Question

In this part of the IronPython Mono Winforms tutorial, we will continue introducing basic Mono Winforms controls.

RadioButton

The RadioButton control enables the user to select a single option from a group of choices when paired with other RadioButton controls. The GroupBox control is used to pair radio buttons together.

radiobutton.py

#!/usr/bin/ipy

import clr
clr.AddReference("System.Windows.Forms")
clr.AddReference("System.Drawing")

from System.Windows.Forms import Application, Form, StatusBar
from System.Windows.Forms import RadioButton, GroupBox
from System.Drawing import Size, Point


class IForm(Form):

  def __init__(self):

    self.Text = "RadioButton"
    self.Size = Size(240, 240)

    gb = GroupBox()
    gb.Text = "Sex"
    gb.Size = Size(120, 110)
    gb.Location = Point(20, 20)
    gb.Parent = self

    male = RadioButton()
    male.Text = "Male"
    male.Parent = gb
    male.Location = Point(10, 30)
    male.CheckedChanged += self.OnChanged


    female = RadioButton()
    female.Text = "Female"
    female.Parent = gb
    female.Location = Point(10, 60)
    female.CheckedChanged += self.OnChanged

    self.statusbar = StatusBar()
    self.statusbar.Parent = self

    self.CenterToScreen()

  def OnChanged(self, sender, event):
    if sender.Checked:
      self.statusbar.Text = sender.Text
  
  
Application.Run(IForm())

In our example, we show two radio buttons in a group box. Only one option is selectable at a time. The option value is shown in the statusbar.

gb = GroupBox()
gb.Text = "Sex"

GroupBox control is used to group radio buttons together. This way we can choose only one radio button control at a time.

male = RadioButton()
male.Text = "Male"
male.Parent = gb

RadioButton control with text "Male" is created. Its parent is the group box control.

def OnChanged(self, sender, event):
  if sender.Checked:
    self.statusbar.Text = sender.Text

The OnChanged() method sets the text of the currently selected radio button to the statusbar control.

Figure: RadioButton

MonthCalendar

In the next example, we will show a MonthCalendar control. The MonthCalendar control allows the user to select a date using a visual display.

monthcalendar.py

#!/usr/bin/ipy

import clr
clr.AddReference("System.Windows.Forms")
clr.AddReference("System.Drawing")

from System.Windows.Forms import Application, Form
from System.Windows.Forms import Label, MonthCalendar
from System.Drawing import Size, Point


class IForm(Form):

  def __init__(self):
    self.Text = 'MonthCalendar'
    self.Size = Size(240, 240)
    
    calendar = MonthCalendar()
    calendar.Parent = self
    calendar.Location = Point(20, 20)
    calendar.DateSelected += self.OnSelected

    self.date = Label()
    self.date.Location = Point(30, 180)
    self.date.Parent = self
    dt = calendar.SelectionStart
    self.date.Text = str(dt.Month) + "/" + str(dt.Day) + "/" + str(dt.Year)
    
    self.CenterToScreen()
  

  def OnSelected(self, sender, event): 
    dt = sender.SelectionStart
    self.date.Text = str(dt.Month) + "/" + str(dt.Day) + "/" + str(dt.Year)
  

Application.Run(IForm())

In the example, we show a MonthCalendar and a Label .

calendar = MonthCalendar()
...
self.date = Label()

We have two controls. A MonthCalendar and a Label . The latter shows the currently selected date.

def OnSelected(self, sender, event): 
  dt = sender.SelectionStart
  self.date.Text = str(dt.Month) + "/" + str(dt.Day) + "/" + str(dt.Year)

When we select a date from the MonthCalendar , the OnSelected() method is called. The SelectionStart property gets the start date of the selected range of dates.

Figure: MonthCalendar

TextBox

The TextBox control is used to display or accept some text. The text can be single or multiline. This control is also capable of password masking.

textbox.py

#!/usr/bin/ipy

import clr
clr.AddReference("System.Windows.Forms")
clr.AddReference("System.Drawing")

from System.Windows.Forms import Application, Form
from System.Windows.Forms import Label, TextBox
from System.Drawing import Size, Point



class IForm(Form):

  def __init__(self):

    self.Text = 'TextBox'

    self.text = Label()
    self.text.Parent = self
    self.text.Text = "..."
    self.text.AutoSize = True
    self.text.Location = Point(60, 40)

    tbox = TextBox()
    tbox.Parent = self
    tbox.Location = Point(60, 100)
    tbox.KeyUp += self.OnKeyUp

    self.Size = Size(250, 200)
    self.CenterToScreen()
  

  def OnKeyUp(self, sender, event): 
    self.text.Text = sender.Text
  

Application.Run(IForm())

This example shows a text box and a label. The text that we key in the text box is displayed immediately in the label control.

self.text = Label()
...
self.text.AutoSize = True

The Label control is created. The AutoSize property ensures that the Label grows to show the text.

tbox = TextBox()
...
tbox.KeyUp += self.OnKeyUp

We plug in the KeyUp event into the TextBox control. When we release the key, OnKeyUp() method is called.

def OnKeyUp(self, sender, event): 
  self.text.Text = sender.Text

In the OnKeyUp() method we update the label control with the text from the text box control.

Figure: TextBox

PictureBox

The PictureBox control is used for displaying a picture on the form.

picturebox.py

#!/usr/bin/ipy

import sys
import clr
clr.AddReference("System.Windows.Forms")
clr.AddReference("System.Drawing")

from System.Windows.Forms import Application, Form, PictureBox
from System.Drawing import Size, Point, Bitmap


class IForm(Form):

  def __init__(self):
    self.Text = 'PictureBox'
    
    try:
      castle = Bitmap('redrock.png') 
    except Exception, e:
      print 'Cannot read image file'
      print e.msg
      sys.exit(1)
 
    pb = PictureBox()
    pb.Parent = self
    pb.Size = Size(castle.Width, castle.Height)
    pb.Location = Point(2, 2)
    pb.Image = castle

    self.Size = Size(castle.Width, castle.Height)
    self.CenterToScreen()


Application.Run(IForm())

The example shows a png image on the form.

try:
  castle = Bitmap('redrock.png') 
except Exception, e:
  print 'Cannot read image file'
  print e.msg
  sys.exit(1)    

We get a bitmap from the current working directory.

pb = PictureBox()   

The PictureBox control is created.

pb.Image = castle  

The Image property points to the bitmap, we have created.

self.Size = Size(castle.Width, castle.Height)

The size of the form is equal to the size of the bitmap.

Figure: PictureBox

We have finished chapter of the Mono Winforms programming tutorial, dedicated to basic controls.