feat(overlay): add position customization for overlay placement

- Introduce PositionX and PositionY fields in OverlaySettings to allow manual positioning of the overlay.
- Update validation to ensure PositionX and PositionY are not less than -1.
- Modify diskConfig to include new position fields for JSON serialization.
- Implement functionality to save overlay position during drag events in the GUI.
- Enhance overlay placement logic to respect user-defined positions while ensuring proper display behavior.

src/config/config.go

@@ -76,6 +76,10 @@ type OverlaySettings struct {
 	Monitor      string
 	FinalTimeout time.Duration
 	ClickThrough bool
+	// PositionX/PositionY are monitor-local logical pixels. -1 means automatic
+	// placement (horizontally centered, BottomMargin above the bottom edge).
+	PositionX int
+	PositionY int
 }
 
 func DefaultOverlaySettings() OverlaySettings {
@@ -89,6 +93,8 @@ func DefaultOverlaySettings() OverlaySettings {
 		Monitor:      "auto",
 		FinalTimeout: MinimumOverlayFinalLifetime,
 		ClickThrough: true,
+		PositionX:    -1,
+		PositionY:    -1,
 	}
 }
 
@@ -202,6 +208,12 @@ func (s OverlaySettings) Validate() error {
 	if s.Monitor == "" {
 		return errors.New("--overlay-monitor cannot be empty")
 	}
+	if s.PositionX < -1 {
+		return errors.New("overlay position x cannot be less than -1")
+	}
+	if s.PositionY < -1 {
+		return errors.New("overlay position y cannot be less than -1")
+	}
 	return nil
 }
 

src/config/store.go

@@ -44,6 +44,8 @@ type diskConfig struct {
 		Monitor      string         `json:"monitor"`
 		FinalTimeout string         `json:"final_timeout"`
 		ClickThrough bool           `json:"click_through"`
+		PositionX    *int           `json:"position_x,omitempty"`
+		PositionY    *int           `json:"position_y,omitempty"`
 	} `json:"overlay"`
 	TranscriptLog struct {
 		Enabled   bool   `json:"enabled"`
@@ -163,6 +165,10 @@ func diskFromConfig(config AppConfig) diskConfig {
 	disk.Overlay.Monitor = config.Overlay.Monitor
 	disk.Overlay.FinalTimeout = config.Overlay.FinalTimeout.String()
 	disk.Overlay.ClickThrough = config.Overlay.ClickThrough
+	positionX := config.Overlay.PositionX
+	positionY := config.Overlay.PositionY
+	disk.Overlay.PositionX = &positionX
+	disk.Overlay.PositionY = &positionY
 	disk.TranscriptLog.Enabled = config.TranscriptLog.Enabled
 	disk.TranscriptLog.Directory = config.TranscriptLog.Directory
 	return disk
@@ -185,6 +191,13 @@ func (disk diskConfig) toConfig() (AppConfig, error) {
 	if err != nil {
 		return AppConfig{}, err
 	}
+	positionX, positionY := -1, -1
+	if disk.Overlay.PositionX != nil {
+		positionX = *disk.Overlay.PositionX
+	}
+	if disk.Overlay.PositionY != nil {
+		positionY = *disk.Overlay.PositionY
+	}
 	return AppConfig{
 		Version: disk.Version,
 		GUI: GUISettings{
@@ -218,6 +231,8 @@ func (disk diskConfig) toConfig() (AppConfig, error) {
 			Monitor:      disk.Overlay.Monitor,
 			FinalTimeout: finalTimeout,
 			ClickThrough: disk.Overlay.ClickThrough,
+			PositionX:    positionX,
+			PositionY:    positionY,
 		},
 		TranscriptLog: TranscriptLogSettings{
 			Enabled:   disk.TranscriptLog.Enabled,

