Function gdk::pango_layout_line_get_clip_region [−][src]
pub fn pango_layout_line_get_clip_region(
line: &LayoutLine,
x_origin: i32,
y_origin: i32,
index_ranges: &[GRange]
) -> Option<Region>
Expand description
Obtains a clip region which contains the areas where the given
ranges of text would be drawn. x_origin and y_origin are the top left
position of the layout. index_ranges
should contain ranges of bytes in the layout’s text. The clip
region will include space to the left or right of the line (to the
layout bounding box) if you have indexes above or below the indexes
contained inside the line. This is to draw the selection all the way
to the side of the layout. However, the clip region is in line coordinates,
not layout coordinates.
Note that the regions returned correspond to logical extents of the text ranges, not ink extents. So the drawn line may in fact touch areas out of the clip region. The clip region is mainly useful for highlightling parts of text, such as when text is selected.
line
x_origin
X pixel where you intend to draw the layout line with this clip
y_origin
baseline pixel where you intend to draw the layout line with this clip
index_ranges
array of byte indexes into the layout, where even members of array are start indexes and odd elements are end indexes
n_ranges
number of ranges in index_ranges, i.e. half the size of index_ranges
Returns
a clip region containing the given ranges