feat: store the applied version of the filter

src/app.rs

@@ -32,7 +32,7 @@ pub struct LogViewerApp {
     track_item_align: Option<Align>,
     shortcuts: Shortcuts,
     should_scroll_to_end_on_load: bool,
-    // TODO 4: Add UI to set / unset field
+    // TODO 4: Add UI to set / unset row_idx_field_name
     /// When set adds a field with this name and populates it with the row numbers
     row_idx_field_name: Option<String>,
     /// Allows the user to dim the warning by clicking on it
@@ -492,6 +492,9 @@ impl LogViewerApp {
             ui.separator();
             self.filtering_ui(ui);
         });
+        ui.horizontal(|ui| {
+            self.unfilter_ui(ui);
+        });
     }
 
     fn filtering_ui(&mut self, ui: &mut egui::Ui) {
@@ -508,15 +511,8 @@ impl LogViewerApp {
                 }
             }
             let mut should_apply_filter = false;
-            if is_filter_enabled {
-                if shortcut_button(ui, "Apply", "", &self.shortcuts.apply_filter) {
-                    should_apply_filter = true;
-                }
-                if data.is_filtered()
-                    && shortcut_button(ui, "Unfilter", "Clears Filter", &self.shortcuts.unfilter)
-                {
-                    data.unfilter();
-                }
+            if is_filter_enabled && shortcut_button(ui, "Apply", "", &self.shortcuts.apply_filter) {
+                should_apply_filter = true;
             }
 
             if let Some(filter) = data.filter.as_mut() {
@@ -689,6 +685,18 @@ impl LogViewerApp {
             self.should_focus_search = true;
         }
     }
+
+    fn unfilter_ui(&mut self, ui: &mut egui::Ui) {
+        if let Some(data) = self.data.as_mut() {
+            if data.is_filtered() {
+                ui.label(format!("Applied Filter: {}", data.applied_filter_display()));
+                ui.separator();
+                if shortcut_button(ui, "Unfilter", "Clears Filter", &self.shortcuts.unfilter) {
+                    data.unfilter();
+                }
+            }
+        }
+    }
 }
 
 #[cfg(not(target_arch = "wasm32"))]

src/app/data.rs

@@ -23,6 +23,7 @@ pub struct Data {
     pub filter: Option<FilterConfig>,
     rows: Vec<LogRow>,
     filtered_rows: Option<Vec<usize>>,
+    applied_filter: Option<FilterConfig>,
 }
 
 #[derive(serde::Deserialize, serde::Serialize, Default, Debug, PartialEq, Eq, Clone)]
@@ -174,7 +175,7 @@ impl Data {
         // Collect other needed info before taking mutable borrow to appease the borrow checker (couldn't find another readable way)
         let is_filtered = self.is_filtered();
         let filter = if is_filtered {
-            self.filter.clone()
+            self.applied_filter.clone()
         } else {
             None
         };
@@ -235,12 +236,14 @@ impl Data {
     }
 
     pub fn is_filtered(&self) -> bool {
+        debug_assert_eq!(self.applied_filter.is_some(), self.filtered_rows.is_some());
         self.filtered_rows.is_some()
     }
 
     pub fn unfilter(&mut self) {
         let previous_real_index_selected = self.selected_row.map(|x| self.get_real_index(x));
         self.filtered_rows = None;
+        self.applied_filter = None;
         if let Some(old_selected) = previous_real_index_selected {
             self.selected_row = Some(old_selected);
         }
@@ -250,6 +253,7 @@ impl Data {
         if let Some(filter) = self.filter.as_ref() {
             let previous_real_index_selected = self.selected_row.map(|x| self.get_real_index(x));
 
+            self.applied_filter = self.filter.clone();
             self.filtered_rows = Some(
                 self.rows
                     .iter_mut()
@@ -285,6 +289,26 @@ impl Data {
             }
         }
     }
+
+    pub fn applied_filter_display(&self) -> String {
+        let Some(FilterConfig {
+            search_key,
+            filter_on,
+            is_case_sensitive,
+            comparator,
+        }) = self.applied_filter.as_ref()
+        else {
+            debug_assert!(false, "We really shouldn't end up here");
+            return "No Filter Applied".to_string();
+        };
+        format!(
+            "Search Key: {search_key} | Filter On: {filter_on} | Case Sensitive: {} | Comparator: {comparator}", 
+            if *is_case_sensitive {
+                "Yes"
+            } else {
+                "No"
+            })
+    }
 }
 
 /// If the slice of fields and values matches the filter then the indices of the fields that match are returned or None if it does not match

src/app/data/filter.rs

@@ -86,3 +86,18 @@ impl Display for Comparator {
         )
     }
 }
+
+impl Display for FilterOn {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            FilterOn::Any => write!(f, "Any"),
+            FilterOn::Field(name) => write!(f, "[Field Named: {name}]"),
+        }
+    }
+}
+
+impl Display for FieldSpecifier {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.name.fmt(f)
+    }
+}