From d78ae64f0682a4aef09e9ff77e8748af9b2380b9 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Sun, 4 May 2014 21:35:42 -0400
Subject: refactor

---
 src/display.c     |  8 ++++----
 src/pty-unix.c    |  4 ++--
 src/screen.h      |  2 --
 src/window-xlib.c | 37 +++++++++++++++++++++++++------------
 src/window-xlib.h |  2 ++
 5 files changed, 33 insertions(+), 20 deletions(-)

diff --git a/src/display.c b/src/display.c
index 95c13e8..7c8d063 100644
--- a/src/display.c
+++ b/src/display.c
@@ -120,7 +120,7 @@ void runes_display_draw_cursor(RunesTerm *t, cairo_t *cr)
             cairo_rectangle(
                 cr,
                 col * t->fontx + 0.5,
-                (row + t->scr.row_visible_offset) * t->fonty + 0.5,
+                (row + t->w.row_visible_offset) * t->fonty + 0.5,
                 t->fontx - 1, t->fonty - 1);
             cairo_stroke(cr);
         }
@@ -130,13 +130,13 @@ void runes_display_draw_cursor(RunesTerm *t, cairo_t *cr)
             cairo_rectangle(
                 cr,
                 col * t->fontx,
-                (row + t->scr.row_visible_offset) * t->fonty,
+                (row + t->w.row_visible_offset) * t->fonty,
                 t->fontx, t->fonty);
             cairo_fill(cr);
             runes_display_draw_glyph(
                 t, cr, t->config.bgdefault, cell->attrs,
                 cell->contents, cell->len,
-                row + t->scr.row_visible_offset, col);
+                row + t->w.row_visible_offset, col);
         }
         cairo_restore(cr);
     }
@@ -183,7 +183,7 @@ static void runes_display_recalculate_font_metrics(RunesTerm *t)
 
 static int runes_display_draw_cell(RunesTerm *t, int row, int col)
 {
-    struct runes_cell *cell = &t->scr.grid->rows[row + t->scr.grid->row_top - t->scr.row_visible_offset].cells[col];
+    struct runes_cell *cell = &t->scr.grid->rows[row + t->scr.grid->row_top - t->w.row_visible_offset].cells[col];
     cairo_pattern_t *bg = NULL, *fg = NULL;
     int bg_is_custom = 0, fg_is_custom = 0;
 
diff --git a/src/pty-unix.c b/src/pty-unix.c
index 3faeb7f..59636e7 100644
--- a/src/pty-unix.c
+++ b/src/pty-unix.c
@@ -109,8 +109,8 @@ void runes_pty_backend_set_window_size(RunesTerm *t)
 void runes_pty_backend_write(RunesTerm *t, char *buf, size_t len)
 {
     write(t->pty.master, buf, len);
-    if (t->scr.row_visible_offset != 0) {
-        t->scr.row_visible_offset = 0;
+    if (t->w.row_visible_offset != 0) {
+        t->w.row_visible_offset = 0;
         t->scr.dirty = 1;
         runes_window_backend_request_flush(t);
     }
diff --git a/src/screen.h b/src/screen.h
index b18d2b5..3132e8a 100644
--- a/src/screen.h
+++ b/src/screen.h
@@ -81,8 +81,6 @@ struct runes_screen {
     char *icon_name;
     size_t icon_name_len;
 
-    int row_visible_offset;
-
     struct runes_cell_attrs attrs;
 
     unsigned char hide_cursor: 1;
diff --git a/src/window-xlib.c b/src/window-xlib.c
index 485a3fd..ee4beaa 100644
--- a/src/window-xlib.c
+++ b/src/window-xlib.c
@@ -83,6 +83,7 @@ static Bool runes_window_backend_find_flush_events(
 static void runes_window_backend_resize_window(
     RunesTerm *t, int width, int height);
 static void runes_window_backend_flush(RunesTerm *t);
+static void runes_window_backend_visible_scroll(RunesTerm *t, int count);
 static void runes_window_backend_visual_bell(RunesTerm *t);
 static void runes_window_backend_reset_visual_bell(uv_timer_t *handle);
 static void runes_window_backend_visual_bell_free_handle(uv_handle_t *handle);
@@ -496,6 +497,28 @@ static void runes_window_backend_flush(RunesTerm *t)
     cairo_surface_flush(cairo_get_target(w->backend_cr));
 }
 
+static void runes_window_backend_visible_scroll(RunesTerm *t, int count)
+{
+    RunesWindowBackend *w = &t->w;
+    int min = 0, max = t->scr.grid->row_count - t->scr.grid->max.row;
+    int old_offset = w->row_visible_offset;
+
+    w->row_visible_offset += count;
+    if (w->row_visible_offset < min) {
+        w->row_visible_offset = min;
+    }
+    if (w->row_visible_offset > max) {
+        w->row_visible_offset = max;
+    }
+
+    if (w->row_visible_offset == old_offset) {
+        return;
+    }
+
+    t->scr.dirty = 1;
+    runes_window_backend_flush(t);
+}
+
 static void runes_window_backend_visual_bell(RunesTerm *t)
 {
     if (t->config.bell_is_urgent) {
@@ -759,20 +782,10 @@ static int runes_window_backend_handle_builtin_button_press(
         return 1;
         break;
     case Button4:
-        t->scr.row_visible_offset += t->config.scroll_lines;
-        if (t->scr.row_visible_offset > t->scr.grid->row_count - t->scr.grid->max.row) {
-            t->scr.row_visible_offset = t->scr.grid->row_count - t->scr.grid->max.row;
-        }
-        t->scr.dirty = 1;
-        runes_window_backend_flush(t);
+        runes_window_backend_visible_scroll(t, t->config.scroll_lines);
         break;
     case Button5:
-        t->scr.row_visible_offset -= t->config.scroll_lines;
-        if (t->scr.row_visible_offset < 0) {
-            t->scr.row_visible_offset = 0;
-        }
-        t->scr.dirty = 1;
-        runes_window_backend_flush(t);
+        runes_window_backend_visible_scroll(t, -t->config.scroll_lines);
         break;
     default:
         break;
diff --git a/src/window-xlib.h b/src/window-xlib.h
index 123c12a..1989cfd 100644
--- a/src/window-xlib.h
+++ b/src/window-xlib.h
@@ -25,6 +25,8 @@ struct runes_window {
 
     cairo_t *backend_cr;
 
+    int row_visible_offset;
+
     Atom atoms[RUNES_NUM_ATOMS];
 };
 
-- 
cgit v1.2.3-54-g00ecf