Drag-and-drop

Common/Variance/UI/MainForm.cs

@@ -1099,6 +1099,11 @@ void UI(VarianceContextGUI _varianceContext)
             do2DLayerUI_exp(0, updateUI: true);
             addAllUIHandlers();
             commonVars.setHashes();
+
+            tabControl_main.DragEnter += dragEvent;
+            tabControl_main.DragOver += dragEvent;
+
+            tabControl_main.DragDrop += dragAndDrop;
         }
 
         enum layerLookUpOrder { ICV, OCV, SCDU, TCDU, XOL, YOL, HTPV, HTNV, VTPV, VTNV, WOB, LWR, LWR2 }

Common/Variance/UI/UIHandlers_file.cs

@@ -83,6 +83,55 @@ void saveEnabler()
             });
         }
 
+        void dragEvent(object sender, DragEventArgs e)
+        {
+            if (e.Data.ContainsUris)
+            {
+                // Check that we have a valid file somewhere in the dropped resources
+                for (int i = 0; i < e.Data.Uris.Length; i++)
+                {
+                    string[] tokens = e.Data.Uris[i].LocalPath.Split(new char[] { '.' });
+                    if ((tokens[tokens.Length - 1].ToUpper() == "VARIANCE") || (tokens[tokens.Length - 1].ToUpper() == "XML"))
+                    {
+                        e.Effects = DragEffects.Copy;
+                        break;
+                    }
+                }
+            }
+        }
+
+        void dragAndDrop(object sender, DragEventArgs e)
+        {
+            // Only allow a single selection; pick the first.
+            DataObject d = e.Data;
+            int length = d.Uris.Length;
+            if (length < 1)
+            {
+                return;
+            }
+
+            // Find our first file object.
+            int index = -1;
+            for (int i = 0; i < length; i++)
+            {
+                if (d.Uris[i].IsFile)
+                {
+                    // Actually a supported file?
+                    string[] tokens = d.Uris[i].LocalPath.Split(new char[] { '.' });
+                    if ((tokens[tokens.Length - 1].ToUpper() == "VARIANCE") || (tokens[tokens.Length - 1].ToUpper() == "XML"))
+                    {
+                        index = i;
+                        break;
+                    }
+                }
+            }
+
+            if (index != -1)
+            {
+                doLoad(d.Uris[index].LocalPath);
+            }
+        }
+
         void openHandler(object sender, EventArgs e)
         {
             // Need to request input file location and name.

Documentation/releases.html

@@ -214,11 +214,12 @@ <h1 class="western">Variance Release History</h1>
 
     <blockquote>
       <a name="releases_426"></a>
-      <h2 class="western">New to 4.2.6 (Jul 10 2020)</h2>
+      <h2 class="western">New to 4.2.6 (Jul 15 2020)</h2>
       <blockquote>
         <ul>
           <li>Viewport enhancements.</li>
           <li>Bug fix to update DOE settings on loading project.</li>
+          <li>Drag-and-drop support for project loading.</li>
         </ul>
       </blockquote>
     </blockquote>

Series 4.txt

@@ -4,6 +4,7 @@ Changelog for Variance
 
 	- Viewport enhancements.
 	- Bug fix to update DOE configuration with project load.
+	- Drag-and-drop support for project loading.
 
 4.2.5