How to center a Grid of Frames in a CentralPanel?

[kirillmeisser]

I have a 4 column grid containing Frames and I want to center this Grid in the center of the CentralPanel. I have tried calling the centered_and_justified method but it did not help. I have also not found any properties of the egiu::Grid struct that can help me with this endeavor. I am out of ideas and asking for help.

This is the frame:

fn generate_frame(ui: &mut Ui, workflow_name: &str, last_activity: &str) {
        egui::Frame::default()
            .stroke(egui::Stroke::new(1.0, ui.style().visuals.window_stroke.color)) // Border stroke
            .corner_radius(egui::CornerRadius::same(3))
            .show(ui, |ui| {
                ui.vertical( |ui| {
                    egui::Image::new(include_image!("../../assets/thumbnail_240x180.png")).fit_to_exact_size(Vec2::new(240f32, 180f32)).ui(ui);
                    ui.add_space(5f32);

                    ui.horizontal(|ui| {
                        ui.add_space(5f32);
                        ui.label(workflow_name);
                        ui.add_space(5f32);
                    });

                    ui.horizontal(|ui| {
                        ui.add_space(5f32);
                        ui.label(format!("Last activity: {} ago", last_activity));
                        ui.add_space(5f32);
                    });

                    ui.add_space(5f32);
                });

            });
    }

This is how I add them to the CentralPanel:

egui::CentralPanel::default()
            .show(ctx, move |ui| {
                egui::ScrollArea::vertical()
                    .auto_shrink(false)
                    .show(ui, |ui| {
                        ui.add_space(20f32);
                        ui.heading("What are we doing today?");
                        ui.add_space(30f32);

                        egui::Grid::new("my_grid")
                            .spacing(Vec2::new(32f32, 32f32))
                            .show(ui, |ui| {
                                let entries_per_row = 4;
                                for i in 0..19 {
                                    Self::generate_frame(ui, format!("Workflow {}", i).as_str(), "1 min");
                                    if (i + 1) % entries_per_row == 0 {
                                        ui.end_row()
                                    }
                                }

                            });
                    });
            });

Any help would be greatly appreciated!

P.S.: It seems that this issue has already been raised in #546 but there have been no answers