gecko/layout/forms/nsTextControlFrame.h

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#ifndef nsTextControlFrame_h___
#define nsTextControlFrame_h___

#include "nsStackFrame.h"
#include "nsBlockFrame.h"
#include "nsIFormControlFrame.h"
#include "nsIDOMMouseListener.h"
#include "nsIAnonymousContentCreator.h"
#include "nsIEditor.h"
#include "nsITextControlFrame.h"
#include "nsIFontMetrics.h"
#include "nsWeakReference.h" //for service and presshell pointers
#include "nsContentUtils.h"
#include "nsDisplayList.h"
#include "nsIScrollableFrame.h"
#include "nsStubMutationObserver.h"

class nsIEditor;
class nsISelectionController;
class nsTextInputSelectionImpl;
class nsTextInputListener;
class nsIDOMCharacterData;
#ifdef ACCESSIBILITY
class nsIAccessible;
#endif
class nsTextInputSelectionImpl;
class nsTextControlFrame;
class EditorInitializerEntryTracker;

class nsAnonDivObserver : public nsStubMutationObserver
{
public:
  nsAnonDivObserver(nsTextControlFrame* aTextControl)
  : mTextControl(aTextControl) {}
  NS_DECL_ISUPPORTS
  NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
  NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED

private:
  nsTextControlFrame* mTextControl;
};

class nsTextControlFrame : public nsStackFrame,
                           public nsIAnonymousContentCreator,
                           public nsITextControlFrame
{
public:
  NS_DECL_FRAMEARENA_HELPERS

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

  virtual void DestroyFrom(nsIFrame* aDestructRoot);

  virtual nsIScrollableFrame* GetScrollTargetFrame() {
    if (!IsScrollable())
      return nsnull;
    return do_QueryFrame(GetFirstChild(nsnull));
  }

  virtual nscoord GetMinWidth(nsIRenderingContext* aRenderingContext);
  virtual nsSize ComputeAutoSize(nsIRenderingContext *aRenderingContext,
                                 nsSize aCBSize, nscoord aAvailableWidth,
                                 nsSize aMargin, nsSize aBorder,
                                 nsSize aPadding, PRBool aShrinkWrap);

  NS_IMETHOD Reflow(nsPresContext*          aPresContext,
                    nsHTMLReflowMetrics&     aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus&          aStatus);

  virtual nsSize GetPrefSize(nsBoxLayoutState& aBoxLayoutState);
  virtual nsSize GetMinSize(nsBoxLayoutState& aBoxLayoutState);
  virtual nsSize GetMaxSize(nsBoxLayoutState& aBoxLayoutState);
  virtual nscoord GetBoxAscent(nsBoxLayoutState& aBoxLayoutState);
  virtual PRBool IsCollapsed(nsBoxLayoutState& aBoxLayoutState);

  DECL_DO_GLOBAL_REFLOW_COUNT_DSP(nsTextControlFrame, nsStackFrame)

  virtual PRBool IsLeaf() const;
  
#ifdef ACCESSIBILITY
  NS_IMETHOD GetAccessible(nsIAccessible** aAccessible);
#endif

#ifdef NS_DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const
  {
    aResult.AssignLiteral("nsTextControlFrame");
    return NS_OK;
  }
#endif

  virtual PRBool IsFrameOfType(PRUint32 aFlags) const
  {
    // nsStackFrame is already both of these, but that's somewhat bogus,
    // and we really mean it.
    return nsStackFrame::IsFrameOfType(aFlags &
      ~(nsIFrame::eReplaced | nsIFrame::eReplacedContainsBlock));
  }

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

  // Utility methods to set current widget state

  // Be careful when using this method.
  // Calling it may cause |this| to be deleted.
  // In that case the method returns an error value.
  nsresult SetValue(const nsAString& aValue);
  NS_IMETHOD SetInitialChildList(nsIAtom*        aListName,
                                 nsFrameList&    aChildList);

//==== BEGIN NSIFORMCONTROLFRAME
  virtual void SetFocus(PRBool aOn , PRBool aRepaint); 
  virtual nsresult SetFormProperty(nsIAtom* aName, const nsAString& aValue);
  virtual nsresult GetFormProperty(nsIAtom* aName, nsAString& aValue) const; 


