wpf - Bind DataTemplate's parent's visibility (IsVisible or Visibility) to the ViewModel -

-

starting off classic datatemplate:

<datatemplate x:key="regulartemplate">     <grid>      ...    </grid>  </datatemplate>

assume viewmodel object being rendered using above template has following property:

    private visibility _visibility;     public visibility vmvisibility     {         set         {             if (value == _visibility) return;             _visibility = value;             if (value == system.windows.visibility.visible)             {                 viewrefresher.twentysecondstick += tick;             }             else             {                 viewrefresher.twentysecondstick -= tick;             }         }          private         {             return _visibility;         }     }

i want setter code somehow run when listboxitem not rendered panel containing it. it's custom panel hides/shows items during scrolling, need bind listboxitems's visibility somehow.

i've tried stuff along lines of:

<datatemplate x:key="regulartemplate">      <grid>      ...     </grid>      <datatrigger binding="{binding isvisible,relativesource=                       {relativesource findancestor,                         ancestortype={x:type listboxitem}}}" value="false">          <setter  property="{binding vmvisibility}" value="false"/>      </datatrigger>  </datatemplate>

but can't use datatriggers way.

any ideas?

don't hate when spend 2 hours searching solution, give up, post on stackoverflow, find 5 minutes later?

answer:

using guy's behaviour: https://stackoverflow.com/a/3667609/855551

you can bind isvisible of parent viewmodel:

<datatemplate x:key="regulartemplate">  <grid> <behaviour:datapiping.datapipes>         <behaviour:datapipecollection>               <behaviour:datapipe source="{binding relativesource=                    {relativesource ancestortype={x:type listboxitem}},                           path=isvisible}"                      target="{binding path=visible, mode=onewaytosource}"/>               </behaviour:datapipecollection>         </behaviour:datapiping.datapipes>  ... </grid>   </datatemplate>

vm object:

    private bool _visible;     public bool visible     {         set         {             if (value == _visible) return;             _visible = value;             if (value == true)                 enablerefresh();             else                 disablerefresh();         }          private         {             return _visible;         }     }

Comments

Post a Comment

Popular posts from this blog

django - How can I change user group without delete record -

-
on website user have 1 group. , user can change group. it's made user.groups.clear() and user.groups.add(new_group) but it's not efficient, because there 2 sql query: delete, insert. how can change group update query? user , group related each other using manytomanyfield . means intersection table exists relating both entities, , if don't specify model map (using through attribute) django creates 1 you. looking @ sources django.contrib.auth.models see that's case. fortunatly, can access intermediary model using through attribute of manager (in case, user.groups.through ). can use regular model. example: >>> alice = user.objects.create_user('alice', 'alice@example.com', 'alicepw') >>> employee = group.objects.create(name='employee') >>> manager = group.objects.create(name='manager') >>> alice.groups.add(employee) >>> alice.groups.all() [<group: employee...
Read more

java - Need to add SOAP security token -

-
i need set custom soap header attribute on jax-ws generated webservice client. case webservice calls must go through proxy server requiring specific token (recieved web request header) present in soap request header. e.g.: 1 carserviceservice service = null; 2 service = new carserviceservice(new url(url), new qname(qname); 3 carserviceendpoint port = service.getcarserviceport(); it seems in line 3 wsdl retrieved , call fails due missing security token. 1 point direction on how done? a detailed example has been mentioned here: creating , deploying jax-ws web service on tomcat 6 this article shows how create , use security token .
Read more

java - EclipseLink JPA Object is not a known entity type -

-
i have strange problem eclipselink , object want persist. have 1 object (keypointlistimpl) stores object keypointimpl in list. persisting keypointimpl objects works great if try persist keypointlistimpl object java.lang.illegalargumentexception says object keypointimpl isn't known entity type. here keypointimpl code: @entity @table(name="keypoints") public class keypointimpl implements keypoint { @id @generatedvalue(strategy = generationtype.identity) private int id; @enumerated(enumtype.string) private detectortype keypointtype; private float x; private float y; private float size; private float angle; private float response; private int octave; private int classid; ... } here keypointlistimpl code: @entity @table(name="keypointlists") public class keypointlistimpl implements keypointlist { @id @generatedvalue(strategy = generationtype.identity) private int id; @onetoone(cascade={ca...
Read more