gecko/layout/xul/base/src/nsProgressMeterFrame.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 *
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 * 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 Communicator client code.
 *
 * The Initial Developer of the Original Code is
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 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
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 *
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 * either of 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"),
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//
// David Hyatt & Eric Vaughan
// Netscape Communications
//
// See documentation in associated header file
//

#include "nsProgressMeterFrame.h"
#include "nsCSSRendering.h"
#include "nsIContent.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "nsINameSpaceManager.h"
#include "nsCOMPtr.h"
#include "nsBoxLayoutState.h"
#include "nsIReflowCallback.h"
//
// NS_NewToolbarFrame
//
// Creates a new Toolbar frame and returns it
//
nsIFrame*
NS_NewProgressMeterFrame (nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsProgressMeterFrame(aPresShell, aContext);
} // NS_NewProgressMeterFrame

//
// nsProgressMeterFrame dstr
//
// Cleanup, if necessary
//
nsProgressMeterFrame :: ~nsProgressMeterFrame ( )
{
}

class nsAsyncProgressMeterInit : public nsIReflowCallback
{
public:
  nsAsyncProgressMeterInit(nsIFrame* aFrame) : mWeakFrame(aFrame) {}

  virtual PRBool ReflowFinished()
  {
    PRBool shouldFlush = PR_FALSE;
    nsIFrame* frame = mWeakFrame.GetFrame();
    if (frame) {
      frame->AttributeChanged(kNameSpaceID_None, nsGkAtoms::value, 0);
      shouldFlush = PR_TRUE;
    }
    delete this;
    return shouldFlush;
  }

  virtual void ReflowCallbackCanceled()
  {
    delete this;
  }

  nsWeakFrame mWeakFrame;
};

NS_IMETHODIMP
nsProgressMeterFrame::DoLayout(nsBoxLayoutState& aState)
{
  if (mNeedsReflowCallback) {
    nsIReflowCallback* cb = new nsAsyncProgressMeterInit(this);
    if (cb) {
      PresContext()->PresShell()->PostReflowCallback(cb);
    }
    mNeedsReflowCallback = PR_FALSE;
  }
  return nsBoxFrame::DoLayout(aState);
}

NS_IMETHODIMP
nsProgressMeterFrame::AttributeChanged(PRInt32 aNameSpaceID,
                                       nsIAtom* aAttribute,
                                       PRInt32 aModType)
{
  nsresult rv = nsBoxFrame::AttributeChanged(aNameSpaceID, aAttribute,
                                             aModType);
  if (NS_OK != rv) {
    return rv;
  }

  // did the progress change?
  if (nsGkAtoms::value == aAttribute) {
    nsIFrame* barChild = GetFirstChild(nsnull);
    if (!barChild) return NS_OK;
    nsIFrame* remainderChild = barChild->GetNextSibling();
    if (!remainderChild) return NS_OK;
    nsCOMPtr<nsIContent> remainderContent = remainderChild->GetContent();
    if (!remainderContent) return NS_OK;

    nsAutoString value;
    mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::value, value);

    PRInt32 error;
    PRInt32 flex = value.ToInteger(&error);
    if (flex < 0) flex = 0;
    if (flex > 100) flex = 100;

    PRInt32 remainder = 100 - flex;

    nsAutoString leftFlex, rightFlex;
    leftFlex.AppendInt(flex);
    rightFlex.AppendInt(remainder);
    nsWeakFrame weakFrame(this);
    barChild->GetContent()->SetAttr(kNameSpaceID_None, nsGkAtoms::flex, leftFlex, PR_TRUE);
    remainderContent->SetAttr(kNameSpaceID_None, nsGkAtoms::flex, rightFlex, PR_TRUE);

    if (weakFrame.IsAlive()) {
      PresContext()->PresShell()->
        FrameNeedsReflow(this, nsIPresShell::eTreeChange, NS_FRAME_IS_DIRTY);
    }
  }
  return NS_OK;
}

#ifdef NS_DEBUG
NS_IMETHODIMP
nsProgressMeterFrame::GetFrameName(nsAString& aResult) const
{
  return MakeFrameName(NS_LITERAL_STRING("ProgressMeter"), aResult);
}
#endif