New utility: multiple scrolled lists in parallel

Tools/idle/MultiScrolledLists.py

+# One or more ScrolledLists with HSeparators between them.
+# There is a hierarchical relationship between them:
+# the right list displays the substructure of the selected item
+# in the left list.
+
+import string
+from Tkinter import *
+from WindowList import ListedToplevel
+from Separator import HSeparator
+from ScrolledList import ScrolledList
+
+class MultiScrolledLists:
+    
+    def __init__(self, root, nlists=2):
+        assert nlists >= 1
+        self.root = root
+        self.nlists = nlists
+        self.path = []
+        # create top
+        self.top = top = ListedToplevel(root)
+        top.protocol("WM_DELETE_WINDOW", self.close)
+        top.bind("<Escape>", self.close)
+        self.settitle()
+        # create frames and separators in between
+        self.frames = []
+        self.separators = []
+        last = top
+        for i in range(nlists-1):
+            sepa = HSeparator(last)
+            self.separators.append(sepa)
+            frame, last = sepa.parts()
+            self.frames.append(frame)
+        self.frames.append(last)
+        # create labels and lists
+        self.labels = []
+        self.lists = []
+        for i in range(nlists):
+            frame = self.frames[i]
+            label = Label(frame, text=self.subtitle(i),
+                relief="groove", borderwidth=2)
+            label.pack(fill="x")
+            self.labels.append(label)
+            list = ScrolledList(frame, width=self.width(i),
+                height=self.height(i))
+            self.lists.append(list)
+            list.on_select = \
+                lambda index, i=i, self=self: self.on_select(index, i)
+            list.on_double = \
+                lambda index, i=i, self=self: self.on_double(index, i)
+        # fill leftmost list (rest get filled on demand)
+        self.fill(0)
+        # XXX one after_idle isn't enough; two are...
+        top.after_idle(self.call_pack_propagate_1)
+    
+    def call_pack_propagate_1(self):
+        self.top.after_idle(self.call_pack_propagate)
+    
+    def call_pack_propagate(self):
+        for frame in self.frames:
+            frame.pack_propagate(0)
+    
+    def close(self, event=None):
+        self.top.destroy()
+    
+    def settitle(self):
+        short = self.shorttitle()
+        long = self.longtitle()
+        if short and long:
+            title = short + " - " + long
+        elif short:
+            title = short
+        elif long:
+            title = long
+        else:
+            title = "Untitled"
+        icon = short or long or title
+        self.top.wm_title(title)
+        self.top.wm_iconname(icon)
+
+    def longtitle(self):
+        # override this
+        return "Multi Scrolled Lists"
+    
+    def shorttitle(self):
+        # override this
+        return None
+    
+    def width(self, i):
+        # override this
+        return 20
+    
+    def height(self, i):
+        # override this
+        return 10
+    
+    def subtitle(self, i):
+        # override this
+        return "Column %d" % i
+     
+    def fill(self, i):
+        for k in range(i, self.nlists):
+            self.lists[k].clear()
+            self.labels[k].configure(text=self.subtitle(k))
+        list = self.lists[i]
+        l = self.items(i)
+        for s in l:
+            list.append(s)
+        
+    def on_select(self, index, i):
+        item = self.lists[i].get(index)
+        del self.path[i:]
+        self.path.append(item)
+        if i+1 < self.nlists:
+            self.fill(i+1)
+   
+    def items(self, i):
+        # override this
+        l = []
+        for k in range(10):
+            s = str(k)
+            if i > 0:
+                s = self.path[i-1] + "." + s
+            l.append(s)
+        return l
+    
+    def on_double(self, index, i):
+        pass
+
+
+def main():
+    root = Tk()
+    quit = Button(root, text="Exit", command=root.destroy)
+    quit.pack()
+    MultiScrolledLists(root, 4)
+    root.mainloop()
+
+if __name__ == "__main__":
+    main()