hellovulkanwidget example: Add a widget showing debug output

Add a tab widget for vulkan info and debug log.

Change-Id: I0428bb5b6f847d0e94d62e846d34e4cb69eda5b6
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

examples/vulkan/hellovulkanwidget/hellovulkanwidget.cpp

@@ -52,18 +52,19 @@
 #include <QVulkanFunctions>
 #include <QApplication>
 #include <QVBoxLayout>
-#include <QTextEdit>
+#include <QPlainTextEdit>
 #include <QPushButton>
 #include <QLCDNumber>
 #include <QFileDialog>
 #include <QMessageBox>
+#include <QTabWidget>
 
-MainWindow::MainWindow(VulkanWindow *w)
+MainWindow::MainWindow(VulkanWindow *w, QPlainTextEdit *logWidget)
     : m_window(w)
 {
     QWidget *wrapper = QWidget::createWindowContainer(w);
 
-    m_info = new QTextEdit;
+    m_info = new QPlainTextEdit;
     m_info->setReadOnly(true);
 
     m_number = new QLCDNumber(3);
@@ -80,7 +81,10 @@ MainWindow::MainWindow(VulkanWindow *w)
     connect(quitButton, &QPushButton::clicked, qApp, &QCoreApplication::quit);
 
     QVBoxLayout *layout = new QVBoxLayout;
-    layout->addWidget(m_info, 2);
+    m_infoTab = new QTabWidget(this);
+    m_infoTab->addTab(m_info, tr("Vulkan Info"));
+    m_infoTab->addTab(logWidget, tr("Debug Log"));
+    layout->addWidget(m_infoTab, 2);
     layout->addWidget(m_number, 1);
     layout->addWidget(wrapper, 5);
     layout->addWidget(grabButton, 1);
@@ -90,7 +94,7 @@ MainWindow::MainWindow(VulkanWindow *w)
 
 void MainWindow::onVulkanInfoReceived(const QString &text)
 {
-    m_info->setText(text);
+    m_info->setPlainText(text);
 }
 
 void MainWindow::onFrameQueued(int colorValue)

examples/vulkan/hellovulkanwidget/hellovulkanwidget.h

@@ -54,7 +54,8 @@
 class VulkanWindow;
 
 QT_BEGIN_NAMESPACE
-class QTextEdit;
+class QTabWidget;
+class QPlainTextEdit;
 class QLCDNumber;
 QT_END_NAMESPACE
 
@@ -63,7 +64,7 @@ class MainWindow : public QWidget
     Q_OBJECT
 
 public:
-    MainWindow(VulkanWindow *w);
+    explicit MainWindow(VulkanWindow *w, QPlainTextEdit *logWidget);
 
 public slots:
     void onVulkanInfoReceived(const QString &text);
@@ -72,7 +73,8 @@ public slots:
 
 private:
     VulkanWindow *m_window;
-    QTextEdit *m_info;
+    QTabWidget *m_infoTab;
+    QPlainTextEdit *m_info;
     QLCDNumber *m_number;
 };
 

examples/vulkan/hellovulkanwidget/main.cpp

@@ -49,16 +49,35 @@
 ****************************************************************************/
 
 #include <QApplication>
+#include <QPlainTextEdit>
 #include <QVulkanInstance>
+#include <QLibraryInfo>
 #include <QLoggingCategory>
+#include <QPointer>
 #include "hellovulkanwidget.h"
 
 Q_LOGGING_CATEGORY(lcVk, "qt.vulkan")
 
+static QPointer<QPlainTextEdit> messageLogWidget;
+static QtMessageHandler oldMessageHandler = nullptr;
+
+static void messageHandler(QtMsgType msgType, const QMessageLogContext &logContext, const QString &text)
+{
+    if (!messageLogWidget.isNull())
+        messageLogWidget->appendPlainText(text);
+    if (oldMessageHandler)
+        oldMessageHandler(msgType, logContext, text);
+}
+
 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
 
+    messageLogWidget = new QPlainTextEdit(QLatin1String(QLibraryInfo::build()) + QLatin1Char('\n'));
+    messageLogWidget->setReadOnly(true);
+
+    oldMessageHandler = qInstallMessageHandler(messageHandler);
+
     QLoggingCategory::setFilterRules(QStringLiteral("qt.vulkan=true"));
 
     QVulkanInstance inst;
@@ -82,7 +101,7 @@ int main(int argc, char *argv[])
     VulkanWindow *vulkanWindow = new VulkanWindow;
     vulkanWindow->setVulkanInstance(&inst);
 
-    MainWindow mainWindow(vulkanWindow);
+    MainWindow mainWindow(vulkanWindow, messageLogWidget.data());
     QObject::connect(vulkanWindow, &VulkanWindow::vulkanInfoReceived, &mainWindow, &MainWindow::onVulkanInfoReceived);
     QObject::connect(vulkanWindow, &VulkanWindow::frameQueued, &mainWindow, &MainWindow::onFrameQueued);