wxWidgets/include/wx/osx/cocoa/dataview.h

/////////////////////////////////////////////////////////////////////////////
// Name:        wx/osx/cocoa/dataview.h
// Purpose:     wxDataViewCtrl native implementation header for carbon
// Author:
// Copyright:   (c) 2009
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_DATAVIEWCTRL_COCOOA_H_
#define _WX_DATAVIEWCTRL_COCOOA_H_

#include "wx/defs.h"

#import <Cocoa/Cocoa.h>

#include "wx/osx/core/dataview.h"
#include "wx/osx/private.h"

// Forward declaration
class wxCocoaDataViewControl;

/*
    Dramatis personae:

    [vertical arrows indicate inheritance, horizontal -- aggregation]


        wxWindow ---> wxWidgetCocoaImpl  wxDataViewWidgetImpl   NSOutlineView
            |                 \                  /                   |
            |                  \                /                    |
            |                   \              /                     |
            v                   \/            \/                     v
     wxDataViewCtrl -------> wxCocoaDataViewControl <-------> wxCocoaOutlineView


     The right most classes are Objective-C only and can't be used from (pure)
     C++ code.
 */

// ============================================================================
// wxPointerObject: simply stores a pointer, without taking its ownership
// ============================================================================

// Two pointer objects are equal if the containing pointers are equal. This
// means also that the hash value of a pointer object depends only on the
// stored pointer.

@interface wxPointerObject : NSObject
{
    void* pointer;
}

    -(id) initWithPointer:(void*)initPointer;

    -(void*) pointer;
    -(void)  setPointer:(void*)newPointer;
@end

// ============================================================================
// wxSortDescriptorObject: helper class to use native sorting facilities
// ============================================================================

@interface wxSortDescriptorObject : NSSortDescriptor<NSCopying>
{
    wxDataViewColumn* columnPtr; // pointer to the sorting column

    wxDataViewModel* modelPtr; // pointer to model
}

    -(id)
    initWithModelPtr:(wxDataViewModel*)initModelPtr
        sortingColumnPtr:(wxDataViewColumn*)initColumnPtr
        ascending:(BOOL)sortAscending;

    -(wxDataViewColumn*) columnPtr;
    -(wxDataViewModel*) modelPtr;

    -(void) setColumnPtr:(wxDataViewColumn*)newColumnPtr;
    -(void) setModelPtr:(wxDataViewModel*)newModelPtr;
@end

// ============================================================================
// wxDataViewColumnNativeData: extra data for wxDataViewColumn
// ============================================================================

class wxDataViewColumnNativeData
{
public:
    wxDataViewColumnNativeData() : m_NativeColumnPtr(NULL)
    {
    }

    wxDataViewColumnNativeData(NSTableColumn* initNativeColumnPtr)
        : m_NativeColumnPtr(initNativeColumnPtr)
    {
    }

    NSTableColumn* GetNativeColumnPtr() const
    {
        return m_NativeColumnPtr;
    }

    void SetNativeColumnPtr(NSTableColumn* newNativeColumnPtr)
    {
        m_NativeColumnPtr = newNativeColumnPtr;
    }

private:
    // not owned by us
    NSTableColumn* m_NativeColumnPtr;
};

// ============================================================================
// wxDataViewRendererNativeData: extra data for wxDataViewRenderer
// ============================================================================

class wxDataViewRendererNativeData
{
public:
    wxDataViewRendererNativeData()
        : m_Object(NULL), m_ColumnCell(NULL)
    {
        Init();
    }

    wxDataViewRendererNativeData(NSCell* initColumnCell)
        : m_Object(NULL), m_ColumnCell([initColumnCell retain])
    {
        Init();
    }

    wxDataViewRendererNativeData(NSCell* initColumnCell, id initObject)
        : m_Object([initObject retain]), m_ColumnCell([initColumnCell retain])
    {
        Init();
    }

    ~wxDataViewRendererNativeData()
    {
        [m_ColumnCell release];
        [m_Object release];

