/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * 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"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * ***** END LICENSE BLOCK ***** */

#ifndef nsSliderFrame_h__
#define nsSliderFrame_h__

#include "nsRepeatService.h"
#include "nsBoxFrame.h"
#include "prtypes.h"
#include "nsIAtom.h"
#include "nsCOMPtr.h"
#include "nsITimer.h"
#include "nsIDOMMouseListener.h"

class nsString;
class nsITimer;
class nsSliderFrame;

nsIFrame* NS_NewSliderFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);

class nsSliderMediator : public nsIDOMMouseListener
{
public:

  NS_DECL_ISUPPORTS

  nsSliderFrame* mSlider;

  nsSliderMediator(nsSliderFrame* aSlider) {  mSlider = aSlider; }
  virtual ~nsSliderMediator() {}

  virtual void SetSlider(nsSliderFrame* aSlider) { mSlider = aSlider; }

 /**
  * Processes a mouse down event
  * @param aMouseEvent @see nsIDOMEvent.h 
  * @returns whether the event was consumed or ignored. @see nsresult
  */
  NS_IMETHOD MouseDown(nsIDOMEvent* aMouseEvent);

  /**
   * Processes a mouse up event
   * @param aMouseEvent @see nsIDOMEvent.h 
   * @returns whether the event was consumed or ignored. @see nsresult
   */
  NS_IMETHOD MouseUp(nsIDOMEvent* aMouseEvent);

  /**
   * Processes a mouse click event
   * @param aMouseEvent @see nsIDOMEvent.h 
   * @returns whether the event was consumed or ignored. @see nsresult
   *
   */
  NS_IMETHOD MouseClick(nsIDOMEvent* aMouseEvent) { return NS_OK; }

  /**
   * Processes a mouse click event
   * @param aMouseEvent @see nsIDOMEvent.h 
   * @returns whether the event was consumed or ignored. @see nsresult
   *
   */
  NS_IMETHOD MouseDblClick(nsIDOMEvent* aMouseEvent) { return NS_OK; }

  /**
   * Processes a mouse enter event
   * @param aMouseEvent @see nsIDOMEvent.h 
   * @returns whether the event was consumed or ignored. @see nsresult
   */
  NS_IMETHOD MouseOver(nsIDOMEvent* aMouseEvent) { return NS_OK; }

  /**
   * Processes a mouse leave event
   * @param aMouseEvent @see nsIDOMEvent.h 
   * @returns whether the event was consumed or ignored. @see nsresult
   */
  NS_IMETHOD MouseOut(nsIDOMEvent* aMouseEvent) { return NS_OK; }

  NS_IMETHOD HandleEvent(nsIDOMEvent* aEvent) { return NS_OK; }
};

class nsSliderFrame : public nsBoxFrame
{
public:
  NS_DECL_FRAMEARENA_HELPERS

  friend class nsSliderMediator;

  nsSliderFrame(nsIPresShell* aShell, nsStyleContext* aContext);
  virtual ~nsSliderFrame();

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const {
    return MakeFrameName(NS_LITERAL_STRING("SliderFrame"), aResult);
  }
#endif

  // nsIBox
  virtual nsSize GetPrefSize(nsBoxLayoutState& aBoxLayoutState);
  virtual nsSize GetMinSize(nsBoxLayoutState& aBoxLayoutState);
  virtual nsSize GetMaxSize(nsBoxLayoutState& aBoxLayoutState);
  NS_IMETHOD DoLayout(nsBoxLayoutState& aBoxLayoutState);

  // nsIFrame overrides
  NS_IMETHOD  AppendFrames(nsIAtom*        aListName,
                           nsFrameList&    aFrameList);

  NS_IMETHOD  InsertFrames(nsIAtom*        aListName,
                           nsIFrame*       aPrevFrame,
                           nsFrameList&    aFrameList);

  NS_IMETHOD  RemoveFrame(nsIAtom*        aListName,
                          nsIFrame*       aOldFrame);

  virtual void DestroyFrom(nsIFrame* aDestructRoot);

