qt log viewer now works

qt/i2pd_qt/logviewermanager.h

@@ -0,0 +1,130 @@
+#ifndef LOGVIEWERMANAGER_H
+#define LOGVIEWERMANAGER_H
+
+#include <QObject>
+#include <QString>
+#include <QPlainTextEdit>
+#include <QScrollBar>
+#include <QComboBox>
+#include <QTimer>
+#include <QThread>
+
+#include <assert.h>
+#include <string>
+
+#include "FS.h"
+#include "Log.h"
+
+class LogViewerManager;
+
+namespace i2pd {
+namespace qt {
+namespace logviewer {
+
+class Worker : public QObject
+{
+    Q_OBJECT
+private:
+    LogViewerManager &logViewerManager;
+public:
+    Worker(LogViewerManager &parameter1):logViewerManager(parameter1){}
+private:
+    QString pollAndShootATimerForInfiniteRetries();
+
+public slots:
+    void doWork1() {
+        /* ... here is the expensive or blocking operation ... */
+        QString read=pollAndShootATimerForInfiniteRetries();
+        emit resultReady(read);
+    }
+
+signals:
+    void resultReady(QString read);
+};
+
+class Controller : public QObject
+{
+    Q_OBJECT
+    QThread workerThread;
+    LogViewerManager& logViewerManager;
+    int timerId;
+public:
+    Controller(LogViewerManager &parameter1);
+    ~Controller() {
+        if(timerId!=0)killTimer(timerId);
+        workerThread.quit();
+        workerThread.wait();
+    }
+signals:
+    void operate1();
+protected:
+    void timerEvent(QTimerEvent */*event*/) {
+        emit operate1();
+    }
+};
+
+}
+}
+}
+
+class LogViewerManager : public QObject
+{
+    Q_OBJECT
+private:
+    std::shared_ptr<std::iostream> logStream;
+    QPlainTextEdit* logTextEdit;
+    i2pd::qt::logviewer::Controller* controllerForBgThread;
+public:
+    //also starts a bg thread (QTimer) polling logStream->readsome(buf, n)
+    explicit LogViewerManager(std::shared_ptr<std::iostream> logStream_,
+                              QPlainTextEdit* logTextEdit_,
+                              QObject *parent);
+    //also deallocs the bg thread (QTimer)
+    virtual ~LogViewerManager(){}
+    const i2pd::qt::logviewer::Controller& getControllerForBgThread() {
+        assert(controllerForBgThread!=nullptr);
+        return *controllerForBgThread;
+    }
+    const QPlainTextEdit* getLogTextEdit(){ return logTextEdit; }
+    const std::shared_ptr<std::iostream> getLogStream(){ return logStream; }
+signals:
+
+public slots:
+    //void appendFromNonGuiThread(std::string read) {
+    //}
+public slots:
+    void appendPlainText_atGuiThread(QString plainText) {
+        if(plainText.length()==0)return;
+        assert(logTextEdit!=nullptr);
+        int scrollPosVert =logTextEdit->verticalScrollBar()->value();
+        int scrollPosHoriz=logTextEdit->horizontalScrollBar()->value();
+        int scrollPosVertMax =logTextEdit->verticalScrollBar()->maximum();
+        const int MAX_LINES=10*1024;
+        logTextEdit->setMaximumBlockCount(MAX_LINES);
+        //logTextEdit->appendPlainText(plainText);
+        //navigate the window to the end
+        //QTextCursor cursor = logTextEdit->textCursor();
+        //cursor.movePosition(QTextCursor::MoveOperation::End);
+        //logTextEdit->setTextCursor(cursor);
+        //QTextCursor prev_cursor = logTextEdit->textCursor();
+        logTextEdit->moveCursor(QTextCursor::End);
+        logTextEdit->insertPlainText(plainText);
+        if(/*prev_cursor.atEnd()*/scrollPosVert==scrollPosVertMax){
+            //logTextEdit->moveCursor(QTextCursor::End);
+            scrollPosVert =logTextEdit->verticalScrollBar()->maximum();
+            scrollPosHoriz=logTextEdit->horizontalScrollBar()->minimum();
+        }
+        //else
+        //    logTextEdit->setTextCursor(prev_cursor);
+        logTextEdit->verticalScrollBar()->setValue(scrollPosVert);
+        logTextEdit->horizontalScrollBar()->setValue(scrollPosHoriz);
+    }
+    /*
+    void replaceText_atGuiThread() {
+        assert(logTextEdit!=nullptr);
+        logTextEdit->setText(QString::fromStdString(nav.getContent()));
+    }
+    */
+};
+
+#endif // LOGVIEWERMANAGER_H