GoToEvent button

include/DataManager.hh

@@ -20,6 +20,8 @@ public:
     bool NextEvent();
     /// Move to the previous event.
     bool PrevEvent();
+    /// Jump directly to a specific event number.
+    bool GoToEvent(int evtNum);
     /// Load selected event.
     bool LoadEvent();
 

include/GUIDisplay.hh

@@ -33,6 +33,9 @@ public:
     void OnNextEvent();
     void OnPrevEvent();
 
+    /// Called when "Go To" button fires
+    void OnGoToEvent();
+
     /// Called when "Save" button fires
     void OnSave();
 
@@ -43,6 +46,7 @@ private:
     DataManager dataMgr_;
     MultiView *mv_;
     TGLabel* summaryView_;
+    TGTextEntry* goToEntry_;
     TGTextEntry* filenameEntry_;
 
     int imageScale_ = 0; // for saving

src/DataManager.cpp

@@ -87,12 +87,25 @@ bool DataManager::PrevEvent()
         std::cout << "[DataManager] Already at first event." << std::endl;
         return false;
     }
-    
+
     --currentIndex_;
     currentEvent_ = eventList_.at(currentIndex_);
     return true;
 }
 
+bool DataManager::GoToEvent(int evtNum)
+{
+    if(!rootFile_) return false;
+    auto it = std::find(eventList_.begin(), eventList_.end(), evtNum);
+    if (it == eventList_.end()) {
+        std::cerr << "[DataManager] Event " << evtNum << " not found." << std::endl;
+        return false;
+    }
+    currentIndex_ = std::distance(eventList_.begin(), it);
+    currentEvent_ = evtNum;
+    return true;
+}
+
 bool DataManager::LoadEvent()
 {
     if(!rootFile_){

src/GUIDisplay.cpp

@@ -103,6 +103,17 @@ void GUIDisplay::OnPrevEvent()
   }
 }
 
+void GUIDisplay::OnGoToEvent()
+{
+  TString txt = goToEntry_->GetText();
+  if (txt.IsNull()) return;
+  int evtNum = txt.Atoi();
+  if (dataMgr_.GoToEvent(evtNum)) {
+    LoadEvent();
+    UpdateSummary();
+  }
+}
+
 void GUIDisplay::OnSave()
 {
   std::string filename = filenameEntry_->GetText();
@@ -154,6 +165,18 @@ void GUIDisplay::MakeControlTab()
 
   frm->AddFrame(hf, new TGLayoutHints(kLHintsTop | kLHintsCenterX));
 
+  // go-to event row
+  TGHorizontalFrame* gotoFrame = new TGHorizontalFrame(frm);
+  TGLabel* gotoLabel = new TGLabel(gotoFrame, "Go to event:");
+  gotoFrame->AddFrame(gotoLabel, new TGLayoutHints(kLHintsCenterY, 5, 2, 2, 2));
+  goToEntry_ = new TGTextEntry(gotoFrame, "");
+  goToEntry_->SetWidth(60);
+  gotoFrame->AddFrame(goToEntry_, new TGLayoutHints(kLHintsCenterY, 2, 2, 2, 2));
+  TGTextButton* gotoBtn = new TGTextButton(gotoFrame, "Go");
+  gotoFrame->AddFrame(gotoBtn, new TGLayoutHints(kLHintsCenterY, 2, 5, 2, 2));
+  gotoBtn->Connect("Clicked()", "GUIDisplay", this, "OnGoToEvent()");
+  frm->AddFrame(gotoFrame, new TGLayoutHints(kLHintsTop | kLHintsCenterX));
+
   // event summary
   summaryView_ = new TGLabel(frm, "");
   frm->AddFrame(summaryView_, new TGLayoutHints(kLHintsExpandX | kLHintsTop, 5, 5, 10, 5));