Texas Instruments TI89 Developer Guide - Page 154

112 Chapter 11: Creating the User Interface bottom coordinate of the dialog box. They are defined assuming a virtual scroll region. Note: If you use SCROLL_REGION, it must be the first item defined in the dialog box. 11.4.2.10. TEXT char * TextPtr A TEXT field is a static field that allows for stand-alone text to be placed anywhere in a dialog box. The field is defined by a zero-terminated string. If the DF_OWNER_DRAW flag is set, then the call-back is passed the field index and a pointer to a OWNER_DRAW_STRUCT structure. The first item of this structure is a direct pointer to the DIALOG_ITEMS structure for the field to be drawn (this is not normally used). The second item is a pointer to the WINDOW structure for the dialog box. Using this pointer, the call-back can draw anything and anywhere to the dialog box (all clipped to the dialog boxes window). This may include both text and images. typedef struct { DIALOG_ITEMS *Item; WINDOW *pW; } OWNER_DRAW_STRUCT; An example from the VAR-LINK code's receive variable overwrite dialog box is listed below. /* VAR-LINK RECEIVE: Overwrite callback */ WORD VL_OverwriteCB( WORD DlgId, DWORD dValue ) { if (DlgId == 0) { WinStrXY( ((OWNER_DRAW_STRUCT *) dValue)->pW, 8, 15, (char *) VL_VarName ); return TRUE; } if (DlgId == DB_QACTIVE && dValue == 2) return (VL_OverwriteAns[0] == VLO_NO); if (DlgId == 1) return DB_REDRAW_AND_CONTINUE; return TRUE; } 11.4.2.11. XFLAGS WORD xFlags1, xFlags2, xFlags3, xFlags4 The XFLAGS field defines an array of four extended WORD flags. Currently only the first WORD is used and may contain the following flags. The remaining three WORDs should always be set to zero for future compatibility. TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001