Lab 4 PaletteSet and Database Events
Trong phng th nghim ny, chng ta s thm mt PaletteSet v thm cc s
kin c s d liu. Trong s kin chng ti s b sung thm d liu v thc th thm
vo cc bn v vi mt iu khin TreeView trong mt paletteSet.M d n Lab3 ca
bn v thm mt UserControl. Ti menu Project v chn "Add User Control".
(Hoc m cc d n Lab4 m c cc UserForm v cc bc cho phng th nghim).
Chp nhn tn mc nh (UserControl1.vb)
Hin th Toolbox (Ctrl + Alt + X) v thm mt iu khin TreeView cc
UserControl.
Neo tt c cc mt ca iu khin TreeView bng cch s dng ca s thuc tnh
nh thy trong nh chp mn hnh ny:
Sao chp cc bc di y d n ca bn. t cc bc sau Sub End ca th tc
"addAnEnt" trong Lab3. Lm vic qua cc bc to ra PaletteSet v thm cc s
kin C s d liu.
'1. Thm mt tham kho n PresentationCore. (S dng cc tab trn NET'Hp
thoi Add Reference. iu ny l cn thit cho cc PaletteSet'Chng ta s
khai bo bc 3.
'2. S dng Tuyn b Nhp khu Autodesk.AutoCAD.Windows namespace
'3. Khai bo mt bin PaletteSet (ton cu) l mt PaletteSet. (N s'Ch
c th c to ra mt ln). Thm tuyn b ny sau khi AddAnEnt End Sub'T Lab
3.
'4. Khai bo mt bin nh UserControl1. y l s kim sot to'Trong cc bc
trong ti liu Lab4. Vic kim sot ny s c t'Do PaletteSet to bc 3.
'5. Thm mt lnh mi c tn bng. S dng cc CommandMethod"Thuc tnh v to
Sub s chy khi lnh c chy'Trong AutoCAD."Lu : Cho End Sub sau khi bc
10.
'6. Thm mt "nu th" bo co v kim tra xem cc'PaletteSet tuyn b
trong bc 3 l bng g. N s l'Khng c g ln u tin lnh c chy.'Ch : t "End
If" sau khi bc 9
'7. PaletteSet l g y chng ti to ra aa PaletteSet mi'Vi mt GUID
duy nht. S dng cc t kha mi. Hy Tn Parameter'"Palette ca ti". i vi
cc tham s ToolID to ra mt GUID mi.'Trn menu Tools chn "Create
Guid". Trn To GUID'Dialog chn "Registry Format" Chn New GUID v bn
sao."Dn GUID s dng nh l cc Guid mi. Thay Curley'Ning rng vi du ngoc
kp. (Cc tham s cho New Guid l mt chui k t)
'8. Khi to cc bin UserControl1 to trong'Bc 4. S dng cc t kha mi.
(New UserControl1)'iu khin ny cha cc iu khin cy.
'9. Thm cc UserControl n PaletteSet. S dng phng thc Add'Ca
PaletteSet khi to bc 7. S dng "Palette1" choTham s tn v iu khin khi
to bc 8 choTham s th hai.
'10. Hin th paletteset bng cch lm cho cc ti sn nhn thy
ca'PaletteSet bng ng s tht. Ln th hai lnh c chy'Ny l m duy nht
trong quy trnh ny s c x l.
'11. Thm mt lnh c tn l "addDBEvents. S dng cc thuc tnh
CommandMethod'V thm cc th tc m s chy khi commmand c chy trong
AutoCAD"Lu : Cho End Sub sau khi bc 20
'12. Tin s dng mt "" Nu Sau , "tuyn b v xem cc bng mu'To bc 4 l
Khng c g.'Ch : t "End If" sau khi bc 15
'13. Khai bo mt intantiate mt i tng bin tp vin. S dng cc bin tp
vin'Ti sn ca Application.DocumentManager.MdiActiveDocument
'14. S dng cc phng php WriteMessage ca bin bin tp'To bc 13. S
dng ny cho cc tham s thng ip'VbCr + "Xin gi' bng 'lnh u tin"
'15. Exit Sub
'16. Khai bo mt bin Database v nhanh chng n bng cch lm cho
n"Ngang hng vi cc ti sn c s d liu
ca'Application.DocumentManager.MdiActiveDocument
'17. S dng cc tuyn b AddHandler c mt c s d liu ObjectAppended'S
kin. S dng cc s kin ObjectAppended ca bin c s d liu'To bc 16 cho
tham s u tin (Event). Cho phn th hai'Tham s (Delegate) s dng cu lnh
mi v to ra mt ObjectEventHandler.'S dng cc tuyn b AddressOf v tn ca
mt th tc (callback_ObjectAppended)'Bn s to ra trong bc 21.
