Keeping it Simple: Customizing the WPF Expander Icon

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Before reading this topic, it is important that you are familiar with the concept and usage of markup extensions. This topic does not cover data binding concepts. For a discussion of data binding concepts, see Data Binding Overview. Binding is a markup extension. When you use the binding extension to declare a binding, the declaration consists of a series of clauses following the Binding keyword and separated by commas. The clauses in the binding declaration can be in any order and there are many possible combinations.

When creating binding declaration strings in markup, they must be attached to the specific dependency property of a target object. The following example shows how to bind the TextBox. Text property using the symbol binding in template wpf example extension, specifying the Source and Path properties. You can specify most of the properties of the Binding class this way.

For more information about the binding extension as well as for a list of Binding properties that cannot be set using the binding extension, see the Binding Markup Extension overview. Object element syntax is an alternative to creating the binding declaration. In most cases, there is no particular advantage to using either the markup extension or the object element syntax.

However, in cases which the markup extension does not support symbol binding in template wpf example scenario, such as when your property value is of a non-string type for which no type conversion exists, you need to use the object element syntax.

The example binds the Foreground property by declaring a binding using the extension syntax. The binding declaration for the Text property uses the object element syntax. Another way to specify a binding is to set properties directly on a Binding object in code.

The following example shows how to create a Binding object and specify the properties in code. If the object you are binding is a FrameworkElement or a FrameworkContentElement you can call the SetBinding method on your object directly instead of using BindingOperations.

For an example, see Create a Binding in Code. Use the Path property to specify the source value you want to bind to:. Symbol binding in template wpf example of a property can be specified by a similar syntax as in C. Order sets the binding to the subproperty Order of the object or property ShoppingCart. To bind to an attached property, place parentheses around the attached property. For example, to bind to the attached property DockPanel.

Indexers of a property can be specified within square brackets following the property name where the indexer is applied. Nested indexers are also supported. Inside indexers you can have multiple indexer parameters separated by commas. The type of each parameter can be specified with parentheses. Int32 24]"where sys is mapped to the System namespace. When the source is a collection, this syntax specifies the current item of the default collection view.

Property names and slashes can be combined to traverse properties that are collections. Its current item is an object that contains a ManagerName property.

A default converter is created symbol binding in template wpf example tries to do a type conversion between the binding source value and the binding target value. If a conversion cannot be made, the default converter returns null. If you do not set ConverterCulturethe binding engine uses the Language property of the binding target object.

In XAML, this defaults to "en-US" or inherits the value from the root element or any element of the page, if one has been explicitly set. As long as the binding already symbol binding in template wpf example a data context for instance, the inherited data context coming from a parent elementand whatever item or collection being returned by that context is appropriate for binding without requiring further path modification, a binding declaration can have no clauses at all: The default Mode varies between symbol binding in template wpf example and two-way depending on the dependency property that is being bound.

You can always declare the binding mode explicitly to ensure that your binding has the desired behavior. In general, user-editable control properties, such as TextBox. Valuedefault to two-way bindings, whereas most other properties default to one-way bindings. The default value for most dependency properties is PropertyChangedwhile the TextBox. Text property has a default value of LostFocus. The feedback system for this content will be changing soon. Old comments will not be carried over.

If content within a comment thread is important to you, please save a copy. For more information symbol binding in template wpf example the upcoming change, we invite you to read our blog post. Prerequisites Before reading this topic, it is important that you are familiar with the concept and usage of markup extensions.

Markup Extension Usage Binding is a markup extension. Object Element Syntax Object element syntax is an alternative to creating the binding declaration. The following is an example of both symbol binding in template wpf example object element syntax and the markup extension usage: Creating a Binding in Code Another way to specify a binding is to set properties directly on a Binding object in code. Binding Path Syntax Use the Path property to symbol binding in template wpf example the source value you want to bind to: Commaseparates properties.

Default Behaviors The default behavior is as follows if not specified in the declaration.

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With the new Office theme we introduced a new approach to add icons and icon-like images. We are providing font "glyphs" via the TelerikWebUI font. The glyphs are vector symbols that can be used as information-carrying icons or interaction indicators. As of R1 we recommend using the new RadGlyph class and markup extension to visualize font glyphs. It has a number of advantages which are documented in this article.

This article explains the specifics of this approach, demonstrates usage with examples and provides a reference sheet for the available glyphs. You can find a list with all available glyphs in the reference sheet. The TelerikWebUI font provides over individual glyphs. We have chosen this approach to define the icons in the Office because it provides a number of advantages and benefits.

They are easily colored — since they are text shapes. It is achieved by setting a Foreground color, which allows their usage in scenarios where the background of the control changes between light and dark color in different interaction states — e. They are all contained in the small font file and available for use with the inclusion of the Telerik. Controls assembly and merging the needed resource dictionary for easier referencing.

They are available for use in any of our themes, when the needed resources are included. They are not specific for the Office The recommended size for the TelerikWebUI glyphs is 16 or any multiple of it e. However, they are vector paths and, like any font, would look clean, distinguishable, non-pixelated and beautiful in almost any size, which is their advantage to raster images and icons.

The glyphs are basically text shapes, so they need to be hosted in a control with a text contents. Recommended for this is a TextBlock as it has no special styling. Since this string carries no meaning for the glyph it relates to, we are providing a dictionary with key-value pairs for all available glyphs. This enables the usage of more meaningful references for the needed glyphs.

In order to use the glyph references and the font as StaticResources in a project, you need to include the Telerik. This is extremely useful in scenarios when the background of the control changes in different interaction states see Example 4. Example 5 demonstrates how to change the glyph based on a RadToggleButton being checked or unchecked. If you wish to bind glyphs from your view model, you need to parse the code of the glyph to a single character for it can be displayed as expected.

Otherwise, all characters of the code will be displayed as-is. This can be achieved either by using a converter for your bindings, or by doing the conversion inside your viewmodel. Example 6 demonstrates how this can be done with an IValueConverter but the same approach can be used directly in your viewmodel.

Edit this page Font Glyphs Overview With the new Office theme we introduced a new approach to add icons and icon-like images. The glyphs are vector paths which are easily scalable without loss of quality. There is a wide range of different beautiful built-in glyphs to choose from. The available glyphs are separated in several groups, based on their usage: Is this article helpful? Thank you for your feedback!