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LibWeb: Add an "undefined" state to Length

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A default-constructed Length now gives you an undefined length value,
which can be used to signify the absence of a value.
This commit is contained in:
Andreas Kling 2020-06-24 11:24:00 +02:00
parent f742b245b7
commit 90edaabc4b
2 changed files with 7 additions and 1 deletions
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2
Libraries/LibWeb/CSS/Length.cpp
View file

@ -53,6 +53,8 @@ const char* Length::unit_name() const
return "rem";
case Type::Auto:
return "auto";
case Type::Undefined:
return "undefined";
}
ASSERT_NOT_REACHED();
}

6
Libraries/LibWeb/CSS/Length.h
View file

@ -34,12 +34,14 @@ namespace Web {
class Length {
public:
enum class Type {
Undefined,
Auto,
Px,
Em,
Rem,
};
Length() { }
Length(int value, Type type)
: m_type(type)
, m_value(value)
@ -54,6 +56,7 @@ public:
static Length make_auto() { return Length(0, Type::Auto); }
static Length make_px(float value) { return Length(value, Type::Px); }
bool is_undefined() const { return m_type == Type::Undefined; }
bool is_auto() const { return m_type == Type::Auto; }
bool is_absolute() const { return m_type == Type::Px; }
bool is_relative() const { return m_type == Type::Em || m_type == Type::Rem; }
@ -68,6 +71,7 @@ public:
return 0;
case Type::Px:
return m_value;
case Type::Undefined:
default:
ASSERT_NOT_REACHED();
}
@ -85,7 +89,7 @@ private:
const char* unit_name() const;
Type m_type { Type::Auto };
Type m_type { Type::Undefined };
float m_value { 0 };
};