GH-1047 World management for instances. Removal only currently.

15 files changed, 750 insertions, 0 deletions

diff --git a/application/CMakeLists.txt b/application/CMakeLists.txt
index 1cc37a5d..f72b6a16 100644
--- a/application/CMakeLists.txt
+++ b/application/CMakeLists.txt
@@ -177,6 +177,8 @@ SET(MULTIMC_SOURCES
 	pages/LegacyJarModPage.h
 	pages/LegacyUpgradePage.cpp
 	pages/LegacyUpgradePage.h
+	pages/WorldListPage.cpp
+	pages/WorldListPage.h
 
 	# GUI - global settings pages
 	pages/global/AccountListPage.cpp
@@ -272,6 +274,7 @@ SET(MULTIMC_UIS
 	pages/OtherLogsPage.ui
 	pages/LegacyJarModPage.ui
 	pages/LegacyUpgradePage.ui
+	pages/WorldListPage.ui
 
 	# Global settings pages
 	pages/global/AccountListPage.ui
diff --git a/application/InstancePageProvider.h b/application/InstancePageProvider.h
index 1da4c9f1..c3ae17c1 100644
--- a/application/InstancePageProvider.h
+++ b/application/InstancePageProvider.h
@@ -12,6 +12,7 @@
 #include "pages/OtherLogsPage.h"
 #include "pages/BasePageProvider.h"
 #include "pages/LegacyJarModPage.h"
+#include "pages/WorldListPage.h"
 #include <pathutils.h>
 
