[Change] Cleaned up the scrollbar renderer.

src/toolkit.c

@@ -71,6 +71,7 @@ typedef struct Widget_ {
       int selected;   /* Currently selected option. */
       int pos;    /* Current topmost option (in view). */
       void (*fptr) (unsigned int, char*); /* Modify callback. */
+      int height; /**< Real height. */
     } lst;
     /* Widget rect. */
     struct {
@@ -172,6 +173,7 @@ static void toolkit_renderInput(Widget* inp, double bx, double by);
 static void toolkit_renderImageArray(Widget* iar, double bx, double by);
 static void toolkit_drawOutline(double x, double y, double w,
                                 double h, double b, glColour* c, glColour* lc);
+static void toolkit_drawScrollbar(double x, double y, double w, double h, double pos);
 static void toolkit_clip(double x, double y, double w, double h);
 static void toolkit_unclip(void);
 static void toolkit_drawRect(double x, double y, double w, double h,
@@ -288,6 +290,12 @@ void window_addList(const unsigned int wid, const int x, const int y,
   wgt->h = (double) h - ((h % (gl_defFont.h+2)) + 2);
   toolkit_setPos(wdw, wgt, x, y);
 
+  /* Check if needs scrollbar. */
+  if(2 + (nitems * (gl_defFont.h + 2)) > (int)wgt->h)
+    wgt->dat.lst.height = (2 + gl_defFont.h) * nitems + 2;
+  else
+    wgt->dat.lst.height = 0;
+
   if(wdw->focus == -1)
     /* Initialize the focus. */
     toolkit_nextFocus();
@@ -1137,8 +1145,10 @@ static void toolkit_renderImage(Widget* img, double bx, double by) {
 /* Render the list. */
 static void toolkit_renderList(Widget* lst, double bx, double by) {
   int i;
-  double x, y, tx, ty;
+  double x, y, tx, ty, miny;
+  double w, scroll_pos;
 
+  w = lst->w;
   x = bx + lst->x;
   y = by + lst->y;
 
@@ -1150,22 +1160,36 @@ static void toolkit_renderList(Widget* lst, double bx, double by) {
   /* Outter outline. */
   toolkit_drawOutline(x, y, lst->w, lst->h, 1., toolkit_colDark, NULL);
 
+  /* Draw scrollbar. */
+  if(lst->dat.lst.height > 0) {
+    /* We need to make room for list. */
+    w -= 10.;
+
+    scroll_pos = (double)lst->dat.lst.pos / ((double)lst->dat.lst.height - lst->h);
+    toolkit_drawScrollbar(x + lst->w - 10., y, 10., lst->h, scroll_pos);
+  }
+
+
   /* Draw selected. */
   toolkit_drawRect(x,
-                   y-1.+lst->h-(1+lst->dat.lst.selected-lst->dat.lst.pos)*(gl_defFont.h+2.),
-                   lst->w, gl_defFont.h+2., &cHilight, NULL);
+      y-1.+lst->h-(1+lst->dat.lst.selected-lst->dat.lst.pos)*(gl_defFont.h+2.),
+      w, gl_defFont.h+2., &cHilight, NULL);
+
 
   /* Draw content. */
   tx = (double)SCREEN_W/2. + x+2.;
   ty = (double)SCREEN_H/2. + y+lst->h - 2. - gl_defFont.h;
+  miny = ty - lst->h;
   y = ty-2.;
+  w -= 4;
 
   for(i = lst->dat.lst.pos; i < lst->dat.lst.noptions; i++) {
-    gl_printMax(&gl_defFont, (int)lst->w-4,
+    gl_printMax(&gl_defFont, (int)w-4,
                 tx, ty, &cBlack, lst->dat.lst.options[i]);
 
     ty -= 2 + gl_defFont.h;
-    if(ty-y > lst->h) break;
+    /* Check if out if bounds. */
+    if(ty < miny) break;
   }
 }
 
@@ -1242,7 +1266,7 @@ static void toolkit_renderInput(Widget* inp, double bx, double by) {
 static void toolkit_renderImageArray(Widget* iar, double bx, double by) {
   int i, j;
   double x, y, w, h, xcurs, ycurs;
-  double scroll_pos, sx, sy;
+  double scroll_pos;
   int xelem, yelem, xspace;
   glColour* c, *dc, *lc;
   int is_selected;
@@ -1263,21 +1287,8 @@ static void toolkit_renderImageArray(Widget* iar, double bx, double by) {
   toolkit_drawRect(x, y, iar->w, iar->h, &cBlack, NULL);
 
   /* Scrollbar. */
-
-  /* scrollbar background. */
-  toolkit_drawRect(x+iar->w - 10., y, 10., iar->h,
-      toolkit_colDark, toolkit_col);
-  toolkit_drawOutline(x + iar->w - 10., y, 10., iar->h, 1.,
-      toolkit_colLight, toolkit_col);
-  toolkit_drawOutline(x + iar->w - 10., y, 10., iar->h, 2.,
-      toolkit_colDark, NULL);
-
-  /* The bar */
   scroll_pos = iar->dat.iar.pos / (h * (yelem - (int)(iar->h / h)));
-  sx = x + iar->w - 10.;
-  sy = y + iar->h - (iar->h - 30.) * scroll_pos - 30.;
-  toolkit_drawRect(sx, sy, 10., 30., toolkit_colLight, toolkit_col);
-  toolkit_drawOutline(sx, sy, 10., 30., 0., toolkit_colDark, NULL);
+  toolkit_drawScrollbar(x + iar->w - 10., y, 10., iar->h, scroll_pos);
 
   /* Main drawing loop. */
   toolkit_clip(x, y, iar->w, iar->h);
@@ -1335,6 +1346,20 @@ static void toolkit_renderImageArray(Widget* iar, double bx, double by) {
   toolkit_drawOutline(x, y+1, iar->w-1, iar->h-1, 2., toolkit_colDark, NULL);
 }
 
+static void toolkit_drawScrollbar(double x, double y, double w, double h, double pos) {
+  double sy;
+
+  /* Scrollbar background. */
+  toolkit_drawRect(x, y, w, h, toolkit_colDark, toolkit_col);
+  toolkit_drawOutline(x, y, w, h, 1., toolkit_colLight, toolkit_col);
+  toolkit_drawOutline(x, y, w, h, 2., toolkit_colDark, NULL);
+
+  /* Bar itself. */
+  sy = y + (h - 30.) * (1.-pos);
+  toolkit_drawRect(x, sy, w, 30., toolkit_colLight, toolkit_col);
+  toolkit_drawOutline(x, sy, w, 30., 0., toolkit_colDark, NULL);
+}
+
 /* Handle input for input widget. */
 static int toolkit_inputInput(Uint8 type, Widget* inp, SDLKey key) {
   int n;