Added a Spinner control

ScreenUi.cpp

@@ -386,6 +386,43 @@ bool List::handleInputEvent(int x, int y, bool selected, bool cancelled) {
   return captured_;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// Spinner
+////////////////////////////////////////////////////////////////////////////////
+
+Spinner::Spinner(int value, int low, int high, int increment, bool rollover) : Label(NULL) {
+  value_ = value;
+  low_ = low;
+  high_ = high;
+  increment_ = increment;
+  rollover_ = rollover;
+  sprintf(buffer_, "%d", value_);
+  setText(buffer_);
+}
+
+int Spinner::intValue() {
+  return value_;
+}
+
+bool Spinner::handleInputEvent(int x, int y, bool selected, bool cancelled) {
+  if (captured_ && y) {
+    value_ += (y * increment_);
+    if (value_ < low_) {
+      value_ = rollover_ ? high_ : low_;
+    }
+    else if (value_ > high_) {
+      value_ = rollover_ ? low_ : high_;
+    }
+    sprintf(buffer_, "%d", value_);
+    setText(buffer_);
+    repaint();
+  }
+  if (selected) {
+    captured_ = !captured_;
+    repaint();
+  }
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Input
 ////////////////////////////////////////////////////////////////////////////////

ScreenUi.h

@@ -274,6 +274,23 @@ class List : public Label {
     uint8_t selectedIndex_;
 };
 
+// A Component that allows the user to scroll through a range of Integers
+// or floats. 
+class Spinner : public Label {
+  public:
+    Spinner(int value, int low, int high, int increment, bool rollover);
+    int intValue();
+    virtual bool acceptsFocus() { return true; }
+    virtual bool handleInputEvent(int x, int y, bool selected, bool cancelled);
+    #ifdef SCREENUI_DEBUG
+    virtual char *description() { return "Spinner"; }
+    #endif
+  private:
+    char buffer_[10];
+    int value_, low_, high_, increment_;
+    bool rollover_;
+};
+
 // allows text input. Each character can be clicked to scroll through the alphabet.
 class Input : public Label {
   public: