Class StyleInfoBase

Provides a wrapper object for the StyleInfoStore object with type safe access to all properties stored in the style object.

Style objects provide a very user friendly way to modify data. It is very much like in Excel VBA. For example, to change the bold setting for a cell, you simply call grid[5,2].Font.Bold = True.

Inheritance

System.Object

StyleInfoBase

GridStyleInfo

StyleInfoSubObjectBase

Implements

System.IDisposable

IStyleInfo

ISupportInitialize

System.IFormattable

System.Xml.Serialization.IXmlSerializable

Namespace: Syncfusion.UI.Xaml.CellGrid.Styles

Assembly: Syncfusion.SfCellGrid.UWP.dll

Syntax

public abstract class StyleInfoBase : Object, IDisposable, IStyleInfo, ISupportInitialize, IFormattable, IXmlSerializable

Remarks

The StyleInfoBase is a wrapper around the StyleInfoStore. It provides type safe accessor properties to modify data of the underlying data store and can hold temporary information about the style object that does not need to be persisted.

In Essential Grid for the example, the GridStyleInfo class holds extensive identity information about a style object such as cached base styles, row and column index, a reference to the grid model, and more. This is all the information that can be discarded when the style is no longer used (because maybe the cell is not visible anymore). Only the StyleInfoStore part needs to be kept alive.

Style objects only exist temporarily and will be created as a weak reference in a volatile data store. Once Garbage Collection kicks in smart style objects that are not referenced any more will be garbage collected. The volatile data cache can also be cleared manually.

Because Style objects know their identity they can notify their owner of changes or load base style information when the user interacts with the style object. This allows you to make changes to a style object directly, such as Cell.Font.Bold = True;

Style objects support property inheritance from parent styles, e.g. in a grid a cell can inherit properties from a parent row, column, table or a collection of names styles in a base styles map.

Style objects support subobjects. Subobjects can support inheritance (e.g. a Font.Bold can be inherited). Immutable subobjects like BrushInfo don't support inheritance of individual properties.

StyleInfoStore allows you to register any number of properties but keeps the data very memory efficient. Only properties that are actually used for a style object will be allocated for an object. The StyleObjectStore handles the storage of the object. For short integers, enums and Boolean values, the data will be stored in a BitVector32 structure to save even more memory.

Programmers can derive their own style classes from StyleInfoSubObjectBase and add type-safe (and intellisense) supported custom properties to the style class. If you write, for example, your own SpinButton class that needs individual properties, simply add a �CellSpinButtonInfo� class as subobject. If you derive CellSpinButtonInfo from StyleInfoSubObjectBase, your new object will support property inheritance from base styles.

Style objects can be written into a string (see ToString(String, IFormatProvider)) and later be recreated using the ParseString(String) method. When writing the string you have the option to show default values (use the �d� format). Subobjects will be identified with a dot �.�, e.g. �Font.Bold�

Style object support several operations how to combine information from two styles. Style operations include: apply changes, apply initialized properties, override initialized properties, exclude properties. See the ModifyStyle(IStyleInfo, StyleModifyType) method.

Style objects support BeginUpdate, EndUpdate mechanism. This allows users to batch several operations on a style object into one transaction.

Constructors

StyleInfoBase()

Overloaded. Initializes a new style object with no identity and data initialized.

Declaration

protected StyleInfoBase()

StyleInfoBase(StyleInfoIdentityBase, StyleInfoStore)

Initalizes a new StyleInfoBase object and associates it with an existing StyleInfoStore and StyleInfoIdentityBase.

Declaration

protected StyleInfoBase(StyleInfoIdentityBase identity, StyleInfoStore store)

Parameters

Type	Name	Description
StyleInfoIdentityBase	identity	A StyleInfoIdentityBase that holds the identity for this StyleInfoBase.
StyleInfoStore	store	A StyleInfoStore that holds data for this object. All changes in this style object will be saved in the StyleInfoStore object.

StyleInfoBase(StyleInfoIdentityBase, StyleInfoStore, Boolean)

Initalizes a new StyleInfoBase object and associates it with an existing StyleInfoStore and StyleInfoIdentityBase.

Declaration

protected StyleInfoBase(StyleInfoIdentityBase identity, StyleInfoStore store, bool cacheValues)

Parameters

Type	Name	Description
StyleInfoIdentityBase	identity	A StyleInfoIdentityBase that holds the identity for this StyleInfoBase.
StyleInfoStore	store	A StyleInfoStore that holds data for this object. All changes in this style object will be saved in the StyleInfoStore object.
System.Boolean	cacheValues	if set to true the style the resulting value of a property when inherited from a basestyle so that the property does not have to be evaluated multiple times when called repeatedly.

StyleInfoBase(StyleInfoStore)

Initalizes a new StyleInfoBase object and associates it with an existing StyleInfoStore.

Declaration

protected StyleInfoBase(StyleInfoStore store)

Parameters

Type	Name	Description
StyleInfoStore	store	A StyleInfoStore that holds data for this object. All changes in this style object will be saved in the StyleInfoStore object.

Properties

CacheValues

Gets or sets a value indicating whether this instance should cache values for resolved base style properties.

Declaration

public bool CacheValues { get; set; }

Property Value

Type	Description
System.Boolean	true if instance should cache values; otherwise, false.

Identity

Gets / sets the identity information for the current StyleInfoBase.

Declaration

public StyleInfoIdentityBase Identity { get; set; }

Property Value

Type
StyleInfoIdentityBase

IsChanged

Indicates whether any properties for this object have changed since it was applied last time.

Declaration

public bool IsChanged { get; }

Property Value

Type
System.Boolean

IsEmpty

Indicates whether the style is empty.

Declaration

public bool IsEmpty { get; }

Property Value

Type
System.Boolean

Store

The StyleInfoStore object that holds all the data for this style object.

Declaration

public StyleInfoStore Store { get; }

Property Value

Type
StyleInfoStore

Updating

Indicates whether BeginUpdate() was called for this object.

Declaration

public bool Updating { get; }

Property Value

Type
System.Boolean

WeakReferenceChangedListeners

A list of listeners that will be referenced using a WeakReference. The listeners must implement the IStyleChanged interface. When this style object OnStyleChanged(StyleInfoProperty) method is called it will then loop through all objects in this list and call each objects StyleChanged(StyleChangedEventArgs) method.

Declaration

public List<WeakReference> WeakReferenceChangedListeners { get; }

Property Value

Type
System.Collections.Generic.List<System.WeakReference>

Methods

add_Changed(StyleChangedEventHandler)

Declaration

public void add_Changed(StyleChangedEventHandler value)

Parameters

Type	Name	Description
StyleChangedEventHandler	value

add_Changing(StyleChangedEventHandler)

Declaration

public void add_Changing(StyleChangedEventHandler value)

Parameters

Type	Name	Description
StyleChangedEventHandler	value

BeginInit()

Suspends raising Changed events until EndInit() is called and will not change the IsChanged state of this object.

Declaration

public void BeginInit()

BeginUpdate()

Suspends raising Changed events until EndUpdate() is called.

Declaration

public void BeginUpdate()

ClearCache()

Clears the cache.

Declaration

public void ClearCache()

CopyFrom(IStyleInfo)

Copies properties from another style object. This method raises Changing and Changed notifications if the other object differs. (ModifyStyle does not raise these events).

Declaration

public void CopyFrom(IStyleInfo istyle)

Parameters

Type	Name	Description
IStyleInfo	istyle	The style object to be applied on the current object.

CreateSubObjectIdentity(StyleInfoProperty)

Override this method to create a product-specific identity object for a sub object.

Declaration

public virtual StyleInfoSubObjectIdentity CreateSubObjectIdentity(StyleInfoProperty sip)

Parameters

Type	Name	Description
StyleInfoProperty	sip

Returns

Type	Description
StyleInfoSubObjectIdentity	An identity object for a subobject of this style.

Examples

The following code is an example how Essential Grid creates GridStyleInfoSubObjectIdentity:

public override StyleInfoSubObjectIdentity CreateSubObjectIdentity(StyleInfoProperty sip)
{
	return new CachedStyleInfoSubObjectIdentity(this, sip);
}

Dispose()

Releases all resources used by the component.

Declaration

public void Dispose()

Dispose(Boolean)

Declaration

protected virtual void Dispose(bool disposing)

Parameters

Type	Name	Description
System.Boolean	disposing

EndInit()

Resumes raising Changed events and resets the IsChanged state of this object.

Declaration

public void EndInit()

EndUpdate()

Suspends raising Changed events and if changes were made before the EndUpdate() call, it will raise a changed notification immediately.

Declaration

public void EndUpdate()

Equals(Object)

Indicates whether two style objects are equal. Identity is left out with this comparison, only the data (Store) are compared.

Declaration

public override bool Equals(object obj)

Parameters

Type	Name	Description
System.Object	obj	The other style object to compare the current object with.

Returns

Type	Description
System.Boolean	True if both objects have equal data; false otherwise.

EqualsObject(Object, Object)

Compares two objects for equality. Works also with NULL references.

Declaration

protected static bool EqualsObject(object obj1, object obj2)

Parameters

Type	Name	Description
System.Object	obj1	The first object to compare.
System.Object	obj2	The second object to compare.

Returns

Type	Description
System.Boolean	True if both objects are equal.

GetDefaultStyle()

Override this method to return a default style object for your derived class.

Declaration

protected abstract StyleInfoBase GetDefaultStyle()

Returns

Type	Description
StyleInfoBase	A default style object.

Remarks

You should cache the default style object in a static field.

GetDefaultStyleInfoStore(StyleInfoProperty)

Locates the StyleInfoStore in the list of base styles that provides a specific property.

Declaration

protected virtual StyleInfoStore GetDefaultStyleInfoStore(StyleInfoProperty sip)

Parameters

Type	Name	Description
StyleInfoProperty	sip	Identifies the property to look for.

Returns

Type	Description
StyleInfoStore	The style store object that has the specified property.

GetDefaultValue(StyleInfoProperty)

Gets the default value from a base style.

Declaration

protected virtual object GetDefaultValue(StyleInfoProperty sip)

Parameters

Type	Name	Description
StyleInfoProperty	sip	The sip.

Returns

Type
System.Object

GetHashCode()

Returns a hash code which is based on values inside the Store.

Declaration

public override int GetHashCode()

Returns

Type	Description
System.Int32	An integer hash code.

GetSchema()

Not implemented and returns NULL.

Declaration

public XmlSchema GetSchema()

Returns

Type
System.Xml.Schema.XmlSchema

GetShortValue(StyleInfoProperty)

Queries the System.Int16 value for the specified property that has been initialized for the current object or locates it in a base style.

Declaration

public short GetShortValue(StyleInfoProperty sip)

Parameters

Type	Name	Description
StyleInfoProperty	sip	A StyleInfoProperty that identifies the property to operate on.

Returns

Type
System.Int16

GetValue(StyleInfoProperty)

Queries the value for the specified property that has been initialized for the current object or locates it in a base style.

Declaration

public object GetValue(StyleInfoProperty sip)

Parameters

Type	Name	Description
StyleInfoProperty	sip	A StyleInfoProperty that identifies the property to operate on.

Returns

Type
System.Object

HasValue(StyleInfoProperty)

Indicates whether the specified property has been initialized for the current object.

Declaration

public bool HasValue(StyleInfoProperty sip)

Parameters

Type	Name	Description
StyleInfoProperty	sip	A StyleInfoProperty that identifies the property to operate on.

Returns

Type
System.Boolean

IntGetDefaultStyleInfo(StyleInfoProperty)

Locates the base style that has the specified property and returns its instance.

Declaration

protected virtual StyleInfoBase IntGetDefaultStyleInfo(StyleInfoProperty sip)

Parameters

Type	Name	Description
StyleInfoProperty	sip	Identifies the property to look for.

Returns

Type	Description
StyleInfoBase	The style object that has the specified property.

IsSubset(IStyleInfo)

Compares all properties with another style object and indicates whether the current set of initialized properties is a subset of the other style object.

Declaration

public bool IsSubset(IStyleInfo istyle)

Parameters

Type	Name	Description
IStyleInfo	istyle	The other style to compare with.

Returns

Type	Description
System.Boolean	True if this style object is a subset of the other style object.

IsValueModified(StyleInfoProperty)

Indicates whether the specified property has been modified for the current object.

Declaration

protected bool IsValueModified(StyleInfoProperty sip)

Parameters

Type	Name	Description
StyleInfoProperty	sip	A StyleInfoProperty that identifies the property to operate on.

Returns

Type
System.Boolean

MergeStyle(IStyleInfo)

Merges two styles. Resets all properties that differ among the two style objects and keeps only those properties that are equal.

Declaration

public void MergeStyle(IStyleInfo istyle)

Parameters

Type	Name	Description
IStyleInfo	istyle	The other style object this style object should merge with.

ModifyStyle(IStyleInfo, StyleModifyType)

Applies changes to a style object as specified with StyleModifyType.

Declaration

public virtual void ModifyStyle(IStyleInfo istyle, StyleModifyType mt)

Parameters

Type	Name	Description
IStyleInfo	istyle	The style object to be applied on the current object.
StyleModifyType	mt	The actual operation to be performed.

OnStyleChanged(StyleInfoProperty)

Notifies the associated identity object that a specific property was changed and raises a Changed event.

Declaration

protected virtual void OnStyleChanged(StyleInfoProperty sip)

Parameters

Type	Name	Description
StyleInfoProperty	sip	Identifies the property to look for.

OnStyleChanging(StyleInfoProperty)

Notifies the associated identity object that a specific property will be changed and raises a Changing event.

Declaration

protected virtual void OnStyleChanging(StyleInfoProperty sip)

Parameters

Type	Name	Description
StyleInfoProperty	sip	Identifies the property to look for.

