Build XCUI splitter foundation and test harness

new_editor/include/XCNewEditor/Widgets/UIEditorPanelChrome.h

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+#pragma once
+
+#include <XCEngine/UI/DrawData.h>
+
+#include <string>
+#include <string_view>
+
+namespace XCEngine {
+namespace UI {
+namespace Widgets {
+
+struct UIEditorPanelChromeState {
+    bool active = false;
+    bool hovered = false;
+};
+
+struct UIEditorPanelChromeText {
+    std::string_view title = {};
+    std::string_view subtitle = {};
+    std::string_view footer = {};
+};
+
+struct UIEditorPanelChromeMetrics {
+    float cornerRounding = 18.0f;
+    float headerHeight = 42.0f;
+    float titleInsetX = 16.0f;
+    float titleInsetY = 12.0f;
+    float subtitleInsetY = 28.0f;
+    float footerInsetX = 16.0f;
+    float footerInsetBottom = 18.0f;
+    float activeBorderThickness = 2.0f;
+    float inactiveBorderThickness = 1.0f;
+};
+
+struct UIEditorPanelChromePalette {
+    UIColor surfaceColor = UIColor(9.0f / 255.0f, 13.0f / 255.0f, 18.0f / 255.0f, 212.0f / 255.0f);
+    UIColor borderColor = UIColor(53.0f / 255.0f, 72.0f / 255.0f, 96.0f / 255.0f, 1.0f);
+    UIColor accentColor = UIColor(84.0f / 255.0f, 176.0f / 255.0f, 244.0f / 255.0f, 1.0f);
+    UIColor hoveredAccentColor = UIColor(1.0f, 206.0f / 255.0f, 112.0f / 255.0f, 1.0f);
+    UIColor headerColor = UIColor(13.0f / 255.0f, 20.0f / 255.0f, 28.0f / 255.0f, 242.0f / 255.0f);
+    UIColor textPrimary = UIColor(232.0f / 255.0f, 238.0f / 255.0f, 246.0f / 255.0f, 1.0f);
+    UIColor textSecondary = UIColor(150.0f / 255.0f, 164.0f / 255.0f, 184.0f / 255.0f, 1.0f);
+    UIColor textMuted = UIColor(108.0f / 255.0f, 123.0f / 255.0f, 145.0f / 255.0f, 1.0f);
+};
+
+inline UIRect BuildUIEditorPanelChromeHeaderRect(
+    const UIRect& panelRect,
+    const UIEditorPanelChromeMetrics& metrics = {}) {
+    return UIRect(
+        panelRect.x,
+        panelRect.y,
+        panelRect.width,
+        metrics.headerHeight);
+}
+
+inline UIColor ResolveUIEditorPanelChromeBorderColor(
+    const UIEditorPanelChromeState& state,
+    const UIEditorPanelChromePalette& palette = {}) {
+    if (state.active) {
+        return palette.accentColor;
+    }
+
+    if (state.hovered) {
+        return palette.hoveredAccentColor;
+    }
+
+    return palette.borderColor;
+}
+
+inline float ResolveUIEditorPanelChromeBorderThickness(
+    const UIEditorPanelChromeState& state,
+    const UIEditorPanelChromeMetrics& metrics = {}) {
+    return state.active
+        ? metrics.activeBorderThickness
+        : metrics.inactiveBorderThickness;
+}
+
+inline void AppendUIEditorPanelChromeBackground(
+    UIDrawList& drawList,
+    const UIRect& panelRect,
+    const UIEditorPanelChromeState& state,
+    const UIEditorPanelChromePalette& palette = {},
+    const UIEditorPanelChromeMetrics& metrics = {}) {
+    drawList.AddFilledRect(panelRect, palette.surfaceColor, metrics.cornerRounding);
+    drawList.AddRectOutline(
+        panelRect,
+        ResolveUIEditorPanelChromeBorderColor(state, palette),
+        ResolveUIEditorPanelChromeBorderThickness(state, metrics),
+        metrics.cornerRounding);
+    drawList.AddFilledRect(
+        BuildUIEditorPanelChromeHeaderRect(panelRect, metrics),
+        palette.headerColor,
+        metrics.cornerRounding);
+}
+
+inline void AppendUIEditorPanelChromeForeground(
+    UIDrawList& drawList,
+    const UIRect& panelRect,
+    const UIEditorPanelChromeText& text,
+    const UIEditorPanelChromePalette& palette = {},
+    const UIEditorPanelChromeMetrics& metrics = {}) {
+    if (!text.title.empty()) {
+        drawList.AddText(
+            UIPoint(panelRect.x + metrics.titleInsetX, panelRect.y + metrics.titleInsetY),
+            std::string(text.title),
+            palette.textPrimary);
+    }
+
+    if (!text.subtitle.empty()) {
+        drawList.AddText(
+            UIPoint(panelRect.x + metrics.titleInsetX, panelRect.y + metrics.subtitleInsetY),
+            std::string(text.subtitle),
+            palette.textSecondary);
+    }
+
+    if (!text.footer.empty()) {
+        drawList.AddText(
+            UIPoint(panelRect.x + metrics.footerInsetX, panelRect.y + panelRect.height - metrics.footerInsetBottom),
+            std::string(text.footer),
+            palette.textMuted);
+    }
+}
+
+} // namespace Widgets
+} // namespace UI
+} // namespace XCEngine