Fix Fl_Browser::textsize(int) to adjust the scrollbars (STR #3057).

Setting a different text size didn't affect the scrollbars.

Port of branch-1.3, r11453 and r11464.


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11465 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

FL/Fl_Browser.H

@@ -3,7 +3,7 @@
 //
 // Browser header file for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2011 by Bill Spitzak and others.
+// Copyright 1998-2016 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -141,6 +141,17 @@ public:
   int size() const { return lines; }
   void size(int W, int H) { Fl_Widget::size(W, H); }
 
+  /**
+    Gets the default text size (in pixels) for the lines in the browser.
+  */
+  Fl_Fontsize textsize() const { return Fl_Browser_::textsize(); }
+
+  /*
+    Sets the default text size for the lines in the browser to newSize.
+    Defined and documented in Fl_Browser.cxx
+  */
+  void textsize(Fl_Fontsize newSize);
+
   int topline() const ;
   /** For internal use only? */
   enum Fl_Line_Position { TOP, BOTTOM, MIDDLE };

FL/Fl_Browser_.H

@@ -3,7 +3,7 @@
 //
 // Common browser header file for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2010 by Bill Spitzak and others.
+// Copyright 1998-2016 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this

src/Fl_Browser.cxx

@@ -3,7 +3,7 @@
 //
 // Browser widget for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2010 by Bill Spitzak and others.
+// Copyright 1998-2016 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -650,6 +650,34 @@ int Fl_Browser::topline() const {
   return lineno(top());
 }
 
+/**
+  Sets the default text size (in pixels) for the lines in the browser to \p newSize.
+
+  This method recalculates all item heights and caches the total height
+  internally for optimization of later item changes. This can be slow
+  if there are many items in the browser.
+
+  It returns immediately (w/o recalculation) if \p newSize equals
+  the current textsize().
+
+  You \e may need to call redraw() to see the effect and to have the
+  scrollbar positions recalculated.
+
+  You should set the text size \e before populating the browser with items
+  unless you really need to \e change the size later.
+*/
+void Fl_Browser::textsize(Fl_Fontsize newSize) {
+  if (newSize == textsize())
+    return; // avoid recalculation
+  Fl_Browser_::textsize(newSize);
+  new_list();
+  full_height_ = 0;
+  if (lines == 0) return;
+  for (FL_BLINE* itm=(FL_BLINE *)item_first(); itm; itm=(FL_BLINE *)item_next(itm)) {
+    full_height_ += item_height(itm);
+  }
+}
+
 /**
   Removes all the lines in the browser.
   \see add(), insert(), remove(), swap(int,int), clear()

src/Fl_Browser_.cxx

@@ -113,6 +113,7 @@ void Fl_Browser_::resize(int X, int Y, int W, int H) {
   hscrollbar.resize(
 	X, scrollbar.align()&FL_ALIGN_TOP ? Y-scrollsize : Y+H,
 	W, scrollsize);
+  max_width = 0;
 }
 
 // Cause minimal update to redraw the given item: