add multi line string drawing (used in Input Dialog)

src/emucore/FBSurface.cxx

@@ -309,6 +309,74 @@ void FBSurface::frameRect(uInt32 x, uInt32 y, uInt32 w, uInt32 h,
   }
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void FBSurface::wrapString(const string inStr, int pos, string& leftStr, string& rightStr) const
+{
+  int i;
+
+  for(i = pos; i > 0; --i)
+  {
+    if(isWhiteSpace(inStr[i]))
+    {
+      leftStr = inStr.substr(0, i);
+      if(inStr[i] == ' ') // skip leading space after line break
+        i++;
+      rightStr = inStr.substr(i);
+      return;
+    }
+  }
+  leftStr = inStr.substr(0, pos);
+  rightStr = inStr.substr(pos);
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+bool FBSurface::isWhiteSpace(const char s) const
+{
+  const string WHITESPACES = " ,.;:+-";
+  int i;
+
+  for(i = 0; i < WHITESPACES.length(); ++i)
+    if(s == WHITESPACES[i])
+      return true;
+
+  return false;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void FBSurface::drawString(const GUI::Font& font, const string& s,
+  int x, int y, int w, int h,
+  ColorId color, TextAlign align,
+  int deltax, bool useEllipsis, ColorId shadowColor)
+{
+  string inStr = s;
+
+  // draw multiline string
+  while (font.getStringWidth(inStr) > w && h >= font.getFontHeight() * 2)
+  {
+    // String is too wide.
+    uInt32 i;
+    string leftStr, rightStr;
+    int w2 = 0;
+
+    // SLOW algorithm to find the acceptable length. But it is good enough for now.
+    for(i = 0; i < inStr.size(); ++i)
+    {
+      int charWidth = font.getCharWidth(inStr[i]);
+      if(w2 + charWidth > w)
+        break;
+
+      w2 += charWidth;
+      //str += inStr[i];
+    }
+    wrapString(inStr, i, leftStr, rightStr);
+    drawString(font, leftStr, x, y, w, color, align, deltax, false, shadowColor);
+    h -= font.getFontHeight();
+    y += font.getFontHeight();
+    inStr = rightStr;
+  }
+  drawString(font, inStr, x, y, w, color, align, deltax, useEllipsis, shadowColor);
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void FBSurface::drawString(const GUI::Font& font, const string& s,
                            int x, int y, int w,

src/emucore/FBSurface.hxx

@@ -203,6 +203,26 @@ class FBSurface
     virtual void frameRect(uInt32 x, uInt32 y, uInt32 w, uInt32 h,
                            ColorId color, FrameStyle style = FrameStyle::Solid);
 
+    /**
+      This method should be called to draw the specified string.
+
+      @param font   The font to draw the string with
+      @param s      The string to draw
+      @param x      The x coordinate
+      @param y      The y coordinate
+      @param w      The width of the string area
+      @param h      The height of the string area (for multi line strings)
+      @param color  The color of the text
+      @param align  The alignment of the text in the string width area
+      @param deltax FIXME
+      @param useEllipsis  Whether to use '...' when the string is too long
+    */
+
+    virtual void drawString(
+      const GUI::Font& font, const string& s, int x, int y, int w, int h,
+      ColorId color, TextAlign align = TextAlign::Left,
+      int deltax = 0, bool useEllipsis = true, ColorId shadowColor = kNone);
+
     /**
       This method should be called to draw the specified string.
 
@@ -344,6 +364,15 @@ class FBSurface
     */
     bool checkBounds(const uInt32 x, const uInt32 y) const;
 
+    void wrapString(const string inStr, int pos, string& leftStr, string& rightStr) const;
+
+    /**
+      Check if the given character is a whitespace.
+      @param c      Character to check
+      @return       True if whitespace character
+    */
+    bool isWhiteSpace(const char s) const;
+
   protected:
     static const uInt32* myPalette;
     uInt32* myPixels;

src/gui/EditTextWidget.cxx

@@ -93,7 +93,7 @@ void EditTextWidget::drawWidget(bool hilite)
 
   // Draw the text
   adjustOffset();
-  s.drawString(_font, editString(), _x + 2, _y + 2, getEditRect().w(),
+  s.drawString(_font, editString(), _x + 2, _y + 2, getEditRect().w(), getEditRect().h(),
                _changed && onTop && isEnabled()
                ? kDbgChangedTextColor
                : onTop && isEnabled() ? _textcolor : kColor,

src/gui/EventMappingWidget.cxx

@@ -56,10 +56,11 @@ EventMappingWidget::EventMappingWidget(GuiObject* boss, const GUI::Font& font,
             buttonHeight = font.getLineHeight() + 4;
   const int HBORDER = 8;
   const int VBORDER = 8;
+  const int ACTION_LINES = 2;
   int xpos = HBORDER, ypos = VBORDER;
 
   myActionsList = new StringListWidget(boss, font, xpos, ypos,
-                                       _w - buttonWidth - HBORDER * 2 - 8, _h - 3*lineHeight - VBORDER);
+                                       _w - buttonWidth - HBORDER * 2 - 8, _h - (2 + ACTION_LINES) * lineHeight - VBORDER);
   myActionsList->setTarget(this);
   myActionsList->setEditable(false);
   myActionsList->setList(actions);
@@ -117,7 +118,7 @@ EventMappingWidget::EventMappingWidget(GuiObject* boss, const GUI::Font& font,
                            fontHeight, "Action", TextAlign::Left);
 
   myKeyMapping = new EditTextWidget(boss, font, xpos + t->getWidth() + 8, ypos,
-                                    _w - xpos - t->getWidth() - 8 - HBORDER, lineHeight, "");
+                                    _w - xpos - t->getWidth() - 8 - HBORDER, lineHeight * ACTION_LINES, "");
   myKeyMapping->setEditable(false, true);
   myKeyMapping->clearFlags(Widget::FLAG_RETAIN_FOCUS);
 }