WIN32API custom color drop-down list control, win32api Control

Source: Internet
Author: User

WIN32API custom color drop-down list control, win32api Control

The effect is as follows:

Original-Reprinted from famous sources

1. Create a Color Attribute Class "CNColor ":

Class CNColor {public: COLORREF m_crColor; // color RGB value WCHAR m_cColor [32]; // color name CNColor (COLORREF cr, WCHAR * crStr );~ CNColor () ;}; CNColor: CNColor (COLORREF cr, WCHAR * crStr) {this-> m_crColor = cr; lstrcpyn (m_cColor, crStr, 32);} CNColor ::~ CNColor (){}

2. Create a color list control class "CNColorList ":

Class CNColorList {public: HWND m_mHwnd; list <CNColor *> m_mColors; // color list private:
// Initialize the color list void InitalColorArray (); public: CNColorList ();~ CNColorList (); // create the control int Creat (HWND hwnd, // HINSTANCE hinst, // global UINT uid, // control number RECT rec // control box size); // Control Message Processing static lresult callback NColorListProc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam ); // draw the subitem void DrawItem (HDC hdc, int itmId, RECT rec); // obtain the string CNColor * GetColorById (int nid );};


3. Create a class pointer class "CNColorListPtr"

// Save class pointer class CNColorListPtr {public: UINT mUid; // ID CNColorList * pColorList = NULL; // color list pointer WNDPROC 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 list void CNColorList: InitalColorArray () {m_mColors.push_back (new CNColor (RGB (0xF0, 0xF8, 0xFF), L "AliceBlue ")); m_mColors.push_back (new CNColor (RGB (0xFA, 0xEB, 0xD7), L "AntiqueWhite"); m_mColors.push_back (new CNColor (RGB (0x00, 0xFF, 0xFF ), L "Aqua"); m_mColors.push_back (new CNColor (RGB (0x7F, 0xFF, 0xD4), L "Aquamarine"); m_mColors.push_back (new CNColor (RGB (0xF0, 0xFF, 0xFF), L "Azure"); m_mColors.push_back (new CNColor (RGB (0xF5, 0xF5, 0xDC), L "Beige"); m_mColors.push_back (new CNColor (RGB (0xFF, 0xE4, 0xC4), L "Bisque"); m_mColors.push_back (new CNColor (RGB (0x00, 0x00, 0x00), L "Black "));}


5. Create a control window

// Create ColorListint CNColorList: 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., hwnd, (HMENU) uid, hinst, NULL); WNDPROC nProc = (WNDPROC) SetWindowLong (hwn D, GWL_WNDPROC, (LONG) NColorListProc); // bind the control event handler CNColorListPtr * mptr = new CNColorListPtr (uid, this, nProc); SetWindowLong (hwnd, GWL_USERDATA, (LONG) mptr); // Save the current window pointer list <CNColor *>: iterator ite; for (ite = m_mColors.begin (); ite! = M_mColors.end (); ite ++) {// add string ComboBox_AddString (m_mHwnd, (LPARAM) (CNColor *) (* ite)-> m_cColor );} return 0 ;}


6. Define message processing:

// Message Processing lresult callback CNColorList: NColorListProc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {CNColorListPtr * ptr = (CNColorListPtr *) GetWindowLong (hwnd, GWL_USERDATA ); // obtain the window pointer WNDPROC nProc = ptr-> mProc; int idx; WCHAR str [32]; switch (msg) {case WM_DRAWITEM: {if (wParam = ptr-> mUid) {ptr-> pColorList-> DrawItem (LPDRAWITEMSTRUCT) lParam)-> hDC, (LPDRAWITEMSTRUCT) lParam)-> itemID, (LPDRAWITEMSTRUCT) lParam)-> rcItem);} break;} default: break;} return CallWindowProc (nProc, hwnd, msg, wParam, lParam ); // send the message to the main window}


7. Draw the drop-down table ITEM

// Draw the subitem void CNColorList: DrawItem (HDC hdc, int itmId, RECT rec) {if (itmId =-1) return; CNColor * mc = GetColorById (itmId ); // create pen HPEN 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. Call the control in the main program

8.1 define the Control ID

  #define IDB_CRLIST 8000

8.2 create a control object

CNColorList nCr = CNColorList();

8.3 create a control in message WM_CREAT

case WM_CREATE:        nCr.Creat(            hwnd,             (HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE),            IDB_CRLIST,            { 20,20,160,180 }        );        break;

Original-Reprinted from famous sources

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