Let's break down this custom DevExpress ButtonEdit style step by step—here's what it does, how it's configured, and where it makes the most sense to use it:

Full Code Snippet for Context #

<!-- Required DevExpress Editors Namespace -->
xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"

<!-- Custom Style Definition -->
<Style x:Key="ButtonEditInSearchCriteriaStyle" TargetType="dxe:ButtonEdit">
    <Setter Property="Height" Value="25"/>
    <Setter Property="Width" Value="100"/>
    <Setter Property="NullValueButtonPlacement" Value="EditBox"/>
    <Setter Property="AllowDefaultButton" Value="False"/>
</Style>

<!-- Applying the Style to a ButtonEdit Control -->
<dxe:ButtonEdit Grid.Row="1" Grid.Column="3" Style="{StaticResource ButtonEditInSearchCriteriaStyle}"/>

Functionality of the Custom Style #

This style is purpose-built for search/filter scenarios and delivers three key behaviors:

• Enforces a consistent, compact size for the ButtonEdit control
• Removes the default action button that comes with DevExpress ButtonEdit (to avoid cluttering the search UI with unnecessary controls)
• Places the "clear value" button directly inside the edit box (instead of outside) for quick, intuitive emptying of search input

Configuration Logic Breakdown #

Let's walk through each setter to understand why it's included:

• Height="25" & Width="100": Hardcodes a fixed size to ensure all ButtonEdit controls using this style look uniform in a search panel or filter bar. This prevents layout shifts if different inputs have varying content lengths.
• AllowDefaultButton="False": DevExpress ButtonEdit includes a default button (often for dropdowns or custom actions) by default. Disabling this removes that button, turning the control into a simple input field with only the clear-value functionality—perfect for search where you don't need extra actions.
• NullValueButtonPlacement="EditBox": By default, the clear-value button might sit outside the edit box. This setting embeds it inside, saving space in tight layouts and making the clear action more visible and accessible to users.

Ideal Application Scenarios #

This style shines in these use cases:

• Search/Filter Panels: In data grids or query interfaces where you have multiple input fields for filtering, this style ensures all inputs are consistent and focused on search functionality.
• Compact Form Layouts: When you need to fit input controls into a small space (like a toolbar or condensed form), the fixed size and embedded clear button keep things tidy.
• Uniform Input Collections: If your UI uses multiple ButtonEdit controls for related filtering tasks, applying this style across all of them creates a cohesive, professional look.

内容的提问来源于stack exchange，提问作者Tinsley