Using Swing Controls in Java

Printing QR Code in Java Using Swing Controls
24 Using Swing Controls
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Figure 24-14
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A noneditable combo box
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Using an Editable SwingComboBox
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When you set the editable variable of a SwingComboBox to true, the display area next to the drop-down arrow becomes an editable input field, as shown on the left of Figure 24-15The user can either select an item from the drop-down, in which case the behavior is the same as that of a noneditable combo box, or type an arbitrary value into the input field, as shown on the right of Figure 24-15
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Figure 24-15
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An editable combo box
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If the user chooses to type a value into the editor that is not an item from the dropdown list and presses the Enter key, the selectedIndex and selectedItem variables change to -1 and null, respectively, because a value has not been chosen from the items list in the controlYou can get the value that the user entered from the text variableThe following code, which you ll find in the file javafxswing/SwingComboBox2fx, monitors all three of these variables:
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var selectedIndex = bind comboselectedIndex on replace { println("Selected index is {selectedIndex}");
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The SwingSlider Class
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} var selectedItem = bind comboselectedItem on replace { println("Selected item value is {selectedItemvalue}"); } var selectedText = bind combotext on replace { println("Selected text is "); }
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The output from this code when a value is typed into the text editor is as follows:
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Selected Selected Selected Selected index is -1 item value is null text is [] text is [My Choice]
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If the user types a value that is the same as the text value of one of the objects in the items list, the effect is the same as if that item had been selected from the drop-down Here is the output that would result from the user entering the text Choice #4 into the input field and pressing Enter:
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SwingComboBoxItem Selected item value is 4 Selected index is 4 Selected text is [Choice #4]
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Note that the match must be exact even adding whitespace at the beginning or end of the text will cause the value to be seen as not matching an entry in the items list
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The SwingSlider Class
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The SwingSlider class lets the user select a numeric value from a contiguous range configured using its maximum and minimum variablesThe selection is made by dragging the slider s thumb along its trackTable 24-10 describes the variables of this class
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Table 24-10 Variable
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vertical minimum maximum value
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Variables of the SwingSlider Class Type
Boolean Integer Integer Integer
Access
RW RW RW RW
Default
false 0 100 50
Description
The orientation of the slider: true for vertical, false for horizontal The minimum value of the selectable range The maximum value of the selectable range The currently selected value
24 Using Swing Controls
The following code, from the file javafxswing/SwingSlider1fx, creates a slider that allows the user to select any integer value in the range 100 to 200, inclusive:
var value = 125 on replace { println("Value is {value}"); } Stage { title : "SwingSlider #1" var scene:Scene; scene: scene = Scene { width: 200 height: 50 content: [ SwingSlider { minimum: 100 maximum: 200 value: bind value with inverse; translateY: 10 translateX: 10 width: bind scenewidth - 20 } ] } }
The value variable of the SwingSlider is bidirectionally bound to a script variable called value that is initially set to 125, so when the slider first appears, the thumb is placed at the position that represents the value 125, as shown in Figure 24-16
Figure 24-16
Illustrating the SwingSlider control
As the thumb is moved along the slider s track, its value variable is updated to reflect its position Because of the binding, this will also cause the script variable to be set to the same value, and the trigger results in value being written to the console In a real application, the slider s value would be bound to some more useful application state The slider that is created by the SwingSlider class is a little bare It is not obvious what the possible range of values might be or what the selected value isYou can improve the user experience by using some of the features of the JSlider class that are not directly