单击右键弹出菜单-qunjxxg-ChinaUnix博客

0397 单击右键弹出菜单

在应用程序中单击右键弹出菜单可以方便用户的操作，要实现右键弹出菜单需要调用CMenu类的TrackPopupMenu方法，该方法用于显示一个弹出式菜单。如图6.38所示。

程序代码如下：

void CPopupMenuDlg::OnRButtonUp(UINT nFlags, CPoint point)

{

CMenu* pPopup = m_Menu.GetSubMenu(0);

CRect rc;

ClientToScreen(&point);

rc.top = point.x;

rc.left = point.y;

pPopup->TrackPopupMenu(TPM_LEFTALIGN | TPM_LEFTBUTTON | TPM_VERTICAL,

rc.top,rc.left,this,&rc);

CDialog::OnRButtonUp(nFlags, point);

}

单击右键弹出菜单 - Young - 任我遨游

图6.38 单击右键弹出菜单

0398 可以下拉的菜单

在使用Word等程序时，会发现一些不常用的菜单都被隐藏了，取而代之的是一个下箭头“︾”，单击这个菜单项后会显示出那些被隐藏的菜单。通过DeleteMenu方法和InsertMenu方法来动态删除和添加菜单，从而实现这个功能。如图6.39和图6.40所示。

单击右键弹出菜单 - Young - 任我遨游

图6.39 初始时显示菜单图6.40 下拉后的菜单

程序代码如下：

void CDownMenuDlg::OnMenudown()

{

CMenu* m_pMenu;

m_pMenu = m_Menu.GetSubMenu(0);

m_pMenu->DeleteMenu(3,MF_BYPOSITION);

m_pMenu->InsertMenu(3,MF_BYPOSITION,10001,"复制");

m_pMenu->InsertMenu(4,MF_BYPOSITION,10002,"粘贴");

m_pMenu->InsertMenu(5,MF_BYPOSITION,10003,"打印");

SetMenu(&m_Menu);

}

0399 任务栏托盘弹出菜单

要设计任务栏托盘菜单，需要使用Shell_NotifyIcon函数和NOTIFYICONDATA结构来实现。如图6.41所示。

单击右键弹出菜单 - Young - 任我遨游

图6.41 任务栏托盘弹出菜单

程序代码如下：

BOOL CSysSalverDlg::OnInitDialog()

{

…… //此处代码省略

m_Menu.LoadMenu(IDR_MENU1);

//添加系统托盘

char lpszTip[]="明日科技";

NOTIFYICONDATA data;

data.cbSize=sizeof(NOTIFYICONDATA);

data.hWnd=m_hWnd;

lstrcpyn(data.szTip,lpszTip,sizeof(lpszTip));

data.uCallbackMessage=WM_ONTRAY;

data.uFlags=NIF_MESSAGE|NIF_ICON|NIF_TIP;

data.hIcon=m_hIcon;

data.uID=IDR_MAINFRAME;

Shell_NotifyIcon(NIM_ADD,&data);

return TRUE;

}

void CSysSalverDlg::OnTray(WPARAM wParam, LPARAM lParam)

{

UINT uMouseMsg=(UINT) lParam;

if(uMouseMsg==WM_RBUTTONDOWN)

{

CMenu* pPopup = m_Menu.GetSubMenu(0);

CPoint point;

GetCursorPos(&point);

pPopup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON | TPM_VERTICAL,

point.x,point.y,AfxGetApp()->m_pMainWnd,TPM_LEFTALIGN);

}

void CSysSalverDlg::OnMenuexit()

{

if(MessageBox("确定要退出吗？","系统提示",MB_OKCANCEL|MB_ICONQUESTION)!=1)

return;

CDialog::OnCancel();

}

void CSysSalverDlg::OnDestroy()

{

CDialog::OnDestroy();

NOTIFYICONDATA data;

data.hWnd=m_hWnd;

data.uID=IDR_MAINFRAME;

Shell_NotifyIcon(NIM_DELETE,&data);

}

0400 绘制渐变效果的菜单

如今的许多应用软件都具有漂亮的菜单。在Visual C++中，如何设计这些菜单呢？本例中设计了一个渐变效果的菜单，效果如图6.42所示。

单击右键弹出菜单 - Young - 任我遨游

图6.42 绘制渐变效果的菜单

实现菜单的绘制，需要改写CMenu类的DrawItem方法和MeasureItem方法，在DrawItem方法中根据菜单项的当前状态绘制菜单，在MeasureItem方法中根据菜单项的文本设置菜单项的大小。程序主要代码如下：