 
@@ -39,6 +40,7 @@ public:
 			values.append(new ResourcePackPage(onesix.get()));
 			values.append(new TexturePackPage(onesix.get()));
 			values.append(new NotesPage(onesix.get()));
+			values.append(new WorldListPage(onesix.get(), onesix->worldList(), "worlds", "worlds", tr("Worlds"), "Worlds"));
 			values.append(new ScreenshotsPage(PathCombine(onesix->minecraftRoot(), "screenshots")));
 			values.append(new InstanceSettingsPage(onesix.get()));
 		}
@@ -54,6 +56,7 @@ public:
 			values.append(new ModFolderPage(legacy.get(), legacy->coreModList(), "coremods", "coremods", tr("Core mods"), "Loader-mods"));
 			values.append(new TexturePackPage(legacy.get()));
 			values.append(new NotesPage(legacy.get()));
+			values.append(new WorldListPage(legacy.get(), legacy->worldList(), "worlds", "worlds", tr("Worlds"), "Worlds"));
 			values.append(new ScreenshotsPage(PathCombine(legacy->minecraftRoot(), "screenshots")));
 			values.append(new InstanceSettingsPage(legacy.get()));
 		}
diff --git a/application/pages/WorldListPage.cpp b/application/pages/WorldListPage.cpp
new file mode 100644
index 00000000..662b7452
--- /dev/null
+++ b/application/pages/WorldListPage.cpp
@@ -0,0 +1,94 @@
+//
+// Created by robotbrain on 8/18/15.
+//
+
+#include "WorldListPage.h"
+#include "ui_WorldListPage.h"
+#include "minecraft/WorldList.h"
+#include "dialogs/ModEditDialogCommon.h"
+#include <QEvent>
+#include <QKeyEvent>
+
+WorldListPage::WorldListPage(BaseInstance *inst, std::shared_ptr<WorldList> worlds, QString id,
+							 QString iconName, QString displayName, QString helpPage,
+							 QWidget *parent)
+	: QWidget(parent), ui(new Ui::WorldListPage)
+{
+	ui->setupUi(this);
+	ui->tabWidget->tabBar()->hide();
+	m_inst = inst;
+	m_worlds = worlds;
+	m_id = id;
+	m_displayName = displayName;
+	m_iconName = iconName;
+	m_helpName = helpPage;
+	ui->worldTreeView->setModel(m_worlds.get());
+	ui->worldTreeView->installEventFilter(this);
+	auto smodel = ui->worldTreeView->selectionModel();
+	connect(smodel, SIGNAL(currentChanged(QModelIndex, QModelIndex)),
+			SLOT(modCurrent(QModelIndex, QModelIndex)));
+}
+
+void WorldListPage::opened()
+{
+	m_worlds->startWatching();
+}
+
+void WorldListPage::closed()
+{
+	m_worlds->stopWatching();
+}
+
+WorldListPage::~WorldListPage()
+{
+	m_worlds->stopWatching();
+	delete ui;
+}
+
+bool WorldListPage::shouldDisplay() const
+{
+	if (m_inst)
+		return !m_inst->isRunning();
+	return true;
+}
+
+bool WorldListPage::worldListFilter(QKeyEvent *keyEvent)
+{
+	switch (keyEvent->key())
+	{
+	case Qt::Key_Delete:
+		on_rmWorldBtn_clicked();
+		return true;
+	default:
+		break;
+	}
+	return QWidget::eventFilter(ui->worldTreeView, keyEvent);
+}
+
+bool WorldListPage::eventFilter(QObject *obj, QEvent *ev)
+{
+	if (ev->type() != QEvent::KeyPress)
+	{
+		return QWidget::eventFilter(obj, ev);
+	}
+	QKeyEvent *keyEvent = static_cast<QKeyEvent *>(ev);
+	if (obj == ui->worldTreeView)
+		return worldListFilter(keyEvent);
+	return QWidget::eventFilter(obj, ev);
+}
+void WorldListPage::on_rmWorldBtn_clicked()
+{
+	int first, last;
+	auto list = ui->worldTreeView->selectionModel()->selectedRows();
+
+	if (!lastfirst(list, first, last))
+		return;
+	m_worlds->stopWatching();
+	m_worlds->deleteWorlds(first, last);
+	m_worlds->startWatching();
+}
+
+void WorldListPage::on_viewFolderBtn_clicked()
+{
+	openDirInDefaultProgram(m_worlds->dir().absolutePath(), true);
+}
diff --git a/application/pages/WorldListPage.h b/application/pages/WorldListPage.h
new file mode 100644
index 00000000..f55f2999
--- /dev/null
+++ b/application/pages/WorldListPage.h
@@ -0,0 +1,69 @@
+//
+// Created by robotbrain on 8/18/15.
+//
+
+#pragma once
+
+#include <QWidget>
+
+#include "minecraft/OneSixInstance.h"
+#include "BasePage.h"
+#include <MultiMC.h>
+#include <pathutils.h>
+
+class WorldList;
+namespace Ui
+{
+class WorldListPage;
+}
+
+class WorldListPage : public QWidget, public BasePage
+{
+	Q_OBJECT
+
+public:
+	explicit WorldListPage(BaseInstance *inst, std::shared_ptr<WorldList> worlds, QString id,
+						   QString iconName, QString displayName, QString helpPage = "",
+						   QWidget *parent = 0);
+	virtual ~WorldListPage();
+
+	virtual QString displayName() const override
+	{
+		return m_displayName;
+	}
+	virtual QIcon icon() const override
+	{
+		return MMC->getThemedIcon(m_iconName);
+	}
+	virtual QString id() const override
+	{
+		return m_id;
+	}
+	virtual QString helpPage() const override
+	{
+		return m_helpName;
+	}
+	virtual bool shouldDisplay() const;
+
+	virtual void opened();
+	virtual void closed();
+
+protected:
+	bool eventFilter(QObject *obj, QEvent *ev);
+	bool worldListFilter(QKeyEvent *ev);
+
+protected:
+	BaseInstance *m_inst;
+
+private:
+	Ui::WorldListPage *ui;
+	std::shared_ptr<WorldList> m_worlds;
+	QString m_iconName;
+	QString m_id;
+	QString m_displayName;
+	QString m_helpName;
+
+private slots:
+	void on_rmWorldBtn_clicked();
+	void on_viewFolderBtn_clicked();
+};
diff --git a/application/pages/WorldListPage.ui b/application/pages/WorldListPage.ui
