sdgui: make Ctrl+click put hovered word in search

We could annoyingly get these events on window de/focus.

README.adoc

@@ -96,7 +96,7 @@ should be addressed before including the software in regular Linux and/or
 BSD distributions:
 
  - The tab bar doesn't handle overflows well in the TUI.
- - The GUI has a few usability issues, and is awkward to configure.
+ - The GUI is awkward to configure.
  - Lacking configuration, standard StarDict locations should be scanned.
 
 Given all issues with the file format, it might be better to start anew.

src/sdgui.c

@@ -127,6 +127,15 @@ on_changed (G_GNUC_UNUSED GtkWidget *widget, G_GNUC_UNUSED gpointer data)
 	search (g_ptr_array_index (g.dictionaries, g.dictionary));
 }
 
+static void
+on_send (G_GNUC_UNUSED StardictView *view,
+	const char *word, G_GNUC_UNUSED gpointer data)
+{
+	GtkEntryBuffer *buf = gtk_entry_get_buffer (GTK_ENTRY (g.entry));
+	gtk_entry_buffer_set_text (buf, word, -1);
+	gtk_editable_select_region (GTK_EDITABLE (g.entry), 0, -1);
+}
+
 static void
 on_selection_received (G_GNUC_UNUSED GtkClipboard *clipboard, const gchar *text,
 	G_GNUC_UNUSED gpointer data)
@@ -529,6 +538,8 @@ main (int argc, char *argv[])
 	gtk_drag_dest_add_uri_targets (g.view);
 	g_signal_connect (g.view, "drag-data-received",
 		G_CALLBACK (on_drag_data_received), NULL);
+	g_signal_connect (g.view, "send",
+		G_CALLBACK (on_send), NULL);
 
 	gtk_widget_show_all (g.window);
 	gtk_main ();

src/stardict-view.c

@@ -149,15 +149,51 @@ struct view_entry_render_ctx
 	PangoLayout *selection_layout;
 	int selection_begin;
 	int selection_end;
+	PangoLayout *hover_layout;
+	int hover_begin;
+	int hover_end;
 };
 
+static PangoLayout *
+view_entry_adjust_layout (ViewEntryRenderCtx *ctx, PangoLayout *layout)
+{
+	if (layout != ctx->hover_layout)
+		return g_object_ref (layout);
+
+	layout = pango_layout_copy (layout);
+	PangoAttrList *attrs = pango_layout_get_attributes (layout);
+	attrs = attrs
+		? pango_attr_list_copy (attrs)
+		: pango_attr_list_new ();
+
+	PangoAttribute *u = pango_attr_underline_new (PANGO_UNDERLINE_SINGLE);
+	u->start_index = ctx->hover_begin;
+	u->end_index = ctx->hover_end;
+	pango_attr_list_change (attrs, u);
+
+	PangoAttribute *uc = pango_attr_underline_color_new (0, 0, 0xffff);
+	uc->start_index = ctx->hover_begin;
+	uc->end_index = ctx->hover_end;
+	pango_attr_list_change (attrs, uc);
+
+	PangoAttribute *c = pango_attr_foreground_new (0, 0, 0xffff);
+	c->start_index = ctx->hover_begin;
+	c->end_index = ctx->hover_end;
+	pango_attr_list_change (attrs, c);
+
+	pango_layout_set_attributes (layout, attrs);
+	pango_attr_list_unref (attrs);
+	return layout;
+}
+
 static void
 view_entry_render (ViewEntryRenderCtx *ctx, gdouble x, gdouble y,
 	PangoLayout *layout)
 {
-	gtk_render_layout (ctx->style, ctx->cr, x, y, layout);
+	PangoLayout *adjusted = view_entry_adjust_layout (ctx, layout);
+	gtk_render_layout (ctx->style, ctx->cr, x, y, adjusted);
 	if (layout != ctx->selection_layout)
-		return;
+		goto out;
 
 	gtk_style_context_save (ctx->style);
 	gtk_style_context_set_state (ctx->style, GTK_STATE_FLAG_SELECTED);
@@ -166,16 +202,18 @@ view_entry_render (ViewEntryRenderCtx *ctx, gdouble x, gdouble y,
 	int ranges[2] = { MIN (ctx->selection_begin, ctx->selection_end),
 		MAX (ctx->selection_begin, ctx->selection_end) };
 	cairo_region_t *region
-		= gdk_pango_layout_get_clip_region (layout, x, y, ranges, 1);
+		= gdk_pango_layout_get_clip_region (adjusted, x, y, ranges, 1);
 	gdk_cairo_region (ctx->cr, region);
 	cairo_clip (ctx->cr);
 	cairo_region_destroy (region);
 
