STR 3460.C: Code Properties remembers the editor's scroll bar position.

fluid/CodeEditor.h

@@ -51,6 +51,8 @@ public:
   ~CodeEditor();
   int top_line() { return get_absolute_top_line_number(); }
   void textsize(Fl_Fontsize s);
+  int scroll_row() { return mTopLineNum; }
+  int scroll_col() { return mHorizOffset; }
 };
 
 // ---- CodeViewer declaration

fluid/Fl_Function_Type.cxx

@@ -529,10 +529,6 @@ int Fl_Function_Type::has_signature(const char *rtype, const char *sig) const {
  This node manages an arbitrary block of code inside a function that will
  be written into the source code file. Fl_Code_Block has no comment field.
  However, the first line of code will be shown in the widget browser.
-
- \todo Fl_Code_Block stores the cursor position in text editor, but it does not
-    store the view position (scrollbars). Make sure that we can always see
-    the cursor when opening the dialog. (it's not stored in the .fl file)
  */
 
 /// Prototype for code to be used by the factory.
@@ -541,9 +537,11 @@ Fl_Code_Type Fl_Code_type;
 /**
  Constructor.
  */
-Fl_Code_Type::Fl_Code_Type() {
+Fl_Code_Type::Fl_Code_Type() :
-  cursor_position_ = 0;
+  cursor_position_(0),
-}
+  code_input_scroll_row(0),
+  code_input_scroll_col(0)
+{}
 
 /**
  Make a new code node.
@@ -580,6 +578,7 @@ void Fl_Code_Type::open() {
   const char *text = name();
   code_input->buffer()->text( text ? text : "" );
   code_input->insert_position(cursor_position_);
+  code_input->scroll(code_input_scroll_row, code_input_scroll_col);
   code_panel->show();
   const char* message = 0;
   for (;;) { // repeat as long as there are errors
@@ -597,6 +596,8 @@ void Fl_Code_Type::open() {
     break;
   }
   cursor_position_ = code_input->insert_position();
+  code_input_scroll_row = code_input->scroll_row();
+  code_input_scroll_col = code_input->scroll_col();
 BREAK2:
   code_panel->hide();
 }

fluid/Fl_Function_Type.h

@@ -72,6 +72,8 @@ public:
 class Fl_Code_Type : public Fl_Type {
   ExternalCodeEditor editor_;
   int cursor_position_;
+  int code_input_scroll_row;
+  int code_input_scroll_col;
 
 public:
   Fl_Code_Type();

src/Fl_Text_Display.cxx

@@ -4146,18 +4146,25 @@ int Fl_Text_Display::handle(int event) {
 
 /*
  Convert an x pixel position into a column number.
+ The width of a column is calculated as the average width of a few
+ representative characters, giving a good estimate for proportional fonts.
+ This method does not take the possition of the scroll bars into account.
+ \param[in] x offset to the left edge of the text in FLTK units.
+ \return approximation to the corresponding text column
+ \see col_to_x()
  */
-double Fl_Text_Display::x_to_col(double y) const
+double Fl_Text_Display::x_to_col(double x) const
 {
   if (!mColumnScale) {
     mColumnScale = string_width("Mitg", 4, 'A') / 4.0;
   }
-  return (y/mColumnScale)+0.5;
+  return (x/mColumnScale)+0.5;
 }
 
 
 /**
  Convert a column number into an x pixel position.
+ \see x_to_col()
  */
 double Fl_Text_Display::col_to_x(double col) const
 {