IronPython Tutorial: Advanced (Events, Delegates, WinForms, WPF)

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Advanced IronPython

Events and Delegates

File System Watcher 

def handle(*args): 
    print args
 
from System.IO import *
w = FileSystemWatcher()
w.Path = "."
w.Changed += handle
w.Created += handle
w.Deleted += handle
w.EnableRaisingEvents = True
 
w.Changed -= handle
w.Created -= handle
w.Deleted -= handle


Improved Event Handler 

def handle(w, a): 
    print a.ChangeType, a.FullPath
 
from System.IO import *
w = FileSystemWatcher()
w.Path = "."
 
dir(FileSystemEventArgs)	# FileSystemEventArgs - the information about the event raised
 
w.Changed += handle
w.Created += handle
w.Deleted += handle
w.EnableRaisingEvents = True
 
w.Changed -= handle
w.Created -= handle
w.Deleted -= handle


Defining events in Python

  • pyevent - a module providing Python event support
  • make_event - a function that returns an event tuple containing both the callable object and the object that allows connecting and unconnecting to the event. 
import pyevent
 
# hook - allows a user to hook a function up to the event
# caller - allows the owner of the event to cause the event to be raised
hook,caller = pyevent.make_event()


  • Create a class with event on new instance 
import pyevent
 
class MyClass(object):
    OnNewInstance,_NewInstance= pyevent.make_event()
    def __new__(cls):
        res = object.__new__(object)
        MyClass._NewInstance(res)		# Event caller
 
def NewInst(x): 
    print 'new inst: ', x
 
MyClass.OnNewInstance += NewInst		# Event hook (i.e. handler)
 
a = MyClass()
 
MyClass.OnNewInstance -= NewInst		# Remove event handler


Windows Forms on Python

  • winforms Python module executes some Windows Forms initialization code as part of the import statement. 
import winforms
from System.Windows.Forms import *
from System.Drawing import *
 
def click(*args): print args
 
f = Form()
f.Show()
f.Text = "My First Interactive Application"
f.Click += click
 
# Make some tests
 
f.Click -= click
dir(MouseEventArgs)


  • Improve click event 
import winforms
from System.Windows.Forms import *
from System.Drawing import *
 
def click(f, a):
    l = Label(Text = "Hello")
    l.Location = a.Location
    f.Controls.Add(l)
 
f.Click += click
 
# Make some tests
 
for i in f.Controls: i.Font = Font("Verdana", 15)
for i in f.Controls: i.Text = "Hi"
 
# Make some tests
 
f.Controls.Clear()


  • The some application in one Python module: 
import clr
clr.AddReferenceByPartialName("System.Windows.Forms")
clr.AddReferenceByPartialName("System.Drawing")
from System.Windows.Forms import *
from System.Drawing import *
 
f = Form()
font = Font("Verdana", 15)
f.Text = "My First Interactive Application"
 
def click(f, a):
    l = Label(Text = "Hello")
    l.AutoSize = True
    l.Location = a.Location
    l.Font = font
    f.Controls.Add(l)
 
f.Click += click
 
Application.Run(f)


Windows Presentation Foundation (Avalon) on Python

  • Windows Presentation Foundation Simple Demo 
from avalon import *
 
w = Window()
w.Show()
 
w.Title = "My Avalon Application"
w.SizeToContent = SizeToContent.WidthAndHeight
 
# Make some tests
 
w.Content = TextBlock()
w.Content.Text = "Hello IronPython!"
w.Content.FontSize = 50
w.SizeToContent = SizeToContent.WidthAndHeight
 
# Make some tests
 
w.Content = None


  • WPF Calculator 
from avalon import *
 
w = Window()
w.Show()
w.Content = LoadXaml("calc.xaml")
 
# Make some tests
 
def Walk(tree):
    yield tree
    if hasattr(tree, 'Children'):
        for child in tree.Children:
            for x in Walk(child):
                yield x
    elif hasattr(tree, 'Child'):
        for x in Walk(tree.Child):
            yield x
    elif hasattr(tree, 'Content'):
        for x in Walk(tree.Content):
            yield x
 
for n in Walk(w): print n
 
# Make some tests
 
[ n for n in Walk(w) if isinstance(n, Button) ]
 
# To save the button list object in a variable, use the interpreter's "_" variable, 
# which always holds the last non-None value result printed by the console:
buttons = _
 
# Make some tests
 
for b in buttons: b.FontSize *= 2
for b in buttons: b.Foreground = SolidColorBrush(Colors.Blue)


