IXRVisualTransition::SetFrom (Compact 2013)
3/28/2014
This method sets the name of the visual state to transition from.
Syntax
virtual HRESULT STDMETHODCALLTYPE SetFrom(
__in const WCHAR* pFrom
) = 0;
Parameters
- pFrom
[in] Pointer to a string that identifies the name of the visual state to transition from.
Return Value
Returns an HRESULT that indicates success or failure.
Remarks
You can design the appearance of visual states in control templates and in user controls.
Visual states are predefined in the templates of controls that meet the following criteria:
- Controls that derive from the IXRControl class.
- Controls that do not derive from the IXRUserControl class.
Examples of templates that have states already defined are the IXRButton and IXRTextBox controls. You cannot add or remove states to a control template; you can only define the appearance of those states and define the transition behavior between states.
The following list shows examples of visual states of control templates that can be specified in the pFrom parameter. The availability of the following states depends upon the control:
- Checked
- Disabled
- Focused
- Indeterminate
- MouseOver
- Normal
- Pressed
- Unchecked
- Unfocused
If you are working with states that you defined for a user control (a control that derives from the IXRUserControl class), you specify the name of your state in the pFrom parameter.
Specifying a state to transition from, by calling this method, is optional. A visual transition can be restricted to apply to only certain states, or it can be applied any time that the control transitions between states. You restrict when an IXRVisualTransition object is applied to the control by calling IXRVisualTransition::SetTo and IXRVisualTransition::SetFrom.
The following table describes the levels of restriction, from most restrictive to least restrictive.
Type of restriction |
Value to set in SetFrom |
Value to set in SetTo |
|---|---|---|
From a specified state to another specified state |
The Name of an IXRVisualState |
The Name of an IXRVisualState |
From any state to a specified state |
Not set |
The Name of an IXRVisualState |
From a specified state to any state |
The Name of an IXRVisualState |
Not set |
From any state to any other state |
Not set |
Note set |
You can have multiple IXRVisualTransition objects in a collection that belongs to an IXRVisualStateGroup that refer to the same state. However, they will be used in the order that this table specifies.
You can define the To, From, and GeneratedDuration properties of a visual transition in Microsoft Silverlight 3 XAML, in the source XAML that is parsed by your application. For information about the differences between XAML in XAML for Windows Embedded and Silverlight 3, see Differences Between Microsoft Silverlight 3 and XAML for Windows Embedded. For more information about how to define this element in the source XAML for your application, see the VisualTransition.To Property and the VisualTransition Class on MSDN.
Note
The contents of a ControlTemplate defined in Microsoft Silverlight 3 XAML cannot be accessed from C++. Therefore, visual transitions and visual-state groups that were defined in a ControlTemplate in the source XAML for your application cannot be accessed in XAML for Windows Embedded object tree.
.NET Framework Equivalent
System.Windows.VisualTransition.From
Requirements
Header |
XamlRuntime.h |
sysgen |
SYSGEN_XAML_RUNTIME |