//菜单类的声明

struct CMenuItemInfo

{

CString m_ItemText; //菜单项文本

int m_ItemID; //菜单标记 -2顶层菜单,-1弹出式菜单,0分隔条,其他普通菜单

};

class CMyMenu : public CMenu

{

public:

CMyMenu();

virtual ~CMyMenu();

CMenuItemInfo m_ItemLists[MAX_MENUCOUNT]; //菜单项信息

int m_index; //临时索引

int m_iconindex; //菜单项图标索引

BOOL ChangeMenuItem(CMenu* m_menu,BOOL m_Toped = FALSE);

BOOL AttatchMenu(UINT m_uID);

void DrawItemText(CDC* m_pdc,LPSTR str,CRect m_rect);

void DrawTopMenu(CDC* m_pdc,CRect m_rect,BOOL m_selected = FALSE); //绘制顶层菜单

void DrawSeparater(CDC* m_pdc,CRect m_rect);//绘制分隔条

void DrawComMenu(CDC* m_pdc,CRect m_rect,COLORREF m_fromcolor,COLORREF m_tocolor, BOOL m_selected = FALSE);

//override memu's virtual method

virtual void MeasureItem( LPMEASUREITEMSTRUCT lpStruct ); //设置菜单项大小

virtual void DrawItem( LPDRAWITEMSTRUCT lpStruct ); //重绘菜单项

};

//菜单类的实现

CMyMenu::CMyMenu()

{

m_index= 0;

}

CMyMenu::~CMyMenu()

{

}

BOOL CMyMenu::AttatchMenu(UINT m_uID)

{

this->LoadMenu(m_uID);

return TRUE;

}

BOOL CMyMenu::ChangeMenuItem(CMenu* m_menu,BOOL m_Toped)

{

if (m_menu != NULL)

{

int m_itemcount = m_menu->GetMenuItemCount();

for (int i=0;i< P>

{

m_menu->GetMenuString(i,m_ItemLists[m_index].m_ItemText,MF_BYPOSITION);

int m_itemID = m_menu->GetMenuItemID(i);

if (m_itemID==-1 && m_Toped)

{

m_itemID = -2;//顶层菜单

};

m_ItemLists[m_index].m_ItemID = m_itemID;

m_menu->ModifyMenu(i,MF_OWNERDRAW|MF_BYPOSITION |MF_STRING,m_ItemLists[m_index].m_ItemID,(LPSTR)&(m_ItemLists[m_index]));

m_index+=1;

CMenu* m_subMenu = m_menu->GetSubMenu(i);

if (m_subMenu)

{

ChangeMenuItem(m_subMenu);

}

return TRUE ;

}

void CMyMenu::MeasureItem( LPMEASUREITEMSTRUCT lpStruct )

{

if (lpStruct->CtlType==ODT_MENU)

{

lpStruct->itemHeight = ITEMHEIGHT;

lpStruct->itemWidth = ITEMWIDTH;

CMenuItemInfo* m_iteminfo;

m_iteminfo = (CMenuItemInfo*)lpStruct->itemData;

lpStruct->itemWidth =

((CMenuItemInfo*)lpStruct->itemData)->m_ItemText.GetLength()*10;

switch(m_iteminfo->m_ItemID)

{

case 0: //分隔条

{

lpStruct->itemHeight = 1;

break;

}

void CMyMenu::DrawItem( LPDRAWITEMSTRUCT lpStruct )

{

if (lpStruct->CtlType==ODT_MENU)

{

if(lpStruct->itemData == NULL) return;

unsigned int m_state = lpStruct->itemState;

CDC* m_dc = CDC::FromHandle(lpStruct->hDC);

CString str = ((CMenuItemInfo*)(lpStruct->itemData))->m_ItemText;

LPSTR m_str = str.GetBuffer(str.GetLength());

int m_itemID = ((CMenuItemInfo*)(lpStruct->itemData))->m_ItemID;

CRect m_rect = lpStruct->rcItem;

m_dc->SetBkMode(TRANSPARENT);

switch(m_itemID)

{

case -2:

{

DrawTopMenu(m_dc,m_rect,(m_state&ODS_SELECTED)||(m_state&0x0040)); //0x0040 ==ODS_HOTLIGHT

DrawItemText(m_dc,m_str,m_rect);

break;

}

case -1:

