/* 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 "nsTreeImageListener.h"

#include "XULTreeElement.h"
#include "imgIContainer.h"
#include "imgIRequest.h"
#include "nsIContent.h"
#include "nsTreeColumns.h"

using mozilla::dom::XULTreeElement;

NS_IMPL_ISUPPORTS(nsTreeImageListener, imgINotificationObserver)

nsTreeImageListener::nsTreeImageListener(nsTreeBodyFrame* aTreeFrame)
    : mTreeFrame(aTreeFrame),
      mInvalidationSuppressed(true),
      mInvalidationArea(nullptr) {}

nsTreeImageListener::~nsTreeImageListener() { delete mInvalidationArea; }

void nsTreeImageListener::Notify(imgIRequest* aRequest, int32_t aType,
                                 const nsIntRect* aData) {
  if (aType == imgINotificationObserver::IS_ANIMATED) {
    if (mTreeFrame) {
      mTreeFrame->OnImageIsAnimated(aRequest);
    }
    return;
  }

  if (aType == imgINotificationObserver::SIZE_AVAILABLE) {
    // Ensure the animation (if any) is started. Note: There is no
    // corresponding call to Decrement for this. This Increment will be
    // 'cleaned up' by the Request when it is destroyed, but only then.
    aRequest->IncrementAnimationConsumers();

    if (mTreeFrame) {
      nsCOMPtr<imgIContainer> image;
      aRequest->GetImage(getter_AddRefs(image));
      if (image) {
        nsPresContext* presContext = mTreeFrame->PresContext();
        image->SetAnimationMode(presContext->ImageAnimationMode());
      }
    }
  }

  if (aType == imgINotificationObserver::FRAME_UPDATE) {
    Invalidate();
  }
}

void nsTreeImageListener::AddCell(int32_t aIndex, nsTreeColumn* aCol) {
  if (!mInvalidationArea) {
    mInvalidationArea = new InvalidationArea(aCol);
    mInvalidationArea->AddRow(aIndex);
  } else {
    InvalidationArea* currArea;
    for (currArea = mInvalidationArea; currArea;
         currArea = currArea->GetNext()) {
      if (currArea->GetCol() == aCol) {
        currArea->AddRow(aIndex);
        break;
      }
    }
    if (!currArea) {
      currArea = new InvalidationArea(aCol);
      currArea->SetNext(mInvalidationArea);
      mInvalidationArea = currArea;
      mInvalidationArea->AddRow(aIndex);
    }
  }
}

void nsTreeImageListener::Invalidate() {
  if (mInvalidationSuppressed) {
    return;
  }
  for (InvalidationArea* currArea = mInvalidationArea; currArea;
       currArea = currArea->GetNext()) {
    // Loop from min to max, invalidating each cell that was listening for
    // this image.
    for (int32_t i = currArea->GetMin(); i <= currArea->GetMax(); ++i) {
      if (mTreeFrame) {
        RefPtr<XULTreeElement> tree =
            XULTreeElement::FromNodeOrNull(mTreeFrame->GetBaseElement());
        if (tree) {
          tree->InvalidateCell(i, currArea->GetCol());
        }
      }
    }
  }
}

nsTreeImageListener::InvalidationArea::InvalidationArea(nsTreeColumn* aCol)
    : mCol(aCol),
      mMin(-1),  // min should start out "undefined"
      mMax(0),
      mNext(nullptr) {}

void nsTreeImageListener::InvalidationArea::AddRow(int32_t aIndex) {
  if (mMin == -1) {
    mMin = mMax = aIndex;
  } else if (aIndex < mMin) {
    mMin = aIndex;
  } else if (aIndex > mMax) {
    mMax = aIndex;
  }
}