本文提供一个宏，可以按照通常对话框的布局要求快速为每个控件布局，对话框大小改变时，控件的大小和位置都会随之而改变。改变控件位置和大小的代码都在宏内部，你只需了解宏的作用即可达到所需布局。
注意，编写宏和测试环境为XP + VC++6.0SP6 + MFC，其他编译环境可能需对宏稍加修改，我相信你有这个实力。
// CtrlId : 控件ID
// LeftChangeMode : 0:与窗口客户区左边的距离不变; 1:按比例变化; 2:保持控件宽度不变;
// RightChangeMode : 0:与窗口客户区右边的距离不变; 1:按比例变化; 2:保持控件宽度不变;
// TopChangeMode : 0:与窗口客户区上边的距离不变; 1:按比例变化; 2:保持控件高度不变;
// BottomChangeMode : 0:与窗口客户区下边的距离不变; 1:按比例变化; 2:保持控件高度不变;
#ifndef AUTO_SET_CONTROL_POS
// LeftChangeMode取值宏定义
#define LEFT_CHANGE_MODE_FIXED_LEFTPADDING 0
#define LEFT_CHANGE_MODE_RATIO 1
#define LEFT_CHANGE_MODE_FIXED_WIDTH 2
// RightChangeMode取值宏定义
#define RIGHT_CHANGE_MODE_FIXED_RIGHTPADDING 0
#define RIGHT_CHANGE_MODE_RATIO 1
#define RIGHT_CHANGE_MODE_FIXED_WIDTH 2
// TopChangeMode取值宏定义
#define TOP_CHANGE_MODE_FIXED_TOPPADDING 0
#define TOP_CHANGE_MODE_RATIO 1
#define TOP_CHANGE_MODE_FIXED_HEIGHT 2
// BottomChangeMode取值宏定义
#define BOTTOM_CHANGE_MODE_FIXED_LEFEPADDING 0
#define BOTTOM_CHANGE_MODE_RATIO 1
#define BOTTOM_CHANGE_MODE_FIXED_HEIGHT 2
#define AUTO_SET_CONTROL_POS(CtrlId, LeftChangeMode, RightChangeMode, TopChangeMode, BottomChangeMode)\
{\
static int nFirstCtrlId = -1;\
static CRect rectLastClientWindow;\
static CRect rectLastClientWindowTmp;\
if (-1 == nFirstCtrlId)\
{\
nFirstCtrlId = CtrlId;\
}\
if (nFirstCtrlId == CtrlId)\
{\
rectLastClientWindowTmp = rectLastClientWindow;\
}\
rectLastClientWindow.right = cx;\
rectLastClientWindow.bottom = cy;\
CWnd *pWndDlgItem = GetDlgItem(CtrlId);\
if (pWndDlgItem)\
{\
CRect rectDlgItem;\
pWndDlgItem->GetWindowRect(rectDlgItem);\
ScreenToClient(rectDlgItem);\
\
static int nDefaultLeftPadding_##CtrlId = rectDlgItem.left;\
static float fDefaultLeftRatio_##CtrlId = (float)rectDlgItem.left\
/ rectLastClientWindowTmp.right;\
static int nDefaultRightPadding_##CtrlId = rectLastClientWindowTmp.right\
- rectDlgItem.right;\
static float fDefaultRightRatio_##CtrlId = (float)rectDlgItem.right\
/ rectLastClientWindowTmp.right;\
static int nDefaultCtrlWidth_##CtrlId = rectDlgItem.right - rectDlgItem.left;\
int nXChangeMode = (LeftChangeMode << 8) + RightChangeMode;\
\
static int nDefaultTopPadding_##CtrlId = rectDlgItem.top;\
static float fDefaultTopRatio_##CtrlId = (float)rectDlgItem.top\
/ rectLastClientWindowTmp.bottom;\
static int nDefaultBottomPadding_##CtrlId = rectLastClientWindowTmp.bottom\
- rectDlgItem.bottom;\
static float fDefaultBottomRatio_##CtrlId = (float)rectDlgItem.bottom\
/ rectLastClientWindowTmp.bottom;\
static int nDefaultCtrlHeight_##CtrlId = rectDlgItem.bottom - rectDlgItem.top;\
int nYChangeMode = (TopChangeMode << 8) + BottomChangeMode;\
\
if (0x0000 == nXChangeMode)\
{\
rectDlgItem.right = cx - nDefaultRightPadding_##CtrlId;\
}\
else if (0x0001 == nXChangeMode)\
{\
rectDlgItem.right = fDefaultRightRatio_##CtrlId * cx;\
}\
else if (0x0002 == nXChangeMode)\
{\
/*这里不用更改*/\
}\
else if (0x0100 == nXChangeMode)\
{\
rectDlgItem.left = fDefaultLeftRatio_##CtrlId * cx;\
rectDlgItem.right = cx - nDefaultRightPadding_##CtrlId;\
}\
else if (0x0101 == nXChangeMode)\
{\
rectDlgItem.left = fDefaultLeftRatio_##CtrlId * cx;\
rectDlgItem.right = fDefaultRightRatio_##CtrlId * cx;\
