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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsCOMPtr.h"
#include "nsTitleBarFrame.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIDOMNodeList.h"
#include "nsGkAtoms.h"
#include "nsIWidget.h"
#include "nsMenuPopupFrame.h"
#include "nsPresContext.h"
#include "nsIDocShell.h"
#include "nsPIDOMWindow.h"
#include "nsDisplayList.h"
#include "nsContentUtils.h"
#include "mozilla/MouseEvents.h"

using namespace mozilla;

//
// NS_NewTitleBarFrame
//
// Creates a new TitleBar frame and returns it
//
nsIFrame*
NS_NewTitleBarFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsTitleBarFrame(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsTitleBarFrame)

nsTitleBarFrame::nsTitleBarFrame(nsStyleContext* aContext)
:nsBoxFrame(aContext, false)
{
  mTrackingMouseMove = false;
  UpdateMouseThrough();
}

void
nsTitleBarFrame::BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,
                                             const nsRect&           aDirtyRect,
                                             const nsDisplayListSet& aLists)
{
  // override, since we don't want children to get events
  if (aBuilder->IsForEventDelivery()) {
    if (!mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::allowevents,
                               nsGkAtoms::_true, eCaseMatters))
      return;
  }
  nsBoxFrame::BuildDisplayListForChildren(aBuilder, aDirtyRect, aLists);
}

nsresult
nsTitleBarFrame::HandleEvent(nsPresContext* aPresContext,
                             WidgetGUIEvent* aEvent,
                             nsEventStatus* aEventStatus)
{
  NS_ENSURE_ARG_POINTER(aEventStatus);
  if (nsEventStatus_eConsumeNoDefault == *aEventStatus) {
    return NS_OK;
  }

  bool doDefault = true;

  switch (aEvent->mMessage) {

   case eMouseDown: {
       if (aEvent->AsMouseEvent()->button == WidgetMouseEvent::eLeftButton) {
         // titlebar has no effect in non-chrome shells
         nsCOMPtr<nsIDocShellTreeItem> dsti = aPresContext->GetDocShell();
         if (dsti) {
           if (dsti->ItemType() == nsIDocShellTreeItem::typeChrome) {
             // we're tracking.
             mTrackingMouseMove = true;

             // start capture.
             nsIPresShell::SetCapturingContent(GetContent(), CAPTURE_IGNOREALLOWED);

             // remember current mouse coordinates.
             mLastPoint = aEvent->mRefPoint;
           }
         }

         *aEventStatus = nsEventStatus_eConsumeNoDefault;
         doDefault = false;
       }
     }
     break;


   case eMouseUp: {
       if (mTrackingMouseMove &&
           aEvent->AsMouseEvent()->button == WidgetMouseEvent::eLeftButton) {
         // we're done tracking.
         mTrackingMouseMove = false;

         // end capture
         nsIPresShell::SetCapturingContent(nullptr, 0);

         *aEventStatus = nsEventStatus_eConsumeNoDefault;
         doDefault = false;
       }
     }
     break;

   case eMouseMove: {
       if(mTrackingMouseMove)
       {
         LayoutDeviceIntPoint nsMoveBy = aEvent->mRefPoint - mLastPoint;

         nsIFrame* parent = GetParent();
         while (parent) {
           nsMenuPopupFrame* popupFrame = do_QueryFrame(parent);
           if (popupFrame)
             break;
           parent = parent->GetParent();
         }

         // if the titlebar is in a popup, move the popup frame, otherwise
         // move the widget associated with the window
         if (parent) {
           nsMenuPopupFrame* menuPopupFrame = static_cast<nsMenuPopupFrame*>(parent);
           nsCOMPtr<nsIWidget> widget = menuPopupFrame->GetWidget();
           LayoutDeviceIntRect bounds = widget->GetScreenBounds();

           CSSPoint cssPos = (bounds.TopLeft() + nsMoveBy)
                           / aPresContext->CSSToDevPixelScale();
           menuPopupFrame->MoveTo(RoundedToInt(cssPos), false);
         }
         else {
           nsIPresShell* presShell = aPresContext->PresShell();
           nsPIDOMWindowOuter *window = presShell->GetDocument()->GetWindow();
           if (window) {
             window->MoveBy(nsMoveBy.x, nsMoveBy.y);
           }
         }

         *aEventStatus = nsEventStatus_eConsumeNoDefault;

         doDefault = false;
       }
     }
     break;

    case eMouseClick: {
      WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
      if (mouseEvent->IsLeftClickEvent()) {
        MouseClicked(mouseEvent);
      }
      break;
    }

    default:
      break;
  }

  if ( doDefault )
    return nsBoxFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
  else
    return NS_OK;
}

void
nsTitleBarFrame::MouseClicked(WidgetMouseEvent* aEvent)
{
  // Execute the oncommand event handler.
  nsContentUtils::DispatchXULCommand(mContent, aEvent && aEvent->IsTrusted());
}