From 0ef42a14556447b33f85d67012fed0b0568eb5a0 Mon Sep 17 00:00:00 2001
From: Paddle <PaddleStroke@users.noreply.github.com>
Date: Fri, 17 Mar 2023 14:27:58 +0100
Subject: [PATCH] Sketcher: Add parameter observer for system unit, such that
 the view is updated when user change the unit system through the sizeLabel
 widget.

---
 src/Mod/Sketcher/Gui/EditModeCoinManager.cpp | 14 ++++++++++++++
 src/Mod/Sketcher/Gui/EditModeCoinManager.h   |  1 +
 2 files changed, 15 insertions(+)

diff --git a/src/Mod/Sketcher/Gui/EditModeCoinManager.cpp b/src/Mod/Sketcher/Gui/EditModeCoinManager.cpp
index 60c9917b24..8b2997c522 100644
--- a/src/Mod/Sketcher/Gui/EditModeCoinManager.cpp
+++ b/src/Mod/Sketcher/Gui/EditModeCoinManager.cpp
@@ -149,6 +149,8 @@ void EditModeCoinManager::ParameterObserver::initParameters()
             [this, drawingParameters = Client.drawingParameters](const std::string & param){updateColor(drawingParameters.SelectColor, param);}},
         {"CursorTextColor",
             [this, drawingParameters = Client.drawingParameters](const std::string & param){updateColor(drawingParameters.CursorTextColor, param);}},
+        {"UserSchema",
+            [this](const std::string& param) {updateUnit(param); }},
     };
 
     for( auto & val : str2updatefunction){
@@ -275,6 +277,12 @@ void EditModeCoinManager::ParameterObserver::updateColor(SbColor &sbcolor, const
     Client.updateInventorColors();
 }
 
+void EditModeCoinManager::ParameterObserver::updateUnit(const std::string &parametername)
+{
+    Q_UNUSED(parametername);
+    //Nothing to do because we only need Client.redrawViewProvider(); that is already called in OnChange.
+}
+
 void EditModeCoinManager::ParameterObserver::subscribeToParameters()
 {
     try {
@@ -286,6 +294,9 @@ void EditModeCoinManager::ParameterObserver::subscribeToParameters()
 
         ParameterGrp::handle hGrpskg = App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/Mod/Sketcher");
         hGrpskg->Attach(this);
+
+        ParameterGrp::handle hGrpu = App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/Units");
+        hGrpu->Attach(this);
     }
     catch(const Base::ValueError & e) { // ensure that if parameter strings are not well-formed, the exception is not propagated
         Base::Console().Error("EditModeCoinManager: Malformed parameter string: %s\n", e.what());
@@ -303,6 +314,9 @@ void EditModeCoinManager::ParameterObserver::unsubscribeToParameters()
 
         ParameterGrp::handle hGrpskg = App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/Mod/Sketcher");
         hGrpskg->Detach(this);
+
+        ParameterGrp::handle hGrpu = App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/Units");
+        hGrpu->Detach(this);
     }
     catch(const Base::ValueError & e) {// ensure that if parameter strings are not well-formed, the program is not terminated when calling the noexcept destructor.
         Base::Console().Error("EditModeCoinManager: Malformed parameter string: %s\n", e.what());
diff --git a/src/Mod/Sketcher/Gui/EditModeCoinManager.h b/src/Mod/Sketcher/Gui/EditModeCoinManager.h
index e704e5e91f..085ca3c6df 100644
--- a/src/Mod/Sketcher/Gui/EditModeCoinManager.h
+++ b/src/Mod/Sketcher/Gui/EditModeCoinManager.h
@@ -132,6 +132,7 @@ class SketcherGuiExport EditModeCoinManager
         void updateConstraintPresentationParameters(const std::string & parametername);
         void updateElementSizeParameters(const std::string & parametername);
         void updateColor(SbColor &sbcolor, const std::string &parametername);
+        void updateUnit(const std::string &parametername);
 
         template<OverlayVisibilityParameter visibilityparameter>
         void updateOverlayVisibilityParameter(const std::string & parametername);