Delay the automatic completion.

src/plugins/cpptools/cppcodecompletion.cpp

@@ -658,7 +658,7 @@ bool CppCodeCompletion::triggersCompletion(TextEditor::ITextEditable *editor)
         QChar characterUnderCursor = editor->characterAt(pos);
         if (!characterUnderCursor.isLetterOrNumber()) {
             const int startOfName = findStartOfName(pos);
-            if (pos - startOfName == 3) {
+            if (pos - startOfName >= 3) {
                 const QChar firstCharacter = editor->characterAt(startOfName);
                 if (firstCharacter.isLetter() || firstCharacter == QLatin1Char('_')) {
                     // Finally check that we're not inside a comment or string (code copied from startOfOperator)
@@ -1725,6 +1725,11 @@ void CppCodeCompletion::completions(QList<TextEditor::CompletionItem> *completio
             }
         }
     }
+
+    if (completions->size() == 1) {
+        if (key == completions->first().text)
+            completions->clear();
+    }
 }
 
 QList<TextEditor::CompletionItem> CppCodeCompletion::removeDuplicates(const QList<TextEditor::CompletionItem> &items)

src/plugins/texteditor/basetexteditor.cpp

@@ -61,6 +61,7 @@
 #include <QtCore/QDebug>
 #include <QtCore/QTimer>
 #include <QtCore/QTimeLine>
+#include <QtCore/QTime>
 #include <QtGui/QAbstractTextDocumentLayout>
 #include <QtGui/QApplication>
 #include <QtGui/QKeyEvent>
@@ -240,6 +241,11 @@ BaseTextEditor::BaseTextEditor(QWidget *parent)
     d->m_highlightBlocksTimer->setSingleShot(true);
     connect(d->m_highlightBlocksTimer, SIGNAL(timeout()), this, SLOT(_q_highlightBlocks()));
 
+    d->m_requestAutoCompletionTimer = new QTimer(this);
+    d->m_requestAutoCompletionTimer->setSingleShot(true);
+    d->m_requestAutoCompletionTimer->setInterval(500);
+    connect(d->m_requestAutoCompletionTimer, SIGNAL(timeout()), this, SLOT(_q_requestAutoCompletion()));
+
     d->m_animator = 0;
 
     d->m_searchResultFormat.setBackground(QColor(0xffef0b));
@@ -1380,18 +1386,38 @@ void BaseTextEditor::keyPressEvent(QKeyEvent *e)
         setTextCursor(cursor);
     }
 
-skip_event:
+    skip_event:
     if (!ro && e->key() == Qt::Key_Delete && d->m_parenthesesMatchingEnabled)
         d->m_parenthesesMatchingTimer->start(50);
 
 
-    if (!ro && d->m_contentsChanged && !e->text().isEmpty() && e->text().at(0).isPrint())
+    if (!ro && d->m_contentsChanged && !e->text().isEmpty() && e->text().at(0).isPrint()) {
-        emit requestAutoCompletion(editableInterface(), false);
+        maybeRequestAutoCompletion(e->text().at(0));
+    }
 
     if (e != original_e)
         delete e;
 }
 
+void BaseTextEditor::maybeRequestAutoCompletion(const QChar &ch)
+{
+    if (ch.isLetterOrNumber() || ch == QLatin1Char('_')) {
+        d->m_requestAutoCompletionRevision = document()->revision();
+        d->m_requestAutoCompletionTimer->start();
+    } else {
+        d->m_requestAutoCompletionTimer->stop();
+        emit requestAutoCompletion(editableInterface(), false);
+    }
+}
+
+void BaseTextEditor::_q_requestAutoCompletion()
+{
+    d->m_requestAutoCompletionTimer->stop();
+
+    if (d->m_requestAutoCompletionRevision == document()->revision())
+        emit requestAutoCompletion(editableInterface(), false);
+}
+
 void BaseTextEditor::insertCodeSnippet(const QTextCursor &cursor_arg, const QString &snippet)
 {
     if ((snippet.count('$') % 2) != 0) {
@@ -1908,6 +1934,8 @@ BaseTextEditorPrivate::BaseTextEditorPrivate()
     m_moveLineUndoHack(false),
     m_findScopeVerticalBlockSelection(0),
     m_highlightBlocksTimer(0),
+    m_requestAutoCompletionRevision(0),
+    m_requestAutoCompletionTimer(0),
     m_cursorBlockNumber(-1),
     m_inKeyPressEvent(false)
 {

src/plugins/texteditor/basetexteditor.h

@@ -496,6 +496,7 @@ signals:
     void requestQuickFix(TextEditor::ITextEditable *editor);
 
 private:
+    void maybeRequestAutoCompletion(const QChar &ch);
     void indentOrUnindent(bool doIndent);
     void handleHomeKey(bool anchor);
     void handleBackspaceKey();
@@ -527,13 +528,17 @@ private:
 
     void universalHelper(); // test function for development
 
-    // parentheses matcher
 private slots:
+    // auto completion
+    void _q_requestAutoCompletion();
+
+    // parentheses matcher
     void _q_matchParentheses();
     void _q_highlightBlocks();
     void slotSelectionChanged();
     void _q_animateUpdate(int position, QPointF lastPos, QRectF rect);
     void doFoo();
+
 };
 
 

src/plugins/texteditor/basetexteditor_p.h

@@ -263,6 +263,9 @@ public:
     BaseTextEditorPrivateHighlightBlocks m_highlightBlocksInfo;
     QTimer *m_highlightBlocksTimer;
 
+    int m_requestAutoCompletionRevision;
+    QTimer *m_requestAutoCompletionTimer;
+
     QPointer<BaseTextEditorAnimator> m_animator;
     int m_cursorBlockNumber;