDocument || aElement != mDocument->GetRootElement()) {
return;
}
const nsAttrValue* value = aElement->GetParsedAttr(aName, aNamespaceID);
if (value) {
// Hide chrome if needed
if (aName == nsGkAtoms::hidechrome) {
HideWindowChrome(value->Equals(u"true"_ns, eCaseMatters));
} else if (aName == nsGkAtoms::chromemargin) {
SetChromeMargins(value);
}
// title and drawintitlebar are settable on
// any root node (windows, dialogs, etc)
else if (aName == nsGkAtoms::title) {
mDocument->NotifyPossibleTitleChange(false);
} else if (aName == nsGkAtoms::drawtitle) {
SetDrawsTitle(value->Equals(u"true"_ns, eCaseMatters));
} else if (aName == nsGkAtoms::localedir) {
// if the localedir changed on the root element, reset the document
// direction
mDocument->ResetDocumentDirection();
}
} else {
if (aName == nsGkAtoms::hidechrome) {
HideWindowChrome(false);
} else if (aName == nsGkAtoms::chromemargin) {
ResetChromeMargins();
} else if (aName == nsGkAtoms::localedir) {
// if the localedir changed on the root element, reset the document
// direction
mDocument->ResetDocumentDirection();
} else if (aName == nsGkAtoms::drawtitle) {
SetDrawsTitle(false);
}
}
}
void ChromeObserver::NodeWillBeDestroyed(nsINode* aNode) {
mDocument = nullptr;
}
void ChromeObserver::ResetChromeMargins() {
nsIWidget* mainWidget = GetWindowWidget();
if (!mainWidget) return;
// See nsIWidget
nsContentUtils::AddScriptRunner(new MarginSetter(mainWidget));
}
nsresult ChromeObserver::HideWindowChrome(bool aShouldHide) {
// only top level chrome documents can hide the window chrome
if (!mDocument->IsRootDisplayDocument()) return NS_OK;
nsPresContext* presContext = mDocument->GetPresContext();
if (presContext && presContext->IsChrome()) {
nsIFrame* frame = mDocument->GetDocumentElement()->GetPrimaryFrame();
if (frame) {
nsView* view = frame->GetClosestView();
if (view) {
nsIWidget* w = view->GetWidget();
NS_ENSURE_STATE(w);
w->HideWindowChrome(aShouldHide);
}
}
}
return NS_OK;
}
} // namespace mozilla::dom