Add ICondition (v9) (#1262)

Dalamud/Plugin/Services/ICondition.cs

@@ -0,0 +1,54 @@
+using Dalamud.Game.ClientState.Conditions;
+
+namespace Dalamud.Plugin.Services;
+
+/// <summary>
+/// Provides access to conditions (generally player state). You can check whether a player is in combat, mounted, etc.
+/// </summary>
+public interface ICondition
+{
+    /// <summary>
+    /// A delegate type used with the <see cref="ConditionChange"/> event.
+    /// </summary>
+    /// <param name="flag">The changed condition.</param>
+    /// <param name="value">The value the condition is set to.</param>
+    public delegate void ConditionChangeDelegate(ConditionFlag flag, bool value);
+    
+    /// <summary>
+    /// Event that gets fired when a condition is set.
+    /// Should only get fired for actual changes, so the previous value will always be !value.
+    /// </summary>
+    public event ConditionChangeDelegate? ConditionChange;
+    
+    /// <summary>
+    /// Gets the current max number of conditions.
+    /// </summary>
+    public int MaxEntries { get; }
+    
+    /// <summary>
+    /// Gets the condition array base pointer.
+    /// </summary>
+    public nint Address { get; }
+    
+    /// <summary>
+    /// Check the value of a specific condition/state flag.
+    /// </summary>
+    /// <param name="flag">The condition flag to check.</param>
+    public bool this[int flag] { get; }
+    
+    /// <inheritdoc cref="this[int]"/>
+    public bool this[ConditionFlag flag] => this[(int)flag];
+
+    /// <summary>
+    /// Check if any condition flags are set.
+    /// </summary>
+    /// <returns>Whether any single flag is set.</returns>
+    public bool Any();
+
+    /// <summary>
+    /// Check if any provided condition flags are set.
+    /// </summary>
+    /// <returns>Whether any single provided flag is set.</returns>
+    /// <param name="flags">The condition flags to check.</param>
+    public bool Any(params ConditionFlag[] flags);
+}