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, 3 insertions, 1 deletions

diff --git a/src/qt/signverifymessagedialog.h b/src/qt/signverifymessagedialog.h
index bf841e4f8b..d651d5049b 100644
--- a/src/qt/signverifymessagedialog.h
+++ b/src/qt/signverifymessagedialog.h
@@ -7,6 +7,7 @@
 
 #include <QDialog>
 
+class PlatformStyle;
 class WalletModel;
 
 namespace Ui {
@@ -18,7 +19,7 @@ class SignVerifyMessageDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit SignVerifyMessageDialog(QWidget *parent);
+    explicit SignVerifyMessageDialog(const PlatformStyle *platformStyle, QWidget *parent);
     ~SignVerifyMessageDialog();
 
     void setModel(WalletModel *model);
@@ -34,6 +35,7 @@ protected:
 private:
     Ui::SignVerifyMessageDialog *ui;
     WalletModel *model;
+    const PlatformStyle *platformStyle;
 
 private Q_SLOTS:
     /* sign message */