preferences: add a preference dialog

Add a dialog to set user preference such
as gtk4paintablesink usage.

src/app.rs

@@ -271,6 +271,8 @@ impl GPSApp {
 
         application.add_action(&gio::SimpleAction::new("delete", None));
         application.set_accels_for_action("app.delete", &["<primary>d", "Delete"]);
+        application.add_action(&gio::SimpleAction::new("preferences", None));
+        application.set_accels_for_action("app.preferences", &["<primary>p"]);
 
         application.add_action(&gio::SimpleAction::new("quit", None));
         application.set_accels_for_action("app.quit", &["<primary>q"]);
@@ -505,6 +507,12 @@ impl GPSApp {
             });
         });
 
+        let app_weak = self.downgrade();
+        self.connect_app_menu_action("preferences", move |_, _| {
+            let app = upgrade_weak!(app_weak);
+            GPSUI::preferences::display_settings(&app);
+        });
+
         let app_weak = self.downgrade();
         self.connect_app_menu_action("delete", move |_, _| {
             let app = upgrade_weak!(app_weak);

src/gps/pipeline.rs

@@ -22,6 +22,7 @@ use crate::graphmanager::{GraphView, Node, NodeType, PortDirection, PropertyExt}
 
 use crate::gps::ElementInfo;
 use crate::logger;
+use crate::settings;
 use crate::GPS_INFO;
 
 use gst::glib;
@@ -85,7 +86,6 @@ impl Pipeline {
         #[cfg(feature = "gtk4-plugin")]
         {
             gstgtk4::plugin_register_static().expect("Failed to register gstgtk4 plugin");
-            ElementInfo::element_update_rank("gtk4paintablesink", gst::Rank::Primary);
         }
 
         Ok(pipeline)
@@ -98,6 +98,18 @@ impl Pipeline {
     pub fn create_pipeline(&self, description: &str) -> anyhow::Result<gst::Pipeline> {
         GPS_INFO!("Creating pipeline {}", description);
 
+        if settings::Settings::load_settings()
+            .preferences
+            .get("use_gtk4_sink")
+            .unwrap_or(&"true".to_string())
+            .parse::<bool>()
+            .expect("Should a boolean value")
+        {
+            ElementInfo::element_update_rank("gtk4paintablesink", gst::Rank::Primary);
+        } else {
+            ElementInfo::element_update_rank("gtk4paintablesink", gst::Rank::Marginal);
+        }
+
         // Create pipeline from the description
         let pipeline = gst::parse_launch(&description.to_string())?;
         let pipeline = pipeline.downcast::<gst::Pipeline>();

src/settings.rs

@@ -10,11 +10,14 @@ use crate::logger;
 
 #[derive(Debug, Serialize, Deserialize, Default)]
 pub struct Settings {
-    pub favorites: Vec<String>,
     pub app_maximized: bool,
     pub app_width: i32,
     pub app_height: i32,
+
+    // values must be emitted before tables
+    pub favorites: Vec<String>,
     pub paned_positions: HashMap<String, i32>,
+    pub preferences: HashMap<String, String>,
 }
 
 impl Settings {

src/ui/gps.ui

@@ -18,6 +18,11 @@
         <attribute name="action">app.save_as</attribute>
         <attribute name="accel">&lt;primary&gt;n</attribute>
       </item>
+      <item>
+        <attribute name="label" translatable="yes" comments="Primary menu entry that open the preferences">_Preferences</attribute>
+        <attribute name="action">app.preferences</attribute>
+        <attribute name="accel">&lt;primary&gt;p</attribute>
+      </item>
       <item>
         <attribute name="label" translatable="yes" comments="Primary menu entry that opens the About dialog.">_About GstPipelineStudio</attribute>
         <attribute name="action">app.about</attribute>

src/ui/mod.rs

@@ -20,5 +20,6 @@ pub mod about;
 pub mod elements;
 pub mod logger;
 pub mod message;
+pub mod preferences;
 pub mod properties;
 pub mod treeview;

src/ui/preferences.rs

@@ -0,0 +1,84 @@
+// preferences.rs
+//
+// Copyright 2022 Stéphane Cerveau <scerveau@collabora.com>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// SPDX-License-Identifier: GPL-3.0-only
+use crate::app::GPSApp;
+
+use crate::settings;
+
+use gtk::glib;
+use gtk::prelude::*;
+
+pub fn display_settings(app: &GPSApp) {
+    let dialog = gtk::Dialog::with_buttons(
+        Some("GPS settings"),
+        Some(&app.window),
+        gtk::DialogFlags::MODAL,
+        &[("Close", gtk::ResponseType::Close)],
+    );
+
+    dialog.set_default_size(640, 480);
+    dialog.set_modal(true);
+
+    let grid = gtk::Grid::new();
+    grid.set_column_spacing(4);
+    grid.set_row_spacing(4);
+    grid.set_margin_bottom(12);
+
+    let label = gtk::Label::builder()
+        .label("Use gtk4paintablesink element for video rendering:")
+        .hexpand(true)
+        .halign(gtk::Align::Start)
+        .margin_start(4)
+        .build();
+    let widget = gtk::CheckButton::new();
+    let settings = settings::Settings::load_settings();
+    widget.set_active(
+        settings
+            .preferences
+            .get("use_gtk4_sink")
+            .unwrap_or(&"true".to_string())
+            .parse::<bool>()
+            .expect("Should a boolean value"),
+    );
+    widget.connect_toggled(glib::clone!(@weak widget => move |c| {
+        let mut settings = settings::Settings::load_settings();
+        settings.preferences.insert("use_gtk4_sink".to_string(), c.is_active().to_string());
+        settings::Settings::save_settings(&settings);
+    }));
+
+    grid.attach(&label, 0, 0, 1, 1);
+    grid.attach(&widget, 1, 0, 1, 1);
+
+    let scrolledwindow = gtk::ScrolledWindow::builder()
+        .hexpand(true)
+        .vexpand(true)
+        .build();
+    scrolledwindow.set_child(Some(&grid));
+    let content_area = dialog.content_area();
+    content_area.append(&scrolledwindow);
+    content_area.set_vexpand(true);
+    content_area.set_margin_start(10);
+    content_area.set_margin_end(10);
+    content_area.set_margin_top(10);
+    content_area.set_margin_bottom(10);
+
+    dialog.connect_response(move |dialog, _| {
+        dialog.destroy();
+    });
+    dialog.show();
+}