diff --git a/client/src/javascript/components/modals/torrent-details-modal/TorrentContents.tsx b/client/src/javascript/components/modals/torrent-details-modal/TorrentContents.tsx
index c0f10328..ff764d2d 100644
--- a/client/src/javascript/components/modals/torrent-details-modal/TorrentContents.tsx
+++ b/client/src/javascript/components/modals/torrent-details-modal/TorrentContents.tsx
@@ -1,8 +1,7 @@
-import {observable, runInAction} from 'mobx';
 import classnames from 'classnames';
-import {FormattedMessage, injectIntl, WrappedComponentProps} from 'react-intl';
+import {FormattedMessage, useIntl} from 'react-intl';
 import {observer} from 'mobx-react';
-import * as React from 'react';
+import {FC, useEffect, useState} from 'react';
 
 import type {TorrentContent, TorrentContentSelection, TorrentContentSelectionTree} from '@shared/types/TorrentContent';
 
@@ -15,199 +14,180 @@ import TorrentActions from '../../../actions/TorrentActions';
 import TorrentStore from '../../../stores/TorrentStore';
 import UIStore from '../../../stores/UIStore';
 
-@observer
-class TorrentContents extends React.Component<WrappedComponentProps> {
-  contents = observable.array<TorrentContent>([]);
-  itemsTree = observable.object<TorrentContentSelectionTree>({});
-  selectedIndices = observable.array<number>([]);
-  polling = setInterval(() => {
-    // TODO: itemsTree is not regenerated as that would override user's selection.
-    // As a result, percentage of contents of an active torrent is not updated.
-    // this.fetchTorrentContents();
-  }, ConfigStore.pollInterval);
+const TorrentContents: FC = observer(() => {
+  const [contents, setContents] = useState<TorrentContent[]>([]);
+  const [itemsTree, setItemsTree] = useState<TorrentContentSelectionTree>({});
+  const [selectedIndices, setSelectedIndices] = useState<number[]>([]);
+  const intl = useIntl();
 
-  constructor(props: WrappedComponentProps) {
-    super(props);
-
-    this.fetchTorrentContents(true);
-  }
-
-  componentWillUnmount() {
-    clearInterval(this.polling);
-  }
-
-  fetchTorrentContents = (populateTree = false) => {
+  useEffect(() => {
     if (UIStore.activeModal?.id === 'torrent-details') {
-      TorrentActions.fetchTorrentContents(UIStore.activeModal?.hash).then((contents) => {
-        if (contents != null) {
-          runInAction(() => {
-            this.contents.replace(contents);
-            if (populateTree) {
-              this.itemsTree = selectionTree.getSelectionTree(this.contents);
-            }
-          });
+      TorrentActions.fetchTorrentContents(UIStore.activeModal?.hash).then((fetchedContents) => {
+        if (fetchedContents != null) {
+          setContents(fetchedContents);
+          setItemsTree(selectionTree.getSelectionTree(fetchedContents));
         }
       });
     }
-  };
+  }, []);
 
-  handleDownloadButtonClick = (hash: string, event: React.MouseEvent<HTMLButtonElement>): void => {
-    event.preventDefault();
-    const {baseURI} = ConfigStore;
-    const link = document.createElement('a');
+  if (UIStore.activeModal?.id !== 'torrent-details') {
+    return null;
+  }
 
-    link.download = '';
-    link.href = `${baseURI}api/torrents/${hash}/contents/${this.selectedIndices.join(',')}/data`;
-    link.style.display = 'none';
+  const {hash} = UIStore?.activeModal;
 
-    document.body.appendChild(link);
-    link.click();
-    document.body.removeChild(link);
-  };
+  let directoryHeadingIconContent = null;
+  let fileDetailContent = null;
 
