refactor(new_editor/docking): split dock host rendering and hit testing

new_editor/src/Docking/UIEditorDockHostRendering.cpp

@@ -0,0 +1,161 @@
+#include <XCEditor/Docking/UIEditorDockHost.h>
+
+#include <algorithm>
+#include <utility>
+
+namespace XCEngine::UI::Editor::Widgets {
+
+namespace {
+
+using ::XCEngine::UI::UIColor;
+using ::XCEngine::UI::UIDrawList;
+
+bool UsesExternalBodyPresentation(
+    const UIEditorDockHostForegroundOptions& options,
+    std::string_view panelId) {
+    return std::find(
+               options.externalBodyPanelIds.begin(),
+               options.externalBodyPanelIds.end(),
+               panelId) != options.externalBodyPanelIds.end();
+}
+
+UIColor ResolveSplitterColor(
+    const UIEditorDockHostSplitterLayout& splitter,
+    const UIEditorDockHostPalette& palette) {
+    if (splitter.active) {
+        return palette.splitterActiveColor;
+    }
+
+    if (splitter.hovered) {
+        return palette.splitterHoveredColor;
+    }
+
+    return palette.splitterColor;
+}
+
+} // namespace
+
+void AppendUIEditorDockHostBackground(
+    UIDrawList& drawList,
+    const UIEditorDockHostLayout& layout,
+    const UIEditorDockHostPalette& palette,
+    const UIEditorDockHostMetrics& metrics) {
+    for (const UIEditorDockHostTabStackLayout& tabStack : layout.tabStacks) {
+        std::vector<UIEditorTabStripItem> tabItems = {};
+        tabItems.reserve(tabStack.items.size());
+        for (const UIEditorDockHostTabItemLayout& item : tabStack.items) {
+            UIEditorTabStripItem tabItem = {};
+            tabItem.tabId = item.panelId;
+            tabItem.title = item.title;
+            tabItem.closable = item.closable;
+            tabItems.push_back(std::move(tabItem));
+        }
+
+        AppendUIEditorTabStripBackground(
+            drawList,
+            tabStack.tabStripLayout,
+            tabStack.tabStripState,
+            palette.tabStripPalette,
+            metrics.tabStripMetrics);
+    }
+
+    for (const UIEditorDockHostSplitterLayout& splitter : layout.splitters) {
+        drawList.AddFilledRect(
+            splitter.splitterLayout.handleRect,
+            ResolveSplitterColor(splitter, palette),
+            metrics.splitterHandleRounding);
+    }
+}
+
+void AppendUIEditorDockHostForeground(
+    UIDrawList& drawList,
+    const UIEditorDockHostLayout& layout,
+    const UIEditorDockHostForegroundOptions& options,
+    const UIEditorDockHostPalette& palette,
+    const UIEditorDockHostMetrics& metrics) {
+    for (const UIEditorDockHostTabStackLayout& tabStack : layout.tabStacks) {
+        std::vector<UIEditorTabStripItem> tabItems = {};
+        tabItems.reserve(tabStack.items.size());
+        for (const UIEditorDockHostTabItemLayout& item : tabStack.items) {
+            UIEditorTabStripItem tabItem = {};
+            tabItem.tabId = item.panelId;
+            tabItem.title = item.title;
+            tabItem.closable = item.closable;
+            tabItems.push_back(std::move(tabItem));
+        }
+
+        AppendUIEditorTabStripForeground(
+            drawList,
+            tabStack.tabStripLayout,
+            tabItems,
+            tabStack.tabStripState,
+            palette.tabStripPalette,
+            metrics.tabStripMetrics);
+
+        if (UsesExternalBodyPresentation(options, tabStack.selectedPanelId)) {
+            continue;
+        }
+    }
+
+    if (layout.dropPreview.visible) {
+        drawList.AddFilledRect(
+            layout.dropPreview.previewRect,
+            palette.dropPreviewFillColor);
+        drawList.AddRectOutline(
+            layout.dropPreview.previewRect,
+            palette.dropPreviewBorderColor,
+            1.0f);
+    }
+}
+
+void AppendUIEditorDockHostForeground(
+    UIDrawList& drawList,
+    const UIEditorDockHostLayout& layout,
+    const UIEditorDockHostPalette& palette,
+    const UIEditorDockHostMetrics& metrics) {
+    AppendUIEditorDockHostForeground(
+        drawList,
+        layout,
+        UIEditorDockHostForegroundOptions{},
+        palette,
+        metrics);
+}
+
+void AppendUIEditorDockHost(
+    UIDrawList& drawList,
+    const ::XCEngine::UI::UIRect& bounds,
+    const UIEditorPanelRegistry& panelRegistry,
+    const UIEditorWorkspaceModel& workspace,
+    const UIEditorWorkspaceSession& session,
+    const UIEditorDockHostState& state,
+    const UIEditorDockHostForegroundOptions& foregroundOptions,
+    const UIEditorDockHostPalette& palette,
+    const UIEditorDockHostMetrics& metrics) {
+    const UIEditorDockHostLayout layout =
+        BuildUIEditorDockHostLayout(bounds, panelRegistry, workspace, session, state, metrics);
+    AppendUIEditorDockHostBackground(drawList, layout, palette, metrics);
+    AppendUIEditorDockHostForeground(drawList, layout, foregroundOptions, palette, metrics);
+}
+
+void AppendUIEditorDockHost(
+    UIDrawList& drawList,
+    const ::XCEngine::UI::UIRect& bounds,
+    const UIEditorPanelRegistry& panelRegistry,
+    const UIEditorWorkspaceModel& workspace,
+    const UIEditorWorkspaceSession& session,
+    const UIEditorDockHostState& state,
+    const UIEditorDockHostPalette& palette,
+    const UIEditorDockHostMetrics& metrics) {
+    AppendUIEditorDockHost(
+        drawList,
+        bounds,
+        panelRegistry,
+        workspace,
+        session,
+        state,
+        UIEditorDockHostForegroundOptions{},
+        palette,
+        metrics);
+}
+
+} // namespace XCEngine::UI::Editor::Widgets