gecko/layout/forms/nsFileControlFrame.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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#ifndef nsFileControlFrame_h___
#define nsFileControlFrame_h___

#include "nsAreaFrame.h"
#include "nsIFormControlFrame.h"
#include "nsIDOMMouseListener.h"
#include "nsIAnonymousContentCreator.h"
#include "nsCOMPtr.h"

#include "nsTextControlFrame.h"
typedef   nsTextControlFrame nsNewFrame;

class nsFileControlFrame : public nsAreaFrame,
                           public nsIFormControlFrame,
                           public nsIAnonymousContentCreator
{
public:
  nsFileControlFrame(nsStyleContext* aContext);
  virtual ~nsFileControlFrame();

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

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

  NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);
  
  // nsIFormControlFrame
  virtual nsresult SetFormProperty(nsIAtom* aName, const nsAString& aValue);
  virtual nsresult GetFormProperty(nsIAtom* aName, nsAString& aValue) const;
  virtual void SetFocus(PRBool aOn, PRBool aRepaint);

  virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
  
  NS_IMETHOD Reflow(nsPresContext*          aCX,
                    nsHTMLReflowMetrics&     aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus&          aStatus);

  virtual void Destroy();

#ifdef NS_DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif

  NS_IMETHOD AttributeChanged(PRInt32         aNameSpaceID,
                              nsIAtom*        aAttribute,
                              PRInt32         aModType);
  virtual PRBool IsLeaf() const;



  // nsIAnonymousContentCreator
  virtual nsresult CreateAnonymousContent(nsTArray<nsIContent*>& aElements);

protected:
  class MouseListener;
  friend class MouseListener;
  class MouseListener : public nsIDOMMouseListener {
  public:
    NS_DECL_ISUPPORTS
    
    MouseListener(nsFileControlFrame* aFrame) :
      mFrame(aFrame)
    {}

    void ForgetFrame() {
      mFrame = nsnull;
    }
    
    // We just want to capture the click events on our browse button
    // and textfield.
    NS_IMETHOD MouseDown(nsIDOMEvent* aMouseEvent) { return NS_OK; }
    NS_IMETHOD MouseUp(nsIDOMEvent* aMouseEvent) { return NS_OK; }
    NS_IMETHOD MouseClick(nsIDOMEvent* aMouseEvent);
    NS_IMETHOD MouseDblClick(nsIDOMEvent* aMouseEvent) { return NS_OK; }
    NS_IMETHOD MouseOver(nsIDOMEvent* aMouseEvent) { return NS_OK; }
    NS_IMETHOD MouseOut(nsIDOMEvent* aMouseEvent) { return NS_OK; }
    NS_IMETHOD HandleEvent(nsIDOMEvent* aEvent) { return NS_OK; }

  private:
    nsFileControlFrame* mFrame;
  };
  
  nsresult MouseClick(nsIDOMEvent* aMouseEvent);

  virtual PRBool IsFrameOfType(PRUint32 aFlags) const
  {
    return nsAreaFrame::IsFrameOfType(aFlags &
      ~(nsIFrame::eReplaced | nsIFrame::eReplacedContainsBlock));
  }

  virtual PRIntn GetSkipSides() const;

  /**
   * The text frame (populated on initial reflow).
   * @see nsFileControlFrame::Reflow
   */
  nsNewFrame* mTextFrame;
  /**
   * The text box input.
   * @see nsFileControlFrame::CreateAnonymousContent
   */
  nsCOMPtr<nsIContent> mTextContent;
  /**
   * The browse button input.
   * @see nsFileControlFrame::CreateAnonymousContent
   */
  nsCOMPtr<nsIContent> mBrowse;
  /**
   * The current value, stored during those rare in-between periods where the
   * file frame is there but the input frame is not.
   */
  nsString*           mCachedState;

  /**
   * Our mouse listener.  This makes sure we don't get used after destruction.
   */
  nsRefPtr<MouseListener> mMouseListener;

private:
  /**
   * Find the first text frame child (first frame child whose content has input
   * type=text) of a frame.
   * XXX this is an awfully complicated implementation of something we could
   * likely do by just doing GetPrimaryFrame on mTextContent
   *
   * @param aPresContext the current pres context
   * @param aStart the parent frame to search children of
   * @return the text control frame, or null if not found
   */
  nsNewFrame* GetTextControlFrame(nsPresContext* aPresContext,
                                  nsIFrame* aStart);

  /**
   * Copy an attribute from file content to text and button content.
   * @param aNameSpaceID namespace of attr
   * @param aAttribute attribute atom
   * @param aWhichControls which controls to apply to (SYNC_TEXT or SYNC_FILE
   *        or SYNC_BOTH)
   */
  void SyncAttr(PRInt32 aNameSpaceID, nsIAtom* aAttribute,
                PRBool aWhichControls);

  NS_IMETHOD_(nsrefcnt) AddRef() { return 1; }
  NS_IMETHOD_(nsrefcnt) Release() { return 1; }
};

#endif