From e6e84a27ee6eb6c52fc26aa4f175e85af07fd901 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.org.uk>
Date: Tue, 13 Oct 2015 23:25:00 +0200
Subject: Make text insertion (mostly) work

---
 src/sc_editor.c | 28 ++++++++++++++++++++++++++--
 src/shape.c     |  8 ++++++--
 2 files changed, 32 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/sc_editor.c b/src/sc_editor.c
index c8ef09a..6619b06 100644
--- a/src/sc_editor.c
+++ b/src/sc_editor.c
@@ -568,7 +568,9 @@ static void update_local(SCEditor *e, struct frame *fr, int line, int bn)
 	cairo_t *cr;
 
 	/* Shape the box again */
-	shape_box(box);
+	shape_box(box->cf->cf);
+	box->glyphs = box->cf->cf->glyphs;
+	box->cf->glyphs = box->cf->cf->glyphs;
 
 	/* Wrap the paragraph again */
 	wrap_contents(fr);  /* FIXME: Only the current paragraph */
@@ -585,6 +587,26 @@ static void update_local(SCEditor *e, struct frame *fr, int line, int bn)
 }
 
 
+static void shift_box_offsets(struct frame *fr, struct wrap_box *box, int n)
+{
+	int i;
+	int sn = 0;
+
+	for ( i=0; i<fr->boxes->n_boxes; i++ ) {
+		if ( &fr->boxes->boxes[i] == box ) {
+			sn = i+1;
+			break;
+		}
+	}
+
+	assert(sn > 0);  /* Lowest it can possibly be is 1 */
+
+	for ( i=sn; i<fr->boxes->n_boxes; i++ ) {
+		fr->boxes->boxes[i].offs_char += n;
+	}
+}
+
+
 static void insert_text(char *t, SCEditor *e)
 {
 	int sln, sbx, sps;
@@ -612,11 +634,13 @@ static void insert_text(char *t, SCEditor *e)
 	/* ... and also in the paragraph split but unwrapped box */
 	sbox->cf->len_chars += 1;
 
+	/* Tweak the offsets of all the subsequent boxes */
+	shift_box_offsets(fr, sbox->cf->cf, 1);
+
 	fr->empty = 0;
 
 	update_local(e, fr, sln, sbx);
 
-	/* ... by doing this properly */
 	fixup_cursor(e);
 	advance_cursor(e);
 
diff --git a/src/shape.c b/src/shape.c
index 24848e5..1983ae6 100644
--- a/src/shape.c
+++ b/src/shape.c
@@ -57,11 +57,15 @@ void shape_box(struct wrap_box *box)
 	ep = g_utf8_offset_to_pointer(sc_block_contents(box->scblock),
 	                              box->offs_char+box->len_chars);
 
+	if ( box->glyphs != NULL ) {
+		pango_glyph_string_free(box->glyphs);
+	}
+	box->glyphs = pango_glyph_string_new();
 	pango_shape(tp, ep-tp, &box->analysis, box->glyphs);
 
 	pango_glyph_string_extents(box->glyphs, box->font, NULL, &rect);
 
-	box->width += rect.width;
+	box->width = rect.width;
 	if ( rect.height > box->height ) {
 		box->height = rect.height;
 	}
@@ -108,7 +112,7 @@ static void add_wrap_box(gpointer vi, gpointer vb)
 	box->col[1] = col[1];  /* Green */
 	box->col[2] = col[2];  /* Blue */
 	box->col[3] = col[3];  /* Alpha */
-	box->glyphs = pango_glyph_string_new();
+	box->glyphs = NULL;
 	box->analysis = item->analysis;
 
 	bas->line->n_boxes++;
-- 
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