  NS_IMETHOD BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,
                                         const nsRect&           aDirtyRect,
                                         const nsDisplayListSet& aLists);

  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists);
 
  NS_IMETHOD AttributeChanged(PRInt32 aNameSpaceID,
                              nsIAtom* aAttribute,
                              PRInt32 aModType);

  NS_IMETHOD  Init(nsIContent*      aContent,
                   nsIFrame*        aParent,
                   nsIFrame*        asPrevInFlow);


  NS_IMETHOD HandleEvent(nsPresContext* aPresContext, 
                         nsGUIEvent* aEvent,
                         nsEventStatus* aEventStatus);

  NS_IMETHOD SetInitialChildList(nsIAtom*        aListName,
                                 nsFrameList&    aChildList);

  virtual nsIAtom* GetType() const;

  NS_IMETHOD MouseDown(nsIDOMEvent* aMouseEvent);
  NS_IMETHOD MouseUp(nsIDOMEvent* aMouseEvent);

  NS_IMETHOD HandleEvent(nsIDOMEvent* aEvent) { return NS_OK; }

  static PRInt32 GetCurrentPosition(nsIContent* content);
  static PRInt32 GetMinPosition(nsIContent* content);
  static PRInt32 GetMaxPosition(nsIContent* content);
  static PRInt32 GetIncrement(nsIContent* content);
  static PRInt32 GetPageIncrement(nsIContent* content);
  static PRInt32 GetIntegerAttribute(nsIContent* content, nsIAtom* atom, PRInt32 defaultValue);
  void EnsureOrient();

  NS_IMETHOD HandlePress(nsPresContext* aPresContext,
                         nsGUIEvent *    aEvent,
                         nsEventStatus*  aEventStatus);

  NS_IMETHOD HandleMultiplePress(nsPresContext* aPresContext,
                                 nsGUIEvent *    aEvent,
                                 nsEventStatus*  aEventStatus,
                                 PRBool aControlHeld)  { return NS_OK; }

  NS_IMETHOD HandleDrag(nsPresContext* aPresContext,
                        nsGUIEvent *    aEvent,
                        nsEventStatus*  aEventStatus)  { return NS_OK; }

  NS_IMETHOD HandleRelease(nsPresContext* aPresContext,
                           nsGUIEvent *    aEvent,
                           nsEventStatus*  aEventStatus);

private:

  PRBool GetScrollToClick();
  nsIBox* GetScrollbar();

  void PageUpDown(nscoord change);
  void SetCurrentThumbPosition(nsIContent* aScrollbar, nscoord aNewPos, PRBool aIsSmooth,
                               PRBool aImmediateRedraw, PRBool aMaySnap);
  void SetCurrentPosition(nsIContent* aScrollbar, PRInt32 aNewPos, PRBool aIsSmooth,
                          PRBool aImmediateRedraw);
  void SetCurrentPositionInternal(nsIContent* aScrollbar, PRInt32 pos,
                                  PRBool aIsSmooth, PRBool aImmediateRedraw);
  nsresult CurrentPositionChanged(nsPresContext* aPresContext,
                                  PRBool aImmediateRedraw);
  void DragThumb(PRBool aGrabMouseEvents);
  void AddListener();
  void RemoveListener();
  PRBool isDraggingThumb();

  void StartRepeat() {
    nsRepeatService::GetInstance()->Start(Notify, this);
  }
  void StopRepeat() {
    nsRepeatService::GetInstance()->Stop(Notify, this);
  }
  void Notify();
  static void Notify(void* aData) {
    (static_cast<nsSliderFrame*>(aData))->Notify();
  }
 
  nsPoint mDestinationPoint;
  nsRefPtr<nsSliderMediator> mMediator;

  float mRatio;

  nscoord mDragStart;
  nscoord mThumbStart;

  PRInt32 mCurPos;

  nscoord mChange;

  // true if an attribute change has been caused by the user manipulating the
  // slider. This allows notifications to tell how a slider's current position
  // was changed.
  PRBool mUserChanged;

  static PRBool gMiddlePref;
  static PRInt32 gSnapMultiplier;
}; // class nsSliderFrame

#endif
