GPS: Add a dialog to select the elements

This dialog allows to select and see element
and its details.

src/gps.ui

@@ -36,57 +36,6 @@
       </object>
     </child>
   </object>
-  <object class="GtkDialog" id="dialog-add-plugin">
-    <property name="can-focus">False</property>
-    <property name="default-width">320</property>
-    <property name="default-height">260</property>
-    <property name="type-hint">dialog</property>
-    <child internal-child="vbox">
-      <object class="GtkBox">
-        <property name="can-focus">False</property>
-        <property name="orientation">vertical</property>
-        <property name="spacing">2</property>
-        <child internal-child="action_area">
-          <object class="GtkButtonBox">
-            <property name="can-focus">False</property>
-            <property name="layout-style">end</property>
-            <child>
-              <placeholder/>
-            </child>
-            <child>
-              <placeholder/>
-            </child>
-          </object>
-          <packing>
-            <property name="expand">False</property>
-            <property name="fill">False</property>
-            <property name="position">0</property>
-          </packing>
-        </child>
-        <child>
-          <object class="GtkScrolledWindow">
-            <property name="visible">True</property>
-            <property name="can-focus">True</property>
-            <property name="shadow-type">in</property>
-            <child>
-              <object class="GtkTreeView">
-                <property name="visible">True</property>
-                <property name="can-focus">True</property>
-                <child internal-child="selection">
-                  <object class="GtkTreeSelection"/>
-                </child>
-              </object>
-            </child>
-          </object>
-          <packing>
-            <property name="expand">False</property>
-            <property name="fill">True</property>
-            <property name="position">1</property>
-          </packing>
-        </child>
-      </object>
-    </child>
-  </object>
   <object class="GtkFileChooserDialog" id="dialog-open-file">
     <property name="can-focus">False</property>
     <property name="type-hint">dialog</property>

src/main.rs

@@ -19,6 +19,8 @@
 // SPDX-License-Identifier: GPL-3.0-only
 mod mainwindow;
 mod pipeline;
+mod pluginlistwindow;
+
 use gtk::prelude::*;
 
 fn main() {

src/mainwindow.rs

@@ -9,6 +9,7 @@ use std::cell::RefCell;
 use std::rc::Rc;
 
 use crate::pipeline::Pipeline;
+use crate::pluginlistwindow;
 #[derive(Debug, Clone, Default)]
 struct Element {
     name: String,
@@ -68,15 +69,12 @@ pub fn build_ui(application: &gtk::Application) {
     let add_button: Button = builder
         .object("button-add-plugin")
         .expect("Couldn't get app_button");
-    let add_dialog: Dialog = builder
+
-        .object("dialog-add-plugin")
-        .expect("Couldn't get window");
     add_button.connect_clicked(glib::clone!(@weak window => move |_| {
         // entry.set_text("Clicked!");
         let pipeline = Pipeline::new();
-        Pipeline::get_elements_list().expect("cocuou");
+        let elements = Pipeline::get_elements_list().expect("cocuou");
-        add_dialog.connect_response(|dialog, _| dialog.close());
+        pluginlistwindow::build_plugin_list(&window, &elements);
-        add_dialog.show_all();
     }));
     // Create a dialog to open a file
     let open_button: Button = builder

src/pluginlistwindow.rs

@@ -0,0 +1,121 @@
+use crate::pipeline::ElementInfo;
+use gtk::{
+    glib::{self, clone},
+    prelude::*,
+    ResponseType,
+};
+
+use gtk::{
+    ApplicationWindow, CellRendererText, Dialog, Label, ListStore, Orientation, TreeView,
+    TreeViewColumn, WindowPosition,
+};
+
+fn create_and_fill_model(elements: &Vec<ElementInfo>) -> ListStore {
+    // Creation of a model with two rows.
+    let model = ListStore::new(&[u32::static_type(), String::static_type()]);
+
+    // Filling up the tree view.
+    for (i, entry) in elements.iter().enumerate() {
+        model.insert_with_values(
+            None,
+            &[(0, &(i as u32 + 1)), (1, &entry.name.as_ref().unwrap())],
+        );
+    }
+    model
+}
+
+fn append_column(tree: &TreeView, id: i32) {
+    let column = TreeViewColumn::new();
+    let cell = CellRendererText::new();
+
+    column.pack_start(&cell, true);
+    // Association of the view's column with the model's `id` column.
+    column.add_attribute(&cell, "text", id);
+    tree.append_column(&column);
+}
+
+fn create_and_setup_view() -> TreeView {
+    // Creating the tree view.
+    let tree = TreeView::new();
+
+    tree.set_headers_visible(false);
+    // Creating the two columns inside the view.
+    append_column(&tree, 0);
+    append_column(&tree, 1);
+    tree
+}
+
+pub fn build_plugin_list(window: &ApplicationWindow, elements: &Vec<ElementInfo>) {
+    let dialog = gtk::Dialog::with_buttons(
+        Some("Edit Item"),
+        Some(window),
+        gtk::DialogFlags::MODAL,
+        &[("Close", ResponseType::Close)],
+    );
+    dialog.set_title("Plugin list");
+    dialog.set_position(WindowPosition::Center);
+    dialog.set_default_size(640, 480);
+
+    // Creating a vertical layout to place both tree view and label in the window.
+    let vertical_layout = gtk::Box::new(Orientation::Vertical, 0);
+
+    // Creation of the label.
+    let label = Label::new(Some(""));
+
+    let tree = create_and_setup_view();
+
+    let model = create_and_fill_model(elements);
+    // Setting the model into the view.
+    tree.set_model(Some(&model));
+
+    // Adding the view to the layout.
+    vertical_layout.add(&tree);
+    // Same goes for the label.
+    vertical_layout.add(&label);
+
+    // The closure responds to selection changes by connection to "::cursor-changed" signal,
+    // that gets emitted when the cursor moves (focus changes).
+    tree.connect_cursor_changed(clone!(@weak dialog => move |tree_view| {
+        let selection = tree_view.selection();
+        if let Some((model, iter)) = selection.selected() {
+            // Now getting back the values from the row corresponding to the
+            // iterator `iter`.
+            //
+            // The `get_value` method do the conversion between the gtk type and Rust.
+            label.set_text(&format!(
+                "Hello '{}' from row {}",
+                model
+                    .value(&iter, 1)
+                    .get::<String>()
+                    .expect("Treeview selection, column 1"),
+                model
+                    .value(&iter, 0)
+                    .get::<u32>()
+                    .expect("Treeview selection, column 0"),
+            ));
+            println!(
+                "{}",
+                model
+                    .value(&iter, 1)
+                    .get::<String>()
+                    .expect("Treeview selection, column 1")
+            );
+
+            let element_name = model
+            .value(&iter, 1)
+            .get::<String>()
+            .expect("Treeview selection, column 1");
+            //dialog.close();
+            println!("{}", element_name);
+        }
+    }));
+
+    // Adding the layout to the window.
+    let content_area = dialog.content_area();
+    let scrolled_window = gtk::ScrolledWindow::new(gtk::NONE_ADJUSTMENT, gtk::NONE_ADJUSTMENT);
+    scrolled_window.add(&vertical_layout);
+    content_area.add(&scrolled_window);
+
+    dialog.connect_response(|dialog, _| dialog.close());
+    dialog.show_all();
+}