Feature/tooltips offscreen (#1412)

porcupine/utils.py

@@ -167,7 +167,6 @@ def show(self) -> None:
         if self.got_mouse:
             self.destroy_tipwindow()
             tipwindow = type(self).tipwindow = tkinter.Toplevel()
-            tipwindow.geometry(f"+{self.mousex + 10}+{self.mousey - 10}")
             tipwindow.bind("<Motion>", self.destroy_tipwindow, add=True)
             tipwindow.overrideredirect(True)
 
@@ -176,6 +175,15 @@ def show(self) -> None:
             # the label will have light text on a light background or
             # dark text on a dark background on some systems.
             tkinter.Label(tipwindow, text=self.text, border=3, fg="black", bg="white").pack()
+            tipwindow.update_idletasks()
+            screen_width = tipwindow.winfo_screenwidth()
+            to_end = screen_width - self.mousex
+            tip_width = tipwindow.winfo_width()
+            if to_end >= tip_width / 2:
+                offset = int(tip_width / 2)
+            else:
+                offset = int(tip_width - to_end)
+            tipwindow.geometry(f"+{self.mousex - offset}+{self.mousey - 30}")
 
 
 def set_tooltip(widget: tkinter.Widget, text: str) -> None: