敬业的IT人 互联网 佚名 2008-1-3 21:54:31

　　我们知道,C++Builder没有自画菜单，但可以调用API函数::SetMenuItemInfo（）来改变菜单类型，达到自画菜单的目的。下面的例子演示了如何使用自画菜单。当鼠标位于菜单上拾，菜单项将凸出来。(黑体字为添加的代码)

//头文件
//------------------------------------------
#ifndef TestMenuH
#define TestMenuH
//-----------------------------------------
#include Classes.hpp
#include Controls.hpp
#include StdCtrls.hpp
#include Forms.hpp
#include Menus.hpp//--------------------
class TForm1 : public TForm
{
__published: // IDE-managed Components
TMainMenu *MainMenu1;
TMenuItem *aaa1;
TMenuItem *aaaaaaaaa1;
TMenuItem *ccc1;
TMenuItem *ddd1;
TMenuItem *eee1;
TMenuItem *ddsds1;
TMenuItem *fcdfsss1;
TMenuItem *dddddddd1;
void __fastcall FormCreate(TObject *Sender);
private: // User declarations
void __fastcall Modify(TMenuItem *pMenuItem);
protected :
MESSAGE void __fastcall CNMeasureItem(TWMMeasureItem Msg);//增加响应消息
MESSAGE void __fastcall CNDrawItem(TWMDrawItem Msg);
public: // User declarations
__fastcall TForm1(TComponent* Owner);
BEGIN_MESSAGE_MAP//添加消息映射
VCL_MESSAGE_HANDLER(WM_MEASUREITEM, TWMMeasureItem, CNMeasureItem);
VCL_MESSAGE_HANDLER( WM_DRAWITEM, TWMDrawItem, CNDrawItem);
END_MESSAGE_MAP(TForm);
};
//---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------------------------------------------
#endif

//实现文件
//---------------------------------------------------------------------------
#include vcl.h
#pragma hdrstop

#include TestMenu.h
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource *.dfm
T m1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Modify(TMenuItem *pMenuItem)
{//修改缺省属性
for(int i=0;ipMenuItem-Count;i++)
{
MENUITEMINFO mii=
{
sizeof(MENUITEMINFO),
MIIM_TYPE|MIIM_DATA ,//改变类型和数据
MF_OWNERDRAW,0,0,0,0,0,DWORD(pMenuItem-Items[i]-Handle),
//把菜单项的句柄赋给32位数据
0,
0,
};
if(pMenuItem-Items[i]-Caption!=-)//如果不是间隔线
::SetMenuItemInfo(pMenuItem-Handle,i,TRUE,mii);
if(pMenuItem-Items[i]-Count)//如果含有子菜单
Modify(pMenuItem-Items[i]);
}

}
void __fastcall TForm1::FormCreate(TObject *Sender)
{
for(int i=0;iMainMenu1-Items-Count;i++)
{
Modify(MainMenu1-Items-Items[i]);
}
DrawMenuBar(Handle);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::CNMeasureItem(TWMMeasureItem Msg)
{//设置菜单大小
TMenuItem *pItem=MainMenu1-FindItem(Msg.MeasureItemStruct-itemData,fkHandle);
Msg.MeasureItemStruct-itemWidth =pItem-Caption.Length()*8+40;
Msg.MeasureItemStruct-itemHeight = 20;
}
void __fastcall TForm1::CNDrawItem(TWMDrawItem Msg)
{//画出菜单
TMenuItem *pItem=MainMenu1-FindItem(Msg.DrawItemStruct-itemData,fkHandle);
TCanvas *pCanvas=new TCanvas;
pCanvas-Handle=Msg.DrawItemStruct-hDC;
RECT r=Msg.DrawItemStruct-rcItem;
pCanvas-Brush-Color=clBtnFace;
RECT r1=r;
r1.right+=1;
r1.bottom+=1;
r1.top-=1;
r1.left-=1;
pCanvas-FillRect(r);
::SetBkMode(pCanvas-Handle,TRANSPARENT);
pCanvas-TextOut(r.left+10,r.top+2,pItem-Caption);
r.right-=1;
r.bottom-=1;
if(Msg.DrawItemStruct-itemAction == ODA_SELECT
Msg.DrawItemStruct-itemStateODS_SELECTED )
{
pCanvas-Pen-Color=(TColor)(RGB(255,255,255));
pCanvas-MoveTo(r.right,r.top);
pCanvas-LineTo(r.left,r.top);
pCanvas-LineTo(r.left,r.bottom);
pCanvas-Pen-Color=(TColor)(RGB(128,128,128));
pCanvas-LineTo(r.right,r.bottom);
pCanvas-LineTo(r.right,r.top);
}
}进入讨论组讨论。

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