documents: dropped files and pasted pictures go to the owner; insert puts text at the caret

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/documents/document/attach.rs

@@ -0,0 +1,62 @@
+//! Dropped files and pasted pictures go to the owner.
+
+use std::path::PathBuf;
+
+use gpui::{ClipboardEntry, Context, EventEmitter, Image};
+
+use super::MarkdownDocument;
+use crate::documents::MarkdownMode;
+
+/// What was dropped on or pasted into the document.
+#[derive(Clone, Debug, PartialEq)]
+pub enum Attachment {
+    /// Files dropped, as they lie on disk.
+    Files(Vec<PathBuf>),
+    /// A picture pasted with no text beside it.
+    Picture(Image),
+}
+
+impl EventEmitter<Attachment> for MarkdownDocument {}
+
+impl MarkdownDocument {
+    /// A pasted picture goes to the owner; false leaves it.
+    pub(super) fn paste_picture(&mut self, cx: &mut Context<Self>) -> bool {
+        let Some(item) = cx.read_from_clipboard() else {
+            return false;
+        };
+        let entries = item.entries();
+        if entries
+            .iter()
+            .any(|entry| matches!(entry, ClipboardEntry::String(_)))
+        {
+            return false;
+        }
+        let Some(picture) = entries.iter().find_map(|entry| match entry {
+            ClipboardEntry::Image(image) => Some(image.clone()),
+            _ => None,
+        }) else {
+            return false;
+        };
+        log::info!("markdown document: a picture pasted");
+        cx.emit(Attachment::Picture(picture));
+        true
+    }
+
+    /// `text` at the caret, as typed; false in preview.
+    pub fn insert(&mut self, text: &str, cx: &mut Context<Self>) -> bool {
+        if self.mode == MarkdownMode::Preview {
+            return false;
+        }
+        if let Some(open) = &self.open {
+            open.input.update(cx, |input, cx| input.insert(text, cx));
+            return true;
+        }
+        let caret = self.editor.read(cx).primary().range();
+        let after = caret.start + text.len();
+        self.editor.update(cx, |editor, cx| {
+            editor.edit([(caret, text.to_string())], cx);
+            editor.select(std::iter::once(after..after), cx);
+        });
+        true
+    }
+}

src/documents/document/mod.rs

@@ -1,3 +1,4 @@
+mod attach;
 mod edit;
 mod finding;
 mod lists;
@@ -17,6 +18,7 @@ use gpui::{
     ListState, Subscription, Task, Window,
 };
 
+pub use attach::Attachment;
 pub use parse::DocumentHeading;
 use parse::{Parsed, alike, parsed};
 pub use tables::{TableEdit, TableRefusal};

