debugger/iiomodel: Background population of all device/channel nodes.

Populate the IIOTree nodes in different QEvents to prevent the application
from freezing. I also retain the previous commit's functionality,
allowing a node to be loaded on demand by selecting or expanding it.

Signed-off-by: andreidanila1 <andrei.danila@analog.com>

Author: andreidanila1

packages/generic-plugins/plugins/debugger/include/debugger/iiomodel.h

@@ -41,6 +41,7 @@ class IIOModel : public QObject
 
 	// Lazily builds IIOWidget children for a device, trigger, or channel item.
 	void populateChildren(IIOStandardItem *item);
+	void scheduleFullPopulation();
 
 Q_SIGNALS:
 	void emitLog(QDateTime timestamp, bool isRead, QString path, QString oldValue, QString newValue,
@@ -55,6 +56,7 @@ class IIOModel : public QObject
 	void populateDeviceChildren(IIOStandardItem *item);
 	void populateChannelChildren(IIOStandardItem *item);
 	void buildEntries();
+	void processNextInQueue();
 	QStandardItem *createPlaceholderItem();
 
 	/**
@@ -91,6 +93,7 @@ class IIOModel : public QObject
 	int m_currentChannelIndex;
 
 	QList<IIOWidget *> m_ctxList;
+	QList<IIOStandardItem *> m_populationQueue;
 };
 } // namespace scopy::debugger
 

packages/generic-plugins/plugins/debugger/src/iioexplorer/iiomodel.cpp

@@ -21,6 +21,7 @@
 
 #include "iiomodel.h"
 #include <QLoggingCategory>
+#include <QTimer>
 
 #define BUFFER_SIZE 256
 #define SEPARATOR "/"
@@ -67,6 +68,9 @@ void IIOModel::iioTreeSetup()
 
 	// Pre-populate m_entries with attr names so SearchBar autocomplete works immediately
 	buildEntries();
+
+	// Starts background population so the full tree is available without user interaction
+	scheduleFullPopulation();
 }
 
 void IIOModel::setupCtx()
@@ -214,6 +218,38 @@ void IIOModel::populateChannelChildren(IIOStandardItem *item)
 	}
 }
 
+void IIOModel::scheduleFullPopulation()
+{
+	// Collect all device/trigger and channel items in tree order.
+	// Channel items are added after their parent device so that device attrs
+	// are populated before channel attrs, matching the visual tree order.
+	for(int i = 0; i < m_rootItem->rowCount(); ++i) {
+		auto *devItem = dynamic_cast<IIOStandardItem *>(m_rootItem->child(i));
+		if(!devItem) {
+			continue;
+		}
+		if(devItem->type() == IIOStandardItem::Device || devItem->type() == IIOStandardItem::Trigger) {
+			m_populationQueue.append(devItem);
+			for(int j = 0; j < devItem->rowCount(); ++j) {
+				auto *chnlItem = dynamic_cast<IIOStandardItem *>(devItem->child(j));
+				if(chnlItem && chnlItem->type() == IIOStandardItem::Channel) {
+					m_populationQueue.append(chnlItem);
+				}
+			}
+		}
+	}
+	QTimer::singleShot(0, this, &IIOModel::processNextInQueue);
+}
+
+void IIOModel::processNextInQueue()
+{
+	if(m_populationQueue.isEmpty()) {
+		return;
+	}
+	populateChildren(m_populationQueue.takeFirst());
+	QTimer::singleShot(0, this, &IIOModel::processNextInQueue);
+}
+
 void IIOModel::buildEntries()
 {
 	uint devCount = iio_context_get_devices_count(m_ctx);