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gecko-dev
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gecko-dev/editor/libeditor/HTMLAbsPositionEditor.cpp

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26 KiB
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/* 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/. */
#include "HTMLEditor.h"
#include <math.h>
#include "HTMLEditorEventListener.h"
#include "HTMLEditUtils.h"
#include "mozilla/EditAction.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/dom/AncestorIterator.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/EventTarget.h"
#include "mozilla/mozalloc.h"
#include "nsAString.h"
#include "nsAlgorithm.h"
#include "nsCOMPtr.h"
#include "nsComputedDOMStyle.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsROCSSPrimitiveValue.h"
#include "nsINode.h"
#include "nsIPrincipal.h"
#include "nsISupportsImpl.h"
#include "nsISupportsUtils.h"
#include "nsLiteralString.h"
#include "nsReadableUtils.h"
#include "nsString.h"
#include "nsStringFwd.h"
#include "nscore.h"
#include <algorithm>
namespace mozilla {
using namespace dom;
nsresult HTMLEditor::SetSelectionToAbsoluteOrStaticAsAction(
bool aEnabled, nsIPrincipal* aPrincipal) {
MOZ_ASSERT(IsEditActionDataAvailable());
AutoEditActionDataSetter editActionData(
*this, EditAction::eSetPositionToAbsoluteOrStatic, aPrincipal);
nsresult rv = editActionData.CanHandleAndMaybeDispatchBeforeInputEvent();
if (NS_FAILED(rv)) {
NS_WARNING_ASSERTION(rv == NS_ERROR_EDITOR_ACTION_CANCELED,
"CanHandleAndMaybeDispatchBeforeInputEvent(), failed");
return rv;
}
if (aEnabled) {
EditActionResult result = SetSelectionToAbsoluteAsSubAction();
NS_WARNING_ASSERTION(
result.Succeeded(),
"HTMLEditor::SetSelectionToAbsoluteAsSubAction() failed");
return result.Rv();
}
EditActionResult result = SetSelectionToStaticAsSubAction();
NS_WARNING_ASSERTION(result.Succeeded(),
"HTMLEditor::SetSelectionToStaticAsSubAction() failed");
return result.Rv();
}
already_AddRefed<Element>
HTMLEditor::GetAbsolutelyPositionedSelectionContainer() const {
AutoEditActionDataSetter editActionData(*this, EditAction::eNotEditing);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return nullptr;
}
Element* selectionContainerElement = GetSelectionContainerElement();
if (NS_WARN_IF(!selectionContainerElement)) {
return nullptr;
}
AutoTArray<RefPtr<Element>, 24> arrayOfParentElements;
for (Element* element :
InclusiveAncestorsOfType<Element>(*selectionContainerElement)) {
arrayOfParentElements.AppendElement(element);
}
nsAutoString positionValue;
for (RefPtr<Element> element = selectionContainerElement; element;
element = element->GetParentElement()) {
if (element->IsHTMLElement(nsGkAtoms::html)) {
NS_WARNING(
"HTMLEditor::GetAbsolutelyPositionedSelectionContainer() reached "
"<html> element");
return nullptr;
}
nsCOMPtr<nsINode> parentNode = element->GetParentNode();
nsresult rv = CSSEditUtils::GetComputedProperty(
MOZ_KnownLive(*element), *nsGkAtoms::position, positionValue);
if (NS_FAILED(rv)) {
NS_WARNING(
"CSSEditUtils::GetComputedProperty(nsGkAtoms::position) failed");
return nullptr;
}
if (NS_WARN_IF(Destroyed()) ||
NS_WARN_IF(parentNode != element->GetParentNode())) {
return nullptr;
}
if (positionValue.EqualsLiteral("absolute")) {
return element.forget();
}
}
return nullptr;
}
NS_IMETHODIMP HTMLEditor::GetAbsolutePositioningEnabled(bool* aIsEnabled) {
*aIsEnabled = IsAbsolutePositionEditorEnabled();
return NS_OK;
}
NS_IMETHODIMP HTMLEditor::SetAbsolutePositioningEnabled(bool aIsEnabled) {
EnableAbsolutePositionEditor(aIsEnabled);
return NS_OK;
}
nsresult HTMLEditor::RelativeChangeElementZIndex(Element& aElement,
int32_t aChange,
