update

client/gui/main_window/MainWindow.h

@@ -3,6 +3,7 @@
 #include "core/workspace/ProjectWorkspace.h"
 #include "main_window/RecentProjectHistory.h"
 
+#include <QElapsedTimer>
 #include <QMainWindow>
 #include <QPointF>
 #include <QFrame>
@@ -120,20 +121,18 @@ private:
     void refreshPreviewPage();
     void refreshEditorPage();
     void applyTimelineFromProject();
+    /// 时间轴当前帧 → 画布：求值并回灌实体/工具/摄像机（不经 TimelineWidget::setCurrentFrame，避免触发 frameScrubbed）
+    void applyTimelineFrameToEditor(int frame);
     void updateTimelineTracks();
     void refreshDopeSheet();
     void setPreviewRequested(bool preview);
     void syncPreviewPlaybackBar();
+    void syncPreviewFloatingChrome();
     void stopEditorPlayback();
     void stopPreviewPlayback();
-    void togglePreviewPlayback();
     void startPreviewPlayback();
     QString effectivePreviewAnimationId() const;
-    void refreshPreviewSchemeCombo();
-    void onPreviewSchemeComboChanged(int idx);
-    void switchPreviewSchemeAdjacent(int delta);
     void requestPreviewSchemeSwitchTo(const QString& id, bool warmupDialog);
-    void updatePreviewEdgeArrowsHover(const QPointF& posInCanvasHost);
 
     QVector<QString> previewAnimationSchemeIdsNonNone() const;
     void syncHotspotEnterPreviewCombo();
@@ -222,6 +221,8 @@ private:
     void updateRightDockColumnMinimumWidthFromContent();
 
     bool m_timelineScrubbing = false;
+    /// 限制 scrub 时全量回灌频率，避免每像素一次 evaluate + 磁盘读图导致时间轴极卡
+    QElapsedTimer m_timelineEditorApplyThrottle;
     bool m_entityDragging = false;
     QTimer* m_propertySyncTimer = nullptr;
 
@@ -240,7 +241,6 @@ private:
     QToolButton* m_btnRailAddHotspot = nullptr;
     QToolButton* m_btnRailMoveHotspot = nullptr;
     QToolButton* m_btnHotspotEnterPreview = nullptr;
-    QToolButton* m_previewBackToCanvasBtn = nullptr;
     int m_previewFrame = 0;
     bool m_previewPlaying = false;
     QTimer* m_previewPlayTimer = nullptr;
@@ -257,11 +257,7 @@ private:
     QPushButton* m_btnDopeDeleteKey = nullptr;
 
     gui::EntityIntroPopup* m_entityIntroPopup = nullptr;
-    QFrame* m_previewPlaybackBar = nullptr;
-    QToolButton* m_previewBtnPlay = nullptr;
-    QComboBox* m_previewSchemeCombo = nullptr;
-    QToolButton* m_previewArrowLeft = nullptr;
-    QToolButton* m_previewArrowRight = nullptr;
+    QToolButton* m_previewBackToStaticBtn = nullptr;
 
     gui::ResourceLibraryDock* m_resourceLibraryDockWidget = nullptr;
     core::library::ResourceLibraryProvider* m_resourceLibraryProvider = nullptr;