//==== END NSIFORMCONTROLFRAME

//==== NSITEXTCONTROLFRAME

  NS_IMETHOD    GetEditor(nsIEditor **aEditor);
  NS_IMETHOD    OwnsValue(PRBool* aOwnsValue);
  NS_IMETHOD    GetValue(nsAString& aValue, PRBool aIgnoreWrap) const;
  NS_IMETHOD    GetTextLength(PRInt32* aTextLength);
  NS_IMETHOD    CheckFireOnChange();
  NS_IMETHOD    SetSelectionStart(PRInt32 aSelectionStart);
  NS_IMETHOD    SetSelectionEnd(PRInt32 aSelectionEnd);
  NS_IMETHOD    SetSelectionRange(PRInt32 aSelectionStart, PRInt32 aSelectionEnd);
  NS_IMETHOD    GetSelectionRange(PRInt32* aSelectionStart, PRInt32* aSelectionEnd);
  virtual nsISelectionController* GetOwnedSelectionController();
  virtual nsFrameSelection* GetOwnedFrameSelection()
    { return mFrameSel; }

  nsresult GetPhonetic(nsAString& aPhonetic);

  /**
   * Ensure mEditor is initialized with the proper flags and the default value.
   * @throws NS_ERROR_NOT_INITIALIZED if mEditor has not been created
   * @throws various and sundry other things
   */
  virtual nsresult EnsureEditorInitialized();

//==== END NSITEXTCONTROLFRAME
//==== OVERLOAD of nsIFrame
  virtual nsIAtom* GetType() const;

  /** handler for attribute changes to mContent */
  NS_IMETHOD AttributeChanged(PRInt32         aNameSpaceID,
                              nsIAtom*        aAttribute,
                              PRInt32         aModType);

  nsresult GetText(nsString& aText);

  NS_DECL_QUERYFRAME

public: //for methods who access nsTextControlFrame directly
  /**
   * Find out whether this is a single line text control.  (text or password)
   * @return whether this is a single line text control
   */
  PRBool IsSingleLineTextControl() const;
  /**
   * Find out whether this control is a textarea.
   * @return whether this is a textarea text control
   */
  PRBool IsTextArea() const;
  /**
   * Find out whether this control edits plain text.  (Currently always true.)
   * @return whether this is a plain text control
   */
  PRBool IsPlainTextControl() const;
  /**
   * Find out whether this is a password control (input type=password)
   * @return whether this is a password ontrol
   */
  PRBool IsPasswordTextControl() const;
  void FireOnInput();
  void SetValueChanged(PRBool aValueChanged);
  /** Called when the frame is focused, to remember the value for onChange. */
  nsresult InitFocusedValue();

  void SetFireChangeEventState(PRBool aNewState)
  {
    mFireChangeEventState = aNewState;
  }

  PRBool GetFireChangeEventState() const
  {
    return mFireChangeEventState;
  }    

  /* called to free up native keybinding services */
  static NS_HIDDEN_(void) ShutDown();

  // called by the focus listener
  nsresult MaybeBeginSecureKeyboardInput();
  void MaybeEndSecureKeyboardInput();

  void ClearValueCache() { mCachedValue.Truncate(); }
protected:
  class EditorInitializer;
  friend class EditorInitializer;

  class EditorInitializer : public nsRunnable {
  public:
    EditorInitializer(nsTextControlFrame* aFrame) :
      mWeakFrame(aFrame),
      mFrame(aFrame) {}

    NS_IMETHOD Run() {
      if (mWeakFrame) {
        nsCOMPtr<nsIPresShell> shell =
          mWeakFrame.GetFrame()->PresContext()->GetPresShell();
        PRBool observes = shell->ObservesNativeAnonMutationsForPrint();
        shell->ObserveNativeAnonMutationsForPrint(PR_TRUE);
        mFrame->EnsureEditorInitializedInternal();
        shell->ObserveNativeAnonMutationsForPrint(observes);
      }
      return NS_OK;
    }

  private:
    nsWeakFrame mWeakFrame;
    nsTextControlFrame* mFrame;
  };

  nsresult DOMPointToOffset(nsIDOMNode* aNode, PRInt32 aNodeOffset, PRInt32 *aResult);
  nsresult OffsetToDOMPoint(PRInt32 aOffset, nsIDOMNode** aResult, PRInt32* aPosition);