int32_t* aReturn) {
if (NS_WARN_IF(!aReturn)) {
return NS_ERROR_INVALID_ARG;
}
if (!aChange) {
return NS_OK;
}
int32_t zIndex = GetZIndex(aElement);
if (NS_WARN_IF(Destroyed())) {
return NS_ERROR_EDITOR_DESTROYED;
}
zIndex = std::max(zIndex + aChange, 0);
SetZIndex(aElement, zIndex);
*aReturn = zIndex;
return NS_WARN_IF(Destroyed()) ? NS_ERROR_EDITOR_DESTROYED : NS_OK;
}
void HTMLEditor::SetZIndex(Element& aElement, int32_t aZIndex) {
nsAutoString zIndexValue;
zIndexValue.AppendInt(aZIndex);
DebugOnly<nsresult> rvIgnored =
mCSSEditUtils->SetCSSProperty(aElement, *nsGkAtoms::z_index, zIndexValue);
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::SetCSSProperty(nsGkAtoms::z_index) failed, but ignored");
}
nsresult HTMLEditor::AddZIndexAsAction(int32_t aChange,
nsIPrincipal* aPrincipal) {
MOZ_ASSERT(IsEditActionDataAvailable());
AutoEditActionDataSetter editActionData(
*this, EditAction::eIncreaseOrDecreaseZIndex, aPrincipal);
nsresult rv = editActionData.CanHandleAndMaybeDispatchBeforeInputEvent();
if (NS_FAILED(rv)) {
NS_WARNING_ASSERTION(rv == NS_ERROR_EDITOR_ACTION_CANCELED,
"CanHandleAndMaybeDispatchBeforeInputEvent(), failed");
return EditorBase::ToGenericNSResult(rv);
}
EditActionResult result = AddZIndexAsSubAction(aChange);
NS_WARNING_ASSERTION(result.Succeeded(),
"HTMLEditor::AddZIndexAsSubAction() failed");
return EditorBase::ToGenericNSResult(result.Rv());
}
int32_t HTMLEditor::GetZIndex(Element& aElement) {
AutoEditActionDataSetter editActionData(*this, EditAction::eNotEditing);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return 0;
}
nsAutoString zIndexValue;
nsresult rv = CSSEditUtils::GetSpecifiedProperty(
aElement, *nsGkAtoms::z_index, zIndexValue);
if (NS_FAILED(rv)) {
NS_WARNING("CSSEditUtils::GetSpecifiedProperty(nsGkAtoms::z_index) failed");
return 0;
}
if (zIndexValue.EqualsLiteral("auto")) {
if (!aElement.GetParentElement()) {
NS_WARNING("aElement was an orphan node or the root node");
return 0;
}
// we have to look at the positioned ancestors
// cf. CSS 2 spec section 9.9.1
nsAutoString positionValue;
for (RefPtr<Element> element = aElement.GetParentElement(); element;
element = element->GetParentElement()) {
if (element->IsHTMLElement(nsGkAtoms::body)) {
return 0;
}
nsCOMPtr<nsINode> parentNode = element->GetParentElement();
nsresult rv = CSSEditUtils::GetComputedProperty(
*element, *nsGkAtoms::position, positionValue);
if (NS_FAILED(rv)) {
NS_WARNING(
"CSSEditUtils::GetComputedProperty(nsGkAtoms::position) failed");
return 0;
}
if (NS_WARN_IF(Destroyed()) ||
NS_WARN_IF(parentNode != element->GetParentNode())) {
return 0;
}
if (!positionValue.EqualsLiteral("absolute")) {
continue;
}
// ah, we found one, what's its z-index ? If its z-index is auto,
// we have to continue climbing the document's tree
rv = CSSEditUtils::GetComputedProperty(*element, *nsGkAtoms::z_index,
zIndexValue);
if (NS_FAILED(rv)) {
NS_WARNING(
"CSSEditUtils::GetComputedProperty(nsGkAtoms::z_index) failed");
return 0;
}
if (NS_WARN_IF(Destroyed()) ||
NS_WARN_IF(parentNode != element->GetParentNode())) {
return 0;
}
if (!zIndexValue.EqualsLiteral("auto")) {
break;
}
}
}
if (zIndexValue.EqualsLiteral("auto")) {
return 0;
}
nsresult rvIgnored;
int32_t result = zIndexValue.ToInteger(&rvIgnored);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"nsAString::ToInteger() failed, but ignored");
return result;
}
bool HTMLEditor::CreateGrabberInternal(nsIContent& aParentContent) {
if (NS_WARN_IF(mGrabber)) {
return false;
}
mGrabber = CreateAnonymousElement(nsGkAtoms::span, aParentContent,
NS_LITERAL_STRING("mozGrabber"), false);
// mGrabber may be destroyed during creation due to there may be
// mutation event listener.
