feat(island): take a file drop for the assistant

A DropArea over the sliver grows into a bubble while a file drag is over it and hands file:// paths to the canvas.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

3 files changed, 64 insertions, 0 deletions

diff --git a/desktop/island/Island.qml b/desktop/island/Island.qml
index 3dbd36d..4fba033 100644
--- a/desktop/island/Island.qml
+++ b/desktop/island/Island.qml
@@ -17,6 +17,7 @@ import QtQuick
 import ".."
 import "../modules/sound"
 import "Logic.js" as Logic
+import "../assistant/Files.js" as Files
 
 // The island: a sliver at the top centre of DP-1 that the two pills slide
 // out of. The window is a fixed overlay strip that never resizes; the pills
@@ -27,6 +28,7 @@ PanelWindow {
 
     required property QtObject sound    // the sound module's Service
     required property QtObject drawer   // Drawer, for the sound page link
+    property QtObject asst: null        // the assistant canvas, for dropped files
 
     screen: Quickshell.screens.find(s => s.name === "DP-1") ?? Quickshell.screens[0]
     anchors { top: true; left: true; right: true }
@@ -147,6 +149,7 @@ PanelWindow {
 
     mask: Region {
         item: sliverHit
+        Region { item: receptor; intersection: Intersection.Combine }
         Region { item: clock; intersection: Intersection.Combine }
         Region { item: status; intersection: Intersection.Combine }
         Region { item: media.visible ? media : null; intersection: Intersection.Combine }
@@ -187,6 +190,57 @@ PanelWindow {
         hoverEnabled: true
     }
 
+    // --- file drop ---------------------------------------------------------
+
+    // A file dragged onto the sliver opens a bubble to drop it on; the drop
+    // hands it to the assistant canvas. Wayland reports a drag only once it
+    // enters an input region, so the receptor is the sliver's width at rest
+    // and grows to hold the bubble while a drag is over it.
+    property bool dropHold: false
+
+    Item {
+        id: receptor
+        x: win.cx - width / 2
+        y: 0
+        z: 10
+        width: 260
+        height: win.dropHold ? 100 : 10
+
+        DropArea {
+            anchors.fill: parent
+            enabled: win.asst !== null
+            onEntered: drag => {
+                drag.accepted = drag.hasUrls && (drag.supportedActions & Qt.CopyAction);
+                if (drag.accepted) { win.dropHold = true; drag.accept(Qt.CopyAction); }
+            }
+            onExited: win.dropHold = false
+            onDropped: drop => {
+                win.dropHold = false;
+                const paths = drop.urls.map(u => Files.fromUrl(u)).filter(p => p !== "");
+                if (!paths.length) { drop.accepted = false; return; }
+                win.asst.attach(paths);
+                drop.accept(Qt.CopyAction);
+            }
+        }
+
+        Rectangle {
+            visible: win.dropHold
+            anchors { horizontalCenter: parent.horizontalCenter; top: parent.top; topMargin: 14 }
+            width: parent.width
+            height: 72
+            radius: 16
+            color: Qt.alpha(Theme.base, 0.9)
+            border.width: 1
+            border.color: Qt.alpha(Theme.accent, 0.6)
+            Text {
+                anchors.centerIn: parent
+                text: "Drop for the assistant"
+                color: Theme.text
+                font { family: Theme.fontFamily; pixelSize: Theme.fontSize - 2 }
+            }
+        }
+    }
+
     // Both pills start overlapped at the sliver, above the screen edge, and
     // travel down and apart. At reveal 1 the clock ends gap/2 left of the
     // centre and the status gap/2 right of it; the status pill's left edge
diff --git a/desktop/island/README.md b/desktop/island/README.md
index 1511279..3387e2b 100644
--- a/desktop/island/README.md
+++ b/desktop/island/README.md
@@ -131,3 +131,12 @@ The window sets namespace `quickshell-island`. For frosting, add to
     })
 
 Without it the island renders flat translucent.
+
+## File drop
+
+A file dragged onto the sliver opens a bubble, "Drop for the assistant";
+dropping on it hands the file to the assistant canvas, which opens in its
+file state with a new conversation. Wayland reports a drag only once it
+enters one of the surface's input regions, so the receptor is the sliver's
+width at rest and grows to hold the bubble while a drag is over it. Only
+`file://` URLs are taken.
diff --git a/desktop/shell.qml b/desktop/shell.qml
index a67234a..f3170a6 100644
--- a/desktop/shell.qml
+++ b/desktop/shell.qml
@@ -81,6 +81,7 @@ ShellRoot {
         id: island
         sound: soundModule.service
         drawer: drawer
+        asst: assistant
     }
 
     // The assistant canvas on SUPER+Home, a view over desktop-assistant's