layerdlg.cpp

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// $Id: layerdlg.cpp 1282 2006-06-09 09:46:49Z alex $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
                    Copyright (C) 1993-2006 Xara Group Ltd.
       Copyright on certain contributions may be held in joint with their
              respective authors. See AUTHORS file for details.

LICENSE TO USE AND MODIFY SOFTWARE
----------------------------------

This file is part of Xara LX.

Xara LX is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License version 2 as published
by the Free Software Foundation.

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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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-----------------

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License described above, Xara Group Ltd grants to you certain additional
rights. 

The additional rights are to use, modify, and distribute the software
together with the wxWidgets library, the wxXtra library, and the "CDraw"
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----------------

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      Xara Group Ltd, Gaddesden Place, Hemel Hempstead, HP2 6EX, UK.
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=================================XARAHEADEREND============================
 */

// Implementation of the LayerDlg class

/* 
*/ 

#include "camtypes.h" 
//#include "ensure.h"   - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "errors.h"  - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "dlgtypes.h"  - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "resource.h"   
//#include "barsdlgs.h"
//#include "simon.h"
//#include "dialogop.h" // DialogOp header  - in camtypes.h [AUTOMATICALLY REMOVED]
#include "dlgmgr.h"   // Dialog manager class    
#include "layerdlg.h"   
#include "mainfrm.h"
//#include "msg.h" - in camtypes.h [AUTOMATICALLY REMOVED]
#include "layermgr.h"

CC_IMPLEMENT_DYNCREATE(LayerDlg, DialogOp)   

const CDlgMode LayerDlg::Mode = MODELESS;           // The dialog is modeless  
const INT32      LayerDlg::IDD  = _R(IDD_LAYERDLG);     // The dialogs ID

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

>   LayerDlg::LayerDlg(): DialogOp(LayerDlg::IDD, LayerDlg::Mode) 


    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    13/12/93
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    LayerDlg constructor. Creates a non-undoable operation
    Errors:     -
    SeeAlso:    -

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

LayerDlg::LayerDlg(): DialogOp(LayerDlg::IDD, LayerDlg::Mode) 
{   

}        

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

>   MsgResult LayerDlg::Message( CDlgMessage DlgMsg, CGadgetID Gadget)

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    13/12/93
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Handles all the Layer dialog's messages 
    Errors:     -
    SeeAlso:    -

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

MsgResult LayerDlg::Message(Msg* Message)
{
    if (IS_OUR_DIALOG_MSG(Message))
    {
        DialogMsg* Msg = (DialogMsg*)Message;
        
        BOOL EndDialog = FALSE; 
        switch (Msg->DlgMsg)
        {
            case DIM_COMMIT:
            {
                EndDialog = ValidValues(); 
                if (EndDialog)
                {
                    // commit all changes made 
                    //(Document::GetCurrent()->GetLayerMgr()).CommitLayerChanges(); 
                    // Reflect changes in rest of interface 
                    //(Document::GetCurrent()->GetLayerMgr()).UpdateInterface();       
                }
                break;
            }
            case DIM_SOFT_COMMIT:
            {
                TRACE( _T("Rgt OK handling here\n"));
                break; 
            }
            case DIM_CANCEL:
            {
                // Cancel all changes made to the Layers 
                //if((Document::GetCurrent()->GetLayerMgr()).CancelLayerChanges())
                //{ 
                //  EndDialog = TRUE; 
                //}
                // else InformError will have been called 
                break;
            }
            case DIM_LFT_BN_CLICKED:
            {
                switch (Msg->GadgetID)
                {
                    case _R(IDC_NEW):
                        CreateNewLayer(); 
                        break; 
                    case _R(IDC_DELETE):
                        DeleteSelectedLayer(); 
                        break; 
                    default:        
                        ChangeAttribute(Msg->GadgetID); 
                }
                break; 
            }
            case  DIM_SELECTION_CHANGED_COMMIT:
            {
                if (Msg->GadgetID == _R(IDC_LAYER_LIST))
                {
                    // A double click, make the Layer active 
                    // Obtain the index of the selected item
                    GetValueIndex(_R(IDC_LAYER_LIST), &SelectedLyrIndex);
                    SetSelectedLayer(SelectedLyrIndex); // Sets the selected Layer 
                    SetSelectedLayerActive(); 
                    // Update the dialog to show the new Layers details 
                    ShowLayerDetails();     
                }
                break;
            }
            case DIM_SELECTION_CHANGED:
            {
                if (Msg->GadgetID == _R(IDC_LAYER_LIST))
                {
                    // User clicked on new Layer 
                    // Obtain the index of the selected item
                    GetValueIndex(_R(IDC_LAYER_LIST), &SelectedLyrIndex); 

