你是否遇到过这样的问题：用编译器拖出一些控件放到对话框上，并合理安排好了位置；但编译运行，改变对话框的大小后，所有控件的位置都乱了，让人感觉非常糟糕。如果控件不太多，你可以尝试手写代码定位每个控件的位置，但若是控件数量以十或百为单位计数甚至更多，逐一为每个控件指定位置就非常麻烦了。
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。