Tab is now alway 8 characters wide.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7896 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

3 files changed, 14 insertions, 9 deletions

diff --git a/FL/Fl_Text_Display.H b/FL/Fl_Text_Display.H
index 0812fe52a..ae5356c00 100644
--- a/FL/Fl_Text_Display.H
+++ b/FL/Fl_Text_Display.H
@@ -287,7 +287,7 @@ public:
    \param x number of pixels form the left margin
    \return an approximate column number based on the main font
    */
-  double x_to_col(double y);
+  double x_to_col(double y) const;
   
   /**
    Convert a column number into an x pixel position.
@@ -295,7 +295,7 @@ public:
    \return number of pixels form the left margin to the left of an average 
             sized character
    */
-  double col_to_x(double col);
+  double col_to_x(double col) const;
   
 protected:
   // Most (all?) of this stuff should only be called from resize() or
@@ -445,7 +445,10 @@ protected:
   int mModifyingTabDistance;    /* Whether tab distance is being
                                  modified */
   
-  double mColumnScale;          /* Width in pixels of an average character */
+  mutable double mColumnScale; /* Width in pixels of an average character. This
+                                 value is calculated as needed (lazy eval); it 
+                                 needs to be mutable so that it can be calculated
+                                 within a method marked as "const" */
   
   Fl_Color mCursor_color;
   
diff --git a/src/Fl_Text_Display.cxx b/src/Fl_Text_Display.cxx
index 99bf82749..cd3ff4e67 100644
--- a/src/Fl_Text_Display.cxx
+++ b/src/Fl_Text_Display.cxx
@@ -1750,8 +1750,9 @@ int Fl_Text_Display::handle_vline(
       int w = 0;
       if (prevChar=='\t') {
         // draw a single Tab space
+        int tab = col_to_x(8);
         int xAbs = (mode==GET_WIDTH) ? startX : startX+mHorizOffset-text_area.x;
-        w = (((xAbs/100)+1)*100) - xAbs;
+        w = (((xAbs/tab)+1)*tab) - xAbs;
         if (mode==DRAW_LINE)
           draw_string( style|BG_ONLY_MASK, startX, Y, startX+w, 0, 0 );
         if (mode==FIND_INDEX && startX+w>rightClip) {
@@ -1782,8 +1783,9 @@ int Fl_Text_Display::handle_vline(
   int w = 0;
   if (currChar=='\t') {
     // draw a single Tab space
+    int tab = col_to_x(8);
     int xAbs = (mode==GET_WIDTH) ? startX : startX+mHorizOffset-text_area.x;
-    w = (((xAbs/100)+1)*100) - xAbs;
+    w = (((xAbs/tab)+1)*tab) - xAbs;
     if (mode==DRAW_LINE)
       draw_string( style|BG_ONLY_MASK, startX, Y, startX+w, 0, 0 );
     if (mode==FIND_INDEX) {
@@ -3759,7 +3761,7 @@ int Fl_Text_Display::handle(int event) {
 /*
  Convert an x pixel position into a column number.
  */
-double Fl_Text_Display::x_to_col(double y)
+double Fl_Text_Display::x_to_col(double y) const
 {
   if (!mColumnScale) {
     mColumnScale = string_width("Mitg", 4, 'A') / 4.0;
@@ -3769,9 +3771,9 @@ double Fl_Text_Display::x_to_col(double y)
 
 
 /**
- Convert a column number into an y pixel position.
+ Convert a column number into an x pixel position.
  */
-double Fl_Text_Display::col_to_x(double col)
+double Fl_Text_Display::col_to_x(double col) const
 {
   if (!mColumnScale) {
     // recalculate column scale value
diff --git a/test/editor.cxx b/test/editor.cxx
index 49c8d10a9..ff4829eed 100644
--- a/test/editor.cxx
+++ b/test/editor.cxx
@@ -775,7 +775,7 @@ Fl_Window* new_view() {
     w->editor = new Fl_Text_Editor(0, 30, 660, 370);
     w->editor->textfont(FL_COURIER);
     w->editor->textsize(TS);
-    //w->editor->wrap_mode(Fl_Text_Editor::WRAP_AT_BOUNDS, 100);
+  w->editor->wrap_mode(Fl_Text_Editor::WRAP_AT_BOUNDS, 250);
     w->editor->buffer(textbuf);
   w->editor->textfont(FL_HELVETICA);
   textbuf->text(