effectcraft/crates/ui-egui/tests/ui_project_rows.rs

//! Project panel rows: a folder's twirl and an item's label swatch take their own clicks, over
//! the row's click / drag area (#152).

use effectcraft_engine::Session;
use effectcraft_engine::color::Label;
use effectcraft_engine::project::{ItemId, ItemKind};
use effectcraft_ui_egui::EffectcraftApp;
use egui::{Event, Modifiers, Pos2, pos2};
use egui_kittest::Harness;
use egui_kittest::kittest::Queryable;
use serde_json::json;

/// A closed folder holding a comp, and a solid at the project root: (harness, folder, comp, solid).
fn harness() -> (Harness<'static, EffectcraftApp>, ItemId, ItemId, ItemId) {
    let mut s = Session::default();
    let comp = ItemId(s.execute("comp.new", json!({"name": "Main", "width": 320, "height": 180, "duration": 4})).unwrap()["comp"].as_u64().unwrap());
    s.execute("layer.newSolid", json!({"name": "Solid", "color": "#406080"})).unwrap();
    let solid = s.project.items.values().find(|i| matches!(i.kind, ItemKind::Solid(_))).unwrap().id;
    let folder = ItemId(s.execute("project.newFolder", json!({"name": "Folder"})).unwrap()["item"].as_u64().unwrap());
    s.execute("project.move", json!({"items": [comp.0], "folder": folder.0})).unwrap();
    s.execute("project.move", json!({"items": [solid.0], "folder": null})).unwrap();
    s.execute("project.select", json!({"items": []})).unwrap();
    let mut h = Harness::builder().with_size(egui::vec2(1600.0, 1000.0)).build_eframe(|_| EffectcraftApp::new(s));
    h.run_steps(3);
    (h, folder, comp, solid)
}

fn center(h: &Harness<'_, EffectcraftApp>, id: &str) -> Pos2 {
    let e = h.state().auto.find(id).unwrap_or_else(|| panic!("no {id}")).clone();
    pos2(e.rect[0] + e.rect[2] / 2.0, e.rect[1] + e.rect[3] / 2.0)
}

fn button(h: &mut Harness<'_, EffectcraftApp>, p: Pos2, pressed: bool) {
    h.input_mut().events.push(Event::PointerButton { pos: p, button: egui::PointerButton::Primary, pressed, modifiers: Modifiers::NONE });
}

fn click_at(h: &mut Harness<'_, EffectcraftApp>, p: Pos2) {
    h.input_mut().events.push(Event::PointerMoved(p));
    h.step();
    button(h, p, true);
    h.step();
    button(h, p, false);
    h.run_steps(3);
}

/// Both clicks in one frame: the harness' frame time is longer than a double-click's.
fn double_click_at(h: &mut Harness<'_, EffectcraftApp>, p: Pos2) {
    h.input_mut().events.push(Event::PointerMoved(p));
    h.step();
    for _ in 0..2 {
        button(h, p, true);
        button(h, p, false);
    }
    h.run_steps(3);
}

fn click(h: &mut Harness<'_, EffectcraftApp>, id: &str) {
    let p = center(h, id);
    click_at(h, p);
}

#[test]
fn folder_twirl_opens_and_closes_the_folder_on_one_click() {
    let (mut h, folder, comp, _) = harness();
    let twirl = format!("project.item.{}.twirl", folder.0);
    let comp_row = format!("project.item.{}", comp.0);
    assert!(!h.state().ui.project_open_folders.contains(&folder.0));
    assert!(h.state().auto.find(&comp_row).is_none(), "the closed folder hides its comp");
    click(&mut h, &twirl);
    assert!(h.state().ui.project_open_folders.contains(&folder.0), "one click on the twirl opens the folder");
    assert!(h.state().auto.find(&comp_row).is_some(), "the open folder shows its comp");
    assert!(h.state().session.state.project_selection.is_empty(), "the twirl does not select the folder");
    click(&mut h, &twirl);
    assert!(!h.state().ui.project_open_folders.contains(&folder.0), "a second click closes it");
    // The row under the twirl still selects on a click and twirls on a double-click.
    let name = center(&h, &format!("project.item.{}.name", folder.0));
    click_at(&mut h, name);
    assert_eq!(h.state().session.state.project_selection, vec![folder]);
    double_click_at(&mut h, name);
    assert!(h.state().ui.project_open_folders.contains(&folder.0), "a double-click on the row opens the folder");
}

#[test]
fn label_swatch_opens_the_label_menu() {
    let (mut h, _, _, solid) = harness();
    assert_ne!(h.state().session.project.item(solid).unwrap().label, Label::Green);
    let green = h.state().session.prefs.label_name(Label::Green);
    assert!(h.query_by_label(&green).is_none());
    click(&mut h, &format!("project.item.{}.label", solid.0));
    assert!(h.state().session.state.project_selection.is_empty(), "the swatch does not select the row");
    let entry = h.query_by_label(&green).expect("the label menu is open").rect();
    let undo = h.state().session.history.undo.len();
    click_at(&mut h, entry.center());
    assert_eq!(h.state().session.project.item(solid).unwrap().label, Label::Green);
    assert_eq!(h.state().session.history.undo.len(), undo + 1);
    assert!(h.query_by_label(&green).is_none(), "the menu closed after the choice");
}

/// Dragging from the Project panel's empty area draws a selection box that selects the rows it
/// touches; a click there deselects (#203).
#[test]
fn dragging_in_the_empty_area_box_selects_items() {
    let (mut h, folder, _, solid) = harness();
    let list = h.state().auto.find("project.empty").unwrap().rect;
    let from = pos2(list[0] + 40.0, list[1] + list[3] - 6.0);
    let to = center(&h, &format!("project.item.{}.name", folder.0));
    h.input_mut().events.push(Event::PointerMoved(from));
    h.step();
    button(&mut h, from, true);
    h.step();
    for k in 1..=6 {
        h.input_mut().events.push(Event::PointerMoved(from + (to - from) * (k as f32 / 6.0)));
        h.step();
    }
    button(&mut h, to, false);
    h.run_steps(2);
    let sel = h.state().session.state.project_selection.clone();
    assert!(sel.contains(&folder) && sel.contains(&solid), "{sel:?}");
    click_at(&mut h, from);
    assert!(h.state().session.state.project_selection.is_empty());
}

/// A Project panel shorter than its scroll bar's thumb draws instead of panicking: an empty
/// project in a 1280 × 800 browser window at device pixel ratio 2 (640 × 400 points) left the
/// list too short for the thumb's 16-point minimum (#231).
#[test]
fn a_short_project_panel_draws() {
    for height in [400.0, 300.0] {
        let mut h = Harness::builder().with_size(egui::vec2(640.0, height)).build_eframe(|_| EffectcraftApp::new(Session::default()));
        h.run_steps(3);
        assert!(h.state().auto.find("project.empty").is_some(), "the Project panel drew at {height} points");
    }
}