[C/WIN32] BOUTON BITMAP - SUBCLASSING

//Code complet, environ 80 lignes de code:



#include <windows.h>



HINSTANCE hInst; // Instance application

BOOL CALLBACK DlgProc(HWND, UINT, WPARAM, LPARAM); 



//Couleur de fond de la feuille

HDC hDC;

HBRUSH couleur_fond; //brush à la couleur RGB



// Bouttton bitmap

HWND hBtn;          // Handle du boutton bitmap (contrôle)

HBITMAP hBitmap;    // handle du bitmap         (image)

WNDPROC OldBtnProc; // Déclaration proto fonction subclassing boutton

BOOL ButtonIsOver;  // TRUE quand souris est dessus





/* -----------------------------------------------------------------------------

   Point d'entrée

------------------------------------------------------------------------------*/

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow){

    hInst=hInstance; //on met de côté le handle de l' appli

	return DialogBoxParam(hInstance, (char*)100, 0, &DlgProc, 0);

}



/* -----------------------------------------------------------------------------

   Procédure de sous-classement du boutton

------------------------------------------------------------------------------*/

LRESULT CALLBACK BtnProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

{

    switch(message){

      case WM_LBUTTONDOWN: // on clique: charge bitmap "cliqué"

             hBitmap=LoadImage(hInst,(LPCSTR)"imgdown",IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION);

             SendMessage(hBtn,STM_SETIMAGE,IMAGE_BITMAP,(LPARAM)(HBITMAP)hBitmap);        

             return TRUE;

      case WM_LBUTTONUP:

             hBitmap=LoadImage(hInst,(LPCSTR)"imgnorm",IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION);

             SendMessage(hBtn,STM_SETIMAGE,IMAGE_BITMAP,(LPARAM)(HBITMAP)hBitmap);

             PostQuitMessage(0); //fermeture!

             return TRUE;

      case WM_MOUSEMOVE:

             hBitmap=LoadImage(hInst,(LPCSTR)"imgover",IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION);

             SendMessage(hBtn,STM_SETIMAGE,IMAGE_BITMAP,(LPARAM)(HBITMAP)hBitmap);        

             ButtonIsOver=TRUE;

             return TRUE;

   }

    // et retour à la procédure originale

    return CallWindowProc(OldBtnProc, hWnd, message, wParam, lParam);

}



/* -----------------------------------------------------------------------------

   Callback fenêtre

------------------------------------------------------------------------------*/

BOOL CALLBACK DlgProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam){

    int x,y;

	switch (uMsg){



	  case WM_INITDIALOG:

            // définit variables fenêtre

               couleur_fond = CreateSolidBrush(RGB(148,183,197)); // bleu foncé

               SetWindowText(hWnd, "Boutton Bitmap"); //titre taskbar

		    // centre la fenêtre

               x = (GetSystemMetrics(SM_CXSCREEN)-200)/2;

               y = (GetSystemMetrics(SM_CYSCREEN)-200)/2;

               MoveWindow(hWnd,x,y,200,160,0);

            // subclassing du boutton: appel de la fonction de sous-classement

            hBtn = GetDlgItem(hWnd, 101); //met de côté le handle

            OldBtnProc=(WNDPROC) SetWindowLong(hBtn,GWL_WNDPROC,(LPARAM)BtnProc);

		    break;



      case WM_MOUSEMOVE:

           if (ButtonIsOver){

             hBitmap=LoadImage(hInst,(LPCSTR)"imgnorm",IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION);

             SendMessage(hBtn,STM_SETIMAGE,IMAGE_BITMAP,(LPARAM)(HBITMAP)hBitmap);        

             ButtonIsOver=FALSE;

             return TRUE;

           } break;



	  case WM_CTLCOLORDLG:return(LRESULT)couleur_fond;



      case WM_CTLCOLORSTATIC:

 			hDC = (HDC)wParam;

		    SetBkMode(hDC, TRANSPARENT);

            SetTextColor (hDC, RGB(215,236,253));//bleu clair

            return(LRESULT)couleur_fond;



	  case WM_CLOSE:

            DeleteObject(hBitmap);

		    DeleteObject(couleur_fond);

		    DeleteObject(hDC);            

		    EndDialog(hWnd,0);

	}

	return 0;

}

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