Integrate XCUI shell state and runtime frame seams

tests/NewEditor/test_xcui_panel_canvas_host.cpp

@@ -0,0 +1,67 @@
+#include <gtest/gtest.h>
+
+#include "XCUIBackend/NullXCUIPanelCanvasHost.h"
+
+namespace {
+
+using XCEngine::Editor::XCUIBackend::CreateNullXCUIPanelCanvasHost;
+using XCEngine::Editor::XCUIBackend::IXCUIPanelCanvasHost;
+using XCEngine::Editor::XCUIBackend::XCUIPanelCanvasHostBackend;
+using XCEngine::Editor::XCUIBackend::XCUIPanelCanvasHostCapabilities;
+using XCEngine::Editor::XCUIBackend::XCUIPanelCanvasRequest;
+using XCEngine::Editor::XCUIBackend::XCUIPanelCanvasSession;
+
+TEST(NewEditorXCUIPanelCanvasHostTest, NullHostReportsExplicitBackendAndCapabilities) {
+    std::unique_ptr<IXCUIPanelCanvasHost> host = CreateNullXCUIPanelCanvasHost();
+    ASSERT_NE(host, nullptr);
+
+    EXPECT_STREQ(host->GetDebugName(), "NullXCUIPanelCanvasHost");
+    EXPECT_EQ(host->GetBackend(), XCUIPanelCanvasHostBackend::Null);
+
+    const XCUIPanelCanvasHostCapabilities capabilities = host->GetCapabilities();
+    EXPECT_FALSE(capabilities.supportsPointerHitTesting);
+    EXPECT_FALSE(capabilities.supportsHostedSurfaceImages);
+    EXPECT_FALSE(capabilities.supportsPrimitiveOverlays);
+}
+
+TEST(NewEditorXCUIPanelCanvasHostTest, NullHostBeginCanvasReturnsEmptySessionAndDrawCallsAreNoops) {
+    std::unique_ptr<IXCUIPanelCanvasHost> host = CreateNullXCUIPanelCanvasHost();
+    ASSERT_NE(host, nullptr);
+
+    XCUIPanelCanvasRequest request = {};
+    request.childId = "NullCanvas";
+    request.height = 280.0f;
+    request.topInset = 24.0f;
+    request.bordered = true;
+    request.showSurfaceImage = true;
+    request.drawPreviewFrame = true;
+    request.placeholderTitle = "Placeholder";
+    request.badgeTitle = "Badge";
+
+    const XCUIPanelCanvasSession session = host->BeginCanvas(request);
+    EXPECT_FALSE(session.validCanvas);
+    EXPECT_FALSE(session.hovered);
+    EXPECT_FALSE(session.windowFocused);
+    EXPECT_FLOAT_EQ(session.hostRect.width, 0.0f);
+    EXPECT_FLOAT_EQ(session.hostRect.height, 0.0f);
+    EXPECT_FLOAT_EQ(session.canvasRect.width, 0.0f);
+    EXPECT_FLOAT_EQ(session.canvasRect.height, 0.0f);
+
+    host->DrawFilledRect(
+        XCEngine::UI::UIRect(10.0f, 12.0f, 48.0f, 64.0f),
+        XCEngine::UI::UIColor(1.0f, 0.0f, 0.0f, 1.0f),
+        6.0f);
+    host->DrawOutlineRect(
+        XCEngine::UI::UIRect(5.0f, 6.0f, 100.0f, 40.0f),
+        XCEngine::UI::UIColor(0.0f, 1.0f, 0.0f, 1.0f),
+        2.0f,
+        8.0f);
+    host->DrawText(
+        XCEngine::UI::UIPoint(8.0f, 14.0f),
+        "Null host should ignore text draws",
+        XCEngine::UI::UIColor(1.0f, 1.0f, 1.0f, 1.0f),
+        16.0f);
+    host->EndCanvas();
+}
+
+} // namespace