# GUI Visual Refresh Implementation Plan

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** Refresh the PySide6 main window into a clean light desktop-tool style and apply A-share profit/loss colors to all PnL-like fields.

**Architecture:** Keep the existing `MainWindow` layout and data flow. Add focused UI helpers in `main_window.py` for theme setup, table setup, and PnL styling, then cover them with lightweight offscreen GUI tests.

**Tech Stack:** Python 3.11+, PySide6, pytest.

---

## File Structure

- Modify `src/grid_trading/ui/main_window.py`: apply QSS theme, assign object names, centralize table setup, and style PnL labels/items.
- Modify `tests/test_ui.py`: add offscreen GUI tests for theme markers and profit/loss item styling.
- No domain, service, storage, or database changes.

### Task 1: Add Failing GUI Tests

**Files:**
- Test: `tests/test_ui.py`

- [ ] **Step 1: Write failing tests for theme markers and PnL colors**

```python
def test_main_window_applies_light_theme(tmp_path, monkeypatch):
    monkeypatch.setenv("QT_QPA_PLATFORM", "offscreen")

    from PySide6.QtWidgets import QApplication
    from grid_trading.services.trading_service import TradingService
    from grid_trading.ui.main_window import MainWindow

    app = QApplication.instance() or QApplication([])
    service = TradingService(tmp_path / "grid.db")
    window = MainWindow(service)

    assert window.centralWidget().objectName() == "appRoot"
    assert window.holdings_table.alternatingRowColors()
    assert "QMainWindow" in window.styleSheet()

    window.close()
    service.close()
    app.processEvents()
```

```python
def test_profit_and_loss_cells_use_a_share_colors(tmp_path, monkeypatch):
    monkeypatch.setenv("QT_QPA_PLATFORM", "offscreen")

    from datetime import datetime
    from decimal import Decimal
    from PySide6.QtGui import QColor
    from PySide6.QtWidgets import QApplication
    from grid_trading.domain.models import PositionSummary
    from grid_trading.services.trading_service import TradingService
    from grid_trading.ui.main_window import MainWindow

    app = QApplication.instance() or QApplication([])
    service = TradingService(tmp_path / "grid.db")
    window = MainWindow(service)
    window._positions = [
        PositionSummary(
            instrument_id=1,
            code="510300",
            name="沪深300ETF",
            total_quantity=100,
            available_quantity=100,
            base_quantity=0,
            grid_quantity=100,
            remaining_cost=Decimal("1000"),
            average_cost=Decimal("10"),
            position_breakeven_price=Decimal("10"),
            account_breakeven_price=Decimal("10"),
            realized_pnl=Decimal("12.34"),
            grid_profit=Decimal("-5.67"),
            current_price=Decimal("10.50"),
            market_value=Decimal("1050"),
            floating_pnl=Decimal("50"),
            last_quote_at=datetime(2026, 7, 9, 10, 0, 0),
        )
    ]

    window._fill_holdings_table()

    profit_item = window.holdings_table.item(0, 10)
    loss_item = window.holdings_table.item(0, 11)
    assert profit_item.foreground().color() == QColor("#c62828")
    assert profit_item.font().bold()
    assert loss_item.foreground().color() == QColor("#2e7d32")
    assert loss_item.font().bold()

    window.close()
    service.close()
    app.processEvents()
```

- [ ] **Step 2: Run the tests and verify they fail**

Run:

```bash
pytest tests/test_ui.py::test_main_window_applies_light_theme tests/test_ui.py::test_profit_and_loss_cells_use_a_share_colors -q
```

Expected: both new tests fail because object names, theme QSS, alternating row setup, and PnL item colors do not exist yet.

### Task 2: Add Light Theme and Shared Table Setup

**Files:**
- Modify: `src/grid_trading/ui/main_window.py`

- [ ] **Step 1: Add imports and theme constants**

Add `Decimal`, `QBrush`, `QColor`, `QFont`, and `QAbstractItemView` imports needed by the helpers.

- [ ] **Step 2: Apply theme in `_build_ui`**

Set `root.setObjectName("appRoot")`, call `self._apply_light_theme()`, and set object names on the navigation, summary card frames, toolbar buttons, tab widget, and tables.

- [ ] **Step 3: Add `_apply_light_theme` and `_configure_table`**

Create helpers that set the QSS theme once and apply consistent table settings: alternating rows, row selection, no editing, visible grid, row height, and header resize behavior.

- [ ] **Step 4: Run theme test**

Run:

```bash
pytest tests/test_ui.py::test_main_window_applies_light_theme -q
```

Expected: PASS.

### Task 3: Add PnL Styling Helpers

**Files:**
- Modify: `src/grid_trading/ui/main_window.py`

- [ ] **Step 1: Add `_style_pnl_item`, `_style_pnl_label`, and `_make_item`**

Use the raw `Decimal | None` value, not the formatted string, to decide color and font weight:

- `value > 0`: foreground `#c62828`, bold.
- `value < 0`: foreground `#2e7d32`, bold.
- otherwise: default foreground, non-bold.

- [ ] **Step 2: Use helpers in summary and tables**

Apply the helpers to summary floating PnL and these table columns:

- holdings: columns 10, 11, 12.
- grid levels: column 6.
- open grid lots: column 5.
- grid matches: column 7.

- [ ] **Step 3: Run PnL style test**

Run:

```bash
pytest tests/test_ui.py::test_profit_and_loss_cells_use_a_share_colors -q
```

Expected: PASS.

### Task 4: Full Verification

**Files:**
- No additional changes expected.

- [ ] **Step 1: Run UI test module**

Run:

```bash
pytest tests/test_ui.py -q
```

Expected: PASS.

- [ ] **Step 2: Run full test suite**

Run:

```bash
pytest -q
```

Expected: PASS.

- [ ] **Step 3: Review diff**

Run:

```bash
git diff -- src/grid_trading/ui/main_window.py tests/test_ui.py docs/superpowers/specs/2026-07-09-gui-visual-refresh-design.md docs/superpowers/plans/2026-07-09-gui-visual-refresh.md
```

Expected: diff only contains the UI theme, PnL styling, tests, and docs for this task.