From 23440b0dd71b7b6a0ce33ad5196bd1b348db26bd Mon Sep 17 00:00:00 2001
From: vsv <vsv@opencascade.com>
Date: Wed, 4 Jul 2018 20:54:27 +0300
Subject: [PATCH] Provide completion on editing

---
 src/ModuleBase/ModuleBase_ParamSpinBox.cpp | 22 ++++++++++++++++------
 src/ModuleBase/ModuleBase_ParamSpinBox.h   |  2 +-
 2 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/src/ModuleBase/ModuleBase_ParamSpinBox.cpp b/src/ModuleBase/ModuleBase_ParamSpinBox.cpp
index d0f527331..97b8e3f22 100644
--- a/src/ModuleBase/ModuleBase_ParamSpinBox.cpp
+++ b/src/ModuleBase/ModuleBase_ParamSpinBox.cpp
@@ -209,14 +209,21 @@ bool ModuleBase_ParamSpinBox::hasVariable(const QString& theText) const
   return !isDouble;
 }
 
-void ModuleBase_ParamSpinBox::showCompletion()
+void ModuleBase_ParamSpinBox::showCompletion(bool checkPrefix)
 {
   myCompletePos = lineEdit()->cursorPosition();
   int aStart, aEnd;
   QString aPrefix;
   aPrefix = getPrefix(aStart, aEnd);
-  myCompleter->setCompletionPrefix(aPrefix);
-  myCompleter->complete();
+  if (checkPrefix) {
+    if (aPrefix.length() > 0) {
+      myCompleter->setCompletionPrefix(aPrefix);
+      myCompleter->complete();
+    }
+  } else {
+    myCompleter->setCompletionPrefix(aPrefix);
+    myCompleter->complete();
+  }
 }
 
 void ModuleBase_ParamSpinBox::keyReleaseEvent(QKeyEvent* e)
@@ -225,7 +232,10 @@ void ModuleBase_ParamSpinBox::keyReleaseEvent(QKeyEvent* e)
 
   switch (e->key()) {
   case Qt::Key_Backspace:
-    showCompletion();
+    if (myCompleter->popup()->isVisible()) {
+      myCompleter->popup()->hide();
+    }
+    showCompletion(true);
     break;
   case Qt::Key_Return:
   case Qt::Key_Enter:
@@ -237,14 +247,14 @@ void ModuleBase_ParamSpinBox::keyReleaseEvent(QKeyEvent* e)
     break;
   case Qt::Key_Space:
     if (e->modifiers() & Qt::ControlModifier) {
-      showCompletion();
+      showCompletion(false);
     }
     break;  default:
     aText = e->text();
     if (aText.length() == 1) {
       QChar aChar = aText.at(0);
       if (isVariableSymbol(aChar)) {
-        showCompletion();
+        showCompletion(true);
       }
     }
   }
diff --git a/src/ModuleBase/ModuleBase_ParamSpinBox.h b/src/ModuleBase/ModuleBase_ParamSpinBox.h
index 489d082fd..7e33da9c6 100644
--- a/src/ModuleBase/ModuleBase_ParamSpinBox.h
+++ b/src/ModuleBase/ModuleBase_ParamSpinBox.h
@@ -142,7 +142,7 @@ private slots:
 
 private:
   QString getPrefix(int& theStart, int& theEnd) const;
-  void showCompletion();
+  void showCompletion(bool checkPrefix);
 
   bool myIsEquation;
   bool myAcceptVariables;
-- 
2.39.2