frontend: Add icon recoloring to state style event filter

shared/qt/idian/include/Idian/StateEventFilter.cpp

@@ -2,7 +2,7 @@
 #include <Idian/Utils.hpp>
 
 #include <QAbstractButton>
-#include <QLabel>
+#include <QStyleOptionButton>
 
 namespace idian {
 StateEventFilter::StateEventFilter(idian::Utils *utils, QWidget *target) : QObject(target), target(target), utils(utils)
@@ -22,7 +22,16 @@ bool StateEventFilter::eventFilter(QObject *obj, QEvent *event)
 	QWidget *widget = qobject_cast<QWidget *>(obj);
 	QFocusEvent *focusEvent = nullptr;
 
+	bool updateIconColors = true;
+
 	switch (event->type()) {
+	case QEvent::StyleChange:
+	case QEvent::ThemeChange:
+		utils->repolish(widget);
+
+		utils->polishChildren(widget);
+
+		break;
 	case QEvent::FocusIn:
 		utils->toggleClass(widget, "focus", true);
 
@@ -34,6 +43,7 @@ bool StateEventFilter::eventFilter(QObject *obj, QEvent *event)
 		}
 
 		utils->polishChildren(widget);
+
 		break;
 	case QEvent::FocusOut:
 		utils->toggleClass(widget, "focus", false);
@@ -44,8 +54,8 @@ bool StateEventFilter::eventFilter(QObject *obj, QEvent *event)
 			utils->polishChildren(widget);
 		}
 
-		break;
-	case QEvent::MouseButtonPress:
+		utils->polishChildren(widget);
+
 		break;
 	case QEvent::HoverEnter:
 		if (widget->isEnabled()) {
@@ -53,18 +63,28 @@ bool StateEventFilter::eventFilter(QObject *obj, QEvent *event)
 		}
 
 		utils->polishChildren(widget);
+
 		break;
 	case QEvent::HoverLeave:
 		utils->toggleClass(widget, "hover", false);
 
 		utils->polishChildren(widget);
+
 		break;
 	case QEvent::EnabledChange:
-		bool widgetEnabled = widget->isEnabled();
-		utils->toggleClass(widget, "disabled", !widgetEnabled);
+		utils->toggleClass(widget, "disabled", !widget->isEnabled());
 
 		utils->polishChildren(widget);
+
 		break;
+	default:
+		updateIconColors = false;
+		break;
+	}
+
+	if (updateIconColors) {
+		// Delay icon update
+		QTimer::singleShot(0, this, [this, widget]() { utils->applyColorToIcon(widget); });
 	}
 
 	return QObject::eventFilter(obj, event);

shared/qt/idian/include/Idian/StateEventFilter.hpp

@@ -3,8 +3,6 @@
 #include <Idian/Utils.hpp>
 
 #include <QWidget>
-#include <QAbstractbutton>
-#include <QStyleOptionButton>
 
 namespace idian {
 class StateEventFilter : public QObject {
@@ -21,5 +19,7 @@ public slots:
 private:
 	Utils *utils;
 	QWidget *target;
+
+	void applyColorToIcon();
 };
 } // namespace idian

shared/qt/idian/include/Idian/Utils.hpp

@@ -17,10 +17,13 @@
 
 #pragma once
 
+#include <QAbstractButton>
 #include <QFocusEvent>
 #include <QPainter>
 #include <QRegularExpression>
 #include <QStyle>
+#include <QStyleOptionButton>
+#include <QTimer>
 #include <QWidget>
 
 namespace idian {
@@ -125,6 +128,34 @@ public:
 		}
 	}
 
+	static void applyColorToIcon(QWidget *widget)
+	{
+		QAbstractButton *button = qobject_cast<QAbstractButton *>(widget);
+		if (button && !button->icon().isNull()) {
+			// Filter is on a widget with an icon set, update it's colors
+			QStyleOptionButton opt;
+			opt.initFrom(button);
+
+			QColor color = opt.palette.color(QPalette::ButtonText);
+			QPixmap tinted = recolorPixmap(button->icon().pixmap(button->iconSize(), QIcon::Normal), color);
+			QIcon tintedIcon;
+			tintedIcon.addPixmap(tinted, QIcon::Normal);
+			tintedIcon.addPixmap(tinted, QIcon::Disabled);
+
+			button->setIcon(tintedIcon);
+		}
+	}
+
+	static QPixmap recolorPixmap(const QPixmap &src, const QColor &color)
+	{
+		QImage img = src.toImage();
+		QPainter p(&img);
+		p.setCompositionMode(QPainter::CompositionMode_SourceIn);
+		p.fillRect(img.rect(), color);
+		p.end();
+		return QPixmap::fromImage(img);
+	}
+
 	void applyStateStylingEventFilter(QWidget *widget);
 };