Added (fixed) tickmark intervals to SliderWidget

src/emucore/FrameBuffer.cxx

@@ -1008,11 +1008,11 @@ void FrameBuffer::VideoModeList::setZoom(uInt32 zoom)
     kScrollColor      Normal scrollbar color
     kScrollColorHi    Highlighted scrollbar color
     *** Slider colors ***
-    kSliderColor,
-    kSliderColorHi
-    kSliderBGColor
-    kSliderBGColorHi
-    kSliderBGColorLo,
+    kSliderColor          Enabled slider
+    kSliderColorHi        Focussed slider
+    kSliderBGColor        Enabled slider background
+    kSliderBGColorHi      Focussed slider background
+    kSliderBGColorLo      Disabled slider background
     *** Debugger colors ***
     kDbgChangedColor      Background color for changed cells
     kDbgChangedTextColor  Text color for changed cells
@@ -1055,7 +1055,7 @@ uInt32 FrameBuffer::ourGUIColors[3][kNumColors-256] = {
     0xe1e1e1, 0xe5f1fb, 0x808080, 0x0078d7, 0x000000, 0x000000, // buttons
     0x333333,                                                   // checkbox
     0xc0c0c0, 0x808080,                                         // scrollbar
-    0x333333, 0x0078d7, 0xc0c0c0, 0x808080, 0xe1e1e1,           // slider
+    0x333333, 0x0078d7, 0xc0c0c0, 0xffffff, 0xc0c0c0,           // slider 0xBDDEF9| 0xe1e1e1 | 0xffffff
     0xffc0c0, 0x000000, 0xe00000, 0xc00000,                     // debugger
     0xffffff, 0x333333, 0xf0f0f0, 0x808080, 0xc0c0c0            // other
   }

src/gui/DeveloperDialog.cxx

@@ -205,6 +205,7 @@ void DeveloperDialog::addVideoTab(const GUI::Font& font)
                                          myTVJitterWidget->getRight() + fontWidth * 3, ypos - 1,
                                          "Recovery ", 0, kTVJitterChanged);
   myTVJitterRecWidget->setMinValue(1); myTVJitterRecWidget->setMaxValue(20);
+  myTVJitterRecWidget->setTickmarkInterval(5);
   wid.push_back(myTVJitterRecWidget);
   myTVJitterRecLabelWidget = new StaticTextWidget(myTab, font,
                                                   myTVJitterRecWidget->getRight() + 4,

src/gui/VideoDialog.cxx

@@ -94,6 +94,7 @@ VideoDialog::VideoDialog(OSystem& osystem, DialogContainer& parent,
   SliderWidget* s = new SliderWidget(myTab, font, xpos, ypos - 1, swidth, lineHeight,
                                      "TIA zoom", lwidth, 0, fontWidth * 4, "%");
   s->setMinValue(200); s->setMaxValue(500);
+  s->setTickmarkInterval(3); // just for testing now; TODO: remove or redefine
   wid.push_back(s);
   ypos += lineHeight + VGAP;
 

src/gui/Widget.cxx

@@ -638,7 +638,8 @@ SliderWidget::SliderWidget(GuiObject* boss, const GUI::Font& font,
     _valueLabelGap(valueLabelGap),
     _valueLabelWidth(valueLabelWidth),
     _valueLabel(""),
-    _valueUnit(valueUnit)
+    _valueUnit(valueUnit),
+    _numIntervals(0)
 {
   _flags = WIDGET_ENABLED | WIDGET_TRACK_MOUSE;
   _bgcolor = kDlgColor;
@@ -721,6 +722,13 @@ void SliderWidget::setValueUnit(const string& valueUnit)
   setDirty();
 }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void SliderWidget::setTickmarkInterval(int numIntervals)
+{
+  _numIntervals = numIntervals;
+  setDirty();
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void SliderWidget::handleMouseMoved(int x, int y)
 {
@@ -816,6 +824,30 @@ void SliderWidget::drawWidget(bool hilite)
   // Draw the 'bar'
   s.fillRect(x, y, p, h,
              !isEnabled() ? kColor : hilite ? kSliderColorHi : kSliderColor);
+
+  // Draw the 'tickmarks'
+  for(int i = 1; i < _numIntervals; ++i)
+  {
+    int xt = x + (_w - _labelWidth - _valueLabelGap - _valueLabelWidth) * i / _numIntervals - 1;
+    uInt32 color;
+
+    if(isEnabled())
+    {
+      if(xt > x + p)
+        color = hilite ? kSliderColorHi : kSliderColor;
+      else
+        color = hilite ? kSliderBGColorHi : kSliderBGColor;
+    }
+    else
+    {
+      if(xt > x + p)
+        color = kColor;
+      else
+        color = kSliderBGColorLo;
+    }
+    s.vLine(xt, y + h / 2, y + h - 1, color);
+  }
+
   // Draw the 'handle'
   s.fillRect(x + p, y - 2, 2, h + 4,
              !isEnabled() ? kColor : hilite ? kSliderColorHi : kSliderColor);

src/gui/Widget.hxx

@@ -328,6 +328,8 @@ class SliderWidget : public ButtonWidget
     const string& getValueLabel() const { return _valueLabel; }
     void setValueUnit(const string& valueUnit);
 
+    void setTickmarkInterval(int numIntervals);
+
   protected:
     void handleMouseMoved(int x, int y) override;
     void handleMouseDown(int x, int y, MouseButton b, int clickCount) override;
@@ -349,6 +351,7 @@ class SliderWidget : public ButtonWidget
     string _valueUnit;
     int    _valueLabelWidth;
     int    _valueLabelGap;
+    int    _numIntervals;
 
   private:
     // Following constructors and assignment operators not supported