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gecko-dev/editor/libeditor/nsHTMLAbsPosition.cpp
Aryeh Gregor 7547add233 Bug 1056166 part 5 - Clean up ChangeCSSInlineStyleTxn; r=ehsan 
--HG--
rename : editor/libeditor/ChangeCSSInlineStyleTxn.cpp => editor/libeditor/ChangeStyleTxn.cpp
rename : editor/libeditor/ChangeCSSInlineStyleTxn.h => editor/libeditor/ChangeStyleTxn.h
2014-08-29 14:43:24 +03:00

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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 <math.h>
#include "mozilla/Preferences.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/dom/Element.h"
#include "mozilla/mozalloc.h"
#include "nsAString.h"
#include "nsAlgorithm.h"
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsComputedDOMStyle.h"
#include "nsDebug.h"
#include "nsEditRules.h"
#include "nsEditor.h"
#include "nsEditorUtils.h"
#include "nsError.h"
#include "nsGkAtoms.h"
#include "nsHTMLCSSUtils.h"
#include "nsHTMLEditRules.h"
#include "nsHTMLEditUtils.h"
#include "nsHTMLEditor.h"
#include "nsHTMLObjectResizer.h"
#include "nsIContent.h"
#include "nsROCSSPrimitiveValue.h"
#include "nsIDOMCSSStyleDeclaration.h"
#include "nsIDOMElement.h"
#include "nsIDOMEventListener.h"
#include "nsIDOMEventTarget.h"
#include "nsIDOMNode.h"
#include "nsDOMCSSRGBColor.h"
#include "nsIDOMWindow.h"
#include "nsIEditor.h"
#include "nsIHTMLEditor.h"
#include "nsIHTMLObjectResizer.h"
#include "nsINode.h"
#include "nsIPresShell.h"
#include "nsISelection.h"
#include "nsISupportsImpl.h"
#include "nsISupportsUtils.h"
#include "nsLiteralString.h"
#include "nsReadableUtils.h"
#include "nsString.h"
#include "nsStringFwd.h"
#include "nsTextEditRules.h"
#include "nsTextEditUtils.h"
#include "nscore.h"
#include <algorithm>
using namespace mozilla;
using namespace mozilla::dom;
#define BLACK_BG_RGB_TRIGGER 0xd0
NS_IMETHODIMP
nsHTMLEditor::AbsolutePositionSelection(bool aEnabled)
{
nsAutoEditBatch beginBatching(this);
nsAutoRules beginRulesSniffing(this,
aEnabled ? EditAction::setAbsolutePosition :
EditAction::removeAbsolutePosition,
nsIEditor::eNext);
// the line below does not match the code; should it be removed?
// Find out if the selection is collapsed:
nsRefPtr<Selection> selection = GetSelection();
NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
nsTextRulesInfo ruleInfo(aEnabled ? EditAction::setAbsolutePosition :
EditAction::removeAbsolutePosition);
bool cancel, handled;
// Protect the edit rules object from dying
nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
nsresult res = mRules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
if (NS_FAILED(res) || cancel)
return res;
return mRules->DidDoAction(selection, &ruleInfo, res);
}
NS_IMETHODIMP
nsHTMLEditor::GetAbsolutelyPositionedSelectionContainer(nsIDOMElement **_retval)
{
nsCOMPtr<nsIDOMElement> element;
nsresult res = GetSelectionContainer(getter_AddRefs(element));
NS_ENSURE_SUCCESS(res, res);
nsAutoString positionStr;
nsCOMPtr<nsIDOMNode> node = do_QueryInterface(element);
nsCOMPtr<nsIDOMNode> resultNode;
while (!resultNode && node && !nsEditor::NodeIsType(node, nsGkAtoms::html)) {
