Refactor file receive/send interfaces and UI

5 files changed, 327 insertions, 158 deletions

diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
index 278f3360..e2c929a1 100644
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@@ -111,6 +111,7 @@ SOURCES
     src/ui/conversation_summary/conversation_item_skeleton.vala
     src/ui/conversation_summary/conversation_view.vala
     src/ui/conversation_summary/date_separator_populator.vala
+    src/ui/conversation_summary/file_widget.vala
     src/ui/conversation_summary/subscription_notification.vala
     src/ui/conversation_titlebar/menu_entry.vala
     src/ui/conversation_titlebar/occupants_entry.vala
diff --git a/main/data/theme.css b/main/data/theme.css
index 8a1b50ad..d1e41d5b 100644
--- a/main/data/theme.css
+++ b/main/data/theme.css
@@ -47,6 +47,20 @@ window.dino-main .dino-sidebar > frame {
     border-bottom: 1px solid @borders;
 }
 
+.message-box {
+    transition: background .05s ease;
+}
+
+.file-box-outer {
+    background: @theme_base_color;
+    border-radius: 3px;
+    border: 1px solid alpha(@theme_fg_color, 0.1);
+}
+
+.file-box {
+    margin: 12px;
+}
+
 window.dino-main .dino-sidebar > frame.collapsed {
     border-bottom: 1px solid @borders;
 }
diff --git a/main/src/ui/conversation_selector/conversation_selector.vala b/main/src/ui/conversation_selector/conversation_selector.vala
index 290e297f..66cb3495 100644
--- a/main/src/ui/conversation_selector/conversation_selector.vala
+++ b/main/src/ui/conversation_selector/conversation_selector.vala
@@ -11,7 +11,6 @@ public class ConversationSelector : ListBox {
     public signal void conversation_selected(Conversation conversation);
 
     private StreamInteractor stream_interactor;
-    private string[]? filter_values;
     private HashMap<Conversation, ConversationSelectorRow> rows = new HashMap<Conversation, ConversationSelectorRow>(Conversation.hash_func, Conversation.equals_func);
 
     public ConversationSelector init(StreamInteractor stream_interactor) {
@@ -19,8 +18,7 @@ public class ConversationSelector : ListBox {
 
         stream_interactor.get_module(ConversationManager.IDENTITY).conversation_activated.connect(add_conversation);
         stream_interactor.get_module(ConversationManager.IDENTITY).conversation_deactivated.connect(remove_conversation);
-        stream_interactor.get_module(MessageProcessor.IDENTITY).message_received.connect(on_message_received);
-        stream_interactor.get_module(MessageProcessor.IDENTITY).message_sent.connect(on_message_received);
+        stream_interactor.get_module(ContentItemStore.IDENTITY).new_item.connect(on_content_item_received);
         Timeout.add_seconds(60, () => {
             foreach (ConversationSelectorRow row in rows.values) row.update();
             return true;
@@ -34,7 +32,6 @@ public class ConversationSelector : ListBox {
 
     construct {
         get_style_context().add_class("sidebar");
-        set_filter_func(filter);
         set_header_func(header);
         set_sort_func(sort);
 
@@ -54,14 +51,6 @@ public class ConversationSelector : ListBox {
         }
     }
 
-    public void set_filter_values(string[]? values) {
-        if (filter_values == values) {
-            return;
-        }
-        filter_values = values;
-        invalidate_filter();
-    }
-
     public void on_conversation_selected(Conversation conversation) {
         if (!rows.has_key(conversation)) {
             add_conversation(conversation);
@@ -70,7 +59,7 @@ public class ConversationSelector : ListBox {
         this.select_row(rows[conversation]);
     }
 
-    private void on_message_received(Entities.Message message, Conversation conversation) {
+    private void on_content_item_received(ContentItem item, Conversation conversation) {
         if (rows.has_key(conversation)) {
             invalidate_sort();
         }
@@ -128,21 +117,6 @@ public class ConversationSelector : ListBox {
         }
     }
 
