VDialog (Vista TaskDialog for Windows XP)

• Download source code and sample application — 185 KB

VDialog using LockSystem feature.

Sample customized VDialog.

Sample security VDialog.

Expandable VDialog with footer (RightToLeft property set to RightToLeft.Yes and RightToLeftLayout property set to True).

Introduction

Many programmers would like to use Windows Vista TaskDialog on earlier systems like Windows 2000/XP. Unfortunately this is not possible.

There are some TaskDialog implementations on the Internet, but none of them is written in VB.NET. I decided to write my own version of a TaskDialog-like form with all the functionality of Vista TaskDialog. It is almost fully compatible with the MessageBox class. And there are some features of Vista TaskDialog implemented (the rest of them will be implemented later). Some features, which are not implemented, can be emulated using custom controls (like radio buttons or progress bar — see the first screenshot above).

Using the code

The VDialog class is compatible with the MessageBox class so it can be used in the same way, e.g.:

VDialog.Show(Me, "Text", "Caption", MessageBoxButtons.YesNo, MessageBoxIcon.Error)

To customize the appearance of VDialog one must create VDialog object, set its properties and then invoke the Show() method, e.g.:

Dim vd As New VDialog()
With vd
    .WindowTitle = "Windows Vista"
    .Owner = Me
    .MainInstruction = "You must click OK button to continue"
    .Buttons = New VDialogButton() _
              { New VDialogButton(VDialogResult.OK), _
                New VDialogButton(VDialogResult.Continue) }
    .MainIcon = VDialogIcon.SecurityShieldBlue
    .DefaultButton = VDialogDefaultButton.None
    .Content = "If you don't know what to do, click Cancel button."
    .LockSystem = True
    .CustomControl = New MyCustomControl()
    .Show()
End With

Features

Almost full compatibility with the MessageBox class

Existing code can be easily changed to one which uses the VDialog class instead of the MessageBox class by changing the MessageBox.Show(…) invocation to the VDialog.Show(…) invocation.

Supported methods:

Show(String) As DialogResult
Show(String, String) As DialogResult
Show(String, String, MessageBoxButtons) As DialogResult
Show(String, String, MessageBoxButtons, MessageBoxIcon) As DialogResult
Show(String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton) As DialogResult
Show(String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions) As DialogResult
Show(IWin32Window, String) As DialogResult
Show(IWin32Window, String, String) As DialogResult
Show(IWin32Window, String, String, MessageBoxButtons) As DialogResult
Show(IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon) As DialogResult
Show(IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton) As DialogResult

Advanced usage

The VDialog class can also be used in other way. One can create VDialog object and set its properties, such as:

• Owner — determines the parent of the VDialog message window.
• Content, ContentLinks, WindowTitle and MainInstruction — determines the content of the dialog window which will be displayed, the caption of the window, and the main instruction.
• Buttons — determines what buttons will be displayed on the VDialog message window. VDialogButton is a class containing UseCustomText, Text and VDialogResult properties, and also a Click event which is raised when the associated button is clicked (but before closing the window).
• MainIcon, CustomMainIcon — the image show at the left side of the window (or right side when right-to-left layout is used).
• DefaultButton — determines which button is initially focused.
• RightToLeft and RightToLeftLayout — determines whether the layout of the window should be "mirrored".
• Result — indicates the return value of the VDialog window.
• LockSystem — enables the UAC-like system locking behavior.
• CustomControl — provides an easy way to extend the VDialog window. It can be used to emulate the features of TaskDialog which are not supported yet.
• VerificationText and VerificationFlagChecked — manages the check box shown at the left side of the buttons. It can be used for "Don't show it again"-like check boxes.
• Sound — played when the dialog window is shown.
• FooterText, FooterLinks, FooterIcon and CustomFooterIcon — determines the text and the image of the footer.
• ExpandedInformation, ExpandedInformationLinks, ExpandFooterArea, ExpandedByDefault, ExpandedControlText and CollapsedControlText — determines the look and behavior of the expando control and label with extra information.

Localization support

The captions of the standard buttons (e.g. OK, Yes, Ignore, etc…) can be easily localized by translating the resources file. The English versions of these captions are contained in the Resoureces.resx file.

Images

The VDialogIcon class contains twelve read-only fields which provide access to Vista-like images, such as:

• — Information
• — Question
• — Warning
• — Error
• — SecurityShield, SecurityShieldBlue, SecurityShieldGray
• — SecuritySuccess
• — SecurityQuestion
• — SecurityWarning
• — SecurityError
• There is also the None field.

Assigning the VDialogIcon.Security* field (except the SecurityShield) to the MainIcon property of the VDialog class causes that the appropriate gradient is drawn beneath the icon and main instruction.

Sounds

The VDialogSound class provides access to six sounds (Default, Information, Question, Warning, Error, Security) that can be assigned to the Sound property of the VDialog class. Custom sound can be provided by object which implements the ISound interface.

Command links

There is and animated CommandLink control which can be used to build a custom controls and then embed it in the VDialog.

License

The code is licensed under the Common Public License Version 1.0 (CPL).

TODO

Although the VDialog class provides many useful properties, there are some features of TaskDialog that my VDialog does not implement yet, such as:

• Full support for CommandLinks
• RadioButtons
• ProgressBar
• Timer

These features can only be obtained by using custom controls.

History

• 1.4 (02.01.2008)
  • Added support for Links.
  • Fixed some bugs.
• 1.3 (12.12.2007)
  • Added partial support for CommandLinks.
  • Added support for elevation (shield) icon.
  • Fixed some bugs.
• 1.2 (05.12.2007)
  • Added XML documentation.
  • Added Close method to the VDialog class.
  • Added license.
  • Minor bugs fixed.
• 1.1 (18.11.2007)
  • Renamed some properties so they are compliant with TaskDialog.
  • Added sounds support.
  • Added footer support.
  • Added expandable information support.
  • Added support for security dialogs.
  • Minor bugs fixed.
• 1.0
  • 11.11.2007 — Added Vista-like images.
  • 07.11.2007 — First version.