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);
}
