i am writing some simple win32api wrappers. i have a member function called Create in the class CControl. From CControl I derive CCommandButton, CEdit, CList, CCombo, CStatic, etc. The problem that i am running into is in the Create function. Each child control takes different parameters for the window style. For example. Edit uses the style WB_BORDER, ES_LEFT. but other controls do not. Would it be more feasable to have the Create a function in each derived class instead of in the base class?? Is there a way to just use the Create in the base class, but have different params with each control that i create? that way it wont get so "messy".
this is my firt major project...and i am learning A LOT from it
anyways, here is the source of what i have so far.
ccontrols.h
#include <windows.h>
// BUTTON STYLES
#define COMMAND_BUTTON 1
#define EDIT_CONTROL 2
#define STATIC_WINDOW 3
#define RADIO_BUTTON 4
#define CHECK_BOX 5
#define LIST_BOX 6
#define COMBO_BOX 7
// CCONTROL CLASS
class CControl {
protected:
HWND hwnd ;
HINSTANCE hinst ;
int width ;
int height ;
int x_pos ;
int y_pos ;
int font_size ;
int style ;
public:
void Create(HWND parent, int instance, char* caption, int x_pos, int y_pos, int width, int height) ;
void SetFont(char* font, int size) ;
} ;
class CButtonControl : public CControl {
public:
char* GetText() ;
void SetText(char* text) ;
} ;
// CBUTTONCONTROL DERIVED CLASSES
class CCommandButton : public CButtonControl {
public:
CCommandButton() ;
} ;
class CTextBox : public CButtonControl {
public:
CTextBox() ;
} ;
class CStaticWindow : public CButtonControl {
public:
CStaticWindow() ;
} ;
class CRadioButton : public CButtonControl {
public:
CRadioButton() ;
} ;
class CCheckBox : public CButtonControl {
public:
CCheckBox() ;
} ;
// CCONTROL DERIVED CLASSES
class CListBox : public CControl {
public:
CListBox() ;
} ;
class CComboBox : public CControl {
public:
CComboBox() ;
} ;
ccontrols.cpp
#include "ccontrols.h"
// CONSTRUCTORS
CCommandButton::CCommandButton()
{
style = COMMAND_BUTTON ;
}
CTextBox::CTextBox()
{
style = EDIT_CONTROL ;
}
CStaticWindow::CStaticWindow()
{
style = STATIC_WINDOW ;
}
CRadioButton::CRadioButton()
{
style = RADIO_BUTTON ;
}
CCheckBox::CCheckBox()
{
style = CHECK_BOX ;
}
CListBox::CListBox()
{
style = LIST_BOX ;
}
CComboBox::CComboBox()
{
style = COMBO_BOX ;
}
// CControl Member Functions
void CControl::Create(HWND parent, int instance, char* caption, int x_pos, int y_pos, int width, int height)
{
switch(style)
{
case COMMAND_BUTTON:
hwnd = CreateWindow("button", caption, WS_CHILD | WS_VISIBLE, x_pos, y_pos, width, height, parent, (HMENU) instance, hinst, NULL) ;
break ;
case EDIT_CONTROL:
hwnd = CreateWindow("edit", caption, WS_CHILD | WS_VISIBLE | WS_BORDER, x_pos, y_pos, width, height, parent, (HMENU) instance, hinst, NULL) ;
break ;
case LIST_BOX:
MessageBox(NULL, "LIST_BOX", "CControl::Create", MB_OK) ;
break ;
case COMBO_BOX:
MessageBox(NULL, "COMBO_BOX", "CControl::Create", MB_OK) ;
break ;
case RADIO_BUTTON:
MessageBox(NULL, "RADIO_BUTTON", "CControl::Create", MB_OK) ;
break ;
case CHECK_BOX:
MessageBox(NULL, "CHECK_BUTTON", "CControl::Create", MB_OK) ;
break ;
}
}
void CControl::SetFont(char* font, int size)
{
HFONT hfont ;
hfont = CreateFont(size, 0,0,0,0,0,0,0,0,0,0,0,0,font) ;
SendMessage(hwnd, WM_SETFONT, (WPARAM)hfont, (LPARAM)0) ;
}
// CButtonControl Member Functions
char* CButtonControl::GetText()
{
char* buffer = NULL ;
int length ;
length = SendMessage(hwnd, WM_GETTEXTLENGTH, 0, 0) ;
buffer = new char[length] ;
SendMessage(hwnd, WM_GETTEXT, length + 1, (LPARAM)buffer) ;
return buffer ;
}
void CButtonControl::SetText(char* text)
{
SendMessage(hwnd, WM_SETTEXT, (WPARAM)0, (LPARAM)text) ;
}
main.cpp
#include "ccontrols.h"
#define BUTTON1 1
#define EDIT1 2
CCommandButton COMMAND1 ;
CTextBox TEXT1 ;
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
switch(iMsg)
{
case WM_CREATE:
{
COMMAND1.Create(hwnd, BUTTON1, "button", 10, 10 ,75, 20) ;
COMMAND1.SetFont("Verdana", 15) ;
TEXT1.Create(hwnd, EDIT1, "edit", 95, 10, 75, 20) ;
TEXT1.SetFont("verdana", 15) ;
return 0 ;
}
case WM_COMMAND:
{
switch(wParam)
{
case BUTTON1:
{
MessageBox(hwnd, TEXT1.GetText(), "Test", MB_OK) ;
COMMAND1.SetText(TEXT1.GetText()) ;
return 0 ;
}
case EDIT1:
{
return 0 ;
}
}
return 0 ;
}
case WM_DESTROY:
{
PostQuitMessage(0) ;
return 0 ;
}
}
return DefWindowProc(hwnd, iMsg, wParam, lParam) ;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
char* ClassName = "Class Name" ;
HWND hwnd ;
MSG msg ;
WNDCLASSEX WClass ;
WClass.cbSize = sizeof(WClass) ;
WClass.style = CS_HREDRAW | CS_VREDRAW ;
WClass.lpfnWndProc = WndProc ;
WClass.cbClsExtra = 0 ;
WClass.cbWndExtra = 0 ;
WClass.hInstance = hInstance ;
WClass.hIcon = LoadIcon(hInstance, IDI_APPLICATION) ;
WClass.hIconSm = LoadIcon(hInstance, IDI_APPLICATION) ;
WClass.hCursor = LoadCursor(NULL, IDC_ARROW) ;
WClass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH) ;
WClass.lpszMenuName = NULL ;
WClass.lpszClassName = ClassName ;
RegisterClassEx(&WClass) ;
hwnd = CreateWindow(ClassName, "Test", WS_OVERLAPPEDWINDOW, 0, 0, 400, 400, NULL, NULL, hInstance, NULL) ;
ShowWindow(hwnd, iCmdShow) ;
UpdateWindow(hwnd) ;
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg) ;
DispatchMessage(&msg) ;
}
return msg.wParam ;
}
Edited by - ELS1 on February 18, 2002 10:02:12 PM
Edited by - ELS1 on February 18, 2002 10:04:36 PM