-  handleFormChange = (hash: string, {event}: {event: Event | React.FormEvent<HTMLFormElement>}): void => {
-    if (event.target != null && (event.target as HTMLInputElement).name === 'file-priority') {
-      const inputElement = event.target as HTMLInputElement;
-      if (inputElement.name === 'file-priority') {
-        TorrentActions.setFilePriority(hash, {
-          indices: this.selectedIndices,
-          priority: Number(inputElement.value),
-        });
-      }
-    }
-  };
-
-  handleItemSelect = (selectedItem: TorrentContentSelection) => {
-    runInAction(() => {
-      this.itemsTree = selectionTree.applySelection(this.itemsTree, selectedItem);
-      this.selectedIndices.replace(selectionTree.getSelectedItems(this.itemsTree));
-    });
-  };
-
-  handleSelectAllClick = () => {
-    runInAction(() => {
-      this.itemsTree = selectionTree.getSelectionTree(
-        this.contents,
-        this.selectedIndices.length < this.contents.length,
-      );
-      this.selectedIndices.replace(selectionTree.getSelectedItems(this.itemsTree));
-    });
-  };
-
-  render() {
-    if (UIStore.activeModal?.id !== 'torrent-details') {
-      return null;
-    }
-
-    const {hash} = UIStore?.activeModal;
-
-    let directoryHeadingIconContent = null;
-    let fileDetailContent = null;
-
-    let allSelected = false;
-    if (this.contents?.length > 0) {
-      allSelected = this.selectedIndices.length >= this.contents.length;
-      directoryHeadingIconContent = (
-        <div className="file__checkbox directory-tree__checkbox">
-          <div
-            className="directory-tree__checkbox__item
+  let allSelected = false;
+  if (contents?.length > 0) {
+    allSelected = selectedIndices.length >= contents.length;
+    directoryHeadingIconContent = (
+      <div className="file__checkbox directory-tree__checkbox">
+        <div
+          className="directory-tree__checkbox__item
             directory-tree__checkbox__item--checkbox">
-            <FormRow>
-              <Checkbox checked={allSelected} onClick={this.handleSelectAllClick} />
-            </FormRow>
-          </div>
-          <div
-            className="directory-tree__checkbox__item
+          <FormRow>
+            <Checkbox
+              checked={allSelected}
+              onClick={() => {
+                // select or deselect all
+                const newItemsTree = selectionTree.getSelectionTree(contents, selectedIndices.length < contents.length);
+
+                setItemsTree(newItemsTree);
+                setSelectedIndices(selectionTree.getSelectedItems(newItemsTree));
+              }}
+            />
+          </FormRow>
+        </div>
+        <div
+          className="directory-tree__checkbox__item
             directory-tree__checkbox__item--icon">
-            <Disk />
-          </div>
-        </div>
-      );
-      fileDetailContent = (
-        <DirectoryTree depth={0} onItemSelect={this.handleItemSelect} hash={hash} itemsTree={this.itemsTree} />
-      );
-    } else {
-      directoryHeadingIconContent = <Disk />;
-      fileDetailContent = (
-        <div className="directory-tree__node directory-tree__node--file">
-          <FormattedMessage id="torrents.details.files.loading" />
-        </div>
-      );
-    }
-
-    const directoryHeadingClasses = classnames(
-      'directory-tree__node',
-      'directory-tree__parent-directory torrent-details__section__heading',
-      {
-        'directory-tree__node--selected': allSelected,
-      },
-    );
-
-    const directoryHeading = (
-      <div className={directoryHeadingClasses}>
-        <div className="file__label">
-          {directoryHeadingIconContent}
-          <div className="file__name">{TorrentStore.torrents?.[hash].directory}</div>
+          <Disk />
         </div>
       </div>
     );
-
-    const wrapperClasses = classnames('inverse directory-tree__wrapper', {
-      'directory-tree__wrapper--toolbar-visible': this.selectedIndices.length > 0,
-    });
-
-    return (
-      <Form className={wrapperClasses} onChange={(e) => this.handleFormChange(hash, e)}>
-        <div className="directory-tree__selection-toolbar">
-          <FormRow align="center">
-            <FormRowItem width="one-quarter" grow={false} shrink={false}>
-              <FormattedMessage
-                id="torrents.details.selected.files"
-                values={{
-                  count: this.selectedIndices.length,
-                  countElement: (
-                    <span className="directory-tree__selection-toolbar__item-count">{this.selectedIndices.length}</span>
-                  ),
-                }}
-              />
-            </FormRowItem>
-            <Button onClick={(e) => this.handleDownloadButtonClick(hash, e)} grow={false} shrink={false}>
-              <FormattedMessage
-                id="torrents.details.files.download.file"
-                values={{
-                  count: this.selectedIndices.length,
-                }}
-              />
-            </Button>
-            <Select id="file-priority" persistentPlaceholder shrink={false} defaultID="">
-              <SelectItem placeholder>
-                <FormattedMessage id="torrents.details.selected.files.set.priority" />
-              </SelectItem>
-              <SelectItem id={0}>
-                {this.props.intl.formatMessage({
-                  id: 'priority.dont.download',
-                })}
-              </SelectItem>
-              <SelectItem id={1}>
-                {this.props.intl.formatMessage({
-                  id: 'priority.normal',
-                })}
-              </SelectItem>
-              <SelectItem id={2}>
-                {this.props.intl.formatMessage({
-                  id: 'priority.high',
-                })}
-              </SelectItem>
-            </Select>
-          </FormRow>
-        </div>
-        <div className="directory-tree torrent-details__section torrent-details__section--file-tree modal__content--nested-scroll__content">
-          {directoryHeading}
-          {fileDetailContent}
-        </div>
-      </Form>
+    fileDetailContent = (
+      <DirectoryTree
+        depth={0}
+        onItemSelect={(selectedItem: TorrentContentSelection) => {
+          const newItemsTree = selectionTree.applySelection(itemsTree, selectedItem);
+          setItemsTree(newItemsTree);
+          setSelectedIndices(selectionTree.getSelectedItems(newItemsTree));
+        }}
+        hash={hash}
+        itemsTree={itemsTree}
+      />
+    );
+  } else {
+    directoryHeadingIconContent = <Disk />;
+    fileDetailContent = (
+      <div className="directory-tree__node directory-tree__node--file">
+        <FormattedMessage id="torrents.details.files.loading" />
+      </div>
     );
   }
-}
 
