Booa8 Slide 09

Buliding Object-Oriented Applications in PowerBuilder Module 9: Methods

Objectives ,[object Object],[object Object],[object Object]

Topics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Overview ,[object Object],[object Object],[object Object],[object Object]

Availability of User-Defined Methods Class Application Menu User Object Window Window Control Object Function Yes Yes Yes Yes No Events Yes * Yes * Yes Yes Yes * New in PowerBuilder .0

Method Invocation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Invocation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Events Execution ,[object Object],w_anc1 w_anc2 w_anc3 w_invoice {w_anc1} ue_Update( ) {w_anc1} ue_Update( ) {w_anc2} ue_Update( ) {w_anc3} ue_Update( ) w_invoice ue_Update( )

Function Execution ,[object Object],[object Object],{w_anc1} ue_Update( ) {w_anc1} of_Save(string) {w_anc2} of_Save(int) {w_anc3} of_Save(boolean) w_invoice of_Save( )

Overriding Ancestor Event Scripts Uncheck to override script

Overriding Ancestor Event Scripts ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],{w_anc1} ue_Update( ) {w_anc1} ue_Update( ) {w_anc2} ue_Update( ) {w_anc3} ue_Update( ) w_invoice ue_Update( )

Overriding Ancestor Function Scripts ,[object Object],[object Object]

Overriding Ancestor Function Scripts ,[object Object],[object Object],[object Object],[object Object],w_invoice.of_Save( ) {w_anc1} ue_Update( ) {w_anc1} of_Save( ) {w_anc2} of_Save(int) {w_anc3} of_Save(boolean) w_invoice of_Save( )

Extending Event Scripts ,[object Object],{w_anc1} ue_Update( ) {w_anc1} ue_Update( ) {w_anc2} ue_Update( ) {w_anc3} ue_Update( ) w_invoice ue_Update( )

Extending Functions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Overriding and Invoking Ancestor Script ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],{w_anc1} ue_Update( ) 2. {w_anc1} ue_Update( ) 3. {w_anc2} ue_Update( ) 4. {w_anc3} ue_Update( ) 1. w_invoice ue_Update( )

Function Overloading ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Function Overloading ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Familiar Examples of Function Overloading ,[object Object]

Post Versus Trigger ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Post Versus Trigger ,[object Object],[object Object],[object Object],[object Object],[object Object]

Additional Considerations ,[object Object],[object Object],[object Object],[object Object]

Additional Considerations ,[object Object],[object Object],[object Object],[object Object],[object Object]

TriggerEvent ( ) and PostEvent ( ) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Defining Event Arguments — Review ,[object Object],[object Object],[object Object],[object Object],[object Object]

Return Values ,[object Object],[object Object],[object Object]

Methods During Development ,[object Object],[object Object],[object Object],[object Object]

Bypassing Compiler Validation ,[object Object],[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object]

Booa8 Slide 09

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Booa8 Slide 09