        [m_origFont release];
        [m_origTextColour release];
    }

    NSCell* GetColumnCell() const { return m_ColumnCell; }
    NSTableColumn* GetColumnPtr() const { return m_TableColumnPtr; }
    id GetItem() const { return m_Item; }
    NSCell* GetItemCell() const { return m_ItemCell; }
    id GetObject() const { return m_Object; }

    void SetColumnCell(NSCell* newCell)
    {
        [newCell retain];
        [m_ColumnCell release];
        m_ColumnCell = newCell;
    }
    void SetColumnPtr(NSTableColumn* newColumnPtr)
    {
        m_TableColumnPtr = newColumnPtr;
    }
    void SetItem(id newItem)
    {
        m_Item = newItem;
    }
    void SetItemCell(NSCell* newCell)
    {
        m_ItemCell = newCell;
    }
    void SetObject(id newObject)
    {
        [newObject retain];
        [m_Object release];
        m_Object = newObject;
    }

    // The original cell font and text colour stored here are NULL by default
    // and are only initialized to the values retrieved from the cell when we
    // change them from wxCocoaOutlineView:willDisplayCell:forTableColumn:item:
    // which calls our SaveOriginalXXX() methods before changing the cell
    // attributes.
    //
    // This allows us to avoid doing anything for the columns without any
    // attributes but still be able to restore the correct attributes for the
    // ones that do.
    NSFont *GetOriginalFont() const { return m_origFont; }
    NSColor *GetOriginalTextColour() const { return m_origTextColour; }

    void SaveOriginalFont(NSFont *font)
    {
        m_origFont = [font retain];
    }

    void SaveOriginalTextColour(NSColor *textColour)
    {
        m_origTextColour = [textColour retain];
    }

    // The ellipsization mode which we need to set for each cell being rendered.
    void SetEllipsizeMode(wxEllipsizeMode mode) { m_ellipsizeMode = mode; }
    wxEllipsizeMode GetEllipsizeMode() const { return m_ellipsizeMode; }

    // Set the line break mode for the given cell using our m_ellipsizeMode
    void ApplyLineBreakMode(NSCell *cell);

private:
    // common part of all ctors
    void Init();

    id m_Item;   // item NOT owned by renderer

    // object that can be used by renderer for storing special data (owned by
    // renderer)
    id m_Object;

    NSCell* m_ColumnCell; // column's cell is owned by renderer
    NSCell* m_ItemCell;   // item's cell is NOT owned by renderer

    NSTableColumn* m_TableColumnPtr; // column NOT owned by renderer

    // we own those if they're non-NULL
    NSFont *m_origFont;
    NSColor *m_origTextColour;

    wxEllipsizeMode m_ellipsizeMode;
};

// ============================================================================
// wxCocoaOutlineDataSource
// ============================================================================

// This class implements the data source delegate for the outline view.
// As only an informal protocol exists this class inherits from NSObject only.
//
// As mentioned in the documentation for NSOutlineView the native control does
// not own any data. Therefore, it has to be done by the data source.
// Unfortunately, wxWidget's data source is a C++ data source but
// NSOutlineDataSource requires objects as data. Therefore, the data (or better
// the native item objects) have to be stored additionally in the native data
// source.
// NSOutlineView requires quick access to the item objects and quick linear
// access to an item's children. This requires normally a hash type of storage
// for the item object itself and an array structure for each item's children.
// This means that basically two times the whole structure of wxWidget's model
// class has to be stored.
// This implementation is using a compromise: all items that are in use by the
// control are stored in a set (from there they can be easily retrieved) and
// owned by the set. Furthermore, children of the last parent are stored
// in a linear list.
//
@interface wxCocoaOutlineDataSource : NSObject <NSOutlineViewDataSource>
{
    // descriptors specifying the sorting (currently the array only holds one
    // object only)
    NSArray* sortDescriptors;

    NSMutableArray* children; // buffered children

    NSMutableSet* items; // stores all items that are in use by the control

    wxCocoaDataViewControl* implementation;

    wxDataViewModel* model;

    // parent of the buffered children; the object is owned
    wxPointerObject* currentParentItem;
}

    // methods of informal protocol:
    -(BOOL)
    outlineView:(NSOutlineView*)outlineView
        acceptDrop:(id<NSDraggingInfo>)info
        item:(id)item
        childIndex:(NSInteger)index;

    -(id)
    outlineView:(NSOutlineView*)outlineView
        child:(NSInteger)index
        ofItem:(id)item;

    -(id)
    outlineView:(NSOutlineView*)outlineView
        objectValueForTableColumn:(NSTableColumn*)tableColumn
        byItem:(id)item;

