Touchscreen: Show a line separator in lists.

This patch adds a configurable line separator between list items, very
similar to lists in Android. Additionally, below the list item there is a
thicker line. It can be disabled in the settings. Its color can
be configured as well.

Remote and monochrome displays are explicitly unsupported. If there is desire
this can be changed but it doesn't seem useful to me.

Change-Id: I005313b0d8f5ecd15864bf20e66ea4e3390d8b7d

3 files changed, 42 insertions, 6 deletions

diff --git a/apps/gui/bitmap/list.c b/apps/gui/bitmap/list.c
index f1def90..97eefce 100644
--- a/apps/gui/bitmap/list.c
+++ b/apps/gui/bitmap/list.c
@@ -106,6 +106,13 @@ static bool draw_title(struct screen *display, struct gui_synclist *list)
     line.height = list->line_height[screen];
     title_text_vp->height = line.height;
 
+#if LCD_DEPTH > 1
+    /* XXX: Do we want to support the separator on remote displays? */
+    if (display->screen_type == SCREEN_MAIN && global_settings.list_separator_height != 0)
+        line.separator_height = abs(global_settings.list_separator_height)
+                                + (lcd_get_dpi() > 200 ? 2 : 1);
+#endif
+
 #ifdef HAVE_LCD_COLOR
     if (list->title_color >= 0)
         line.style |= (STYLE_COLORED|list->title_color);
@@ -154,7 +161,11 @@ void list_draw(struct screen *display, struct gui_synclist *list)
 
     linedes.height = list->line_height[screen];
     linedes.nlines = list->selected_size;
-
+#if LCD_DEPTH > 1
+    /* XXX: Do we want to support the separator on remote displays? */
+    if (display->screen_type == SCREEN_MAIN)
+        linedes.separator_height = abs(global_settings.list_separator_height);
+#endif
     start = list_start_item;
     end = start + nb_lines;
 
diff --git a/apps/gui/line.c b/apps/gui/line.c
index 55100f7..4a51c6e 100644
--- a/apps/gui/line.c
+++ b/apps/gui/line.c
@@ -305,6 +305,28 @@ static void style_line(struct screen *display,
     int style = line->style;
     int width = display->getwidth();
     int height = line->height == -1 ? display->getcharheight() : line->height;
+    int bar_height = height;
+
+    /* mask out gradient and colorbar styles for non-color displays */
+    if (display->depth < 16 && (style & (STYLE_COLORBAR|STYLE_GRADIENT)))
+    {
+        style &= ~(STYLE_COLORBAR|STYLE_GRADIENT);
+        style |= STYLE_INVERT;
+    }
+
+    if (line->separator_height > 0 && (line->line == line->nlines-1))
+    {
+        int sep_height = MIN(line->separator_height, height);
+        display->set_drawmode(DRMODE_FG);
+#if LCD_DEPTH > 1
+        display->set_foreground(global_settings.list_separator_color);
+#endif
+        display->fillrect(x, y + height - sep_height, width, sep_height);
+        bar_height -= sep_height;
+#if LCD_DEPTH > 1
+        display->set_foreground(global_settings.fg_color);
+#endif
+    }
 
     /* mask out gradient and colorbar styles for non-color displays */
     if (display->depth < 16)
@@ -322,7 +344,7 @@ static void style_line(struct screen *display,
 #ifdef HAVE_LCD_COLOR
         case STYLE_GRADIENT:
             display->set_drawmode(DRMODE_FG);
-            display->gradient_fillrect_part(x, y, width, height,
+            display->gradient_fillrect_part(x, y, width, bar_height,
                                             line->line_color,
                                             line->line_end_color,
                                             height*line->nlines,
@@ -331,16 +353,16 @@ static void style_line(struct screen *display,
         case STYLE_COLORBAR:
             display->set_drawmode(DRMODE_FG);
             display->set_foreground(line->line_color);
-            display->fillrect(x, y, width - x, height);
+            display->fillrect(x, y, width - x, bar_height);
             break;
 #endif
         case STYLE_INVERT:
             display->set_drawmode(DRMODE_FG);
-            display->fillrect(x, y, width - x, height);
+            display->fillrect(x, y, width - x, bar_height);
             break;
         case STYLE_DEFAULT: default:
             display->set_drawmode(DRMODE_BG | DRMODE_INVERSEVID);
-            display->fillrect(x, y, width - x, height);
+            display->fillrect(x, y, width - x, bar_height);
             break;
         case STYLE_NONE:
             break;
diff --git a/apps/gui/line.h b/apps/gui/line.h
index 9a0769d..c14f04d 100644
--- a/apps/gui/line.h
+++ b/apps/gui/line.h
@@ -74,11 +74,14 @@ struct line_desc {
     enum line_styles style;
     /* whether the line can scroll */
     bool scroll;
+    /* height of the line separator (in pixels). 0 to disable drawing
+     * of the separator */
+    int8_t separator_height;
 };
 
 /* default initializer, can be used for static initialitation also.
  * This initializer will result in single lines without style that don't scroll */
-#define LINE_DESC_DEFINIT { .style = STYLE_DEFAULT, .height = -1, .line = 0, .nlines = 1, .scroll = false }
+#define LINE_DESC_DEFINIT { .style = STYLE_DEFAULT, .height = -1, .separator_height = 0, .line = 0, .nlines = 1, .scroll = false }
 
 /**
  * Print a line at a given pixel postion, using decoration information from