'18. S dng cc tuyn b AddHandler c mt c s d liu ObjectErased'S
kin. S dng cc s kin ObjectErased ca bin c s d liu'To bc 16 cho tham
s u tin (Event). Cho phn th hai'Tham s (Delegate) s dng cu lnh mi v
to ra mt ObjectErasedEventHandler.'S dng cc tuyn b AddressOf v tn
ca mt th tc (callback_ObjectErased)'Bn s to ra bc 24.
'19. S dng cc tuyn b AddHandler c mt c s d liu
ObjectReappended'S kin. S dng cc s kin ObjectReappended ca bin c s
d liu'To bc 16 cho tham s u tin (Event). Cho phn th hai'Tham s
(Delegate) s dng cu lnh mi v to ra mt ObjectEventHandler.'S dng cc
tuyn b AddressOf v tn ca mt th tc (callback_ObjectReappended)'Bn s
to ra bc 32.
'20. S dng cc tuyn b AddHandler c mt c s d liu
ObjectUnappended'S kin. S dng cc s kin ObjectUnappended ca bin c s
d liu'To bc 16 cho tham s u tin (Event). Cho phn th hai'Tham s
(Delegate) s dng cu lnh mi v to ra mt ObjectEventHandler.'S dng cc
tuyn b AddressOf v tn ca mt th tc (callback_ObjectUnappended)'Bn s
to ra bc 35.
'21. To mt Sub Private tn callback_ObjectAppended. y l Chi m'S c
gi khi mt i tng c ni vo c s d liu. (Tn cn phi c'Tn c s dng trong cc
tham s i biu bc 17). Tham s u tin l mt'i tng. (S dng ByVal v ngi gi
l tn ca i tng). Tham s th hai l'Mt ObjectEventArgs. (S dng ByVal v
e nh tn ca ObjectEventArgs)"Lu : Cho End Sub sau khi bc 23
'22. Khai bo mt bin TreeNode.
(System.Windows.Forms.TreeNode)."Lu : Bn c th tit kim mt s cch g
bng cch s dng nhp khu v nhp khu cc khng gian tn"Nhanh chng n bng
cch s dng phng thc Add ca cc nt thuc tnh ca TreeView trn'UserForm
() to ra bc 4. S dng cc ObjectEventArgs truyn vo phng php cho'Tham
s chui v s dng cc "Type" ca DBObject. (e.DBObject.GetType ().
ToString ())
'23. Lm cho sn Tag ca nt to bc 22 bng vi ObjectId ca'Cc i tng ph
thm. iu ny s cho php chng ti ghi li n ObjectId cng nhn trong'Cc s
kin khc. S dng e.DBObject.ObjectId.ToString ()
'24. To mt Sub Private tn callback_ObjectErased. y l Chi m'S c
gi khi mt i tng c xa khi c s d liu. (Tn cn phi c'Tn c s dng trong
cc tham s i biu ca bc 18). Tham s u tin l mt'i tng. (S dng ByVal v
ngi gi l tn ca i tng). Tham s th hai l'Mt ObjectErasedEventArgs. (S
dng ByVal v e nh tn ca ObjectErasedEventArgs)"Lu : Cho End Sub trc
khi bc 32
'25. s dng mt "Nu Else" tuyn b v kim tra ti sn ca cc b
xa'ObjectErasedEventArgs truyn vo hm. (e.Erased)'Ch : t "Else"
stament trc khi bc 30 v "End If" sau khi bc 31
"26. y chng ta s tm kim mt i tng trong iu khin TreeView n c th c
g b.'To mt bo ng cho tng tuyn b. S dng nt cho cc tn phn t v cc loi
l'Forms.Treenode. Paramater nhm l cc nt trong
TreeView.'(MyPalette.TreeView1.Nodes)'Ch : t cu lnh tip theo di bc
29. (trc khi "Else" tuyn b) "
'27. S dng mt "Nu Sau ," tuyn b. Kim tra xem cc nt Tag l
ObjectId'Ca cc i tng b xa. S dng cc ti sn ca cc
DBObject'ObjectErasedEventArgs thng qua vo s kin ny.