ParseString(String)

Parses a given string and applies it's results to affected properties in this style object.

Declaration

public void ParseString(string s)

Parameters

Type	Name	Description
System.String	s	The string to be parsed.

Remarks

ParseString(String) consumes strings previously generated with a ToString(String, IFormatProvider) method call.

ReadXml(XmlReader)

Deserializes the contents of this object from an XML stream.

Declaration

public void ReadXml(XmlReader reader)

Parameters

Type	Name	Description
System.Xml.XmlReader	reader	Represents the XML stream.

remove_Changed(StyleChangedEventHandler)

Declaration

public void remove_Changed(StyleChangedEventHandler value)

Parameters

Type	Name	Description
StyleChangedEventHandler	value

remove_Changing(StyleChangedEventHandler)

Declaration

public void remove_Changing(StyleChangedEventHandler value)

Parameters

Type	Name	Description
StyleChangedEventHandler	value

ResetValue(StyleInfoProperty)

Marks the specified property as uninitialized for the current object.

Declaration

public void ResetValue(StyleInfoProperty sip)

Parameters

Type	Name	Description
StyleInfoProperty	sip	A StyleInfoProperty that identifies the property to operate on.

SetStore(StyleInfoStore)

Sets the StyleInfoStore object that holds all the data for this style object.

Declaration

protected void SetStore(StyleInfoStore store)

Parameters

Type	Name	Description
StyleInfoStore	store

SetValue(StyleInfoProperty, Int16)

Initializes the System.Int16 value for the specified property.

Declaration

public void SetValue(StyleInfoProperty sip, short value)

Parameters

Type	Name	Description
StyleInfoProperty	sip	A StyleInfoProperty that identifies the property to operate on.
System.Int16	value	The value to be saved for the property.

SetValue(StyleInfoProperty, Object)

Overloaded. Initializes the value for the specified property.

Declaration

public void SetValue(StyleInfoProperty sip, object value)

Parameters

Type	Name	Description
StyleInfoProperty	sip	A StyleInfoProperty that identifies the property to operate on.
System.Object	value	The value to be saved for the property.

ToString()

Overloaded. Creates a formatted string for this style object. This string can later be consumed by ParseString(String).

Declaration

public override string ToString()

Returns

Type	Description
System.String	A string with formatted style information.

Remarks

Style objects can be formatted into a string that can be consumed by ParseString(String) to recreate style information.

When writing the string, you have the option to show default values (use the �d� format).

Subobjects will be identified with a period ".", e.g. "Font.Bold".

ToString(String)

Creates a formatted string for this style object. This string can later be consumed by ParseString(String). You can specify "d" as format if you want to write out default values inherited from a base style.

Declaration

public string ToString(string format)

Parameters

Type	Name	Description
System.String	format	Use "d" if default values should be included; "G" and NULL are default.

Returns

Type	Description
System.String	A string with formatted style information.

Remarks

Style objects can be formatted into a string that can be consumed by ParseString(String) to recreate style information.

When writing the string you have the option to show default values (use the "d" format) or not.

Subobjects will be identified with a period ".", e.g. "Font.Bold".

ToString(String, IFormatProvider)

Creates a formatted string for this style object. This string can later be consumed by ParseString(String). You can specify "d" as format if you want to write out default values inherited from a base style.

Declaration

public string ToString(string format, IFormatProvider provider)

Parameters

Type	Name	Description
System.String	format	Use "d" if default values should be included; "G" and NULL are default.
System.IFormatProvider	provider	An System.IFormatProvider to be used for the ToString(String, IFormatProvider) operation. Can be NULL.

Returns

Type	Description
System.String	A string with formatted style information.

Remarks

Style objects can be formatted into a string that can be consumed by ParseString(String) to recreate style information.

When writing the string you have the option to show default values (use the "d" format) or not.

Subobjects will be identified with a period ".", e.g. "Font.Bold".

WriteXml(XmlWriter)

Serializes the contents of this object into an XML stream.

Declaration

public void WriteXml(XmlWriter writer)

Parameters

Type	Name	Description
System.Xml.XmlWriter	writer	Represents the XML stream.

Events

Changed

Occurs when a property in the style object or in a sub object is changed.

Declaration

public event StyleChangedEventHandler Changed

Event Type

Type
StyleChangedEventHandler

Changing

Occurs before a property in the style object or in a sub object is changed.

Declaration

public event StyleChangedEventHandler Changing

Event Type

Type
StyleChangedEventHandler

Implements

System.IDisposable

IStyleInfo

ISupportInitialize

System.IFormattable

System.Xml.Serialization.IXmlSerializable

Extension Methods

DateTimeExtension.ToDateTime(Object)

See Also

StyleInfoIdentityBase

StyleInfoStore