Allow to customize ProgressBar color

PR #22928.

src/gui/progressbarpainter.cpp

@@ -1,5 +1,6 @@
 /*
  * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2025  Vladimir Golovnev <glassez@yandex.ru>
  * Copyright (C) 2020  Prince Gupta <jagannatharjun11@gmail.com>
  *
  * This program is free software; you can redistribute it and/or
@@ -38,14 +39,19 @@
 #endif
 
 #include "base/global.h"
+#include "gui/uithememanager.h"
 
-ProgressBarPainter::ProgressBarPainter()
+ProgressBarPainter::ProgressBarPainter(QObject *parent)
+    : QObject(parent)
 {
 #if (defined(Q_OS_WIN) || defined(Q_OS_MACOS))
-    auto *fusionStyle = new QProxyStyle {u"fusion"_s};
+    auto *fusionStyle = new QProxyStyle(u"fusion"_s);
     fusionStyle->setParent(&m_dummyProgressBar);
     m_dummyProgressBar.setStyle(fusionStyle);
 #endif
+
+    applyUITheme();
+    connect(UIThemeManager::instance(), &UIThemeManager::themeChanged, this, &ProgressBarPainter::applyUITheme);
 }
 
 void ProgressBarPainter::paint(QPainter *painter, const QStyleOptionViewItem &option, const QString &text, const int progress) const
@@ -66,9 +72,17 @@ void ProgressBarPainter::paint(QPainter *painter, const QStyleOptionViewItem &op
     const bool isEnabled = option.state.testFlag(QStyle::State_Enabled);
     styleOption.palette.setCurrentColorGroup(isEnabled ? QPalette::Active : QPalette::Disabled);
 
+    if (m_chunkColor.isValid())
+        styleOption.palette.setColor(QPalette::Highlight, m_chunkColor);
+
     painter->save();
     const QStyle *style = m_dummyProgressBar.style();
     style->drawPrimitive(QStyle::PE_PanelItemViewItem, &option, painter, option.widget);
     style->drawControl(QStyle::CE_ProgressBar, &styleOption, painter, &m_dummyProgressBar);
     painter->restore();
 }
+
+void ProgressBarPainter::applyUITheme()
+{
+    m_chunkColor = UIThemeManager::instance()->getColor(u"ProgressBar"_s);
+}

src/gui/progressbarpainter.h

@@ -1,5 +1,6 @@
 /*
  * Bittorrent Client using Qt and libtorrent.
+ * Copyright (C) 2025  Vladimir Golovnev <glassez@yandex.ru>
  * Copyright (C) 2020  Prince Gupta <jagannatharjun11@gmail.com>
  *
  * This program is free software; you can redistribute it and/or
@@ -28,18 +29,26 @@
 
 #pragma once
 
+#include <QColor>
+#include <QObject>
 #include <QProgressBar>
 
 class QStyleOptionViewItem;
 
-class ProgressBarPainter
+class ProgressBarPainter : public QObject
 {
+    Q_OBJECT
+    Q_DISABLE_COPY_MOVE(ProgressBarPainter)
+
 public:
-    ProgressBarPainter();
+    explicit ProgressBarPainter(QObject *parent = nullptr);
 
     void paint(QPainter *painter, const QStyleOptionViewItem &option, const QString &text, int progress) const;
 
 private:
+    void applyUITheme();
+
+    QColor m_chunkColor;
     // for painting progressbar with stylesheet option, a dummy progress bar is required
     QProgressBar m_dummyProgressBar;
 };

src/gui/uithemecommon.h

@@ -85,7 +85,9 @@ inline QHash<QString, UIThemeColor> defaultUIThemeColors()
         {u"PiecesBar.Border"_s, {{}, {}}},
         {u"PiecesBar.Piece"_s, {{}, {}}},
         {u"PiecesBar.PartialPiece"_s, {{}, {}}},
-        {u"PiecesBar.MissingPiece"_s, {{}, {}}}
+        {u"PiecesBar.MissingPiece"_s, {{}, {}}},
+
+        {u"ProgressBar"_s, {{}, {}}}
     };
 }
 

src/gui/uithemedialog.cpp

@@ -28,6 +28,7 @@
 
 #include "uithemedialog.h"
 
+#include <QtSystemDetection>
 #include <QColor>
 #include <QColorDialog>
 #include <QFileDialog>
@@ -233,6 +234,10 @@ UIThemeDialog::UIThemeDialog(QWidget *parent)
 {
     m_ui->setupUi(this);
 
+#if (defined(Q_OS_WIN) || defined(Q_OS_MACOS))
+    m_ui->colorsWarningLabel->hide();
+#endif
+
     connect(m_ui->buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
     connect(m_ui->buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
 

src/gui/uithemedialog.ui

@@ -72,6 +72,21 @@
            </rect>
           </property>
           <layout class="QVBoxLayout" name="verticalLayout_3">
+           <item>
+            <widget class="QLabel" name="colorsWarningLabel">
+             <property name="text">
+              <string>Note that some custom colors may not be applied in some desktop environments.</string>
+             </property>
+             <property name="wordWrap">
+              <bool>true</bool>
+             </property>
+             <property name="font">
+              <font>
+               <italic>true</italic>
+              </font>
+             </property>
+            </widget>
+           </item>
            <item>
             <layout class="QGridLayout" name="colorsLayout" columnstretch="1,0,0,0,0" columnminimumwidth="0,15,0,15,0">
              <item row="0" column="0">