 	gtk_render_background (ctx->style, ctx->cr, 0, 0, ctx->width, ctx->height);
-	gtk_render_layout (ctx->style, ctx->cr, x, y, layout);
+	gtk_render_layout (ctx->style, ctx->cr, x, y, adjusted);
 
 	cairo_restore (ctx->cr);
 	gtk_style_context_restore (ctx->style);
+out:
+	g_object_unref (adjusted);
 }
 
 static gint
@@ -272,6 +310,10 @@ struct _StardictView
 	GWeakRef selection;                 ///< Selected PangoLayout, if any
 	int selection_begin;                ///< Start index within `selection`
 	int selection_end;                  ///< End index within `selection`
+
+	GWeakRef hover;                     ///< Hovered PangoLayout, if any
+	int hover_begin;                    ///< Word start index within `hover`
+	int hover_end;                      ///< Word end index within `hover`
 };
 
 static ViewEntry *
@@ -283,6 +325,23 @@ make_entry (StardictView *self, StardictIterator *iterator)
 	return ve;
 }
 
+static void
+reset_hover (StardictView *self)
+{
+	GtkWidget *widget = GTK_WIDGET (self);
+	PangoLayout *hover = g_weak_ref_get (&self->hover);
+	if (hover)
+	{
+		g_object_unref (hover);
+		g_weak_ref_set (&self->hover, NULL);
+		self->hover_begin = self->hover_end = -1;
+		gtk_widget_queue_draw (widget);
+	}
+
+	if (gtk_widget_get_realized (widget))
+		gdk_window_set_cursor (gtk_widget_get_window (widget), NULL);
+}
+
 static void
 adjust_for_height (StardictView *self)
 {
@@ -314,6 +373,14 @@ adjust_for_height (StardictView *self)
 	}
 	g_object_unref (iterator);
 
+	// Also handling this for adjust_for_offset(), which calls this.
+	PangoLayout *selection = g_weak_ref_get (&self->selection);
+	if (selection)
+		g_object_unref (selection);
+	else
+		self->selection_begin = self->selection_end = -1;
+
+	reset_hover (self);
 	self->entries = g_list_concat (self->entries, g_list_reverse (append));
 	gtk_widget_queue_draw (widget);
 }
@@ -365,13 +432,13 @@ reload (StardictView *self)
 {
 	GtkWidget *widget = GTK_WIDGET (self);
 
-	// FIXME: this invalidates the selection, we'd need better identification
 	g_list_free_full (self->entries, (GDestroyNotify) view_entry_destroy);
 	self->entries = NULL;
 	gtk_widget_queue_draw (widget);
 
 	// For consistency, and the check in make_context_menu()
 	self->selection_begin = self->selection_end = -1;
+	reset_hover (self);
 
 	if (gtk_widget_get_realized (widget) && self->dict)
 		adjust_for_height (self);
@@ -387,131 +454,7 @@ natural_row_size (GtkWidget *widget)
 	return height;
 }
 
