make send coins dialog more user friendly (better checking)

TODO

@@ -92,3 +92,7 @@ Todo:
 
 - Check windows support / cross platform
 
+Check send dialog:
+    1MCwBbhNGp5hRm5rC1Aims2YFRe2SXPYKt
+
+

gui/forms/sendcoinsdialog.ui

@@ -64,6 +64,9 @@
        <property name="text">
         <string>&amp;Paste</string>
        </property>
+       <property name="autoDefault">
+        <bool>false</bool>
+       </property>
       </widget>
      </item>
      <item row="3" column="3">
@@ -71,6 +74,9 @@
        <property name="text">
         <string>Address &amp;Book...</string>
        </property>
+       <property name="autoDefault">
+        <bool>false</bool>
+       </property>
       </widget>
      </item>
      <item row="2" column="1">
@@ -124,6 +130,9 @@
         <iconset resource="../bitcoin.qrc">
          <normaloff>:/icons/send</normaloff>:/icons/send</iconset>
        </property>
+       <property name="default">
+        <bool>true</bool>
+       </property>
       </widget>
      </item>
      <item>
@@ -146,22 +155,5 @@
  <resources>
   <include location="../bitcoin.qrc"/>
  </resources>
- <connections>
-  <connection>
-   <sender>payAmount</sender>
-   <signal>returnPressed()</signal>
-   <receiver>sendButton</receiver>
-   <slot>click()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>191</x>
-     <y>65</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>570</x>
-     <y>121</y>
-    </hint>
-   </hints>
-  </connection>
- </connections>
+ <connections/>
 </ui>

gui/include/sendcoinsdialog.h

@@ -12,7 +12,7 @@ class SendCoinsDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit SendCoinsDialog(QWidget *parent = 0);
+    explicit SendCoinsDialog(QWidget *parent = 0, const QString &address = "");
     ~SendCoinsDialog();
 
 private:

gui/src/addressbookdialog.cpp

@@ -127,6 +127,12 @@ void AddressBookDialog::on_buttonBox_accepted()
         QVariant address = table->model()->data(index);
         returnValue = address.toString();
     }
-
-    accept();
+    if(!returnValue.isEmpty())
+    {
+        accept();
+    }
+    else
+    {
+        reject();
+    }
 }

gui/src/bitcoingui.cpp

@@ -211,7 +211,12 @@ void BitcoinGUI::addressbookClicked()
     qDebug() << "Address book clicked";
     AddressBookDialog dlg;
     dlg.setTab(AddressBookDialog::SendingTab);
-    dlg.exec();
+    /* if an address accepted, do a 'send' to specified address */
+    if(dlg.exec())
+    {
+        SendCoinsDialog send(0, dlg.getReturnValue());
+        send.exec();
+    }
 }
 
 void BitcoinGUI::receivingAddressesClicked()

gui/src/sendcoinsdialog.cpp

@@ -6,17 +6,31 @@
 
 #include <QApplication>
 #include <QClipboard>
+#include <QMessageBox>
+#include <QLocale>
 
 #include "base58.h"
 
-SendCoinsDialog::SendCoinsDialog(QWidget *parent) :
+SendCoinsDialog::SendCoinsDialog(QWidget *parent, const QString &address) :
     QDialog(parent),
     ui(new Ui::SendCoinsDialog)
 {
     ui->setupUi(this);
+
+    /* Set up validators */
     ui->payTo->setMaxLength(BitcoinAddressValidator::MaxAddressLength);
     ui->payTo->setValidator(new BitcoinAddressValidator(this));
-    ui->payAmount->setValidator(new QDoubleValidator(this));
+    QDoubleValidator *amountValidator = new QDoubleValidator(this);
+    amountValidator->setDecimals(8);
+    amountValidator->setBottom(0.0);
+    ui->payAmount->setValidator(amountValidator);
+
+    /* Set initial address if provided */
+    if(!address.isEmpty())
+    {
+        ui->payTo->setText(address);
+        ui->payAmount->setFocus();
+    }
 }
 
 SendCoinsDialog::~SendCoinsDialog()
@@ -28,14 +42,31 @@ void SendCoinsDialog::on_sendButton_clicked()
 {
     QByteArray payTo = ui->payTo->text().toUtf8();
     uint160 payToHash = 0;
-    if(AddressToHash160(payTo.constData(), payToHash))
-    {
-        accept();
-    }
-    else
-    {
+    double payAmount = 0.0;
+    bool valid = false;
 
+    if(!AddressToHash160(payTo.constData(), payToHash))
+    {
+        QMessageBox::warning(this, tr("Warning"),
+                                       tr("The recepient address is not valid, please recheck."),
+                                       QMessageBox::Ok,
+                                       QMessageBox::Ok);
+        ui->payTo->setFocus();
+        return;
     }
+    payAmount = QLocale::system().toDouble(ui->payAmount->text(), &valid);
+    if(!valid || payAmount <= 0.0)
+    {
+        QMessageBox::warning(this, tr("Warning"),
+                                       tr("The amount to pay must be a valid number larger than 0."),
+                                       QMessageBox::Ok,
+                                       QMessageBox::Ok);
+        ui->payAmount->setFocus();
+        return;
+    }
+
+    /* TODO: send command to core, once this succeeds do accept() */
+    accept();
 }
 
 void SendCoinsDialog::on_pasteButton_clicked()