keypress.h

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// $Id: keypress.h 1282 2006-06-09 09:46:49Z alex $
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 */
// Definition of the KeyPress class

#ifndef INC_KEYPRESS
#define INC_KEYPRESS

//#include "listitem.h" - in camtypes.h [AUTOMATICALLY REMOVED]

enum KeyPressSysMsgHandle
{
    KM_KEYUP,
    KM_KEYDOWN,
    KM_CHAR
};


// This is the first in the range of privat Unicodes that Camelot will use to encode keys that do
// not have direct Unicode equivalents
#define CAMELOT_UNICODE_BASE (0xf800)
#define CAMELOT_UNICODE_LAST (0xf94f)




/********************************************************************************************
>   class AdditionalVirtKey: public ListItem

    Author:     Peter_Arnold (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/10/95
    Purpose:    Used to store 'additional' known virtual key codes so the range of handled
                keys can be extended at runtime
********************************************************************************************/

class AdditionalVirtKey: public ListItem
{
public:                
    UINT32 VirtualKeyCode;
    WCHAR UnicodeValue;
};         


/********************************************************************************************

>   class KeyPressSysMsg: public CC_CLASS_MEMDUMP

    Author:     Mark_Neves (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/8/94
    Purpose:    Represents a key press message that is slightly more abstract than the raw
                Windows message.
                This will hopefully aid the porting of this code to other platforms

********************************************************************************************/

class KeyPressSysMsg : public CC_CLASS_MEMDUMP
{
    CC_DECLARE_MEMDUMP(KeyPressSysMsg);

public:
    KeyPressSysMsg( wxKeyEvent *pMsg );
    BOOL IsValid();

    KeyPressSysMsgHandle Message;       // The message type, KM_ something

    UINT32              VirtKey;        // Virtual key code describing the actual key that's been pressed
    UINT32              RepeatCount;    // The repeat count for the key before message was posted
    UINT32              ScanCode;       // Keyboard scan code. Depends on keyboard manufacturer
#if FALSE != wxUSE_UNICODE
    wxChar              m_Char;         // The character code
#endif

    BOOL Extended   : 1;            // Set when an extended key was press (e.g. right-hand Alt or Ctrl)
    BOOL PrevDown   : 1;            // Set when the key was down before the key press message was sent

private:
    BOOL Valid : 1;

    // VirtKey of last keypress, used to detect repeated keys
    static UINT32 m_LastVirtKey;
};

/********************************************************************************************

>   class KeyPress: public CC_CLASS_MEMDUMP

    Author:     Mark_Neves (Xara Group Ltd) <camelotdev@xara.com>
    Created:    24/8/94
    Purpose:    Encapsulates key presses in camelot

********************************************************************************************/

class KeyPress : public CC_CLASS_MEMDUMP
{
    CC_DECLARE_MEMDUMP(KeyPress);

public:
    static BOOL Init();
    static FilePath GetHotKeysFilename();
    static BOOL DispatchKeyEvent(UINT32 nMsgID, UINT32 nChar, UINT32 nRepCnt, UINT32 nFlags);
    static BOOL TranslateMessage( wxKeyEvent *pMsg );
    static void ResetModifierKeys();
    static BOOL GenerateCharMessage( wxKeyEvent *pMsg );

    // These all allow key states to be tested asynchronously, ie. without a key event happening.
    static BOOL IsAdjustPressed();
    static BOOL IsConstrainPressed();
    static BOOL IsAlternativePressed();
    static BOOL IsEscapePressed();
    static BOOL IsKeyPressed(UINT32 VirtKey);       // General async keypress func call.

    // ModifierChange() will return TRUE if the last keypress message was due to a modifier key state change
    static BOOL ModifierChanged() { return fModifierChanged; }

    // These are special methods for galleries, as they must emulate Windows list boxes
    // They should not be used outside the gallery system unless you're really really sure
    static BOOL IsGalleryShiftPressed(void);
    static BOOL IsGalleryCtrlPressed(void);

    // The constructors
    KeyPress(KeyPressSysMsg* pKeySysMsg,WCHAR UnicodeChar);
    KeyPress(UINT32 VirtKey, BOOL PlusAdjust = FALSE, BOOL PlusConstrain = FALSE, BOOL PlusAlternative = FALSE,
                           BOOL ExtendedKey = FALSE, BOOL WorksInDragsKey = FALSE);
    KeyPress(const KeyPress &c): // Copy constructor as CCObject's is private which prevents synthesis working
        VirtKey(c.VirtKey), Unicode(c.Unicode), Adjust(c.Adjust), Constrain(c.Constrain),
        Alternative(c.Alternative), Option(c.Option), Extended(c.Extended), Repeat(c.Repeat),
        RightHand(c.RightHand), Valid(c.Valid) {}

    static KeyPress* ConstructVK(TCHAR ch);

    // Lets you find out if the key press is a valid one
    BOOL IsValid();