-    private bool filter(ListBoxRow r) {
-        ConversationSelectorRow? row = r as ConversationSelectorRow;
-        if (row != null) {
-            if (filter_values != null && filter_values.length != 0) {
-                foreach (string filter in filter_values) {
-                    if (!(Util.get_conversation_display_name(stream_interactor, row.conversation).down().contains(filter.down()) ||
-                            row.conversation.counterpart.to_string().down().contains(filter.down()))) {
-                        return false;
-                    }
-                }
-            }
-        }
-        return true;
-    }
-
     private int sort(ListBoxRow row1, ListBoxRow row2) {
         ConversationSelectorRow cr1 = row1 as ConversationSelectorRow;
         ConversationSelectorRow cr2 = row2 as ConversationSelectorRow;
diff --git a/main/src/ui/conversation_summary/content_item_widget_factory.vala b/main/src/ui/conversation_summary/content_item_widget_factory.vala
index 2415eb38..533b2af1 100644
--- a/main/src/ui/conversation_summary/content_item_widget_factory.vala
+++ b/main/src/ui/conversation_summary/content_item_widget_factory.vala
@@ -108,136 +108,7 @@ public class FileItemWidgetGenerator : WidgetGenerator, Object {
         FileItem file_item = item as FileItem;
         FileTransfer transfer = file_item.file_transfer;
 
-        if (transfer.mime_type != null) {
-            foreach (PixbufFormat pixbuf_format in Pixbuf.get_formats()) {
-                foreach (string mime_type in pixbuf_format.get_mime_types()) {
-                    if (mime_type == transfer.mime_type)
-                        return getImageWidget(transfer);
-                    }
-            }
-        }
-
-        return getDefaultWidget(transfer);
-    }
-
-    private Widget getImageWidget(FileTransfer file_transfer) {
-        Image image = new Image() { halign=Align.START, visible = true };
-        Gdk.Pixbuf pixbuf;
-        try {
-            pixbuf = new Gdk.Pixbuf.from_file(file_transfer.get_file().get_path());
-        } catch (Error error) {
-            return null;
-        }
-
-        pixbuf = pixbuf.apply_embedded_orientation();
-
-        int max_scaled_height = MAX_HEIGHT * image.scale_factor;
-        if (pixbuf.height > max_scaled_height) {
-            pixbuf = pixbuf.scale_simple((int) ((double) max_scaled_height / pixbuf.height * pixbuf.width), max_scaled_height, Gdk.InterpType.BILINEAR);
-        }
-        int max_scaled_width = MAX_WIDTH * image.scale_factor;
-        if (pixbuf.width > max_scaled_width) {
-            pixbuf = pixbuf.scale_simple(max_scaled_width, (int) ((double) max_scaled_width / pixbuf.width * pixbuf.height), Gdk.InterpType.BILINEAR);
-        }
-        pixbuf = crop_corners(pixbuf, 3 * image.get_scale_factor());
-        Util.image_set_from_scaled_pixbuf(image, pixbuf);
-        Util.force_css(image, "* { box-shadow: 0px 0px 2px 0px rgba(0,0,0,0.1); margin: 2px; border-radius: 3px; }");
-
-        Builder builder = new Builder.from_resource("/im/dino/Dino/conversation_summary/image_toolbar.ui");
-        Widget toolbar = builder.get_object("main") as Widget;
-        Util.force_background(toolbar, "rgba(0, 0, 0, 0.5)");
-        Util.force_css(toolbar, "* { padding: 3px; border-radius: 3px; }");
-
-        Label url_label = builder.get_object("url_label") as Label;
-        Util.force_color(url_label, "#eee");
-
-        if (file_transfer.file_name != null && file_transfer.file_name != "") {
-            string caption = file_transfer.file_name;
-            url_label.label = caption;
-        } else {
-            url_label.visible = false;
-        }
-
-        Image open_image = builder.get_object("open_image") as Image;
-        Util.force_css(open_image, "*:not(:hover) { color: #eee; }");
-        Button open_button = builder.get_object("open_button") as Button;
-        Util.force_css(open_button, "*:hover { background-color: rgba(255,255,255,0.3); border-color: transparent; }");
