Merge pull request #43 from jahr/label-text-align

Added text alignment to the Label widget

gui/widgets/label.py

@@ -3,12 +3,17 @@
 # Released under the MIT License (MIT). See LICENSE.
 # Copyright (c) 2018-2020 Peter Hinch
 
+from micropython import const
 from gui.core.nanogui import DObject
 from gui.core.writer import Writer
 
+ALIGN_LEFT = const(0)
+ALIGN_RIGHT = const(1)
+ALIGN_CENTER = const(2)
+
 # text: str display string int save width
 class Label(DObject):
-    def __init__(self, writer, row, col, text, invert=False, fgcolor=None, bgcolor=None, bdcolor=False):
+    def __init__(self, writer, row, col, text, invert=False, fgcolor=None, bgcolor=None, bdcolor=False, align=ALIGN_LEFT):
         # Determine width of object
         if isinstance(text, int):
             width = text
@@ -17,6 +22,7 @@ class Label(DObject):
             width = writer.stringlen(text)
         height = writer.height
         super().__init__(writer, row, col, height, width, fgcolor, bgcolor, bdcolor)
+        self.align = align
         if text is not None:
             self.value(text, invert)
 
@@ -39,7 +45,17 @@ class Label(DObject):
         super().show()  # Draw or erase border
         wri = self.writer
         dev = self.device
-        Writer.set_textpos(dev, self.row, self.col)
+        if self.align == ALIGN_LEFT:
+            Writer.set_textpos(dev, self.row, self.col)
+        else:
+            txt_width = wri.stringlen(txt)
+            if self.width <= txt_width:
+                Writer.set_textpos(dev, self.row, self.col)
+            else:
+                if self.align == ALIGN_RIGHT:
+                    Writer.set_textpos(dev, self.row, self.col + self.width - txt_width)
+                else:
+                    Writer.set_textpos(dev, self.row, self.col + self.width // 2 - txt_width // 2)
         wri.setcolor(self.fgcolor, self.bgcolor)
         wri.printstring(txt, self.invert)
         wri.setcolor()  # Restore defaults