qt: Display txfee in first sendCoinsDialog message box

Signed-off-by: Jonas Schnelli <jonas.schnelli@include7.ch>

src/qt/walletmodeltransaction.h

@@ -0,0 +1,37 @@
+#ifndef WALLETMODELTRANSACTION_H
+#define WALLETMODELTRANSACTION_H
+
+#include "walletmodel.h"
+
+class SendCoinsRecipient;
+
+/** Data model for a walletmodel transaction. */
+class WalletModelTransaction
+{
+public:
+    explicit WalletModelTransaction(const QList<SendCoinsRecipient> &recipients);
+    ~WalletModelTransaction();
+
+    QList<SendCoinsRecipient> getRecipients();
+
+    CWalletTx *getTransaction();
+
+    void setTransactionFee(qint64 newFee);
+    qint64 getTransactionFee();
+
+    qint64 getTotalTransactionAmount();
+
+    void newPossibleKeyChange(CWallet *wallet);
+    CReserveKey *getPossibleKeyChange();
+
+private:
+    const QList<SendCoinsRecipient> recipients;
+    CWalletTx *walletTransaction;
+    CReserveKey *keyChange;
+    qint64 fee;
+
+public slots:
+
+};
+
+#endif // WALLETMODELTRANSACTION_H