ContextMenuDataContext is null with Module CanClick handler method

Anonymous User

I've configured a button to appear on the layer context menu, so that it calls CopyUVRToStyle on the module, which it does successfully and examines ContextMenuDataContext without any issues.

However ... when it accesses the CanCopyUVRToStyle property, ContextMenuDataContext is always null.

The documentation suggests keeping an _enabled variable. 

ProConcepts Framework · Esri/arcgis-pro-sdk Wiki · GitHub 

Is there an event that fires somewhere (like OnContextMenu?) that the module can subscribe to and examine the ContextMenuDataContext and set the _enabled variable accordingly?

https://github.com/Esri/arcgis-pro-sdk/wiki/ProConcepts-Framework#delegate-commands

Wolf

You can create you own state & condition for this.  Make the following changes to your config.daml:

Add the following before the <modules> tag:

  <SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>conditions</SPAN><SPAN class="punctuation token">></SPAN></SPAN>
    <SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>insertCondition</SPAN> <SPAN class="attr-name token">id</SPAN><SPAN class="attr-value token"><SPAN class="punctuation token">=</SPAN><SPAN class="punctuation token">"</SPAN>has_UVR_Condition<SPAN class="punctuation token">"</SPAN></SPAN> <SPAN class="attr-name token">caption</SPAN><SPAN class="attr-value token"><SPAN class="punctuation token">=</SPAN><SPAN class="punctuation token">"</SPAN>Feature Layer with UVR<SPAN class="punctuation token">"</SPAN></SPAN><SPAN class="punctuation token">></SPAN></SPAN>
      <SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"><</SPAN>state</SPAN> <SPAN class="attr-name token">id</SPAN><SPAN class="attr-value token"><SPAN class="punctuation token">=</SPAN><SPAN class="punctuation token">"</SPAN>has_UVR_State<SPAN class="punctuation token">"</SPAN></SPAN> <SPAN class="punctuation token">/></SPAN></SPAN>
    <SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"></</SPAN>insertCondition</SPAN><SPAN class="punctuation token">></SPAN></SPAN>
  <SPAN class="token tag"><SPAN class="token tag"><SPAN class="punctuation token"></</SPAN>conditions</SPAN><SPAN class="punctuation token">></SPAN></SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

set the <insertModule tag's attribute: autoLoad to true:

<insertModule id="TestContextMenu_Module" className="Module1" autoLoad="true"<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

Change you button's condition to the new "has_UVR_Condition":

<button id="TestContextMenu_LayerContextMenu_Items_Button1" 
        caption="Show Selected FeatLyr Name"
        className="TestContextMenu_Module:OnMenuButtonClick" 
        loadOnClick="true" keytip="B1"
        condition="has_UVR_Condition"
        ...<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

and finally add this code to Module1.cs:

    <SPAN class="keyword token">internal</SPAN> <SPAN class="token function">Module1</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
    <SPAN class="punctuation token">{</SPAN>
      TOCSelectionChangedEvent<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Subscribe</SPAN><SPAN class="punctuation token">(</SPAN>CheckRenderer<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
    <SPAN class="punctuation token">}</SPAN>