-        open_button.clicked.connect(() => {
-            try{
-                AppInfo.launch_default_for_uri(file_transfer.get_file().get_uri(), null);
-            } catch (Error err) {
-                info("Could not to open file://%s: %s", file_transfer.get_file().get_path(), err.message);
-            }
-        });
-
-        Revealer toolbar_revealer = new Revealer() { transition_type=RevealerTransitionType.CROSSFADE, transition_duration=400, visible=true };
-        toolbar_revealer.add(toolbar);
-
-        Grid grid = new Grid() { visible=true };
-        grid.attach(toolbar_revealer, 0, 0, 1, 1);
-        grid.attach(image, 0, 0, 1, 1);
-
-        EventBox event_box = new EventBox() { halign=Align.START, visible=true };
-        event_box.events = EventMask.POINTER_MOTION_MASK;
-        event_box.add(grid);
-        event_box.enter_notify_event.connect(() => { toolbar_revealer.reveal_child = true; return false; });
-        event_box.leave_notify_event.connect(() => { toolbar_revealer.reveal_child = false; return false; });
-
-        return event_box;
-    }
-
-    private static Gdk.Pixbuf crop_corners(Gdk.Pixbuf pixbuf, double radius = 3) {
-        Cairo.Context ctx = new Cairo.Context(new Cairo.ImageSurface(Cairo.Format.ARGB32, pixbuf.width, pixbuf.height));
-        Gdk.cairo_set_source_pixbuf(ctx, pixbuf, 0, 0);
-        double degrees = Math.PI / 180.0;
-        ctx.new_sub_path();
-        ctx.arc(pixbuf.width - radius, radius, radius, -90 * degrees, 0 * degrees);
-        ctx.arc(pixbuf.width - radius, pixbuf.height - radius, radius, 0 * degrees, 90 * degrees);
-        ctx.arc(radius, pixbuf.height - radius, radius, 90 * degrees, 180 * degrees);
-        ctx.arc(radius, radius, radius, 180 * degrees, 270 * degrees);
-        ctx.close_path();
-        ctx.clip();
-        ctx.paint();
-        return Gdk.pixbuf_get_from_surface(ctx.get_target(), 0, 0, pixbuf.width, pixbuf.height);
-    }
-
-    private Widget getDefaultWidget(FileTransfer file_transfer) {
-        Box main_box = new Box(Orientation.HORIZONTAL, 4) { halign=Align.START, visible=true };
-        string? icon_name = file_transfer.mime_type != null ? ContentType.get_generic_icon_name(file_transfer.mime_type) : null;
-        Image content_type_image = new Image.from_icon_name(icon_name, IconSize.DND) { visible=true };
-        main_box.add(content_type_image);
-
-        Box right_box = new Box(Orientation.VERTICAL, 0) { visible=true };
-        Label name_label = new Label(file_transfer.file_name) { ellipsize=EllipsizeMode.END, xalign=0, yalign=0, visible=true};
-        right_box.add(name_label);
-        Label mime_label = new Label("<span size='small'>" + _("File") + ": " + file_transfer.mime_type + "</span>") { use_markup=true, xalign=0, yalign=1, visible=true};
-        mime_label.get_style_context().add_class("dim-label");
-        right_box.add(mime_label);
-        main_box.add(right_box);
-
-        EventBox event_box = new EventBox() { halign=Align.START, visible=true };
-        event_box.add(main_box);
-
-        event_box.enter_notify_event.connect((event) => {
-            event.get_window().set_cursor(new Cursor.for_display(Gdk.Display.get_default(), CursorType.HAND2));
-            return false;
-        });
-        event_box.leave_notify_event.connect((event) => {
-            event.get_window().set_cursor(new Cursor.for_display(Gdk.Display.get_default(), CursorType.XTERM));
-            return false;
-        });
-        event_box.button_release_event.connect((event_button) => {
-            if (event_button.button == 1) {
-                try{
-                    AppInfo.launch_default_for_uri(file_transfer.get_file().get_uri(), null);
-                } catch (Error err) {
-                    print("Tried to open " + file_transfer.get_file().get_path());
-                }
-            }
-            return false;
-        });
-
-        return event_box;
+        return new FileWidget(stream_interactor, transfer) { visible=true };
     }
 }
 
