Initial revision

diff --git a/scrollbar.c b/scrollbar.c
new file mode 100644 (file)
index 0000000..66632dd
--- /dev/null
+++ b/scrollbar.c
@@ -0,0 +1,95 @@
+#include <slang/slang.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "newt.h"
+#include "newt_pr.h"
+
+struct scrollbar {
+    int curr;
+    int cs, csThumb;
+} ;
+
+static void sbDraw(newtComponent co);
+static void sbDestroy(newtComponent co);
+static void sbDrawThumb(newtComponent co, int isOn);
+
+static struct componentOps sbOps = {
+    sbDraw,
+    newtDefaultEventHandler,
+    sbDestroy,
+} ;
+
+void newtScrollbarSet(newtComponent co, int where, int total) {
+    struct scrollbar * sb = co->data;
+    int new;
+
+    new = (where * (co->height - 1)) / total;
+    if (new != sb->curr) {
+       sbDrawThumb(co, 0);
+       sb->curr = new;
+       sbDrawThumb(co, 1);
+    }
+}
+
+newtComponent newtVerticalScrollbar(int left, int top, int height,
+                                   int normalColorset, int thumbColorset) {
+    newtComponent co;
+    struct scrollbar * sb;
+
+    co = malloc(sizeof(*co));
+    sb = malloc(sizeof(*sb));
+    co->data = sb;
+
+    sb->curr = 0;
+    sb->cs = normalColorset;
+    sb->csThumb = thumbColorset;
+
+    co->ops = &sbOps;
+    co->left = left;
+    co->top = top;
+    co->height = height;
+    co->width = 1;
+    co->takesFocus = 0;  
+    
+    return co;
+}
+
+static void sbDraw(newtComponent co) {
+    struct scrollbar * sb = co->data;
+    int i;
+
+    SLsmg_set_color(sb->cs);
+
+    SLsmg_set_char_set(1);
+    for (i = 0; i < co->height; i++) {
+       newtGotorc(i + co->top, co->left);
+       SLsmg_write_char('\150');
+    }
+
+    SLsmg_set_char_set(0);
+
+    sbDrawThumb(co, 1);
+}
+
+static void sbDrawThumb(newtComponent co, int isOn) {
+    struct scrollbar * sb = co->data;
+
+    newtGotorc(sb->curr + co->top, co->left);
+    SLsmg_set_char_set(1);
+
+    if (isOn)
+       SLsmg_set_color(sb->csThumb);
+    else
+       SLsmg_set_color(sb->cs);
+
+    SLsmg_write_char('\150');
+    SLsmg_set_char_set(0);
+}
+
+static void sbDestroy(newtComponent co) {
+    struct scrollbar * sb = co->data;
+ 
+    free(sb);
+    free(co);
+}