                    SetSelectedLayer(SelectedLyrIndex); // Sets the selected Layer 

                    // Update the dialog to show the new Layers details 
                    ShowLayerDetails();     
                }
                break;  
            }
            case DIM_TEXT_CHANGED:
            {
                if (Msg->GadgetID == _R(IDC_LAYER_ID))
                {
                    // User is editing the Layer identifier 
                    UpdateLayerID(); 
                    break; 
                }
            }
        }

        if (EndDialog)  // Dialog communication over 
        {
            Close(); // Close the dialog 
            End();  // Destroy dialog 
        //  CMainFrame::pInfoBar->EnableLayerControl(); // Enable the infobar's Layer control 
        }
//      return (DLG_EAT_IF_HUNGRY(Msg)); 
    }
//  return OK;

    // Pass everything on to the base class . . .
    return DialogOp::Message(Message);
}  


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

>   void LayerDlg::DeleteSelectedLyr()

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/1/94
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Deletes the selected Layer 
    Errors:     -
    SeeAlso:    -

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

void LayerDlg::DeleteSelectedLayer()
{
    ENSURE(NumLayers > 1, "It is illegal delete the final Layer on a spread");
    // Delete the selected Layer from the Layer list 
    DeleteValue(_R(IDC_LAYER_LIST), FALSE, SelectedLyrIndex); 

    // Flag the Layer as having been deleted 
    SelectedLyr->Deleted = TRUE; 
    
    // If there is a Layer with a z-order one greater than this Layer, then this becomes the 
    // selected Layer. Else the Layer with a z-order one less becomes the selected Layer. 

     if ( (SelectedLyrIndex+1) != NumLayers )
     {
        // There is a Layer with a z-order one greater so select this  
        do
        {
            ENSURE(SelectedLyr != NULL, "Selected Layer is NULL"); 
            //SelectedLyr = (LyrDetails*)((Document::GetCurrent()->GetLayerMgr()).LyrDetList.GetNext(SelectedLyr));    
        } while ( ((LyrDetails*)SelectedLyr)->Deleted );
        // Note there is no need to change the SelectedLyrIndex
     }
     else 
     {
        // Select the Layer which has a z-order one less
        do
        {
            ENSURE(SelectedLyr != NULL, "Selected Layer is NULL"); 
            //SelectedLyr = (LyrDetails*)((Document::GetCurrent()->GetLayerMgr()).LyrDetList.GetPrev(SelectedLyr));    
        } while ( ((LyrDetails*)SelectedLyr)->Deleted );
        SelectedLyrIndex--;  
     }
     ENSURE(SelectedLyr != NULL, "Selected Layer does not exist"); 
     SetSelectedValueIndex(_R(IDC_LAYER_LIST), SelectedLyrIndex); // Select the active Layer 
     NumLayers--; 
     ShowLayerDetails(); 


}

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

>   void LyrMgr::UpdateLyrID()

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    13/1/94
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Updates the  identifier 
    Scope:      private 
    Errors:     -
    SeeAlso:    -

