From f726b0d90ba5c586425e4e8e5c08421e97997720 Mon Sep 17 00:00:00 2001
From: Henning Gruendl <henning.gruendl@qt.io>
Date: Mon, 13 Jul 2020 17:17:39 +0200
Subject: [PATCH] QmlDesigner: Enable modes/states with icon font

Add functionality to use modes and states when generating a QIcon
from a font in StyleHelper

Task-number: QDS-2558
Change-Id: I764e8434a645d0984c6104cd1868fd5b0091d225
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
---
 src/libs/utils/stylehelper.cpp | 35 ++++++++++++++++++++++++++++++++++
 src/libs/utils/stylehelper.h   | 30 +++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+)

diff --git a/src/libs/utils/stylehelper.cpp b/src/libs/utils/stylehelper.cpp
index 6f8868cc7b2..4b317116c42 100644
--- a/src/libs/utils/stylehelper.cpp
+++ b/src/libs/utils/stylehelper.cpp
@@ -546,6 +546,41 @@ QLinearGradient StyleHelper::statusBarGradient(const QRect &statusBarRect)
     return grad;
 }
 
+QIcon StyleHelper::getIconFromIconFont(const QString &fontName, const QList<IconFontHelper> &parameters)
+{
+    QFontDatabase a;
+
+    QTC_ASSERT(a.hasFamily(fontName), {});
+
+    if (!a.hasFamily(fontName))
+        return {};
+
+    QIcon icon;
+
+    for (const IconFontHelper &p : parameters) {
+        const int maxDpr = qRound(qApp->devicePixelRatio());
+        for (int dpr = 1; dpr <= maxDpr; dpr++) {
+            QPixmap pixmap(p.size() * dpr);
+            pixmap.setDevicePixelRatio(dpr);
+            pixmap.fill(Qt::transparent);
+
+            QFont font(fontName);
+            font.setPixelSize(p.size().height());
+
+            QPainter painter(&pixmap);
+            painter.save();
+            painter.setPen(p.color());
+            painter.setFont(font);
+            painter.drawText(QRectF(QPoint(0, 0), p.size()), p.iconSymbol());
+            painter.restore();
+
+            icon.addPixmap(pixmap, p.mode(), p.state());
+        }
+    }
+
+    return icon;
+}
+
 QIcon StyleHelper::getIconFromIconFont(const QString &fontName, const QString &iconSymbol, int fontSize, int iconSize, QColor color)
 {
     QFontDatabase a;
diff --git a/src/libs/utils/stylehelper.h b/src/libs/utils/stylehelper.h
index 09f32534352..a1a24a8d5b5 100644
--- a/src/libs/utils/stylehelper.h
+++ b/src/libs/utils/stylehelper.h
@@ -93,6 +93,36 @@ public:
     static void tintImage(QImage &img, const QColor &tintColor);
     static QLinearGradient statusBarGradient(const QRect &statusBarRect);
 
+    class IconFontHelper
+    {
+        public:
+            IconFontHelper(const QString &iconSymbol,
+                           const QColor &color,
+                           const QSize &size,
+                           QIcon::Mode mode = QIcon::Normal,
+                           QIcon::State state = QIcon::Off)
+                : m_iconSymbol(iconSymbol)
+                , m_color(color)
+                , m_size(size)
+                , m_mode(mode)
+                , m_state(state)
+            {}
+
+            QString iconSymbol() const { return m_iconSymbol; }
+            QColor color() const { return m_color; }
+            QSize size() const { return m_size; }
+            QIcon::Mode mode() const { return m_mode; }
+            QIcon::State state() const { return m_state; }
+
+        private:
+            QString m_iconSymbol;
+            QColor m_color;
+            QSize m_size;
+            QIcon::Mode m_mode;
+            QIcon::State m_state;
+    };
+
+    static QIcon getIconFromIconFont(const QString &fontName, const QList<IconFontHelper> &parameters);
     static QIcon getIconFromIconFont(const QString &fontName, const QString &iconSymbol, int fontSize, int iconSize, QColor color);
     static QIcon getIconFromIconFont(const QString &fontName, const QString &iconSymbol, int fontSize, int iconSize);