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code before migration:
code after migration:
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components
some components couldn’t merely be updated to match the material 3 design spec
but needed a whole new implementation. such components require manual migration
since the flutter SDK doesn’t know what, exactly, you want.
replace the material 2 style BottomNavigationBar widget with the new
NavigationBar widget. it’s slightly taller, contains pill-shaped
navigation indicators, and uses new color mappings.
code before migration:
code after migration:
check out the complete sample on
migrating from BottomNavigationBar to NavigationBar.
replace the drawer widget with NavigationDrawer, which provides
pill-shaped navigation indicators, rounded corners, and new color mappings.
code before migration:
code after migration:
check out the complete sample on migrating from drawer to NavigationDrawer.
material 3 introduces medium and large app bars that display a larger headline
before scrolling. instead of a drop shadow, ColorScheme.surfaceTint color
is used create a separation from the content when scrolling.
the following code demonstrates how to implement the medium app bar:
there are now two types of TabBar widgets: primary and secondary.
secondary tabs are used within a content area to further separate
related content and establish hierarchy. check out the TabBar.secondary
example.
the new TabBar.tabAlignment property specifies the horizontal alignment
of the tabs.
the following sample shows how to modify tab alignment in a scrollable TabBar:
SegmentedButton, an updated version of ToggleButtons,
uses fully rounded corners, differs in layout height and
size, and uses a dart set to determine selected items.
code before migration:
code after migration:
check out the complete sample on
migrating from ToggleButtons to SegmentedButton.
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new components
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timeline
in stable release: 3.16
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references
documentation:
API documentation:
relevant issues:
relevant PRs:
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text
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topics
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flutter's fonts and typography
typography covers the style and appearance of
type or fonts: it specifies how heavy the font is,
the slant of the font, the spacing between
the letters, and other visual aspects of the text.
all fonts are not created the same. fonts are a huge
topic and beyond the scope of this site, however,
this page discusses flutter’s support for variable
and static fonts.
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variable fonts
variable fonts (also called OpenType fonts),
allow you to control pre-defined aspects of text styling.
variable fonts support specific axes, such as width,
weight, slant (to name a few).
the user can select any value along the continuous axis
when specifying the type.
however, the font must first define what axes are available,
and that isn’t always easy to figure out. if you are using
a google font, you can learn what axes are available using
the type tester feature, described in the next section.
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using the google fonts type tester
the google fonts site offers both variable and static fonts.
use the type tester to learn more about its variable fonts.
in real time, move the slider on any of the axes to
see how it affects the font. when programming a variable font,
use the FontVariation class to modify the font’s design axes.
the FontVariation class conforms to the
OpenType font variables spec.
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static fonts
google fonts also contains static fonts. as with variable fonts,
you need to know how the font is designed to know what options
are available to you.
once again, the google fonts site can help.
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