MFC界面控件位置大小控制的EasySize使用说明

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第一步：讲EasySize.h头文件拷贝到工程文件夹下面
第二步：在对话框类定义下面添加"DECLARE_EASYSIZE"宏，没有分号，同消息映射类似。
第三步：添加控件布局映射，在该对话实现文件的消息映射下加上：BEGIN_EASYSIZE_MAP(对话框类名)
EASYSIZE(控件ID,left,top,right,bottom,options);
END_EASYSIZE_MAP，该格式类似消息映射的格式
第四步：在对话框的onInitDialog里添加宏："INIT_EASYSIZE;"，该句是有分号的。
第五步：在对话框的OnSize里添加宏："UPDATE_EASYSIZE;"，该句是有分号的。
第六步：如果要限制对话框的最小尺寸，在对话框的OnSizing里添加：EASYSIZE_MINSIZE

(width,height,fwSide,pRect)；
注意：1、第二步和第三步必须对应，不然连接会报错。
2、一般Dialog没有WM_SIZING，在Class Wizard里选择Class Info标签，然后在Message Fileter下拉列表中选

择Windows，然后再点击Message Maps标签，就出现WM_SIZING消息了。
3、control是要设置的控件的ID；left、top、right、bottom分别指的是该控件左、上、右、下方的控件的ID，

也可以为以下特殊值；ES_BORDER：保持与边框距离不变；ES_KEEPSIZE：保持大小不变；options可指定为0，也

可指定为以下值：ES_HCENTER：保持宽度不变，水平位置在left和right指定的控件正中间；ES_VCENTER：保持

高度不变，垂直位置在left和right指定的控件正中间。

EasySize.h文件内容

/*===================================================*\
|                                                     |
| EASY-SIZE Macros                                   |
|                                                     |
| Copyright (c) 2001 - Marc Richarme                 |
|      devix@devix.cjb.net                            |
|      http://devix.cjb.net                           |
|                                                     |
| License:                                           |
|                                                     |
| You may use this code in any commersial or non-    |
| commersial application, and you may redistribute   |
| this file (and even modify it if you wish) as      |
| long as you keep this notice untouched in any      |
| version you redistribute.                          |
|                                                     |
| Usage:                                             |
|                                                     |
| - Insert 'DECLARE_EASYSIZE' somewhere in your      |
|    class declaration                                |
| - Insert an easysize map in the beginning of your |
|    class implementation (see documentation) and     |
|    outside of any function.                         |
| - Insert 'INIT_EASYSIZE;' in your                  |
|    OnInitDialog handler.                            |
| - Insert 'UPDATE_EASYSIZE' in your OnSize handler |
| - Optional: Insert 'EASYSIZE_MINSIZE(mx,my);' in   |
|    your OnSizing handler if you want to specify     |
|    a minimum size for your dialog                   |
|                                                     |
|        Check http://devix.cjb.net for the           |
|              docs and new versions                  |
|                                                     |
\*===================================================*/

