Fixes: Improved file icons

Details:
This patch makes use of system icons as a base
and draws overlay on top. This should blend a bit better
into the native icon theme.

src/plugins/coreplugin/fileiconprovider.cpp

@@ -32,6 +32,9 @@
 ***************************************************************************/
 
 #include "fileiconprovider.h"
+#include <QtGui/QApplication>
+#include <QtGui/QStyle>
+#include <QtGui/QPainter>
 
 using namespace Core;
 
@@ -48,7 +51,7 @@ using namespace Core;
 FileIconProvider *FileIconProvider::m_instance = 0;
 
 FileIconProvider::FileIconProvider()
-    : m_unknownFileIcon(QLatin1String(":/core/images/unknownfile.png"))
+    : m_unknownFileIcon(qApp->style()->standardIcon(QStyle::SP_FileIcon))
 {
 }
 
@@ -76,7 +79,7 @@ QIcon FileIconProvider::icon(const QFileInfo &fileInfo)
         // same suffix (Mac OS X), but should speed up the retrieval a lot ...
         icon = m_systemIconProvider.icon(fileInfo);
         if (!suffix.isEmpty())
-            registerIconForSuffix(icon, suffix);
+            registerIconOverlayForSuffix(icon, suffix);
 #else
         if (fileInfo.isDir()) {
             icon = m_systemIconProvider.icon(fileInfo);
@@ -89,11 +92,22 @@ QIcon FileIconProvider::icon(const QFileInfo &fileInfo)
     return icon;
 }
 
+// Creates a pixmap with baseicon at size and overlayous overlayIcon over it.
+QPixmap FileIconProvider::overlayIcon(QStyle::StandardPixmap baseIcon, const QIcon &overlayIcon, const QSize &size) const
+{
+    QPixmap iconPixmap = qApp->style()->standardIcon(baseIcon).pixmap(size);
+    QPainter painter(&iconPixmap);
+    painter.drawPixmap(0, 0, overlayIcon.pixmap(size));
+    painter.end();
+    return iconPixmap;
+}
+
 /*!
-  Registers an icon for a given suffix, overriding any existing icon.
+  Registers an icon for a given suffix, overlaying the system file icon
   */
-void FileIconProvider::registerIconForSuffix(const QIcon &icon, const QString &suffix)
+void FileIconProvider::registerIconOverlayForSuffix(const QIcon &icon, const QString &suffix)
 {
+    QPixmap fileIconPixmap = overlayIcon(QStyle::SP_FileIcon, icon, QSize(16, 16));
     // delete old icon, if it exists
     QList<QPair<QString,QIcon> >::iterator iter = m_cache.begin();
     for (; iter != m_cache.end(); ++iter) {
@@ -103,7 +117,7 @@ void FileIconProvider::registerIconForSuffix(const QIcon &icon, const QString &s
         }
     }
 
-    QPair<QString,QIcon> newEntry(suffix, icon);
+    QPair<QString,QIcon> newEntry(suffix, fileIconPixmap);
     m_cache.append(newEntry);
 }
 

src/plugins/coreplugin/fileiconprovider.h

@@ -40,6 +40,7 @@
 #include <QtCore/QPair>
 #include <QtGui/QFileIconProvider>
 #include <QtGui/QIcon>
+#include <QtGui/QStyle>
 
 namespace Core {
 
@@ -48,7 +49,8 @@ public:
     ~FileIconProvider(); // used to clear the cache
     QIcon icon(const QFileInfo &fileInfo);
 
-    void registerIconForSuffix(const QIcon &icon, const QString &suffix);
+    QPixmap overlayIcon(QStyle::StandardPixmap baseIcon, const QIcon &overlayIcon, const QSize &size) const;
+    void registerIconOverlayForSuffix(const QIcon &icon, const QString &suffix);
 
     static FileIconProvider *instance();
 

src/plugins/cppeditor/cppplugin.cpp

@@ -75,9 +75,9 @@ CppPluginEditorFactory::CppPluginEditorFactory(CppPlugin *owner) :
         << QLatin1String(CppEditor::Constants::CPP_SOURCE_MIMETYPE)
         << QLatin1String(CppEditor::Constants::CPP_HEADER_MIMETYPE);
     Core::FileIconProvider *iconProvider = Core::FileIconProvider::instance();
-    iconProvider->registerIconForSuffix(QIcon(":/cppeditor/images/qt_cpp.png"),
+    iconProvider->registerIconOverlayForSuffix(QIcon(":/cppeditor/images/qt_cpp.png"),
                                         QLatin1String("cpp"));
-    iconProvider->registerIconForSuffix(QIcon(":/cppeditor/images/qt_h.png"),
+    iconProvider->registerIconOverlayForSuffix(QIcon(":/cppeditor/images/qt_h.png"),
                                         QLatin1String("h"));
 }
 

src/plugins/designer/formeditorfactory.cpp

@@ -52,7 +52,7 @@ FormEditorFactory::FormEditorFactory()
     m_mimeTypes(QLatin1String(FORM_MIMETYPE))
 {
     Core::FileIconProvider *iconProvider = Core::FileIconProvider::instance();
-    iconProvider->registerIconForSuffix(QIcon(":/formeditor/images/qt_ui.png"),
+    iconProvider->registerIconOverlayForSuffix(QIcon(":/formeditor/images/qt_ui.png"),
                                         QLatin1String("ui"));
 }
 

src/plugins/qt4projectmanager/profileeditorfactory.cpp

@@ -56,9 +56,9 @@ ProFileEditorFactory::ProFileEditorFactory(Qt4Manager *manager, TextEditor::Text
     m_actionHandler(handler)
 {
     Core::FileIconProvider *iconProvider = Core::FileIconProvider::instance();
-    iconProvider->registerIconForSuffix(QIcon(":/qt4projectmanager/images/qt_project.png"),
+    iconProvider->registerIconOverlayForSuffix(QIcon(":/qt4projectmanager/images/qt_project.png"),
                                         QLatin1String("pro"));
-    iconProvider->registerIconForSuffix(QIcon(":/qt4projectmanager/images/qt_project.png"),
+    iconProvider->registerIconOverlayForSuffix(QIcon(":/qt4projectmanager/images/qt_project.png"),
                                         QLatin1String("pri"));
 }
 

src/plugins/qt4projectmanager/qt4nodes.cpp

@@ -43,6 +43,7 @@
 #include <projectexplorer/nodesvisitor.h>
 
 #include <coreplugin/editormanager/editormanager.h>
+#include <coreplugin/fileiconprovider.h>
 #include <coreplugin/filemanager.h>
 #include <coreplugin/icore.h>
 #include <coreplugin/iversioncontrol.h>
@@ -60,6 +61,7 @@
 #include <QtCore/QFileInfo>
 #include <QtCore/QTimer>
 
+#include <QtGui/QPainter>
 #include <QtGui/QMainWindow>
 #include <QtGui/QMessageBox>
 #include <QtGui/QPushButton>
@@ -94,7 +96,17 @@ Qt4PriFileNode::Qt4PriFileNode(Qt4Project *project, Qt4ProFileNode* qt4ProFileNo
 {
     Q_ASSERT(project);
     setFolderName(QFileInfo(filePath).baseName());
-    setIcon(QIcon(":/qt4projectmanager/images/qt_project.png"));
+
+    static QIcon dirIcon;
+    if (dirIcon.isNull()) {
+        // Create a custom Qt dir icon based on the system icon
+        Core::FileIconProvider *iconProvider = Core::FileIconProvider::instance();
+        QPixmap dirIconPixmap = iconProvider->overlayIcon(QStyle::SP_DirIcon,
+                                                          QIcon(":/qt4projectmanager/images/qt_project.png"),
+                                                          QSize(16, 16));
+        dirIcon.addPixmap(dirIconPixmap);
+    }
+    setIcon(dirIcon);
     m_fileWatcher->addFile(filePath);
     connect(m_fileWatcher, SIGNAL(fileChanged(QString)),
             this, SLOT(scheduleUpdate()));

src/plugins/resourceeditor/resourceeditorfactory.cpp

@@ -55,8 +55,8 @@ ResourceEditorFactory::ResourceEditorFactory(ResourceEditorPlugin *plugin) :
     m_context += Core::UniqueIDManager::instance()
                  ->uniqueIdentifier(QLatin1String(ResourceEditor::Constants::C_RESOURCEEDITOR));
     Core::FileIconProvider *iconProvider = Core::FileIconProvider::instance();
-    iconProvider->registerIconForSuffix(QIcon(":/resourceeditor/images/qt_qrc.png"),
-                                        QLatin1String("qrc"));
+    iconProvider->registerIconOverlayForSuffix(QIcon(":/resourceeditor/images/qt_qrc.png"),
+                                               QLatin1String("qrc"));
 }
 
 QString ResourceEditorFactory::kind() const