Merge pull request #1205 from laanwj/2012_05_granular_ui_notifications

Finer-grained UI updates, move UI interface to boost::signals

1 files changed, 85 insertions, 17 deletions

diff --git a/src/qt/clientmodel.cpp b/src/qt/clientmodel.cpp
index 85ab03612d..64fd2a9450 100644
--- a/src/qt/clientmodel.cpp
+++ b/src/qt/clientmodel.cpp
@@ -5,15 +5,30 @@
 #include "transactiontablemodel.h"
 
 #include "main.h"
-static const int64 nClientStartupTime = GetTime();
+#include "ui_interface.h"
 
 #include <QDateTime>
+#include <QTimer>
+
+static const int64 nClientStartupTime = GetTime();
 
 ClientModel::ClientModel(OptionsModel *optionsModel, QObject *parent) :
     QObject(parent), optionsModel(optionsModel),
-    cachedNumConnections(0), cachedNumBlocks(0)
+    cachedNumBlocks(0), cachedNumBlocksOfPeers(0), pollTimer(0)
 {
     numBlocksAtStartup = -1;
+
+    pollTimer = new QTimer();
+    pollTimer->setInterval(MODEL_UPDATE_DELAY);
+    pollTimer->start();
+    connect(pollTimer, SIGNAL(timeout()), this, SLOT(updateTimer()));
+
+    subscribeToCoreSignals();
+}
+
+ClientModel::~ClientModel()
+{
+    unsubscribeFromCoreSignals();
 }
 
 int ClientModel::getNumConnections() const
@@ -37,27 +52,42 @@ QDateTime ClientModel::getLastBlockDate() const
     return QDateTime::fromTime_t(pindexBest->GetBlockTime());
 }
 
-void ClientModel::update()
+void ClientModel::updateTimer()
 {
-    int newNumConnections = getNumConnections();
+    // Some quantities (such as number of blocks) change so fast that we don't want to be notified for each change.
+    // Periodically check and update with a timer.
     int newNumBlocks = getNumBlocks();
-    QString newStatusBar = getStatusBarWarnings();
+    int newNumBlocksOfPeers = getNumBlocksOfPeers();
 
-    if(cachedNumConnections != newNumConnections)
-        emit numConnectionsChanged(newNumConnections);
-    if(cachedNumBlocks != newNumBlocks || cachedStatusBar != newStatusBar)
+    if(cachedNumBlocks != newNumBlocks || cachedNumBlocksOfPeers != newNumBlocksOfPeers)
+        emit numBlocksChanged(newNumBlocks, newNumBlocksOfPeers);
+
+    cachedNumBlocks = newNumBlocks;
+    cachedNumBlocksOfPeers = newNumBlocksOfPeers;
+}
+
+void ClientModel::updateNumConnections(int numConnections)
+{
+    emit numConnectionsChanged(numConnections);
+}
+
+void ClientModel::updateAlert(const QString &hash, int status)
+{
+    // Show error message notification for new alert
+    if(status == CT_NEW)
     {
-        // Simply emit a numBlocksChanged for now in case the status message changes,
-        // so that the view updates the status bar.
-        // TODO: It should send a notification.
-        //    (However, this might generate looped notifications and needs to be thought through and tested carefully)
-        //    error(tr("Network Alert"), newStatusBar);
-        emit numBlocksChanged(newNumBlocks);
+        uint256 hash_256;
+        hash_256.SetHex(hash.toStdString());
+        CAlert alert = CAlert::getAlertByHash(hash_256);
+        if(!alert.IsNull())
+        {
+            emit error(tr("Network Alert"), QString::fromStdString(alert.strStatusBar), false);
+        }
     }
 
-    cachedNumConnections = newNumConnections;
-    cachedNumBlocks = newNumBlocks;
-    cachedStatusBar = newStatusBar;
+    // Emit a numBlocksChanged when the status message changes,
+    // so that the view recomputes and updates the status bar.
+    emit numBlocksChanged(getNumBlocks(), getNumBlocksOfPeers());
 }
 
 bool ClientModel::isTestNet() const
@@ -104,3 +134,41 @@ QDateTime ClientModel::formatClientStartupTime() const
 {
     return QDateTime::fromTime_t(nClientStartupTime);
 }
+
+// Handlers for core signals
+static void NotifyBlocksChanged(ClientModel *clientmodel)
+{
+    // This notification is too frequent. Don't trigger a signal.
+    // Don't remove it, though, as it might be useful later.
+}
+
+static void NotifyNumConnectionsChanged(ClientModel *clientmodel, int newNumConnections)
+{
+    // Too noisy: OutputDebugStringF("NotifyNumConnectionsChanged %i\n", newNumConnections);
+    QMetaObject::invokeMethod(clientmodel, "updateNumConnections", Qt::QueuedConnection,
+                              Q_ARG(int, newNumConnections));
+}
+
+static void NotifyAlertChanged(ClientModel *clientmodel, const uint256 &hash, ChangeType status)
+{
+    OutputDebugStringF("NotifyAlertChanged %s status=%i\n", hash.GetHex().c_str(), status);
+    QMetaObject::invokeMethod(clientmodel, "updateAlert", Qt::QueuedConnection,
+                              Q_ARG(QString, QString::fromStdString(hash.GetHex())),
+                              Q_ARG(int, status));
+}
+
+void ClientModel::subscribeToCoreSignals()
+{
+    // Connect signals to client
+    uiInterface.NotifyBlocksChanged.connect(boost::bind(NotifyBlocksChanged, this));
+    uiInterface.NotifyNumConnectionsChanged.connect(boost::bind(NotifyNumConnectionsChanged, this, _1));
+    uiInterface.NotifyAlertChanged.connect(boost::bind(NotifyAlertChanged, this, _1, _2));
+}
+
+void ClientModel::unsubscribeFromCoreSignals()
+{
+    // Disconnect signals from client
+    uiInterface.NotifyBlocksChanged.disconnect(boost::bind(NotifyBlocksChanged, this));
+    uiInterface.NotifyNumConnectionsChanged.disconnect(boost::bind(NotifyNumConnectionsChanged, this, _1));
+    uiInterface.NotifyAlertChanged.disconnect(boost::bind(NotifyAlertChanged, this, _1, _2));
+}