debugger: speed up logging by collecting bigger chunks

Change-Id: Ie2171e0afdc0e3296f57974b1e4e5ee952658626
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/logwindow.cpp

@@ -394,6 +394,8 @@ LogWindow::LogWindow(QWidget *parent)
     connect(m_inputText, SIGNAL(executeLineRequested()),
         SLOT(executeLine()));
 
+    connect(&m_outputTimer, SIGNAL(timeout()), SLOT(doOutput()));
+
     setMinimumHeight(60);
 }
 
@@ -414,9 +416,6 @@ void LogWindow::showOutput(int channel, const QString &output)
     if (output.isEmpty())
         return;
 
-    QTextCursor cursor = m_combinedText->textCursor();
-    const bool atEnd = cursor.atEnd();
-
     const QChar cchar = charForChannel(channel);
     const QChar nchar = QLatin1Char('\n');
 
@@ -445,7 +444,24 @@ void LogWindow::showOutput(int channel, const QString &output)
         }
         pos = nnpos + 1;
     }
-    m_combinedText->append(out);
+    if (!out.endsWith(nchar))
+        out.append(nchar);
+
+    m_queuedOutput.append(out);
+    m_outputTimer.setSingleShot(true);
+    m_outputTimer.start(80);
+}
+
+void LogWindow::doOutput()
+{
+    if (m_queuedOutput.isEmpty())
+        return;
+
+    QTextCursor cursor = m_combinedText->textCursor();
+    const bool atEnd = cursor.atEnd();
+
+    m_combinedText->append(m_queuedOutput);
+    m_queuedOutput.clear();
 
     if (atEnd) {
         cursor.movePosition(QTextCursor::End);

src/plugins/debugger/logwindow.h

@@ -36,6 +36,7 @@
 #include "debuggerconstants.h"
 
 #include <QWidget>
+#include <QTimer>
 
 QT_BEGIN_NAMESPACE
 class QCursor;
@@ -74,6 +75,7 @@ public slots:
     void executeLine();
     void showOutput(int channel, const QString &output);
     void showInput(int channel, const QString &input);
+    void doOutput();
 
 signals:
     void showPage();
@@ -82,12 +84,13 @@ signals:
 private:
     DebuggerPane *m_combinedText;  // combined input/output
     DebuggerPane *m_inputText;     // scriptable input alone
+    QTimer m_outputTimer;
+    QString m_queuedOutput;
     QLineEdit *m_commandEdit;
     QLabel *m_commandLabel;
     bool m_ignoreNextInputEcho;
 };
 
-
 } // namespace Internal
 } // namespace Debugger