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

void LayerDlg::UpdateLayerID()
{
    BOOL Valid; 
    String_256 TempStr; 
    TempStr = GetStringGadgetValue(_R(IDC_LAYER_ID), &Valid); 
    // Only update if the string has really changed 
    if (TempStr != SelectedLyr->Status.StringLayerID)
    {
        // Update the selected layer's details  
        SelectedLyr->Status.StringLayerID = TempStr; 
        ENSURE(Valid, "Error when trying to read a string value");
        // Replace the list box string with the updated string 
        GadgetRedraw(_R(IDC_LAYER_LIST),FALSE); // Turn off drawing until we have finished making changes 
        DeleteValue(_R(IDC_LAYER_LIST), FALSE, SelectedLyrIndex); // Delete old value 
        SetStringGadgetValue(_R(IDC_LAYER_LIST),&(SelectedLyr->Status.StringLayerID), FALSE, SelectedLyrIndex); 
        // Reset the selection 
        SetSelectedValueIndex(_R(IDC_LAYER_LIST), SelectedLyrIndex); // Select the active layer 
        GadgetRedraw(_R(IDC_LAYER_LIST),TRUE);  
    }
}

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

>   BOOL LayerDlg::CreateNewLayer()

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    13/1/94
    Inputs:     -
    Outputs:    -
    Returns:    TRUE if successful, else FALSE
    Purpose:    Creates a new layer, adding it to the end of the layer details list. If a new
                layer could not be allocated then InformError is called then FALSE returned. 
    Errors:     -
    Scope:      private
    SeeAlso:    -

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

BOOL LayerDlg::CreateNewLayer()
{
    LyrDetails* LayerDet; 
    LayerDet = new LyrDetails(); 
    if (LayerDet == NULL)
    {
        // Inform the error to the user. The error message is set by new
        InformError(); 
        return FALSE; 
    }

    // Initialise default layer values 
    LayerDet->Layer = NULL;     // Because the layer node has not yet been created !
    LayerDet->New = TRUE;       // A new layer 
    LayerDet->Deleted = FALSE; 

    // Default attribute values 
    //LayerDet->Status.Flags.Visible = TRUE; 
    //LayerDet->Status.Flags.Locked = FALSE; 
    //LayerDet->Status.Flags.Active = FALSE; 
    //LayerDet->Status.Flags.Printable = TRUE; 
    //LayerDet->Status.Flags.Background = FALSE; 

    //LayerDet->Status.StringLayerID = Document::GetCurrent()->GetLayerMgr().CreateUniqueLayerID();
    //LayerDet->Status.LayerQualityLevel = 11; 

    // Add the new layer details record to the tail of the layer details list 
    //(Document::GetCurrent()->GetLayerMgr()).LyrDetList.AddTail(LayerDet); 

    NumLayers++;
    SelectedLyr = LayerDet; // Make the new layer the selected layer 
    SelectedLyrIndex = NumLayers-1; 

    // Update the layer list gadget 
    
    // Add layerID to end of list box 
    SetStringGadgetValue(_R(IDC_LAYER_LIST),&(SelectedLyr->Status.StringLayerID)); 
    SetSelectedValueIndex(_R(IDC_LAYER_LIST), SelectedLyrIndex); // Select the new layer  

    ShowLayerDetails(); 

    return TRUE; 
}

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

>   void LayerDlg::SetSelectedLayer(WORD Index)   

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    12/1/94
    Inputs:     Index:  List index of new selected layer 
    Outputs:    -
    Returns:    -
    Purpose:    Sets the Indexth layer in the list to be the selected layer   
    Errors:     -
    SeeAlso:    -

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

void LayerDlg::SetSelectedLayer(WORD Index)   
{
/*
    // Find the Indexth layer  
    // Traverse the Layer Manager's LyrDetList and add all layer identifiers to the list gadget
    List* LyrList = &((Document::GetCurrent()->GetLayerMgr()).LyrDetList); 
    ListItem* CurLayerDet = LyrList->GetHead();  
    ENSURE(CurLayerDet != NULL, "The LyrDetList is empty"); 

