159 lines
4.9 KiB
Plaintext
159 lines
4.9 KiB
Plaintext
---
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id: customize_text_messages
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sidebar_position: 6
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title: Customize Text Messages
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---
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Customizing Text Messages
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### Introduction
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Every application provides a unique look and feel to their own messaging interface including and not
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limited to fonts, colors, and shapes.
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This guide details how to customize message text in the `MessageListView` / `MessageWidget` in the
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Stream Chat Flutter UI SDK.
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:::note
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This guide is specifically for the `MessageListView` but if you intend to display a `MessageWidget`
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separately, follow the same process without the `.copyWith` and use the default constructor instead.
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:::
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### Basics of customizing a `MessageWidget`
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First, add a `MessageListView` in the appropriate place where you intend to display messages from a
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channel.
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```dart
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MessageListView(
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...
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)
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```
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Now, we use the `messageBuilder` parameter to build a custom message. The builder function also provides
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the default implementation of the `MessageWidget` so that we can change certain aspects of the widget
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without redoing all of the default parameters.
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:::note
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In earlier versions of the SDK, some `MessageWidget` parameters were exposed directly through the `MessageListView`,
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however, this quickly becomes hard to maintain as more parameters and customizations are added to the
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`MessageWidget`. Newer version utilise a cleaner interface to change the parameters by supplying a
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default message implementation as aforementioned.
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:::
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```dart
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MessageListView(
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...
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messageBuilder: (context, messageDetails, messageList, defaultWidget) {
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return defaultWidget;
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},
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)
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```
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We use `.copyWith()` to customize the widget:
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```dart
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MessageListView(
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...
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messageBuilder: (context, messageDetails, messageList, defaultWidget) {
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return defaultWidget.copyWith(
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...
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);
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},
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)
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```
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### Customizing text
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If you intend to simply change the theme for the text, you need not recreate the whole widget. The
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`MessageWidget` has a `messageTheme` parameter that allows you to pass the theme for most aspects
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of the message.
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```dart
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MessageListView(
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...
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messageBuilder: (context, messageDetails, messageList, defaultWidget) {
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return defaultWidget.copyWith(
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messageTheme: MessageTheme(
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...
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messageText: TextStyle(),
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),
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);
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},
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)
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```
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If you want to replace the entire text widget in the `MessageWidget`, you can use the `textBuilder`
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parameter which provides a builder for creating a widget to substitute the default text.parameter
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```dart
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MessageListView(
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...
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messageBuilder: (context, messageDetails, messageList, defaultWidget) {
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return defaultWidget.copyWith(
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textBuilder: (context, message) {
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return Text(message.text);
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},
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);
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},
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)
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```
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### Adding Hashtags
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To add elements like hashtags, we can override the `textBuilder` in the MessageWidget:
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```dart
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MessageListView(
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...
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messageBuilder: (context, messageDetails, messageList, defaultWidget) {
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return defaultWidget.copyWith(
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textBuilder: (context, message) {
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final text = _replaceHashtags(message.text).replaceAll('\n', '\\\n');
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final messageTheme = StreamChatTheme.of(context).ownMessageTheme;
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return MarkdownBody(
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data: text,
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onTapLink: (
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String link,
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String href,
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String title,
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) {
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// Do something with tapped hashtag
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},
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styleSheet: MarkdownStyleSheet.fromTheme(
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Theme.of(context).copyWith(
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textTheme: Theme.of(context).textTheme.apply(
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bodyColor: messageTheme.messageText.color,
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decoration: messageTheme.messageText.decoration,
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decorationColor: messageTheme.messageText.decorationColor,
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decorationStyle: messageTheme.messageText.decorationStyle,
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fontFamily: messageTheme.messageText.fontFamily,
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),
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),
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).copyWith(
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a: messageTheme.messageLinks,
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p: messageTheme.messageText,
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),
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);
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},
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);
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},
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)
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String _replaceHashtags(String text) {
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RegExp exp = new RegExp(r"\B#\w\w+");
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exp.allMatches(text).forEach((match){
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text = text.replaceAll(
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'${match.group(0)}', '[${match.group(0)}](${match.group(0).replaceAll(' ', '')})');
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});
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return text;
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}
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```
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We can replace the hashtags using RegEx and add links for the MarkdownBody which is done here in the
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`_replaceHashtags()` function.
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Inside the textBuilder, we use the `flutter_markdown` package to build our hashtags as links.
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