}\
else if (0x0102 == nXChangeMode)\
{\
rectDlgItem.left = fDefaultLeftRatio_##CtrlId * cx;\
rectDlgItem.right = rectDlgItem.left + nDefaultCtrlWidth_##CtrlId;\
}\
else if (0x0200 == nXChangeMode)\
{\
rectDlgItem.right = cx - nDefaultRightPadding_##CtrlId;\
rectDlgItem.left = rectDlgItem.right - nDefaultCtrlWidth_##CtrlId;\
}\
else if (0x0201 == nXChangeMode)\
{\
rectDlgItem.right = fDefaultRightRatio_##CtrlId * cx;\
rectDlgItem.left = rectDlgItem.right - nDefaultCtrlWidth_##CtrlId;\
}\
else if (0x0202 == nXChangeMode)\
{\
/*这里不用更改*/\
}\
\
\
if (0x0000 == nYChangeMode)\
{\
rectDlgItem.bottom = cy - nDefaultBottomPadding_##CtrlId;\
}\
else if (0x0001 == nYChangeMode)\
{\
rectDlgItem.bottom = fDefaultBottomRatio_##CtrlId * cy;\
}\
else if (0x0002 == nYChangeMode)\
{\
/*这里不用更改*/\
}\
else if (0x0100 == nYChangeMode)\
{\
rectDlgItem.top = fDefaultTopRatio_##CtrlId * cy;\
rectDlgItem.bottom = cy - nDefaultBottomPadding_##CtrlId;\
}\
else if (0x0101 == nYChangeMode)\
{\
rectDlgItem.top = fDefaultTopRatio_##CtrlId * cy;\
rectDlgItem.bottom = fDefaultBottomRatio_##CtrlId * cy;\
}\
else if (0x0102 == nYChangeMode)\
{\
rectDlgItem.top = fDefaultTopRatio_##CtrlId * cy;\
rectDlgItem.bottom = rectDlgItem.top + nDefaultCtrlHeight_##CtrlId;\
}\
else if (0x0200 == nYChangeMode)\
{\
rectDlgItem.bottom = cy - nDefaultBottomPadding_##CtrlId;\
rectDlgItem.top = rectDlgItem.bottom - nDefaultCtrlHeight_##CtrlId;\
}\
else if (0x0201 == nYChangeMode)\
{\
rectDlgItem.bottom = fDefaultBottomRatio_##CtrlId * cy;\
rectDlgItem.top = rectDlgItem.bottom - nDefaultCtrlHeight_##CtrlId;\
}\
else if (0x0202 == nYChangeMode)\
{\
/*这里不用更改*/\
}\
pWndDlgItem->MoveWindow(rectDlgItem);\
}\
}
#endif
使用时，只需在对话框的WM_SIZE消息处理函数中加上“AUTO_SET_CONTROL_POS(CtrlId, LeftChangeMode, RightChangeMode, TopChangeMode, BottomChangeMode)”即可，各个参数含义见宏定义的头部注释。对话框大小改变，就会自动修改指定控件的位置和大小。
上图是测试中MFC控件初化的位置，下图为修改控件大小后的布局：
代码中所作的处理如下：
void CDialogApplicationDlg::OnSize(UINT nType, int cx, int cy)
{
CDialog::OnSize(nType, cx, cy);
AUTO_SET_CONTROL_POS( IDC_EDIT1, LEFT_CHANGE_MODE_FIXED_LEFTPADDING,
RIGHT_CHANGE_MODE_FIXED_RIGHTPADDING,
TOP_CHANGE_MODE_FIXED_TOPPADDING,
BOTTOM_CHANGE_MODE_FIXED_HEIGHT);
AUTO_SET_CONTROL_POS(IDC_RICHEDIT1, LEFT_CHANGE_MODE_FIXED_LEFTPADDING,
RIGHT_CHANGE_MODE_FIXED_RIGHTPADDING,
TOP_CHANGE_MODE_FIXED_TOPPADDING,
BOTTOM_CHANGE_MODE_FIXED_LEFEPADDING);
AUTO_SET_CONTROL_POS( IDOK, LEFT_CHANGE_MODE_FIXED_WIDTH,
RIGHT_CHANGE_MODE_FIXED_RIGHTPADDING,
TOP_CHANGE_MODE_FIXED_TOPPADDING,
BOTTOM_CHANGE_MODE_FIXED_HEIGHT);
AUTO_SET_CONTROL_POS( IDCANCEL, LEFT_CHANGE_MODE_FIXED_WIDTH,
RIGHT_CHANGE_MODE_FIXED_RIGHTPADDING,
TOP_CHANGE_MODE_FIXED_TOPPADDING,
BOTTOM_CHANGE_MODE_FIXED_HEIGHT);
AUTO_SET_CONTROL_POS( IDC_STATIC, LEFT_CHANGE_MODE_FIXED_LEFTPADDING,
RIGHT_CHANGE_MODE_FIXED_WIDTH,
TOP_CHANGE_MODE_FIXED_HEIGHT,
BOTTOM_CHANGE_MODE_FIXED_LEFEPADDING);
AUTO_SET_CONTROL_POS( IDC_BUTTON1, LEFT_CHANGE_MODE_FIXED_WIDTH,
RIGHT_CHANGE_MODE_FIXED_RIGHTPADDING,
TOP_CHANGE_MODE_FIXED_HEIGHT,
BOTTOM_CHANGE_MODE_FIXED_LEFEPADDING);
}
每个控件调用一次AUTO_SET_CONTROL_POS，各个参数以宏的形式提供，非常容易了解，比起手写代码非常清晰。当然，如果想重新设计各个控件的布局，只需重新指定布局参数即可。
还好，能看懂。
