GH-378 add basic custom theme support

Files you can customize are created in themes/custom/

14 files changed, 328 insertions, 33 deletions

diff --git a/application/CMakeLists.txt b/application/CMakeLists.txt
index 5ac7001d..f89de0cb 100644
--- a/application/CMakeLists.txt
+++ b/application/CMakeLists.txt
@@ -111,8 +111,11 @@ SET(MULTIMC_SOURCES
 	themes/FusionTheme.h
 	themes/BrightTheme.cpp
 	themes/BrightTheme.h
+	themes/CustomTheme.cpp
+	themes/CustomTheme.h
 	themes/DarkTheme.cpp
 	themes/DarkTheme.h
+	themes/ITheme.cpp
 	themes/ITheme.h
 	themes/SystemTheme.cpp
 	themes/SystemTheme.h
diff --git a/application/MultiMC.cpp b/application/MultiMC.cpp
index 969e54e5..9ccd0895 100644
--- a/application/MultiMC.cpp
+++ b/application/MultiMC.cpp
@@ -15,6 +15,7 @@
 #include "themes/SystemTheme.h"
 #include "themes/DarkTheme.h"
 #include "themes/BrightTheme.h"
+#include "themes/CustomTheme.h"
 
 #include <iostream>
 #include <QDir>
@@ -1010,9 +1011,11 @@ void MultiMC::initThemes()
 	{
 		m_themes.insert(std::make_pair(theme->id(), std::unique_ptr<ITheme>(theme)));
 	};
+	auto darkTheme = new DarkTheme();
 	insertTheme(new SystemTheme());
-	insertTheme(new DarkTheme());
+	insertTheme(darkTheme);
 	insertTheme(new BrightTheme());
+	insertTheme(new CustomTheme(darkTheme, "custom"));
 }
 
 void MultiMC::setApplicationTheme(const QString& name)
diff --git a/application/themes/BrightTheme.cpp b/application/themes/BrightTheme.cpp
index 83d8f0b2..a7cfa010 100644
--- a/application/themes/BrightTheme.cpp
+++ b/application/themes/BrightTheme.cpp
@@ -26,9 +26,18 @@ QPalette BrightTheme::colorScheme()
 	brightPalette.setColor(QPalette::Link, QColor(41, 128, 185));
 	brightPalette.setColor(QPalette::Highlight, QColor(61, 174, 233));
 	brightPalette.setColor(QPalette::HighlightedText, QColor(239,240,241));
-	return fadeInactive(brightPalette, 0.5f,  QColor(239,240,241));
+	return fadeInactive(brightPalette, fadeAmount(), fadeColor());
 }
 
+double BrightTheme::fadeAmount()
+{
+	return 0.5;
+}
+
+QColor BrightTheme::fadeColor()
+{
+	return QColor(239,240,241);
+}
 
 QString BrightTheme::appStyleSheet()
 {
diff --git a/application/themes/BrightTheme.h b/application/themes/BrightTheme.h
index 85b7041b..814aa6de 100644
--- a/application/themes/BrightTheme.h
+++ b/application/themes/BrightTheme.h
@@ -11,5 +11,7 @@ public:
 	QString name() override;
 	QString appStyleSheet() override;
 	QPalette colorScheme() override;
+	double fadeAmount() override;
+	QColor fadeColor() override;
 };
 