if (!mGrabber) {
NS_WARNING(
"HTMLEditor::CreateAnonymousElement(nsGkAtoms::span, mozGrabber) "
"failed");
return false;
}
EventListenerManager* eventListenerManager =
mGrabber->GetOrCreateListenerManager();
eventListenerManager->AddEventListenerByType(
mEventListener, NS_LITERAL_STRING("mousedown"),
TrustedEventsAtSystemGroupBubble());
MOZ_ASSERT(mGrabber);
return true;
}
NS_IMETHODIMP HTMLEditor::RefreshGrabber() {
if (NS_WARN_IF(!mAbsolutelyPositionedObject)) {
return NS_ERROR_FAILURE;
}
AutoEditActionDataSetter editActionData(*this, EditAction::eNotEditing);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return NS_ERROR_NOT_INITIALIZED;
}
nsresult rv = RefreshGrabberInternal();
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
"HTMLEditor::RefreshGrabberInternal() failed");
return EditorBase::ToGenericNSResult(rv);
}
nsresult HTMLEditor::RefreshGrabberInternal() {
if (!mAbsolutelyPositionedObject) {
return NS_OK;
}
OwningNonNull<Element> absolutelyPositionedObject =
*mAbsolutelyPositionedObject;
nsresult rv = GetPositionAndDimensions(
absolutelyPositionedObject, mPositionedObjectX, mPositionedObjectY,
mPositionedObjectWidth, mPositionedObjectHeight,
mPositionedObjectBorderLeft, mPositionedObjectBorderTop,
mPositionedObjectMarginLeft, mPositionedObjectMarginTop);
if (NS_FAILED(rv)) {
NS_WARNING("HTMLEditor::GetPositionAndDimensions() failed");
return rv;
}
if (NS_WARN_IF(absolutelyPositionedObject != mAbsolutelyPositionedObject)) {
return NS_ERROR_FAILURE;
}
RefPtr<Element> grabber = mGrabber.get();
MOZ_ASSERT(grabber);
SetAnonymousElementPosition(mPositionedObjectX + 12, mPositionedObjectY - 14,
grabber);
if (NS_WARN_IF(Destroyed())) {
return NS_ERROR_EDITOR_DESTROYED;
}
if (NS_WARN_IF(grabber != mGrabber.get())) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
void HTMLEditor::HideGrabberInternal() {
if (NS_WARN_IF(!mAbsolutelyPositionedObject)) {
return;
}
// Move all members to the local variables first since mutation event
// listener may try to show grabber while we're hiding them.
RefPtr<Element> absolutePositioningObject =
std::move(mAbsolutelyPositionedObject);
ManualNACPtr grabber = std::move(mGrabber);
ManualNACPtr positioningShadow = std::move(mPositioningShadow);
DebugOnly<nsresult> rv = absolutePositioningObject->UnsetAttr(
kNameSpaceID_None, nsGkAtoms::_moz_abspos, true);
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rv),
"Element::UnsetAttr(nsGkAtoms::_moz_abspos) failed, but ignored");
// We allow the pres shell to be null; when it is, we presume there
// are no document observers to notify, but we still want to
// UnbindFromTree.