diff --git a/main/src/ui/conversation_summary/file_widget.vala b/main/src/ui/conversation_summary/file_widget.vala
new file mode 100644
index 00000000..19b89906
--- /dev/null
+++ b/main/src/ui/conversation_summary/file_widget.vala
@@ -0,0 +1,309 @@
+using Gee;
+using Gdk;
+using Gtk;
+using Pango;
+
+using Dino.Entities;
+
+namespace Dino.Ui.ConversationSummary {
+
+public class FileWidget : Box {
+
+    enum State {
+        IMAGE,
+        DEFAULT
+    }
+
+    private const int MAX_HEIGHT = 300;
+    private const int MAX_WIDTH = 600;
+
+    private StreamInteractor stream_interactor;
+    private FileTransfer file_transfer;
+    private State state;
+
+    // default box
+    private Box main_box;
+    private string? icon_name;
+    private Image content_type_image;
+    private Image download_image;
+    private Spinner spinner;
+    private Label mime_label;
+    private Stack image_stack;
+
+    private Widget content;
+
+    private bool pointer_inside = false;
+
+    public FileWidget(StreamInteractor stream_interactor, FileTransfer file_transfer) {
+        this.stream_interactor = stream_interactor;
+        this.file_transfer = file_transfer;
+
+        if (show_image()) {
+            content =  getImageWidget(file_transfer);
+            if (content != null) {
+                this.state = State.IMAGE;
+                this.add(content);
+                return;
+            }
+        }
+
+        content = getDefaultWidget(file_transfer);
+        this.state = State.DEFAULT;
+        this.add(content);
+    }
+
+    private Widget? getImageWidget(FileTransfer file_transfer) {
+        Image image = new Image() { halign=Align.START, visible = true };
+        Gdk.Pixbuf pixbuf;
+        try {
+            pixbuf = new Gdk.Pixbuf.from_file(file_transfer.get_file().get_path());
+        } catch (Error error) {
+            warning("Can't load picture %s", file_transfer.get_file().get_path());
+            return null;
+        }
+
+        pixbuf = pixbuf.apply_embedded_orientation();
+
+        int max_scaled_height = MAX_HEIGHT * image.scale_factor;
+        if (pixbuf.height > max_scaled_height) {
+            pixbuf = pixbuf.scale_simple((int) ((double) max_scaled_height / pixbuf.height * pixbuf.width), max_scaled_height, Gdk.InterpType.BILINEAR);
+        }
+        int max_scaled_width = MAX_WIDTH * image.scale_factor;
+        if (pixbuf.width > max_scaled_width) {
+            pixbuf = pixbuf.scale_simple(max_scaled_width, (int) ((double) max_scaled_width / pixbuf.width * pixbuf.height), Gdk.InterpType.BILINEAR);
+        }
+        pixbuf = crop_corners(pixbuf, 3 * image.get_scale_factor());
+        Util.image_set_from_scaled_pixbuf(image, pixbuf);
+        Util.force_css(image, "* { box-shadow: 0px 0px 2px 0px rgba(0,0,0,0.1); margin: 2px; border-radius: 3px; }");
+
+        Builder builder = new Builder.from_resource("/im/dino/Dino/conversation_summary/image_toolbar.ui");
+        Widget toolbar = builder.get_object("main") as Widget;
+        Util.force_background(toolbar, "rgba(0, 0, 0, 0.5)");
+        Util.force_css(toolbar, "* { padding: 3px; border-radius: 3px; }");
+
+        Label url_label = builder.get_object("url_label") as Label;
+        Util.force_color(url_label, "#eee");
+
+        if (file_transfer.file_name != null && file_transfer.file_name != "") {
+            string caption = file_transfer.file_name;
+            url_label.label = caption;
+        } else {
+            url_label.visible = false;
+        }
+
+        Image open_image = builder.get_object("open_image") as Image;
+        Util.force_css(open_image, "*:not(:hover) { color: #eee; }");
+        Button open_button = builder.get_object("open_button") as Button;
+        Util.force_css(open_button, "*:hover { background-color: rgba(255,255,255,0.3); border-color: transparent; }");
+        open_button.clicked.connect(() => {
+            try{
+                AppInfo.launch_default_for_uri(file_transfer.get_file().get_uri(), null);
+            } catch (Error err) {
+                info("Could not to open file://%s: %s", file_transfer.get_file().get_path(), err.message);
+            }
+        });
+
+        Revealer toolbar_revealer = new Revealer() { transition_type=RevealerTransitionType.CROSSFADE, transition_duration=400, visible=true };
+        toolbar_revealer.add(toolbar);
+
+        Grid grid = new Grid() { visible=true };
+        grid.attach(toolbar_revealer, 0, 0, 1, 1);
+        grid.attach(image, 0, 0, 1, 1);
+
+        EventBox event_box = new EventBox() { margin_top=5, halign=Align.START, visible=true };
+        event_box.events = EventMask.POINTER_MOTION_MASK;
+        event_box.add(grid);
+        event_box.enter_notify_event.connect(() => { toolbar_revealer.reveal_child = true; return false; });
