Refactor material inspector state IO

tests/editor/test_viewport_panel_content.cpp

@@ -0,0 +1,103 @@
+#include <gtest/gtest.h>
+
+#include "panels/ViewportPanelContent.h"
+
+#include <imgui.h>
+
+namespace {
+
+class ImGuiContextScope {
+public:
+    ImGuiContextScope() {
+        IMGUI_CHECKVERSION();
+        ImGui::CreateContext();
+    }
+
+    ~ImGuiContextScope() {
+        ImGui::DestroyContext();
+    }
+};
+
+void BeginTestFrame() {
+    ImGuiIO& io = ImGui::GetIO();
+    io.DisplaySize = ImVec2(640.0f, 480.0f);
+    io.DeltaTime = 1.0f / 60.0f;
+    unsigned char* fontPixels = nullptr;
+    int fontWidth = 0;
+    int fontHeight = 0;
+    io.Fonts->GetTexDataAsRGBA32(&fontPixels, &fontWidth, &fontHeight);
+    io.Fonts->SetTexID(static_cast<ImTextureID>(1));
+    ImGui::GetStyle().WindowPadding = ImVec2(0.0f, 0.0f);
+
+    ImGui::NewFrame();
+    ImGui::SetNextWindowPos(ImVec2(0.0f, 0.0f));
+    ImGui::SetNextWindowSize(ImVec2(320.0f, 240.0f));
+    ASSERT_TRUE(ImGui::Begin(
+        "ViewportPanelContentTestWindow",
+        nullptr,
+        ImGuiWindowFlags_NoResize |
+            ImGuiWindowFlags_NoMove |
+            ImGuiWindowFlags_NoTitleBar |
+            ImGuiWindowFlags_NoCollapse |
+            ImGuiWindowFlags_NoSavedSettings));
+}
+
+void EndTestFrame() {
+    ImGui::End();
+    ImGui::EndFrame();
+}
+
+} // namespace
+
+TEST(ViewportPanelContentTest, AllowOverlapDefaultItemClickMissesMiddleClickOnFirstFrame) {
+    ImGuiContextScope contextScope;
+    ImGuiIO& io = ImGui::GetIO();
+
+    BeginTestFrame();
+    EndTestFrame();
+
+    io.MousePos = ImVec2(32.0f, 32.0f);
+    io.MouseDown[ImGuiMouseButton_Middle] = true;
+    BeginTestFrame();
+
+    ImGui::SetCursorScreenPos(ImVec2(16.0f, 16.0f));
+
+    ImGui::SetNextItemAllowOverlap();
+    ImGui::InvisibleButton(
+        "##ViewportOverlapProbe",
+        ImVec2(120.0f, 90.0f),
+        ImGuiButtonFlags_MouseButtonMiddle);
+
+    EXPECT_FALSE(ImGui::IsItemHovered());
+    EXPECT_FALSE(ImGui::IsItemClicked(ImGuiMouseButton_Middle));
+    EXPECT_TRUE(ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenOverlappedByItem));
+
+    EndTestFrame();
+}
+
+TEST(ViewportPanelContentTest, InteractionSurfaceCapturesMiddleClickOnFirstHoveredFrame) {
+    ImGuiContextScope contextScope;
+    ImGuiIO& io = ImGui::GetIO();
+
+    BeginTestFrame();
+    EndTestFrame();
+
+    io.MousePos = ImVec2(32.0f, 32.0f);
+    io.MouseDown[ImGuiMouseButton_Middle] = true;
+    BeginTestFrame();
+
+    ImGui::SetCursorScreenPos(ImVec2(16.0f, 16.0f));
+
+    XCEngine::Editor::ViewportPanelContentResult result = {};
+    XCEngine::Editor::RenderViewportInteractionSurface(
+        result,
+        XCEngine::Editor::EditorViewportKind::Scene,
+        ImVec2(120.0f, 90.0f));
+
+    EXPECT_TRUE(result.hovered);
+    EXPECT_TRUE(result.clickedMiddle);
+    EXPECT_FALSE(result.clickedLeft);
+    EXPECT_FALSE(result.clickedRight);
+
+    EndTestFrame();
+}