    -(BOOL)
    outlineView:(NSOutlineView*)outlineView
        isItemExpandable:(id)item;

    -(NSInteger)
    outlineView:(NSOutlineView*)outlineView
        numberOfChildrenOfItem:(id)item;

    -(NSDragOperation)
    outlineView:(NSOutlineView*)outlineView
        validateDrop:(id<NSDraggingInfo>)info
        proposedItem:(id)item
        proposedChildIndex:(NSInteger)index;

    -(BOOL)
    outlineView:(NSOutlineView*)outlineView
        writeItems:(NSArray*)items
        toPasteboard:(NSPasteboard*)pasteboard;

    // buffer for items handling
    -(void)             addToBuffer:(wxPointerObject*)item;
    -(void)             clearBuffer;
    // returns the item in the buffer that has got the same pointer as "item",
    // if such an item does not exist nil is returned
    -(wxPointerObject*) getDataViewItemFromBuffer:(const wxDataViewItem&)item;
    -(wxPointerObject*) getItemFromBuffer:(wxPointerObject*)item;
    -(BOOL)             isInBuffer:(wxPointerObject*)item;
    -(void)             removeFromBuffer:(wxPointerObject*)item;

    // buffered children handling
    -(void)             clearChildren;
    -(wxPointerObject*) getChild:(NSUInteger)index;
    -(NSUInteger)       getChildCount;

    // buffer handling
    -(void) clearBuffers;

    // sorting
    -(NSArray*) sortDescriptors;
    -(void)     setSortDescriptors:(NSArray*)newSortDescriptors;

    // access to wxWidgets variables
    -(wxPointerObject*) currentParentItem;
    -(wxCocoaDataViewControl*) implementation;
    -(wxDataViewModel*) model;
    -(void) setCurrentParentItem:(wxPointerObject*)newCurrentParentItem;
    -(void) setImplementation:(wxCocoaDataViewControl*)newImplementation;
    -(void) setModel:(wxDataViewModel*)newModel;

    // other methods
    -(void)
    bufferItem:(wxPointerObject*)parentItem
        withChildren:(wxDataViewItemArray*)dataViewChildrenPtr;
@end

// ============================================================================
// wxCustomCell: used for custom renderers
// ============================================================================

@interface wxCustomCell : NSTextFieldCell
{
}

    -(NSSize) cellSize;
@end

// ============================================================================
// wxImageTextCell
// ============================================================================
//
// As the native cocoa environment does not have a cell displaying an icon/
// image and text at the same time, it has to be implemented by the user.
// This implementation follows the implementation of Chuck Pisula in Apple's
// DragNDropOutline sample application.
// Although in wxDataViewCtrl icons are used on OSX icons do not exist for
// display. Therefore, the cell is also called wxImageTextCell.
// Instead of displaying images of any size (which is possible) this cell uses
// a fixed size for displaying the image. Larger images are scaled to fit
// into their reserved space. Smaller or not existing images use the fixed
// reserved size and are scaled if necessary.
//
@interface wxImageTextCell : NSTextFieldCell
{
@private
    CGFloat xImageShift;    // shift for the image in x-direction from border
    CGFloat spaceImageText; // space between image and text

    NSImage* image; // the image itself

    NSSize imageSize; // largest size of the image; default size is (16, 16)

    // the text alignment is used to align the whole cell (image and text)
    NSTextAlignment cellAlignment;
}

    -(NSTextAlignment) alignment;
    -(void) setAlignment:(NSTextAlignment)newAlignment;

    -(NSImage*) image;
    -(void) setImage:(NSImage*)newImage;

    -(NSSize) imageSize;
    -(void) setImageSize:(NSSize) newImageSize;

    -(NSSize) cellSize;
@end

// ============================================================================
// wxCocoaOutlineView
// ============================================================================

@interface wxCocoaOutlineView : NSOutlineView <NSOutlineViewDelegate>
{
@private
    // column and row of the cell being edited or -1 if none
    int currentlyEditedColumn,
        currentlyEditedRow;

    wxCocoaDataViewControl* implementation;
}

    -(wxCocoaDataViewControl*) implementation;
    -(void) setImplementation:(wxCocoaDataViewControl*) newImplementation;
@end