#ifndef __EASYSIZE_H_
#define __EASYSIZE_H_
#define ES_BORDER 0xffffffff
#define ES_KEEPSIZE 0xfffffffe
#define ES_HCENTER 0x00000001
#define ES_VCENTER 0x00000002
#define DECLARE_EASYSIZE \
void __ES__RepositionControls(BOOL bInit);\
void __ES__CalcBottomRight(CWnd *pThis, BOOL bBottom, int &bottomright, int &topleft, UINT id, UINT br, int es_br, CRect &rect, int clientbottomright);
#define INIT_EASYSIZE __ES__RepositionControls(TRUE); __ES__RepositionControls(FALSE)
#define UPDATE_EASYSIZE if(GetWindow(GW_CHILD)!=NULL) __ES__RepositionControls(FALSE)
#define EASYSIZE_MINSIZE(mx,my,s,r) if(r->right-r->left < mx) { if((s == WMSZ_BOTTOMLEFT)||(s == WMSZ_LEFT)||(s == WMSZ_TOPLEFT)) r->left = r->right-mx; else r->right = r->left+mx; } if(r->bottom-r->top < my) { if((s == WMSZ_TOP)||(s == WMSZ_TOPLEFT)||(s == WMSZ_TOPRIGHT)) r->top = r->bottom-my; else r->bottom = r->top+my; }
#define BEGIN_EASYSIZE_MAP(class) \
void class::__ES__CalcBottomRight(CWnd *pThis, BOOL bBottom, int &bottomright, int &topleft, UINT id, UINT br, int es_br, CRect &rect, int clientbottomright) {\
if(br==ES_BORDER) bottomright = clientbottomright-es_br;\
else if(br==ES_KEEPSIZE) bottomright = topleft+es_br;\
else { CRect rect2;\
pThis->GetDlgItem(br)->GetWindowRect(rect2); pThis->ScreenToClient(rect2);\
bottomright = (bBottom?rect2.top:rect2.left) - es_br;}}\
void class::__ES__RepositionControls(BOOL bInit) { CRect rect,rect2,client; GetClientRect(client);
#define END_EASYSIZE_MAP Invalidate(); UpdateWindow(); }
#define EASYSIZE(id,l,t,r,b,o) \
static int id##_es_l, id##_es_t, id##_es_r, id##_es_b;\
if(bInit) {\
GetDlgItem(id)->GetWindowRect(rect); ScreenToClient(rect);\
if(o & ES_HCENTER) id##_es_l = rect.Width()/2; else {\
if(l==ES_BORDER) id##_es_l = rect.left; else if(l==ES_KEEPSIZE) id##_es_l = rect.Width(); else {\
   GetDlgItem(l)->GetWindowRect(rect2); ScreenToClient(rect2);\
   id##_es_l = rect.left-rect2.right;}}\
if(o & ES_VCENTER) id##_es_t = rect.Height()/2; else {\
if(t==ES_BORDER) id##_es_t = rect.top; else if(t==ES_KEEPSIZE) id##_es_t = rect.Height(); else {\
   GetDlgItem(t)->GetWindowRect(rect2); ScreenToClient(rect2);\
   id##_es_t = rect.top-rect2.bottom;}}\
if(o & ES_HCENTER) id##_es_r = rect.Width(); else { if(r==ES_BORDER) id##_es_r = client.right-rect.right; else if(r==ES_KEEPSIZE) id##_es_r = rect.Width(); else {\
   GetDlgItem(r)->GetWindowRect(rect2); ScreenToClient(rect2);\
   id##_es_r = rect2.left-rect.right;}}\
if(o & ES_VCENTER) id##_es_b = rect.Height(); else { if(b==ES_BORDER) id##_es_b = client.bottom-rect.bottom; else if(b==ES_KEEPSIZE) id##_es_b = rect.Height(); else {\
   GetDlgItem(b)->GetWindowRect(rect2); ScreenToClient(rect2);\
   id##_es_b = rect2.top-rect.bottom;}}\
} else {\
int left,top,right,bottom; BOOL bR = FALSE,bB = FALSE;\
if(o & ES_HCENTER) { int _a,_b;\
if(l==ES_BORDER) _a = client.left; else { GetDlgItem(l)->GetWindowRect(rect2); ScreenToClient(rect2); _a = rect2.right; }\
if(r==ES_BORDER) _b = client.right; else { GetDlgItem(r)->GetWindowRect(rect2); ScreenToClient(rect2); _b = rect2.left; }\
left = _a+((_b-_a)/2-id##_es_l); right = left + id##_es_r;} else {\
if(l==ES_BORDER) left = id##_es_l;\
else if(l==ES_KEEPSIZE) { __ES__CalcBottomRight(this,FALSE,right,left,id,r,id##_es_r,rect,client.right); left = right-id##_es_l;\
} else { GetDlgItem(l)->GetWindowRect(rect2); ScreenToClient(rect2); left = rect2.right + id##_es_l; }\
if(l != ES_KEEPSIZE) __ES__CalcBottomRight(this,FALSE,right,left,id,r,id##_es_r,rect,client.right);}\
if(o & ES_VCENTER) { int _a,_b;\
if(t==ES_BORDER) _a = client.top; else { GetDlgItem(t)->GetWindowRect(rect2); ScreenToClient(rect2); _a = rect2.bottom; }\
if(b==ES_BORDER) _b = client.bottom; else { GetDlgItem(b)->GetWindowRect(rect2); ScreenToClient(rect2); _b = rect2.top; }\
top = _a+((_b-_a)/2-id##_es_t); bottom = top + id##_es_b;} else {\
if(t==ES_BORDER) top = id##_es_t;\
else if(t==ES_KEEPSIZE) { __ES__CalcBottomRight(this,TRUE,bottom,top,id,b,id##_es_b,rect,client.bottom); top = bottom-id##_es_t;\
} else { GetDlgItem(t)->GetWindowRect(rect2); ScreenToClient(rect2); top = rect2.bottom + id##_es_t; }\
if(t != ES_KEEPSIZE) __ES__CalcBottomRight(this,TRUE,bottom,top,id,b,id##_es_b,rect,client.bottom);}\
GetDlgItem(id)->MoveWindow(left,top,right-left,bottom-top,FALSE);\
}
#endif //__EASYSIZE_H_

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