feat: gaps in tailwind migration closed

assets/js/hooks/chat_surface.js

@@ -0,0 +1,139 @@
+export const ChatSurface = {
+  mounted() {
+    this.stickToBottom = true;
+    this.scrollContainer = null;
+
+    this.autoResize = () => {
+      const textarea = this.el.querySelector(".chat-input");
+
+      if (!textarea) {
+        return;
+      }
+
+      const styles = getComputedStyle(textarea);
+      const minHeight = parseFloat(styles.getPropertyValue("--chat-input-min-height")) || 20;
+      const maxHeight = parseFloat(styles.getPropertyValue("--chat-input-max-height")) || 160;
+
+      textarea.rows = 1;
+      textarea.style.minHeight = `${minHeight}px`;
+
+      if (textarea.value.trim() === "") {
+        textarea.style.height = `${minHeight}px`;
+        textarea.style.maxHeight = `${minHeight}px`;
+        textarea.style.overflowY = "hidden";
+        return;
+      }
+
+      textarea.style.maxHeight = `${maxHeight}px`;
+      textarea.style.height = "0px";
+      const nextHeight = Math.min(Math.max(textarea.scrollHeight, minHeight), maxHeight);
+      textarea.style.height = `${nextHeight}px`;
+      textarea.style.overflowY = nextHeight >= maxHeight ? "auto" : "hidden";
+    };
+
+    this.syncScrollContainer = () => {
+      const nextContainer = this.el.querySelector(".chat-messages");
+
+      if (nextContainer === this.scrollContainer) {
+        return;
+      }
+
+      if (this.scrollContainer) {
+        this.scrollContainer.removeEventListener("scroll", this.handleScroll);
+      }
+
+      this.scrollContainer = nextContainer;
+
+      if (this.scrollContainer) {
+        this.scrollContainer.addEventListener("scroll", this.handleScroll);
+      }
+    };
+
+    this.scrollToBottom = (force = false) => {
+      if (!this.scrollContainer) {
+        return;
+      }
+
+      if (force || this.stickToBottom) {
+        this.scrollContainer.scrollTop = this.scrollContainer.scrollHeight;
+      }
+    };
+
+    this.syncExpandedSurfaces = () => {
+      this.el
+        .querySelectorAll(".chat-inline-surface[data-expanded='true']")
+        .forEach((surface) => {
+          surface.open = true;
+        });
+    };
+
+    this.surfaceObserver = new MutationObserver(() => {
+      this.syncExpandedSurfaces();
+    });
+
+    this.handleScroll = () => {
+      if (!this.scrollContainer) {
+        this.stickToBottom = true;
+        return;
+      }
+
+      const distanceFromBottom =
+        this.scrollContainer.scrollHeight -
+        this.scrollContainer.scrollTop -
+        this.scrollContainer.clientHeight;
+
+      this.stickToBottom = distanceFromBottom < 48;
+    };
+
+    this.handleInput = (event) => {
+      if (!event.target.closest(".chat-input")) {
+        return;
+      }
+
+      this.stickToBottom = true;
+      this.autoResize();
+    };
+
+    this.handleKeyDown = (event) => {
+      if (!event.target.closest(".chat-input")) {
+        return;
+      }
+
+      if (event.key === "Enter" && !event.shiftKey && !event.isComposing) {
+        event.preventDefault();
+
+        const sendButton = this.el.querySelector("[data-testid='chat-send-button']");
+
+        if (sendButton && !sendButton.disabled) {
+          sendButton.click();
+        }
+      }
+    };
+
+    this.el.addEventListener("input", this.handleInput);
+    this.el.addEventListener("keydown", this.handleKeyDown);
+
+    this.syncScrollContainer();
+    this.syncExpandedSurfaces();
+    this.surfaceObserver.observe(this.el, { childList: true, subtree: true });
+    this.autoResize();
+    window.requestAnimationFrame(() => this.scrollToBottom(true));
+  },
+
+  updated() {
+    this.syncScrollContainer();
+    this.syncExpandedSurfaces();
+    this.autoResize();
+    window.requestAnimationFrame(() => this.scrollToBottom());
+  },
+
+  destroyed() {
+    this.surfaceObserver.disconnect();
+    this.el.removeEventListener("input", this.handleInput);
+    this.el.removeEventListener("keydown", this.handleKeyDown);
+
+    if (this.scrollContainer) {
+      this.scrollContainer.removeEventListener("scroll", this.handleScroll);
+    }
+  }
+};