gecko-dev/layout/forms/nsColorControlFrame.cpp

/* -*- 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/. */

#include "nsColorControlFrame.h"

#include "nsContentCreatorFunctions.h"
#include "nsContentUtils.h"
#include "nsCSSPseudoElements.h"
#include "nsCheckboxRadioFrame.h"
#include "nsGkAtoms.h"
#include "nsIDOMNode.h"
#include "nsIFormControl.h"
#include "mozilla/StyleSetHandle.h"
#include "mozilla/StyleSetHandleInlines.h"
#include "mozilla/dom/HTMLInputElement.h"
#include "nsIDocument.h"

using mozilla::dom::Element;
using mozilla::dom::HTMLInputElement;
using mozilla::dom::CallerType;

nsColorControlFrame::nsColorControlFrame(nsStyleContext* aContext)
  : nsHTMLButtonControlFrame(aContext, kClassID)
{
}

nsIFrame*
NS_NewColorControlFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsColorControlFrame(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsColorControlFrame)

NS_QUERYFRAME_HEAD(nsColorControlFrame)
  NS_QUERYFRAME_ENTRY(nsColorControlFrame)
  NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_TAIL_INHERITING(nsHTMLButtonControlFrame)


void nsColorControlFrame::DestroyFrom(nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData)
{
  nsCheckboxRadioFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);
  aPostDestroyData.AddAnonymousContent(mColorContent.forget());
  nsHTMLButtonControlFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
}

#ifdef DEBUG_FRAME_DUMP
nsresult
nsColorControlFrame::GetFrameName(nsAString& aResult) const
{
  return MakeFrameName(NS_LITERAL_STRING("ColorControl"), aResult);
}
#endif

// Create the color area for the button.
// The frame will be generated by the frame constructor.
nsresult
nsColorControlFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
{
  nsCOMPtr<nsIDocument> doc = mContent->GetComposedDoc();
  mColorContent = doc->CreateHTMLElement(nsGkAtoms::div);
  mColorContent->SetPseudoElementType(CSSPseudoElementType::mozColorSwatch);

  // Mark the element to be native anonymous before setting any attributes.
  mColorContent->SetIsNativeAnonymousRoot();

  nsresult rv = UpdateColor();
  NS_ENSURE_SUCCESS(rv, rv);

  if (!aElements.AppendElement(mColorContent)) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  return NS_OK;
}

void
nsColorControlFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
                                              uint32_t aFilter)
{
  if (mColorContent) {
    aElements.AppendElement(mColorContent);
  }
}

nsresult
nsColorControlFrame::UpdateColor()
{
  // Get the color from the "value" property of our content; it will return the
  // default color (through the sanitization algorithm) if the value is empty.
  nsAutoString color;
  HTMLInputElement* elt = HTMLInputElement::FromContent(mContent);
  elt->GetValue(color, CallerType::System);

  if (color.IsEmpty()) {
    // OK, there is one case the color string might be empty -- if our content
    // is still being created, i.e. if it has mDoneCreating==false.  In that
    // case, we simply do nothing, because we'll be called again with a complete
    // content node before we ever reflow or paint. Specifically: we can expect
    // that HTMLInputElement::DoneCreatingElement() will set mDoneCreating to
    // true (which enables sanitization) and then it'll call SetValueInternal(),
    // which produces a nonempty color (via sanitization), and then it'll call
    // this function here, and we'll get the nonempty default color.
    MOZ_ASSERT(HasAnyStateBits(NS_FRAME_FIRST_REFLOW),
               "Content node's GetValue() should return a valid color string "
               "by the time we've been reflowed (the default color, in case "
               "no valid color is set)");
    return NS_OK;
  }

  // Set the background-color CSS property of the swatch element to this color.
  return mColorContent->SetAttr(kNameSpaceID_None, nsGkAtoms::style,
                                NS_LITERAL_STRING("background-color:") + color,
                                /* aNotify */ true);
}

nsresult
nsColorControlFrame::AttributeChanged(int32_t  aNameSpaceID,
                                      nsAtom* aAttribute,
                                      int32_t  aModType)
{
  NS_ASSERTION(mColorContent, "The color div must exist");

  // If the value attribute is set, update the color box, but only if we're
  // still a color control, which might not be the case if the type attribute
  // was removed/changed.
  nsCOMPtr<nsIFormControl> fctrl = do_QueryInterface(GetContent());
  if (fctrl->ControlType() == NS_FORM_INPUT_COLOR &&
      aNameSpaceID == kNameSpaceID_None && nsGkAtoms::value == aAttribute) {
    UpdateColor();
  }
  return nsHTMLButtonControlFrame::AttributeChanged(aNameSpaceID, aAttribute,
                                                    aModType);
}

nsContainerFrame*
nsColorControlFrame::GetContentInsertionFrame()
{
  return this;
}

Element*
nsColorControlFrame::GetPseudoElement(CSSPseudoElementType aType)
{
  if (aType == CSSPseudoElementType::mozColorSwatch) {
    return mColorContent;
  }

  return nsContainerFrame::GetPseudoElement(aType);
}