src/gui/app.go

@@ -143,13 +143,16 @@ func (a *Application) activate() {
 	a.buildWindow()
 	a.installActions()
 	a.subscribeModels()
+	overlay.SetPositionSaver(a.saveOverlayPosition)
 	if a.launch.Warning != nil {
 		a.log.Add(diagnostics.Warning, "configuration", fmt.Sprintf("%v; using built-in defaults", a.launch.Warning))
 	}
+	// Show the main window before creating the overlay so a Layer Shell /
+	// display failure cannot leave the user with a silent no-GUI launch.
+	a.window.Present()
 	if err := a.configureOutputs(a.config, true); err != nil {
 		a.log.Add(diagnostics.Error, "outputs", err.Error())
 	}
-	a.window.Present()
 	a.applyAlwaysOnTop(a.config.GUI.MainWindowAlwaysOnTop)
 	if a.config.GUI.StartCaptions {
 		a.startCaptions()
@@ -395,6 +398,18 @@ func (a *Application) restartCaptions() {
 	}()
 }
 
+func (a *Application) saveOverlayPosition(x, y int) {
+	a.config.Overlay.PositionX = x
+	a.config.Overlay.PositionY = y
+	a.applied.Overlay.PositionX = x
+	a.applied.Overlay.PositionY = y
+	if err := config.Save(a.launch.Path, a.config); err != nil {
+		a.log.Add(diagnostics.Error, "configuration", fmt.Sprintf("Save overlay position: %v", err))
+		return
+	}
+	a.log.Add(diagnostics.Info, "overlay", fmt.Sprintf("Saved caption position (%d, %d)", x, y))
+}
+
 func (a *Application) configureOutputs(next config.AppConfig, initial bool) error {
 	var outputErr error
 	a.history.SetEnabled(next.Outputs.History)

src/gui/settings.go

@@ -170,7 +170,7 @@ func (a *Application) overlaySettingsPage() *gtk.ScrolledWindow {
 	box.Append(settingRow("Maximum width", "Maximum overlay width in pixels.", a.settings.overlayMaxWidth))
 	box.Append(settingRow("Monitor", "Use auto or the configured monitor connector/name.", a.settings.overlayMonitor))
 	box.Append(settingRow("Final caption lifetime", "Zero keeps final text visible; otherwise use 3s or longer.", a.settings.overlayFinalTimeout))
-	box.Append(settingRow("Click through overlay", "Allow pointer input to pass through the caption surface.", a.settings.overlayClickThrough))
+	box.Append(settingRow("Click through overlay", "Pass pointer input through empty areas. Hold Ctrl and drag the caption bubble to reposition it; the spot is remembered.", a.settings.overlayClickThrough))
 	return settingsScroller(box)
 }
 
@@ -272,6 +272,8 @@ func (a *Application) readSettings() (config.AppConfig, error) {
 			Monitor:      strings.TrimSpace(a.settings.overlayMonitor.Text()),
 			FinalTimeout: finalTimeout,
 			ClickThrough: a.settings.overlayClickThrough.Active(),
+			PositionX:    a.config.Overlay.PositionX,
+			PositionY:    a.config.Overlay.PositionY,
 		},
 		TranscriptLog: config.TranscriptLogSettings{
 			Enabled:   a.settings.transcriptEnabled.Active(),

src/output/overlay/overlay_gtk.go

@@ -33,6 +33,16 @@ typedef struct {
 	gboolean final_visible;
 	gboolean preview_visible;
 	gboolean x11;
+	gboolean layer_shell;
+	gboolean click_through;
+	gboolean dragging;
+	int bottom_margin;
+	int position_x;
+	int position_y;
+	double drag_start_px;
+	double drag_start_py;
+	int drag_origin_x;
+	int drag_origin_y;
 } CaptioneerOverlay;
 
 typedef struct {
@@ -41,6 +51,9 @@ typedef struct {
 	char *preview_text;
 } CaptioneerUpdate;
 
+// Implemented on the Go side via //export so drag placement can be persisted.
+extern void captioneerOverlayPositionChanged(int x, int y);
+
 static void captioneer_append_warning(GString *warnings, const char *message) {
 	if (warnings->len > 0) {
 		g_string_append(warnings, " ");
@@ -126,15 +139,198 @@ static GdkMonitor *captioneer_select_monitor(
 	return monitor;
 }
 
