Add file type filtering to File view.

Fixes issue #361
Thanks to: tyler.s.rhodes@gmail.com

data/data.qrc

@@ -323,5 +323,7 @@
         <file>icons/22x22/task-complete.png</file>
         <file>icons/22x22/task-reject.png</file>
         <file>schema/schema-34.sql</file>
+        <file>icons/22x22/audio-x-generic.png</file>
+        <file>icons/22x22/audio-x-disabled.png</file>
     </qresource>
 </RCC>

src/widgets/fileview.cpp

@@ -21,6 +21,7 @@
 #include "core/filesystemmusicstorage.h"
 #include "core/mimedata.h"
 #include "ui/iconloader.h"
+#include "ui/mainwindow.h" // for filter information
 #include "ui/organiseerrordialog.h"
 
 #include <QKeyEvent>
@@ -43,12 +44,16 @@ FileView::FileView(QWidget* parent)
   ui_->forward->setIcon(IconLoader::Load("go-next"));
   ui_->home->setIcon(IconLoader::Load("go-home"));
   ui_->up->setIcon(IconLoader::Load("go-up"));
+  QIcon toggle_icon(IconLoader::Load("audio-x-disabled"));
+  toggle_icon.addPixmap(IconLoader::Load("audio-x-generic").pixmap(22), QIcon::Normal, QIcon::On);
+  ui_->toggle_filter->setIcon(toggle_icon);
 
   connect(ui_->back, SIGNAL(clicked()), undo_stack_, SLOT(undo()));
   connect(ui_->forward, SIGNAL(clicked()), undo_stack_, SLOT(redo()));
   connect(ui_->home, SIGNAL(clicked()), SLOT(FileHome()));
   connect(ui_->up, SIGNAL(clicked()), SLOT(FileUp()));
   connect(ui_->path, SIGNAL(textChanged(QString)), SLOT(ChangeFilePath(QString)));
+  connect(ui_->toggle_filter, SIGNAL(clicked()), SLOT(ToggleFilter()));
 
   connect(undo_stack_, SIGNAL(canUndoChanged(bool)), ui_->back, SLOT(setEnabled(bool)));
   connect(undo_stack_, SIGNAL(canRedoChanged(bool)), ui_->forward, SLOT(setEnabled(bool)));
@@ -60,6 +65,12 @@ FileView::FileView(QWidget* parent)
   connect(ui_->list, SIGNAL(MoveToLibrary(QList<QUrl>)), SIGNAL(MoveToLibrary(QList<QUrl>)));
   connect(ui_->list, SIGNAL(CopyToDevice(QList<QUrl>)), SIGNAL(CopyToDevice(QList<QUrl>)));
   connect(ui_->list, SIGNAL(Delete(QStringList)), SLOT(Delete(QStringList)));
+
+  QString filter(MainWindow::kMusicFilterSpec);
+  // filter list strings are formatted as such: 'text (filters separated by spaces)'
+  filter.replace(QRegExp(".*[(]"), "");
+  filter.replace(QRegExp("[)].*"), "");
+  filter_list_ = filter.split(" ");
 }
 
 FileView::~FileView() {
@@ -99,6 +110,14 @@ void FileView::FileHome() {
   ChangeFilePath(QDir::homePath());
 }
 
+void FileView::ToggleFilter() {
+  if(ui_->toggle_filter->isChecked()) {
+    model_->setNameFilters(filter_list_);
+  } else {
+    model_->setNameFilters(QStringList("*"));
+  }
+}
+
 void FileView::ChangeFilePath(const QString& new_path_native) {
   QString new_path = QDir::fromNativeSeparators(new_path_native);
 
@@ -200,6 +219,11 @@ void FileView::showEvent(QShowEvent* e) {
     return;
 
   model_ = new QFileSystemModel(this);
+  
+  model_->setNameFilters(QStringList("*"));
+  // if an item fails the filter, hide it
+  model_->setNameFilterDisables(false);
+
   ui_->list->setModel(model_);
   ChangeFilePathWithoutUndo(QDir::homePath());
 

src/widgets/fileview.h

@@ -59,6 +59,7 @@ class FileView : public QWidget {
  private slots:
   void FileUp();
   void FileHome();
+  void ToggleFilter();
   void ChangeFilePath(const QString& new_path);
   void ItemActivated(const QModelIndex& index);
   void ItemDoubleClick(const QModelIndex& index);
@@ -102,6 +103,8 @@ class FileView : public QWidget {
   boost::shared_ptr<MusicStorage> storage_;
 
   QString lazy_set_path_;
+
+  QStringList filter_list_;
 };
 
 #endif // FILEVIEW_H

src/widgets/fileview.ui

@@ -86,6 +86,25 @@
      <item>
       <widget class="QLineEdit" name="path"/>
      </item>
+     <item>
+      <widget class="QToolButton" name="toggle_filter">
+       <property name="enabled">
+        <bool>true</bool>
+       </property>
+       <property name="iconSize">
+        <size>
+         <width>16</width>
+         <height>16</height>
+        </size>
+       </property>
+       <property name="checkable">
+        <bool>true</bool>
+       </property>
+       <property name="autoRaise">
+        <bool>false</bool>
+       </property>
+      </widget>
+     </item>
     </layout>
    </item>
    <item>