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Annotation of mstools/samples/console/cursor.c, revision 1.1.1.1

1.1       root        1: #include <windows.h>
                      2: #include <stdio.h>
                      3: #include "console.h"
                      4: 
                      5: /*********************************************************************
                      6: * FUNCTION: demoCursor(HANDLE hConOut)                               *
                      7: *                                                                    *
                      8: * PURPOSE: demonstrate GetConsoleCursorInfo, SetConsoleCursorInfo,   *
                      9: *          and SetConsoleCursorPosition. Show the current cursor     *
                     10: *          information, then have the cursor follow the mouse around *
                     11: *          the screen. Shrink the cursor size when the user clicks   *
                     12: *          one button, and grow the cursor when he clicks the other. *
                     13: *                                                                    *
                     14: * INPUT: the console output handle to write to and manipulate the    *
                     15: *        cursor for.                                                 *
                     16: *********************************************************************/
                     17: 
                     18: void demoCursor(HANDLE hConOut)
                     19: {
                     20:   BOOL bSuccess;
                     21:   /* to set initial size and visibility of cursor */
                     22:   CONSOLE_CURSOR_INFO cci;
                     23:   INPUT_RECORD inputBuffer;
                     24:   DWORD dwInputEvents;
                     25:   HANDLE hStdIn;
                     26:   CHAR szTemp[128];
                     27: 
                     28:   setConTitle(__FILE__);
                     29:   myPuts(hConOut, "Current cursor information, as reported by\n"
                     30:                   "GetConsoleCursorInfo:\n");
                     31:   bSuccess = GetConsoleCursorInfo(hConOut, &cci);
                     32:   PERR(bSuccess, "GetConsoleCursorInfo");
                     33:   sprintf(szTemp, "Cursor size (in percent maximum): %d", cci.dwSize);
                     34:   myPuts(hConOut, szTemp);
                     35:   sprintf(szTemp, "Cursor visible: %s", cci.bVisible ? "TRUE" : "FALSE");
                     36:   myPuts(hConOut, szTemp);
                     37:   myPuts(hConOut, "\nLet's use SetConsoleCursorPosition to have the console\n"
                     38:                   "cursor follow the mouse pointer around on the screen.\n"
                     39:                   "When the left mouse button is clicked, we'll use \n"
                     40:                   "SetConsoleCursorInfo to increase the cursor size by 10%.\n"
                     41:                   "When the right mouse button is clicked, the cursor size\n"
                     42:                   "will be decreased by 10%. To return, hit ESC.");
                     43:   hStdIn = GetStdHandle(STD_INPUT_HANDLE);
                     44:   for(;;)
                     45:     {
                     46:       /* get an input event */
                     47:     bSuccess = ReadConsoleInput(hStdIn, &inputBuffer, 1, &dwInputEvents);
                     48:     PERR(bSuccess, "ReadConsoleInput");
                     49:     switch (inputBuffer.EventType)
                     50:       {
                     51:       case KEY_EVENT:
                     52:         /* is it a key-down event? Is it an ESC char? If so return */
                     53:         if (inputBuffer.Event.KeyEvent.bKeyDown &&
                     54:             inputBuffer.Event.KeyEvent.wVirtualKeyCode == VK_ESCAPE)
                     55:           return;
                     56:         break;
                     57:       case MOUSE_EVENT:
                     58:         /* if the mouse moved draw the cursor at the mouse position */
                     59:         if (inputBuffer.Event.MouseEvent.dwEventFlags == MOUSE_MOVED)
                     60:           {
                     61:           bSuccess = SetConsoleCursorPosition(hConOut,
                     62:               inputBuffer.Event.MouseEvent.dwMousePosition);
                     63:           PERR(bSuccess, "SetConsoleCursorPosition");
                     64:           }
                     65:         /* if the mouse is clicked, increase/decrease cursor size. */
                     66:         /* Consider a double click a single click for this sample */
                     67:         if (!inputBuffer.Event.MouseEvent.dwEventFlags || /* a click */
                     68:             inputBuffer.Event.MouseEvent.dwEventFlags == DOUBLE_CLICK)
                     69:           {
                     70:           /* is the leftmost mouse button is down? If so, increase cursor */
                     71:           if (inputBuffer.Event.MouseEvent.dwButtonState ==
                     72:               FROM_LEFT_1ST_BUTTON_PRESSED)
                     73:             {
                     74:             /* if cursor size grows > 100, wrap around to small size */
                     75:             cci.dwSize = (cci.dwSize + 10) % 100 + 1;
                     76:             bSuccess = SetConsoleCursorInfo(hConOut, &cci);
                     77:             PERR(bSuccess, "SetConsoleCursorInfo");
                     78:             }
                     79:           /* is the rightmost button is down? */
                     80:           if (inputBuffer.Event.MouseEvent.dwButtonState ==
                     81:               RIGHTMOST_BUTTON_PRESSED)
                     82:             {
                     83:             /* if cursor size < 0, wrap around to large size */
                     84:             cci.dwSize -= 10;
                     85:             if ((int) cci.dwSize < 1)
                     86:               cci.dwSize = 100;
                     87:             bSuccess = SetConsoleCursorInfo(hConOut, &cci);
                     88:             PERR(bSuccess, "SetConsoleCursorInfo");
                     89:             }
                     90:           /* other buttons will be ignored */
                     91:           }
                     92:         break;
                     93:       } /* switch */
                     94:     }  /* while */
                     95:   return;
                     96: }

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