+        event_box.leave_notify_event.connect(() => { toolbar_revealer.reveal_child = false; return false; });
+
+        return event_box;
+    }
+
+    private static Gdk.Pixbuf crop_corners(Gdk.Pixbuf pixbuf, double radius = 3) {
+        Cairo.Context ctx = new Cairo.Context(new Cairo.ImageSurface(Cairo.Format.ARGB32, pixbuf.width, pixbuf.height));
+        Gdk.cairo_set_source_pixbuf(ctx, pixbuf, 0, 0);
+        double degrees = Math.PI / 180.0;
+        ctx.new_sub_path();
+        ctx.arc(pixbuf.width - radius, radius, radius, -90 * degrees, 0 * degrees);
+        ctx.arc(pixbuf.width - radius, pixbuf.height - radius, radius, 0 * degrees, 90 * degrees);
+        ctx.arc(radius, pixbuf.height - radius, radius, 90 * degrees, 180 * degrees);
+        ctx.arc(radius, radius, radius, 180 * degrees, 270 * degrees);
+        ctx.close_path();
+        ctx.clip();
+        ctx.paint();
+        return Gdk.pixbuf_get_from_surface(ctx.get_target(), 0, 0, pixbuf.width, pixbuf.height);
+    }
+
+    private Widget getDefaultWidget(FileTransfer file_transfer) {
+        main_box = new Box(Orientation.HORIZONTAL, 4) { halign=Align.FILL, hexpand=true, visible=true };
+        icon_name = ContentType.get_generic_icon_name(file_transfer.mime_type ?? "application/octet-stream");
+        content_type_image = new Image.from_icon_name(icon_name + "-symbolic", IconSize.DND) { visible=true };
+        download_image = new Image.from_icon_name("folder-download-symbolic", IconSize.MENU) { visible=true };
+        spinner = new Spinner() { active=true, visible=true };
+
+        EventBox stack_event_box = new EventBox() { visible=true };
+        image_stack = new Stack() { transition_type = StackTransitionType.CROSSFADE, transition_duration=50, valign=Align.CENTER, visible=true };
+        image_stack.add_named(download_image, "download_image");
+        image_stack.add_named(spinner, "spinner");
+        image_stack.add_named(content_type_image, "content_type_image");
+        stack_event_box.add(image_stack);
+
+        main_box.add(stack_event_box);
+
+        Box right_box = new Box(Orientation.VERTICAL, 0) { hexpand=true, visible=true };
+        Label name_label = new Label(file_transfer.file_name) { ellipsize=EllipsizeMode.MIDDLE, max_width_chars=1, hexpand=true, xalign=0, yalign=0, visible=true};
+        right_box.add(name_label);
+
+        EventBox mime_label_event_box = new EventBox() { visible=true };
+        mime_label = new Label("") { use_markup=true, xalign=0, yalign=1, visible=true};
+
+        mime_label_event_box.add(mime_label);
+        mime_label.get_style_context().add_class("dim-label");
+
+        right_box.add(mime_label_event_box);
+        main_box.add(right_box);
+
+        EventBox event_box = new EventBox() { margin_top=5, width_request=500, halign=Align.START, visible=true };
+        event_box.get_style_context().add_class("file-box-outer");
+        event_box.add(main_box);
+        main_box.get_style_context().add_class("file-box");
+
+        event_box.enter_notify_event.connect((event) => {
+            pointer_inside = true;
+            Timeout.add(20, () => {
+                if (pointer_inside) {
+                    event.get_window().set_cursor(new Cursor.for_display(Gdk.Display.get_default(), CursorType.HAND2));
+                    if (file_transfer.state == FileTransfer.State.NOT_STARTED) {
+                        image_stack.set_visible_child_name("download_image");
+                    } else if (file_transfer.state == FileTransfer.State.COMPLETE) {
+                        content_type_image.opacity = 1;
+                    }
+                }
+                return false;
+            });
+            return false;
+        });
+        stack_event_box.enter_notify_event.connect((event) => { pointer_inside = true; return false; });
+        mime_label_event_box.enter_notify_event.connect((event) => { pointer_inside = true; return false; });
+        mime_label.enter_notify_event.connect((event) => { pointer_inside = true; return false; });
+        event_box.leave_notify_event.connect((event) => {
+            pointer_inside = false;
+            Timeout.add(20, () => {
+                if (!pointer_inside) {
+                    event.get_window().set_cursor(new Cursor.for_display(Gdk.Display.get_default(), CursorType.XTERM));
+                    if (file_transfer.state == FileTransfer.State.NOT_STARTED) {
+                        image_stack.set_visible_child_name("content_type_image");
+                    } else if (file_transfer.state == FileTransfer.State.COMPLETE) {
+                        content_type_image.opacity = 0.5;
+                    }
+                }
+                return false;
+            });
+            return false;
+        });
+        stack_event_box.leave_notify_event.connect((event) => { pointer_inside = true; return false; });
