gecko/content/events/src/nsIMEStateManager.h

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 * Contributor(s):
 *   Masayuki Nakano <masayuki@d-toybox.com>
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#ifndef nsIMEStateManager_h__
#define nsIMEStateManager_h__

#include "nscore.h"

class nsIContent;
class nsPIDOMWindow;
class nsPresContext;
class nsIWidget;
class nsTextStateManager;
class nsISelection;

/*
 * IME state manager
 */

class nsIMEStateManager
{
public:
  static nsresult OnDestroyPresContext(nsPresContext* aPresContext);
  static nsresult OnRemoveContent(nsPresContext* aPresContext,
                                  nsIContent* aContent);
  static nsresult OnChangeFocus(nsPresContext* aPresContext,
                                nsIContent* aContent,
                                PRUint32 aReason);
  static void OnInstalledMenuKeyboardListener(bool aInstalling);

  // These two methods manage focus and selection/text observers.
  // They are separate from OnChangeFocus above because this offers finer
  // control compared to having the two methods incorporated into OnChangeFocus

  // OnTextStateBlur should be called *before* NS_BLUR_CONTENT fires
  // aPresContext is the nsPresContext receiving focus (not lost focus)
  // aContent is the nsIContent receiving focus (not lost focus)
  // aPresContext and/or aContent may be null
  static nsresult OnTextStateBlur(nsPresContext* aPresContext,
                                  nsIContent* aContent);
  // OnTextStateFocus should be called *after* NS_FOCUS_CONTENT fires
  // aPresContext is the nsPresContext receiving focus
  // aContent is the nsIContent receiving focus
  static nsresult OnTextStateFocus(nsPresContext* aPresContext,
                                   nsIContent* aContent);
  // Get the focused editor's selection and root
  static nsresult GetFocusSelectionAndRoot(nsISelection** aSel,
                                           nsIContent** aRoot);
  // This method updates the current IME state.  However, if the enabled state
  // isn't changed by the new state, this method does nothing.
  // Note that this method changes the IME state of the active element in the
  // widget.  So, the caller must have focus.
  // aNewIMEState must have an enabled state of nsIContent::IME_STATUS_*.
  // And optionally, it can have an open state of nsIContent::IME_STATUS_*.
  static void UpdateIMEState(PRUint32 aNewIMEState, nsIContent* aContent);

protected:
  static void SetIMEState(PRUint32 aState, nsIContent* aContent,
                          nsIWidget* aWidget, PRUint32 aReason);
  static PRUint32 GetNewIMEState(nsPresContext* aPresContext,
                                 nsIContent* aContent);

  static nsIWidget* GetWidget(nsPresContext* aPresContext);

  static nsIContent*    sContent;
  static nsPresContext* sPresContext;
  static bool           sInstalledMenuKeyboardListener;
  static bool           sInSecureInputMode;

  static nsTextStateManager* sTextStateObserver;
};

#endif // nsIMEStateManager_h__