res = mHTMLCSSUtils->GetComputedProperty(node, nsGkAtoms::position,
positionStr);
NS_ENSURE_SUCCESS(res, res);
if (positionStr.EqualsLiteral("absolute"))
resultNode = node;
else {
nsCOMPtr<nsIDOMNode> parentNode;
res = node->GetParentNode(getter_AddRefs(parentNode));
NS_ENSURE_SUCCESS(res, res);
node.swap(parentNode);
}
}
element = do_QueryInterface(resultNode );
*_retval = element;
NS_IF_ADDREF(*_retval);
return NS_OK;
}
NS_IMETHODIMP
nsHTMLEditor::GetSelectionContainerAbsolutelyPositioned(bool *aIsSelectionContainerAbsolutelyPositioned)
{
*aIsSelectionContainerAbsolutelyPositioned = (mAbsolutelyPositionedObject != nullptr);
return NS_OK;
}
NS_IMETHODIMP
nsHTMLEditor::GetAbsolutePositioningEnabled(bool * aIsEnabled)
{
*aIsEnabled = mIsAbsolutelyPositioningEnabled;
return NS_OK;
}
NS_IMETHODIMP
nsHTMLEditor::SetAbsolutePositioningEnabled(bool aIsEnabled)
{
mIsAbsolutelyPositioningEnabled = aIsEnabled;
return NS_OK;
}
NS_IMETHODIMP
nsHTMLEditor::RelativeChangeElementZIndex(nsIDOMElement * aElement,
int32_t aChange,
int32_t * aReturn)
{
NS_ENSURE_ARG_POINTER(aElement);
NS_ENSURE_ARG_POINTER(aReturn);
if (!aChange) // early way out, no change
return NS_OK;
int32_t zIndex;
nsresult res = GetElementZIndex(aElement, &zIndex);
NS_ENSURE_SUCCESS(res, res);
zIndex = std::max(zIndex + aChange, 0);
SetElementZIndex(aElement, zIndex);
*aReturn = zIndex;
return NS_OK;
}
NS_IMETHODIMP
nsHTMLEditor::SetElementZIndex(nsIDOMElement* aElement, int32_t aZindex)
{
nsCOMPtr<Element> element = do_QueryInterface(aElement);
NS_ENSURE_ARG_POINTER(element);
nsAutoString zIndexStr;
zIndexStr.AppendInt(aZindex);
mHTMLCSSUtils->SetCSSProperty(*element, *nsGkAtoms::z_index, zIndexStr);
return NS_OK;
}
NS_IMETHODIMP
nsHTMLEditor::RelativeChangeZIndex(int32_t aChange)
{
nsAutoEditBatch beginBatching(this);
nsAutoRules beginRulesSniffing(this,
(aChange < 0) ? EditAction::decreaseZIndex :
EditAction::increaseZIndex,
nsIEditor::eNext);
// brade: can we get rid of this comment?
// Find out if the selection is collapsed:
nsRefPtr<Selection> selection = GetSelection();
NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
nsTextRulesInfo ruleInfo(aChange < 0 ? EditAction::decreaseZIndex :
EditAction::increaseZIndex);
bool cancel, handled;
// Protect the edit rules object from dying
nsCOMPtr<nsIEditRules> kungFuDeathGrip(mRules);
nsresult res = mRules->WillDoAction(selection, &ruleInfo, &cancel, &handled);
if (cancel || NS_FAILED(res))
return res;
return mRules->DidDoAction(selection, &ruleInfo, res);
}
NS_IMETHODIMP
nsHTMLEditor::GetElementZIndex(nsIDOMElement * aElement,
int32_t * aZindex)
{
nsAutoString zIndexStr;
*aZindex = 0;
nsresult res = mHTMLCSSUtils->GetSpecifiedProperty(aElement,
nsGkAtoms::z_index,
zIndexStr);
NS_ENSURE_SUCCESS(res, res);
if (zIndexStr.EqualsLiteral("auto")) {
// we have to look at the positioned ancestors
// cf. CSS 2 spec section 9.9.1
nsCOMPtr<nsIDOMNode> parentNode;
res = aElement->GetParentNode(getter_AddRefs(parentNode));
NS_ENSURE_SUCCESS(res, res);
nsCOMPtr<nsIDOMNode> node = parentNode;
