走進windows編程的世界-----訊息處理函數（4）

標籤：右鍵菜單

一 右鍵菜單
  1 右鍵菜單
    當在視窗點擊滑鼠右鍵時，彈出的菜單。
  2 右鍵菜單的使用
    2.1 建立菜單
      CreatePopupMenu
    2.2 菜單增加
     AppendMenu
    2.3 菜單的顯示、

BOOL TrackPopupMenu(    HMENU hMenu, //顯示的菜單控制代碼    UINT uFlags, //顯示的方式  int x, //菜單的X螢幕座標  int y, //菜單的Y螢幕座標  int nReserved, //保留,必須為0  HWND hWnd, //處理功能表命令的視窗控制代碼  CONST RECT *prcRect ); //忽略

    2.4 菜單的命令處理

     WM_COMMAND 
    2.5 使用右鍵菜單的位置
      2.5.1 WM_RBUTTONUP 訊息
        在WM_RBUTTONUP中,添加菜單的建立及顯示,
        右鍵訊息座標,轉換成螢幕座標使用.
          ClientToScreen.
      2.5.2 WM_CONTEXTMENU 訊息
        用於顯示右鍵的菜單的訊息.
          WPARAM - 右鍵抬起時對應視窗控制代碼
          LPARAM - 右鍵抬起時滑鼠的螢幕座標位置
             LOWORD(lParam) - X螢幕座標
             HIWORD(lParam) - Y螢幕座標
      2.5.3 WM_RBUTTONUP和WM_CONTEXTMENU對比
        1) 座標系不同, WM_RBUTTONUP客戶區座標,WM_CONTEXTMENU螢幕座標
        2) 先有WM_RBUTTONUP訊息,後有WM_CONTEXTMENU訊息

 

/* File : winPopMenu.cpp   * Auth : sjin   * Date : 20140706   * Mail : [email protected]   */        #include <Windows.h>    #include <stdio.h>HINSTANCE g_hInst = NULL;void OnRButtonUp( HWND hWnd, UINT nMsg,         WPARAM wParam, LPARAM lParam ){    // 建立彈出式菜單    HMENU hPopMenu = CreatePopupMenu( );    // 增加功能表項目    AppendMenu( hPopMenu, MF_STRING, 1001, "測試1");    AppendMenu( hPopMenu, MF_SEPARATOR, 0, NULL );    AppendMenu( hPopMenu, MF_STRING, 1002, "退出");    // 擷取菜單位置    POINT point = { 0 };    point.x = LOWORD( lParam );    point.y = HIWORD( lParam );    ClientToScreen( hWnd, &point );    // 顯示菜單    TrackPopupMenu( hPopMenu, TPM_LEFTALIGN,        point.x, point.y, 0, hWnd, NULL );}void OnContextMenu( HWND hWnd, UINT nMsg,     WPARAM wParam, LPARAM lParam ){   // 建立彈出式菜單    HMENU hPopMenu = CreatePopupMenu( );    // 增加功能表項目    AppendMenu( hPopMenu, MF_STRING, 1001, "測試2");    AppendMenu( hPopMenu, MF_SEPARATOR, 0, NULL );    AppendMenu( hPopMenu, MF_STRING, 1002, "退出");    // 座標擷取    int nX = LOWORD( lParam );    int nY = HIWORD( lParam );    // 顯示菜單    TrackPopupMenu( hPopMenu, TPM_LEFTALIGN,        nX, nY, 0, hWnd, NULL );    // 刪除菜單    DestroyMenu( hPopMenu );}void OnCommand( HWND hWnd, UINT nMsg,         WPARAM wParam, LPARAM lParam ){    int nCmdID = LOWORD( wParam );    switch( nCmdID )    {    case 1001:        MessageBox( NULL, "Hello Popmenu",            "PopMenu", MB_OK );        break;    case 1002:        PostQuitMessage( 0 );        break;    }}LRESULT CALLBACK WndProc( HWND   hWnd,                           UINT   nMsg,                          WPARAM wParam,                          LPARAM lParam ){    switch( nMsg )    {    case WM_RBUTTONUP:        //OnRButtonUp( hWnd, nMsg, wParam, lParam );        break;    case WM_CONTEXTMENU:        OnContextMenu( hWnd, nMsg, wParam, lParam );        break;    case WM_COMMAND:        OnCommand( hWnd, nMsg, wParam, lParam );        break;    case WM_DESTROY:        PostQuitMessage( 0 );        return 0;    }    return DefWindowProc( hWnd, nMsg,        wParam, lParam );}BOOL RegisterWnd( LPSTR pszClassName ){    WNDCLASSEX wce = { 0 };    wce.cbSize        = sizeof( wce );    wce.cbClsExtra    = 0;    wce.cbWndExtra    = 0;    wce.hbrBackground = HBRUSH(COLOR_WINDOW);    wce.hCursor       = NULL;    wce.hIcon         = NULL;    wce.hIconSm       = NULL;    wce.hInstance     = g_hInst;    wce.lpfnWndProc   = WndProc;    wce.lpszClassName = pszClassName;    wce.lpszMenuName  = NULL;    wce.style         = CS_HREDRAW|CS_VREDRAW;    ATOM nAtom = RegisterClassEx( &wce );    if( 0 ==  nAtom )    {        return FALSE;    }    return TRUE;}HWND CreateWnd( LPSTR pszClassName ){    HWND hWnd = CreateWindowEx( 0,        pszClassName, "MyWnd",         WS_OVERLAPPEDWINDOW, CW_USEDEFAULT,        CW_USEDEFAULT, CW_USEDEFAULT,        CW_USEDEFAULT, NULL, NULL, g_hInst,        NULL );    return hWnd;}void DisplayWnd( HWND hWnd ){    ShowWindow( hWnd, SW_SHOW );    UpdateWindow( hWnd );}void Message( ){    MSG msg = { 0 };    while( GetMessage( &msg, NULL, 0, 0 ) )    {        TranslateMessage( &msg );        DispatchMessage( &msg );    }}int APIENTRY WinMain(HINSTANCE hInstance,                     HINSTANCE hPrevInstance,                     LPSTR     lpCmdLine,                     int       nCmdShow){    g_hInst = hInstance;    RegisterWnd( "MYWND" );    HWND hWnd = CreateWnd( "MYWND" );    DisplayWnd( hWnd );    Message( );    return 0;}