From 7e4b9f81865ce98ae7ab1cc3696a7adb192df0cc Mon Sep 17 00:00:00 2001
From: Hisham <hisham@gobolinux.org>
Date: Wed, 23 Nov 2016 23:45:58 -0200
Subject: [PATCH] Double the resolution of the scroll bar

---
 CRT.c        | 40 +++++++++++++++++++++++++++++++---------
 Panel.c      | 35 +++++++++++++++++++++++++----------
 Structures.h | 12 ++++++++++--
 configure.ac |  2 +-
 4 files changed, 67 insertions(+), 22 deletions(-)

diff --git a/CRT.c b/CRT.c
index e735619..47fd7a2 100644
--- a/CRT.c
+++ b/CRT.c
@@ -52,6 +52,8 @@ typedef enum {
    DimColor,
    ScrollBarColor,
    ScrollHandleColor,
+   ScrollHandleTopColor,
+   ScrollHandleBottomColor,
    HeaderColor,
    StatusColor,
    KeyColor,
@@ -101,11 +103,17 @@ typedef enum {
 #define CTRL_MASK 4
 #define ALTL_MASK 8
 
+extern bool CRT_linuxConsole;
+
 extern int CRT_delay;
 
-extern char CRT_scrollHandle;
+extern char* CRT_scrollHandle;
+
+extern char* CRT_scrollHandleTop;
+
+extern char* CRT_scrollHandleBottom;
 
-extern char CRT_scrollBar;
+extern char* CRT_scrollBar;
 
 extern int CRT_colors[Colors];
 
@@ -121,9 +129,13 @@ bool CRT_hasColors;
 
 int CRT_delay;
 
-char CRT_scrollHandle;
+char* CRT_scrollHandle;
 
-char CRT_scrollBar;
+char* CRT_scrollHandleTop;
+
+char* CRT_scrollHandleBottom;
+
+char* CRT_scrollBar;
 
 int CRT_colors[Colors];
 
@@ -172,11 +184,15 @@ void CRT_init() {
    
    CRT_hasColors = Display_init(term);
    if (CRT_hasColors) {
-      CRT_scrollHandle = ' ';
-      CRT_scrollBar = ' ';
+      CRT_scrollHandle = strdup("█");
+      CRT_scrollHandleTop = strdup("▀");
+      CRT_scrollHandleBottom = strdup("▄");
+      CRT_scrollBar = strdup(" ");
    } else {
-      CRT_scrollHandle = '*';
-      CRT_scrollBar = '|';
+      CRT_scrollHandle = strdup("*");
+      CRT_scrollHandleTop = strdup("*");
+      CRT_scrollHandleBottom = strdup("*");
+      CRT_scrollBar = strdup("|");
    }
 
    #define ANTARCTIC_THEME
@@ -204,7 +220,9 @@ void CRT_init() {
    CRT_colors[VerySpecialColor] = A_BOLD | CRT_color(Yellow, Red);
    CRT_colors[DimColor] = CRT_color(Yellow, Black);
    CRT_colors[ScrollBarColor] = CRT_color(White, Blue);
-   CRT_colors[ScrollHandleColor] = CRT_color(White, Cyan);
+   CRT_colors[ScrollHandleColor] = CRT_color(Cyan, Blue);
+   CRT_colors[ScrollHandleTopColor] = CRT_color(Cyan, Blue);
+   CRT_colors[ScrollHandleBottomColor] = CRT_color(Cyan, Blue);
    CRT_colors[StatusColor] = CRT_color(Black, Cyan);
    CRT_colors[KeyColor] = A_REVERSE | CRT_color(Black, White);
    CRT_colors[FieldColor] = CRT_color(White, Blue);
@@ -489,6 +507,10 @@ void CRT_init() {
 }
 
 void CRT_done() {
+   free(CRT_scrollHandle);
+   free(CRT_scrollHandleTop);
+   free(CRT_scrollHandleBottom);
+   free(CRT_scrollBar);
    Hashtable_delete(CRT_keys);
    Display_done();
 }
diff --git a/Panel.c b/Panel.c
index 61904d6..dfba9b2 100644
--- a/Panel.c
+++ b/Panel.c
@@ -282,23 +282,38 @@ void Panel_draw(Panel* this) {
 
       /* paint scrollbar */
       {
-         float step = (float)h / (float) itemCount ;
-         int handleHeight = ceil(step * (float)h);
-         int startAt = step * (float)this->scrollV;
+         int nBlocks = h * 2;
+         float linesPerBlock = (float)itemCount / (float)nBlocks;
+         int handleHeight = ceil((float)h / linesPerBlock);
+         int startAt = (float)this->scrollV / linesPerBlock;
          Color bar = CRT_colors[ScrollBarColor];
          Color handle = CRT_colors[ScrollHandleColor];
-         for (int i = 0; i < h; i++) {
-            char ch;
+         Color handleTop = CRT_colors[ScrollHandleTopColor];
+         Color handleBottom = CRT_colors[ScrollHandleBottomColor];
+         RichString_begin(barStr);
+         for (int i = 0; i < nBlocks; i += 2) {
+            bool set1 = false;
+            bool set2 = false;
             if (i >= startAt && handleHeight) {
-               Display_attrset(handle);
-               ch = CRT_scrollHandle;
+               set1 = true;
                handleHeight--;
+            }
+            if (i+1 >= startAt && handleHeight) {
+               set2 = true;
+               handleHeight--;
+            }
+            if (set1 && set2) {
+               RichString_write(&barStr, handle, CRT_scrollHandle);
+            } else if (set1) {
+               RichString_write(&barStr, handleTop, CRT_scrollHandleTop);
+            } else if (set2) {
+               RichString_write(&barStr, handleBottom, CRT_scrollHandleBottom);
             } else {
-               Display_attrset(bar);
-               ch = CRT_scrollBar;
+               RichString_write(&barStr, bar, CRT_scrollBar);
             }
-            Display_writeChAt(y + i, w, ch);
+            Display_writeChstrAtn(y + (i/2), w, RichString_at(barStr, 0), 1);
          }
+         RichString_end(barStr);
          Display_attrset(this->color);
       }
 
diff --git a/Structures.h b/Structures.h
index 5e5dbe7..0263eec 100644
--- a/Structures.h
+++ b/Structures.h
@@ -289,6 +289,8 @@ typedef enum {
    DimColor,
    ScrollBarColor,
    ScrollHandleColor,
+   ScrollHandleTopColor,
+   ScrollHandleBottomColor,
    HeaderColor,
    StatusColor,
    KeyColor,
@@ -338,11 +340,17 @@ typedef enum {
 #define CTRL_MASK 4
 #define ALTL_MASK 8
 
+extern bool CRT_linuxConsole;
+
 extern int CRT_delay;
 
-extern char CRT_scrollHandle;
+extern char* CRT_scrollHandle;
+
+extern char* CRT_scrollHandleTop;
+
+extern char* CRT_scrollHandleBottom;
 
-extern char CRT_scrollBar;
+extern char* CRT_scrollBar;
 
 extern int CRT_colors[Colors];
 
diff --git a/configure.ac b/configure.ac
index 983a0b6..b133bc0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -122,7 +122,7 @@ then
       enable_bundled_lua=yes
    else
       AX_LUA_HEADERS
-      AX_LUA_TRY_LIB_VERSION([501], [503], [], [enable_bundled_lua="yes"])
+      AX_LUA_TRY_LIB_VERSION([501], [504], [], [enable_bundled_lua="yes"])
    fi
 fi