RefPtr<PresShell> presShell = GetPresShell();
if (grabber) {
DeleteRefToAnonymousNode(std::move(grabber), presShell);
}
if (positioningShadow) {
DeleteRefToAnonymousNode(std::move(positioningShadow), presShell);
}
}
nsresult HTMLEditor::ShowGrabberInternal(Element& aElement) {
if (NS_WARN_IF(!IsDescendantOfEditorRoot(&aElement))) {
return NS_ERROR_UNEXPECTED;
}
if (NS_WARN_IF(mGrabber)) {
return NS_ERROR_UNEXPECTED;
}
nsAutoString classValue;
nsresult rv =
GetTemporaryStyleForFocusedPositionedElement(aElement, classValue);
if (NS_FAILED(rv)) {
NS_WARNING(
"HTMLEditor::GetTemporaryStyleForFocusedPositionedElement() failed");
return rv;
}
rv = aElement.SetAttr(kNameSpaceID_None, nsGkAtoms::_moz_abspos, classValue,
true);
if (NS_FAILED(rv)) {
NS_WARNING("Element::SetAttr(nsGkAtoms::_moz_abspos) failed");
return rv;
}
mAbsolutelyPositionedObject = &aElement;
Element* parentElement = aElement.GetParentElement();
if (NS_WARN_IF(!parentElement)) {
return NS_ERROR_FAILURE;
}
if (!CreateGrabberInternal(*parentElement)) {
NS_WARNING("HTMLEditor::CreateGrabberInternal() failed");
return NS_ERROR_FAILURE;
}
// If we succeeded to create the grabber, HideGrabberInternal() hasn't been
// called yet. So, mAbsolutelyPositionedObject should be non-nullptr.
MOZ_ASSERT(mAbsolutelyPositionedObject);
// Finally, move the grabber to proper position.
rv = RefreshGrabberInternal();
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
"HTMLEditor::RefereshGrabberInternal() failed");
return rv;
}
nsresult HTMLEditor::StartMoving() {
RefPtr<Element> parentElement = mGrabber->GetParentElement();
if (NS_WARN_IF(!parentElement) || NS_WARN_IF(!mAbsolutelyPositionedObject)) {
return NS_ERROR_FAILURE;
}
// now, let's create the resizing shadow
mPositioningShadow =
CreateShadow(*parentElement, *mAbsolutelyPositionedObject);
if (!mPositioningShadow) {
NS_WARNING("HTMLEditor::CreateShadow() failed");
return NS_ERROR_FAILURE;
}
if (!mAbsolutelyPositionedObject) {
NS_WARNING("The target has gone during HTMLEditor::CreateShadow()");
return NS_ERROR_FAILURE;
}
RefPtr<Element> positioningShadow = mPositioningShadow.get();
RefPtr<Element> absolutelyPositionedObject = mAbsolutelyPositionedObject;
nsresult rv =
SetShadowPosition(*positioningShadow, *absolutelyPositionedObject,
mPositionedObjectX, mPositionedObjectY);
if (NS_FAILED(rv)) {
NS_WARNING("HTMLEditor::SetShadowPosition() failed");
return rv;
}
// make the shadow appear
DebugOnly<nsresult> rvIgnored =
mPositioningShadow->UnsetAttr(kNameSpaceID_None, nsGkAtoms::_class, true);
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rvIgnored),
"Element::UnsetAttr(nsGkAtoms::_class) failed, but ignored");
// position it
positioningShadow = mPositioningShadow.get();
rvIgnored = mCSSEditUtils->SetCSSPropertyPixels(
*positioningShadow, *nsGkAtoms::width, mPositionedObjectWidth);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::SetCSSPropertyPixels(nsGkAtoms::width) "
"failed, but ignored");
rvIgnored = mCSSEditUtils->SetCSSPropertyPixels(
*positioningShadow, *nsGkAtoms::height, mPositionedObjectHeight);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::SetCSSPropertyPixels(nsGkAtoms::height) "
"failed, but ignored");
mIsMoving = true;
return NS_OK; // XXX Looks like nobody refers this result
}
void HTMLEditor::SnapToGrid(int32_t& newX, int32_t& newY) {
if (mSnapToGridEnabled && mGridSize) {
