As has already been shown with some of the other libraries in WindowsMobile In The Hand, the object model is generally designed to follow the Windows Mobile 5.0 APIs. There are a few examples where new functionality is exposed which is not found in the WM 5.0 APIs, some of which was designed specifically to complement Windows Mobile 5.0.
In the case of the Forms assembly, none of the WM5.0 forms are supported, this is because functionality such as CameraCaptureDialog and SelectPicture dialog rely on new functionality in the underlying OS – prior to WM 5.0 each OEM implemented their own camera support.
However in WindowsMobile In The Hand, a few new pieces of forms related functionality are added:-
The MessageBox is designed to provide a softkey-enabled message box for Windows Mobile 5.0 Pocket PCs (although it can also be used on prior versions). When used in a Smartphone project it uses the standard compact framework implementation, on a Windows Mobile 5.0 Pocket PC it produces the following:-
It’s been designed to follow the Smartphone experience so you can provide the same user experience on both platforms. It supports a full range of overrides for the Show method to specify buttons, icon etc. Here the MessageBoxIcon is used to draw a watermark image on the dialog, similar in spirit to the themed icons which are used on the Smartphone equivalent.
MobileDevice provides a few helper methods to reset the device, and get the platform type identifier e.g. PocketPC or Smartphone.
MobileKeys provides a mapping between the device specific key constants (as defined in winuserm.h) and the desktop key codes, so all of the members are of type System.Windows.Forms.Keys.
OpenFileDialog is built specifically for Windows Mobile 5.0 Smartphone and matches the System.Windows.Forms version available in Pocket PC projects. Again if used in a Pocket PC project it utilises the existing implementation in System.Windows.Forms. It will currently raise a NotSupportedException if used on a Smartphone 2003 device.