diff --git a/application/themes/CustomTheme.cpp b/application/themes/CustomTheme.cpp
new file mode 100644
index 00000000..a3141573
--- /dev/null
+++ b/application/themes/CustomTheme.cpp
@@ -0,0 +1,227 @@
+#include "CustomTheme.h"
+#include <QDir>
+#include <Json.h>
+#include <FileSystem.h>
+
+const char * themeFile = "theme.json";
+const char * styleFile = "themeStyle.css";
+
+static bool readThemeJson(const QString &path, QPalette &palette, double &fadeAmount, QColor &fadeColor, QString &name, QString &widgets)
+{
+	QFileInfo pathInfo(path);
+	if(pathInfo.exists() && pathInfo.isFile())
+	{
+		try
+		{
+			auto doc = Json::requireDocument(path, "Theme JSON file");
+			const QJsonObject root = doc.object();
+			name = Json::requireString(root, "name", "Theme name");
+			widgets = Json::requireString(root, "widgets", "Qt widget theme");
+			auto colorsRoot = Json::requireObject(root, "colors", "colors object");
+			auto readColor = [&](QString colorName) -> QColor
+			{
+				auto colorValue = Json::ensureString(colorsRoot, colorName, QString());
+				if(!colorValue.isEmpty())
+				{
+					QColor color(colorValue);
+					if(!color.isValid())
+					{
+						qWarning() << "Color value" << colorValue << "for" << colorName << "was not recognized.";
+						return QColor();
+					}
+					return color;
+				}
+				return QColor();
+			};
+			auto readAndSetColor = [&](QPalette::ColorRole role, QString colorName)
+			{
+				auto color = readColor(colorName);
+				if(color.isValid())
+				{
+					palette.setColor(role, color);
+				}
+				else
+				{
+					qDebug() << "Color value for" << colorName << "was not present.";
+				}
+			};
+
+			// palette
+			readAndSetColor(QPalette::Window, "Window");
+			readAndSetColor(QPalette::WindowText, "WindowText");
+			readAndSetColor(QPalette::Base, "Base");
+			readAndSetColor(QPalette::AlternateBase, "AlternateBase");
+			readAndSetColor(QPalette::ToolTipBase, "ToolTipBase");
+			readAndSetColor(QPalette::ToolTipText, "ToolTipText");
+			readAndSetColor(QPalette::Text, "Text");
+			readAndSetColor(QPalette::Button, "Button");
+			readAndSetColor(QPalette::ButtonText, "ButtonText");
+			readAndSetColor(QPalette::BrightText, "BrightText");
+			readAndSetColor(QPalette::Link, "Link");
+			readAndSetColor(QPalette::Highlight, "Highlight");
+			readAndSetColor(QPalette::HighlightedText, "HighlightedText");
+
+			//fade
+			fadeColor = readColor("fadeColor");
+			fadeAmount = Json::ensureDouble(colorsRoot, "fadeAmount", 0.5, "fade amount");
+
+		}
+		catch(Exception e)
+		{
+			qWarning() << "Couldn't load theme json: " << e.cause();
+			return false;
+		}
+	}
+	else
+	{
+		qDebug() << "No theme json present.";
+		return false;
+	}
+	return true;
+}
+
+static bool writeThemeJson(const QString &path, const QPalette &palette, double fadeAmount, QColor fadeColor, QString name, QString widgets)
+{
+	QJsonObject rootObj;
+	rootObj.insert("name", name);
+	rootObj.insert("widgets", widgets);
+
+	QJsonObject colorsObj;
+	auto insertColor = [&](QPalette::ColorRole role, QString colorName)
+	{
+		colorsObj.insert(colorName, palette.color(role).name());
+	};
+
+	// palette
+	insertColor(QPalette::Window, "Window");
+	insertColor(QPalette::WindowText, "WindowText");
+	insertColor(QPalette::Base, "Base");
+	insertColor(QPalette::AlternateBase, "AlternateBase");
+	insertColor(QPalette::ToolTipBase, "ToolTipBase");
+	insertColor(QPalette::ToolTipText, "ToolTipText");
+	insertColor(QPalette::Text, "Text");
+	insertColor(QPalette::Button, "Button");
+	insertColor(QPalette::ButtonText, "ButtonText");
+	insertColor(QPalette::BrightText, "BrightText");
+	insertColor(QPalette::Link, "Link");
+	insertColor(QPalette::Highlight, "Highlight");
+	insertColor(QPalette::HighlightedText, "HighlightedText");