new file mode 100644
index 00000000..b8100acd
--- /dev/null
+++ b/application/pages/WorldListPage.ui
@@ -0,0 +1,94 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+    <class>WorldListPage</class>
+    <widget class="QWidget" name="WorldListPage">
+        <property name="geometry">
+            <rect>
+                <x>0</x>
+                <y>0</y>
+                <width>723</width>
+                <height>532</height>
+            </rect>
+        </property>
+        <property name="windowTitle">
+            <string>Mods</string>
+        </property>
+        <layout class="QVBoxLayout" name="verticalLayout">
+            <property name="leftMargin">
+                <number>0</number>
+            </property>
+            <property name="topMargin">
+                <number>0</number>
+            </property>
+            <property name="rightMargin">
+                <number>0</number>
+            </property>
+            <property name="bottomMargin">
+                <number>0</number>
+            </property>
+            <item>
+                <widget class="QTabWidget" name="tabWidget">
+                    <property name="currentIndex">
+                        <number>0</number>
+                    </property>
+                    <widget class="QWidget" name="tab">
+                        <attribute name="title">
+                            <string>Tab 1</string>
+                        </attribute>
+                        <layout class="QGridLayout" name="gridLayout">
+                            <item row="0" column="0">
+                                <widget class="QTreeView" name="worldTreeView">
+                                    <property name="sizePolicy">
+                                        <sizepolicy hsizetype="Expanding" vsizetype="Expanding">
+                                            <horstretch>0</horstretch>
+                                            <verstretch>0</verstretch>
+                                        </sizepolicy>
+                                    </property>
+                                    <property name="acceptDrops">
+                                        <bool>true</bool>
+                                    </property>
+                                    <property name="dragDropMode">
+                                        <enum>QAbstractItemView::DropOnly</enum>
+                                    </property>
+                                </widget>
+                            </item>
+                            <item row="0" column="1">
+                                <layout class="QVBoxLayout" name="verticalLayout_2">
+                                    <item>
+                                        <widget class="QPushButton" name="rmWorldBtn">
+                                            <property name="text">
+                                                <string>&amp;Remove</string>
+                                            </property>
+                                        </widget>
+                                    </item>
+                                    <item>
+                                        <spacer name="verticalSpacer">
+                                            <property name="orientation">
+                                                <enum>Qt::Vertical</enum>
+                                            </property>
+                                            <property name="sizeHint" stdset="0">
+                                                <size>
+                                                    <width>20</width>
+                                                    <height>40</height>
+                                                </size>
+                                            </property>
+                                        </spacer>
+                                    </item>
+                                    <item>
+                                        <widget class="QPushButton" name="viewFolderBtn">
+                                            <property name="text">
+                                                <string>&amp;View Folder</string>
+                                            </property>
+                                        </widget>
+                                    </item>
+                                </layout>
+                            </item>
+                        </layout>
+                    </widget>
+                </widget>
+            </item>
+        </layout>
+    </widget>
+    <resources/>
+    <connections/>
+</ui>
diff --git a/logic/CMakeLists.txt b/logic/CMakeLists.txt
index 1f6b62bf..df2aea28 100644
--- a/logic/CMakeLists.txt
+++ b/logic/CMakeLists.txt
@@ -199,6 +199,10 @@ set(LOGIC_SOURCES
 	minecraft/Mod.cpp
 	minecraft/ModList.h
 	minecraft/ModList.cpp
+	minecraft/World.h
+	minecraft/World.cpp
+	minecraft/WorldList.h
+	minecraft/WorldList.cpp
 
 	# FTB
 	ftb/OneSixFTBInstance.h
diff --git a/logic/minecraft/LegacyInstance.cpp b/logic/minecraft/LegacyInstance.cpp
index 9dd50c80..ff345033 100644
--- a/logic/minecraft/LegacyInstance.cpp
+++ b/logic/minecraft/LegacyInstance.cpp
@@ -33,6 +33,7 @@
 #include <launch/steps/TextPrint.h>
 #include <launch/steps/CheckJava.h>
 #include "minecraft/ModList.h"
+#include "minecraft/WorldList.h"
 #include <MMCZip.h>
 
 LegacyInstance::LegacyInstance(SettingsObjectPtr globalSettings, SettingsObjectPtr settings, const QString &rootDir)
@@ -319,6 +320,16 @@ std::shared_ptr<ModList> LegacyInstance::texturePackList() const
 	return texture_pack_list;
 }
 
+std::shared_ptr<WorldList> LegacyInstance::worldList() const
+{
+	if (!m_world_list)
+	{
+		m_world_list.reset(new WorldList(savesDir()));
+	}
+	m_world_list->update();
+	return m_world_list;
+}
+
 QString LegacyInstance::jarModsDir() const
 {
 	return PathCombine(instanceRoot(), "instMods");
diff --git a/logic/minecraft/LegacyInstance.h b/logic/minecraft/LegacyInstance.h
index 8663daba..724fcd33 100644
--- a/logic/minecraft/LegacyInstance.h
+++ b/logic/minecraft/LegacyInstance.h
@@ -49,6 +49,7 @@ public:
 	std::shared_ptr<ModList> coreModList() const;
 	std::shared_ptr<ModList> loaderModList() const;
 	std::shared_ptr<ModList> texturePackList() const override;
+	std::shared_ptr<WorldList> worldList() const override;
 
 	////// Directories //////
 	QString libDir() const;
@@ -126,6 +127,7 @@ protected:
 	mutable std::shared_ptr<ModList> core_mod_list;
 	mutable std::shared_ptr<ModList> loader_mod_list;
 	mutable std::shared_ptr<ModList> texture_pack_list;
+	mutable std::shared_ptr<WorldList> m_world_list;
 	std::shared_ptr<Setting> m_lwjglFolderSetting;
 protected
 slots:
diff --git a/logic/minecraft/MinecraftInstance.h b/logic/minecraft/MinecraftInstance.h
index b3af2fe8..8c6838e7 100644
--- a/logic/minecraft/MinecraftInstance.h
+++ b/logic/minecraft/MinecraftInstance.h
@@ -6,6 +6,7 @@
 #include "multimc_logic_export.h"
 
 class ModList;
+class WorldList;
 
 class MULTIMC_LOGIC_EXPORT MinecraftInstance: public BaseInstance
 {
@@ -25,6 +26,10 @@ public:
 	{
 		return nullptr;
 	}
+	virtual std::shared_ptr<WorldList> worldList() const
+	{
+		return nullptr;
+	}
 	/// get all jar mods applicable to this instance's jar
 	virtual QList<Mod> getJarMods() const
 	{
diff --git a/logic/minecraft/OneSixInstance.cpp b/logic/minecraft/OneSixInstance.cpp
index 57fa0a68..b0fab8af 100644
--- a/logic/minecraft/OneSixInstance.cpp
+++ b/logic/minecraft/OneSixInstance.cpp
@@ -35,6 +35,7 @@
 
 #include "minecraft/AssetsUtils.h"
 #include "icons/IconList.h"
+#include "minecraft/WorldList.h"
 
 OneSixInstance::OneSixInstance(SettingsObjectPtr globalSettings, SettingsObjectPtr settings, const QString &rootDir)
 	: MinecraftInstance(globalSettings, settings, rootDir)
@@ -392,6 +393,16 @@ std::shared_ptr<ModList> OneSixInstance::texturePackList() const
 	return m_texture_pack_list;
 }
 
+std::shared_ptr<WorldList> OneSixInstance::worldList() const
+{
+	if (!m_world_list)
+	{
+		m_world_list.reset(new WorldList(worldDir()));
+	}
+	m_world_list->update();
+	return m_world_list;
+}
+
 bool OneSixInstance::setIntendedVersionId(QString version)
 {
 	settings()->set("IntendedVersion", version);
@@ -556,6 +567,11 @@ QString OneSixInstance::libDir() const
 	return PathCombine(minecraftRoot(), "lib");
 }
 
+QString OneSixInstance::worldDir() const
+{
+	return PathCombine(minecraftRoot(), "saves");
+}
+
 QStringList OneSixInstance::extraArguments() const
 {
 	auto list = BaseInstance::extraArguments();
diff --git a/logic/minecraft/OneSixInstance.h b/logic/minecraft/OneSixInstance.h
index 963bd152..68be1d4d 100644
--- a/logic/minecraft/OneSixInstance.h
+++ b/logic/minecraft/OneSixInstance.h
@@ -36,6 +36,7 @@ public:
 	std::shared_ptr<ModList> coreModList() const;
 	std::shared_ptr<ModList> resourcePackList() const override;
 	std::shared_ptr<ModList> texturePackList() const override;
+	std::shared_ptr<WorldList> worldList() const override;
 	virtual QList<Mod> getJarMods() const override;
 	virtual void createProfile();
 
@@ -48,6 +49,7 @@ public:
 	QString loaderModsDir() const;
 	QString coreModsDir() const;
 	QString libDir() const;
+	QString worldDir() const;
 	virtual QString instanceConfigFolder() const override;
 
 	virtual std::shared_ptr<Task> createUpdateTask() override;
@@ -102,6 +104,7 @@ protected:
 	mutable std::shared_ptr<ModList> m_core_mod_list;
 	mutable std::shared_ptr<ModList> m_resource_pack_list;
 	mutable std::shared_ptr<ModList> m_texture_pack_list;
+	mutable std::shared_ptr<WorldList> m_world_list;
 };
 
