Struct pango::LayoutLine

pub struct LayoutLine(_);

The LayoutLine structure represents one of the lines resulting from laying out a paragraph via Layout. LayoutLine structures are obtained by calling Layout::line() and are only valid until the text, attributes, or settings of the parent Layout are modified.

Routines for rendering PangoLayout objects are provided in code specific to each rendering system.

Implementations

impl LayoutLine

pub fn extents(&self) -> (Rectangle, Rectangle)

Computes the logical and ink extents of a layout line. See FontExt::glyph_extents() for details about the interpretation of the rectangles.

Returns

ink_rect

rectangle used to store the extents of the glyph string as drawn, or None

logical_rect

rectangle used to store the logical extents of the glyph string, or None

pub fn height(&self) -> i32

This is supported on crate feature v1_44 only.

Computes the height of the line, ie the distance between this and the previous lines baseline.

Returns

height

return location for the line height

pub fn pixel_extents(&self) -> (Rectangle, Rectangle)

Computes the logical and ink extents of self in device units. This function just calls extents() followed by two extents_to_pixels() calls, rounding ink_rect and logical_rect such that the rounded rectangles fully contain the unrounded one (that is, passes them as first argument to extents_to_pixels()).

Returns

ink_rect

rectangle used to store the extents of the glyph string as drawn, or None

logical_rect

rectangle used to store the logical extents of the glyph string, or None

pub fn x_ranges(&self, start_index: i32, end_index: i32) -> Vec<i32>

Gets a list of visual ranges corresponding to a given logical range. This list is not necessarily minimal - there may be consecutive ranges which are adjacent. The ranges will be sorted from left to right. The ranges are with respect to the left edge of the entire layout, not with respect to the line.

start_index

Start byte index of the logical range. If this value is less than the start index for the line, then the first range will extend all the way to the leading edge of the layout. Otherwise it will start at the leading edge of the first character.

end_index

Ending byte index of the logical range. If this value is greater than the end index for the line, then the last range will extend all the way to the trailing edge of the layout. Otherwise, it will end at the trailing edge of the last character.

Returns

ranges

location to store a pointer to an array of ranges. The array will be of length <literal>2*n_ranges</literal>, with each range starting at <literal>(ranges)[2n]</literal> and of width <literal>(ranges)[2n + 1] - (ranges)[2n]</literal>. This array must be freed with g_free(). The coordinates are relative to the layout and are in Pango units.

pub fn index_to_x(&self, index_: i32, trailing: bool) -> i32

Converts an index within a line to a X position.

index_

byte offset of a grapheme within the layout

trailing

an integer indicating the edge of the grapheme to retrieve the position of. If > 0, the trailing edge of the grapheme, if 0, the leading of the grapheme.

Returns

x_pos

location to store the x_offset (in Pango unit)

impl LayoutLine

pub fn start_index(&self) -> i32

The byte index of the start of this line into the text used to create the source Layout.

pub fn length(&self) -> i32

The length of this line’s text, in bytes.

pub fn x_to_index(&self, x_pos: i32) -> HitPosition

Converts from x offset to the byte index of the corresponding character within the text of the layout. If x_pos is outside the line, index_ and trailing will point to the very first or very last position in the line. This determination is based on the resolved direction of the paragraph; for example, if the resolved direction is right-to-left, then an X position to the right of the line (after it) results in 0 being stored in index_ and trailing. An X position to the left of the line results in index_ pointing to the (logical) last grapheme in the line and trailing being set to the number of characters in that grapheme. The reverse is true for a left-to-right line.

x_pos

the X offset (in Pango units) from the left edge of the line.

Returns

false if x_pos was outside the line, true if inside

index_

location to store calculated byte index for the grapheme in which the user clicked.

trailing

location to store an integer indicating where in the grapheme the user clicked. It will either be zero, or the number of characters in the grapheme. 0 represents the leading edge of the grapheme.

Trait Implementations

impl Clone for LayoutLine

fn clone(&self) -> LayoutLine

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for LayoutLine

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Hash for LayoutLine

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl Ord for LayoutLine

fn cmp(&self, other: &LayoutLine) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<LayoutLine> for LayoutLine

fn eq(&self, other: &LayoutLine) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &LayoutLine) -> bool

This method tests for !=.

impl PartialOrd<LayoutLine> for LayoutLine

fn partial_cmp(&self, other: &LayoutLine) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl StaticType for LayoutLine

fn static_type() -> Type

Returns the type identifier of Self.

impl Eq for LayoutLine

impl StructuralEq for LayoutLine

impl StructuralPartialEq for LayoutLine