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What is the difference between getText () and getSelection () SWT Spinner?

For control Spinner

in SWT, what is the difference between getText()

and getSelection()

? The only thing I can make out is the return type. However, I cannot enter any text, only numbers are allowed.

GetText (): Returns a string containing a copy of the content of the recipient's text box, or an empty string if there is no content.

GetSelection (): Returns a selection that is the position of the receiver.

So why do we have two different getters, and which one should I use?

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3 answers


Since it Spinner

is a numeric selection, you have to go with getSelection()

, since it returns exactly what was selected.



I don't know why it getText()

exists, but it will return a representation of the String

selected value, eg. if it getSelection()

returns int

7

, it getText()

will return String

"7"

.

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As stated in the documentation, getText()

returns the string as if it were currently displayed, including possible non-numeric values ​​or values ​​outside the min / max range. getSelection()

returns the current or last valid integer value.



You usually want to use getSelection()

. Does this answer your question?

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  • getText

    in particular says that it can be empty (I'm guessing it's platform dependent if that happens). It then distinguishes this case from the value 0.

  • You can use getText

    when used Spinner

    with decimal digits (see http://help.eclipse.org/luna/topic/org.eclipse.platform.doc.isv/reference/api/org/eclipse/swt/widgets/Spinner.html #setDigits (int) ), since getSelection

    in this case it is further from the value of the value. But note that the decimal separator depends on the current locale.

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