asp.net textbox barcode scanner Figure 13-33. Final project interface in Objective-C

Making Quick Response Code in Objective-C Figure 13-33. Final project interface

Figure 13-33. Final project interface
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Step 1: Start New Project
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Enter My Text Editor for the name, and select Application for Project Type. No template will be used.
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CHAPTER 13 ADVANCED USER INTERACTION
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Step 2: Add Resources
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No resources will be added to the project.
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Step 3: Set Up Windows
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Open the main window, and set its properties. (Use your discretion in setting its properties, or you may leave the default settings as they are.)
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Step 4: Design the Interface
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You will set up the main window to allow the user to click or drop a file onto the Get File button to open it. The name of the file opened will display in the text field, and the contents of the file will display in the text view (the large text box with the scrollbar). When the user clicks the Save File button, the text in the text view will be saved over the original file if changes have been made. You will add some buttons, a text view, and a text field to the window.
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Buttons
Add a button to the window, and place it at the top left. Name the button pshFiles, and give it the title Get File. Duplicate the button by pressing Cmd+D with the button still selected. You will want a horizontal offset of 0; the vertical offset is not critical. Try 200 as a value. Rename the duplicated button pshSave, and give it the title Save File. To handle a drop event (should your user drop a file on the pshiles button), you need to set the pshFiles button up to accept a drop. To do this, click the button and select the Drag & Drop tab in the Info palette. Click the check box next to Filenames in the list. The button is now ready to accept a filename (see Figure 13-34).
Figure 13-34. Drag & Drop tab in the Info palette
Text View
The text view is identified by a scrollbar on the right side. Add a text view to the window, and resize by dragging resize handles as needed.
CHAPTER 13 ADVANCED USER INTERACTION
Several objects in FaceSpan 4 are nested inside other objects. The text view is an example. When you drag the text view onto a window, you will notice that the title for the Info palette is Scroll View. The scroll view is the parent of the text view and gives it scrollbar behavior. Make sure you name the scroll view txtScroll. To access the text view, double-click the scroll view. Notice that the window dims to indicate you are inside a nested structure. To back out of the structure, you can click the little up arrow in the lower-right corner of the text view, use the Cmd-up arrow key combination, or click the window. If you want to set properties for the text view, make sure the Info palette displays the words Text View in its title bar (see Figure 13-35).
Figure 13-35. Text view
Text Field
Add a text field to the window, and resize as needed. Name the text field txtFile. You will also want to uncheck the Editable option in the Attributes pane because this field is for display purposes only.
Step 5: Edit Main Menu
A contextual menu is connected automatically to a text view and a text field to provide access to text formatting and spelling functionality. You may also want to add a text formatting menu to the application s main menu bar. Double-click Main Menu in the Project window to open the menu editor. Drag the Format item from the Menus group in the Objects Palette to the main menu bar (a line will appear where the menu will be inserted). The Format menu has a Font item and a Text item that open to display submenus. The functionality for the menu items in the Format menu is built in (see Figure 13-36).
Figure 13-36. Main menu Close the menu editor.
CHAPTER 13 ADVANCED USER INTERACTION
Step 6a: Attach Scripts
Open the project script. If Add Code for Standard Handlers is checked in the Editing tab in FaceSpan s preferences, the project script will include two handlers by default: launched and choose menu item. The project script is an ideal place to manage values that need to be available to various objects within the project. The functionality for managing values that are permanently stored with the application is provided by User Defaults. User Defaults is a system for storing an application s preferences as a collection of key/value pairs, allowing you to look up a value according to its key. The demonstration project will use code found in the Script Library to manage User Defaults. Ctrl-click an empty line in the script window to open the Script Library. In the GetSetSave collection you will find the entry UserDefaultList. This provides the code for managing User Defaults as a list of values. When the entry is selected, the code is dumped to the cursor location in the Script Edit window. Notice that the code includes property statements. You will need to cut and paste them at the top of the project script. The comments suggest that the UserDefaultsList subroutine be called as part of the project s will finish launching event. Cut the call to the UserDefaultsList subroutine (it will be pasted in the next step into the will finish launching handler).
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