    WORD i =0; 

    while (CurLayerDet != NULL)
    {
        if (! (((LyrDetails*)CurLayerDet)->Deleted) )   // The layer has not been deleted 
        {
            if (i ==  Index)
            {
                // Found 
                SelectedLyr = (LyrDetails*)CurLayerDet; 
                return; 
            }
            i++; 
        }
        CurLayerDet = LyrList->GetNext(CurLayerDet); 
    
    }
    ENSURE(FALSE, "Could not find layer to select"); 
*/
}

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

>   void LayerDlg::ChangeAttribute(CGadgetID Gadget)

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/1/94
    Inputs:     Gadget: Gadget ID for the attribute 
    Outputs:    -
    Returns:    -
    Purpose:    Handles a request to change an attribute of the layer 
    Scope:      private 
    Errors:     -
    SeeAlso:    -

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

void LayerDlg::ChangeAttribute(CGadgetID Gadget)
{
    switch (Gadget)
    {
        case _R(IDC_VISIBLE):
            //SelectedLyr->Status.Flags.Visible = !(SelectedLyr->Status.Flags.Visible);  
            break; 
        case _R(IDC_LOCKED):
            //SelectedLyr->Status.Flags.Locked = !(SelectedLyr->Status.Flags.Locked); 
            break; 
        case _R(IDC_ACTIVE): 
        
            SetSelectedLayerActive(); 
            break; 
        case _R(IDC_GLOBAL):
            // Don't know if we are to implement global or not 
            //SelectedLyr->Status.Flags.Global = !(SelectedLyr->Status.Flags.Global);  
            break; 
        case _R(IDC_PRINTABLE):
            //SelectedLyr->Status.Flags.Printable = !(SelectedLyr->Status.Flags.Printable);  
            break; 
        case _R(IDC_BACKGROUND):
            //SelectedLyr->Status.Flags.Background = !(SelectedLyr->Status.Flags.Background);  
            break; 
    
    }

}

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

>   void LayerDlg::SetSelectedLayerActive()

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    24/1/94
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Sets the selected layer to be the active layer
    Errors:     -
    SeeAlso:    -

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

void LayerDlg::SetSelectedLayerActive()
{
/*
    // Traverse the Layer Manager's LyrDetList and set all Active flags to FALSE 
    List* LyrList = &((Document::GetCurrent()->GetLayerMgr()).LyrDetList); 
    ListItem* CurLayerDet = LyrList->GetHead();  
    ENSURE(CurLayerDet != NULL, "The LyrDetList is empty"); 
    while (CurLayerDet != NULL)
    {
        ((LyrDetails*)CurLayerDet)->Status.Flags.Active = FALSE; 
        CurLayerDet = LyrList->GetNext(CurLayerDet); // Get next layer detail record 
    }
    SelectedLyr->Status.Flags.Active = TRUE; 
    // Disable the Active control
    EnableGadget(_R(IDC_ACTIVE), FALSE); 
    // Disable the Delete button 
    EnableGadget(_R(IDC_DELETE), FALSE); 
    // The visible and locked controls are set to their defaults and disabled 
    SetLongGadgetValue(_R(IDC_VISIBLE), 1); 
    SetLongGadgetValue(_R(IDC_LOCKED), 0); 
    EnableGadget(_R(IDC_VISIBLE), FALSE); 
    EnableGadget(_R(IDC_LOCKED), FALSE); 
    SelectedLyr->Status.Flags.Visible = TRUE; 
    SelectedLyr->Status.Flags.Locked = FALSE;   
*/
}


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

>   BOOL LayerDlg::ValidValues()

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    2/2/94
    Inputs:     -
    Outputs:    -
    Returns:    TRUE if the values entered in the dialog are valid. 