-// --- Boilerplate -------------------------------------------------------------
+// --- Figuring out where stuff is----------------------------------------------
-
-G_DEFINE_TYPE (StardictView, stardict_view, GTK_TYPE_WIDGET)
-
-static void
-stardict_view_finalize (GObject *gobject)
-{
-	StardictView *self = STARDICT_VIEW (gobject);
-	g_clear_object (&self->dict);
-
-	g_list_free_full (self->entries, (GDestroyNotify) view_entry_destroy);
-	self->entries = NULL;
-
-	g_object_unref (self->selection_gesture);
-	g_weak_ref_clear (&self->selection);
-
-	g_free (self->matched);
-	self->matched = NULL;
-
-	G_OBJECT_CLASS (stardict_view_parent_class)->finalize (gobject);
-}
-
-static void
-stardict_view_get_preferred_height (GtkWidget *widget,
-	gint *minimum, gint *natural)
-{
-	// There isn't any value that would make any real sense
-	if (!STARDICT_VIEW (widget)->dict)
-		*natural = *minimum = 0;
-	else
-		*natural = *minimum = natural_row_size (widget);
-}
-
-static void
-stardict_view_get_preferred_width (GtkWidget *widget,
-	gint *minimum, gint *natural)
-{
-	GtkStyleContext *style = gtk_widget_get_style_context (widget);
-	GtkBorder padding = view_entry_get_padding (style);
-	*natural = *minimum = 2 * (padding.left + 1 * padding.right);
-}
-
-static void
-stardict_view_realize (GtkWidget *widget)
-{
-	GtkAllocation allocation;
-	gtk_widget_get_allocation (widget, &allocation);
-
-	GdkWindowAttr attributes =
-	{
-		.window_type = GDK_WINDOW_CHILD,
-		.x           = allocation.x,
-		.y           = allocation.y,
-		.width       = allocation.width,
-		.height      = allocation.height,
-
-		// Input-only would presumably also work (as in GtkPathBar, e.g.),
-		// but it merely seems to involve more work.
-		.wclass      = GDK_INPUT_OUTPUT,
-		.visual      = gtk_widget_get_visual (widget),
-		.event_mask  = gtk_widget_get_events (widget) | GDK_SCROLL_MASK
-			| GDK_SMOOTH_SCROLL_MASK | GDK_BUTTON_PRESS_MASK,
-	};
-
-	// We need this window to receive input events at all.
-	// TODO: see if we don't want GDK_WA_CURSOR for setting a text cursor
-	GdkWindow *window = gdk_window_new (gtk_widget_get_parent_window (widget),
-		&attributes, GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL);
-
-	// The default background colour of the GDK window is transparent
-	gtk_widget_register_window (widget, window);
-	gtk_widget_set_window (widget, window);
-	gtk_widget_set_realized (widget, TRUE);
-}
-
-static gboolean
-stardict_view_draw (GtkWidget *widget, cairo_t *cr)
-{
-	StardictView *self = STARDICT_VIEW (widget);
-
-	GtkAllocation allocation;
-	gtk_widget_get_allocation (widget, &allocation);
-
-	GtkStyleContext *style = gtk_widget_get_style_context (widget);
-	gtk_render_background (style, cr,
-		0, 0, allocation.width, allocation.height);
-	gtk_render_frame (style, cr,
-		0, 0, allocation.width, allocation.height);
-
-	ViewEntryRenderCtx ctx =
-	{
-		.style = style,
-		.cr = cr,
-		.width = allocation.width,
-		.height = 0,
-		.selection_layout = g_weak_ref_get (&self->selection),
-		.selection_begin = self->selection_begin,
-		.selection_end = self->selection_end,
-	};
-
-	gint offset = -self->top_offset;
-	gint i = self->top_position;
-	for (GList *iter = self->entries; iter; iter = iter->next)
-	{
-		// Style regions would be appropriate, if they weren't deprecated.
-		// GTK+ CSS gadgets/nodes are an internal API.  We don't want to turn
-		// this widget into a container, to avoid needless complexity.
-		//
-		// gtk_style_context_{get,set}_path() may be misused by adding the same
-		// GType with gtk_widget_path_append_type() and changing its name
-		// using gtk_widget_path_iter_set_name()... but that is ugly.
-		gtk_style_context_save (style);
-		gtk_style_context_add_class (style, (i++ & 1) ? "even" : "odd");
-
-		cairo_save (cr);
-		cairo_translate (cr, 0, offset);
-		// TODO: later exclude clipped entries, but it's not that important
-		offset += view_entry_draw (iter->data, &ctx);
-		cairo_restore (cr);
-
-		gtk_style_context_restore (style);
-	}
-	g_clear_object (&ctx.selection_layout);
-	return TRUE;
-}
 
 /// Figure out which layout is at given widget coordinates, and translate them.
 static PangoLayout *
@@ -584,13 +527,270 @@ layout_coords (StardictView *self, PangoLayout *layout, int *x, int *y)
 	return FALSE;
 }
 
+static int
+layout_index_at (PangoLayout *layout, int x, int y)
+{
+	int index = 0, trailing = 0;
+	(void) pango_layout_xy_to_index (layout,
+		x * PANGO_SCALE,
+		y * PANGO_SCALE,
+		&index,
+		&trailing);
+
+	const char *text = pango_layout_get_text (layout) + index;
+	while (trailing--)
+	{
+		int len = g_utf8_next_char (text) - text;
+		text += len;
+		index += len;
+	}
+	return index;
+}
+
+static PangoLayout *
+locate_word_at (StardictView *self, int x, int y, int *beginpos, int *endpos)
+{
+	*beginpos = -1;
+	*endpos = -1;
+	PangoLayout *layout = layout_at (self, &x, &y);
+	if (!layout)
+		return NULL;
+
+	const char *text = pango_layout_get_text (layout), *p = NULL;
+	const char *begin = text + layout_index_at (layout, x, y), *end = begin;
+	while ((p = g_utf8_find_prev_char (text, begin))
+		&& !g_unichar_isspace (g_utf8_get_char (p)))
+		begin = p;
+	gunichar c;
+	while ((c = g_utf8_get_char (end)) && !g_unichar_isspace (c))
+		end = g_utf8_next_char (end);
+
+	*beginpos = begin - text;
+	*endpos = end - text;
+	return layout;
+}
+
+// --- Boilerplate -------------------------------------------------------------
+
+G_DEFINE_TYPE (StardictView, stardict_view, GTK_TYPE_WIDGET)
+
+enum {
+	SEND,
+	LAST_SIGNAL,
+};
+
+static guint view_signals[LAST_SIGNAL];
+
+static void
+stardict_view_finalize (GObject *gobject)
+{
+	StardictView *self = STARDICT_VIEW (gobject);
+	g_clear_object (&self->dict);
+
+	g_list_free_full (self->entries, (GDestroyNotify) view_entry_destroy);
+	self->entries = NULL;
+
+	g_object_unref (self->selection_gesture);
+	g_weak_ref_clear (&self->selection);
+
+	g_free (self->matched);
+	self->matched = NULL;
+
+	G_OBJECT_CLASS (stardict_view_parent_class)->finalize (gobject);
+}
+
+static void
+stardict_view_get_preferred_height (GtkWidget *widget,
+	gint *minimum, gint *natural)
+{
+	// There isn't any value that would make any real sense
+	if (!STARDICT_VIEW (widget)->dict)
+		*natural = *minimum = 0;
+	else
+		*natural = *minimum = natural_row_size (widget);
+}
+
+static void
+stardict_view_get_preferred_width (GtkWidget *widget,
+	gint *minimum, gint *natural)
+{
+	GtkStyleContext *style = gtk_widget_get_style_context (widget);
+	GtkBorder padding = view_entry_get_padding (style);
+	*natural = *minimum = 2 * (padding.left + 1 * padding.right);
+}
+
+static void
+stardict_view_realize (GtkWidget *widget)
+{
+	GtkAllocation allocation;
+	gtk_widget_get_allocation (widget, &allocation);
+
+	GdkWindowAttr attributes =
+	{
+		.window_type = GDK_WINDOW_CHILD,
+		.x           = allocation.x,
+		.y           = allocation.y,
+		.width       = allocation.width,
+		.height      = allocation.height,
+
+		// Input-only would presumably also work (as in GtkPathBar, e.g.),
+		// but it merely seems to involve more work.
+		.wclass      = GDK_INPUT_OUTPUT,
+		.visual      = gtk_widget_get_visual (widget),
+		.event_mask  = gtk_widget_get_events (widget) | GDK_SCROLL_MASK
+			| GDK_SMOOTH_SCROLL_MASK | GDK_BUTTON_PRESS_MASK
+			| GDK_POINTER_MOTION_MASK | GDK_LEAVE_NOTIFY_MASK,
+	};
+
+	// We need this window to receive input events at all.
+	GdkWindow *window = gdk_window_new (gtk_widget_get_parent_window (widget),
+		&attributes, GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL);
+
+	// The default background colour of the GDK window is transparent
+	gtk_widget_register_window (widget, window);
+	gtk_widget_set_window (widget, window);
+	gtk_widget_set_realized (widget, TRUE);
+}
+
+static void
+reset_hover_for_event (StardictView *self, guint state, int x, int y)
+{
+	reset_hover (self);
+	if ((state &= gtk_accelerator_get_default_mod_mask ()) != GDK_CONTROL_MASK)
