From 374120d3ccedb064c30b09ddd48131bc1b0a5df8 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.org.uk>
Date: Sun, 8 May 2016 17:57:03 +0200
Subject: Highlight paragraph only in narrative window and only during
 slideshow

---
 src/narrative_window.c |  4 ++++
 src/sc_editor.c        | 15 ++++++++++++---
 src/sc_editor.h        |  3 +++
 3 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/src/narrative_window.c b/src/narrative_window.c
index e9436cc..d1aa5f0 100644
--- a/src/narrative_window.c
+++ b/src/narrative_window.c
@@ -171,6 +171,7 @@ static void ss_end_show(SlideShow *ss, void *vp)
 {
 	NarrativeWindow *nw = vp;
 	nw->show = NULL;
+	sc_editor_set_para_highlight(nw->sceditor, 0);
 }
 
 
@@ -279,6 +280,9 @@ static void start_slideshow_sig(GSimpleAction *action, GVariant *parameter,
 	nw->sel_slide = first_slide(nw->p);
 
 	nw->show = try_start_slideshow(nw->p, ssc, nw);
+	if ( nw->show != NULL ) {
+		sc_editor_set_para_highlight(nw->sceditor, 1);
+	}
 }
 
 
diff --git a/src/sc_editor.c b/src/sc_editor.c
index 0c07b5b..beb1d5a 100644
--- a/src/sc_editor.c
+++ b/src/sc_editor.c
@@ -409,13 +409,14 @@ static void draw_editing_box(cairo_t *cr, struct frame *fr)
 
 
 static void draw_caret(cairo_t *cr, struct frame *fr, int cursor_para,
-                       size_t cursor_pos, int cursor_trail)
+                       size_t cursor_pos, int cursor_trail, int hgh)
 {
 	double cx, clow, chigh, h;
 	double cy, w;
 	const double t = 1.8;
 
-	if ( get_para_highlight(fr, cursor_para, &cx, &cy, &w, &h) == 0 ) {
+	if ( hgh && get_para_highlight(fr, cursor_para, &cx, &cy, &w, &h) == 0 )
+	{
 		cairo_new_path(cr);
 		cairo_rectangle(cr, cx+fr->x, cy+fr->y, w, h);
 		cairo_set_source_rgba(cr, 0.7, 0.7, 1.0, 0.5);
@@ -483,7 +484,7 @@ static void draw_overlay(cairo_t *cr, SCEditor *e)
 		}
 
 		draw_caret(cr, e->cursor_frame, e->cursor_para, e->cursor_pos,
-		           e->cursor_trail);
+		           e->cursor_trail, e->para_highlight);
 
 	}
 
@@ -1591,6 +1592,13 @@ void sc_editor_set_callbacks(SCEditor *e, SCCallbackList *cbl)
 }
 
 
+void sc_editor_set_para_highlight(SCEditor *e, int para_highlight)
+{
+	e->para_highlight = para_highlight;
+	sc_editor_redraw(e);
+}
+
+
 SCEditor *sc_editor_new(SCBlock *scblocks, SCBlock **stylesheets,
                         PangoLanguage *lang)
 {
@@ -1614,6 +1622,7 @@ SCEditor *sc_editor_new(SCBlock *scblocks, SCBlock **stylesheets,
 	sceditor->scroll_pos = 0;
 	sceditor->flow = 0;
 	sceditor->lang = lang;
+	sceditor->para_highlight = 0;
 
 	sceditor->stylesheets = copy_ss_list(stylesheets);
 
diff --git a/src/sc_editor.h b/src/sc_editor.h
index cf0b6d6..a2a9b38 100644
--- a/src/sc_editor.h
+++ b/src/sc_editor.h
@@ -97,6 +97,7 @@ struct _sceditor
 	ImageStore          *is;
 	SCCallbackList      *cbl;
 	struct frame        *top;
+	int                  para_highlight;
 
 	/* Redraw/scroll stuff */
 	GtkScrollablePolicy  hpol;
@@ -181,4 +182,6 @@ extern void sc_editor_delete_selected_frame(SCEditor *e);
 extern void sc_editor_remove_cursor(SCEditor *e);
 extern SCBlock *split_paragraph_at_cursor(SCEditor *e);
 
+extern void sc_editor_set_para_highlight(SCEditor *e, int para_highlight);
+
 #endif	/* SC_EDITOR_H */
-- 
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