    Purpose:    To validate the values that the user has input. If the values are not 
                valid then InformError is called to inform the user of the error. 

    Scope:      private 
    Errors:     -
    SeeAlso:    -

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

BOOL LayerDlg::ValidValues()
{
/*
    // Check that the names given to the layers are unique 
    List* LyrList = &((Document::GetCurrent()->GetLayerMgr()).LyrDetList); 
    ListItem* CurLyrDet = LyrList->GetHead(); 
    ListItem* CmpLyrDet;  
    while (CurLyrDet != NULL) 
    {
        CmpLyrDet = LyrList->GetHead(); 
        while (CmpLyrDet != NULL) 
        {
            if (CmpLyrDet != CurLyrDet) // We are not looking at the same details structure 
            {
                if (((LyrDetails*)CurLyrDet)->Status.StringLayerID == 
                    ((LyrDetails*)CmpLyrDet)->Status.StringLayerID)
                {
                    // duplicate layer names found, inform the user  
                    InformError(_R(IDS_LAYERIDS_NOT_UNIQUE)); 
                    return (FALSE); 
                }
            }
            CmpLyrDet = LyrList->GetNext(CmpLyrDet); 
        }
        CurLyrDet = LyrList->GetNext(CurLyrDet); // Get next Layer detail record 
    }
    return(TRUE); 
*/
return (TRUE);
} 


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

>   OpState LayerDlg::GetState(String_256*, OpDescriptor*)

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    13/12/93
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    LayerDlg GetState method
    Errors:     -
    SeeAlso:    -

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

OpState LayerDlg::GetState(String_256*, OpDescriptor*)
{    
    OpState OpSt;
    return(OpSt);
}
         
/********************************************************************************************

>   BOOL LayerDlg::Init()

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    13/12/93
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    LayerDlg Init method
    Errors:     -
    SeeAlso:    -

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



BOOL LayerDlg::Init()
{  
    return (TRUE);
/*
    return (RegisterOpDescriptor(
                                0,
                                _R(IDS_LAYERDLG), 
                                CC_RUNTIME_CLASS(LayerDlg),
                                OPTOKEN_LAYERDLG,
                                LayerDlg::GetState,
                                0,  // help ID
                                _R(IDBBL_LAYERDLG),
                                0   // bitmap ID
                                )); 
*/
}   
 
/********************************************************************************************

>   BOOL LayerDlg::Create()

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    13/12/93
    Inputs:     -
    Outputs:    -
    Returns:    TRUE if successful, else FALSE
    Purpose:    LayerDlg create method 
    Errors:     -
    SeeAlso:    -

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

       
BOOL LayerDlg::Create()
{                            
    ENSURE(FALSE,"The old layer dlg is now defunct!");
    return (FALSE);

    if (DialogOp::Create())
    { 
        // Set the initial control values 
        InitDialog();

        return TRUE; 
    }
    else
    {
        return FALSE; 
    }
}           

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

>   void LayerDlg::Do(OpDescriptor*)

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    13/12/93
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Creates then opens the dialog 
    Errors:     -
    SeeAlso:    -

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


void LayerDlg::Do(OpDescriptor*)
{
    ENSURE(FALSE,"The old layer dlg is now defunct!");
    return;
    if (Create())
    {
        Open();
    }
    else              // Could not create 
    {
        InformError();
        End();         // End the operation 
    }                   
}


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

>   BOOL LayerDlg::InitDialog()

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    17/12/93
    Inputs:     -
    Outputs:    -
    Returns:    -
    Purpose:    Sets initial dialog values 
    Errors:     -
    SeeAlso:    -

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


BOOL LayerDlg::InitDialog()
{   
/*
    // Make the OK button dual function 
//  DualFunctionButton(IDOK);
    
    // Common controls have currently been disabled
    //SetGadgetRange(_R(IDC_QUALITY), 1, 11); 

    // Make the Layer list box dragable so that users can change the Z order of the Layers 
    //MakeListBoxDragable(_R(IDC_Lyr_LIST));  

    GadgetRedraw(_R(IDC_LAYER_LIST),FALSE); // Turn off drawing until we have finished making changes 
                                        // to the gadget. 

