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The code in Listing 22-4, which you ll find in the file javafxcontrols/TextBox1fx, creates three text box controls and places them in a scene, as shown in Figure 22-15 In the following sections, we discuss the variables and functions of the TextBox class, including those inherited from TextInputControl
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Figure 22-15
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Illustrating the TextBox control
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The TextBox Control
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Listing 22-4
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var scene:Scene; Stage { title: TextBox #1 scene: scene = Scene { width: 200 content: [ VBox { fillWidth: false height: bind sceneheight width: bind scenewidth spacing: 16 padding: Insets { top: 5 left: 5 bottom: 5 right: 5 } content: [ TextBox { columns: 10 promptText: Name layoutInfo: LayoutInfo { hfill: false } } TextBox { columns: 15 lines: 5 multiline: true promptText: Address layoutInfo: LayoutInfo { vgrow: PriorityNEVER hfill: false } } TextBox { columns: 15 promptText: Email address layoutInfo: LayoutInfo { hfill: false } } ] } ] } }
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As you can see, all three text boxes initially display a string that acts as a hint as to what the user should enter into the fieldThis text, which is set using the promptText variable,
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is rendered using a lighter color than real content and is displayed only when the text box would otherwise be empty
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TextBox Width
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The columns variable specifies the number of characters that the text box should display horizontally, which is ten by defaultThe text box takes this as a hint as to how wide it should make the control s visual representation the exact width of the control will depend on the font in useThe top and bottom text boxes shown in Figure 22-15 have respectively 10 and 15 columns Notice that we use the hfill variable of a LayoutInfo object to ensure that these controls are given their preferred widths, because otherwise the VBox container would expand all three of them to match the width of the widest, as a result of the fact that the getHGrow() and getHFill() functions of the TextBox class both return true The column count is not a limit on the number of characters that may be entered into the text box there is no way to control that If the user enters more characters than the control can display, the text will be scrolled so that the insertion cursor (which is called the caret and is represented by a vertical bar) is always visibleYou can use the arrow keys on your keyboard or the mouse to move the insertion cursor, which allows you to insert new text anywhere you want to, or delete existing text by using the Delete or Backspace keysAs you ll see in the section Selection, later in this chapter, you can also move the caret, change the cursor, and delete content programmatically
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The height of the TextBox is set based on the font in use and, if the multiline variable is true, the value of the lines variableThe middle TextBox in Figure 22-15 is configured to show five lines of text and, as you can see, it is large enough to display all of these lines A multiline TextBox allows itself to be resized vertically to absorb extra space in the container In Listing 22-4, we prevent this behavior by setting the vgrow variable of its LayoutInfo object to false If the user were to type more than five lines of text into this control, a scrollbar would appear to allow all of the text to be viewed
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By default, the user is allowed to edit the content of a text boxThis might seem to be obvious, but there are cases when you might not want this to be allowed For example, suppose you have designed a form that shows a view of a record in a database by displaying the values from that record in text boxesYou might want to allow some users to update the record while only allowing others to read itTo do this, you need to switch the text box into a mode in which the user cannot type into itYou can do this by setting the editable variable to false, as shown on line 19 of the code in Listing 22-5, which you ll find in the file javafxcontrols/TextBox2fxYou can see the result of running this code in Figure 22-16
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