Switch from Entry to TextView for multiline, paste support for attachments

src/transcript/transcript-container-view.vala

@@ -1,6 +1,8 @@
 using Gtk;
 using Adw;
 using Gee;
+using Gdk;
+using GLib;
 
 class TranscriptContainerView : Adw.Bin 
 {
@@ -11,14 +13,17 @@ class TranscriptContainerView : Adw.Bin
     private Button send_button;
     private FlowBox attachment_flow_box;
 
-    private Entry message_entry;
+    private TextView message_view;
+    private TextBuffer message_buffer;
     private HashSet<string> pending_uploads;
     private HashMap<string, AttachmentPreview> attachment_previews;
     private ArrayList<UploadedAttachment> completed_attachments;
 
     public string message_body {
-        get {
-            return message_entry.text;
+        owned get {
+            TextIter start_iter, end_iter;
+            message_buffer.get_bounds(out start_iter, out end_iter);
+            return message_buffer.get_text(start_iter, end_iter, false);
         }
     }
 
@@ -36,7 +41,7 @@ class TranscriptContainerView : Adw.Bin
 
     private bool can_send {
         get {
-            return (message_entry.text.length > 0 || completed_attachments.size > 0) && pending_uploads.size == 0;
+            return (message_body.length > 0 || completed_attachments.size > 0) && pending_uploads.size == 0;
         }
     }
 
@@ -69,14 +74,38 @@ class TranscriptContainerView : Adw.Bin
         // Connect to repository signals
         Repository.get_instance().attachment_uploaded.connect(on_attachment_uploaded);
 
-        // Create message entry
-        message_entry = new Entry();
-        message_entry.add_css_class("message-input-entry");
-        message_entry.set_placeholder_text("Type a message...");
-        message_entry.set_hexpand(true);
-        message_entry.changed.connect(on_text_changed);
-        message_entry.activate.connect(on_request_send);
-        input_box.append(message_entry);
+        // Create attach button (paperclip)
+        var attach_button = new Button.from_icon_name("mail-attachment");
+        attach_button.set_tooltip_text("Attach file…");
+        attach_button.add_css_class("flat");
+        attach_button.clicked.connect(on_attach_button_clicked);
+        input_box.append(attach_button);
+
+        // Create message text view (added after attachment button so button stays to the left)
+        message_buffer = new TextBuffer(null);
+        message_view = new TextView.with_buffer(message_buffer);
+        message_view.add_css_class("message-input-entry");
+        message_view.set_wrap_mode(Gtk.WrapMode.WORD_CHAR);
+        message_view.set_hexpand(true);
+        message_view.set_vexpand(false);
+        message_view.set_size_request(-1, 12); // intrinsic
+        message_buffer.changed.connect(on_text_changed);
+
+        // Key controller for sending on Enter (Shift+Enter for newline)
+        var send_key_ctrl = new EventControllerKey();
+        send_key_ctrl.key_pressed.connect((keyval, keycode, state) => {
+            if (keyval == Gdk.Key.Return && (state & Gdk.ModifierType.SHIFT_MASK) == 0) {
+                on_request_send();
+                return true; // consume
+            }
+            return false;
+        });
+        message_view.add_controller(send_key_ctrl);
+
+        // Handle paste events to detect images
+        message_view.paste_clipboard.connect(on_message_paste_clipboard);
+
+        input_box.append(message_view);
 
         // Create send button
         send_button = new Button();
@@ -196,8 +225,8 @@ class TranscriptContainerView : Adw.Bin
         if (can_send) {
             on_send(this);
 
-            // Clear the message entry
-            message_entry.text = "";
+            // Clear the message text
+            message_buffer.set_text("");
 
             // Clear the attachment previews
             attachment_flow_box.remove_all();
@@ -208,6 +237,65 @@ class TranscriptContainerView : Adw.Bin
             update_send_button_sensitivity();
         }
     }
+
+    private void on_attach_button_clicked() {
+        var dialog = new Gtk.FileDialog();
+        dialog.set_title("Select attachment");
+        dialog.set_accept_label("Attach");
+        dialog.set_modal(true);
+    
+        // Images only for now
+        var filter = new Gtk.FileFilter();
+        filter.set_filter_name("Images");
+        filter.add_mime_type("image/png");
+        filter.add_mime_type("image/jpeg");
+        filter.add_mime_type("image/gif");
+        filter.add_mime_type("image/bmp");
+        filter.add_mime_type("image/webp");
+        filter.add_mime_type("image/svg+xml");
+        filter.add_mime_type("image/tiff");
+
+        dialog.set_default_filter(filter);
+
+        var parent_window = get_root() as Gtk.Window;
+        dialog.open.begin(parent_window, null, (obj, res) => {
+            try {
+                var file = dialog.open.end(res);
+                if (file != null) {
+                    upload_file(file);
+                }
+            } catch (Error e) {
+                warning("Failed to open file dialog: %s", e.message);
+            }
+        });
+    }
+
+    private void on_message_paste_clipboard() {
+        var display = get_display();
+        if (display == null) {
+            return;
+        }
+
+        var clipboard = display.get_clipboard();
+        if (clipboard == null) {
+            return;
+        }
+
+        clipboard.read_texture_async.begin(null, (obj, res) => {
+            try {
+                var clip = obj as Gdk.Clipboard;
+                var texture = clip.read_texture_async.end(res);
+                if (texture != null) {
+                    string tmp_path = Path.build_filename(Environment.get_tmp_dir(), "clipboard-" + Uuid.string_random() + ".png");
+                    texture.save_to_png(tmp_path);
+                    var tmp_file = File.new_for_path(tmp_path);
+                    upload_file(tmp_file);
+                }
+            } catch (Error e) {
+                // Ignore if clipboard does not contain image
+            }
+        });
+    }
 }
 
 class UploadedAttachment