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<title>2.8.4 ScrolledWindow Object
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2.8.4 ScrolledWindow Object
ScrolledWindow objects are ControlsWindow objects with the following
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<td><nobr><b><tt id='l2h-
124' xml:id='l2h-
124'
class=
"method">scrollbars
</tt></b>(
</nobr></td>
<td><var></var><big>[
</big><var>wantx
</var><big>[
</big><var>,
wanty
</var><big>]
</big><var></var><big>]
</big><var></var>)
</td></tr></table></dt>
Create (or destroy) horizontal and vertical scrollbars. The arguments
specify which you want (default: both). The scrollbars always have
minimum
<code>0</code> and maximum
<code>32767</code>.
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline">
<td><nobr><b><tt id='l2h-
125' xml:id='l2h-
125'
class=
"method">getscrollbarvalues
</tt></b>(
</nobr></td>
<td><var></var>)
</td></tr></table></dt>
You must supply this method. It should return a tuple
<code>(
<var>x
</var>,
<var>y
</var>)
</code> giving the current position of the scrollbars (between
<code>0</code> and
<code>32767</code>). You can return
<code>None
</code> for either to
indicate the whole document is visible in that direction.
<dl><dt><table cellpadding=
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<td><nobr><b><tt id='l2h-
126' xml:id='l2h-
126'
class=
"method">updatescrollbars
</tt></b>(
</nobr></td>
<td><var></var>)
</td></tr></table></dt>
Call this method when the document has changed. It will call
<tt class=
"method">getscrollbarvalues()
</tt> and update the scrollbars.
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<td><nobr><b><tt id='l2h-
127' xml:id='l2h-
127'
class=
"method">scrollbar_callback
</tt></b>(
</nobr></td>
<td><var>which, what, value
</var>)
</td></tr></table></dt>
Supplied by you and called after user interaction.
<var>which
</var> will
be
<code>'x'
</code> or
<code>'y'
</code>,
<var>what
</var> will be
<code>'-'
</code>,
<code>'-
-'
</code>,
<code>'set'
</code>,
<code>'++'
</code> or
<code>'+'
</code>. For
<code>'set'
</code>,
<var>value
</var> will contain the new scrollbar position.
<dl><dt><table cellpadding=
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<td><nobr><b><tt id='l2h-
128' xml:id='l2h-
128'
class=
"method">scalebarvalues
</tt></b>(
</nobr></td>
curmin, curmax
</var>)
</td></tr></table></dt>
Auxiliary method to help you calculate values to return from
<tt class=
"method">getscrollbarvalues()
</tt>. You pass document minimum and maximum value
and topmost (leftmost) and bottommost (rightmost) visible values and
it returns the correct number or
<code>None
</code>.
<dl><dt><table cellpadding=
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<td><nobr><b><tt id='l2h-
129' xml:id='l2h-
129'
class=
"method">do_activate
</tt></b>(
</nobr></td>
<td><var>onoff, event
</var>)
</td></tr></table></dt>
Takes care of dimming/highlighting scrollbars when a window becomes
frontmost. If you override this method, call this one at the end of
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<td><nobr><b><tt id='l2h-
130' xml:id='l2h-
130'
class=
"method">do_postresize
</tt></b>(
</nobr></td>
<td><var>width, height, window
</var>)
</td></tr></table></dt>
Moves scrollbars to the correct position. Call this method initially
<dl><dt><table cellpadding=
"0" cellspacing=
"0"><tr valign=
"baseline">
<td><nobr><b><tt id='l2h-
131' xml:id='l2h-
131'
class=
"method">do_controlhit
</tt></b>(
</nobr></td>
<td><var>window, control,
pcode, event
</var>)
</td></tr></table></dt>
Handles scrollbar interaction. If you override it call this method
first, a nonzero return value indicates the hit was in the scrollbars
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<span class=
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2.4.2, documentation updated on
28 September
2005.
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