[IronPython] WPF HBox Layout

WPF HBox Layout

import clr
clr.AddReference("PresentationFramework")
clr.AddReference("PresentationCore");
clr.AddReference('System.Data')
clr.AddReference('System.Windows.Forms')

import System
from System import *
from System.Data import *
from System.Type import GetType
from System.Threading.Tasks import Task
from System.Windows import *
from System.Windows.Controls import *
from System.Windows.Controls.Primitives import *
from System.Windows.Media import *
from System.Windows.Media.Imaging import *
from System.Windows.Media.Effects import *
from System.Windows.Shapes import Rectangle
from System.Windows.Data import Binding
from System.Windows.Ink import Stroke
from System.Windows.Forms import ( FolderBrowserDialog, DialogResult )
from Microsoft.Win32 import ( OpenFileDialog, SaveFileDialog )

import layout
        
class WpfHBox(layout.WpfLayout):
    def __init__(self):
        self.ctrl = Grid()
        self.ctrl.Margin = Thickness(1)
        self.cols = 0
        
    def add_item(self,item,expand=False,group=None,border=False,width=1):
        if expand: length = GridLength(width, GridUnitType.Star)
        else: length = GridLength(width, GridUnitType.Auto)
        self.ctrl.ColumnDefinitions.Add(ColumnDefinition(Width = length))
        Grid.SetColumn(item, self.cols);
        if group:
            gbox = GroupBox()
            gbox.Header = group
            gbox.AddChild(item)
            Grid.SetColumn(gbox, self.cols);
            self.ctrl.Children.Add(gbox)
        else:
            if border:
                rect = Rectangle()
                rect.Stroke = Brushes.Gray
                rect.Fill = Brushes.Transparent
                Grid.SetColumn(rect, self.cols);
                self.ctrl.Children.Add(rect)
            self.ctrl.Children.Add(item)
        self.cols = self.cols + 1
        
    def add_splitter(self,width=1):
        from System.Windows.Controls import GridSplitter
        item = GridSplitter()
        item.HorizontalAlignment = HorizontalAlignment.Center
        item.VerticalAlignment = VerticalAlignment.Stretch
        item.ShowsPreview = True
        item.Width = 5
        length = GridLength(width, GridUnitType.Auto)
        self.ctrl.ColumnDefinitions.Add(ColumnDefinition(Width = length))
        Grid.SetColumn(item, self.cols);
        self.ctrl.Children.Add(item)
        self.cols = self.cols + 1

    def add_spacer(self):
        self.add_item( Label(), expand=True )
        
if __name__ == "__main__":
    import win
    app = win.Win("HSplit Demo",320,240)
    h = WpfHBox()
    h.add_button( "Button1" )
    h.add_spacer()
    h.add_button( "Button2" )
    app.set_content(h.ctrl)
    app.run()