{

DrawItemText(m_dc,m_str,m_rect);

break;

}

case 0:

{

DrawSeparater(m_dc,m_rect);

break;

}

default:

{

DrawComMenu(m_dc,m_rect,0xfaa0,0xf00ff,m_state&ODS_SELECTED);

DrawItemText(m_dc,m_str,m_rect);

break;

}

void CMyMenu::DrawItemText(CDC* m_pdc,LPSTR str,CRect m_rect)

{

m_rect.DeflateRect(20,0);

m_pdc->DrawText(str,m_rect,DT_SINGLELINE|DT_VCENTER|DT_LEFT);

}

void CMyMenu::DrawTopMenu(CDC* m_pdc,CRect m_rect,BOOL m_selected )

{

if (m_selected)

{

m_pdc->SelectStockObject(BLACK_PEN);

m_pdc->Rectangle(&m_rect);

m_rect.DeflateRect(1,1);

m_pdc->FillSolidRect(m_rect,RGB(150, 185, 255));

}

else

{

CRect rect;

AfxGetMainWnd()->GetClientRect(rect);

rect.top = m_rect.top;

rect.bottom = m_rect.bottom;

rect.left= 350;

rect.right +=4;

m_pdc->FillSolidRect(&rect,RGB(192,192, 192));

m_pdc->FillSolidRect(&m_rect,RGB(192,192, 192));

}

void CMyMenu::DrawSeparater(CDC* m_pdc,CRect m_rect)

{

if (m_pdc != NULL)

{

m_pdc->Draw3dRect(m_rect,RGB(255,0,0),RGB(0,0,255));

}

void CMyMenu::DrawComMenu(CDC* m_pdc,CRect m_rect,COLORREF m_fromcolor,COLORREF m_tocolor, BOOL m_selected )

{

if (m_selected)

{

m_pdc->Rectangle(m_rect);

m_rect.DeflateRect(1,1);

int r1,g1,b1;

//读取渐变起点的颜色值

r1 = GetRValue(m_fromcolor);

g1 = GetGValue(m_fromcolor);

b1 = GetBValue(m_fromcolor);

int r2,g2,b2;

//读取渐变终点的颜色值

r2 = GetRValue(m_tocolor);

g2 = GetGValue(m_tocolor);

b2 = GetBValue(m_tocolor);

float r3,g3,b3;

r3 = ((float)(r2-r1)) / (float)(m_rect.Height());

g3 = (float)(g2-g1)/(float)(m_rect.Height());

b3 = (float)(b2-b1)/(float)(m_rect.Height());

COLORREF r,g,b;

CPen* m_oldpen ;

for (int i = m_rect.top;i< P>

{

r = r1+(int)r3*(i-m_rect.top);

g = g1+(int)g3*(i-m_rect.top);

b = b1+ (int)b3*(i-m_rect.top);

CPen m_pen (PS_SOLID,1,RGB(r,g,b));

m_oldpen = m_pdc->SelectObject(&m_pen);

m_pdc->MoveTo(m_rect.left,i);

m_pdc->LineTo(m_rect.right,i);

}

m_pdc->SelectObject(m_oldpen);

}

else

{

m_pdc->FillSolidRect(m_rect,RGB(0x000000F9, 0x000000F8, 0x000000F7));

}

单击右键弹出菜单 - Young - 任我遨游 0401 将菜单项的字体设置为粗体

在设计应用程序时，有时需要修改菜单项的字体。在程序中可以使用SystemParametersInfo函数来设置菜单项的字体信息。该函数语法如下：

BOOL SystemParametersInfo(UINT uiAction, UINT uiParam,PVOID pvParam,UINT fWinIni );

参数说明如下。

l uiAction：表示函数执行的动作，如果为SPI_SETNONCLIENTMETRICS，表示这种窗口非客户区域的信息。

l uiParam：该参数的含义依赖于uiAction参数。

l pvParam：表示设置的参数信息。

l fWinIni：表示是否更新用户窗口。

程序主要代码如下：

//获取

NONCLIENTMETRICS info;

info.cbSize =sizeof(NONCLIENTMETRICS);

SystemParametersInfo(SPI_GETNONCLIENTMETRICS,sizeof(NONCLIENTMETRICS),&info,0);

info.lfMenuFont.lfWeight = 700;

SystemParametersInfo(SPI_SETNONCLIENTMETRICS,sizeof(NONCLIENTMETRICS),

&info,SPIF_SENDCHANGE);