ngiter.h

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// $Id: ngiter.h 751 2006-03-31 15:43:49Z alex $
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 */
/*
    $Header: /Camelot/kernel/ngiter.h 2     8/11/99 12:06 Justinf $
    Classes to iterate through the objects in the document and over Attribute gallery
    groups and items.
*/

#ifndef NGITER_H
#define NGITER_H

class Node;
class UndoableOperation;
class SGNameGroup;
class SGNameItem;


/***********************************************************************************************
>   class CCAPI NodeScan

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    27/7/99
    Purpose:    Abstract base class for scans over sequences of nodes.
    SeeAlso:    NameGallery; NodeScan::Source
***********************************************************************************************/

class CCAPI NodeScan
{
public:
    /******************************************************************************************
    >   class CCAPI NodeScan::Source

        Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
        Created:    27/7/99
        Purpose:    Abstract base class for interfaces to SelRanges, Document trees etc whose
                    nodes can be scanned over.
        Notes:      If your derived class defines data members then remember to define a copy
                    constructor and consider concurrency issues!
    ******************************************************************************************/
    class CCAPI Source
    {
    public:
        // Creation & destruction.
        virtual ~Source()               { /* empty */ }
        virtual Node* GetFirst() = 0;
        virtual Node* GetNext(Node* pLastNode) = 0;
    };

    // Creation & destruction.
    NodeScan(Source* ps);
    virtual ~NodeScan();

    // Scan through the source's nodes.
    BOOL Scan();

protected:
    // Called before, during and after the scan through the document's tree.
    virtual BOOL Pre();
    virtual BOOL Do(Node* pNode) = 0;
    virtual BOOL Post();

private:
    // Data.
    Source* m_pSource;      // where to get the nodes to scan
};



/********************************************************************************************
>   class CCAPI UndoableNodeScan : public NodeScan

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    21/11/96
    Purpose:    Base class for NodeScans which are used by UndoableOperations.
********************************************************************************************/

class CCAPI UndoableNodeScan : public NodeScan
{
public:
    UndoableNodeScan(UndoableOperation* pOp, Source* ps);
    
protected:
    UndoableOperation* m_pOp;
};



/***********************************************************************************************
>   class CCAPI DocTreeSource : public NodeScan::Source
    class CCAPI SelectDocSource : public DocTreeSource

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    27/7/99
    Purpose:    Concretisation of NodeScan::Source for all NodeRenderableInks in a
                document's object tree (generally), or in the 'selected' document's
                tree (specifically).
***********************************************************************************************/

class CCAPI DocTreeSource : public NodeScan::Source
{
public:
    // Creation & destruction.
    DocTreeSource(BaseDocument* pDoc = 0);

protected:
    virtual Node* GetFirst();
    virtual Node* GetNext(Node*);

    BaseDocument* m_pDoc;           // the document whose tree is to be scanned
};


class CCAPI SelectDocSource : public DocTreeSource
{
protected:
    virtual Node* GetFirst();
};



/***********************************************************************************************
>   class CCAPI RangeSource : public NodeScan::Source
    class CCAPI SelectObjSource : public RangeSource

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    27/7/99
    Purpose:    Concretisation of NodeScan::Source for all NodeRenderableInks in a Range
                (generally), or in the Application's SelRange object (specifically).
***********************************************************************************************/

class CCAPI RangeSource : public NodeScan::Source
{
public:
    // If pRange is supplied then use pRange, otherwise use Application::FindSelection.
    RangeSource(Range* pRange = 0);

protected:
    virtual Node* GetFirst();
    virtual Node* GetNext(Node*);

    Range* m_pRange;                // the range to be scanned
};


class CCAPI SelectObjSource : public RangeSource
{
protected:
    virtual Node* GetFirst();
};



/***********************************************************************************************
>   class CCAPI NotSelectSource : public SelectDocSource

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    27/7/99
    Purpose:    Concretisation of NodeScan::Source for all NodeRenderableInks NOT in the
                application's selection range.
***********************************************************************************************/

class CCAPI NotSelectSource : public SelectDocSource
{
protected:
    virtual Node* GetFirst();
    virtual Node* GetNext(Node*);
};



/***********************************************************************************************
>   class CCAPI SingleNodeSource : public NodeScan::Source
    class CCAPI SetSentinelSource : public SingleNodeSource

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    27/7/99
    Purpose:    Concretisation of NodeScan::Source for a "scan" over a single node
                (generally), and over the 'selected' document's NodeSetSentinel sentinel
                (specifically).
***********************************************************************************************/

class CCAPI SingleNodeSource : public NodeScan::Source
{
public:
    SingleNodeSource(Node* pNode = 0);

protected:
    virtual Node* GetFirst();
    virtual Node* GetNext(Node*);

    Node* m_pNode;
};


class CCAPI SetSentinelSource : public SingleNodeSource
{
protected:
    virtual Node* GetFirst();   
};



/***********************************************************************************************
>   extern SelectDocSource      theSelectedDocument;
    extern SelectObjSource      theSelectedObjects;
    extern NotSelectSource      theUnselectedObjects;
    extern SetSentinelSource    theSetSentinel;

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    27/7/99
    Purpose:    Predefined sources for NodeScans: the nodes in the tree of the 'selected'
                document; the nodes in the application's selection; the unselected nodes
                in the tree of the 'selected' document; the special NodeSetSentinel
***********************************************************************************************/

extern SelectDocSource      theSelectedDocument;
extern SelectObjSource      theSelectedObjects;
extern NotSelectSource      theUnselectedObjects;
extern SetSentinelSource    theSetSentinel;



/***********************************************************************************************
>   class CCAPI NameGroupIter

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    27/7/99
    Purpose:    Base classes for iterations and searches over all groups and all items in
                the name gallery.
***********************************************************************************************/

class CCAPI NameGroupIter
{
public:
    virtual ~NameGroupIter() { }
    // Calls Do() for each group in the name gallery.
    virtual SGNameGroup* ForEach();

private:
    // Returns TRUE if sucessful and iteration should continue.
    virtual BOOL Do(SGNameGroup* pGroup) = 0;
};



/***********************************************************************************************
>   class CCAPI NameItemIter

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    27/7/99
    Purpose:    Abstract base classes for iterations and searches over all groups and all
                items in the Name gallery.
***********************************************************************************************/

class CCAPI NameItemIter
{
public:
    virtual ~NameItemIter() { }
    // Only iterate over particular items - just highlighted ones, or just those of
    // the 'Used Names' group.
    enum Mask { ALL_ITEMS, ALL_NAMES, HIGHLIGHTED_ITEMS, HIGHLIGHTED_NAMES };
    NameItemIter(Mask mask = ALL_ITEMS);

    // Calls Do() for each item in the name gallery.
    virtual SGNameItem* ForEach();

protected:
    // Helper function for ForEach, above.
    SGNameItem* ForEachItem(SGNameGroup* pGroup);

private:
    // Returns TRUE if sucessful and iteration should continue.
    virtual BOOL Do(SGNameItem* pItem) = 0;
    Mask m_eMask;
};



/***********************************************************************************************
>   class CCAPI NameIterOp : public NameItemIter

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    27/7/99
    Purpose:    Specialisation of base class to combine a node and an operation.
***********************************************************************************************/

class CCAPI NameIterOp : public NameItemIter
{
public:
    NameIterOp(Node* pNode, UndoableOperation* pOp = 0, Mask mask = HIGHLIGHTED_NAMES);

protected:
    Node* m_pNode;
    UndoableOperation* m_pOp;
};

#endif  /* !NGITER_H */

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