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, 2 insertions, 1 deletions

diff --git a/src/qt/transactionview.h b/src/qt/transactionview.h
index 6c35362be4..ac157fb98d 100644
--- a/src/qt/transactionview.h
+++ b/src/qt/transactionview.h
@@ -10,6 +10,7 @@
 #include <QWidget>
 #include <QKeyEvent>
 
+class PlatformStyle;
 class TransactionFilterProxy;
 class WalletModel;
 
@@ -32,7 +33,7 @@ class TransactionView : public QWidget
     Q_OBJECT
 
 public:
-    explicit TransactionView(QWidget *parent = 0);
+    explicit TransactionView(const PlatformStyle *platformStyle, QWidget *parent = 0);
 
     void setModel(WalletModel *model);