nsAutoString positionStr;
while (node &&
zIndexStr.EqualsLiteral("auto") &&
!nsTextEditUtils::IsBody(node)) {
res = mHTMLCSSUtils->GetComputedProperty(node, nsGkAtoms::position,
positionStr);
NS_ENSURE_SUCCESS(res, res);
if (positionStr.EqualsLiteral("absolute")) {
// ah, we found one, what's its z-index ? If its z-index is auto,
// we have to continue climbing the document's tree
res = mHTMLCSSUtils->GetComputedProperty(node, nsGkAtoms::z_index,
zIndexStr);
NS_ENSURE_SUCCESS(res, res);
}
res = node->GetParentNode(getter_AddRefs(parentNode));
NS_ENSURE_SUCCESS(res, res);
node = parentNode;
}
}
if (!zIndexStr.EqualsLiteral("auto")) {
nsresult errorCode;
*aZindex = zIndexStr.ToInteger(&errorCode);
}
return NS_OK;
}
nsresult
nsHTMLEditor::CreateGrabber(nsIDOMNode * aParentNode, nsIDOMElement ** aReturn)
{
// let's create a grabber through the element factory
nsresult res = CreateAnonymousElement(NS_LITERAL_STRING("span"),
aParentNode,
NS_LITERAL_STRING("mozGrabber"),
false,
aReturn);
NS_ENSURE_TRUE(*aReturn, NS_ERROR_FAILURE);
// add the mouse listener so we can detect a click on a resizer
nsCOMPtr<nsIDOMEventTarget> evtTarget(do_QueryInterface(*aReturn));
evtTarget->AddEventListener(NS_LITERAL_STRING("mousedown"),
mEventListener, false);
return res;
}
NS_IMETHODIMP
nsHTMLEditor::RefreshGrabber()
{
NS_ENSURE_TRUE(mAbsolutelyPositionedObject, NS_ERROR_NULL_POINTER);
nsresult res = GetPositionAndDimensions(mAbsolutelyPositionedObject,
mPositionedObjectX,
mPositionedObjectY,
mPositionedObjectWidth,
mPositionedObjectHeight,
mPositionedObjectBorderLeft,
mPositionedObjectBorderTop,
mPositionedObjectMarginLeft,
mPositionedObjectMarginTop);
NS_ENSURE_SUCCESS(res, res);
SetAnonymousElementPosition(mPositionedObjectX+12,
mPositionedObjectY-14,
mGrabber);
return NS_OK;
}
NS_IMETHODIMP
nsHTMLEditor::HideGrabber()
{
nsresult res =
mAbsolutelyPositionedObject->RemoveAttribute(NS_LITERAL_STRING("_moz_abspos"));
NS_ENSURE_SUCCESS(res, res);
mAbsolutelyPositionedObject = nullptr;
NS_ENSURE_TRUE(mGrabber, NS_ERROR_NULL_POINTER);
// get the presshell's document observer interface.
nsCOMPtr<nsIPresShell> ps = GetPresShell();
// 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.
nsCOMPtr<nsIDOMNode> parentNode;
res = mGrabber->GetParentNode(getter_AddRefs(parentNode));
NS_ENSURE_SUCCESS(res, res);
nsCOMPtr<nsIContent> parentContent = do_QueryInterface(parentNode);
NS_ENSURE_TRUE(parentContent, NS_ERROR_NULL_POINTER);
DeleteRefToAnonymousNode(mGrabber, parentContent, ps);
mGrabber = nullptr;
DeleteRefToAnonymousNode(mPositioningShadow, parentContent, ps);
mPositioningShadow = nullptr;
return NS_OK;
}
NS_IMETHODIMP
nsHTMLEditor::ShowGrabberOnElement(nsIDOMElement * aElement)
{
NS_ENSURE_ARG_POINTER(aElement);
if (mGrabber) {
NS_ERROR("call HideGrabber first");
return NS_ERROR_UNEXPECTED;
}
nsAutoString classValue;
nsresult res = CheckPositionedElementBGandFG(aElement, classValue);
NS_ENSURE_SUCCESS(res, res);
res = aElement->SetAttribute(NS_LITERAL_STRING("_moz_abspos"),
classValue);
NS_ENSURE_SUCCESS(res, res);
// first, let's keep track of that element...
mAbsolutelyPositionedObject = aElement;
nsCOMPtr<nsIDOMNode> parentNode;
res = aElement->GetParentNode(getter_AddRefs(parentNode));
NS_ENSURE_SUCCESS(res, res);
res = CreateGrabber(parentNode, getter_AddRefs(mGrabber));
NS_ENSURE_SUCCESS(res, res);
// and set its position
return RefreshGrabber();
}
nsresult
nsHTMLEditor::StartMoving(nsIDOMElement *aHandle)
{
nsCOMPtr<nsIDOMNode> parentNode;
nsresult res = mGrabber->GetParentNode(getter_AddRefs(parentNode));
NS_ENSURE_SUCCESS(res, res);
// now, let's create the resizing shadow
res = CreateShadow(getter_AddRefs(mPositioningShadow),
parentNode, mAbsolutelyPositionedObject);
NS_ENSURE_SUCCESS(res,res);
res = SetShadowPosition(mPositioningShadow, mAbsolutelyPositionedObject,
mPositionedObjectX, mPositionedObjectY);
NS_ENSURE_SUCCESS(res,res);
// make the shadow appear
mPositioningShadow->RemoveAttribute(NS_LITERAL_STRING("class"));
// position it
mHTMLCSSUtils->SetCSSPropertyPixels(mPositioningShadow,
NS_LITERAL_STRING("width"),
mPositionedObjectWidth);
mHTMLCSSUtils->SetCSSPropertyPixels(mPositioningShadow,
NS_LITERAL_STRING("height"),
mPositionedObjectHeight);
mIsMoving = true;
return res;
}
void
nsHTMLEditor::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
nsHTMLEditor::GrabberClicked()
{
// add a mouse move listener to the editor
nsresult res = NS_OK;
if (!mMouseMotionListenerP) {
mMouseMotionListenerP = new ResizerMouseMotionListener(this);
if (!mMouseMotionListenerP) {return NS_ERROR_NULL_POINTER;}
nsCOMPtr<nsIDOMEventTarget> piTarget = GetDOMEventTarget();
NS_ENSURE_TRUE(piTarget, NS_ERROR_FAILURE);
res = piTarget->AddEventListener(NS_LITERAL_STRING("mousemove"),
mMouseMotionListenerP,
false, false);
NS_ASSERTION(NS_SUCCEEDED(res),
"failed to register mouse motion listener");
}
mGrabberClicked = true;
return res;
}
nsresult
nsHTMLEditor::EndMoving()
{
if (mPositioningShadow) {
nsCOMPtr<nsIPresShell> ps = GetPresShell();
NS_ENSURE_TRUE(ps, NS_ERROR_NOT_INITIALIZED);
nsCOMPtr<nsIDOMNode> parentNode;
nsresult res = mGrabber->GetParentNode(getter_AddRefs(parentNode));
NS_ENSURE_SUCCESS(res, res);
nsCOMPtr<nsIContent> parentContent( do_QueryInterface(parentNode) );
NS_ENSURE_TRUE(parentContent, NS_ERROR_FAILURE);
DeleteRefToAnonymousNode(mPositioningShadow, parentContent, ps);
mPositioningShadow = nullptr;
}
nsCOMPtr<nsIDOMEventTarget> piTarget = GetDOMEventTarget();
if (piTarget && mMouseMotionListenerP) {
#ifdef DEBUG
nsresult res =
#endif
piTarget->RemoveEventListener(NS_LITERAL_STRING("mousemove"),
mMouseMotionListenerP,
false);
NS_ASSERTION(NS_SUCCEEDED(res), "failed to remove mouse motion listener");
}
mMouseMotionListenerP = nullptr;
mGrabberClicked = false;
mIsMoving = false;
nsCOMPtr<nsISelection> selection;
GetSelection(getter_AddRefs(selection));
if (!selection) {
return NS_ERROR_NOT_INITIALIZED;
}
return CheckSelectionStateForAnonymousButtons(selection);
}
nsresult
nsHTMLEditor::SetFinalPosition(int32_t aX, int32_t aY)
{
nsresult res = EndMoving();
NS_ENSURE_SUCCESS(res, res);
// 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
nsAutoEditBatch batchIt(this);
nsCOMPtr<Element> absolutelyPositionedObject =
do_QueryInterface(mAbsolutelyPositionedObject);
NS_ENSURE_STATE(absolutelyPositionedObject);
mHTMLCSSUtils->SetCSSPropertyPixels(*absolutelyPositionedObject,
*nsGkAtoms::top, newY);
mHTMLCSSUtils->SetCSSPropertyPixels(*absolutelyPositionedObject,
*nsGkAtoms::left, newX);
// keep track of that size
mPositionedObjectX = newX;
mPositionedObjectY = newY;
return RefreshResizers();
}
void
nsHTMLEditor::AddPositioningOffset(int32_t & aX, int32_t & aY)
{
// Get the positioning offset
int32_t positioningOffset =
Preferences::GetInt("editor.positioning.offset", 0);
aX += positioningOffset;
aY += positioningOffset;
}
NS_IMETHODIMP
nsHTMLEditor::AbsolutelyPositionElement(nsIDOMElement* aElement,
bool aEnabled)
{
nsCOMPtr<Element> element = do_QueryInterface(aElement);
NS_ENSURE_ARG_POINTER(element);
nsAutoString positionStr;
mHTMLCSSUtils->GetComputedProperty(aElement, nsGkAtoms::position,
positionStr);
bool isPositioned = (positionStr.EqualsLiteral("absolute"));
// nothing to do if the element is already in the state we want
if (isPositioned == aEnabled)
return NS_OK;
nsAutoEditBatch batchIt(this);
if (aEnabled) {
int32_t x, y;
GetElementOrigin(aElement, x, y);
mHTMLCSSUtils->SetCSSProperty(*element, *nsGkAtoms::position,
NS_LITERAL_STRING("absolute"));
AddPositioningOffset(x, y);
SnapToGrid(x, y);
SetElementPosition(aElement, x, y);
// we may need to create a br if the positioned element is alone in its
// container
nsCOMPtr<nsINode> element = do_QueryInterface(aElement);
NS_ENSURE_STATE(element);
nsINode* parentNode = element->GetParentNode();
if (parentNode->GetChildCount() == 1) {
nsCOMPtr<nsIDOMNode> brNode;
nsresult res = CreateBR(parentNode->AsDOMNode(), 0, address_of(brNode));
NS_ENSURE_SUCCESS(res, res);
}
}
else {
mHTMLCSSUtils->RemoveCSSProperty(*element, *nsGkAtoms::position,
EmptyString());
mHTMLCSSUtils->RemoveCSSProperty(*element, *nsGkAtoms::top,
EmptyString());
mHTMLCSSUtils->RemoveCSSProperty(*element, *nsGkAtoms::left,
EmptyString());
mHTMLCSSUtils->RemoveCSSProperty(*element, *nsGkAtoms::z_index,
EmptyString());
if (!nsHTMLEditUtils::IsImage(aElement)) {
mHTMLCSSUtils->RemoveCSSProperty(*element, *nsGkAtoms::width,
EmptyString());
mHTMLCSSUtils->RemoveCSSProperty(*element, *nsGkAtoms::height,
EmptyString());
}
nsCOMPtr<dom::Element> element = do_QueryInterface(aElement);
if (element && element->IsHTML(nsGkAtoms::div) && !HasStyleOrIdOrClass(element)) {
nsRefPtr<nsHTMLEditRules> htmlRules = static_cast<nsHTMLEditRules*>(mRules.get());
NS_ENSURE_TRUE(htmlRules, NS_ERROR_FAILURE);
nsresult res = htmlRules->MakeSureElemStartsOrEndsOnCR(aElement);
NS_ENSURE_SUCCESS(res, res);