+		return;
+
+	g_weak_ref_set (&self->hover,
+		locate_word_at (self, x, y, &self->hover_begin, &self->hover_end));
+	gtk_widget_queue_draw (GTK_WIDGET (self));
+
+	GdkWindow *window = gtk_widget_get_window (GTK_WIDGET (self));
+	GdkCursor *cursor = gdk_cursor_new_from_name
+		(gdk_window_get_display (window), "pointer");
+	gdk_window_set_cursor (window, cursor);
+	g_object_unref (cursor);
+}
+
+static void
+on_keymap_state_changed (G_GNUC_UNUSED GdkKeymap *keymap, StardictView *self)
+{
+	GdkDisplay *display = gtk_widget_get_display (GTK_WIDGET (self));
+	GdkSeat *seat = gdk_display_get_default_seat (display);
+	GdkDevice *pointer = gdk_seat_get_pointer (seat);
+
+	int x = -1, y = -1;
+	GdkModifierType state = 0;
+	GdkWindow *window = gtk_widget_get_window (GTK_WIDGET (self));
+	gdk_window_get_device_position (window, pointer, &x, &y, &state);
+	reset_hover_for_event (self, state, x, y);
+}
+
+static void
+stardict_view_map (GtkWidget *widget)
+{
+	GTK_WIDGET_CLASS (stardict_view_parent_class)->map (widget);
+
+	GdkWindow *window = gtk_widget_get_window (widget);
+	GdkDisplay *display = gdk_window_get_display (window);
+	GdkKeymap *keymap = gdk_keymap_get_for_display (display);
+	g_signal_connect (keymap, "state-changed",
+		G_CALLBACK (on_keymap_state_changed), widget);
+}
+
+static void
+stardict_view_unmap (GtkWidget *widget)
+{
+	GdkWindow *window = gtk_widget_get_window (widget);
+	GdkDisplay *display = gdk_window_get_display (window);
+	GdkKeymap *keymap = gdk_keymap_get_for_display (display);
+	g_signal_handlers_disconnect_by_data (keymap, widget);
+
+	GTK_WIDGET_CLASS (stardict_view_parent_class)->unmap (widget);
+}
+
+static gboolean
+stardict_view_draw (GtkWidget *widget, cairo_t *cr)
+{
+	StardictView *self = STARDICT_VIEW (widget);
+
+	GtkAllocation allocation;
+	gtk_widget_get_allocation (widget, &allocation);
+
+	GtkStyleContext *style = gtk_widget_get_style_context (widget);
+	gtk_render_background (style, cr,
+		0, 0, allocation.width, allocation.height);
+	gtk_render_frame (style, cr,
+		0, 0, allocation.width, allocation.height);
+
+	ViewEntryRenderCtx ctx =
+	{
+		.style = style,
+		.cr = cr,
+		.width = allocation.width,
+		.height = 0,
+
+		.selection_layout = g_weak_ref_get (&self->selection),
+		.selection_begin = self->selection_begin,
+		.selection_end = self->selection_end,
+		.hover_layout = g_weak_ref_get (&self->hover),
+		.hover_begin = self->hover_begin,
+		.hover_end = self->hover_end,
+	};
+
+	gint offset = -self->top_offset;
+	gint i = self->top_position;
+	for (GList *iter = self->entries; iter; iter = iter->next)
+	{
+		// Style regions would be appropriate, if they weren't deprecated.
+		// GTK+ CSS gadgets/nodes are an internal API.  We don't want to turn
+		// this widget into a container, to avoid needless complexity.
+		//
+		// gtk_style_context_{get,set}_path() may be misused by adding the same
+		// GType with gtk_widget_path_append_type() and changing its name
+		// using gtk_widget_path_iter_set_name()... but that is ugly.
+		gtk_style_context_save (style);
+		gtk_style_context_add_class (style, (i++ & 1) ? "even" : "odd");
+
+		cairo_save (cr);
+		cairo_translate (cr, 0, offset);
+		// TODO: later exclude clipped entries, but it's not that important
+		offset += view_entry_draw (iter->data, &ctx);
+		cairo_restore (cr);
+
+		gtk_style_context_restore (style);
+	}
+	g_clear_object (&ctx.selection_layout);
+	g_clear_object (&ctx.hover_layout);
+	return TRUE;
+}
+
 static void
 stardict_view_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
 {
 	GTK_WIDGET_CLASS (stardict_view_parent_class)
 		->size_allocate (widget, allocation);
 