-static void captioneer_set_input_passthrough(CaptioneerOverlay *overlay, GString *warnings) {
-	if (!gdk_display_supports_input_shapes(gtk_widget_get_display(GTK_WIDGET(overlay->window)))) {
-		captioneer_append_warning(warnings, "This display backend does not support pointer click-through.");
+static GdkMonitor *captioneer_overlay_monitor(CaptioneerOverlay *overlay) {
+	if (overlay->monitor != NULL) {
+		return overlay->monitor;
+	}
+	GdkDisplay *display = gtk_widget_get_display(GTK_WIDGET(overlay->window));
+	GdkSurface *surface = gtk_native_get_surface(GTK_NATIVE(overlay->window));
+	if (surface != NULL) {
+		GdkMonitor *monitor = gdk_display_get_monitor_at_surface(display, surface);
+		if (monitor != NULL) {
+			return monitor;
+		}
+	}
+	return captioneer_monitor_by_index(display, 0);
+}
+
+static void captioneer_update_input_region(CaptioneerOverlay *overlay) {
+	GdkSurface *surface = gtk_native_get_surface(GTK_NATIVE(overlay->window));
+	if (surface == NULL) {
+		return;
+	}
+	if (!overlay->click_through || overlay->dragging) {
+		gdk_surface_set_input_region(surface, NULL);
+		return;
+	}
+	// Limit hit-testing to the caption bubble so the transparent full-width
+	// chrome stays click-through. CTRL+drag still works because clicks that
+	// land on the bubble include modifier state.
+	int bubble_width = gtk_widget_get_width(overlay->bubble);
+	int bubble_height = gtk_widget_get_height(overlay->bubble);
+	if (bubble_width <= 0 || bubble_height <= 0) {
+		cairo_region_t *empty = cairo_region_create();
+		gdk_surface_set_input_region(surface, empty);
+		cairo_region_destroy(empty);
+		return;
+	}
+	double native_x = 0, native_y = 0;
+	if (!gtk_widget_translate_coordinates(overlay->bubble, GTK_WIDGET(overlay->window), 0, 0, &native_x, &native_y)) {
+		native_x = 0;
+		native_y = 0;
+	}
+	cairo_rectangle_int_t rect = {
+		.x = (int)native_x,
+		.y = (int)native_y,
+		.width = bubble_width,
+		.height = bubble_height,
+	};
+	cairo_region_t *region = cairo_region_create_rectangle(&rect);
+	gdk_surface_set_input_region(surface, region);
+	cairo_region_destroy(region);
+}
+
+static void captioneer_apply_placement(CaptioneerOverlay *overlay) {
+	GdkSurface *surface = gtk_native_get_surface(GTK_NATIVE(overlay->window));
+	if (surface == NULL) {
+		return;
+	}
+	GdkMonitor *monitor = captioneer_overlay_monitor(overlay);
+	if (monitor == NULL) {
+		return;
+	}
+	GdkRectangle geometry;
+	gdk_monitor_get_geometry(monitor, &geometry);
+	int width = gdk_surface_get_width(surface);
+	int height = gdk_surface_get_height(surface);
+	if (width <= 1 || height <= 1) {
+		return;
+	}
+
+	int x = overlay->position_x;
+	int y = overlay->position_y;
+	if (x < 0) {
+		x = (geometry.width - width) / 2;
+	}
+	if (y < 0) {
+		y = geometry.height - height - overlay->bottom_margin;
+	}
+	if (x < 0) {
+		x = 0;
+	}
+	if (y < 0) {
+		y = 0;
+	}
+	if (x + width > geometry.width) {
+		x = MAX(0, geometry.width - width);
+	}
+	if (y + height > geometry.height) {
+		y = MAX(0, geometry.height - height);
+	}
+
+	if (overlay->layer_shell) {
+		gtk_layer_set_anchor(overlay->window, GTK_LAYER_SHELL_EDGE_LEFT, TRUE);
+		gtk_layer_set_anchor(overlay->window, GTK_LAYER_SHELL_EDGE_TOP, TRUE);
+		gtk_layer_set_anchor(overlay->window, GTK_LAYER_SHELL_EDGE_RIGHT, FALSE);
+		gtk_layer_set_anchor(overlay->window, GTK_LAYER_SHELL_EDGE_BOTTOM, FALSE);
+		gtk_layer_set_margin(overlay->window, GTK_LAYER_SHELL_EDGE_LEFT, x);
+		gtk_layer_set_margin(overlay->window, GTK_LAYER_SHELL_EDGE_TOP, y);
+		gtk_layer_set_margin(overlay->window, GTK_LAYER_SHELL_EDGE_RIGHT, 0);
+		gtk_layer_set_margin(overlay->window, GTK_LAYER_SHELL_EDGE_BOTTOM, 0);
+	} else if (overlay->x11) {
+		Display *display = GDK_SURFACE_XDISPLAY(surface);
+		Window xid = GDK_SURFACE_XID(surface);
+		int root_x = geometry.x + x;
+		int root_y = geometry.y + y;
+		XSizeHints *size_hints = XAllocSizeHints();
+		if (size_hints != NULL) {
+			size_hints->flags = USPosition | PPosition;
+			size_hints->x = root_x;
+			size_hints->y = root_y;
+			XSetWMNormalHints(display, xid, size_hints);
+			XFree(size_hints);
+		}
+		XMoveWindow(display, xid, root_x, root_y);
+		XFlush(display);
+	}
+	captioneer_update_input_region(overlay);
+}
+
+static gboolean captioneer_reposition_x11(gpointer data) {
+	captioneer_apply_placement(data);
+	return G_SOURCE_REMOVE;
+}
+
+static void captioneer_surface_size_changed(GObject *object, GParamSpec *spec, gpointer data) {
+	(void)object;
+	(void)spec;
+	g_idle_add(captioneer_reposition_x11, data);
+}
+
+static gboolean captioneer_ctrl_held(GdkEvent *event) {
+	return (gdk_event_get_modifier_state(event) & GDK_CONTROL_MASK) != 0;
+}
+
+static void captioneer_drag_begin(GtkGestureDrag *gesture, double x, double y, gpointer data) {
+	(void)x;
+	(void)y;
+	CaptioneerOverlay *overlay = data;
+	GdkEvent *event = gtk_event_controller_get_current_event(GTK_EVENT_CONTROLLER(gesture));
+	if (event == NULL || !captioneer_ctrl_held(event)) {
+		gtk_gesture_set_state(GTK_GESTURE(gesture), GTK_EVENT_SEQUENCE_DENIED);
 		return;
 	}
 	GdkSurface *surface = gtk_native_get_surface(GTK_NATIVE(overlay->window));
-	cairo_region_t *empty = cairo_region_create();
-	gdk_surface_set_input_region(surface, empty);
-	cairo_region_destroy(empty);
+	if (surface == NULL) {
+		gtk_gesture_set_state(GTK_GESTURE(gesture), GTK_EVENT_SEQUENCE_DENIED);
+		return;
+	}
+	overlay->dragging = TRUE;
+	captioneer_update_input_region(overlay);
+	gtk_gesture_set_state(GTK_GESTURE(gesture), GTK_EVENT_SEQUENCE_CLAIMED);
+
+	GdkMonitor *monitor = captioneer_overlay_monitor(overlay);
+	GdkRectangle geometry = {0};
+	if (monitor != NULL) {
+		gdk_monitor_get_geometry(monitor, &geometry);
+	}
+	int width = gdk_surface_get_width(surface);
+	int height = gdk_surface_get_height(surface);
+	int origin_x = overlay->position_x;
+	int origin_y = overlay->position_y;
+	if (origin_x < 0) {
+		origin_x = (geometry.width - width) / 2;
+	}
+	if (origin_y < 0) {
+		origin_y = geometry.height - height - overlay->bottom_margin;
+	}
+	overlay->drag_origin_x = origin_x;
+	overlay->drag_origin_y = origin_y;
+	gtk_gesture_drag_get_start_point(gesture, &overlay->drag_start_px, &overlay->drag_start_py);
+}
+
+static void captioneer_drag_update(GtkGestureDrag *gesture, double offset_x, double offset_y, gpointer data) {
+	CaptioneerOverlay *overlay = data;
+	if (!overlay->dragging) {
+		return;
+	}
+	(void)gesture;
+	overlay->position_x = overlay->drag_origin_x + (int)offset_x;
+	overlay->position_y = overlay->drag_origin_y + (int)offset_y;
+	captioneer_apply_placement(overlay);
+}
+
+static void captioneer_drag_end(GtkGestureDrag *gesture, double offset_x, double offset_y, gpointer data) {
+	(void)gesture;
+	CaptioneerOverlay *overlay = data;
+	if (!overlay->dragging) {
+		return;
+	}
+	overlay->position_x = overlay->drag_origin_x + (int)offset_x;
+	overlay->position_y = overlay->drag_origin_y + (int)offset_y;
+	overlay->dragging = FALSE;
+	captioneer_apply_placement(overlay);
+	captioneerOverlayPositionChanged(overlay->position_x, overlay->position_y);
 }
 