+
+	// fade
+	colorsObj.insert("fadeColor", fadeColor.name());
+	colorsObj.insert("fadeAmount", fadeAmount);
+
+	rootObj.insert("colors", colorsObj);
+	try
+	{
+		Json::write(rootObj, path);
+		return true;
+	}
+	catch (Exception e)
+	{
+		qWarning() << "Failed to write theme json to" << path;
+		return false;
+	}
+}
+
+CustomTheme::CustomTheme(ITheme* baseTheme, QString folder)
+{
+	m_id = folder;
+	QString path = FS::PathCombine("themes", m_id);
+
+	qDebug() << "Loading theme" << m_id;
+
+	if(!FS::ensureFolderPathExists(path))
+	{
+		qWarning() << "couldn't create folder for theme!";
+		m_palette = baseTheme->colorScheme();
+		m_styleSheet = baseTheme->appStyleSheet();
+		return;
+	}
+
+	auto themeFilePath = FS::PathCombine(path, themeFile);
+
+	m_palette = baseTheme->colorScheme();
+	if (!readThemeJson(themeFilePath, m_palette, m_fadeAmount, m_fadeColor, m_name, m_widgets))
+	{
+		m_name = "Custom";
+		m_palette = baseTheme->colorScheme();
+		m_fadeColor = baseTheme->fadeColor();
+		m_fadeAmount = baseTheme->fadeAmount();
+		m_widgets = baseTheme->qtTheme();
+
+		QFileInfo info(themeFilePath);
+		if(!info.exists())
+		{
+			writeThemeJson(themeFilePath, m_palette, m_fadeAmount, m_fadeColor, "Custom", m_widgets);
+		}
+	}
+	else
+	{
+		m_palette = fadeInactive(m_palette, m_fadeAmount, m_fadeColor);
+	}
+
+	auto cssFilePath = FS::PathCombine(path, styleFile);
+	QFileInfo info (cssFilePath);
+	if(info.isFile())
+	{
+		try
+		{
+			// TODO: validate css?
+			m_styleSheet = QString::fromUtf8(FS::read(cssFilePath));
+		}
+		catch(Exception e)
+		{
+			qWarning() << "Couldn't load css:" << e.cause() << "from" << cssFilePath;
+			m_styleSheet = baseTheme->appStyleSheet();
+		}
+	}
+	else
+	{
+		qDebug() << "No theme css present.";
+		m_styleSheet = baseTheme->appStyleSheet();
+		try
+		{
+			FS::write(cssFilePath, m_styleSheet.toUtf8());
+		}
+		catch(Exception e)
+		{
+			qWarning() << "Couldn't write css:" << e.cause() << "to" << cssFilePath;
+		}
+	}
+}
+
+QString CustomTheme::id()
+{
+	return m_id;
+}
+
+QString CustomTheme::name()
+{
+	return m_name;
+}
+
+QPalette CustomTheme::colorScheme()
+{
+	return m_palette;
+}
+
+QString CustomTheme::appStyleSheet()
+{
+	return m_styleSheet;
+}
+
+double CustomTheme::fadeAmount()
+{
+	return m_fadeAmount;
+}
+
+QColor CustomTheme::fadeColor()
+{
+	return m_fadeColor;
+}
+
+QString CustomTheme::qtTheme()
+{
+	return m_widgets;
+}
diff --git a/application/themes/CustomTheme.h b/application/themes/CustomTheme.h
new file mode 100644
index 00000000..94cd10a5
--- /dev/null
+++ b/application/themes/CustomTheme.h
@@ -0,0 +1,28 @@
+#pragma once
+
+#include "ITheme.h"
+
+class CustomTheme: public ITheme
+{
+public:
+	CustomTheme(ITheme * baseTheme, QString folder);
+	virtual ~CustomTheme() {}
+
+	QString id() override;
+	QString name() override;
+	QString appStyleSheet() override;
+	QPalette colorScheme() override;
+	double fadeAmount() override;
+	QColor fadeColor() override;
+	QString qtTheme() override;
+
+private: /* data */
+	QPalette m_palette;
+	QColor m_fadeColor;
+	double m_fadeAmount;
+	QString m_styleSheet;
+	QString m_name;
+	QString m_id;
+	QString m_widgets;
+};
+
diff --git a/application/themes/DarkTheme.cpp b/application/themes/DarkTheme.cpp
index 143dd533..2bcb4cd7 100644
--- a/application/themes/DarkTheme.cpp
+++ b/application/themes/DarkTheme.cpp
@@ -26,9 +26,18 @@ QPalette DarkTheme::colorScheme()
 	darkPalette.setColor(QPalette::Link, QColor(42, 130, 218));
 	darkPalette.setColor(QPalette::Highlight, QColor(42, 130, 218));
 	darkPalette.setColor(QPalette::HighlightedText, Qt::black);
-	return fadeInactive(darkPalette, 0.5f,  QColor(49,54,59));
+	return fadeInactive(darkPalette, fadeAmount(),  fadeColor());
 }
 
