feat(app): drag-n-drop to @mention file (#12569)

3 files changed, 32 insertions, 12 deletions

diff --git a/packages/app/src/components/prompt-input.tsx b/packages/app/src/components/prompt-input.tsx
index 2bccddc29..3ac64fad2 100644
--- a/packages/app/src/components/prompt-input.tsx
+++ b/packages/app/src/components/prompt-input.tsx
@@ -205,7 +205,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
     historyIndex: number
     savedPrompt: Prompt | null
     placeholder: number
-    dragging: boolean
+    draggingType: "image" | "@mention" | null
     mode: "normal" | "shell"
     applyingHistory: boolean
   }>({
@@ -213,7 +213,7 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
     historyIndex: -1,
     savedPrompt: null,
     placeholder: Math.floor(Math.random() * EXAMPLES.length),
-    dragging: false,
+    draggingType: null,
     mode: "normal",
     applyingHistory: false,
   })
@@ -760,7 +760,11 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
     editor: () => editorRef,
     isFocused,
     isDialogActive: () => !!dialog.active,
-    setDragging: (value) => setStore("dragging", value),
+    setDraggingType: (type) => setStore("draggingType", type),
+    focusEditor: () => {
+      editorRef.focus()
+      setCursorPosition(editorRef, promptLength(prompt.current()))
+    },
     addPart,
   })
 
@@ -946,11 +950,14 @@ export const PromptInput: Component<PromptInputProps> = (props) => {
           "group/prompt-input": true,
           "bg-surface-raised-stronger-non-alpha shadow-xs-border relative": true,
           "rounded-[14px] overflow-clip focus-within:shadow-xs-border": true,
-          "border-icon-info-active border-dashed": store.dragging,
+          "border-icon-info-active border-dashed": store.draggingType !== null,
           [props.class ?? ""]: !!props.class,
         }}
       >
-        <PromptDragOverlay dragging={store.dragging} label={language.t("prompt.dropzone.label")} />
+        <PromptDragOverlay
+          type={store.draggingType}
+          label={language.t(store.draggingType === "@mention" ? "prompt.dropzone.file.label" : "prompt.dropzone.label")}
+        />
         <PromptContextItems
           items={prompt.context.items()}
           active={(item) => {
diff --git a/packages/app/src/components/prompt-input/attachments.ts b/packages/app/src/components/prompt-input/attachments.ts
index 4ea2cfb90..48eda3742 100644
--- a/packages/app/src/components/prompt-input/attachments.ts
+++ b/packages/app/src/components/prompt-input/attachments.ts
@@ -11,7 +11,8 @@ type PromptAttachmentsInput = {
   editor: () => HTMLDivElement | undefined
   isFocused: () => boolean
   isDialogActive: () => boolean
-  setDragging: (value: boolean) => void
+  setDraggingType: (type: "image" | "@mention" | null) => void
+  focusEditor: () => void
   addPart: (part: ContentPart) => void
 }
 
@@ -84,15 +85,18 @@ export function createPromptAttachments(input: PromptAttachmentsInput) {
 
     event.preventDefault()
     const hasFiles = event.dataTransfer?.types.includes("Files")
+    const hasText = event.dataTransfer?.types.includes("text/plain")
     if (hasFiles) {
-      input.setDragging(true)
+      input.setDraggingType("image")
+    } else if (hasText) {
+      input.setDraggingType("@mention")
     }
   }
 
   const handleGlobalDragLeave = (event: DragEvent) => {
     if (input.isDialogActive()) return
     if (!event.relatedTarget) {
-      input.setDragging(false)
+      input.setDraggingType(null)
     }
   }
 
@@ -100,7 +104,16 @@ export function createPromptAttachments(input: PromptAttachmentsInput) {
     if (input.isDialogActive()) return
 
     event.preventDefault()
-    input.setDragging(false)
+    input.setDraggingType(null)
+
+    const plainText = event.dataTransfer?.getData("text/plain")
+    const filePrefix = "file:"
+    if (plainText?.startsWith(filePrefix)) {
+      const filePath = plainText.slice(filePrefix.length)
+      input.focusEditor()
+      input.addPart({ type: "file", path: filePath, content: "@" + filePath, start: 0, end: 0 })
+      return
+    }
 
     const dropped = event.dataTransfer?.files
     if (!dropped) return
diff --git a/packages/app/src/components/prompt-input/drag-overlay.tsx b/packages/app/src/components/prompt-input/drag-overlay.tsx
index f5a4d399e..e05b47d7c 100644
--- a/packages/app/src/components/prompt-input/drag-overlay.tsx
+++ b/packages/app/src/components/prompt-input/drag-overlay.tsx
@@ -2,16 +2,16 @@ import { Component, Show } from "solid-js"
 import { Icon } from "@opencode-ai/ui/icon"
 
 type PromptDragOverlayProps = {
-  dragging: boolean
+  type: "image" | "@mention" | null
   label: string
 }
 
 export const PromptDragOverlay: Component<PromptDragOverlayProps> = (props) => {
   return (
-    <Show when={props.dragging}>
+    <Show when={props.type !== null}>
       <div class="absolute inset-0 z-10 flex items-center justify-center bg-surface-raised-stronger-non-alpha/90 pointer-events-none">
         <div class="flex flex-col items-center gap-2 text-text-weak">
-          <Icon name="photo" class="size-8" />
+          <Icon name={props.type === "@mention" ? "link" : "photo"} class="size-8" />
           <span class="text-14-regular">{props.label}</span>
         </div>
       </div>