From af9e353f5003cb323a46340acf1939123147a041 Mon Sep 17 00:00:00 2001
From: Ian Douglas Scott <idscott@system76.com>
Date: Tue, 7 Jan 2025 13:56:58 -0800
Subject: [PATCH] dnd_source: Add suppport for surface offset

The `drag_icon` callback is passed the offset of the cursor within the
widget at the start of the drag, and can return an offset the drag
surface should be placed relative to the cursor.
---
 iced                           |  2 +-
 src/widget/dnd_source.rs       | 17 +++++++++++------
 src/widget/text_input/input.rs |  3 ++-
 3 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/iced b/iced
index 2cc6865c908..9ad04dadde7 160000
--- a/iced
+++ b/iced
@@ -1 +1 @@
-Subproject commit 2cc6865c908d025e43d7fc937f6b67defd51ea18
+Subproject commit 9ad04dadde75ac4b445602fc6f31e05d7b7003c3
diff --git a/src/widget/dnd_source.rs b/src/widget/dnd_source.rs
index 38b921ee154..d57e099ba3f 100644
--- a/src/widget/dnd_source.rs
+++ b/src/widget/dnd_source.rs
@@ -32,7 +32,7 @@ pub struct DndSource<'a, Message, D> {
     container: Element<'a, Message>,
     window: Option<window::Id>,
     drag_content: Option<Box<dyn Fn() -> D>>,
-    drag_icon: Option<Box<dyn Fn() -> (Element<'static, ()>, tree::State)>>,
+    drag_icon: Option<Box<dyn Fn(Vector) -> (Element<'static, ()>, tree::State, Vector)>>,
     on_start: Option<Message>,
     on_cancelled: Option<Message>,
     on_finish: Option<Message>,
@@ -90,7 +90,7 @@ impl<
     #[must_use]
     pub fn drag_icon(
         mut self,
-        f: impl Fn() -> (Element<'static, ()>, tree::State) + 'static,
+        f: impl Fn(Vector) -> (Element<'static, ()>, tree::State, Vector) + 'static,
     ) -> Self {
         self.drag_icon = Some(Box::new(f));
         self
@@ -102,7 +102,7 @@ impl<
         self
     }
 
-    pub fn start_dnd(&self, clipboard: &mut dyn Clipboard, bounds: Rectangle) {
+    pub fn start_dnd(&self, clipboard: &mut dyn Clipboard, bounds: Rectangle, offset: Vector) {
         let Some(content) = self.drag_content.as_ref().map(|f| f()) else {
             return;
         };
@@ -116,13 +116,14 @@ impl<
                 Some(iced_core::clipboard::DndSource::Widget(self.id.clone()))
             },
             self.drag_icon.as_ref().map(|f| {
-                let (icon, state) = f();
-                (
+                let (icon, state, offset) = f(offset);
+                iced_core::clipboard::IconSurface::new(
                     container(icon)
                         .width(Length::Fixed(bounds.width))
                         .height(Length::Fixed(bounds.height))
                         .into(),
                     state,
+                    offset,
                 )
             }),
             Box::new(content),
@@ -262,7 +263,11 @@ impl<
                                     if let Some(on_start) = self.on_start.as_ref() {
                                         shell.publish(on_start.clone())
                                     }
-                                    self.start_dnd(clipboard, state.cached_bounds);
+                                    let offset = Vector::new(
+                                        left_pressed_position.x - layout.bounds().x,
+                                        left_pressed_position.y - layout.bounds().y,
+                                    );
+                                    self.start_dnd(clipboard, state.cached_bounds, offset);
                                     state.is_dragging = true;
                                     state.left_pressed_position = None;
                                 }
diff --git a/src/widget/text_input/input.rs b/src/widget/text_input/input.rs
index 80bd8b54094..0ff27127a73 100644
--- a/src/widget/text_input/input.rs
+++ b/src/widget/text_input/input.rs
@@ -1350,12 +1350,13 @@ where
                                     clipboard,
                                     false,
                                     id.map(|id| iced_core::clipboard::DndSource::Widget(id)),
-                                    Some((
+                                    Some(iced_core::clipboard::IconSurface::new(
                                         Element::from(
                                             TextInput::<'static, ()>::new("", input_text.clone())
                                                 .dnd_icon(true),
                                         ),
                                         iced_core::widget::tree::State::new(state_clone),
+                                        Vector::ZERO,
                                     )),
                                     Box::new(TextInputString(input_text)),
                                     DndAction::Move,