Function CheckBoxAt

Siv3D/src/Siv3D/SimpleGUI/SivSimpleGUI.cpp:422–480

		}

		bool CheckBoxAt(bool& checked, const StringView label, const Vec2& center, const Optional<double>& _width, const bool enabled)
		{
			const Font& font = GetFont();
			const DrawableText dtext = font(label);

			const double width = _width.value_or_eval([&](){ return Math::Ceil(CheckBoxPadding * 3 + CheckBoxSize + dtext.region().w); });
			const RectF region{ Arg::center = center, width, UnitSize };
			const RectF checkBox{ Arg::leftCenter(region.x + 8, center.y), CheckBoxSize };
			const RoundRect roundCheckBox = checkBox.rounded(3.2);
			const Vec2 labelPos{ (region.x + CheckBoxPadding * 2 + CheckBoxSize), (center.y - font.height() / 2.0 + FontYOffset) };
			const bool mouseOver = (enabled && checkBox.mouseOver());

			region.draw(BackgroundColor);

			if (checked)
			{
				if (enabled)
				{
					roundCheckBox.draw(mouseOver ? CheckBoxHighlightedFillColor : CheckBoxFillColor);
				}
				else
				{
					roundCheckBox.draw(CheckBoxDisabledFillColor);
				}

				DrawCheck(checkBox.center());
			}
			else
			{
				const RoundRect innerRoundRect = checkBox.stretched(-1.25).rounded(3.2);

				if (enabled)
				{
					roundCheckBox.draw(CheckBoxBaseColor);
					innerRoundRect.draw(mouseOver ? CheckBoxMouseOverColor : ColorF{ 0.95 });
				}
				else
				{
					roundCheckBox.draw(CheckBoxDisabledBaseColor);
					innerRoundRect.draw(ColorF{ 0.8 });
				}
			}

			dtext.draw(labelPos, GetTextColor(enabled));

			if (enabled && Cursor::OnClientRect() && checkBox.mouseOver())
			{
				Cursor::RequestStyle(CursorStyle::Hand);
			}

			const bool previousValue = checked;

			if (enabled && Cursor::OnClientRect() && checkBox.leftClicked())
			{
				checked = !checked;
			}

			return (checked != previousValue);