refactor(input): extract the gameplay frame

src/AcDream.App/Input/InputCaptureSources.cs

@@ -0,0 +1,74 @@
+using AcDream.App.UI;
+
+namespace AcDream.App.Input;
+
+internal interface IInputCaptureSource
+{
+    bool WantCaptureMouse { get; }
+    bool WantCaptureKeyboard { get; }
+    bool DevToolsWantCaptureKeyboard { get; }
+}
+
+internal sealed class DevToolsInputCaptureSource
+{
+    private readonly bool _enabled;
+
+    public DevToolsInputCaptureSource(bool enabled) => _enabled = enabled;
+
+    public bool WantCaptureMouse =>
+        _enabled && ImGuiNET.ImGui.GetIO().WantCaptureMouse;
+
+    public bool WantCaptureKeyboard =>
+        _enabled && ImGuiNET.ImGui.GetIO().WantCaptureKeyboard;
+}
+
+internal sealed class RetainedUiInputCaptureSlot
+{
+    public UiRoot? Root { get; set; }
+
+    public bool WantCaptureMouse => Root?.WantsMouse ?? false;
+    public bool WantCaptureKeyboard => Root?.WantsKeyboard ?? false;
+}
+
+internal sealed class CompositeInputCaptureSource : IInputCaptureSource
+{
+    private readonly DevToolsInputCaptureSource _devTools;
+    private readonly RetainedUiInputCaptureSlot _retained;
+
+    public CompositeInputCaptureSource(
+        DevToolsInputCaptureSource devTools,
+        RetainedUiInputCaptureSlot retained)
+    {
+        _devTools = devTools ?? throw new ArgumentNullException(nameof(devTools));
+        _retained = retained ?? throw new ArgumentNullException(nameof(retained));
+    }
+
+    public bool WantCaptureMouse =>
+        _devTools.WantCaptureMouse || _retained.WantCaptureMouse;
+
+    public bool WantCaptureKeyboard =>
+        DevToolsWantCaptureKeyboard || _retained.WantCaptureKeyboard;
+
+    public bool DevToolsWantCaptureKeyboard =>
+        _devTools.WantCaptureKeyboard;
+}
+
+internal sealed class DelegateInputCaptureSource : IInputCaptureSource
+{
+    private readonly Func<bool> _wantCaptureMouse;
+    private readonly Func<bool> _wantCaptureKeyboard;
+
+    public DelegateInputCaptureSource(
+        Func<bool> wantCaptureMouse,
+        Func<bool> wantCaptureKeyboard)
+    {
+        _wantCaptureMouse = wantCaptureMouse
+            ?? throw new ArgumentNullException(nameof(wantCaptureMouse));
+        _wantCaptureKeyboard = wantCaptureKeyboard
+            ?? throw new ArgumentNullException(nameof(wantCaptureKeyboard));
+    }
+
+    public bool WantCaptureMouse => _wantCaptureMouse();
+    public bool WantCaptureKeyboard => _wantCaptureKeyboard();
+    public bool DevToolsWantCaptureKeyboard => false;
+}