feat: select dropped item (fluxxcode#197)

* select dropped item

src/file_dialog.rs

@@ -155,6 +155,9 @@ pub struct FileDialog {
     /// This is used to prevent the dialog from closing when pressing the escape key
     /// inside a text input.
     any_focused_last_frame: bool,
+
+    /// flag to set if files have been dropped
+    new_file_dropped: bool,
 }
 
 /// This tests if file dialog is send and sync.
@@ -229,6 +232,7 @@ impl FileDialog {
             init_search: false,
 
             any_focused_last_frame: false,
+            new_file_dropped: false,
         }
     }
 
@@ -1136,8 +1140,6 @@ impl FileDialog {
             self.cancel();
         }
 
-        let mut new_file_dropped = false;
-
         // Collect dropped files:
         ctx.input(|i| {
             // check if files were dropped
@@ -1146,18 +1148,20 @@ impl FileDialog {
                     if path.is_dir() {
                         // if we dropped a directory, go there
                         self.load_directory(path.as_path());
-                        new_file_dropped = true;
+                        self.new_file_dropped = true;
                     } else if let Some(parent) = path.parent() {
                         // else, go to the parent directory
                         self.load_directory(parent);
-                        new_file_dropped = true;
+                        self.select_item(&mut DirectoryEntry::from_path(&self.config, path));
+                        self.scroll_to_selection = true;
+                        self.new_file_dropped = true;
                     }
                 }
             }
         });
 
         // update GUI if we dropped a file
-        if new_file_dropped {
+        if self.new_file_dropped {
             ctx.request_repaint();
         }
     }
@@ -2048,6 +2052,12 @@ impl FileDialog {
                 true
             }
             DirectoryContentState::Finished => {
+                // don't override the selected dropped item with the active directory
+                if self.new_file_dropped {
+                    // clear the flag and return
+                    self.new_file_dropped = false;
+                    return true;
+                }
                 if let Some(dir) = self.current_directory() {
                     let mut dir_entry = DirectoryEntry::from_path(&self.config, dir);
                     self.select_item(&mut dir_entry);