    <SPAN class="comment token">/// <summary></SPAN>
    <SPAN class="comment token">/// This method makes sure</SPAN>
    <SPAN class="comment token">/// 1. The Mapview is Active</SPAN>
    <SPAN class="comment token">/// 2. There is exactly one layer selected</SPAN>
    <SPAN class="comment token">/// 3. The selected Layer is a FeatureLayer</SPAN>
    <SPAN class="comment token">/// 4. The feature layer's rendered is a unique value renderer</SPAN>
    <SPAN class="comment token">/// then sets the state for has_UVR_State & condition</SPAN>
    <SPAN class="comment token">/// </summary></SPAN>
    <SPAN class="comment token">/// <param name="mapViewEventArgs"></param></SPAN>
    <SPAN class="keyword token">private</SPAN> <SPAN class="keyword token">async</SPAN> <SPAN class="keyword token">void</SPAN> <SPAN class="token function">CheckRenderer</SPAN><SPAN class="punctuation token">(</SPAN>MapViewEventArgs mapViewEventArgs<SPAN class="punctuation token">)</SPAN>
    <SPAN class="punctuation token">{</SPAN>
      <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>mapViewEventArgs<SPAN class="punctuation token">.</SPAN>MapView <SPAN class="operator token">==</SPAN> <SPAN class="keyword token">null</SPAN> <SPAN class="operator token">||</SPAN> <SPAN class="punctuation token">(</SPAN>
          mapViewEventArgs<SPAN class="punctuation token">.</SPAN>MapView<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetSelectedLayers</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">.</SPAN>Count <SPAN class="operator token">!=</SPAN> <SPAN class="number token">1</SPAN> <SPAN class="operator token">||</SPAN>
          <SPAN class="operator token">!</SPAN><SPAN class="punctuation token">(</SPAN>mapViewEventArgs<SPAN class="punctuation token">.</SPAN>MapView<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetSelectedLayers</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="keyword token">is</SPAN> FeatureLayer<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
      <SPAN class="punctuation token">{</SPAN>
        <SPAN class="token function">SetState</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"has_UVR_State"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">false</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
        <SPAN class="keyword token">return</SPAN><SPAN class="punctuation token">;</SPAN>
      <SPAN class="punctuation token">}</SPAN>
      <SPAN class="keyword token">var</SPAN> bFeatLry <SPAN class="operator token">=</SPAN> mapViewEventArgs<SPAN class="punctuation token">.</SPAN>MapView<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetSelectedLayers</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="keyword token">as</SPAN> FeatureLayer<SPAN class="punctuation token">;</SPAN>
      SetState <SPAN class="punctuation token">(</SPAN><SPAN class="string token">"has_UVR_State"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">await</SPAN> QueuedTask<SPAN class="punctuation token">.</SPAN>Run <SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">=</SPAN><SPAN class="operator token">></SPAN> bFeatLry<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GetRenderer</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">is</SPAN> CIMUniqueValueRenderer<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
    <SPAN class="punctuation token">}</SPAN>

    <SPAN class="keyword token">internal</SPAN> <SPAN class="keyword token">static</SPAN> <SPAN class="keyword token">void</SPAN> <SPAN class="token function">SetState</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">string</SPAN> stateName<SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">bool</SPAN> active<SPAN class="punctuation token">)</SPAN>
    <SPAN class="punctuation token">{</SPAN>
      <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>FrameworkApplication<SPAN class="punctuation token">.</SPAN>State<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Contains</SPAN><SPAN class="punctuation token">(</SPAN>stateName<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">==</SPAN> active<SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">return</SPAN><SPAN class="punctuation token">;</SPAN>
      <SPAN class="comment token">// toggle the state</SPAN>
      <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>FrameworkApplication<SPAN class="punctuation token">.</SPAN>State<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Contains</SPAN><SPAN class="punctuation token">(</SPAN>stateName<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
      <SPAN class="punctuation token">{</SPAN>
        <SPAN class="comment token">//deactivates the state</SPAN>
        FrameworkApplication<SPAN class="punctuation token">.</SPAN>State<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Deactivate</SPAN><SPAN class="punctuation token">(</SPAN>stateName<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
      <SPAN class="punctuation token">}</SPAN>
      <SPAN class="keyword token">else</SPAN>
      <SPAN class="punctuation token">{</SPAN>
        <SPAN class="comment token">//activates the state</SPAN>
        FrameworkApplication<SPAN class="punctuation token">.</SPAN>State<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Activate</SPAN><SPAN class="punctuation token">(</SPAN>stateName<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
      <SPAN class="punctuation token">}</SPAN>
    <SPAN class="punctuation token">}</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>