ScrollWindow滚动窗口,有动态按钮,且主窗口很大,主窗口有滚动条
(1)首先创建主窗口时,在其属性中加上:WS_HSCROLL:
hwnd = CreateWindow (szAppName, TEXT ("Button Look"),
WS_OVERLAPPEDWINDOW | WS_HSCROLL | WS_VSCROLL,//WS_HSCROLL表示有滚动条
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;//hwnd为主窗口
(2)响应WM_VSCROLL消息,在其中调用SetScrollPos()设置滚动条本身的位置,还要调用ScrollWindow()来改变使窗口中的内容滚动(如窗口中的按钮等控件,它们也会上下移动):
case WM_VSCROLL :
switch (LOWORD (wParam))
{
case SB_LINEDOWN :
iScroll_y += 10;
iDir= 1;
break ;
case SB_LINEUP :
croll_y -= 10;
iDir= -1;
break ;
}
SetScrollPos ( hwnd, SB_VERT, iScroll_y, TRUE) ;
InvalidateRect (hwnd, NULL, TRUE) ;
//ScrollWindow()可滚动窗口,窗口中客户区的内容会移动
ScrollWindow( hwnd, 0, -10* iDir, NULL, NULL );
return 0 ;
注:本程序是在windows程序设计 第5版中创建动态按钮的代码中修改而来,只是作为测试,会有bug.
全部代码如下:
#include <windows.h>
struct
{
int iStyle ;
TCHAR * szText ;
}
button[] =
{
BS_PUSHBUTTON, TEXT ("PUSHBUTTON"),
BS_DEFPUSHBUTTON, TEXT ("DEFPUSHBUTTON"),
BS_CHECKBOX, TEXT ("CHECKBOX"),
BS_AUTOCHECKBOX, TEXT ("AUTOCHECKBOX"),
BS_RADIOBUTTON, TEXT ("RADIOBUTTON"),
BS_3STATE, TEXT ("3STATE"),
BS_AUTO3STATE, TEXT ("AUTO3STATE"),
BS_GROUPBOX, TEXT ("GROUPBOX"),
BS_AUTORADIOBUTTON, TEXT ("AUTORADIO"),
BS_OWNERDRAW, TEXT ("OWNERDRAW")
} ;
#define NUM (sizeof button / sizeof button[0])
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
static int iScroll_y= 100;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("BtnLook") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("Button Look"),
WS_OVERLAPPEDWINDOW | WS_HSCROLL | WS_VSCROLL ,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HWND hwndButton[NUM] ;
static RECT rect ;
static TCHAR szTop[] = TEXT ("message wParam lParam"),
szUnd[] = TEXT ("_______ ______ ______"),
szFormat[] = TEXT ("%-16s%04X-%04X %04X-%04X"),
szBuffer[50] ;
static int cxChar, cyChar ;
HDC hdc ;
PAINTSTRUCT ps ;
int i ;
static int iDir= 1;
switch (message)
{
case WM_CREATE :
cxChar = LOWORD (GetDialogBaseUnits ()) ;
cyChar = HIWORD (GetDialogBaseUnits ()) ;
//创建动态按钮
for (i = 0 ; i < NUM ; i++)
hwndButton[i] = CreateWindow ( TEXT("button"),
button[i].szText,
WS_CHILD | WS_VISIBLE | button[i].iStyle,
cxChar, cyChar * (1 + 2 * i) * 6,
20 * cxChar, 7 * cyChar / 4,
hwnd, (HMENU) i,//i为按钮的ID号
((LPCREATESTRUCT) lParam)->hInstance, NULL) ;
return 0 ;
case WM_SIZE :
rect.left = 24 * cxChar ;
rect.top = 2 * cyChar ;
rect.right = LOWORD (lParam) ;
rect.bottom = HIWORD (lParam) ;
return 0 ;
case WM_PAINT :
InvalidateRect (hwnd, &rect, TRUE) ;
hdc = BeginPaint (hwnd, &ps) ;
SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;
SetBkMode (hdc, TRANSPARENT) ;
TextOut (hdc, 24 * cxChar, cyChar, szTop, lstrlen (szTop)) ;
TextOut (hdc, 24 * cxChar, cyChar, szUnd, lstrlen (szUnd)) ;
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_DRAWITEM :
case WM_COMMAND ://按钮事件
ScrollWindow (hwnd, 0, -cyChar, &rect, &rect) ;
hdc = GetDC (hwnd) ;
SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;
TextOut (hdc, 24 * cxChar, cyChar * (rect.bottom / cyChar - 1),
szBuffer,
wsprintf (szBuffer, szFormat,
message == WM_DRAWITEM ? TEXT ("WM_DRAWITEM") :
TEXT ("WM_COMMAND"),
HIWORD (wParam), LOWORD (wParam),
HIWORD (lParam), LOWORD (lParam))) ;
//按钮的响应事件
//if ( wParam == BS_PUSHBUTTON)
if ( LOWORD( wParam )== 0)//按钮的ID号
{
MessageBox( hwnd, TEXT("123"), TEXT("456"), 0);
}
ReleaseDC (hwnd, hdc) ;
ValidateRect (hwnd, &rect) ;
break ;
case WM_DESTROY :
PostQuitMessage (0) ;
return 0 ;
case WM_VSCROLL :
//int i = GetWindowLong ((HWND) lParam, GWL_ID) ;
switch (LOWORD (wParam))
{
// fall through
case SB_LINEDOWN :
//MessageBox( hwnd, TEXT("down"), TEXT("down456"), 0);
iScroll_y += 10;
iDir= 1;
break ;
// fall through
case SB_LINEUP :
//MessageBox( hwnd, TEXT("up"), TEXT("up456"), 0);
iScroll_y -= 10;
iDir= -1;
break ;
}
SetScrollPos ( hwnd, SB_VERT, iScroll_y, TRUE) ;
InvalidateRect (hwnd, NULL, TRUE) ;
ScrollWindow( hwnd, 0, -10* iDir, NULL, NULL );//ScrollWindow()可滚动窗口,窗口中客户区的内容会移动
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}