init search on page feature once

src/app/browser/window/tab/item/page/search.rs

@@ -0,0 +1,83 @@
+mod buffer;
+mod form;
+mod placeholder;
+
+use buffer::Buffer;
+use form::Form;
+use placeholder::Placeholder;
+
+use gtk::{
+    prelude::{BoxExt, WidgetExt},
+    Align, Box, Orientation, TextBuffer,
+};
+use std::{cell::RefCell, rc::Rc};
+
+pub struct Search {
+    buffer: Rc<RefCell<Option<Buffer>>>,
+    pub form: Rc<Form>,
+    pub placeholder: Rc<Placeholder>,
+    pub g_box: Box,
+}
+
+impl Search {
+    // Constructors
+
+    /// Create new `Self`
+    pub fn new() -> Self {
+        // Init components
+        let buffer = Rc::new(RefCell::new(None));
+        let form = Rc::new(Form::new(&buffer));
+        let placeholder = Rc::new(Placeholder::new());
+
+        // Init main container
+        let g_box = Box::builder()
+            .orientation(Orientation::Vertical)
+            .valign(Align::Center)
+            .vexpand(false)
+            .visible(false)
+            .build();
+
+        g_box.append(&form.g_box);
+        g_box.append(&placeholder.label);
+
+        // Done
+        Self {
+            buffer,
+            form,
+            g_box,
+            placeholder,
+        }
+    }
+
+    // Actions
+
+    pub fn show(&self) {
+        if self.buffer.borrow().is_some() {
+            self.form.show();
+            self.placeholder.hide();
+        } else {
+            self.form.hide();
+            self.placeholder.show();
+        }
+        self.g_box.set_visible(true)
+    }
+
+    pub fn hide(&self) {
+        self.g_box.set_visible(false)
+    }
+
+    pub fn toggle(&self) {
+        if self.g_box.is_visible() {
+            self.hide()
+        } else {
+            self.show()
+        }
+    }
+
+    pub fn update(&self, text_buffer: Option<TextBuffer>) {
+        self.buffer.replace(match text_buffer {
+            Some(buffer) => Some(Buffer::new(buffer)),
+            None => None,
+        });
+    }
+}