JTextField, how to display from specified postions

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John_Woo - 21 Aug 2006 19:49 GMT

Hi,

let's say

JTextField f = new JTextField(100);

f.setText( "more than 100 letters..| <inside is 100 letters end");

in a case setSize(400,200), or supposed the wide-size for this f is
just 100-letters length.

what displayed is that, f displays the 100 letters which backford from
the end of the string,

like "inside is 100 letters end";

I'm wondering, how to make it display from a specified postion?

I've tried

javax.swing.BoundedRangeModel m = f.getHorizontalVisibility();
m.setValueIsAdjusting(true);
m.setValue(10); //display from postion 10 to the end.

but it changed nothing.

--
Thanks
John
Toronto

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Roland de Ruiter - 21 Aug 2006 20:25 GMT

> Hi,
>
[quoted text clipped - 26 lines]
> John
> Toronto

In these situations I've been using
f.setCaretPosition(0);
to "scroll" the field back to the beginning of the a very long text.

Of course setCaretPosition changes the position of the input caret. So
if you use f.setCaretPosition(10), a very long text just inserted into
the field would "scroll" back to the 10th character. Then when the user
types a character or digit on the keyboard (without using cursor keys
before), it will be inserted after the 10th character. Don't know if
this behavior/side-effect is what you want.

Signature

Regards,

Roland

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John_Woo - 21 Aug 2006 20:41 GMT

> > Hi,
> >
[quoted text clipped - 41 lines]
>
> Roland

Thanks lots, it worked for me.

Can you tell why
javax.swing.BoundedRangeModel m = f.getHorizontalVisibility();
m.setValueIsAdjusting(true);
m.setValue(10); //display from postion 10 to the end.

not working?

John

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Roland de Ruiter - 21 Aug 2006 21:40 GMT

>>> Hi,
>>>
[quoted text clipped - 52 lines]
>
> John

Seems to me a pixel offset rather than a character offset.
Method getHorizontalVisibility returns the same BoundedRangeModel
instance as the get/setScrollOffset methods are using. From the source
of JTextField:
public BoundedRangeModel getHorizontalVisibility() {
return visibility;
}

/**
* Gets the scroll offset, in pixels.
*
* @return the offset >= 0
*/
public int getScrollOffset() {
return visibility.getValue();
}

Signature

Regards,

Roland

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John_Woo - 21 Aug 2006 22:12 GMT

> >>> Hi,
> >>>
[quoted text clipped - 73 lines]
>
> Roland

I changed by two ways:

A. f.setScrollOffset(10); //50, 100,1000, or
B. javax.swing.BoundedRangeModel m = f.getHorizontalVisibility();
m.setValueIsAdjusting(true);
m.setValue(10);//50,100,1000

the f.getScrollOffset() in both methods;
always return 0 and didn't display the first part of string

you know why?

Thanks
John

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JTextField, how to display from specified postions

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