(e.DBObject.ObjectId.ToString)'Ch : t "End If" trn "Next" tuyn b ni
thm trong bc 23
'28. Hy b cc nt bng cch gi phng thc Remove. (Thc th l'B xa khi
bn v).
"29. Thot khi i vi loop. (Thot i)
'30. Nu iu ny c x l th c ngha l cc i tng c unerased. (e.Erased l
sai)'Khai bo mt System.Windows.Forms.TreeNode s dng newNode nh tn.
Nhanh chng n bi"Bng cch s dng phng thc Add ca b su tp cc nt ca
TreeView to ra trong bc trc.'S dng cc Loi i tng cho cc tham
s.'E.DBObject.GetType (). ToString ()
'31. Lm cho sn Tag ca nt to bc 30 bng vi ObjectId ca'i tng
unerased. iu ny s cho php chng ti ghi li n ObjectId cng nhn
trong'Cc s kin khc. S dng e.DBObject.ObjectId.ToString ()
'32. To mt Sub Private tn callback_ObjectReappended. y l Chi m'S
c gi khi mt i tng c ReAppended n c s d liu. (Tn cn phi c'Tn c s dng
trong cc tham s i biu ca bc 19). Tham s u tin l mt'i tng. (S dng
ByVal v ngi gi l tn ca i tng). Tham s th hai l'Mt ObjectEventArgs.
(S dng ByVal v e nh tn ca ObjectEventArgs)"Lu : Cho End Sub sau khi
bc 34
'33. Thm tn lp ca i tng xem cy'Khai bo mt bin TreeNode.
(System.Windows.Forms.TreeNode). nhanh chng' bng phng thc Add ca ti
sn Nodes ca TreeView trn UserForm1'To ra bc 4. S dng cc
ObjectEventArgs truyn vo phng php cho chui'Tham s v s dng cc "Type"
ca DBObject. (e.DBObject.GetType (). ToString ())
34. Ghi id ca n cng nhn sau'Lm cho sn Tag ca nt to bc 33 bng vi
ObjectId ca'i tng unerased. iu ny s cho php chng ti ghi li n
ObjectId cng nhn trong'Cc s kin khc. S dng
e.DBObject.ObjectId.ToString ()
'35. To mt Sub Private tn callback_ObjectUnappended. y l Chi m'S
c gi khi mt i tng l UnAppended t cc c s d liu. (Tn cn phi c'Tn c s
dng trong cc tham s i biu ca bc 20). Tham s u tin l mt'i tng. (S
dng ByVal v ngi gi l tn ca i tng). Tham s th hai l'Mt
ObjectEventArgs. (S dng ByVal v e nh tn ca ObjectEventArgs)"Lu :
Cho End Sub sau khi bc 39
"36. y chng ta s tm kim mt i tng trong iu khin TreeView n c th c
g b.'To mt bo ng cho tng tuyn b. S dng nt cho cc tn phn t v cc loi
l'Forms.Treenode. Paramater nhm l cc nt trong
TreeView.'(MyPalette.TreeView1.Nodes)'Ch : t "Next" tuyn b sau khi
bc 39
'37. S dng v "Nu Sau ," tuyn b v xem nu nt ny l iu chng ta
mun.'So snh node.Tag n ObjectId. (s dng
e.DBObject.ObjectId.ToString)'Ch : t "End If" sau khi bc 39
"38. Nu chng ti c y th y l nt cho cc i tng unappended.'Gi phng
thc Remove ca nt.
"39. Thot khi i vi loop.
