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POWERSHELL AND GRAPHICAL USER INTERFACES
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At the end of the exercise, we want to build an application that looks like what s shown in Figure 11.5. It s not as fancy as the calculator that ships with Windows, but it has more functions and, since it s a script, we can add our own custom features when we want to. The basic structure includes a simple File menu with two actions Clear and Exit. Next there is a text box that will hold the value of the most recent calculation. Finally, there are all of the buttons in the calculator. This is where the table lay out manager is important. We don t want to have to lay out each of these buttons by hand. (Even in an interface Figure 11.5 What the PowerShell builder such as Visual Studio, this would be calculator example form looks like. tedious.) The TableLayoutPanel allows us to This example uses the WinForm library to construct an extensible lay out a grid of controls. It has a ColumnCount graphical calculator application. property that allows us to control the number of columns that are used in laying out the buttons. We ll design the application so that by simply changing this value, we can lay out our buttons in two columns, producing a tall, skinny calculator, or set it to 10 columns, producing a shorter, wider layout. The code is shown in listing 11.13.
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Listing 11.13 The PowerShell graphical calculator
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$script:op = '' $script:doClear = $false function clr { $result.text = 0 } [decimal] $script:value = 0
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Set up functions
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scriptblock $handleDigit = { if ($doClear) { $result.text = 0 $script:doClear = $false }
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$key = $this.text $current = $result.Text if ($current -match '^0$|NaN|Infinity') { $result.text = $key } else { if ($key -ne '.' -or $current -notmatch '\.') {
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CHAPTER 1 1
GETTING FANCY .NET AND WINFORMS
$result.Text += $key } } }
Set up Number
scriptblock $handleOp = { $script:value = $result.text $script:op = $this.text $script:doClear = $true }
The key/action
table $keys = ( @{name='7'; action=$handleDigit}, @{name='8'; action=$handleDigit}, @{name='9'; action=$handleDigit}, The Sqr @{name='/'; action = $handleOp}, handler @{name='SQRT'; action = { trap { $resultl.Text = 0; continue } $result.Text = [math]::sqrt([decimal] $result.Text)
} }, @{name='4'; action=$handleDigit}, @{name='5'; action=$handleDigit}, @{name='6'; action=$handleDigit}, @{name='*'; action = $handleOp}, @{name='Clr'; action = $function:clr}, @{name='1'; action=$handleDigit}, @{name='2'; action=$handleDigit}, @{name='3'; action=$handleDigit}, @{name='-'; action = $handleOp}, @{name='1/x'; action = { trap { $resultl.Text = 0; continue } $val = [decimal] $result.Text if ($val -ne 0) { $result.Text = 1.0 / $val } } }, @{name='0'; action=$handleDigit}, @{name='+/-'; action = { trap { $resultl.Text = 0; continue } $result.Text = - ([decimal] $result.Text) } }, @{name='.'; action=$handleDigit}, The = @{name='+'; action = $handleOp}, handler @{name='='; action = {
$key = $this.text
POWERSHELL AND GRAPHICAL USER INTERFACES
trap { message "error: $key" "error: $key"; continue } $operand = [decimal] $result.text $result.text = invoke-expression "`$value $op `$operand" } }, @{name='%'; action = $handleOp}, @{name='sin'; action = { trap { $resultl.Text = 0; continue } $result.Text = [math]::sin([decimal] $result.Text) } }, @{name='cos'; action = { trap { $resultl.Text = 0; continue } $result.Text = [math]::cos([decimal] $result.Text) } }, @{name='tan'; action = { trap { $resultl.Text = 0; continue } $result.Text = [math]::tan([decimal] $result.Text) } }, @{name='int'; action = { trap { $resultl.Text = 0; continue } $result.Text = [int] $result.Text } }, @{name='Sqr'; action = { $result.Text = [double]$result.Text * [double]$result.text } }, @{name='Quit'; action = {$form.Close()}} )
$columns = 5
Number of columns
$form = Form Form @{ Text = "PowerShell Calculator" TopLevel = $true Padding=5 }
$table = form TableLayoutPanel @{ ColumnCount = 1 Dock="fill" } $form.controls.add($table)
Top-level layout
menus $menu = new-menustrip $form { new-menu File { new-menuitem "Clear" { clr } new-separator new-menuitem Quit { $form.Close() }
Define
CHAPTER 1 1
GETTING FANCY .NET AND WINFORMS
} } $table.controls.add($menu)
$script:result = form TextBox @{ Dock="fill" Font = $cfont Text = 0 } $table.Controls.Add($result) $buttons = form TableLayoutPanel @{ ColumnCount = $columns Dock = "fill" }
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