-export default injectIntl(TorrentContents);
+  const directoryHeadingClasses = classnames(
+    'directory-tree__node',
+    'directory-tree__parent-directory torrent-details__section__heading',
+    {
+      'directory-tree__node--selected': allSelected,
+    },
+  );
+
+  const directoryHeading = (
+    <div className={directoryHeadingClasses}>
+      <div className="file__label">
+        {directoryHeadingIconContent}
+        <div className="file__name">{TorrentStore.torrents?.[hash].directory}</div>
+      </div>
+    </div>
+  );
+
+  const wrapperClasses = classnames('inverse directory-tree__wrapper', {
+    'directory-tree__wrapper--toolbar-visible': selectedIndices.length > 0,
+  });
+
+  return (
+    <Form
+      className={wrapperClasses}
+      onChange={({event}) => {
+        if (event.target != null && (event.target as HTMLInputElement).name === 'file-priority') {
+          const inputElement = event.target as HTMLInputElement;
+          if (inputElement.name === 'file-priority') {
+            TorrentActions.setFilePriority(hash, {
+              indices: selectedIndices,
+              priority: Number(inputElement.value),
+            });
+          }
+        }
+      }}>
+      <div className="directory-tree__selection-toolbar">
+        <FormRow align="center">
+          <FormRowItem width="one-quarter" grow={false} shrink={false}>
+            <FormattedMessage
+              id="torrents.details.selected.files"
+              values={{
+                count: selectedIndices.length,
+                countElement: (
+                  <span className="directory-tree__selection-toolbar__item-count">{selectedIndices.length}</span>
+                ),
+              }}
+            />
+          </FormRowItem>
+          <Button
+            onClick={(event) => {
+              event.preventDefault();
+              const {baseURI} = ConfigStore;
+              const link = document.createElement('a');
+
+              link.download = '';
+              link.href = `${baseURI}api/torrents/${hash}/contents/${selectedIndices.join(',')}/data`;
+              link.style.display = 'none';
+
+              document.body.appendChild(link);
+              link.click();
+              document.body.removeChild(link);
+            }}
+            grow={false}
+            shrink={false}>
+            <FormattedMessage
+              id="torrents.details.files.download.file"
+              values={{
+                count: selectedIndices.length,
+              }}
+            />
+          </Button>
+          <Select id="file-priority" persistentPlaceholder shrink={false} defaultID="">
+            <SelectItem placeholder>
+              <FormattedMessage id="torrents.details.selected.files.set.priority" />
+            </SelectItem>
+            <SelectItem id={0}>
+              {intl.formatMessage({
+                id: 'priority.dont.download',
+              })}
+            </SelectItem>
+            <SelectItem id={1}>
+              {intl.formatMessage({
+                id: 'priority.normal',
+              })}
+            </SelectItem>
+            <SelectItem id={2}>
+              {intl.formatMessage({
+                id: 'priority.high',
+              })}
+            </SelectItem>
+          </Select>
+        </FormRow>
+      </div>
+      <div className="directory-tree torrent-details__section torrent-details__section--file-tree modal__content--nested-scroll__content">
+        {directoryHeading}
+        {fileDetailContent}
+      </div>
+    </Form>
+  );
+});
+
+export default TorrentContents;