newX = (int32_t)floor(((float)newX / (float)mGridSize) + 0.5f) * mGridSize;
newY = (int32_t)floor(((float)newY / (float)mGridSize) + 0.5f) * mGridSize;
}
}
nsresult HTMLEditor::GrabberClicked() {
if (NS_WARN_IF(!mEventListener)) {
return NS_ERROR_NOT_INITIALIZED;
}
nsresult rv = static_cast<HTMLEditorEventListener*>(mEventListener.get())
->ListenToMouseMoveEventForGrabber(true);
if (NS_FAILED(rv)) {
NS_WARNING(
"HTMLEditorEventListener::ListenToMouseMoveEventForGrabber(true) "
"failed, but ignored");
return NS_OK;
}
mGrabberClicked = true;
return NS_OK;
}
nsresult HTMLEditor::EndMoving() {
if (mPositioningShadow) {
RefPtr<PresShell> presShell = GetPresShell();
if (NS_WARN_IF(!presShell)) {
return NS_ERROR_NOT_INITIALIZED;
}
DeleteRefToAnonymousNode(std::move(mPositioningShadow), presShell);
mPositioningShadow = nullptr;
}
if (mEventListener) {
DebugOnly<nsresult> rvIgnored =
static_cast<HTMLEditorEventListener*>(mEventListener.get())
->ListenToMouseMoveEventForGrabber(false);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"HTMLEditorEventListener::"
"ListenToMouseMoveEventForGrabber(false) failed");
}
mGrabberClicked = false;
mIsMoving = false;
nsresult rv = RefreshEditingUI();
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
"HTMLEditor::RefreshEditingUI() failed");
return rv;
}
nsresult HTMLEditor::SetFinalPosition(int32_t aX, int32_t aY) {
nsresult rv = EndMoving();
if (NS_FAILED(rv)) {
NS_WARNING("HTMLEditor::EndMoving() failed");
return rv;
}
// we have now to set the new width and height of the resized object
// we don't set the x and y position because we don't control that in
// a normal HTML layout
int32_t newX = mPositionedObjectX + aX - mOriginalX -
(mPositionedObjectBorderLeft + mPositionedObjectMarginLeft);
int32_t newY = mPositionedObjectY + aY - mOriginalY -
(mPositionedObjectBorderTop + mPositionedObjectMarginTop);
SnapToGrid(newX, newY);
nsAutoString x, y;
x.AppendInt(newX);
y.AppendInt(newY);
// we want one transaction only from a user's point of view
AutoPlaceholderBatch treatAsOneTransaction(*this);
if (NS_WARN_IF(!mAbsolutelyPositionedObject)) {
return NS_ERROR_FAILURE;
}
OwningNonNull<Element> absolutelyPositionedObject =
*mAbsolutelyPositionedObject;
DebugOnly<nsresult> rvIgnored = NS_OK;
rvIgnored = mCSSEditUtils->SetCSSPropertyPixels(*absolutelyPositionedObject,
*nsGkAtoms::top, newY);
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::SetCSSPropertyPixels(nsGkAtoms::top) failed, but ignored");
rvIgnored = mCSSEditUtils->SetCSSPropertyPixels(*absolutelyPositionedObject,
*nsGkAtoms::left, newX);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::SetCSSPropertyPixels(nsGkAtoms::left) "
"failed, but ignored");
// keep track of that size
mPositionedObjectX = newX;
mPositionedObjectY = newY;
rv = RefreshResizers();
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
"HTMLEditor::RefreshResizers() failed");
return rv;
}
void HTMLEditor::AddPositioningOffset(int32_t& aX, int32_t& aY) {
// Get the positioning offset
int32_t positioningOffset =
Preferences::GetInt("editor.positioning.offset", 0);
aX += positioningOffset;
aY += positioningOffset;
}
nsresult HTMLEditor::SetPositionToAbsoluteOrStatic(Element& aElement,
bool aEnabled) {
nsAutoString positionValue;
DebugOnly<nsresult> rvIgnored = CSSEditUtils::GetComputedProperty(
