la_base.h

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// $Id: la_base.h 1282 2006-06-09 09:46:49Z alex $
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 */
/*

    la_base.h

    Line-attribute operations.
*/

#ifndef LA_BASE_H
#define LA_BASE_H

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


/********************************************************************************************
>   class ChangeLineAttribOpDesc : public UndoableOpDescriptor

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    4/3/95
    Purpose:    Abstract base-class OpDescriptor to allow the user to change a line-attribute
                of all selected objects, or to set the AttributeManager's current attribute
                if no objects are selected.

                The OpDescriptor invokes the OpApplyAttribToSelected operation if nodes
                are selected.
********************************************************************************************/

class OpChangeLineAttribOpDesc : public UndoableOpDescriptor
{
public:
    // Creation & destruction.
    OpChangeLineAttribOpDesc(UINT32 nTxtID, const TCHAR* lpcszToken,
                             UINT32 nBubbleID, UINT32 nControlID);   

    // Initialise the gadget.
    virtual void OnControlCreate(OpDescControlCreateMsg* CreateMsg);
    
    // Message handlers.
    virtual void OnSelectionChange(OpDescControlMsg* SelChangedMsg, List* GadgetList);
    virtual BOOL OnDocChangingMsg(Document* pChangingDoc, DocChangingMsg::DocState State);
    // This fn is now redundant (replaced by OnCommonAttrsChangedMsg)
    //virtual BOOL OnSelChangingMsg(SelChangingMsg::SelectionState State);
    virtual BOOL OnCommonAttrsChangedMsg();

    // GetState function for the OpDescriptor
    static OpState GetState(String_256* Description, OpDescriptor*); 

protected:
    // This functions sets the given text in all gadgets associated with this OpDescriptor.
    void SetGadgetText(const String& str);

    // This function handles setting the text within the combo (to do this it calls the above
    // SetGadgetText function).  In extreme cases you can override this.
    virtual BOOL SetCurrentSelectedAttrib();
    
    // Derived classes must provide these functions.  This one returns the run-time class
    // of the attribute the derived class is interested in.
    virtual CCRuntimeClass* GetAttribRuntimeClass() const = 0;
    
    // This one returns a string ID which describes the given attribute.
    virtual UINT32 ConvertAttribToStringID(NodeAttribute* pAttr) const = 0;
    
    // This one returns the string ID of the text to put in the combo-box at the given
    // index (position), or 0 if there isn't any item at the given index.
    virtual UINT32 GetItemStringID(INT32 nItemIndex) const = 0;
    
    // This one converts the given combo index position into a pointer to the appropriate
    // kind of attribute.
    virtual NodeAttribute* GetNewAttrib(INT32 nItemIndex) const = 0;
};

#endif  // !LA_BASE_H

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