-	reload (STARDICT_VIEW (widget));
+	StardictView *self = STARDICT_VIEW (widget);
+	if (!gtk_widget_get_realized (widget) || !self->dict)
+		return;
+
+	PangoLayout *selection = g_weak_ref_get (&self->selection), **origin = NULL;
+	for (GList *iter = self->entries; iter; iter = iter->next)
+	{
+		ViewEntry *ve = iter->data;
+		if (selection && selection == ve->word_layout)
+			origin = &ve->word_layout;
+		if (selection && selection == ve->definition_layout)
+			origin = &ve->definition_layout;
+	}
+	if (selection)
+		g_object_unref (selection);
+
+	for (GList *iter = self->entries; iter; iter = iter->next)
+		view_entry_rebuild_layouts (iter->data, widget);
+	if (origin)
+		g_weak_ref_set (&self->selection, *origin);
+
+	adjust_for_offset (self);
 }
 
 static void
@@ -635,31 +835,11 @@ stardict_view_scroll_event (GtkWidget *widget, GdkEventScroll *event)
 	}
 }
 
-static int
-layout_index_at (PangoLayout *layout, int x, int y)
-{
-	int index = 0, trailing = 0;
-	(void) pango_layout_xy_to_index (layout,
-		x * PANGO_SCALE,
-		y * PANGO_SCALE,
-		&index,
-		&trailing);
-
-	const char *text = pango_layout_get_text (layout) + index;
-	while (trailing--)
-	{
-		int len = g_utf8_next_char(text) - text;
-		text += len;
-		index += len;
-	}
-	return index;
-}
-
 static void
 publish_selection (StardictView *self, GdkAtom target)
 {
 	PangoLayout *layout = g_weak_ref_get (&self->selection);
-	if (!layout || self->selection_begin == self->selection_end)
+	if (!layout)
 		return;
 
 	// Unlike GtkLabel, we don't place the selection in PRIMARY immediately.
@@ -667,7 +847,7 @@ publish_selection (StardictView *self, GdkAtom target)
 	int len = strlen (text),
 		s1 = MIN (self->selection_begin, self->selection_end),
 		s2 = MAX (self->selection_begin, self->selection_end);
-	if (s1 >= 0 && s1 <= len && s2 >= 0 && s2 <= len)
+	if (s1 != s2 && s1 >= 0 && s1 <= len && s2 >= 0 && s2 <= len)
 		gtk_clipboard_set_text (gtk_clipboard_get (target), text + s1, s2 - s1);
 	g_object_unref (layout);
 }
@@ -675,22 +855,9 @@ publish_selection (StardictView *self, GdkAtom target)
 static void
 select_word_at (StardictView *self, int x, int y)
 {
-	PangoLayout *layout = layout_at (self, &x, &y);
+	g_weak_ref_set (&self->selection, locate_word_at (self,
-	if (!layout)
+		x, y, &self->selection_begin, &self->selection_end));
-		return;
 
-	const char *text = pango_layout_get_text (layout), *p = NULL;
-	const char *begin = text + layout_index_at (layout, x, y), *end = begin;
-	while ((p = g_utf8_find_prev_char (text, begin))
-		&& !g_unichar_isspace (g_utf8_get_char (p)))
-		begin = p;
-	gunichar c;
-	while ((c = g_utf8_get_char (end)) && !g_unichar_isspace (c))
-		end = g_utf8_next_char (end);
-
-	g_weak_ref_set (&self->selection, layout);
-	self->selection_begin = begin - text;
-	self->selection_end = end - text;
 	gtk_widget_queue_draw (GTK_WIDGET (self));
 	publish_selection (self, GDK_SELECTION_PRIMARY);
 }
@@ -729,7 +896,7 @@ make_context_menu (StardictView *self)
 {
 	GtkWidget *copy = gtk_menu_item_new_with_mnemonic ("_Copy");
 	gtk_widget_set_sensitive (copy,
-		self->selection_begin < self->selection_end);
+		self->selection_begin != self->selection_end);
 	g_signal_connect_data (copy, "activate",
 		G_CALLBACK (on_copy_activate), g_object_ref (self),
 		(GClosureNotify) g_object_unref, 0);
@@ -779,6 +946,23 @@ stardict_view_button_press_event (GtkWidget *widget, GdkEventButton *event)
 		->button_press_event (widget, event);
 }
 
