draft search navigation buttons

src/app/browser/window/tab/item/page/content/text/gemini/reader/widget.rs

@@ -56,6 +56,26 @@ impl Widget {
             }
         });
 
+        find.navigation.back.button.connect_clicked({
+            let text_view = text_view.clone();
+            let navigation = find.navigation.clone();
+            move |_| {
+                if let Some((mut start, _)) = navigation.back() {
+                    text_view.scroll_to_iter(&mut start, 0.0, false, 0.0, 0.0);
+                }
+            }
+        });
+
+        find.navigation.forward.button.connect_clicked({
+            let text_view = text_view.clone();
+            let navigation = find.navigation.clone();
+            move |_| {
+                if let Some((mut start, _)) = navigation.forward() {
+                    text_view.scroll_to_iter(&mut start, 0.0, false, 0.0, 0.0);
+                }
+            }
+        });
+
         find.close.connect_clicked({
             let text_view = text_view.clone();
             move |_| text_view.set_gutter(TextWindowType::Bottom, gtk::Widget::NONE)

src/app/browser/window/tab/item/page/content/text/gemini/reader/widget/find.rs

@@ -16,8 +16,9 @@ use std::rc::Rc;
 
 pub struct Find {
     pub close: Button,
-    pub input: Rc<Input>,
     pub g_box: Box,
+    pub input: Rc<Input>,
+    pub navigation: Rc<Navigation>,
 }
 
 impl Find {
@@ -83,8 +84,9 @@ impl Find {
         // Done
         Self {
             close,
-            input,
             g_box,
+            input,
+            navigation,
         }
     }
 }

src/app/browser/window/tab/item/page/content/text/gemini/reader/widget/find/navigation.rs

@@ -5,7 +5,10 @@ use back::Back;
 use forward::Forward;
 
 use gtk::{prelude::BoxExt, Box, Orientation, TextIter};
-use std::{cell::RefCell, rc::Rc};
+use std::{
+    cell::{Cell, RefCell},
+    rc::Rc,
+};
 
 const MARGIN: i32 = 6;
 
@@ -13,6 +16,7 @@ pub struct Navigation {
     pub back: Back,
     pub forward: Forward,
     pub g_box: Box,
+    index: Rc<Cell<usize>>,
     matches: Rc<RefCell<Vec<(TextIter, TextIter)>>>,
 }
 
@@ -22,6 +26,7 @@ impl Navigation {
     /// Create new `Self`
     pub fn new() -> Self {
         // Init shared matches holder
+        let index = Rc::new(Cell::new(0));
         let matches = Rc::new(RefCell::new(Vec::new()));
 
         // Init components
@@ -44,6 +49,7 @@ impl Navigation {
             back,
             forward,
             g_box,
+            index,
             matches,
         }
     }
@@ -53,15 +59,46 @@ impl Navigation {
     pub fn update(&self, matches: Vec<(TextIter, TextIter)>) {
         // Update self
         self.matches.replace(matches);
+        self.index.replace(0); // reset
 
         // Update child components
-        self.back.update(false);
+        self.back.update(self.is_match());
         self.forward.update(self.is_match());
     }
 
-    // pub fn back(&self) {}
+    pub fn back(&self) -> Option<(TextIter, TextIter)> {
+        let index = self.index.take();
+        match self.matches.borrow().get(back(index)) {
+            Some((start, end)) => {
+                self.index.replace(if index == 0 {
+                    len_to_index(self.matches.borrow().len())
+                } else {
+                    index
+                });
+                Some((start.clone(), end.clone()))
+            }
+            None => {
+                self.index
+                    .replace(len_to_index(self.matches.borrow().len())); // go last
+                None
+            }
+        }
+    }
 
-    // pub fn forward(&self) {}
+    pub fn forward(&self) -> Option<(TextIter, TextIter)> {
+        let index = self.index.take();
+        let next = forward(index);
+        match self.matches.borrow().get(next) {
+            Some((start, end)) => {
+                self.index.replace(next);
+                Some((start.clone(), end.clone()))
+            }
+            None => {
+                self.index.replace(0);
+                None
+            }
+        }
+    }
 
     // Getters
 
@@ -69,3 +106,15 @@ impl Navigation {
         !self.matches.borrow().is_empty()
     }
 }
+
+fn back(index: usize) -> usize {
+    index - 1
+}
+
+fn forward(index: usize) -> usize {
+    index + 1
+}
+
+fn len_to_index(len: usize) -> usize {
+    len - 1
+}