Seven, component
7.1 User Customizing Components
The name of the component named in the standard component is defined as a class type as the "class type" section definition, and the difference is that they have a 3-character indicator prefix, which can represent companies, individuals, or other entities. For example, the name of the clock member written for the Delphi 4 Developer Guide is defined as:
TDDGCLOCK = Class (Tcomponent)
Note that the three prefix characters are lowercase.
7.2 component unit
The component unit should contain only one primary member, and a major component is a component in the component column. The auxiliary member / object of the main component should be placed in the same unit.
7.3 Using registration unit
The registration process of the component should be removed from the unit itself and put it into a separate unit. This registration unit can be used to register any component, attribute editor, component editor, exemption, etc.
The registration of the component should only be carried out in the design clip, and the registration unit should be included in the design time package and should not be placed in the running moment.
The name of the registration unit recommended is:
Xxxreg.pas
The above three prefix characters "XXX" are used to represent a company, a personal or any other entity. For example, the name of the registration unit in the Delphi 4 Developer Guide should be DDGREG.PAS.
7.4 Component instance naming conventions
All components should take a descriptive name. The components of the default name created by Delphi are not abandoned. A lowercase prefix should be designed when the design component type is designed. The reason why the prefix does not use the suffix is when searching, the name of the search component in the Object Check and the Code Explorer is more easily implemented than the type of search member.
7.5 Prefix of the component
The prefix of the following components can be used to design the standard components in Delphi 4. Please join the prefix of a third party component in this list.
7.6 Standard Page
Prefix member
MM TmainMenu
PM TPopupmenu
Mmi TmainMenuItem
PMI TPopupMenuItem
Prefix member
LBL TLABEL
EDT TEDIT
MEM TMEMO
BTN TBUTTON
CB Tcheckbox
RB Tradiobox
LB TListBox
CB TcomboBox
SCB Tscrollbar
GB TGroupBox
RG TradioGroup
PNL TPANEL
CL TcommandList
7.7 Additional Page
BBTN TbitBTN
SB TspeedButton
Me tmaskedit
SG TSTRINGGRID
DG TDRAWGRID
IMG TIMAGE
SHP TSHAPE
BVL TBevel
SBX Tscrollbox
CLB Tchecklistbox
SPL TSPLITTER
StX TSTATICText
CHT TCHART
7.8 Win32 Page
TBC TTABControl
PGC TPAGECONTROL
Il Timagelist
Re TrichEdit
THR TTRACKBAR
PRB TPROGRESSBAR
UD tupdown
HK THOTKEY
Ani tanimate
DTP TDATETIMEPICKER
TV TTREEVIEW
LV TLISTVIEW
HDR THEADERCONTROL
Prefix member
STB TSTATUSBARTLB TTOOLBAR
CLB TCOOLBAR
7.9 SYSTEM Page
TM TTIMER
PB TPaintBox
MP TMEDIAPLAYER
OLEC TOLECONTAINER
DDCC TDDECLIENTITEM
DDCI TDDeclientItem
DDSC TDDeServerConv
DDSI TDDeServerItem
7.10 Internet Page
CSK TclientSocket
SSK TSERVERSOCKET
WBD TWEBDISPATCHER
PP TPAGEPRODUCER
TP TQueryTableProducer
DSTP TDataSetTableProducer
NMDT TNMDAYTIME
NEC TNMecho
NF TNMFinger
NFTP TNMFTP
NHTTP TNMHTP
NMSG TNMMSG
NMSG TNMMSGServ
NNTP TNMNNTP
NPOP TNMPOP3
Nuup TNMUUUPROCESSOR
SMTP TNMSMTP
NST TNMSTRM
NSTS TNMSTRMSERV
NTM TNMTIME
NUDP TNMUDP
PSK TPOWERSOCK
NGS TNMGENERALRERVER
HTML THTML
URL TNMURL
SML TSIMPLEMAIL
7.11 Data Access Page
Prefix member
DS TDataSource
TBL TTABLE
Qry TQuery
SP TSToredProc
DB TDATABASE
SSN TSession
BM TBATCHMOVE
USQL TUPDATESQL
7.12 Data Controls Page
DBG TDBGRID
DBN TDBNAVIGATOR
DBT TDBText
Dbe Tdbedit
DBM TDBMEMO
DBI TDBIMAGE
DBLB TDBListbox
DBCB TDBCOMBOBOX
DBCH TDBCHECKBOX
DBRG TDBRADIOGROUP
DBLL TDBLOOKUPLISTBOX
DBLC TDBLOOKUPCOMBOX
DBRE TDBRICHEDIT
DBCG TDBCTRLGRID
DBCH TDBCHART
7.13 Decision Cube Page
DCB TDecisioncube
DCQ TDecisionQuery
DCS TDECISISOURCE
DCP TDECISIONPIVOT
DCG TDECISIONGRID
Dcgr TDecisiongraph
7.14 QReport Page
QR TQUickReport
QRSD TQRSUBDetail
QRB TQRBAND
Qrcb TQRCHildband
QRG TQRGROUP
Qrl Tqrlabel
Prefix member
QRT TQRTextqre TQREXPR
QRS TQrsysdata
QRM TQRMEMO
Qrrt tqrrichtext
QrDR TQRDBRICHText
QRSH TQRSHAPE
QRI TQRIMAGE
QrDi Tqrdbmimage
Qrcr TqrcompositerEport
Qrp tqrpreview
Qrch TQRCHART
7.15 Dialogs Page
The dialog assembly is a real form packaged by the component, so they should follow the form of naming conventions. The type has been defined by the name of the component. The name of its instance is the type instance name that Delphi automatically generated removes the digital suffix. For example, as follows:
Type instance name
TopEndialog OpenDialog
TsaveDialog Savedialog
TopenPictureDialog OpenPictureDialog
TsavePictureDialog SavePictureDialog
TFONTDIALOG FONTDIALOGOGOG
TcolorDialog Colordialog
TPrintSetupDialog PrintSetupDialog
TfindDialog FindDialog
TreplaceDialog ReplaceDialog
7.16 Win3.1 Page
DBLL TDBLOOKUPLIST
DBLC TDBLOOKUPCOMBO
TS TTABSET
Ol Toutline
TNB TTABBEDNOTEBOOK
NB TNOTEBOOK
HDR THEADER
FLB TFileListbox
DLB TDIRECTORYLISTBOX
DCB TDRIVECOMBOBOX
FCB TFliterComboBox
7.17 Samples Page
GG TGAUGE
Prefix member
CG Tcolorgrid
SPB TSPINEDIT
SPE TSPINEDIT
DOL TDIRECTORYOUTLINE
Cal Tcalendar
Ibea Tibeventalerter
7.18 ActiveX Page
CFX TCHARTFX
VSP TVSSPELL
F1b TF1BOOK
VTC TVTCHART
GRP TGRAPH
7.19 Midas Page
PRV TPROVIDER
CDS TclientDataSet
QCDS TQueryClientDataSet
DCOM TDCOMCONNECTION
Olee toleEnterpriseConnection
SCK TSOCKETCONNECONNECTION
RMS TREMOTSERVER
Mid TmidasConnection
