Giáo trình lập trình C cho Winform- P11

Bài 4: Hộp thọai và điều khiển

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Trần Minh Thái

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM
wParam, LPARAM lParam)
{
static HINSTANCE hInstance ;
PAINTSTRUCT ps ;
switch (message)
{
case WM_CREATE:
hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;
return 0 ;
case WM_COMMAND:

switch (LOWORD (wParam))
{
case IDC_SHOW:
if (DialogBox (hInstance, TEXT ("DIALOG"),
hwnd, DialogProc))
InvalidateRect (hwnd, NULL, TRUE) ;
return 0 ;
}
break;
case WM_PAINT:
BeginPaint (hwnd, &ps) ;
EndPaint (hwnd, &ps) ;
PaintWindow (hwnd, iCurrentColor, iCurrentFigure,
iCurrenBrush) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
BOOL CALLBACK DialogProc (HWND hDlg, UINT message, WPARAM
wParam, LPARAM lParam)
{
static HWND hCtrlBlock ;
static int iColor, iFigure,iBrush;
switch (message)
{
case WM_INITDIALOG:
iColor = iCurrentColor ;

iFigure = iCurrentFigure ;
iBrush = iCurrenBrush;
CheckRadioButton(hDlg,IDC_BLACK,IDC_WHITE,
iColor);

Bài giảng: Lập trình C for Win .............................................................................................Trang 51/69


Bài 4: Hộp thọai và điều khiển

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Trần Minh Thái

CheckRadioButton(hDlg,IDC_RECT,IDC_ELLIPSE,iFig

ure);CheckRadioButton (hDlg, IDC_HS_BDIAGONAL,
IDC_HS_VERTICAL, iBrush);
hCtrlBlock = GetDlgItem (hDlg, IDC_PAINT) ;
SetFocus (GetDlgItem (hDlg, iColor)) ;
return FALSE ;
case WM_COMMAND:
switch (LOWORD (wParam))
{
case IDOK:
iCurrentColor = iColor ;
iCurrentFigure = iFigure ;
iCurrenBrush = iBrush;
EndDialog (hDlg, TRUE) ;
return TRUE ;
case IDCANCEL:
EndDialog (hDlg, FALSE) ;
return TRUE ;
case IDC_BLACK:
case IDC_RED:
case IDC_GREEN:
case IDC_YELLOW:
case IDC_BLUE:
case IDC_MAGENTA:
case IDC_CYAN:
case IDC_WHITE:
iColor = LOWORD (wParam) ;
CheckRadioButton (hDlg, IDC_BLACK,
IDC_WHITE, LOWORD (wParam)) ;
PaintTheBlock (hCtrlBlock, iColor,
iFigure,iBrush);

return TRUE ;
case IDC_RECT:
case IDC_ELLIPSE:
iFigure = LOWORD (wParam) ;
CheckRadioButton (hDlg, IDC_RECT,
IDC_ELLIPSE, LOWORD (wParam)) ;
PaintTheBlock (hCtrlBlock, iColor,
iFigure,iBrush);
return TRUE ;
case IDC_HS_BDIAGONAL:
case IDC_HS_CROSS:
case IDC_HS_DIAGCROSS:
case IDC_HS_FDIAGONAL:
case IDC_HS_HORIZONTAL:
case IDC_HS_VERTICAL:

Bài giảng: Lập trình C for Win .............................................................................................Trang 52/69


Bài 4: Hộp thọai và điều khiển

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Trần Minh Thái

iBrush = LOWORD (wParam)
CheckRadioButton(hDlg,IDC_HS_BDIAGONAL,
IDC_HS_VERTICAL, LOWORD (wParam)) ;
PaintTheBlock (hCtrlBlock, iColor,
iFigure,iBrush);
return TRUE ;
}
break;
case WM_PAINT:
PaintTheBlock (hCtrlBlock, iColor, iFigure,iBrush) ;
break ;
}
return FALSE ;
}
d)

Hộp thoại không trạng thái

™

Hiển thị hộp thoại
HWND hDlgModeless=CreateDialog(hInstance, szTemplate,

hwndParent, DialogProc);
ShowWindow(hDlgModeless,SW_SHOW);
while(GetMessage(&msg, NULL, 0, 0))
{
if (hDlgModeless==0 || !IsDialogMessage
(hDlgModeless, &msg);
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

™

while(GetMessage(&msg, NULL, 0, 0))
{
if (hDlgModeless==0 || !IsDialogMessage(hDlgModeless,
&msg);
{
if(TranslateAccelerator (hwnd, hAccel, &msg)
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
}
Đóng hộp thoại
Đặt hDlgModeless về giá trị 0.

Bài giảng: Lập trình C for Win .............................................................................................Trang 53/69

Bài 4: Hộp thọai và điều khiển

™

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Trần Minh Thái

BOOL DestroyWindow(
HWND hWnd // handle to window to destroy
);
Ví dụ

void PaintWindow (HWND hwnd, int iColor[], int iFigure)
{
HBRUSH hBrush ;
HDC hdc ;
RECT rect ;
hdc = GetDC(hwnd) ;
GetClientRect (hwnd, &rect) ;
hBrush = CreateSolidBrush(RGB(iColor[0], iColor[1],
iColor[2]));
hBrush = (HBRUSH) SelectObject (hdc, hBrush) ;
if (iFigure == IDC_RECT)
Rectangle (hdc, rect.left, rect.top, rect.right,
rect.bottom) ;
else
Ellipse(hdc, rect.left, rect.top, rect.right,
rect.bottom) ;
DeleteObject (SelectObject (hdc, hBrush)) ;
ReleaseDC (hwnd, hdc) ;

}
LRESULT CALLBACK WndProc (HWND hwnd, UINT
message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_PAINT:
PaintTheBlock(hwnd, iColor, iFigure) ;
return 0 ;
case WM_DESTROY :

Bài giảng: Lập trình C for Win .............................................................................................Trang 54/69


Bài 4: Hộp thọai và điều khiển

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Trần Minh Thái

DeleteObject((HGDIOBJ)SetClassLong(hw
nd, GCL_HBRBACKGROUND,(LONG)
GetStockObject (WHITE_BRUSH))) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam,
lParam);
}
void PaintTheBlock (HWND hCtrl, int iColor[], int iFigure)
{
InvalidateRect (hCtrl, NULL, TRUE);
UpdateWindow (hCtrl) ;
PaintWindow (hCtrl, iColor, iFigure) ;
}
BOOL CALLBACK ColorScrDlg (HWND hDlg, UINT
message, WPARAM wParam, LPARAM lParam)
{
HWND hwndParent, hCtrl ;
static HWND hCtrlBlock ;
int iCtrlID, iIndex ;
switch (message)
{
case WM_INITDIALOG :
hCtrlBlock = GetDlgItem (hDlg,

IDC_PAINT) ;
for (iCtrlID = 10 ; iCtrlID < 13 ; iCtrlID++)
{
hCtrl = GetDlgItem (hDlg, iCtrlID) ;
PaintTheBlock (hCtrlBlock, iColor,
iFigure) ;
PaintTheBlock (hwndParent, iColor,
iFigure) ;
SetScrollRange (hCtrl, SB_CTL, 0,
255, FALSE) ;
SetScrollPos(hCtrl, SB_CTL, 0,
FALSE) ;
}
return TRUE ;
case WM_COMMAND:
{
switch( LOWORD(wParam))
{
case IDC_RECT:
case IDC_ELLIPSE:
iFigure = LOWORD(wParam);

Bài giảng: Lập trình C for Win .............................................................................................Trang 55/69