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docs/ai/DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.GraphList/Classes.md

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+---
+source_files:
+  - DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.GraphList/Classes/VirtualToggleButton.cs
+generated_at: "2026-04-17T15:59:03.091690+00:00"
+model: "zai-org/GLM-5-FP8"
+schema_version: 1
+sha256: "b9f03ca53fe295ee"
+---
+
+# VirtualToggleButton Documentation
+
+## 1. Purpose
+
+`VirtualToggleButton` is a static utility class that provides attached dependency properties to imbue any WPF element with toggle button behavior. It allows arbitrary `DependencyObject` instances (specifically those implementing `IInputElement`) to respond to mouse and keyboard input as if they were `ToggleButton` controls, raising the standard `Checked`, `Unchecked`, and `Indeterminate` routed events. This enables toggle-style interactions on elements that cannot inherit from `ToggleButton` directly, such as `TreeViewItem` or custom controls in the `DTS.Viewer.GraphList` module.
+
+---
+
+## 2. Public Interface
+
+### Attached Properties
+
+#### `IsLockedProperty`
+```csharp
+public static readonly DependencyProperty IsLockedProperty
+```
+- **Type:** `Nullable<bool>`
+- **Default Value:** `false`
+- **Metadata Flags:** `BindsTwoWayByDefault | Journal`
+- **Description:** Represents the toggle state of the virtual button. When set to `true`, raises `ToggleButton.CheckedEvent`; when `false`, raises `ToggleButton.UncheckedEvent`; when `null`, raises `ToggleButton.IndeterminateEvent`.
+
+#### `IsThreeStateProperty`
+```csharp
+public static readonly DependencyProperty IsThreeStateProperty
+```
+- **Type:** `bool`
+- **Default Value:** `false`
+- **Description:** Determines whether the control supports three states. When `true`, `IsLocked` can cycle through `null` as a third state.
+
+#### `IsVirtualToggleButtonProperty`
+```csharp
+public static readonly DependencyProperty IsVirtualToggleButtonProperty
+```
+- **Type:** `bool`
+- **Default Value:** `false`
+- **Description:** When set to `true` on an element implementing `IInputElement`, attaches mouse and keyboard handlers to enable toggle button behavior.
+
+### Getter/Setter Methods
+
+```csharp
+public static Nullable<bool> GetIsLocked(DependencyObject d)
+public static void SetIsLocked(DependencyObject d, Nullable<bool> value)
+
+public static bool GetIsThreeState(DependencyObject d)
+public static void SetIsThreeState(DependencyObject d, bool value)
+
+public static bool GetIsVirtualToggleButton(DependencyObject d)
+public static void SetIsVirtualToggleButton(DependencyObject