// ============================================================================
// wxCocoaDataViewControl
// ============================================================================

// This is the internal interface class between wxDataViewCtrl (wxWidget) and
// the native source view (Mac OS X cocoa).
class wxCocoaDataViewControl : public wxWidgetCocoaImpl,
                               public wxDataViewWidgetImpl
{
public:
    // constructors / destructor
    wxCocoaDataViewControl(wxWindow* peer,
                           const wxPoint& pos,
                           const wxSize& size,
                           long style);
    virtual ~wxCocoaDataViewControl();

    wxDataViewCtrl* GetDataViewCtrl() const
    {
        return static_cast<wxDataViewCtrl*>(GetWXPeer());
    }

    // column related methods (inherited from wxDataViewWidgetImpl)
    virtual bool ClearColumns();
    virtual bool DeleteColumn(wxDataViewColumn* columnPtr);
    virtual void DoSetExpanderColumn(wxDataViewColumn const* columnPtr);
    virtual wxDataViewColumn* GetColumn(unsigned int pos) const;
    virtual int GetColumnPosition(wxDataViewColumn const* columnPtr) const;
    virtual bool InsertColumn(unsigned int pos, wxDataViewColumn* columnPtr);
    virtual void FitColumnWidthToContent(unsigned int pos);

    // item related methods (inherited from wxDataViewWidgetImpl)
    virtual bool Add(const wxDataViewItem& parent, const wxDataViewItem& item);
    virtual bool Add(const wxDataViewItem& parent,
                     const wxDataViewItemArray& items);
    virtual void Collapse(const wxDataViewItem& item);
    virtual void EnsureVisible(const wxDataViewItem& item,
                               wxDataViewColumn const* columnPtr);
    virtual void Expand(const wxDataViewItem& item);
    virtual unsigned int GetCount() const;
    virtual wxRect GetRectangle(const wxDataViewItem& item,
                                wxDataViewColumn const* columnPtr);
    virtual bool IsExpanded(const wxDataViewItem& item) const;
    virtual bool Reload();
    virtual bool Remove(const wxDataViewItem& parent,
                        const wxDataViewItem& item);
    virtual bool Remove(const wxDataViewItem& parent,
                        const wxDataViewItemArray& item);
    virtual bool Update(const wxDataViewColumn* columnPtr);
    virtual bool Update(const wxDataViewItem& parent,
                        const wxDataViewItem& item);
    virtual bool Update(const wxDataViewItem& parent,
                        const wxDataViewItemArray& items);

    // model related methods
    virtual bool AssociateModel(wxDataViewModel* model);

    //
    // selection related methods (inherited from wxDataViewWidgetImpl)
    //
    virtual wxDataViewItem GetCurrentItem() const;
    virtual void SetCurrentItem(const wxDataViewItem& item);
    virtual wxDataViewColumn *GetCurrentColumn() const;
    virtual int  GetSelectedItemsCount() const;
    virtual int  GetSelections(wxDataViewItemArray& sel)   const;
    virtual bool IsSelected(const wxDataViewItem& item) const;
    virtual void Select(const wxDataViewItem& item);
    virtual void SelectAll();
    virtual void Unselect(const wxDataViewItem& item);
    virtual void UnselectAll();

    //
    // sorting related methods
    //
    virtual wxDataViewColumn* GetSortingColumn () const;
    virtual void Resort();

    //
    // other methods (inherited from wxDataViewWidgetImpl)
    //
    virtual void DoSetIndent(int indent);
    virtual void HitTest(const wxPoint& point,
                         wxDataViewItem& item,
                         wxDataViewColumn*& columnPtr) const;
    virtual void SetRowHeight(const wxDataViewItem& item, unsigned int height);
    virtual void OnSize();
    
    virtual void StartEditor( const wxDataViewItem & item, unsigned int column );

    // drag & drop helper methods
    wxDataFormat GetDnDDataFormat(wxDataObjectComposite* dataObjects);
    wxDataObjectComposite* GetDnDDataObjects(NSData* dataObject) const;

    // Cocoa-specific helpers
    id GetItemAtRow(int row) const;

private:
    void InitOutlineView(long style);

    wxCocoaOutlineDataSource* m_DataSource;

    wxCocoaOutlineView* m_OutlineView;
};

#endif // _WX_DATAVIEWCTRL_COCOOA_H_