[Qt] small cleanup of coincontroldialog

- use a little more Qt-style
- check for NULL pointers first and return in updateView()
- small space and formating changes

src/qt/coincontroldialog.cpp

@@ -97,7 +97,7 @@ CoinControlDialog::CoinControlDialog(QWidget *parent) :
     connect(ui->radioListMode, SIGNAL(toggled(bool)), this, SLOT(radioListMode(bool)));
 
     // click on checkbox
-    connect(ui->treeWidget, SIGNAL(itemChanged( QTreeWidgetItem*, int)), this, SLOT(viewItemChanged( QTreeWidgetItem*, int)));
+    connect(ui->treeWidget, SIGNAL(itemChanged(QTreeWidgetItem*, int)), this, SLOT(viewItemChanged(QTreeWidgetItem*, int)));
 
     // click on header
 #if QT_VERSION < 0x050000
@@ -434,7 +434,8 @@ void CoinControlDialog::updateLabelLocked()
 
 void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
 {
-    if (!model) return;
+    if (!model)
+        return;
 
     // nPayAmount
     qint64 nPayAmount = 0;
@@ -640,17 +641,18 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
 
 void CoinControlDialog::updateView()
 {
+    if (!model || !model->getOptionsModel() || !model->getAddressTableModel())
+        return;
+
     bool treeMode = ui->radioTreeMode->isChecked();
 
     ui->treeWidget->clear();
     ui->treeWidget->setEnabled(false); // performance, otherwise updateLabels would be called for every checked checkbox
     ui->treeWidget->setAlternatingRowColors(!treeMode);
-    QFlags<Qt::ItemFlag> flgCheckbox=Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsUserCheckable;
+    QFlags<Qt::ItemFlag> flgCheckbox = Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsUserCheckable;
-    QFlags<Qt::ItemFlag> flgTristate=Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsUserCheckable | Qt::ItemIsTristate;
+    QFlags<Qt::ItemFlag> flgTristate = Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsUserCheckable | Qt::ItemIsTristate;
 
-    int nDisplayUnit = BitcoinUnits::BTC;
+    int nDisplayUnit = model->getOptionsModel()->getDisplayUnit();
-    if (model && model->getOptionsModel())
-        nDisplayUnit = model->getOptionsModel()->getDisplayUnit();
 
     map<QString, vector<COutput> > mapCoins;
     model->listCoins(mapCoins);
@@ -658,11 +660,10 @@ void CoinControlDialog::updateView()
     BOOST_FOREACH(PAIRTYPE(QString, vector<COutput>) coins, mapCoins)
     {
         QTreeWidgetItem *itemWalletAddress = new QTreeWidgetItem();
+        itemWalletAddress->setCheckState(COLUMN_CHECKBOX, Qt::Unchecked);
         QString sWalletAddress = coins.first;
-        QString sWalletLabel = "";
+        QString sWalletLabel = model->getAddressTableModel()->labelForAddress(sWalletAddress);
-        if (model->getAddressTableModel())
+        if (sWalletLabel.isEmpty())
-            sWalletLabel = model->getAddressTableModel()->labelForAddress(sWalletAddress);
-        if (sWalletLabel.length() == 0)
             sWalletLabel = tr("(no label)");
 
         if (treeMode)
@@ -671,7 +672,7 @@ void CoinControlDialog::updateView()
             ui->treeWidget->addTopLevelItem(itemWalletAddress);
 
             itemWalletAddress->setFlags(flgTristate);
-            itemWalletAddress->setCheckState(COLUMN_CHECKBOX,Qt::Unchecked);
+            itemWalletAddress->setCheckState(COLUMN_CHECKBOX, Qt::Unchecked);
 
             // label
             itemWalletAddress->setText(COLUMN_LABEL, sWalletLabel);
@@ -722,10 +723,8 @@ void CoinControlDialog::updateView()
             }
             else if (!treeMode)
             {
-                QString sLabel = "";
+                QString sLabel = model->getAddressTableModel()->labelForAddress(sAddress);
-                if (model->getAddressTableModel())
+                if (sLabel.isEmpty())
-                    sLabel = model->getAddressTableModel()->labelForAddress(sAddress);
-                if (sLabel.length() == 0)
                     sLabel = tr("(no label)");
                 itemOutput->setText(COLUMN_LABEL, sLabel);
             }
@@ -766,7 +765,7 @@ void CoinControlDialog::updateView()
 
             // set checkbox
             if (coinControl->IsSelected(txhash, out.i))
-                itemOutput->setCheckState(COLUMN_CHECKBOX,Qt::Checked);
+                itemOutput->setCheckState(COLUMN_CHECKBOX, Qt::Checked);
         }
 
         // amount