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Re: forcing scroll bars in widget_draw [message #39269 is a reply to message #39268]

Mon, 10 May 2004 13:09

btt
Messages: 345
Registered: December 2000

Senior Member

Benjamin Hornberger wrote:
> Hi all,
>
> is there a way to force scroll bars in a draw widget even if the draw
> size is smaller than or as big as the viewport (the scroll bar should be
> inactive then)? I would like to have that because eventually the size of
> the draw area will be increased, and if the scroll bars appear just
> then, the size of the base widget would change, which is kind of ugly.
>

Hi,

You can define a 'big' drawing canvas (see XSIZE and YSIZE keywords)
with a 'small' viewing port (see X_SCROLL_SIZE and Y_SCROLL_SIZE
keywords). It doesn't work to make the canvas equal to or smaller than
the viewport (in fact, I think the canvas must be quite a bit larger
than the viewport to get scroll bars.)

The following example defines the viewport size as the image size but
defines the drawing canvas as 3 times bigger than the image size. Note
the call to WIDGET_CONTROL to change the coordinates of the viewport.

Ben

PRO ScrollTest

base = Widget_Base()

dim = [200,200]
img = BYTSCL(Hanning(Dim[0], dim[1]), top= 200B) + 55B
draw = Widget_Draw(base, $
Retain = 2, $
Xsize = dim[0] * 3, $
Ysize = dim[1] * 3, $
X_Scroll_Size = dim[0], $
Y_Scroll_Size = dim[1])

Widget_Control, base, /realize
Widget_Control, draw, Set_Draw_View = [dim[0], dim[1]]

TV, img, dim[0], dim[1]

XMANAGER, 'ScrollTest', base

END

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[Message index]

		Re: forcing scroll bars in widget_draw By: btt on Mon, 10 May 2004 13:29
		Re: forcing scroll bars in widget_draw By: David Fanning on Mon, 10 May 2004 13:16
		Re: forcing scroll bars in widget_draw By: btt on Mon, 10 May 2004 13:09
		Re: forcing scroll bars in widget_draw By: David Fanning on Mon, 10 May 2004 12:26
		Re: forcing scroll bars in widget_draw By: David Fanning on Mon, 10 May 2004 14:12

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