nsFormControlFrame.h

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#ifndef nsFormControlFrame_h___
#define nsFormControlFrame_h___

#include "nsIFormControlFrame.h"
#include "nsLeafFrame.h"

/** 
 * nsFormControlFrame is the base class for radio buttons and
 * checkboxes.  It also has two static methods (RegUnRegAccessKey and
 * GetScreenHeight) that are used by other form controls.
 */
class nsFormControlFrame : public nsLeafFrame,
                           public nsIFormControlFrame
{
public:
  /**
    * Main constructor
    * @param aContent the content representing this frame
    * @param aParentFrame the parent frame
    */
  nsFormControlFrame(nsStyleContext*);

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

  NS_DECL_QUERYFRAME
  NS_DECL_FRAMEARENA_HELPERS

  /** 
    * Respond to a gui event
    * @see nsIFrame::HandleEvent
    */
  NS_IMETHOD HandleEvent(nsPresContext* aPresContext, 
                         nsGUIEvent* aEvent,
                         nsEventStatus* aEventStatus);

  virtual nscoord GetBaseline() const;

  /**
    * Respond to the request to resize and/or reflow
    * @see nsIFrame::Reflow
    */
  NS_IMETHOD Reflow(nsPresContext*      aCX,
                    nsHTMLReflowMetrics& aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus&      aStatus);

  virtual void DestroyFrom(nsIFrame* aDestructRoot);

  // new behavior

  virtual void SetFocus(PRBool aOn = PR_TRUE, PRBool aRepaint = PR_FALSE);

  // nsIFormControlFrame
  virtual nsresult SetFormProperty(nsIAtom* aName, const nsAString& aValue);

  virtual nsresult GetFormProperty(nsIAtom* aName, nsAString& aValue) const; 
  
  // AccessKey Helper function
  static nsresult RegUnRegAccessKey(nsIFrame * aFrame, PRBool aDoReg);

  /**
   * Returns the usable screen rect in app units, eg the rect where we can
   * draw dropdowns.
   */
  static nsRect GetUsableScreenRect(nsPresContext* aPresContext);

protected:

  virtual ~nsFormControlFrame();

  virtual nscoord GetIntrinsicWidth();
  virtual nscoord GetIntrinsicHeight();

//
//-------------------------------------------------------------------------------------
//  Utility methods for managing checkboxes and radiobuttons
//-------------------------------------------------------------------------------------
//   
   /**
    * Get the state of the checked attribute.
    * @param aState set to PR_TRUE if the checked attribute is set,
    * PR_FALSE if the checked attribute has been removed
    */

  void GetCurrentCheckState(PRBool* aState);
};

#endif