/************************************************************************* * MODULE : Btn - Class Body * * AUTHOR : Ron Chernich * * PURPOSE: Class actions used to build "button" like objects used in * * RCOS system. These actions support button construction and * * activation only. All visual aspects are handled by a class * * based on this class. * * HISTORY: * * 18-JAN-93 First (MSC/C++ 7.00) version * * 04-JUN-93 Allocation of button label made conditional * * 29-MAR-94 Button class being deleted twice (allow to DblList do it) * *************************************************************************/ #include "btn.hpp" ///////////////// // table used to lookup the raw key values returned by ALT keys // static unsigned char RawKey[] = { ALT_A, ALT_B, ALT_C, ALT_D, ALT_E, ALT_F, ALT_G, ALT_H, ALT_I, ALT_J, ALT_K, ALT_L, ALT_M, ALT_N, ALT_O, ALT_P, ALT_Q, ALT_R, ALT_S, ALT_T, ALT_U, ALT_V, ALT_W, ALT_X, ALT_Y, ALT_Z, ALT_0, ALT_1, ALT_2, ALT_3, ALT_4, ALT_5, ALT_6, ALT_7, ALT_8, ALT_9 }; ////////////////////////////////////////////////////////////////////////// // Class destructor: Kills off all buttons in a linked list, // and then the list itself // Btn::~Btn() { pb = (btn*)DblGetHead(); while (pb) { if (pb->pst) delete pb->pst; pb = (btn*)DblGetNext(); } DblDrop(); pb = NULL; }; ///////////////// // Add a new button to the linked list. The params decode as: // n .. the ID to be returned when the button is activated // str .. Button label (with optional hot key char prefixed by "&") // x1,y1 .. Upper-Left boundary for "hot reigon" // x2,y2 .. width and height of hot area from upper-left reference // RETURNS: TRUE .. action complete (Btn::pb references new data object) // FALSE .. unable to allocate storage for item // BOOL Btn::BtnNew(const UINT16 n, char *str, rect &r) { btn *p; int idx; char *cp; BOOL bOk = FALSE; if (p = new btn) { p->r = r; p->Id = n; p->status = 0; if (strlen(str) == 0) p->pst = NULL; else { p->pst = new Str(str); if (cp = strchr(str, '&')) { ++cp; idx = (((*cp >= 'a') && (*cp ((*cp >= 'A') && (*cp ((*cp >= '0') && (*cp p->HotKey = ((idx >= 0) ? RawKey[idx] : 0); } } if (DblAppend((void*)p, (UINT16)sizeof(btn))) bOk = TRUE; else delete p->pst; } if (pb = p) // bit naughty: combined assignment and test (not comparison!) delete p; return bOk; } /////////////// // See if a member button has the passed Hot Key code // RETURNS: button reference (or NULL if Hot Key unsegistered) // btn *Btn::BtnHit (const char ch) { pb = (btn*)DblGetHead(); while (pb) { if (ch == pb->HotKey) break; pb = (btn*)DblGetNext(); } return pb; } /////////////// // See if the passed point lies in a member button Hot Zone // RETURNS: button reference (or NULL if point unsegistered) // btn *Btn::BtnHit (point &pt) { pb = (btn*)DblGetHead(); while (pb) { if (pb->r.InRect(pt)) break; pb = (btn*)DblGetNext(); } return pb; } ///////////// // Locate button by ID // RETURNS: TRUE .. ID found, pb -> data // FALSE .. unknown ID // BOOL Btn::BtnFind (const UINT16 id) { pb = (btn*)DblGetHead(); while (pb) { if (pb->Id == id) return TRUE; pb = (btn*)DblGetNext(); } return FALSE; } ///////////// // Delete string label of button with passed ID from list, then allow // the linked list class to free the rest. If the passed ID is ZERO // (an illegal ID), kill off all controls in the list. // void Btn::BtnKill (const UINT16 nTarg) { pb = (btn*)DblGetHead(); while (pb) { if (!nTarg || (pb->Id == nTarg)) { if (pb->pst) delete pb->pst; DblDelete(); break; } pb = (btn*)DblGetNext(); } } /************************************ EOF ********************************/