src/documents/document/tests/attach.rs

@@ -0,0 +1,76 @@
+use std::{cell::RefCell, path::PathBuf, rc::Rc};
+
+use gpui::{
+    ClipboardItem, Entity, ExternalPaths, FileDropEvent, Image, ImageFormat, Modifiers,
+    TestAppContext, VisualTestContext, point, px,
+};
+
+use super::{MarkdownDocument, MarkdownMode, open, opened, press, text};
+use crate::documents::Attachment;
+
+/// Attachments the document hands its owner.
+fn heard(
+    document: &Entity<MarkdownDocument>,
+    cx: &mut VisualTestContext,
+) -> Rc<RefCell<Vec<Attachment>>> {
+    let heard = Rc::new(RefCell::new(Vec::new()));
+    let kept = heard.clone();
+    cx.update(|_, cx| {
+        cx.subscribe(document, move |_, attached: &Attachment, _| {
+            kept.borrow_mut().push(attached.clone())
+        })
+        .detach()
+    });
+    heard
+}
+
+fn picture() -> Image {
+    Image::from_bytes(ImageFormat::Png, vec![1, 2, 3])
+}
+
+#[gpui::test]
+fn dropped_files_go_to_the_owner(cx: &mut TestAppContext) {
+    let (document, cx) = open("a\n", MarkdownMode::Visual, cx);
+    let heard = heard(&document, cx);
+    let at = point(px(100.0), px(100.0));
+    let paths = ExternalPaths(vec![PathBuf::from("shot.png")].into());
+    cx.simulate_event(FileDropEvent::Entered {
+        position: at,
+        paths,
+    });
+    cx.simulate_event(FileDropEvent::Submit { position: at });
+    cx.run_until_parked();
+    assert_eq!(
+        *heard.borrow(),
+        [Attachment::Files(vec![PathBuf::from("shot.png")])]
+    );
+}
+
+#[gpui::test]
+fn a_pasted_picture_goes_to_the_owner_and_text_pastes(cx: &mut TestAppContext) {
+    let (document, cx) = open("a\n", MarkdownMode::Visual, cx);
+    let heard = heard(&document, cx);
+    press(0, Modifiers::none(), cx);
+    cx.write_to_clipboard(ClipboardItem::new_image(&picture()));
+    cx.simulate_keystrokes("secondary-v");
+    assert_eq!(*heard.borrow(), [Attachment::Picture(picture())]);
+    assert_eq!(opened(&document, cx), "a", "the picture typed nothing");
+    cx.write_to_clipboard(ClipboardItem::new_string("b".into()));
+    cx.simulate_keystrokes("secondary-v");
+    assert_eq!(opened(&document, cx), "ab", "text pastes as text");
+}
+
+#[gpui::test]
+fn text_goes_in_at_the_caret_but_not_in_preview(cx: &mut TestAppContext) {
+    let (document, cx) = open("ab\n", MarkdownMode::Source, cx);
+    document.update(cx, |document, cx| {
+        document.set_caret(0, 1, cx);
+        assert!(document.insert("X", cx));
+    });
+    assert_eq!(text(&document, cx), "aXb\n");
+    document.update_in(cx, |document, window, cx| {
+        document.set_mode(MarkdownMode::Preview, window, cx)
+    });
+    assert!(!document.update(cx, |document, cx| document.insert("Y", cx)));
+    assert_eq!(text(&document, cx), "aXb\n");
+}

src/documents/document/tests/mod.rs

@@ -365,6 +365,7 @@ fn a_press_after_a_write_back_waits_for_the_long_read(cx: &mut TestAppContext) {
     assert_eq!(opened(&document, cx), "B", "once read, B opens whole");
 }
 
+mod attach;
 mod history;
 mod links;
 mod place;

src/documents/document/visual.rs

@@ -1,7 +1,7 @@
 use gpui::{
-    AnyElement, App, ClickEvent, Context, FontWeight, InteractiveElement, IntoElement, KeyBinding,
-    MouseButton, MouseDownEvent, ParentElement, Render, StatefulInteractiveElement, Styled, Window,
-    actions, div, list,
+    AnyElement, App, ClickEvent, Context, ExternalPaths, FontWeight, InteractiveElement,
+    IntoElement, KeyBinding, MouseButton, MouseDownEvent, ParentElement, Render,
+    StatefulInteractiveElement, Styled, Window, actions, div, list,
 };
 
 use super::MarkdownDocument;
@@ -12,7 +12,7 @@ use crate::{
     theme::{ActiveTheme, Radius, TextSize},
 };
 
-actions!(markdown_document, [Undo, Redo, Indent, Outdent]);
+actions!(markdown_document, [Undo, Redo, Indent, Outdent, Paste]);
 
 const CONTEXT: &str = "MarkdownDocument";
 
