Color Dialog with Persistent Custom Colors

The MFC CColorDialog class encapulates the standard Color common dialog box. This dialog allows you to select a standard color, pick from a list of custom colors, or expand the dialog to create a color.

However, although you can define a custom color, the MFC implmentation does not save your custom colors for later use.

The following class, derived from CColorDialog, lets you do just this.

// ColorDialog.h : header file
// (c) 1997 Roger Onslow

#ifndef _CMyColorDialog_
#define _CMyColorDialog_

///////////////////////////////////////////////////////////////////////////
//
// CMyColorDialog dialog

class AFX_EXT_CLASS CMyColorDialog : public CColorDialog {
     DECLARE_DYNCREATE(CMyColorDialog);
     // Construction
public:
     CMyColorDialog( COLORREF clrInit = 0, DWORD dwFlags = 0, CWnd*
pParentWnd = NULL );
     // Statics
protected:
     enum { NCUSTCOLORS = 16 };
     static COLORREF c_CustColors[NCUSTCOLORS];
     static COLORREF c_LastCustColors[NCUSTCOLORS];
     static bool c_NeedToInitCustColors;
protected:
     static void InitCustColors();
     static void SaveCustColors();
     // Dialog Data
protected:
     //{{AFX_DATA(CMyColorDialog)
     //}}AFX_DATA
     // Overrides
protected:
     // ClassWizard generate virtual function overrides
     //{{AFX_VIRTUAL(CMyColorDialog)
public:
     virtual int DoModal();
protected:
     virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
     //}}AFX_VIRTUAL
     // Implementation
protected:
     // Generated message map functions
     //{{AFX_MSG(CMyColorDialog)
     //}}AFX_MSG
     DECLARE_MESSAGE_MAP()
};

#endif








///////////////////////////////////////////////////////////////////////////
// ColorDialog.cpp - auto load/save of custom colors CColorDialog extension
// (c) 1997 Roger Onslow

#include "stdafx.h"
#include "ColorDialog.h"

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

///////////////////////////////////////////////////////////////////////////
//
// CMyColorDialog property page

IMPLEMENT_DYNCREATE(CMyColorDialog, CColorDialog)

bool CMyColorDialog::c_NeedToInitCustColors = true;
COLORREF CMyColorDialog::c_CustColors[];
COLORREF CMyColorDialog::c_LastCustColors[];

#define SECTION _T("Custom Colors")

void CMyColorDialog::InitCustColors() {
     for (int i = 0; i < NCUSTCOLORS; i++) {
          CString entry; entry.Format("%d",i);
          c_LastCustColors[i] = c_CustColors[i] =
		::AfxGetApp()->GetProfileInt(SECTION,entry,RGB(255,255,255));
     }
     c_NeedToInitCustColors= false;
}

void CMyColorDialog::SaveCustColors() {
     for (int i = 0; i < NCUSTCOLORS; i++) {
          if (c_LastCustColors[i] != c_CustColors[i]) {
               CString entry; entry.Format("%d",i);
               if (c_CustColors[i] == RGB(255,255,255)) {
                    ::AfxGetApp()->WriteProfileString(SECTION,entry,NULL);
               } else {
                    ::AfxGetApp()->WriteProfileInt(SECTION, entry,c_CustColors[i]);
               }
               c_LastCustColors[i] = c_CustColors[i];
          }
     }
}

CMyColorDialog::CMyColorDialog( COLORREF clrInit, DWORD dwFlags, 
		CWnd* pParentWnd) : CColorDialog(clrInit,dwFlags,pParentWnd)
{
     //{{AFX_DATA_INIT(CMyColorDialog)
     //}}AFX_DATA_INIT
     if (c_NeedToInitCustColors) {
          InitCustColors();
     }
     m_cc.lpCustColors = c_CustColors;
}

int CMyColorDialog::DoModal() {
     int code = CColorDialog::DoModal();
     SaveCustColors();
     return code;
}

void CMyColorDialog::DoDataExchange(CDataExchange* pDX) {
     // overridden (calls this base class)
     CColorDialog::DoDataExchange(pDX);
     //{{AFX_DATA_MAP(CMyColorDialog)
     //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMyColorDialog, CColorDialog)
//{{AFX_MSG_MAP(CMyColorDialog)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()



Comments

  • Why not a demo project

    Posted by Legacy on 12/04/2003 12:00am

    Originally posted by: cey

    Why not creating a demo project? It takes much time to implement the codes.

    Reply
  • need a project to resolve implementation problems

    Posted by Legacy on 07/20/1999 12:00am

    Originally posted by: Greg Franz

    I have run into a number of problems trying to implement this into a project. Is there any way that you could provide an implementation project.

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Companies undertaking an IT project need to find the right balance between cost and functionality. It's important to start by determining whether to build a solution from scratch, buy an out-of-the-box solution, or a combination of both. In reality, most projects will require some system tailoring to meet business requirements. Decision-makers must understand how much software development is enough and craft a detailed implementation plan to ensure the project's success. This white paper examines the different …

  • The mobile market is white hot. Building a well-crafted product development plan that addresses market research, strategy, design, and development will provide the greatest chance for success. Each phase of an app's lifecycle is critical to the its overall success and feeds into the next step of the process of product development for the app. This white paper examines the five key phases of mobile app creation, one by one, to understand how they work together to help create a successful mobile app.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date