qt: Introduce PlatformStyle

Introduce a PlatformStyle to handle platform-specific customization of
the UI.

This replaces 'scicon', as well as #ifdefs to determine whether to place
icons on buttons.

The selected PlatformStyle defaults to the platform that the application
was compiled on, but can be overridden from the command line with
`-uiplatform=<x>`.

Also fixes the warning from #6328.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
index 4e50b1712a..dd0d4bb0e2 100644
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -22,6 +22,7 @@ class ClientModel;
 class NetworkStyle;
 class Notificator;
 class OptionsModel;
+class PlatformStyle;
 class RPCConsole;
 class SendCoinsRecipient;
 class UnitDisplayStatusBarControl;
@@ -47,7 +48,7 @@ class BitcoinGUI : public QMainWindow
 public:
     static const QString DEFAULT_WALLET;
 
-    explicit BitcoinGUI(const NetworkStyle *networkStyle, QWidget *parent = 0);
+    explicit BitcoinGUI(const PlatformStyle *platformStyle, const NetworkStyle *networkStyle, QWidget *parent = 0);
     ~BitcoinGUI();
 
     /** Set the client model.
@@ -117,6 +118,8 @@ private:
     int prevBlocks;
     int spinnerFrame;
 
+    const PlatformStyle *platformStyle;
+
     /** Create the main UI actions. */
     void createActions();
     /** Create the menu bar and sub-menus. */
@@ -215,7 +218,7 @@ class UnitDisplayStatusBarControl : public QLabel
     Q_OBJECT
 
 public:
-    explicit UnitDisplayStatusBarControl();
+    explicit UnitDisplayStatusBarControl(const PlatformStyle *platformStyle);
     /** Lets the control know about the Options Model (and its signals) */
     void setOptionsModel(OptionsModel *optionsModel);