Enum gtk4::PolicyType

source ·
#[non_exhaustive]
pub enum PolicyType {
    Always,
    Automatic,
    Never,
    External,
    // some variants omitted
}
Expand description

Determines how the size should be computed to achieve the one of the visibility mode for the scrollbars.

Variants (Non-exhaustive)§

This enum is marked as non-exhaustive
Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.
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Always

The scrollbar is always visible. The view size is independent of the content.

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Automatic

The scrollbar will appear and disappear as necessary. For example, when all of a TreeView can not be seen.

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Never

The scrollbar should never appear. In this mode the content determines the size.

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External

Don’t show a scrollbar, but don’t force the size to follow the content. This can be used e.g. to make multiple scrolled windows share a scrollbar.

Trait Implementations§

Returns a copy of the value. Read more
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Formats the value using the given formatter. Read more
Formats the value using the given formatter. Read more
Value type checker.
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Feeds this value into the given Hasher. Read more
Feeds a slice of this type into the given Hasher. Read more
This method returns an Ordering between self and other. Read more
Compares and returns the maximum of two values. Read more
Compares and returns the minimum of two values. Read more
Restrict a value to a certain interval. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
This method returns an ordering between self and other values if one exists. Read more
This method tests less than (for self and other) and is used by the < operator. Read more
This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
This method tests greater than (for self and other) and is used by the > operator. Read more
This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
Returns the type identifier of Self.
Convert a value to a Value.
Returns the type identifer of self. Read more
Type to get the Type from. Read more

Auto Trait Implementations§

Blanket Implementations§

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.