Separator classes (draggable divider between two panes).

Tools/idle/Separator.py

@@ -0,0 +1,89 @@
+from Tkinter import *
+
+class Separator:
+    
+    def __init__(self, master, orient, min=10, thickness=5, bg=None):
+        self.min = max(1, min)
+        self.thickness = max(1, thickness)
+        if orient in ("h", "horizontal"):
+            self.side = "left"
+            self.dim = "width"
+            self.dir = "x"
+            self.cursor = "sb_h_double_arrow"
+    	elif orient in ("v", "vertical"):
+    	    self.side = "top"
+    	    self.dim = "height"
+    	    self.dir = "y"
+            self.cursor = "sb_v_double_arrow"
+    	else:
+    	    raise ValueError, "Separator: orient should be h or v"
+    	self.winfo_dim = "winfo_" + self.dim
+        self.master = master = Frame(master)
+        master.pack(expand=1, fill="both")
+        self.f1 = Frame(master)
+        self.f1.pack(expand=1, fill="both", side=self.side)
+        self.div = Frame(master, cursor=self.cursor)
+        self.div[self.dim] = self.thickness
+        self.div.pack(fill="both", side=self.side)
+        self.f2 = Frame(master)
+        self.f2.pack(expand=1, fill="both", side=self.side)
+        self.div.bind("<ButtonPress-1>", self.divider_press)
+        if bg:
+            ##self.f1["bg"] = bg
+            ##self.f2["bg"] = bg
+            self.div["bg"] = bg
+
+    def parts(self):
+        return self.f1, self.f2
+
+    def divider_press(self, event):
+        self.press_event = event
+        self.f1.pack_propagate(0)
+        self.f2.pack_propagate(0)
+        for f in self.f1, self.f2:
+            for dim in "width", "height":
+                f[dim] = getattr(f, "winfo_"+dim)()
+        self.div.bind("<Motion>", self.div_motion)
+        self.div.bind("<ButtonRelease-1>", self.div_release)
+
+    def div_motion(self, event):
+        delta = getattr(event, self.dir) - getattr(self.press_event, self.dir)
+        if delta:
+            dim1 = getattr(self.f1, self.winfo_dim)()
+            dim2 = getattr(self.f2, self.winfo_dim)()
+            delta = max(delta, self.min-dim1)
+            delta = min(delta, dim2-self.min)
+            dim1 = dim1 + delta
+            dim2 = dim2 - delta
+            self.f1[self.dim] = dim1
+            self.f2[self.dim] = dim2
+
+    def div_release(self, event):
+        self.div_motion(event)
+        self.div.unbind("<Motion>")
+
+class VSeparator(Separator):
+
+    def __init__(self, master, min=10, thickness=5, bg=None):
+        Separator.__init__(self, master, "v", min, thickness, bg)
+
+class HSeparator(Separator):
+
+    def __init__(self, master, min=10, thickness=5, bg=None):
+        Separator.__init__(self, master, "h", min, thickness, bg)
+
+def main():
+    root = Tk()
+    tlist = []
+    outer = HSeparator(root, bg="red")
+    for part in outer.parts():
+        inner = VSeparator(part, bg="blue")
+        for f in inner.parts():
+            t = Text(f, width=40, height=10, borderwidth=0)
+            t.pack(fill="both", expand=1)
+            tlist.append(t)
+    tlist[0].insert("1.0", "Make your own Mondrian!")
+    tlist[1].insert("1.0", "Move the colored dividers...")
+
+if __name__ == '__main__':
+    main()