 static void captioneer_apply_x11_hints(CaptioneerOverlay *overlay) {
@@ -177,51 +373,11 @@ static void captioneer_apply_x11_hints(CaptioneerOverlay *overlay) {
 	XFlush(display);
 }
 
-static gboolean captioneer_reposition_x11(gpointer data) {
-	CaptioneerOverlay *overlay = data;
-	if (!overlay->x11 || overlay->monitor == NULL) {
-		return G_SOURCE_REMOVE;
-	}
-	GdkSurface *surface = gtk_native_get_surface(GTK_NATIVE(overlay->window));
-	if (surface == NULL) {
-		return G_SOURCE_REMOVE;
-	}
-	GdkRectangle geometry;
-	gdk_monitor_get_geometry(overlay->monitor, &geometry);
-	int width = gdk_surface_get_width(surface);
-	int height = gdk_surface_get_height(surface);
-	if (width <= 1 || height <= 1) {
-		return G_SOURCE_REMOVE;
-	}
-	int bottom_margin = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(overlay->window), "bottom-margin"));
-	int x = geometry.x + (geometry.width - width) / 2;
-	int y = geometry.y + geometry.height - height - bottom_margin;
-	Display *display = GDK_SURFACE_XDISPLAY(surface);
-	Window xid = GDK_SURFACE_XID(surface);
-	XSizeHints *size_hints = XAllocSizeHints();
-	if (size_hints != NULL) {
-		size_hints->flags = USPosition | PPosition;
-		size_hints->x = x;
-		size_hints->y = y;
-		XSetWMNormalHints(display, xid, size_hints);
-		XFree(size_hints);
-	}
-	XMoveWindow(display, xid, x, y);
-	XFlush(display);
-	return G_SOURCE_REMOVE;
-}
-
-static void captioneer_surface_size_changed(GObject *object, GParamSpec *spec, gpointer data) {
-	(void)object;
-	(void)spec;
-	g_idle_add(captioneer_reposition_x11, data);
-}
-
 static void captioneer_update_window_visibility(CaptioneerOverlay *overlay) {
 	gboolean visible = overlay->final_visible || overlay->preview_visible;
 	gtk_widget_set_visible(overlay->bubble, visible);
 	gtk_widget_set_visible(GTK_WIDGET(overlay->window), visible);
-	if (visible && overlay->x11) {
+	if (visible) {
 		g_idle_add(captioneer_reposition_x11, overlay);
 	}
 }
@@ -236,9 +392,7 @@ static gboolean captioneer_apply_update(gpointer data) {
 