@@ -23,6 +23,7 @@ pub(crate) fn bind_keys(cx: &mut App) {
     let mut bindings = vec![
         KeyBinding::new("secondary-z", Undo, context),
         KeyBinding::new("secondary-shift-z", Redo, context),
+        KeyBinding::new("secondary-v", Paste, context),
         KeyBinding::new("tab", Indent, block),
         KeyBinding::new("shift-tab", Outdent, block),
     ];
@@ -144,10 +145,19 @@ impl Render for MarkdownDocument {
         let root = div()
             .size_full()
             .bg(colors.surface)
-            .font_weight(FontWeight::NORMAL);
+            .font_weight(FontWeight::NORMAL)
+            .on_drop(cx.listener(|_, dropped: &ExternalPaths, _, cx| {
+                log::info!("markdown document: {} files dropped", dropped.paths().len());
+                cx.emit(super::Attachment::Files(dropped.paths().to_vec()));
+            }));
         let blocks = list(self.list.clone(), cx.processor(Self::item)).size_full();
         match self.mode {
             MarkdownMode::Source => root
+                .capture_action(cx.listener(|document, _: &crate::editor::Paste, _, cx| {
+                    if document.paste_picture(cx) {
+                        cx.stop_propagation();
+                    }
+                }))
                 .capture_action(cx.listener(|document, _: &crate::editor::Newline, _, cx| {
                     if document.source_newline(cx) {
                         cx.stop_propagation();
@@ -184,6 +194,14 @@ impl Render for MarkdownDocument {
                     cx.stop_propagation();
                     document.history(true, window, cx);
                 }))
+                .capture_action(cx.listener(|document, _: &forms::Paste, _, cx| {
+                    if document.paste_picture(cx) {
+                        cx.stop_propagation();
+                    }
+                }))
+                .on_action(cx.listener(|document, _: &Paste, _, cx| {
+                    document.paste_picture(cx);
+                }))
                 .capture_action(cx.listener(|document, _: &forms::Enter, _, cx| {
                     if document.block_newline(cx) {
                         cx.stop_propagation();

src/documents/mod.rs

@@ -35,7 +35,8 @@ pub use contents::outline;
 pub use counts::{ReadingTime, WordCount};
 pub use diagram::Diagram;
 pub use document::{
-    DocumentEvent, DocumentHeading, LARGEST_READ, MarkdownDocument, TableEdit, TableRefusal,
+    Attachment, DocumentEvent, DocumentHeading, LARGEST_READ, MarkdownDocument, TableEdit,
+    TableRefusal,
 };
 pub use epub::{Chapter, EpubReader};
 pub use format::{Format, format};

src/editor/mod.rs

@@ -48,7 +48,7 @@ pub use find::{FindOptions, FindWidget, find_all};
 pub use hints::{CompletionItem, CompletionMenu, Signature, SignatureHelp, completions};
 pub use hover::HoverInfo;
 pub use keybindings::{KeySource, Keybinding, KeybindingsEditor, conflicts};
-pub(crate) use keys::{Newline, bind_keys};
+pub(crate) use keys::{Newline, Paste, bind_keys};
 pub(crate) use layout::stack;
 pub use preview::ThemePreview;
 pub use problems::{Problem, ProblemsPanel};

src/forms/mod.rs

@@ -116,8 +116,8 @@ pub use switch::Switch;
 pub(crate) use syntax::{Syntax, syntax_fenced, syntax_of};
 pub use tags::TagInput;
 pub(crate) use text::{
-    Backspace, Copy, Cut, Delete, DeleteWordLeft, Down, Enter, Redo, Submit, Undo, Up, bind_keys,
-    from_utf16, to_utf16,
+    Backspace, Copy, Cut, Delete, DeleteWordLeft, Down, Enter, Paste, Redo, Submit, Undo, Up,
+    bind_keys, from_utf16, to_utf16,
 };
 pub use text::{Highlight, History, InputEvent, TextInput};
 pub use transfer::TransferList;

src/forms/text/mod.rs

@@ -13,7 +13,8 @@ use gpui::{
 };
 
 pub(crate) use actions::{
-    Backspace, Copy, Cut, Delete, DeleteWordLeft, Down, Enter, Redo, Submit, Undo, Up, bind_keys,
+    Backspace, Copy, Cut, Delete, DeleteWordLeft, Down, Enter, Paste, Redo, Submit, Undo, Up,
+    bind_keys,
 };
 pub use edit::History;
 use edit::Snapshot;