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TextLineBounds Enum

  • Reference

Definition

Namespace:
Microsoft.UI.Xaml
Edit

Influences how a line box height is calculated

public enum class TextLineBounds
/// [Windows.Foundation.Metadata.ContractVersion(Microsoft.UI.Xaml.WinUIContract, 65536)]
enum class TextLineBounds
[Windows.Foundation.Metadata.ContractVersion(typeof(Microsoft.UI.Xaml.WinUIContract), 65536)]
public enum TextLineBounds
Public Enum TextLineBounds
Inheritance
Enum
TextLineBounds
Attributes
ContractVersionAttribute

Fields

Name Value Description
Full 0

Uses normal line box height calculation, this is the default.
TrimToCapHeight 1

Top of line box height is the cap height from the font.
TrimToBaseline 2

Bottom of line box height is the text baseline.
Tight 3

Top of line box height is the cap height from the font, bottom of line box height is the text baseline.

Remarks

How the TextLineBounds values influence line height calculations for adjacent lines is best shown through illustrations. The first illustration for each value shows a single line and the second shows two adjacent lines and their bounds.

  • Yellow areas represent the areas that are outside of a TextBlock outer boundary, and would thus be masked if there was adjacent content (text or otherwise).
  • The red line is the text cap height, which text ascenders might go above. The upper-case "Â" character in the illustrations has an ascender.
  • The green line is the text baseline, which text descenders might go below. The lower-case "j" character in the illustrations has a descender.

Full

Illustration of the Full value for TextLineBounds applied to a line of text, with baseline and cap height indicated.Illustration of the Full value for TextLineBounds applied to two lines of text, showing the spacing between the lines.

TrimToCapHeight

Illustration of the TrimToCapHeight value for TextLineBounds applied to a line of text, with baseline and cap height indicatedIllustration of the TrimToCapHeight value for TextLineBounds applied to two lines of text, showing the spacing between the lines.

TrimToBaseline

Illustration of the TrimToBaseline value for TextLineBounds applied to a line of text, with baseline and cap height indicatedIllustration of the TrimToBaseline value for TextLineBounds applied to two lines of text, showing the spacing between the lines.

Tight

Illustration of the Tight value for TextLineBounds applied to a line of text, with baseline and cap height indicatedIllustration of the Tight value for TextLineBounds applied to two lines of text, showing the spacing between the lines.

Note that for the Tight alignment there is a strong possibility that characters are overlapped if there are any ascenders or descenders. Especially if the different lines of characters use the same Foreground value, the overlap can negatively impact readability.

Applies to