# feature:
## In Browser:
- hidden back&forward button in sidebar.
- back and forward is equal with `window.history.back()` `window.history.forward()`
## In Desktop:
- Back and forward can be controlled through the sidebar, cmdk, and shortcut keys.
- back and forward act on the currently **active** view.
- buttons change disable&enable style based on current active view history
# Refactor:
Move app-sidebar and app-container from @affine/component to @affine/core
## **User description**
use react-transition-state to simplify exit animation
___
## **Type**
enhancement
___
## **Description**
- Integrated `react-transition-state` for managing animations in `ResizePanel` and `CMDKModal` components, simplifying the code and improving maintainability.
- Introduced a shared animation timeout variable to standardize animation durations across components.
- Added `react-transition-state` to dependencies to enable the new animation handling.
___
## **Changes walkthrough**
<table><thead><tr><th></th><th align="left">Relevant files</th></tr></thead><tbody><tr><td><strong>Enhancement</strong></td><td><table>
<tr>
<td>
<details>
<summary><strong>resize-panel.tsx</strong><dd><code>Integrate `react-transition-state` for Resize Panel Animations</code></dd></summary>
<hr>
packages/frontend/component/src/components/resize-panel/resize-panel.tsx
<li>Introduced <code>useTransition</code> hook from <code>react-transition-state</code> for managing <br>animations.<br> <li> Added a constant for animation timeout and applied it to the <br>transition.<br> <li> Utilized the transition state to toggle the open state of the resize <br>panel.<br>
</details>
</td>
<td><a href="https:/toeverything/AFFiNE/pull/5923/files#diff-a4d6e633862f63f97c167ff41ba62aff8aebf3e3b2f6e7ce13d5a0e22e8ff287">+12/-0</a> </td>
</tr>
<tr>
<td>
<details>
<summary><strong>modal.css.ts</strong><dd><code>Use Variable for Animation Timeout in Modal CSS</code> </dd></summary>
<hr>
packages/frontend/core/src/components/pure/cmdk/modal.css.ts
<li>Created a variable for animation timeout.<br> <li> Updated animation durations to use the new timeout variable.<br>
</details>
</td>
<td><a href="https:/toeverything/AFFiNE/pull/5923/files#diff-ba8935611b9c1695153d92d08ecb0f7dac73a6197f54ccda5a6e791902cd651d">+6/-3</a> </td>
</tr>
<tr>
<td>
<details>
<summary><strong>modal.tsx</strong><dd><code>Simplify CMDK Modal Animation with `react-transition-state`</code></dd></summary>
<hr>
packages/frontend/core/src/components/pure/cmdk/modal.tsx
<li>Replaced custom animation state management with <code>useTransition</code> hook.<br> <li> Removed old animation state logic and simplified the component.<br> <li> Added animation timeout variable and applied it to the transition.<br>
</details>
</td>
<td><a href="https:/toeverything/AFFiNE/pull/5923/files#diff-ab3fe66c9b1d3a691fafd1aebc9988e840fedfcd09b5b89570838a5a2a9469c9">+13/-33</a> </td>
</tr>
</table></td></tr><tr><td><strong>Dependencies</strong></td><td><table>
<tr>
<td>
<details>
<summary><strong>package.json</strong><dd><code>Add `react-transition-state` Dependency</code> </dd></summary>
<hr>
packages/frontend/core/package.json
- Added `react-transition-state` as a dependency.
</details>
</td>
<td><a href="https:/toeverything/AFFiNE/pull/5923/files#diff-23e0e5dc0ceb004a0a5d3d13e7d00545de7487535ca0e5eab4c5047f1e24eff0">+1/-0</a> </td>
</tr>
</table></td></tr></tr></tbody></table>
___
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pengx17
