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nsQueryContentEventHandler.h

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 *   Masayuki Nakano <masayuki@d-toybox.com>
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#ifndef nsQueryContentEventHandler_h__
#define nsQueryContentEventHandler_h__

#include "nscore.h"
#include "nsCOMPtr.h"

#include "nsISelection.h"
#include "nsIRange.h"
#include "nsIContent.h"
#include "nsIDOMTreeWalker.h"

class nsPresContext;
class nsIPresShell;
class nsQueryContentEvent;
class nsICaret;
struct nsRect;

/*
 * Query Content Event Handler
 *   nsQueryContentEventHandler is a helper class for nsEventStateManager.
 *   The platforms request some content informations, e.g., the selected text,
 *   the offset of the selected text and the text for specified range.
 *   This class answers to NS_QUERY_* events from actual contents.
 */

class nsQueryContentEventHandler {
public:
  nsQueryContentEventHandler(nsPresContext *aPresContext);

  // NS_QUERY_SELECTED_TEXT event handler
  nsresult OnQuerySelectedText(nsQueryContentEvent* aEvent);
  // NS_QUERY_TEXT_CONTENT event handler
  nsresult OnQueryTextContent(nsQueryContentEvent* aEvent);
  // NS_QUERY_CHARACTER_RECT event handler
  nsresult OnQueryCharacterRect(nsQueryContentEvent* aEvent);
  // NS_QUERY_CARET_RECT event handler
  nsresult OnQueryCaretRect(nsQueryContentEvent* aEvent);
protected:
  nsPresContext* mPresContext;
  nsIPresShell* mPresShell;
  nsCOMPtr<nsISelection> mSelection;
  nsCOMPtr<nsIRange> mFirstSelectedRange;
  nsCOMPtr<nsIContent> mRootContent;

  nsresult Init(nsQueryContentEvent* aEvent);

  // FlatText means the text that is generated from DOM tree. The BR elements
  // are replaced to native linefeeds. Other elements are ignored.

  // Generate the FlatText from DOM range.
  nsresult GenerateFlatTextContent(nsIRange* aRange, nsAFlatString& aString);
  // Make the DOM range from the offset of FlatText and the text length.
  // If aExpandToClusterBoundaries is true, the start offset and the end one are
  // expanded to nearest cluster boundaries.
  nsresult SetRangeFromFlatTextOffset(nsIRange* aRange,
                                      PRUint32 aNativeOffset,
                                      PRUint32 aNativeLength,
                                      PRBool aExpandToClusterBoundaries);
  // Get the offset in FlatText of the range.
  nsresult GetFlatTextOffsetOfRange(nsIRange* aRange, PRUint32* aOffset);
  // Find the first textframe for the range, and get the start offset in
  // the frame.
  nsresult GetStartFrameAndOffset(nsIRange* aRange,
                                  nsIFrame** aFrame, PRInt32* aOffsetInFrame);
  // Convert the frame relative offset to the root view relative offset.
  nsresult ConvertToRootViewRelativeOffset(nsIFrame* aFrame, nsRect& aRect);
  // The helper for OnQueryCharacterRect/OnQueryCaretRect.
  // Don't call for another event.
  nsresult QueryRectFor(nsQueryContentEvent* aEvent, nsIRange* aRange,
                        nsICaret* aCaret);
  // Expand aXPOffset to the nearest offset in cluster boundary. aForward is
  // true, it is expanded to forward.
  nsresult ExpandToClusterBoundary(nsIContent* aContent, PRBool aForward,
                                   PRUint32* aXPOffset);
};

#endif // nsQueryContentEventHandler_h__

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