Initial squadrons implementation.

Doesn't actually do anything yet, but squadrons are created for each
aircraft type and pilots will be created as needed to fill flights.

https://github.com/dcs-liberation/dcs_liberation/issues/276

qt_ui/windows/SquadronDialog.py

@@ -0,0 +1,142 @@
+from typing import Optional
+
+from PySide2.QtCore import (
+    QItemSelectionModel,
+    QModelIndex,
+    QSize,
+    Qt,
+)
+from PySide2.QtGui import QFont, QFontMetrics, QIcon, QPainter
+from PySide2.QtWidgets import (
+    QAbstractItemView,
+    QDialog,
+    QListView,
+    QStyle,
+    QStyleOptionViewItem,
+    QStyledItemDelegate,
+    QVBoxLayout,
+)
+
+from game.squadrons import Pilot
+from qt_ui.delegate_helpers import painter_context
+from qt_ui.models import SquadronModel
+
+
+class PilotDelegate(QStyledItemDelegate):
+    FONT_SIZE = 10
+    HMARGIN = 4
+    VMARGIN = 4
+
+    def __init__(self, squadron_model: SquadronModel) -> None:
+        super().__init__()
+        self.squadron_model = squadron_model
+
+    def get_font(self, option: QStyleOptionViewItem) -> QFont:
+        font = QFont(option.font)
+        font.setPointSize(self.FONT_SIZE)
+        return font
+
+    @staticmethod
+    def pilot(index: QModelIndex) -> Pilot:
+        return index.data(SquadronModel.PilotRole)
+
+    def first_row_text(self, index: QModelIndex) -> str:
+        return self.squadron_model.data(index, Qt.DisplayRole)
+
+    def second_row_text(self, index: QModelIndex) -> str:
+        return "Alive" if self.pilot(index).alive else "Dead"
+
+    def paint(
+        self, painter: QPainter, option: QStyleOptionViewItem, index: QModelIndex
+    ) -> None:
+        # Draw the list item with all the default selection styling, but with an
+        # invalid index so text formatting is left to us.
+        super().paint(painter, option, QModelIndex())
+
+        rect = option.rect.adjusted(
+            self.HMARGIN, self.VMARGIN, -self.HMARGIN, -self.VMARGIN
+        )
+
+        with painter_context(painter):
+            painter.setFont(self.get_font(option))
+
+            icon: Optional[QIcon] = index.data(Qt.DecorationRole)
+            if icon is not None:
+                icon.paint(
+                    painter,
+                    rect,
+                    Qt.AlignLeft | Qt.AlignVCenter,
+                    self.icon_mode(option),
+                    self.icon_state(option),
+                )
+
+            rect = rect.adjusted(self.icon_size(option).width() + self.HMARGIN, 0, 0, 0)
+            painter.drawText(rect, Qt.AlignLeft, self.first_row_text(index))
+            line2 = rect.adjusted(0, rect.height() / 2, 0, rect.height() / 2)
+            painter.drawText(line2, Qt.AlignLeft, self.second_row_text(index))
+
+    @staticmethod
+    def icon_mode(option: QStyleOptionViewItem) -> QIcon.Mode:
+        if not (option.state & QStyle.State_Enabled):
+            return QIcon.Disabled
+        elif option.state & QStyle.State_Selected:
+            return QIcon.Selected
+        elif option.state & QStyle.State_Active:
+            return QIcon.Active
+        return QIcon.Normal
+
+    @staticmethod
+    def icon_state(option: QStyleOptionViewItem) -> QIcon.State:
+        return QIcon.On if option.state & QStyle.State_Open else QIcon.Off
+
+    @staticmethod
+    def icon_size(option: QStyleOptionViewItem) -> QSize:
+        icon_size: Optional[QSize] = option.decorationSize
+        if icon_size is None:
+            return QSize(0, 0)
+        else:
+            return icon_size
+
+    def sizeHint(self, option: QStyleOptionViewItem, index: QModelIndex) -> QSize:
+        left = self.icon_size(option).width() + self.HMARGIN
+        metrics = QFontMetrics(self.get_font(option))
+        first = metrics.size(0, self.first_row_text(index))
+        second = metrics.size(0, self.second_row_text(index))
+        text_width = max(first.width(), second.width())
+        return QSize(
+            left + text_width + 2 * self.HMARGIN,
+            first.height() + second.height() + 2 * self.VMARGIN,
+        )
+
+
+class PilotList(QListView):
+    """List view for displaying a squadron's pilots."""
+
+    def __init__(self, squadron_model: SquadronModel) -> None:
+        super().__init__()
+        self.squadron_model = squadron_model
+
+        self.setItemDelegate(PilotDelegate(self.squadron_model))
+        self.setModel(self.squadron_model)
+        self.selectionModel().setCurrentIndex(
+            self.squadron_model.index(0, 0, QModelIndex()), QItemSelectionModel.Select
+        )
+
+        # self.setIconSize(QSize(91, 24))
+        self.setSelectionBehavior(QAbstractItemView.SelectItems)
+
+
+class SquadronDialog(QDialog):
+    """Dialog window showing a squadron."""
+
+    def __init__(self, squadron_model: SquadronModel, parent) -> None:
+        super().__init__(parent)
+
+        self.setMinimumSize(1000, 440)
+        self.setWindowTitle(squadron_model.squadron.name)
+        # TODO: self.setWindowIcon()
+
+        layout = QVBoxLayout()
+        self.setLayout(layout)
+
+        layout.addWidget(PilotList(squadron_model))