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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Hello,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">I’ve done some reading and can’t find anything on
non-contiguous selection of items in item views beyond : </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">“Selections are made up of <i>selection ranges</i>.
These efficiently maintain information about large selections of items by
recording only the starting and ending model indexes for each range of selected
items. Non-contiguous selections of items are constructed by using more than
one selection range to describe the selection.” - </span><a href="http://doc.trolltech.com/4.6/model-view-selection.html#concepts">http://doc.trolltech.com/4.6/model-view-selection.html#concepts</a><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Currently we have implemented a selection of items by scanning
each row in the model to see if it should be “selected” based on
certain criteria. Is there a faster way to do this as looping in Python
through a large (50,000 rows)? When selections can be specified with
selection ranges the selection is fast. However, our worst case scenario
is that every-other item need be selected: 25,000 selection ranges would be
created and then we would just be looping through everything again anyways.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Any ideas?</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Thanks,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Darryl</span></p>
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