Win32API a custom color drop-down list control

The effect is as follows:

Original-Reproduced please famous source

1, new Color attribute class "Cncolor":

class cncolor{public:    colorref    m_crcolor;         // color RGB Values    WCHAR        m_ccolor[];        // Color name    Cncolor (COLORREF cr, WCHAR * crstr);     ~* crstr) {this->m_crcolor =+);} Cncolor::~Cncolor () {}

2, New color List control class "Cncolorlist":

classcncolorlist{ Public: HWND M_mhwnd; List<CNColor*>m_mcolors; Color ListPrivate:
Initialize the color listvoidInitalcolorarray (); Public: Cncolorlist (); ~cncolorlist (); //Creating Controls    intCreat (HWND hwnd,//parent window handleHInstance Hinst,//Program Global handleUINT uid,//Control NumberRECT Rec//control outer frame size    ); //Control Message Handling    StaticLRESULT CALLBACK Ncolorlistproc (HWND hwnd, UINT MSG, WPARAM WPARAM, LPARAM LPARAM); //Draw the child    voidDrawItem (HDC hdc,intItmid, RECT rec); //Get Stringcncolor* Getcolorbyid (intnid);};

3, new class pointer class "Cncolorlistptr"

//Save class pointersclasscncolorlistptr{ Public: UINT muid; //ID NumberCncolorlist *pcolorlist = NULL;//Color list PointerWNDPROC Mproc;//Application Handle Public: Cncolorlistptr (UINT uid,cncolorlist*ptr, WNDPROC proc); ~cncolorlistptr ();}; Cncolorlistptr::cncolorlistptr (UINT uid, cncolorlist*ptr, WNDPROC proc) {Muid=uid; Pcolorlist=ptr; Mproc=proc;}

4, initialize the color list

//Initialize the color listvoidCncolorlist::initalcolorarray () {M_mcolors.push_back (NewCncolor (RGB (0xF0,0xF8,0xFF), L"AliceBlue")); M_mcolors.push_back (NewCncolor (RGB (0xFA,0xEB,0xD7), L"Antiquewhite")); M_mcolors.push_back (NewCncolor (RGB (0x00,0xFF,0xFF), L"Aqua")); M_mcolors.push_back (NewCncolor (RGB (0x7F,0xFF,0xd4), L"Aquamarine")); M_mcolors.push_back (NewCncolor (RGB (0xF0,0xFF,0xFF), L"Azure")); M_mcolors.push_back (NewCncolor (RGB (0xf5,0xf5,0xDC), L"Beige")); M_mcolors.push_back (NewCncolor (RGB (0xFF,0xE4,0xc4), L"Bisque")); M_mcolors.push_back (NewCncolor (RGB (0x00,0x00,0x00), L"Black"));}

5, creating the control window

//Create ColorListintCncolorlist::creat (HWND hwnd, HINSTANCE hinst, UINT uid, RECT rec) {if(m_mcolors.size () = =0) Initalcolorarray (); M_mhwnd= CreateWindow (L"ComboBox", NULL, Ws_child | ws_visible | Ws_vscroll | Cbs_dropdownlist | cbs_hasstrings |cbs_ownerdrawfixed, Rec.left, Rec.top, Rec.right-rec.left, rec.bottom-Rec.top, hwnd, (HMENU) uid, hinst, NULL); WNDPROC Nproc= (WNDPROC) SetWindowLong (hwnd, GWL_WNDPROC, (LONG) ncolorlistproc);//bound control event handlersCncolorlistptr *mptr =NewCncolorlistptr (UID, This, Nproc);        SetWindowLong (hwnd, Gwl_userdata, (LONG) mptr); //saves the current window pointerList<cncolor*>:: iterator ite;  for(ite = M_mcolors.begin (); ITE! = M_mcolors.end (); ite++)    {        //Add Stringcombobox_addstring (M_mhwnd, (LPARAM) (Cncolor*) (*ite))M_ccolor); }    return 0;}

6, define Message processing:

//Message ProcessingLRESULT CALLBACK Cncolorlist::ncolorlistproc (HWND hwnd, UINT MSG, WPARAM WPARAM, LPARAM LPARAM) {cncolorlistptr* ptr = (cncolorlistptr*) GetWindowLong (hwnd, gwl_userdata);//Get window pointerWNDPROC Nproc = ptr->Mproc; intidx; WCHAR str[ +]; Switch(msg) { CaseWm_drawitem: {if(WParam = = ptr->muid) {ptr->pcolorlist->DrawItem ((lpdrawitemstruct) lParam)-HDC, ((lpdrawitemstruct) lParam)-ItemID, ((lpdrawitemstruct) lParam)-RcItem); }         Break; }    default:         Break; }    returnCallWindowProc (Nproc, hwnd, MSG, WParam, LParam);//passing messages to the main window}

7. Draw the drop-down list item

//Draw the childvoidCncolorlist::D Rawitem (HDC hdc,intItmid, RECT rec) {    if(Itmid = =-1)return; Cncolor*MC =Getcolorbyid (Itmid); //Create a penHpen pen = CreatePen (Ps_solid,1, RGB (0,0,0)); Hbrush Brush= CreateSolidBrush (mc->M_crcolor);    SelectObject (hdc, pen);    SelectObject (hdc, brush); RECT Nrec={rec.left+1, Rec.top+1, (Rec.right+ rec.left) *0.3, Rec.bottom-1    }; FillRect (HDC,&Nrec, brush);    Rectangle (hdc, Nrec.left, Nrec.top, Nrec.right, Nrec.bottom); RECT Trec={(Rec.right+ rec.left) *0.3+4, Rec.top, Rec.right-2, Rec.bottom}; SetTextColor (hdc, RGB (0,0,0)); DrawText (HDC, MC->m_ccolor,-1, &Trec, Dt_left);    DeleteObject (pen); DeleteObject (brush);}

8, invoking the control in the main program

8.1 Defining the control ID

#define Idb_crlist 8000

8.2 New Control Object

Cncolorlist nCr = Cncolorlist ();

8.3 Creating a control in message wm_creat

 Case wm_create:        ncr.creat (            hwnd,             (HINSTANCE) GetWindowLong (hwnd, gwl_hinstance),            idb_crlist,             (a         );          break;

Original-Reproduced please famous source

Win32API a custom color drop-down list control