aElement, *nsGkAtoms::position, positionValue);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::GetComputedProperty(nsGkAtoms::position) "
"failed, but ignored");
// nothing to do if the element is already in the state we want
if (positionValue.EqualsLiteral("absolute") == aEnabled) {
return NS_OK;
}
if (aEnabled) {
nsresult rv = SetPositionToAbsolute(aElement);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
"HTMLEditor::SetPositionToAbsolute() failed");
return rv;
}
nsresult rv = SetPositionToStatic(aElement);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
"HTMLEditor::SetPositionToStatic() failed");
return rv;
}
nsresult HTMLEditor::SetPositionToAbsolute(Element& aElement) {
MOZ_ASSERT(IsEditActionDataAvailable());
AutoPlaceholderBatch treatAsOneTransaction(*this);
int32_t x, y;
DebugOnly<nsresult> rvIgnored = GetElementOrigin(aElement, x, y);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"HTMLEditor::GetElementOrigin() failed, but ignored");
rvIgnored = mCSSEditUtils->SetCSSProperty(aElement, *nsGkAtoms::position,
NS_LITERAL_STRING("absolute"));
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::SetCSSProperty(nsGkAtoms::position, "
"absolute) failed, but ignored");
AddPositioningOffset(x, y);
SnapToGrid(x, y);
SetTopAndLeft(aElement, x, y);
// we may need to create a br if the positioned element is alone in its
// container
nsINode* parentNode = aElement.GetParentNode();
if (parentNode->GetChildCount() != 1) {
return NS_OK;
}
RefPtr<Element> newBRElement =
InsertBRElementWithTransaction(EditorDOMPoint(parentNode, 0));
NS_WARNING_ASSERTION(newBRElement,
"HTMLEditor::InsertBRElementWithTransaction() failed");
return newBRElement ? NS_OK : NS_ERROR_FAILURE;
}
nsresult HTMLEditor::SetPositionToStatic(Element& aElement) {
AutoPlaceholderBatch treatAsOneTransaction(*this);
DebugOnly<nsresult> rvIgnored = NS_OK;
rvIgnored = mCSSEditUtils->RemoveCSSProperty(aElement, *nsGkAtoms::position,
EmptyString());
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::RemoveCSSProperty(nsGkAtoms::position) "
"failed, but ignored");
rvIgnored = mCSSEditUtils->RemoveCSSProperty(aElement, *nsGkAtoms::top,
EmptyString());
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::RemoveCSSProperty(nsGkAtoms::top) "
"failed, but ignored");
rvIgnored = mCSSEditUtils->RemoveCSSProperty(aElement, *nsGkAtoms::left,
EmptyString());
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::RemoveCSSProperty(nsGkAtoms::left) "
"failed, but ignored");
rvIgnored = mCSSEditUtils->RemoveCSSProperty(aElement, *nsGkAtoms::z_index,
EmptyString());
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::RemoveCSSProperty(nsGkAtoms::z_index) "
"failed, but ignored");
if (!HTMLEditUtils::IsImage(&aElement)) {
rvIgnored = mCSSEditUtils->RemoveCSSProperty(aElement, *nsGkAtoms::width,
EmptyString());
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::RemoveCSSProperty(nsGkAtoms::width) "
"failed, but ignored");
rvIgnored = mCSSEditUtils->RemoveCSSProperty(aElement, *nsGkAtoms::height,
EmptyString());
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::RemoveCSSProperty(nsGkAtoms::height) "
"failed, but ignored");
}
if (!aElement.IsHTMLElement(nsGkAtoms::div) ||
HTMLEditor::HasStyleOrIdOrClassAttribute(aElement)) {
return NS_OK;
}
// Make sure the first fild and last child of aElement starts/ends hard
// line(s) even after removing `aElement`.
