Merge bitcoin-core/gui#275: Support runtime appearance adjustment on macOS

c231254a65d390a3350fcef456d57e4a6eca0506 qt: Make TransactionView aware of runtime palette change (Hennadii Stepanov)
2b622d4aced1848393989ee906b1f9d2436f1c1a qt: Make CoinControlDialog aware of runtime palette change (Hennadii Stepanov)
97a6b5e06a532a4ee029c8ba59c3438369f8b049 qt: Make OverviewPage aware of runtime palette change (Hennadii Stepanov)
d05f1b278d9846de5142a4ac3f53c84145330dd1 qt: Make UnitDisplayStatusBarControl aware of runtime palette change (Hennadii Stepanov)
6b2ce65392dc98250e84941370e975048b8afc54 qt: Replace base class of ClickableLabel with ThemedLabel (Hennadii Stepanov)
ff530a2093c294a1093e1b00fb66ab0a98851c04 qt: Use GUIUtil::ThemedLabel class (Hennadii Stepanov)
d99ef327a885874fed1c4e35e0f47b10290c6bd9 qt: Add GUIUtil::ThemedLabel class (Hennadii Stepanov)
c054720e08b5549913f54b9b4bc4e4002617ff23 qt: Make SignVerifyMessageDialog aware of runtime palette change (Hennadii Stepanov)
0dcc3fac433b341eb6e1d3a2fb4d2de1595e8e88 qt: Make SendCoinsEntry aware of runtime palette change (Hennadii Stepanov)
fa18d28e1242c2948814df1082ee12c2fecf5403 qt: Make RPCConsole aware of runtime palette change (Hennadii Stepanov)
f1083826e3e68803da86af6efba21c4080769b5c qt: Make BitcoinGUI aware of runtime palette change (Hennadii Stepanov)
ce17861dc419b0d1fc1d933000f484dd08bacf5b qt: Make PlatformStyle aware of runtime palette change (Hennadii Stepanov)

Pull request description:

  On macOS switching appearance (Light -> Dark or Dark -> Light) when Bitcoin Core is running makes the GUI pretty unusable.
  This bug is especially important when a user chose the "Auto" mode to adjust appearance automatically.

  This PR fixes Bitcoin Core behavior.

  This is an alternative to #268.

ACKs for top commit:
  Sjors:
    tACK c231254a65d390a3350fcef456d57e4a6eca0506 on macOS 11.4
  goums:
    ACK c231254a65d390a3350fcef456d57e4a6eca0506
  promag:
    Tested ACK c231254a65d390a3350fcef456d57e4a6eca0506 on macOS Big Sur arm64.
  jarolrod:
    tACK c231254a65d390a3350fcef456d57e4a6eca0506

Tree-SHA512: 122dda3e4c9703f68cec60613c536ca59d04c93f2c03398559f2361b8d279ae534800e8e677d94a33e10e769d00be54295a704e98afa2e986a06146b9f164854

1 files changed, 24 insertions, 1 deletions

diff --git a/src/qt/guiutil.h b/src/qt/guiutil.h
index 9c2ad74e1e..06a3b63668 100644
--- a/src/qt/guiutil.h
+++ b/src/qt/guiutil.h
@@ -27,6 +27,7 @@
 #include <chrono>
 #include <utility>
 
+class PlatformStyle;
 class QValidatedLineEdit;
 class SendCoinsRecipient;
 
@@ -231,10 +232,32 @@ namespace GUIUtil
 
     qreal calculateIdealFontSize(int width, const QString& text, QFont font, qreal minPointSize = 4, qreal startPointSize = 14);
 
-    class ClickableLabel : public QLabel
+    class ThemedLabel : public QLabel
     {
         Q_OBJECT
 
+    public:
+        explicit ThemedLabel(const PlatformStyle* platform_style, QWidget* parent = nullptr);
+        void setThemedPixmap(const QString& image_filename, int width, int height);
+
+    protected:
+        void changeEvent(QEvent* e) override;
+
+    private:
+        const PlatformStyle* m_platform_style;
+        QString m_image_filename;
+        int m_pixmap_width;
+        int m_pixmap_height;
+        void updateThemedPixmap();
+    };
+
+    class ClickableLabel : public ThemedLabel
+    {
+        Q_OBJECT
+
+    public:
+        explicit ClickableLabel(const PlatformStyle* platform_style, QWidget* parent = nullptr);
+
     Q_SIGNALS:
         /** Emitted when the label is clicked. The relative mouse coordinates of the click are
          * passed to the signal.