  • Calculator's XAML from IronPython tutorial 
<Canvas xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
	xmlns:x="http://schemas.microsoft.com/winfx/2006/sparkle">
    <Canvas Name="Layer2">
        <Rectangle Stroke="#FF000000" RadiusX="0" RadiusY="0" StrokeThickness="5" StrokeMiterLimit="2" StrokeEndLineCap="Flat" StrokeStartLineCap="Flat" StrokeLineJoin="Miter" Name="Rectangle1" Width="231" Height="311" Canvas.Left="-1" Canvas.Top="0">
            <Rectangle.Fill>
                <LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5">
                    <LinearGradientBrush.GradientStops>
                        <GradientStop Color="sc#1.000000, 0.157502, 0.408674, 0.808030" Offset="0"/>
                        <GradientStop Color="#FFFFFFFF" Offset="1"/>
                    </LinearGradientBrush.GradientStops>
                </LinearGradientBrush>
            </Rectangle.Fill>
            <Rectangle.RenderTransform>
                <TransformGroup>
                    <TranslateTransform X="-115.5" Y="-155.5"/>
                    <ScaleTransform ScaleX="1" ScaleY="1"/>
                    <SkewTransform AngleX="0" AngleY="0"/>
                    <RotateTransform Angle="0"/>
                    <TranslateTransform X="115.5" Y="155.5"/>
                    <TranslateTransform X="0" Y="0"/>
                </TransformGroup>
            </Rectangle.RenderTransform>
        </Rectangle>
    </Canvas>
    <Canvas Name="Layer1" >
        <TextBox Name="Result" Width="135" Height="33.5533333333333" Canvas.Left="20" Canvas.Top="65"/>
        <RichTextBox Name="Title" IsReadOnly="True" Width="191" Height="48" Canvas.Left="18" Canvas.Top="11" BorderBrush="sc#0.000000, 0.510939, 0.510939, 0.510930" Background="sc#0.000000, 1.000000, 1.000000, 1.000000" Foreground="#FF000000">
            <RichTextBox.RenderTransform>
                <TransformGroup>
                    <TranslateTransform X="-95.499999999999872" Y="-24"/>
                    <ScaleTransform ScaleX="1" ScaleY="1"/>
                    <SkewTransform AngleX="0" AngleY="0"/>
                    <RotateTransform Angle="0"/>
                    <TranslateTransform X="95.499999999999872" Y="24"/>
                    <TranslateTransform X="0" Y="0"/>
                </TransformGroup>
            </RichTextBox.RenderTransform>
            <FlowDocument>
                <Paragraph>
                    <TextBlock FontFamily="Perpetua Titling MT" FontStyle="Italic" FontWeight="700" FontSize="20" Foreground="sc#1.000000, 0.172911, 0.172911, 0.172910">IronCalc</TextBlock>
                    <TextBlock FontFamily="Perpetua Titling MT" FontStyle="Italic" FontWeight="700" FontSize="20" Foreground="sc#1.000000, 0.172911, 0.172911, 0.172910">2007</TextBlock>
                </Paragraph>
            </FlowDocument>
        </RichTextBox>
	<Button Name="One" Content="1" Width="40" Height="40" Canvas.Left="20" Canvas.Top="110"/>
	<Button Name="Nine" Content="9" Width="40" Height="40" Canvas.Left="120" Canvas.Top="210"/>
        <Button Name="Eight" Content="8" Width="40" Height="40" Canvas.Left="70" Canvas.Top="210"/>
        <Button Name="Five" Content="5" Width="40" Height="40" Canvas.Left="70" Canvas.Top="162"/>
        <Button Name="Four" Content="4" Width="40" Height="40" Canvas.Left="20" Canvas.Top="162"/>
        <Button Name="Two" Content="2" Width="40" Height="40" Canvas.Left="70" Canvas.Top="110"/>
        <Button Name="Three" Content="3" Width="40" Height="40" Canvas.Left="120" Canvas.Top="110"/>
        <Button Name="Six" Content="6" Width="40" Height="40" Canvas.Left="120" Canvas.Top="162"/>
        <Button Name="Multiply" Content="*" Width="40" Height="40" Canvas.Left="170" Canvas.Top="162"/>
        <Button Name="Seven" Content="7" Width="40" Height="40" Canvas.Left="20" Canvas.Top="210"/>
        <Button Name="Subtract" Content="-" Width="40" Height="40" Canvas.Left="170" Canvas.Top="210"/>
        <Button Name="Zero" Content="0" Width="40" Height="40" Canvas.Left="20" Canvas.Top="260"/>
        <Button Name="DecimalPoint" Content="." Width="40" Height="40" Canvas.Left="70" Canvas.Top="260"/>
        <Button Name="Equals" Content="=" Width="40" Height="40" Canvas.Left="120" Canvas.Top="260"/>
        <Button Name="Plus" Content="+" Width="40" Height="40" Canvas.Left="170" Canvas.Top="260"/>
        <Button Name="Divide" Content="/" Width="40" Height="40" Canvas.Left="170" Canvas.Top="110"/>
        <Button Name="Clear" Content="C" Width="40" Height="40" Canvas.Left="169" Canvas.Top="62"/>
    </Canvas>
</Canvas>
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