asp.net barcode scanning ADVANCED USER INTERACTION in Objective-C

Generating QR-Code in Objective-C ADVANCED USER INTERACTION

CHAPTER 13 ADVANCED USER INTERACTION
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Figure 13-27. Editing the label text
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Text Field
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The text field is the box in the Text Objects group that does not have a scrollbar. Add one to the window, and resize as desired. Name the text field txtInput in the Info palette. You may want to set a text formatter for this field to ensure that only text can be entered. For this, select Add Formatter from the Format menu. The formatter type should be Text by default. You may want to experiment with the various format options (see Figure 13-28).
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Figure 13-28. The Text Field Attribute pane
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Push Button
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Add a button to the main window. Name the button pshExecute. Label it Execute. You may want to give the button default behavior so it sends a clicked event when the user presses the Return key. For this, set Keyboard Equivalent in its Info palette to the Return option found in the pop-up (see Figure 13-29).
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CHAPTER 13 ADVANCED USER INTERACTION
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Figure 13-29. The Button Attribute pane
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Step 5: Edit Main Menu
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No alterations will be made to the main menu.
Step 6: Attach Scripts
This project will require that a script be added for the Execute button and the main window.
Execute Button Script
Create a script for the push button pshExecute by selecting it and choosing Script Add Script. The clicked handler for the button will call two subroutines: getUserInput, which gets the results of the user s input, and doMainProcess, where most of the code from the existing script will be placed. If FaceSpan preferences are set to Add Code for Standard Handlers (in Editing Preferences), the script will have a clicked handler as part of the button s script. Complete it as follows: on clicked theObject set {userOptions, userEntry} to getUserInput() doMainProcess(userOptions, userEntry) end clicked
Main Window Script
Create a script for the main window. A subroutine in this script, getUserInput, will collect the result of the user s interaction with the window items (see the listing that follows). While writing this subroutine, use the Object Browser in the Scripting Help drawer to add references to the user interface s objects. For instance, after typing set userOptions to name of every cell of in the first statement, double-click the entry for the matCheck matrix in the Object Browser (see Figure 13-30).
CHAPTER 13 ADVANCED USER INTERACTION
Figure 13-30. The Object Browser Notice that a complete reference to the matrix object, matrix "matCheck" of window "main", is added to your script. Since you want only the names of the check boxes that are checked, add the filter clause whose state is on state to the end of the full reference. Follow this procedure for adding a reference to the text field in the next statement. The completed subroutine looks like the following: on getUserInput() set userOptions to name of every cell of matrix "matCheck" of window "main" whose state is on state set userEntry to string value of text field "txtInput" of window "main" return {userOptions, userEntry} end getUserInput
Main Process Subroutine
Once the previous subroutines have obtained the data from the user interface, the main processing subroutine, doMainProcess, will process this data. Most of the code in the doMainProcess subroutine is taken directly from the existing script. Since this subroutine is called from the button s script, it could be placed in the script for the main window, in the script for the push button, or in the project script. This is one of the nice features of FaceSpan: you can place most subroutines wherever it makes the most sense to you (and perhaps the script). For demonstration, we have created the following dummy subroutine to indicate how this subroutine would be written.
Note
If you put the procedure in the script for the main window, you can use the Scripting Help drawer to create a reference to the text field.
In the main window s script, include the following: on doMainProcess(userOptions, userEntry) if "Option1" is in userOptions then --statements to perform if Option1 check box is checked say "Option 1 is selected." end if if "Option2" is in userOptions then --statements to perform if Option2 check box is checked say "Option 2 is selected." end if if "Option3" is in userOptions then --statements to perform if Option3 check box is checked say "Option 3 is selected." end if
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