OS.bee Customer Display
Contents
Customer Display
The Statemachine DSL (Finite State-Machine) covers the synchronization of external (slave) browsers to a main (master) browser connected to an OS.bee server. The requirement was mainly inspired by the need of a customer display for the OS.bee application OS.pos. In this context it was required to display data for the customer on a secondary display.
Multiple displays can be connected to a master just by using a pattern on the address line of the slave-browser:
http://server_host-name/osbpdisplay/#host-name_of_the_master?display=DialogNameDisplay (as defined in Dialog DSL)&locale=language tag of locale
► example: http://dv999.compex.de:8081/osbpdisplay/#dv999.compex.de?display=CashSlipDisplay&locale=de-DE
DisplayName must be followed by the postfix Display as the class is generated like this to be seprarate from other dialogs. Language tags specify a language locale with its country component, like "de-DE", "de-AT", "en-US", "en-EN". The country component is necessary to decide the currency symbol and other country specific formats.
Important prerequisite
In order to use external displays you must add the bundle org.eclipse.osbp.display to your product's launch configuration and set auto-start to true.
Technical changes in DSL model
changes in dto
- New dto "CustomerDisplayDto":
dto CustomerDisplayDto { var double totalAmount var boolean left var String message var boolean right var BlobMapping image ref CashSlipDto slip }
- totalAmount : total amount of all cash position.
- left & right : boolean value, define if this part will be shown on display.
- image : any image which will be shown on th display
- slip : reference the cash slip dto.
changes in UI
- New UI:
display Customer { rootType CustomerDisplayDto datasource main:CustomerDisplayDto datasource img:BlobConverter horizontalLayout { verticalLayout left { textfield(i18n noCaption readonly) message table(i18n noCaption) slip { scrollToBottom type CashPositionDto columns { column quantity column product.sku column product.product_name column price column amount } sort { column now asc } } align fill-left form(styles "os-cash-total") { decimalField(precision= 2 readonly) totalAmount } bind [this.message].value <-- img.input bind [this.slip].collection <-- main.slip.positions bind [this.totalAmount].value <-- main.totalAmount } verticalLayout right { image info bind img.input <-- main.^image bind [this.info].resource <-- img.output } bind [this.left].visible <-- main.left bind [this.right].visible <-- main.right } }
- In this display "customer", we define in the 2 parts(left part & right part), if they will be shown and what will be shown in UI.
changes in Functionlibrary
- New lines in operation "initImages" & operation "conputeTotal" :
operation initImages(IStateMachine stateMachine, Object [] params) { . . . stateMachine.set("CustomerDisplayImage", cashregister.store.company.companyImage) . . . }
- In operation "initImages", the image of customerDisplay could be set.
operation computeTotal(IStateMachine stateMachine) { . . . stateMachine.set("CustomerDisplayTotalAmount", amount); . . . }
- In operation "computeTotal", the total amount of CustomerDisplay could be calculated and set.
changes in Statemachine
Some new keywords are introduced for this new functionality:
-
display <DisplayName> using <DTOName>
-
dto <DTOAlias> type <DTOName> attach <DisplayName>
-
displayText text "some text" @<DisplayName> to <DTOAttribute>
-
The references of a DTO that is attached to a display are always synchronized across all connected displays. Single fields must be synchronized by displayText.
- ► e.g.:
display CustomerDisplay using CustomerDisplayDto
dto cashslip type CashSlipDto attach CustomerDisplay
displayText text "locked" @CustomerDisplay to message
- ► The referenced DTO must be the rootType of the Display definition in the ui model.
Now I will show the changes in statmachine:
- New events "dataProvider DataControl":
dataProvider DataControl { . . . dto cashslip type CashSlipDto attach CustomerDisplay dto customerDisplay type CustomerDisplayDto . . . }
- New events "peripheral PeripheralControl":
peripheral PeripheralControl { . . . display CustomerDisplay using CustomerDisplay . . . }
- Setting for customerDisplay, in state "IDLE":
trigger onStartUp actions transition LOCKED{ . . . displayText false @CustomerDisplay to ^left displayText true @CustomerDisplay to ^right . . . }
- Setting for customerDisplay, in state "LOCKED":
trigger onOk actions transition ATTENTIVE{ . . . displayText true @CustomerDisplay to ^left displayText false @CustomerDisplay to ^right . . . }
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