From 966c5dfc0d58a230a4903d06818841c96f652240 Mon Sep 17 00:00:00 2001
From: codereader <greebo@angua.at>
Date: Sat, 22 Oct 2022 10:06:59 +0200
Subject: [PATCH] #6131: TransformPanel activation/deactivation handling

---
 radiant/ui/transform/TransformPanel.cpp | 32 ++++++++++++++++++-------
 radiant/ui/transform/TransformPanel.h   |  7 ++++++
 2 files changed, 31 insertions(+), 8 deletions(-)

diff --git a/radiant/ui/transform/TransformPanel.cpp b/radiant/ui/transform/TransformPanel.cpp
index c1df653c7b..8eebd66f1f 100644
--- a/radiant/ui/transform/TransformPanel.cpp
+++ b/radiant/ui/transform/TransformPanel.cpp
@@ -48,15 +48,36 @@ TransformPanel::TransformPanel(wxWindow* parent) :
 {
 	// Create all the widgets and pack them into the window
 	populateWindow();
+}
 
-    _selectionChanged.disconnect();
+TransformPanel::~TransformPanel()
+{
+    disconnectListeners();
+}
+
+void TransformPanel::onPanelActivated()
+{
+    connectListeners();
+
+    // Update the widget sensitivity
+    update();
+}
+
+void TransformPanel::onPanelDeactivated()
+{
+    disconnectListeners();
+}
 
+void TransformPanel::connectListeners()
+{
     // Register self to the SelSystem to get notified upon selection changes.
     _selectionChanged = GlobalSelectionSystem().signal_selectionChanged().connect(
         [this](const ISelectable&) { update(); });
+}
 
-	// Update the widget sensitivity
-	update();
+void TransformPanel::disconnectListeners()
+{
+    _selectionChanged.disconnect();
 }
 
 void TransformPanel::populateWindow()
@@ -173,11 +194,6 @@ TransformPanel::EntryRow TransformPanel::createEntryRow(
 	return entryRow;
 }
 
-TransformPanel::~TransformPanel()
-{
-	_selectionChanged.disconnect();
-}
-
 void TransformPanel::update()
 {
 	// Check if there is anything selected
diff --git a/radiant/ui/transform/TransformPanel.h b/radiant/ui/transform/TransformPanel.h
index 305f7a9519..d49f8faaf0 100644
--- a/radiant/ui/transform/TransformPanel.h
+++ b/radiant/ui/transform/TransformPanel.h
@@ -50,7 +50,14 @@ class TransformPanel :
 	TransformPanel(wxWindow* parent);
 	~TransformPanel() override;
 
+protected:
+    void onPanelActivated() override;
+    void onPanelDeactivated() override;
+
 private:
+    void connectListeners();
+    void disconnectListeners();
+
 	/** greebo: Updates the sensitivity of the widgets according to
 	 * 			the current selection.
 	 */