 	overlay->preview_visible = update->preview_text[0] != '\0';
 	if (overlay->preview_visible) {
-		char *preview = g_strdup_printf("… %s", update->preview_text);
-		gtk_label_set_text(GTK_LABEL(overlay->preview_label), preview);
-		g_free(preview);
+		gtk_label_set_text(GTK_LABEL(overlay->preview_label), update->preview_text);
 	} else {
 		gtk_label_set_text(GTK_LABEL(overlay->preview_label), "");
 	}
@@ -287,6 +441,8 @@ static CaptioneerOverlay *captioneer_overlay_new(
 	int max_width,
 	const char *monitor_selection,
 	int click_through,
+	int position_x,
+	int position_y,
 	char **warning_message,
 	char **error_message
 ) {
@@ -315,6 +471,10 @@ static CaptioneerOverlay *captioneer_overlay_new(
 	CaptioneerOverlay *overlay = g_new0(CaptioneerOverlay, 1);
 	overlay->loop = g_main_loop_new(NULL, FALSE);
 	overlay->x11 = x11;
+	overlay->click_through = click_through != 0;
+	overlay->bottom_margin = bottom_margin;
+	overlay->position_x = position_x;
+	overlay->position_y = position_y;
 
 	char *monitor_error = NULL;
 	if (wayland && g_strcmp0(monitor_selection, "auto") == 0) {
@@ -336,20 +496,17 @@ static CaptioneerOverlay *captioneer_overlay_new(
 	gtk_window_set_resizable(overlay->window, FALSE);
 	gtk_widget_set_focusable(GTK_WIDGET(overlay->window), FALSE);
 	gtk_widget_add_css_class(GTK_WIDGET(overlay->window), "captioneer-overlay");
-	g_object_set_data(G_OBJECT(overlay->window), "bottom-margin", GINT_TO_POINTER(bottom_margin));
 	g_signal_connect(overlay->window, "close-request", G_CALLBACK(captioneer_window_close), overlay);
 
 	if (wayland && gtk_layer_is_supported()) {
+		overlay->layer_shell = TRUE;
 		gtk_layer_init_for_window(overlay->window);
 		gtk_layer_set_namespace(overlay->window, "captioneer");
 		gtk_layer_set_layer(overlay->window, GTK_LAYER_SHELL_LAYER_OVERLAY);
-		// Stretch across the bottom edge so the compositor pins the surface
-		// there (single-edge anchoring can leave it floating mid-screen on
-		// Plasma). The bubble itself stays content-width and centered.
+		// Pin with LEFT+TOP margins so placement is exact. Stretching LEFT+RIGHT
+		// made Plasma size the surface oddly and parked captions mid-screen.
 		gtk_layer_set_anchor(overlay->window, GTK_LAYER_SHELL_EDGE_LEFT, TRUE);
-		gtk_layer_set_anchor(overlay->window, GTK_LAYER_SHELL_EDGE_RIGHT, TRUE);
-		gtk_layer_set_anchor(overlay->window, GTK_LAYER_SHELL_EDGE_BOTTOM, TRUE);
-		gtk_layer_set_margin(overlay->window, GTK_LAYER_SHELL_EDGE_BOTTOM, bottom_margin);
+		gtk_layer_set_anchor(overlay->window, GTK_LAYER_SHELL_EDGE_TOP, TRUE);
 		gtk_layer_set_exclusive_zone(overlay->window, 0);
 		gtk_layer_set_keyboard_mode(overlay->window, GTK_LAYER_SHELL_KEYBOARD_MODE_NONE);
 		if (overlay->monitor != NULL) {
@@ -384,7 +541,7 @@ static CaptioneerOverlay *captioneer_overlay_new(
 	overlay->bubble = box;
 	gtk_widget_add_css_class(box, "captioneer-bubble");
 	gtk_widget_set_halign(box, GTK_ALIGN_CENTER);
-	gtk_widget_set_valign(box, GTK_ALIGN_END);
+	gtk_widget_set_valign(box, GTK_ALIGN_START);
 	gtk_widget_set_hexpand(box, FALSE);
 	gtk_widget_set_vexpand(box, FALSE);
 	gtk_widget_set_size_request(box, effective_width, -1);
@@ -417,6 +574,14 @@ static CaptioneerOverlay *captioneer_overlay_new(
 	gtk_widget_add_css_class(overlay->preview_label, "captioneer-preview");
 	gtk_window_set_child(overlay->window, box);
 