nsresult rv = EnsureHardLineBeginsWithFirstChildOf(aElement);
if (NS_FAILED(rv)) {
NS_WARNING("HTMLEditor::EnsureHardLineBeginsWithFirstChildOf() failed");
return rv;
}
rv = EnsureHardLineEndsWithLastChildOf(aElement);
if (NS_FAILED(rv)) {
NS_WARNING("HTMLEditor::EnsureHardLineEndsWithLastChildOf() failed");
return rv;
}
rv = RemoveContainerWithTransaction(aElement);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
"EditorBase::RemoveContainerWithTransaction() failed");
return rv;
}
NS_IMETHODIMP HTMLEditor::SetSnapToGridEnabled(bool aEnabled) {
mSnapToGridEnabled = aEnabled;
return NS_OK;
}
NS_IMETHODIMP HTMLEditor::GetSnapToGridEnabled(bool* aIsEnabled) {
*aIsEnabled = mSnapToGridEnabled;
return NS_OK;
}
NS_IMETHODIMP HTMLEditor::SetGridSize(uint32_t aSize) {
mGridSize = aSize;
return NS_OK;
}
NS_IMETHODIMP HTMLEditor::GetGridSize(uint32_t* aSize) {
*aSize = mGridSize;
return NS_OK;
}
// self-explanatory
void HTMLEditor::SetTopAndLeft(Element& aElement, int32_t aX, int32_t aY) {
AutoPlaceholderBatch treatAsOneTransaction(*this);
DebugOnly<nsresult> rvIgnored = NS_OK;
rvIgnored =
mCSSEditUtils->SetCSSPropertyPixels(aElement, *nsGkAtoms::left, aX);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::SetCSSPropertyPixels(nsGkAtoms::left) "
"failed, but ignored");
rvIgnored =
mCSSEditUtils->SetCSSPropertyPixels(aElement, *nsGkAtoms::top, aY);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"CSSEditUtils::SetCSSPropertyPixels(nsGkAtoms::top) "
"failed, but ignored");
}
nsresult HTMLEditor::GetTemporaryStyleForFocusedPositionedElement(
Element& aElement, nsAString& aReturn) {
// we are going to outline the positioned element and bring it to the
// front to overlap any other element intersecting with it. But
// first, let's see what's the background and foreground colors of the
// positioned element.
// if background-image computed value is 'none,
// If the background color is 'auto' and R G B values of the foreground are
// each above #d0, use a black background
// If the background color is 'auto' and at least one of R G B values of
// the foreground is below #d0, use a white background
// Otherwise don't change background/foreground
aReturn.Truncate();
nsAutoString backgroundImageValue;
nsresult rv = CSSEditUtils::GetComputedProperty(
aElement, *nsGkAtoms::background_image, backgroundImageValue);
if (NS_FAILED(rv)) {
NS_WARNING(
"CSSEditUtils::GetComputedProperty(nsGkAtoms::background_image) "
"failed");
return rv;
}
if (!backgroundImageValue.EqualsLiteral("none")) {
return NS_OK;
}
nsAutoString backgroundColorValue;
rv = CSSEditUtils::GetComputedProperty(aElement, *nsGkAtoms::backgroundColor,
backgroundColorValue);
if (NS_FAILED(rv)) {
NS_WARNING(
"CSSEditUtils::GetComputedProperty(nsGkAtoms::backgroundColor) "
"failed");
return rv;
}
if (!backgroundColorValue.EqualsLiteral("rgba(0, 0, 0, 0)")) {
return NS_OK;
}
RefPtr<ComputedStyle> style =
nsComputedDOMStyle::GetComputedStyle(&aElement, nullptr);
if (NS_WARN_IF(Destroyed())) {
return NS_ERROR_EDITOR_DESTROYED;
}
if (!style) {
NS_WARNING("nsComputedDOMStyle::GetComputedStyle() failed");
return NS_ERROR_FAILURE;
}
static const uint8_t kBlackBgTrigger = 0xd0;
const auto& color = style->StyleText()->mColor;
if (color.red >= kBlackBgTrigger && color.green >= kBlackBgTrigger &&
color.blue >= kBlackBgTrigger) {
aReturn.AssignLiteral("black");
} else {
aReturn.AssignLiteral("white");
}
return NS_OK;
}
} // namespace mozilla
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