M src/platform/qt/LogView.cpp → src/platform/qt/LogView.cpp

@@ -69,7 +69,12 @@ connect(this, SIGNAL(levelsDisabled(int)), log, SLOT(disableLevels(int)));
 }
 
 void LogView::postLog(int level, const QString& log) {
-	m_ui.view->appendPlainText(QString("%1:\t%2").arg(LogController::toString(level)).arg(log));
+	QString line = QString("%1:\t%2").arg(LogController::toString(level)).arg(log);
+	if (isVisible()) {
+		m_ui.view->appendPlainText(line);
+	} else {
+		m_pendingLines.enqueue(line);
+	}
 	++m_lines;
 	if (m_lines > m_lineLimit) {
 		clearLine();
@@ -140,11 +145,21 @@ clearLine();
 	}
 }
 
+void LogView::showEvent(QShowEvent*) {
+	while (!m_pendingLines.isEmpty()) {
+		m_ui.view->appendPlainText(m_pendingLines.dequeue());
+	}
+}
+
 void LogView::clearLine() {
-	QTextCursor cursor(m_ui.view->document());
-	cursor.setPosition(0);
-	cursor.select(QTextCursor::BlockUnderCursor);
-	cursor.removeSelectedText();
-	cursor.deleteChar();
+	if (m_ui.view->document()->isEmpty()) {
+		m_pendingLines.dequeue();
+	} else {
+		QTextCursor cursor(m_ui.view->document());
+		cursor.setPosition(0);
+		cursor.select(QTextCursor::BlockUnderCursor);
+		cursor.removeSelectedText();
+		cursor.deleteChar();
+	}
 	--m_lines;
 }

M src/platform/qt/LogView.h → src/platform/qt/LogView.h

@@ -6,6 +6,7 @@ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #ifndef QGBA_LOG_VIEW
 #define QGBA_LOG_VIEW
 
+#include <QQueue>
 #include <QWidget>
 
 #include "ui_LogView.h"
@@ -36,12 +37,16 @@
 private slots:
 	void setMaxLines(int);
 
+protected:
+	virtual void showEvent(QShowEvent*) override;
+
 private:
 	static const int DEFAULT_LINE_LIMIT = 1000;
 
 	Ui::LogView m_ui;
 	int m_lines;
 	int m_lineLimit;
+	QQueue<QString> m_pendingLines;
 
 	void setLevel(int level, bool);