+static gboolean
+stardict_view_motion_notify_event (GtkWidget *widget, GdkEventMotion *event)
+{
+	StardictView *self = STARDICT_VIEW (widget);
+	reset_hover_for_event (self, event->state, event->x, event->y);
+	return GTK_WIDGET_CLASS (stardict_view_parent_class)
+		->motion_notify_event (widget, event);
+}
+
+static gboolean
+stardict_view_leave_notify_event
+	(GtkWidget *widget, G_GNUC_UNUSED GdkEventCrossing *event)
+{
+	reset_hover (STARDICT_VIEW (widget));
+	return GDK_EVENT_PROPAGATE;
+}
+
 static void
 on_drag_begin (GtkGestureDrag *drag, G_GNUC_UNUSED gdouble start_x,
 	G_GNUC_UNUSED gdouble start_y, gpointer user_data)
@@ -811,21 +995,49 @@ on_drag_update (G_GNUC_UNUSED GtkGestureDrag *drag,
 	self->drag_last_offset = offset_y;
 }
 
+static gboolean
+send_hover (StardictView *self)
+{
+	PangoLayout *layout = g_weak_ref_get (&self->hover);
+	if (!layout)
+		return FALSE;
+
+	const char *text = pango_layout_get_text (layout);
+	int len = strlen (text),
+		s1 = MIN (self->hover_begin, self->hover_end),
+		s2 = MAX (self->hover_begin, self->hover_end);
+	if (s1 != s2 && s1 >= 0 && s1 <= len && s2 >= 0 && s2 <= len)
+	{
+		gchar *word = g_strndup (text + s1, s2 - s1);
+		g_signal_emit (self, view_signals[SEND], 0, word);
+		g_free (word);
+	}
+	g_object_unref (layout);
+	return TRUE;
+}
+
 static void
 on_select_begin (GtkGestureDrag *drag, gdouble start_x, gdouble start_y,
 	gpointer user_data)
 {
+	// We probably don't need to check modifiers and mouse position again.
+	StardictView *self = STARDICT_VIEW (user_data);
+	GtkGesture *gesture = GTK_GESTURE (drag);
+	if (send_hover (self))
+	{
+		gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_DENIED);
+		return;
+	}
+
 	// Despite our two gestures not being grouped up, claiming one doesn't
 	// deny the other, and :exclusive isn't the opposite of :touch-only.
 	// A non-NULL sequence indicates a touch event.
-	GtkGesture *gesture = GTK_GESTURE (drag);
 	if (gtk_gesture_get_last_updated_sequence (gesture))
 	{
 		gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_DENIED);
 		return;
 	}
 
-	StardictView *self = STARDICT_VIEW (user_data);
 	g_weak_ref_set (&self->selection, NULL);
 	self->selection_begin = -1;
 	self->selection_end = -1;
@@ -889,6 +1101,10 @@ on_select_end (G_GNUC_UNUSED GtkGestureDrag *drag,
 static void
 stardict_view_class_init (StardictViewClass *klass)
 {
+	view_signals[SEND] = g_signal_new ("send",
+		G_TYPE_FROM_CLASS (klass), 0, 0, NULL, NULL, NULL,
+		G_TYPE_NONE, 1, G_TYPE_STRING);
+
 	GObjectClass *object_class = G_OBJECT_CLASS (klass);
 	object_class->finalize = stardict_view_finalize;
 
@@ -896,11 +1112,15 @@ stardict_view_class_init (StardictViewClass *klass)
 	widget_class->get_preferred_height = stardict_view_get_preferred_height;
 	widget_class->get_preferred_width = stardict_view_get_preferred_width;
 	widget_class->realize = stardict_view_realize;
+	widget_class->map = stardict_view_map;
+	widget_class->unmap = stardict_view_unmap;
 	widget_class->draw = stardict_view_draw;
 	widget_class->size_allocate = stardict_view_size_allocate;
 	widget_class->screen_changed = stardict_view_screen_changed;
 	widget_class->scroll_event = stardict_view_scroll_event;
 	widget_class->button_press_event = stardict_view_button_press_event;
+	widget_class->motion_notify_event = stardict_view_motion_notify_event;
+	widget_class->leave_notify_event = stardict_view_leave_notify_event;
 
 	gtk_widget_class_set_css_name (widget_class, "stardict-view");
 }