UP-DOWN Control

最新推荐文章于 2022-12-29 14:03:04 发布

原创最新推荐文章于 2022-12-29 14:03:04 发布 · 234 阅读

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#win32 up-down control

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本文介绍了一个Windows UI编程示例，展示了如何使用WM_NOTIFY消息处理水平和垂直滚动条的更改，并更新编辑框中的数值。代码详细解释了滚动条操作及数值限制。

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case WM_NOTIFY:
switch(wParam){
case (WPARAM)IDC_VERTICAL_SPIN:
InitPaperPosition(hdlg, lParam, GetDlgItem(hdlg, IDC_SURFACE_POS_X));
break;
case (WPARAM)IDC_HORIZONTAL_SPIN:
InitPaperPosition(hdlg, lParam, GetDlgItem(hdlg, IDC_SURFACE_POS_Y));
break;
}
return FALSE;

OOL InitPaperPosition(HWND hdlg,LPARAM lParam,HWND hEdit)
{
double d = 0;
char str[32];
char str2[32] = "0";
LPNMUPDOWN lpnmud;
lpnmud=(LPNMUPDOWN)lParam;

if (lpnmud->hdr.code==UDN_DELTAPOS){
GetWindowText(hEdit,str,(int)sizeof(str));
d=atof(str);
if((lpnmud->iDelta)<0) {
d+=0.1;
}else if((lpnmud->iDelta)>0) {
d-=0.1;
}
sprintf(str,"%.1lf",d);

if(d > 50.0) {
SetWindowText(hEdit,"-50.0");
return TRUE;
}else if(d < -50.0) {
SetWindowText(hEdit,"50.0");
return TRUE;
}

PrePaperPosSetting(d,str,str2,hEdit);

return TRUE;
}
return FALSE;
}

VOID PrePaperPosSetting(double d,char *str,char *str2,HWND hEdit)
{
char *p;
char *q;
int i,j;

if (d > 0) {
p = str;
if ( * (p + 1) == '.') {
strcat_s(str2, 32, str);
SetWindowText(hEdit, str2);
} else {
SetWindowText(hEdit, str);
}
} else if (d < 0) {
p = str;
if ( * (p + 2) == '.') {
i = 0;
p = p + 1;
while (str[i] != '\0') i++;
j = i;
i--;
q = & str[i];
while (q >= p) {
str[j] = * q;
q--;
j--;
}
* p = '0';
str[i + 2] = '\0';
SetWindowText(hEdit, str);
} else {
SetWindowText(hEdit, str);
}
} else {
SetWindowText(hEdit, "00.0");
}
}