Fl_Input_: improved draing and warping for large fonts

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6887 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

src/Fl_Input_.cxx

@@ -239,6 +239,7 @@ void Fl_Input_::drawtext(int X, int Y, int W, int H) {
   // count how many lines and put the last one into the buffer:
   // And figure out where the cursor is:
   int height = fl_height();
+  int threshold = height/2;
   int lines;
   int curx, cury;
   for (p=value(), curx=cury=lines=0; ;) {
@@ -248,15 +249,15 @@ void Fl_Input_::drawtext(int X, int Y, int W, int H) {
       if (Fl::focus()==this && !was_up_down) up_down_pos = curx;
       cury = lines*height;
       int newscroll = xscroll_;
-      if (curx > newscroll+W-20) {
+      if (curx > newscroll+W-threshold) {
 	// figure out scrolling so there is space after the cursor:
-	newscroll = curx+20-W;
+	newscroll = curx+threshold-W;
 	// figure out the furthest left we ever want to scroll:
 	int ex = int(expandpos(p, e, buf, 0))+2-W;
 	// use minimum of both amounts:
 	if (ex < newscroll) newscroll = ex;
-      } else if (curx < newscroll+20) {
-	newscroll = curx-20;
+      } else if (curx < newscroll+threshold) {
+	newscroll = curx-threshold;
       }
       if (newscroll < 0) newscroll = 0;
       if (newscroll != xscroll_) {