[Qt] Replace status bar unit icon with actual images

src/Makefile.qt.include

@@ -252,7 +252,10 @@ RES_ICONS = \
   qt/res/icons/tx_inout.png \
   qt/res/icons/tx_input.png \
   qt/res/icons/tx_output.png \
-  qt/res/icons/tx_mined.png
+  qt/res/icons/tx_mined.png \
+  qt/res/icons/unit_btc.png \
+  qt/res/icons/unit_mbtc.png \
+  qt/res/icons/unit_ubtc.png
 
 BITCOIN_QT_CPP = \
   qt/bitcoinaddressvalidator.cpp \

src/qt/bitcoin.qrc

@@ -35,6 +35,9 @@
         <file alias="tx_input">res/icons/tx_input.png</file>
         <file alias="tx_output">res/icons/tx_output.png</file>
         <file alias="tx_inout">res/icons/tx_inout.png</file>
+        <file alias="unit_btc">res/icons/unit_btc.png</file>
+        <file alias="unit_mbtc">res/icons/unit_mbtc.png</file>
+        <file alias="unit_ubtc">res/icons/unit_ubtc.png</file>
         <file alias="lock_closed">res/icons/lock_closed.png</file>
         <file alias="lock_open">res/icons/lock_open.png</file>
         <file alias="key">res/icons/key.png</file>

src/qt/bitcoingui.cpp

@@ -1014,7 +1014,6 @@ UnitDisplayStatusBarControl::UnitDisplayStatusBarControl():QLabel()
 {
     optionsModel = 0;
     createContextMenu();
-    setStyleSheet("font:11pt; color: #333333");
     setToolTip(tr("Unit to show amounts in. Click to select another unit."));
 }
 
@@ -1059,7 +1058,7 @@ void UnitDisplayStatusBarControl::setOptionsModel(OptionsModel *optionsModel)
 /** When Display Units are changed on OptionsModel it will refresh the display text of the control on the status bar */
 void UnitDisplayStatusBarControl::updateDisplayUnit(int newUnits)
 {
-    setText(BitcoinUnits::name(newUnits));
+    setPixmap(QIcon(":/icons/unit_" + BitcoinUnits::id(newUnits)).pixmap(31,STATUSBAR_ICONSIZE));
 }
 
 /** Shows context menu with Display Unit options by the mouse coordinates */

src/qt/bitcoinunits.cpp

@@ -34,6 +34,17 @@ bool BitcoinUnits::valid(int unit)
     }
 }
 
+QString BitcoinUnits::id(int unit)
+{
+    switch(unit)
+    {
+    case BTC: return QString("btc");
+    case mBTC: return QString("mbtc");
+    case uBTC: return QString("ubtc");
+    default: return QString("???");
+    }
+}
+
 QString BitcoinUnits::name(int unit)
 {
     switch(unit)

src/qt/bitcoinunits.h

@@ -36,6 +36,8 @@ public:
     static QList<Unit> availableUnits();
     //! Is unit ID valid?
     static bool valid(int unit);
+    //! Identifier, e.g. for image names
+    static QString id(int unit);
     //! Short name
     static QString name(int unit);
     //! Longer description