Add stylized theme to MainMenu (#12)

* Add stylized theme to MainMenu
Increase message queue memory size by 4
Add default_theme.theme
Refactor SampleGame.gd to better account for refactoring via @export nodes
Properly aligne SampleGame scene
Reorganize MainMenu into its own directory
Add main_menu_border_paper.png
Add main_menu_button.png

* Add background image to theme
Implement StyleBoxCombinedTexture
	Allows drawing an array of textures all at once
Make MainMenu Panel a PanelContainer for consistency

* Implement MainMenu button press, hover, and focus styles
Improve MainMenu button disabled style

* Add Godot's latest documentation to the README.md

2 files changed, 170 insertions, 0 deletions

diff --git a/game/src/Utility/StyleBoxCombinedTexture.gd b/game/src/Utility/StyleBoxCombinedTexture.gd
new file mode 100644
index 0000000..db54da4
--- /dev/null
+++ b/game/src/Utility/StyleBoxCombinedTexture.gd
@@ -0,0 +1,47 @@
+@tool
+extends StyleBox
+class_name StyleBoxCombinedTexture
+
+@export
+var texture_settings : Array[TextureSetting] = []:
+	get: return texture_settings.duplicate()
+	set(v):
+		texture_settings = v
+		for setting in texture_settings:
+			setting.changed.connect(emit_changed)
+		emit_changed()
+
+func _get_draw_rect(rect : Rect2) -> Rect2:
+	var combined_rect : Rect2 = Rect2()
+	for setting in texture_settings:
+		if combined_rect.position.x > setting.expand_margin_left:
+			combined_rect.position.x = setting.expand_margin_left
+		if combined_rect.position.y > setting.expand_margin_top:
+			combined_rect.position.y = setting.expand_margin_top
+		if combined_rect.end.x < setting.expand_margin_right:
+			combined_rect.end.x = setting.expand_margin_right
+		if combined_rect.end.y < setting.expand_margin_bottom:
+			combined_rect.end.y = setting.expand_margin_bottom
+	return rect.grow_individual(combined_rect.position.x, combined_rect.position.y, combined_rect.end.x, combined_rect.end.y)
+
+func _draw(to_canvas_item : RID, rect : Rect2) -> void:
+	for setting in texture_settings:
+		if setting == null or setting.texture == null:
+			continue
+		var inner_rect : Rect2 = rect
+		inner_rect.position.x -= setting.expand_margin_left
+		inner_rect.position.y -= setting.expand_margin_top
+		inner_rect.size.x += setting.expand_margin_left + setting.expand_margin_right
+		inner_rect.size.y += setting.expand_margin_top + setting.expand_margin_bottom
+		RenderingServer.canvas_item_add_nine_patch(
+			to_canvas_item,
+			inner_rect,
+			setting.region_rect,
+			setting.texture.get_rid(),
+			Vector2(setting.texture_margin_left, setting.texture_margin_top),
+			Vector2(setting.texture_margin_right, setting.texture_margin_bottom),
+			setting.axis_stretch_horizontal,
+			setting.axis_stretch_vertical,
+			setting.draw_center,
+			setting.modulate_color
+		)
diff --git a/game/src/Utility/TextureSetting.gd b/game/src/Utility/TextureSetting.gd
new file mode 100644
index 0000000..da9b185
--- /dev/null
+++ b/game/src/Utility/TextureSetting.gd
@@ -0,0 +1,123 @@
+extends Resource
+class_name TextureSetting
+
+@export
+var texture : Texture2D:
+	get: return texture
+	set(v):
+		texture = v
+		emit_changed()
+@export
+var draw_center : bool = true:
+	get: return draw_center
+	set(v):
+		draw_center = v
+		emit_changed()
+
+@export_group("Texture Margins", "texture_margin_")
+@export
+var texture_margin_left : float = 0:
+	get: return texture_margin_left
+	set(v):
+		texture_margin_left = v
+		emit_changed()
+@export
+var texture_margin_top : float = 0:
+	get: return texture_margin_top
+	set(v):
+		texture_margin_top = v
+		emit_changed()
+@export
+var texture_margin_right : float = 0:
+	get: return texture_margin_right
+	set(v):
+		texture_margin_right = v
+		emit_changed()
+@export
+var texture_margin_bottom : float = 0:
+	get: return texture_margin_bottom
+	set(v):
+		texture_margin_bottom = v
+		emit_changed()
+
+@export_group("Expand Margins", "expand_margin_")
+@export
+var expand_margin_left : float = 0:
+	get: return expand_margin_left
+	set(v):
+		expand_margin_left = v
+		emit_changed()
+@export
+var expand_margin_top : float = 0:
+	get: return expand_margin_top
+	set(v):
+		expand_margin_top = v
+		emit_changed()
+@export
+var expand_margin_right : float = 0:
+	get: return expand_margin_right
+	set(v):
+		expand_margin_right = v
+		emit_changed()
+@export
+var expand_margin_bottom : float = 0:
+	get: return expand_margin_bottom
+	set(v):
+		expand_margin_bottom = v
+		emit_changed()
+
+@export_group("Axis Stretch", "axis_stretch_")
+@export
+var axis_stretch_horizontal : RenderingServer.NinePatchAxisMode = RenderingServer.NINE_PATCH_STRETCH:
+	get: return axis_stretch_horizontal
+	set(v):
+		axis_stretch_horizontal = v
+		emit_changed()
+@export
+var axis_stretch_vertical : RenderingServer.NinePatchAxisMode = RenderingServer.NINE_PATCH_STRETCH:
+	get: return axis_stretch_vertical
+	set(v):
+		axis_stretch_vertical = v
+		emit_changed()
+
+@export_group("Sub-Region", "region_")
+@export
+var region_rect : Rect2 = Rect2(0, 0, 0, 0):
+	get: return region_rect
+	set(v):
+		region_rect = v
+		emit_changed()
+
+@export_group("Modulate", "modulate_")
+@export
+var modulate_color : Color = Color(1, 1, 1, 1):
+	get: return modulate_color
+	set(v):
+		modulate_color = v
+		emit_changed()
+
+@export_group("Content Margins", "content_margin_")
+@export
+var content_margin_left : float = -1:
+	get: return content_margin_left
+	set(v):
+		content_margin_left = v
+		emit_changed()
+@export
+var content_margin_top : float = -1:
+	get: return content_margin_top
+	set(v):
+		content_margin_top = v
+		emit_changed()
+@export
+var content_margin_right : float = -1:
+	get: return content_margin_right
+	set(v):
+		content_margin_right = v
+		emit_changed()
+@export
+var content_margin_bottom : float = -1:
+	get: return content_margin_bottom
+	set(v):
+		content_margin_bottom = v
+		emit_changed()