+        mime_label_event_box.leave_notify_event.connect((event) => { pointer_inside = true; return false; });
+        mime_label.leave_notify_event.connect((event) => { pointer_inside = true; return false; });
+        event_box.button_release_event.connect((event_button) => {
+            switch (file_transfer.state) {
+                case FileTransfer.State.COMPLETE:
+                    if (event_button.button == 1) {
+                        try{
+                            AppInfo.launch_default_for_uri(file_transfer.get_file().get_uri(), null);
+                        } catch (Error err) {
+                            print("Tried to open " + file_transfer.get_file().get_path());
+                        }
+                    }
+                    break;
+                case FileTransfer.State.NOT_STARTED:
+                    stream_interactor.get_module(FileManager.IDENTITY).download_file.begin(file_transfer);
+                    break;
+            }
+            return false;
+        });
+
+        main_box.events = EventMask.POINTER_MOTION_MASK;
+        content_type_image.events = EventMask.POINTER_MOTION_MASK;
+        download_image.events = EventMask.POINTER_MOTION_MASK;
+        spinner.events = EventMask.POINTER_MOTION_MASK;
+        image_stack.events = EventMask.POINTER_MOTION_MASK;
+        right_box.events = EventMask.POINTER_MOTION_MASK;
+        name_label.events = EventMask.POINTER_MOTION_MASK;
+        mime_label.events = EventMask.POINTER_MOTION_MASK;
+        event_box.events = EventMask.POINTER_MOTION_MASK;
+        mime_label.events = EventMask.POINTER_MOTION_MASK;
+        mime_label_event_box.events = EventMask.POINTER_MOTION_MASK;
+
+        file_transfer.notify["path"].connect(update_file_info);
+        file_transfer.notify["state"].connect(update_file_info);
+        file_transfer.notify["mime-type"].connect(update_file_info);
+        update_file_info();
+
+        return event_box;
+    }
+
+    private void update_file_info() {
+        if (file_transfer.state == FileTransfer.State.COMPLETE && show_image() && state != State.IMAGE) {
+            this.remove(content);
+            this.add(getImageWidget(file_transfer));
+            state = State.IMAGE;
+        }
+
+        content_type_image.opacity = 0.5;
+
+        var mime_split = (file_transfer.mime_type ?? "").split("/");
+        var mime_caps = mime_split.length == 2 ? mime_split[1].up() : file_transfer.mime_type;
+
+        switch (file_transfer.state) {
+            case FileTransfer.State.COMPLETE:
+                mime_label.label = "<span size='small'>" + _("%s file").printf(mime_caps) + "</span>";
+                image_stack.set_visible_child_name("content_type_image");
+                break;
+            case FileTransfer.State.IN_PROGRESS:
+                mime_label.label = "<span size='small'>" + _("Downloading %s…").printf(get_size_string(file_transfer.size)) + "</span>";
+                image_stack.set_visible_child_name("spinner");
+                break;
+            case FileTransfer.State.NOT_STARTED:
+                if (mime_caps != null) {
+                    mime_label.label = "<span size='small'>" + _("%s file offered: %s").printf(mime_caps, get_size_string(file_transfer.size)) + "</span>";
+                } else if (file_transfer.size != -1) {
+                    mime_label.label = "<span size='small'>" + _("File offered: %s").printf(get_size_string(file_transfer.size)) + "</span>";
+                } else {
+                    mime_label.label = "<span size='small'>" + _("File offered") + "</span>";
+                }
+                image_stack.set_visible_child_name("content_type_image");
+                break;
+            case FileTransfer.State.FAILED:
+                mime_label.label = "<span size='small' foreground=\"#f44336\">" + _("File transfer failed") + "</span>";
+                image_stack.set_visible_child_name("content_type_image");
+                break;
+        }
+    }
+
+    private static string get_size_string(int size) {
+        if (size < 1024) {
+            return @"$(size) B";
+        } else if (size < 1000 * 1000) {
+            return @"$(size / 1000) kB";
+        } else if (size < 1000 * 1000 * 1000) {
+            return @"$(size / 1000  / 1000) MB";
+        } else {
+            return @"$(size  / 1000  / 1000  / 1000) GB";
+        }
+    }
+
+    private bool show_image() {
+        if (file_transfer.mime_type == null || file_transfer.state != FileTransfer.State.COMPLETE) return false;
+
+        foreach (PixbufFormat pixbuf_format in Pixbuf.get_formats()) {
+            foreach (string mime_type in pixbuf_format.get_mime_types()) {
+                if (mime_type == file_transfer.mime_type) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}
+
+}