    // Discover the key-related bits with these lovely public funcs
    UINT32  GetVirtKey()    { return VirtKey; } // Returns the virtual key code
    WCHAR   GetUnicode()    { return Unicode; } // Returns the unicode char generated by the virtual key

    // Public access functions to the various flags of a key press (see later for flag descriptions)
    BOOL IsAdjust()         { return Adjust; }
    BOOL IsConstrain()      { return Constrain; }
    BOOL IsAlternative()    { return Alternative; }
    BOOL IsOption()         { return Option; }
    BOOL IsModified()       { return (IsAdjust() || IsConstrain() || IsAlternative() || IsOption()); }

    BOOL IsExtended()       { return Extended; }
    BOOL IsRepeat()         { return Repeat; }
    BOOL IsRightHand()      { return RightHand; }
    BOOL IsRelease()        { return Release; }
    BOOL IsChar()           { return m_fIsChar; }
    BOOL IsPress()          { return !m_fIsChar && !Release; }
    BOOL IsOkInDrags()      { return WorksInDrag; }

    // The all-important equivalence operator
    // Main users of this are HotKey and ToolSwitch, which need to do key combination comparisons
    // Note: this does NOT compare the Unicode element of KeyPress objects.
    //       To do this you'll have to do pKeyPress1->GetUnicode() == pKeyPress2->GetUnicode()
    //       This is because the same unicode char could theoretically be produced by different
    //       key combinations, so a full comparison of two key presses may produce "not equal" when
    //       they have the same unicode char.
    INT32 operator==(const KeyPress& ); 

#if defined(_DEBUG) && defined(__WXMSW__)
    static void DumpKeyMessage(wxKeyEvent* pMsg);
#endif

    static BOOL AddVirtualKeyCode(UINT32 VCode, WCHAR Unicode);
    static void RemoveVirtualKeyCode(UINT32 VCode, WCHAR Unicode);

private:
    // The default constuctor is private in order to force others to use one of the public constructors
    // or static member functions to create an instance of KeyPress
    KeyPress();
    void Initialise();

    static BOOL         GenerateKeyPress( wxKeyEvent *pMsg,KeyPress **ppKeyPress );
    static INT32        GenerateUnicode(UINT32 VirtKey,UINT32 ScanCode,BYTE* pKeyState,WCHAR* pWideCharBuf,UINT32 WideCharBufSize);
    static BOOL         IgnoreKeyMessage(KeyPressSysMsg* pKeySysMsg);
    static BOOL         IsModifier(UINT32 VirtKey);
    static void         UpdateModifierStatus(KeyPressSysMsg* pKeySysMsg);
    static KeyPress*    MakeKeyPress(KeyPressSysMsg* pKeySysMsg);
    static BOOL         EscapePressed(KeyPress* pKeyPress);

    UINT32  VirtKey;            // The virtual key code for the key
    WCHAR Unicode;          // The Unicode char that the virtual key generates

    BOOL Adjust      : 1;   // Key press modified by the Adjust modifier (usu. shift)
    BOOL Constrain   : 1;   // Key press modified by the Constrain modifier (usu. ctrl)
    BOOL Alternative : 1;   // Key press modified by the Alternative modifier (usu. alt)
    BOOL Option      : 1;   // Key press modified by the Option modifier (usu. Mac option key)

    BOOL Extended    : 1;   // The key was one of the extended keys (e.g. right-hand ctrl key)

    BOOL Repeat      : 1;   // The key press was generated by an auto-repeat (i.e. not the original keypress)
    BOOL RightHand   : 1;   // The key press was generated by a right-hand equivelent (e.g. 'Enter' and not 'Return')
    BOOL Release     : 1;   // The key has just been released (e.g. Windows KEYUP event)
    BOOL m_fIsChar   : 1; 

    BOOL Valid       : 1;   // Validity bit. Set means object is ok, clear means DON'T TOUCH IT!
    BOOL WorksInDrag : 1;   // TRUE if this keypress will work in the middle of a drag

    // These next vars hold the current state of the various modifier keys.
    // TRUE means the key is down, FALSE means the key is up
    static BOOL AdjustStateLeft;
    static BOOL AdjustStateRight;
    static BOOL ConstrainStateLeft;
    static BOOL ConstrainStateRight;
    static BOOL AlternativeStateLeft;
    static BOOL AlternativeStateRight;
    static BOOL OptionStateLeft;
    static BOOL OptionStateRight;

    // TRUE if the one or more of the modifier keys changed on the last keypress
    static BOOL fModifierChanged;

    // This info is used to generate WM_CHAR messages via Alt and the numerical key pad
    static INT32 AsciiVal;
    static BOOL ValidAsciiVal;

    // The last Lead Byte recived
    static BYTE LastLeadByte;

    // One list of additional runtime virtual key codes
    static List AdditionalVirtKeys;

};

#endif  // INC_KEYPRESS

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