    // Traverse the Layer Manager's LyrDetList and add all Layer identifiers to the list gadget
    List* LyrList = &((Document::GetCurrent()->GetLayerMgr()).LyrDetList); 
    ListItem* CurLyrDet = LyrList->GetHead();  
    ENSURE(CurLyrDet != NULL, "The LyrDetList is empty"); 

    WORD i =0; 
    NumLayers = 0; 

    while (CurLyrDet != NULL)
    {
        // Add string to end of list box 
        SetStringGadgetValue(_R(IDC_LAYER_LIST),&(((LyrDetails*)CurLyrDet)->Status.StringLayerID)); 
        
        // If the current Layer is active then make it the selected item 
        if (((LyrDetails*)CurLyrDet)->Status.Flags.Active)
        {
            SelectedLyr = (LyrDetails*)CurLyrDet; // Set the selected Layer 
            SelectedLyrIndex = i; 
        }

        CurLyrDet = LyrList->GetNext(CurLyrDet); 
        i++; 
        NumLayers++;    
    }

    GadgetRedraw(_R(IDC_LAYER_LIST),TRUE);  // Turn drawing back on 

    SetSelectedValueIndex(_R(IDC_LAYER_LIST), SelectedLyrIndex); // Select the active Layer 
    
    ShowLayerDetails();                  

    return TRUE; 
*/
return (FALSE);
} 


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

>   void LayerDlg::ShowLayerDetails()

    Author:     Simon_Maneggio (Xara Group Ltd) <camelotdev@xara.com>
    Created:    11/1/94
    Inputs:     - 
    Outputs:    -
    Returns:    -
    Purpose:    Shows Layer info for the selected Layer 
    Errors:     -
    SeeAlso:    -

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

void LayerDlg::ShowLayerDetails()
{
    ENSURE(SelectedLyr != NULL, "The Selected Layer is NULL"); 
    //SetLongGadgetValue(_R(IDC_VISIBLE), (INT32)SelectedLyr->Status.Flags.Visible ? 1: 0);
    //SetLongGadgetValue(_R(IDC_LOCKED), (INT32)SelectedLyr->Status.Flags.Locked ? 1: 0);  
    //SetLongGadgetValue(_R(IDC_ACTIVE), (INT32)SelectedLyr->Status.Flags.Active ? 1: 0);  
    SetLongGadgetValue(_R(IDC_GLOBAL), (INT32) FALSE);                  // Bodge
    //SetLongGadgetValue(_R(IDC_PRINTABLE), (INT32)SelectedLyr->Status.Flags.Printable ? 1: 0);  
    //SetLongGadgetValue(_R(IDC_BACKGROUND), (INT32)SelectedLyr->Status.Flags.Background ? 1: 0);   
    // Disable the quality gadget if global quality is set 
    SetStringGadgetValue(_R(IDC_LAYER_ID), &(SelectedLyr->Status.StringLayerID)); 
    // Disable the active, visible, and locked gadgets if the Layer is active
    //EnableGadget(_R(IDC_ACTIVE), !(SelectedLyr->Status.Flags.Active)); 
    //EnableGadget(_R(IDC_VISIBLE), !(SelectedLyr->Status.Flags.Active)); 
    //EnableGadget(_R(IDC_LOCKED), !(SelectedLyr->Status.Flags.Active)); 
    // Disable the delete gadget if the Layer is active or if there is only one Layer 
    //EnableGadget(_R(IDC_DELETE), !(SelectedLyr->Status.Flags.Active  || NumLayers == 1)); 
    return;  
}

---