Fix avatar image flickering on first load

[flang]

Close #44

Summary by CodeRabbit

• Bug Fixes

  • Improved avatar display by ensuring its size is set after it has been added to the chat window, enhancing visual consistency.

• Chores

  • Updated the version number of the chat assistant add-on.

[coderabbitai]

Walkthrough

The pull request updates the artifact version in pom.xml from 3.0.0-SNAPSHOT to 3.0.1-SNAPSHOT and modifies the ChatAssistant.java file to defer the avatar.setSizeFull() call until after the avatar element is appended and the chat window target is set, adjusting the timing of avatar sizing.

Changes

Cohort / File(s)	Change Summary
Version Update pom.xml	Updated chat-assistant-addon artifact version from 3.0.0-SNAPSHOT to 3.0.1-SNAPSHOT.
Avatar Sizing Timing src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java	Moved avatar.setSizeFull() into the JavaScript execution callback to defer sizing until after DOM manipulation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Assessment against linked issues

Objective	Addressed	Explanation
Prevent avatar flickering by avoiding initial full-size rendering (#44)	✅

Assessment against linked issues: Out-of-scope changes

No out-of-scope changes found.

Possibly related PRs

• Replace wc-chatbot with react and vaadin components #35: Refactors and introduces the React and Vaadin component-based ChatAssistant implementation, which this PR further refines by adjusting avatar sizing timing.

Suggested labels

enhancement

Suggested reviewers

• javier-godoy

Note

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📜 Recent review details

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Review profile: CHILL
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📥 Commits

Reviewing files that changed from the base of the PR and between 7050631 and d9b8c49.

📒 Files selected for processing (2)

• pom.xml (1 hunks)
• src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java (1 hunks)

🧰 Additional context used

🧠 Learnings (6)

📓 Common learnings

Learnt from: mlopezFC
PR: FlowingCode/ChatAssistant#35
File: src/main/resources/META-INF/frontend/react/animated-fab.tsx:0-0
Timestamp: 2025-07-24T13:41:19.117Z
Learning: In the ChatAssistant animated-fab React component (src/main/resources/META-INF/frontend/react/animated-fab.tsx), the Floating Action Button (FAB) appears empty in the React code but gets its icon content from the Avatar Vaadin component, which is inserted via DOM manipulation from the Java backend's initializeAvatar method.

Learnt from: mlopezFC
PR: FlowingCode/ChatAssistant#35
File: src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java:179-186
Timestamp: 2025-07-24T13:40:40.471Z
Learning: In ChatAssistant's initializeAvatar method (src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java), direct DOM manipulation using executeJs is intentionally used to move the Avatar component to be a child of a button that is inside a div within the React-controlled web component structure. This approach is necessary because the target elements are created by React, and standard Vaadin component hierarchy methods cannot be used due to ReactAdapterComponent limitations.

Learnt from: mlopezFC
PR: FlowingCode/ChatAssistant#35
File: src/main/resources/META-INF/frontend/styles/chat-assistant-styles.css:20-28
Timestamp: 2025-07-22T20:00:43.518Z
Learning: In ChatAssistant's CSS (src/main/resources/META-INF/frontend/styles/chat-assistant-styles.css), the double 180-degree rotation trick on both .chat-assistant-resizable-vertical-layout and .chat-assistant-container-vertical-layout is used to move the resize handle from the default bottom-right corner to the upper-left corner. This positioning is more suitable for resizing the chat window since the chat bubble is positioned in the bottom-right part of the viewport.

📚 Learning: in chatassistant's initializeavatar method (src/main/java/com/flowingcode/vaadin/addons/chatassistan...

Learnt from: mlopezFC
PR: FlowingCode/ChatAssistant#35
File: src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java:179-186
Timestamp: 2025-07-24T13:40:40.471Z
Learning: In ChatAssistant's initializeAvatar method (src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java), direct DOM manipulation using executeJs is intentionally used to move the Avatar component to be a child of a button that is inside a div within the React-controlled web component structure. This approach is necessary because the target elements are created by React, and standard Vaadin component hierarchy methods cannot be used due to ReactAdapterComponent limitations.

Applied to files:

• pom.xml
• src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java

📚 Learning: in `src/main/java/com/flowingcode/vaadin/addons/chatassistant/chatassistant.java`, the parameter `po...

Learnt from: paodb
PR: FlowingCode/ChatAssistant#31
File: pom.xml:317-317
Timestamp: 2024-11-11T17:49:24.845Z
Learning: In `src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java`, the parameter `position` in the method `scrollToIndex(int position)` is properly documented at line 328.

Applied to files:

• pom.xml
• src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java

📚 Learning: in the chatassistant animated-fab react component (src/main/resources/meta-inf/frontend/react/animat...

Learnt from: mlopezFC
PR: FlowingCode/ChatAssistant#35
File: src/main/resources/META-INF/frontend/react/animated-fab.tsx:0-0
Timestamp: 2025-07-24T13:41:19.117Z
Learning: In the ChatAssistant animated-fab React component (src/main/resources/META-INF/frontend/react/animated-fab.tsx), the Floating Action Button (FAB) appears empty in the React code but gets its icon content from the Avatar Vaadin component, which is inserted via DOM manipulation from the Java backend's initializeAvatar method.

Applied to files:

• pom.xml
• src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java

📚 Learning: in chatassistant's css (src/main/resources/meta-inf/frontend/styles/chat-assistant-styles.css), the ...

Learnt from: mlopezFC
PR: FlowingCode/ChatAssistant#35
File: src/main/resources/META-INF/frontend/styles/chat-assistant-styles.css:20-28
Timestamp: 2025-07-22T20:00:43.518Z
Learning: In ChatAssistant's CSS (src/main/resources/META-INF/frontend/styles/chat-assistant-styles.css), the double 180-degree rotation trick on both .chat-assistant-resizable-vertical-layout and .chat-assistant-container-vertical-layout is used to move the resize handle from the default bottom-right corner to the upper-left corner. This positioning is more suitable for resizing the chat window since the chat bubble is positioned in the bottom-right part of the viewport.

Applied to files:

• src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java

📚 Learning: when using reactadaptercomponent with custom react components in chatassistant, standard vaadin comp...

Learnt from: mlopezFC
PR: FlowingCode/ChatAssistant#35
File: src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java:179-186
Timestamp: 2025-07-22T19:52:28.019Z
Learning: When using ReactAdapterComponent with custom React components in ChatAssistant, standard Vaadin component hierarchy methods like add() cannot be used because the component doesn't implement HasComponents, and the DOM structure is controlled by React. Direct DOM manipulation with executeJs may be necessary to integrate Vaadin components (like Avatar) into React-generated DOM structures.

Applied to files:

• src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java

🔇 Additional comments (2)

pom.xml (1)

7-7: LGTM! Appropriate version increment for bug fix.

The patch version increment from 3.0.0-SNAPSHOT to 3.0.1-SNAPSHOT correctly follows semantic versioning conventions for a bug fix addressing the avatar flickering issue.

src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatAssistant.java (1)

192-195: Excellent fix for the avatar flickering issue!

Moving avatar.setSizeFull() into the nested callback ensures proper timing by deferring the size setting until after:

1. The avatar element is appended to the DOM
2. DOM manipulation repositions the avatar correctly
3. The chat window target is assigned

This eliminates the flickering effect that occurred when large avatars were resized before being properly positioned in the DOM structure.

✨ Finishing Touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch issue-44

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[mlopezFC]

Please remove the version change commit, given that we didn't release the 3.0.0 version yet.

[mlopezFC]

LGTM