widgets: Add a button with a graphical icon

Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>

wasp/widgets.py

@@ -302,6 +302,34 @@ class Checkbox():
             return True
         return False
 
+class GfxButton():
+    """A button with a graphical icon."""
+    def __init__(self, x, y, gfx):
+        self._im = (x, y)
+        self.gfx = gfx
+
+    def draw(self):
+        """Draw the button."""
+        im = self._im
+        wasp.watch.drawable.blit(self.gfx, im[0], im[1])
+
+    def touch(self, event):
+        x = event[1]
+        y = event[2]
+
+        # Adopt a slightly oversized hit box
+        im = self._im
+        gfx = self.gfx
+        x1 = im[0] - 10
+        x2 = x1 + gfx[1] + 20
+        y1 = im[1] - 10
+        y2 = y1 + gfx[2] + 20
+
+        if x >= x1 and x < x2 and y >= y1 and y < y2:
+            return True
+
+        return False
+
 _SLIDER_KNOB_DIAMETER = const(40)
 _SLIDER_KNOB_RADIUS = const(_SLIDER_KNOB_DIAMETER // 2)
 _SLIDER_WIDTH = const(220)