Issue 964437 Make IDLE help window non-modal.

Patch by Guilherme Polo and Roger Serwy.

Lib/idlelib/EditorWindow.py

@@ -63,6 +63,50 @@ def _find_module(fullname, path=None):
             descr = os.path.splitext(filename)[1], None, imp.PY_SOURCE
     return file, filename, descr
 
+
+class HelpDialog(object):
+
+    def __init__(self):
+        self.parent = None      # parent of help window
+        self.dlg = None         # the help window iteself
+
+    def display(self, parent, near=None):
+        """ Display the help dialog.
+
+            parent - parent widget for the help window
+
+            near - a Toplevel widget (e.g. EditorWindow or PyShell)
+                   to use as a reference for placing the help window
+        """
+        if self.dlg is None:
+            self.show_dialog(parent)
+        if near:
+            self.nearwindow(near)
+
+    def show_dialog(self, parent):
+        self.parent = parent
+        fn=os.path.join(os.path.abspath(os.path.dirname(__file__)),'help.txt')
+        self.dlg = dlg = textView.view_file(parent,'Help',fn, modal=False)
+        dlg.bind('<Destroy>', self.destroy, '+')
+
+    def nearwindow(self, near):
+        # Place the help dialog near the window specified by parent.
+        # Note - this may not reposition the window in Metacity
+        #  if "/apps/metacity/general/disable_workarounds" is enabled
+        dlg = self.dlg
+        geom = (near.winfo_rootx() + 10, near.winfo_rooty() + 10)
+        dlg.withdraw()
+        dlg.geometry("=+%d+%d" % geom)
+        dlg.deiconify()
+        dlg.lift()
+
+    def destroy(self, ev=None):
+        self.dlg = None
+        self.parent = None
+
+helpDialog = HelpDialog()  # singleton instance
+
+
 class EditorWindow(object):
     from idlelib.Percolator import Percolator
     from idlelib.ColorDelegator import ColorDelegator
@@ -453,8 +497,11 @@ class EditorWindow(object):
         configDialog.ConfigDialog(self.top,'Settings')
 
     def help_dialog(self, event=None):
-        fn=os.path.join(os.path.abspath(os.path.dirname(__file__)),'help.txt')
-        textView.view_file(self.top,'Help',fn)
+        if self.root:
+            parent = self.root
+        else:
+            parent = self.top
+        helpDialog.display(parent, near=self.top)
 
     def python_docs(self, event=None):
         if sys.platform[:3] == 'win':

Lib/idlelib/textView.py

@@ -9,7 +9,7 @@ class TextViewer(Toplevel):
     """A simple text viewer dialog for IDLE
 
     """
-    def __init__(self, parent, title, text):
+    def __init__(self, parent, title, text, modal=True):
         """Show the given text in a scrollable window with a 'close' button
 
         """
@@ -24,8 +24,6 @@ class TextViewer(Toplevel):
 
         self.CreateWidgets()
         self.title(title)
-        self.transient(parent)
-        self.grab_set()
         self.protocol("WM_DELETE_WINDOW", self.Ok)
         self.parent = parent
         self.textView.focus_set()
@@ -34,6 +32,10 @@ class TextViewer(Toplevel):
         self.bind('<Escape>',self.Ok) #dismiss dialog
         self.textView.insert(0.0, text)
         self.textView.config(state=DISABLED)
+
+        if modal:
+            self.transient(parent)
+            self.grab_set()
             self.wait_window()
 
     def CreateWidgets(self):
@@ -57,10 +59,10 @@ class TextViewer(Toplevel):
         self.destroy()
 
 
-def view_text(parent, title, text):
-    TextViewer(parent, title, text)
+def view_text(parent, title, text, modal=True):
+    return TextViewer(parent, title, text, modal)
 
-def view_file(parent, title, filename, encoding=None):
+def view_file(parent, title, filename, encoding=None, modal=True):
     try:
         with open(filename, 'r', encoding=encoding) as file:
             contents = file.read()
@@ -70,7 +72,7 @@ def view_file(parent, title, filename, encoding=None):
                                message='Unable to load file %r .' % filename,
                                parent=parent)
     else:
-        return view_text(parent, title, contents)
+        return view_text(parent, title, contents, modal)
 
 
 if __name__ == '__main__':
@@ -85,6 +87,10 @@ if __name__ == '__main__':
     btn2 = Button(root, text='view_file',
                   command=lambda:view_file(root, 'view_file', filename))
     btn2.pack(side=LEFT)
+    btn3 = Button(root, text='nonmodal view_text',
+                  command=lambda:view_text(root, 'nonmodal view_text', text,
+                                           modal=False))
+    btn3.pack(side=LEFT)
     close = Button(root, text='Close', command=root.destroy)
     close.pack(side=RIGHT)
     root.mainloop()

Misc/NEWS

@@ -113,6 +113,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #964437 Make IDLE help window non-modal.
+  Patch by Guilherme Polo and Roger Serwy.
+
 - Issue #2945: Make the distutils upload command aware of bdist_rpm products.
 
 - Issue #13933: IDLE auto-complete did not work with some imported