+double DarkTheme::fadeAmount()
+{
+	return 0.5;
+}
+
+QColor DarkTheme::fadeColor()
+{
+	return QColor(49,54,59);
+}
 
 QString DarkTheme::appStyleSheet()
 {
diff --git a/application/themes/DarkTheme.h b/application/themes/DarkTheme.h
index a8c17de7..142f7860 100644
--- a/application/themes/DarkTheme.h
+++ b/application/themes/DarkTheme.h
@@ -11,4 +11,6 @@ public:
 	QString name() override;
 	QString appStyleSheet() override;
 	QPalette colorScheme() override;
+	double fadeAmount() override;
+	QColor fadeColor() override;
 };
diff --git a/application/themes/FusionTheme.cpp b/application/themes/FusionTheme.cpp
index fa2ccf64..aaf7b3d5 100644
--- a/application/themes/FusionTheme.cpp
+++ b/application/themes/FusionTheme.cpp
@@ -1,32 +1,6 @@
 #include "FusionTheme.h"
-#include "rainbow.h"
 
 QString FusionTheme::qtTheme()
 {
 	return "Fusion";
 }
-
-QPalette FusionTheme::fadeInactive(QPalette in, qreal bias, QColor color)
-{
-	auto blend = [&in, bias, color](QPalette::ColorRole role)
-	{
-		QColor from = in.color(QPalette::Active, role);
-		QColor blended = Rainbow::mix(from, color, bias);
-		in.setColor(QPalette::Disabled, role, blended);
-	};
-	blend(QPalette::Window);
-	blend(QPalette::WindowText);
-	blend(QPalette::Base);
-	blend(QPalette::AlternateBase);
-	blend(QPalette::ToolTipBase);
-	blend(QPalette::ToolTipText);
-	blend(QPalette::Text);
-	blend(QPalette::Button);
-	blend(QPalette::ButtonText);
-	blend(QPalette::BrightText);
-	blend(QPalette::Link);
-	blend(QPalette::Highlight);
-	blend(QPalette::HighlightedText);
-	return in;
-}
-
diff --git a/application/themes/FusionTheme.h b/application/themes/FusionTheme.h
index 2f938eb9..e2d9014c 100644
--- a/application/themes/FusionTheme.h
+++ b/application/themes/FusionTheme.h
@@ -8,7 +8,4 @@ public:
 	virtual ~FusionTheme() {}
 
 	QString qtTheme() override;
-
-protected:
-	QPalette fadeInactive(QPalette in, qreal bias, QColor color);
 };
diff --git a/application/themes/ITheme.cpp b/application/themes/ITheme.cpp
new file mode 100644
index 00000000..aefcc381
--- /dev/null
+++ b/application/themes/ITheme.cpp
@@ -0,0 +1,26 @@
+#include "ITheme.h"
+#include "rainbow.h"
+
+QPalette ITheme::fadeInactive(QPalette in, qreal bias, QColor color)
+{
+	auto blend = [&in, bias, color](QPalette::ColorRole role)
+	{
+		QColor from = in.color(QPalette::Active, role);
+		QColor blended = Rainbow::mix(from, color, bias);
+		in.setColor(QPalette::Disabled, role, blended);
+	};
+	blend(QPalette::Window);
+	blend(QPalette::WindowText);
+	blend(QPalette::Base);
+	blend(QPalette::AlternateBase);
+	blend(QPalette::ToolTipBase);
+	blend(QPalette::ToolTipText);
+	blend(QPalette::Text);
+	blend(QPalette::Button);
+	blend(QPalette::ButtonText);
+	blend(QPalette::BrightText);
+	blend(QPalette::Link);
+	blend(QPalette::Highlight);
+	blend(QPalette::HighlightedText);
+	return in;
+}
diff --git a/application/themes/ITheme.h b/application/themes/ITheme.h
index 969969be..9c071e0a 100644
--- a/application/themes/ITheme.h
+++ b/application/themes/ITheme.h
@@ -11,4 +11,8 @@ public:
 	virtual QString appStyleSheet() = 0;
 	virtual QString qtTheme() = 0;
 	virtual QPalette colorScheme() = 0;
+	virtual QColor fadeColor() = 0;
+	virtual double fadeAmount() = 0;
+
+	static QPalette fadeInactive(QPalette in, qreal bias, QColor color);
 };
diff --git a/application/themes/SystemTheme.cpp b/application/themes/SystemTheme.cpp
index 6d8a0ee8..f7a68061 100644
--- a/application/themes/SystemTheme.cpp
+++ b/application/themes/SystemTheme.cpp
@@ -47,3 +47,13 @@ QString SystemTheme::appStyleSheet()
 {
 	return QString();
 }
+
+double SystemTheme::fadeAmount()
+	{
+		return 0.5;
+	}
+
+QColor SystemTheme::fadeColor()
+	{
+		return QColor(128,128,128);
+	}
diff --git a/application/themes/SystemTheme.h b/application/themes/SystemTheme.h
index 75a8738c..e4a84bca 100644
--- a/application/themes/SystemTheme.h
+++ b/application/themes/SystemTheme.h
@@ -13,8 +13,9 @@ public:
 	QString qtTheme() override;
 	QString appStyleSheet() override;
 	QPalette colorScheme() override;
+	double fadeAmount() override;
+	QColor fadeColor() override;
 private:
 	QPalette systemPalette;
 	QString systemTheme;
 };
-