+	GtkGesture *drag = gtk_gesture_drag_new();
+	gtk_gesture_single_set_button(GTK_GESTURE_SINGLE(drag), GDK_BUTTON_PRIMARY);
+	gtk_event_controller_set_propagation_phase(GTK_EVENT_CONTROLLER(drag), GTK_PHASE_CAPTURE);
+	g_signal_connect(drag, "drag-begin", G_CALLBACK(captioneer_drag_begin), overlay);
+	g_signal_connect(drag, "drag-update", G_CALLBACK(captioneer_drag_update), overlay);
+	g_signal_connect(drag, "drag-end", G_CALLBACK(captioneer_drag_end), overlay);
+	gtk_widget_add_controller(overlay->bubble, GTK_EVENT_CONTROLLER(drag));
+
 	char *font_family_rule = captioneer_font_family_rule(font_family);
 	char *css = g_strdup_printf(
 		"window.captioneer-overlay { background-color: transparent; box-shadow: none; }"
@@ -433,15 +598,20 @@ static CaptioneerOverlay *captioneer_overlay_new(
 
 	gtk_widget_realize(GTK_WIDGET(overlay->window));
 	GdkSurface *surface = gtk_native_get_surface(GTK_NATIVE(overlay->window));
-	if (click_through) {
-		captioneer_set_input_passthrough(overlay, warnings);
+	if (overlay->click_through) {
+		if (!gdk_display_supports_input_shapes(display)) {
+			captioneer_append_warning(warnings, "This display backend does not support pointer click-through.");
+		} else {
+			captioneer_update_input_region(overlay);
+		}
 	}
 	if (x11) {
 		captioneer_apply_x11_hints(overlay);
-		g_signal_connect(surface, "notify::width", G_CALLBACK(captioneer_surface_size_changed), overlay);
-		g_signal_connect(surface, "notify::height", G_CALLBACK(captioneer_surface_size_changed), overlay);
 	}
+	g_signal_connect(surface, "notify::width", G_CALLBACK(captioneer_surface_size_changed), overlay);
+	g_signal_connect(surface, "notify::height", G_CALLBACK(captioneer_surface_size_changed), overlay);
 	gtk_widget_set_visible(GTK_WIDGET(overlay->window), FALSE);
+	captioneer_apply_placement(overlay);
 
 	if (warnings->len > 0) {
 		*warning_message = g_string_free(warnings, FALSE);
@@ -516,6 +686,28 @@ type Sink struct {
 	closed         bool
 }
 
+var (
+	positionSaverMu sync.Mutex
+	positionSaver   func(x, y int)
+)
+
+// SetPositionSaver registers a callback invoked when the user finishes a CTRL-drag.
+func SetPositionSaver(save func(x, y int)) {
+	positionSaverMu.Lock()
+	positionSaver = save
+	positionSaverMu.Unlock()
+}
+
+//export captioneerOverlayPositionChanged
+func captioneerOverlayPositionChanged(x, y C.int) {
+	positionSaverMu.Lock()
+	save := positionSaver
+	positionSaverMu.Unlock()
+	if save != nil {
+		save(int(x), int(y))
+	}
+}
+
 func New(settings config.OverlaySettings) (*Sink, string, error) {
 	backend := C.CString(string(settings.Backend))
 	fontFamily := C.CString(settings.FontFamily)
@@ -535,6 +727,8 @@ func New(settings config.OverlaySettings) (*Sink, string, error) {
 		C.int(settings.MaxWidth),
 		monitor,
 		boolInt(settings.ClickThrough),
+		C.int(settings.PositionX),
+		C.int(settings.PositionY),
 		&warningMessage,
 		&errorMessage,
 	)