res = RemoveContainer(element);
NS_ENSURE_SUCCESS(res, res);
}
}
return NS_OK;
}
NS_IMETHODIMP
nsHTMLEditor::SetSnapToGridEnabled(bool aEnabled)
{
mSnapToGridEnabled = aEnabled;
return NS_OK;
}
NS_IMETHODIMP
nsHTMLEditor::GetSnapToGridEnabled(bool * aIsEnabled)
{
*aIsEnabled = mSnapToGridEnabled;
return NS_OK;
}
NS_IMETHODIMP
nsHTMLEditor::SetGridSize(uint32_t aSize)
{
mGridSize = aSize;
return NS_OK;
}
NS_IMETHODIMP
nsHTMLEditor::GetGridSize(uint32_t * aSize)
{
*aSize = mGridSize;
return NS_OK;
}
// self-explanatory
NS_IMETHODIMP
nsHTMLEditor::SetElementPosition(nsIDOMElement *aElement, int32_t aX, int32_t aY)
{
nsCOMPtr<Element> element = do_QueryInterface(aElement);
NS_ENSURE_STATE(element);
nsAutoEditBatch batchIt(this);
mHTMLCSSUtils->SetCSSPropertyPixels(*element, *nsGkAtoms::left, aX);
mHTMLCSSUtils->SetCSSPropertyPixels(*element, *nsGkAtoms::top, aY);
return NS_OK;
}
// self-explanatory
NS_IMETHODIMP
nsHTMLEditor::GetPositionedElement(nsIDOMElement ** aReturn)
{
*aReturn = mAbsolutelyPositionedObject;
NS_IF_ADDREF(*aReturn);
return NS_OK;
}
nsresult
nsHTMLEditor::CheckPositionedElementBGandFG(nsIDOMElement * 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 bgImageStr;
nsresult res =
mHTMLCSSUtils->GetComputedProperty(aElement, nsGkAtoms::background_image,
bgImageStr);
NS_ENSURE_SUCCESS(res, res);
if (bgImageStr.EqualsLiteral("none")) {
nsAutoString bgColorStr;
res =
mHTMLCSSUtils->GetComputedProperty(aElement, nsGkAtoms::backgroundColor,
bgColorStr);
NS_ENSURE_SUCCESS(res, res);
if (bgColorStr.EqualsLiteral("transparent")) {
nsRefPtr<nsComputedDOMStyle> cssDecl =
mHTMLCSSUtils->GetComputedStyle(aElement);
NS_ENSURE_STATE(cssDecl);
// from these declarations, get the one we want and that one only
ErrorResult error;
nsRefPtr<dom::CSSValue> cssVal = cssDecl->GetPropertyCSSValue(NS_LITERAL_STRING("color"), error);
NS_ENSURE_SUCCESS(error.ErrorCode(), error.ErrorCode());
nsROCSSPrimitiveValue* val = cssVal->AsPrimitiveValue();
NS_ENSURE_TRUE(val, NS_ERROR_FAILURE);
if (nsIDOMCSSPrimitiveValue::CSS_RGBCOLOR == val->PrimitiveType()) {
nsDOMCSSRGBColor* rgbVal = val->GetRGBColorValue(error);
NS_ENSURE_SUCCESS(error.ErrorCode(), error.ErrorCode());
float r = rgbVal->Red()->
GetFloatValue(nsIDOMCSSPrimitiveValue::CSS_NUMBER, error);
NS_ENSURE_SUCCESS(error.ErrorCode(), error.ErrorCode());
float g = rgbVal->Green()->
GetFloatValue(nsIDOMCSSPrimitiveValue::CSS_NUMBER, error);
NS_ENSURE_SUCCESS(error.ErrorCode(), error.ErrorCode());
float b = rgbVal->Blue()->
GetFloatValue(nsIDOMCSSPrimitiveValue::CSS_NUMBER, error);
NS_ENSURE_SUCCESS(error.ErrorCode(), error.ErrorCode());
if (r >= BLACK_BG_RGB_TRIGGER &&
g >= BLACK_BG_RGB_TRIGGER &&
b >= BLACK_BG_RGB_TRIGGER)
aReturn.AssignLiteral("black");
else
aReturn.AssignLiteral("white");
return NS_OK;
}
}
}
return NS_OK;
}
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