gecko/layout/inspector/src/inFlasher.cpp

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Joe Hewitt <hewitt@netscape.com> (original author)
 *   Christopher A. Aillon <christopher@aillon.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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#include "inFlasher.h"
#include "inLayoutUtils.h"

#include "nsIServiceManager.h"
#include "nsIPresShell.h"
#include "nsIFrame.h"
#include "nsReadableUtils.h"

#include "prprf.h"

///////////////////////////////////////////////////////////////////////////////

inFlasher::inFlasher() :
  mColor(NS_RGB(0,0,0)),
  mThickness(0),
  mInvert(PR_FALSE)
{
}

inFlasher::~inFlasher()
{
}

NS_IMPL_ISUPPORTS1(inFlasher, inIFlasher)

///////////////////////////////////////////////////////////////////////////////
// inIFlasher

NS_IMETHODIMP
inFlasher::GetColor(nsAString& aColor)
{
  // Copied from nsGenericHTMLElement::ColorToString()
  char buf[10];
  PR_snprintf(buf, sizeof(buf), "#%02x%02x%02x",
              NS_GET_R(mColor), NS_GET_G(mColor), NS_GET_B(mColor));
  CopyASCIItoUTF16(buf, aColor);

  return NS_OK;
}

NS_IMETHODIMP
inFlasher::SetColor(const nsAString& aColor)
{
  NS_ENSURE_FALSE(aColor.IsEmpty(), NS_ERROR_ILLEGAL_VALUE);

  nsAutoString colorStr;
  colorStr.Assign(aColor);

  if (colorStr.CharAt(0) != '#') {
    if (NS_ColorNameToRGB(colorStr, &mColor)) {
      return NS_OK;
    }
  }
  else {
    colorStr.Cut(0, 1);
    if (NS_HexToRGB(colorStr, &mColor)) {
      return NS_OK;
    }
  }

  return NS_ERROR_ILLEGAL_VALUE;
}

NS_IMETHODIMP
inFlasher::GetThickness(PRUint16 *aThickness)
{
  NS_PRECONDITION(aThickness, "Null pointer");
  *aThickness = mThickness;
  return NS_OK;
}

NS_IMETHODIMP
inFlasher::SetThickness(PRUint16 aThickness)
{
  mThickness = aThickness;
  return NS_OK;
}

NS_IMETHODIMP
inFlasher::GetInvert(PRBool *aInvert)
{
  NS_PRECONDITION(aInvert, "Null pointer");
  *aInvert = mInvert;
  return NS_OK;
}

NS_IMETHODIMP
inFlasher::SetInvert(PRBool aInvert)
{
  mInvert = aInvert;
  return NS_OK;
}

NS_IMETHODIMP
inFlasher::RepaintElement(nsIDOMElement* aElement)
{
  NS_ENSURE_ARG_POINTER(aElement);
  nsIFrame* frame = inLayoutUtils::GetFrameFor(aElement);
  if (!frame) return NS_OK;

  frame->Invalidate(frame->GetRect());

  return NS_OK;
}

NS_IMETHODIMP 
inFlasher::DrawElementOutline(nsIDOMElement* aElement)
{
  NS_ENSURE_ARG_POINTER(aElement);
  nsCOMPtr<nsIDOMWindowInternal> window = inLayoutUtils::GetWindowFor(aElement);
  if (!window) return NS_OK;
  nsCOMPtr<nsIPresShell> presShell = inLayoutUtils::GetPresShellFor(window);
  if (!presShell) return NS_OK;

  nsIFrame* frame = inLayoutUtils::GetFrameFor(aElement);

  PRBool isFirstFrame = PR_TRUE;

  while (frame) {
    nsPoint offset;
    nsIWidget* widget = frame->GetNearestWidget(offset);
    if (widget) {
      nsCOMPtr<nsIRenderingContext> rcontext;
      frame->PresContext()->DeviceContext()->
        CreateRenderingContext(widget, *getter_AddRefs(rcontext));
      if (rcontext) {
        nsRect rect(offset, frame->GetSize());
        if (mInvert) {
          rcontext->InvertRect(rect);
        }

        PRBool isLastFrame = frame->GetNextContinuation() == nsnull;
        DrawOutline(rect.x, rect.y, rect.width, rect.height, rcontext,
                    isFirstFrame, isLastFrame);
        isFirstFrame = PR_FALSE;
      }
    }
    frame = frame->GetNextContinuation();
  }

  return NS_OK;
}

NS_IMETHODIMP
inFlasher::ScrollElementIntoView(nsIDOMElement *aElement)
{
  NS_ENSURE_ARG_POINTER(aElement);
  nsCOMPtr<nsIDOMWindowInternal> window = inLayoutUtils::GetWindowFor(aElement);
  if (!window) {
    return NS_OK;
  }

  nsCOMPtr<nsIPresShell> presShell = inLayoutUtils::GetPresShellFor(window);
  if (!presShell) {
    return NS_OK;
  }

  nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
  presShell->ScrollContentIntoView(content,
                                   NS_PRESSHELL_SCROLL_ANYWHERE /* VPercent */,
                                   NS_PRESSHELL_SCROLL_ANYWHERE /* HPercent */,
                                   nsIPresShell::SCROLL_OVERFLOW_HIDDEN);

  return NS_OK;
}

///////////////////////////////////////////////////////////////////////////////
// inFlasher

void
inFlasher::DrawOutline(nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight,
                       nsIRenderingContext* aRenderContext,
                       PRBool aDrawBegin, PRBool aDrawEnd)
{
  aRenderContext->SetColor(mColor);

  DrawLine(aX, aY, aWidth, DIR_HORIZONTAL, BOUND_OUTER, aRenderContext);
  if (aDrawBegin) {
    DrawLine(aX, aY, aHeight, DIR_VERTICAL, BOUND_OUTER, aRenderContext);
  }
  DrawLine(aX, aY+aHeight, aWidth, DIR_HORIZONTAL, BOUND_INNER, aRenderContext);
  if (aDrawEnd) {
    DrawLine(aX+aWidth, aY, aHeight, DIR_VERTICAL, BOUND_INNER, aRenderContext);
  }
}

void
inFlasher::DrawLine(nscoord aX, nscoord aY, nscoord aLength,
                    PRBool aDir, PRBool aBounds,
                    nsIRenderingContext* aRenderContext)
{
  nscoord thickTwips = nsPresContext::CSSPixelsToAppUnits(mThickness);
  if (aDir) { // horizontal
    aRenderContext->FillRect(aX, aY+(aBounds?0:-thickTwips), aLength, thickTwips);
  } else { // vertical
    aRenderContext->FillRect(aX+(aBounds?0:-thickTwips), aY, thickTwips, aLength);
  }
}