  /**
   * Find out whether this control is scrollable (i.e. if it is not a single
   * line text control)
   * @return whether this control is scrollable
   */
  PRBool IsScrollable() const;

  /**
   * Update the textnode under our anonymous div to show the new
   * value. This should only be called when we have no editor yet.
   * @throws NS_ERROR_UNEXPECTED if the div has no text content
   */
  nsresult UpdateValueDisplay(PRBool aNotify,
                              PRBool aBeforeEditorInit = PR_FALSE,
                              const nsAString *aValue = nsnull);

  /**
   * Get the maxlength attribute
   * @param aMaxLength the value of the max length attr
   * @returns PR_FALSE if attr not defined
   */
  PRBool GetMaxLength(PRInt32* aMaxLength);

  /**
   * Find out whether an attribute exists on the content or not.
   * @param aAtt the attribute to determine the existence of
   * @returns PR_FALSE if it does not exist
   */
  PRBool AttributeExists(nsIAtom *aAtt) const
  { return mContent && mContent->HasAttr(kNameSpaceID_None, aAtt); }

  /**
   * We call this when we are being destroyed or removed from the PFM.
   * @param aPresContext the current pres context
   */
  void PreDestroy();

  // Helper methods
  /**
   * Get the cols attribute (if textarea) or a default
   * @return the number of columns to use
   */
  PRInt32 GetCols();

  /**
   * Get the column index to wrap at, or -1 if we shouldn't wrap
   */
  PRInt32 GetWrapCols();

  /**
   * Get the rows attribute (if textarea) or a default
   * @return the number of rows to use
   */
  PRInt32 GetRows();

  // Compute our intrinsic size.  This does not include any borders, paddings,
  // etc.  Just the size of our actual area for the text (and the scrollbars,
  // for <textarea>).
  nsresult CalcIntrinsicSize(nsIRenderingContext* aRenderingContext,
                             nsSize&              aIntrinsicSize);

private:
  //helper methods
  nsresult SetSelectionInternal(nsIDOMNode *aStartNode, PRInt32 aStartOffset,
                                nsIDOMNode *aEndNode, PRInt32 aEndOffset);
  nsresult SelectAllOrCollapseToEndOfText(PRBool aSelect);
  nsresult SetSelectionEndPoints(PRInt32 aSelStart, PRInt32 aSelEnd);

  // placeholder methods
  nsresult CreatePlaceholderDiv(nsTArray<nsIContent*>& aElements, nsNodeInfoManager* pNodeInfoManager);
  nsresult ShowPlaceholder();
  nsresult HidePlaceholder();
  nsresult SetPlaceholderClass(PRBool aVisible, PRBool aNotify);
  nsresult UpdatePlaceholderText(PRBool aNotify); 

  // This method performs the actual tasks of initializing the editor.
  // EnsureEditorInitialized is a wrapper of this method which wraps it with
  // a weak frame check.
  virtual nsresult EnsureEditorInitializedInternal();

private:
  nsCOMPtr<nsIContent> mValueDiv;
  nsCOMPtr<nsIContent> mPlaceholderDiv;

  nsCOMPtr<nsIEditor> mEditor;

  // these packed bools could instead use the high order bits on mState, saving 4 bytes 
  PRPackedBool mUseEditor;
  PRPackedBool mIsProcessing;
  PRPackedBool mNotifyOnInput;//default this to off to stop any notifications until setup is complete
  PRPackedBool mDidPreDestroy; // has PreDestroy been called
  // Calls to SetValue will be treated as user values (i.e. trigger onChange
  // eventually) when mFireChangeEventState==true, this is used by nsFileControlFrame.
  PRPackedBool mFireChangeEventState;
  PRPackedBool mInSecureKeyboardInputMode;

#ifdef DEBUG
  PRPackedBool mInEditorInitialization;
  friend class EditorInitializerEntryTracker;
#endif

  nsRefPtr<nsTextInputSelectionImpl> mSelCon;
  nsCOMPtr<nsFrameSelection> mFrameSel;
  nsTextInputListener* mTextListener;
  nsString mFocusedValue;
  nsString mCachedValue; // Caches non-hard-wrapped value on a multiline control.
  nsRefPtr<nsAnonDivObserver> mMutationObserver;
};

#endif