text stringlengths 1 372 |
|---|
), |
); |
} |
} |
<code_end> |
by setting softWrap to true, text lines fill the column width before |
wrapping at a word boundary. |
<topic_end> |
<topic_start> |
update the app to display the text section |
add a new TextSection widget as a child after the ButtonSection. |
when adding the TextSection widget, set its description property to |
the text of the location description. |
<topic_end> |
<topic_start> |
add the image section |
in this section, add the image file to complete your layout. |
<topic_end> |
<topic_start> |
configure your app to use supplied images |
to configure your app to reference images, modify its pubspec.yaml file. |
create an images directory at the top of the project. |
download the lake.jpg image and add it to the new images directory. |
info |
you can’t use wget to save this binary file. |
you can download the image from unsplash |
under the unsplash license. the small size comes in at 94.4 kB. |
to include images, add an assets tag to the pubspec.yaml file |
at the root directory of your app. |
when you add assets, it serves as the set of pointers to the images |
available to your code. |
lightbulb tip |
text in the pubspec.yaml respects whitespace and text case. |
write the changes to the file as given in the previous example. |
this change might require you to restart the running program to |
display the image. |
<topic_end> |
<topic_start> |
create the ImageSection widget |
define the following ImageSection widget after the other declarations. |
<code_start> |
class ImageSection extends StatelessWidget { |
const ImageSection({super.key, required this.image}); |
final string image; |
@override |
widget build(BuildContext context) { |
return image.asset( |
image, |
width: 600, |
height: 240, |
fit: BoxFit.cover, |
); |
} |
} |
<code_end> |
the BoxFit.cover value tells flutter to display the image with |
two constraints. first, display the image as small as possible. |
second, cover all the space that the layout allotted, called the render box. |
<topic_end> |
<topic_start> |
update the app to display the image section |
add an ImageSection widget as the first child in the children list. |
set the image property to the path of the image you added in |
configure your app to use supplied images. |
<topic_end> |
<topic_start> |
congratulations |
that’s it! when you hot reload the app, your app should look like this. |
<topic_end> |
<topic_start> |
resources |
you can access the resources used in this tutorial from these locations: |
dart code: main.dart |
image: ch-photo |
pubspec: pubspec.yaml |
<topic_end> |
<topic_start> |
next steps |
to add interactivity to this layout, follow the |
interactivity tutorial. |
<topic_end> |
<topic_start> |
lists & grids |
<topic_end> |
<topic_start> |
topics |
<topic_end> |
<topic_start> |
use lists |
displaying lists of data is a fundamental pattern for mobile apps. |
flutter includes the ListView |
widget to make working with lists a breeze. |
<topic_end> |
<topic_start> |
create a ListView |
using the standard ListView constructor is |
perfect for lists that contain only a few items. |
the built-in ListTile |
widget is a way to give items a visual structure. |
<code_start> |
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