From 4e204b3e02f78ca60d32d0c704abcb5499384157 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.org.uk>
Date: Mon, 12 Oct 2015 22:53:02 +0200
Subject: Redraw on edit

---
 src/render.c    | 30 +++++++++++++++++++++---------
 src/render.h    |  3 +++
 src/sc_editor.c | 36 ++++++++++++++++++++++++++++++++----
 3 files changed, 56 insertions(+), 13 deletions(-)

diff --git a/src/render.c b/src/render.c
index 45c825e..651a262 100644
--- a/src/render.c
+++ b/src/render.c
@@ -1,7 +1,7 @@
 /*
  * render.c
  *
- * Copyright © 2013-2014 Thomas White <taw@bitwiz.org.uk>
+ * Copyright © 2013-2015 Thomas White <taw@bitwiz.org.uk>
  *
  * This file is part of Colloquium.
  *
@@ -381,21 +381,17 @@ static int draw_frame(cairo_t *cr, struct frame *fr, ImageStore *is,
 }
 
 
-static int recursive_wrap_and_draw(struct frame *fr, cairo_t *cr,
-                                   ImageStore *is, enum is_size isz)
+int recursive_draw(struct frame *fr, cairo_t *cr,
+                   ImageStore *is, enum is_size isz)
 {
 	int i;
 
-	/* Wrap boxes -> wrap lines */
-	wrap_contents(fr);
-
-	/* Actually draw the lines */
 	draw_frame(cr, fr, is, isz);
 
 	for ( i=0; i<fr->num_children; i++ ) {
 		cairo_save(cr);
 		cairo_translate(cr, fr->children[i]->x, fr->children[i]->y);
-		recursive_wrap_and_draw(fr->children[i], cr, is, isz);
+		recursive_draw(fr->children[i], cr, is, isz);
 		cairo_restore(cr);
 	}
 
@@ -403,6 +399,21 @@ static int recursive_wrap_and_draw(struct frame *fr, cairo_t *cr,
 }
 
 
+static int recursive_wrap(struct frame *fr, ImageStore *is, enum is_size isz)
+{
+	int i;
+
+	/* Wrap boxes -> wrap lines */
+	wrap_contents(fr);
+
+	for ( i=0; i<fr->num_children; i++ ) {
+		recursive_wrap(fr->children[i], is, isz);
+	}
+
+	return 0;
+}
+
+
 static struct frame *render_sc_to_surface(SCBlock *scblocks, cairo_surface_t *surf,
                                  cairo_t *cr, double log_w, double log_h,
                                  SCBlock **stylesheets, SCCallbackList *cbl,
@@ -460,7 +471,8 @@ static struct frame *render_sc_to_surface(SCBlock *scblocks, cairo_surface_t *su
 		}
 	}
 	sc_interp_add_blocks(scin, scblocks);
-	recursive_wrap_and_draw(top, cr, is, isz);
+	recursive_wrap(top, is, isz);
+	recursive_draw(top, cr, is, isz);
 
 	sc_interp_destroy(scin);
 	cairo_font_options_destroy(fopts);
diff --git a/src/render.h b/src/render.h
index 3938ca1..caab9ab 100644
--- a/src/render.h
+++ b/src/render.h
@@ -40,4 +40,7 @@ extern cairo_surface_t *render_sc(SCBlock *scblocks, int w, int h,
 
 extern int export_pdf(struct presentation *p, const char *filename);
 
+extern int recursive_draw(struct frame *fr, cairo_t *cr,
+                          ImageStore *is, enum is_size isz);
+
 #endif	/* RENDER_H */
diff --git a/src/sc_editor.c b/src/sc_editor.c
index b9a0032..c8ef09a 100644
--- a/src/sc_editor.c
+++ b/src/sc_editor.c
@@ -43,6 +43,7 @@
 #include "sc_interp.h"
 #include "sc_editor.h"
 #include "slideshow.h"
+#include "shape.h"
 
 
 G_DEFINE_TYPE(SCEditor, sc_editor, GTK_TYPE_DRAWING_AREA);
@@ -559,6 +560,31 @@ void insert_scblock(SCBlock *scblock, SCEditor *e)
 }
 
 
+/* The StoryCode for this box on this line in this frame has changed.
+ * Update the boxes from the StoryCode */
+static void update_local(SCEditor *e, struct frame *fr, int line, int bn)
+{
+	struct wrap_box *box = &fr->lines[line].boxes[bn];
+	cairo_t *cr;
+
+	/* Shape the box again */
+	shape_box(box);
+
+	/* Wrap the paragraph again */
+	wrap_contents(fr);  /* FIXME: Only the current paragraph */
+
+	/* Render the lines again */
+	if ( e->surface != NULL ) {
+		cairo_surface_destroy(e->surface);
+	}
+	e->surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, e->w, e->h);
+	cr = cairo_create(e->surface);
+	cairo_scale(cr, e->w/e->log_w, e->h/e->log_h);
+	recursive_draw(e->top, cr, e->is, ISZ_EDITOR);
+	cairo_destroy(cr);
+}
+
+
 static void insert_text(char *t, SCEditor *e)
 {
 	int sln, sbx, sps;
@@ -588,11 +614,13 @@ static void insert_text(char *t, SCEditor *e)
 
 	fr->empty = 0;
 
-	full_rerender(e); /* FIXME: No need for full */
+	update_local(e, fr, sln, sbx);
 
-	//fixup_cursor(e);
-	//advance_cursor(e);
-	//sc_editor_redraw(e);
+	/* ... by doing this properly */
+	fixup_cursor(e);
+	advance_cursor(e);
+
+	sc_editor_redraw(e);
 }
 
 
-- 
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