 Q_DECLARE_METATYPE(std::shared_ptr<OneSixInstance>)
diff --git a/logic/minecraft/World.cpp b/logic/minecraft/World.cpp
new file mode 100644
index 00000000..0f7e0db1
--- /dev/null
+++ b/logic/minecraft/World.cpp
@@ -0,0 +1,72 @@
+/* Copyright 2013-2015 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <QDir>
+#include <QString>
+#include "World.h"
+#include <pathutils.h>
+
+World::World(const QFileInfo &file)
+{
+	repath(file);
+}
+
+void World::repath(const QFileInfo &file)
+{
+	m_file = file;
+	m_name = file.fileName();
+	is_valid = file.isDir() && QDir(file.filePath()).exists("level.dat");
+}
+
+bool World::replace(World &with)
+{
+	if (!destroy())
+		return false;
+	bool success = copyPath(with.m_file.filePath(), m_file.path());
+	if (success)
+	{
+		m_name = with.m_name;
+		m_file.refresh();
+	}
+	return success;
+}
+
+bool World::destroy()
+{
+	if(!is_valid) return false;
+	if (m_file.isDir())
+	{
+		QDir d(m_file.filePath());
+		if (d.removeRecursively())
+		{
+			return true;
+		}
+		return false;
+	}
+	else
+	{
+		return false;
+	}
+	return true;
+}
+
+bool World::operator==(const World &other) const
+{
+	return is_valid == other.is_valid && name() == other.name();
+}
+bool World::strongCompare(const World &other) const
+{
+	return is_valid == other.is_valid && name() == other.name();
+}
diff --git a/logic/minecraft/World.h b/logic/minecraft/World.h
new file mode 100644
index 00000000..d00062e7
--- /dev/null
+++ b/logic/minecraft/World.h
@@ -0,0 +1,47 @@
+/* Copyright 2013-2015 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+#include <QFileInfo>
+
+class World
+{
+public:
+	World(const QFileInfo &file);
+	QString name() const
+	{
+		return m_name;
+	}
+	bool isValid() const
+	{
+		return is_valid;
+	}
+	// delete all the files of this mod
+	bool destroy();
+	// replace this mod with a copy of the other
+	bool replace(World &with);
+	// change the mod's filesystem path (used by mod lists for *MAGIC* purposes)
+	void repath(const QFileInfo &file);
+
+	// WEAK compare operator - used for replacing mods
+	bool operator==(const World &other) const;
+	bool strongCompare(const World &other) const;
+
+protected:
+
+	QFileInfo m_file;
+	QString m_name;
+	bool is_valid;
+};
diff --git a/logic/minecraft/WorldList.cpp b/logic/minecraft/WorldList.cpp
new file mode 100644
index 00000000..ae0077e9
--- /dev/null
+++ b/logic/minecraft/WorldList.cpp
@@ -0,0 +1,226 @@
+/* Copyright 2013-2015 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "WorldList.h"
+#include <pathutils.h>
+#include <QMimeData>
+#include <QUrl>
+#include <QUuid>
+#include <QString>
+#include <QFileSystemWatcher>
+#include <QDebug>
+
+WorldList::WorldList(const QString &dir)
+	: QAbstractListModel(), m_dir(dir)
+{
+	ensureFolderPathExists(m_dir.absolutePath());
+	m_dir.setFilter(QDir::Readable | QDir::NoDotAndDotDot | QDir::Files | QDir::Dirs |
+					QDir::NoSymLinks);
+	m_dir.setSorting(QDir::Name | QDir::IgnoreCase | QDir::LocaleAware);
+	m_watcher = new QFileSystemWatcher(this);
+	is_watching = false;
+	connect(m_watcher, SIGNAL(directoryChanged(QString)), this,
+			SLOT(directoryChanged(QString)));
+}
+
+void WorldList::startWatching()
+{
+	update();
+	is_watching = m_watcher->addPath(m_dir.absolutePath());
+	if (is_watching)
+	{
+		qDebug() << "Started watching " << m_dir.absolutePath();
+	}
+	else
+	{
+		qDebug() << "Failed to start watching " << m_dir.absolutePath();
+	}
+}
+
+void WorldList::stopWatching()
+{
+	is_watching = !m_watcher->removePath(m_dir.absolutePath());
+	if (!is_watching)
+	{
+		qDebug() << "Stopped watching " << m_dir.absolutePath();
+	}
+	else
+	{
+		qDebug() << "Failed to stop watching " << m_dir.absolutePath();
+	}
+}
+
+void WorldList::internalSort(QList<World> &what)
+{
+	auto predicate = [](const World &left, const World &right)
+	{
+		return left.name().localeAwareCompare(right.name()) < 0;
+	};
+	std::sort(what.begin(), what.end(), predicate);
+}
+
+bool WorldList::update()
+{
+	if (!isValid())
+		return false;
+
+	QList<World> orderedWorlds;
+	QList<World> newWorlds;
+	m_dir.refresh();
+	auto folderContents = m_dir.entryInfoList();
+	// if there are any untracked files...
+	if (folderContents.size())
+	{
+		// the order surely changed!
+		for (auto entry : folderContents)
+		{
+			World w(entry);
+			if(w.isValid()) {
+				newWorlds.append(w);
+			}
+		}
+		internalSort(newWorlds);
+		orderedWorlds.append(newWorlds);
+	}
+	beginResetModel();
+	worlds.swap(orderedWorlds);
+	endResetModel();
+	return true;
+}
+
+void WorldList::directoryChanged(QString path)
+{
+	update();
+}
+
+bool WorldList::isValid()
+{
+	return m_dir.exists() && m_dir.isReadable();
+}
+
+bool WorldList::deleteWorld(int index)
+{
+	if (index >= worlds.size() || index < 0)
+		return false;
+	World &m = worlds[index];
+	if (m.destroy())
+	{
+		beginRemoveRows(QModelIndex(), index, index);
+		worlds.removeAt(index);
+		endRemoveRows();
+		emit changed();
+		return true;
+	}
+	return false;
+}
+
+bool WorldList::deleteWorlds(int first, int last)
+{
+	for (int i = first; i <= last; i++)
+	{
+		World &m = worlds[i];
+		m.destroy();
+	}
+	beginRemoveRows(QModelIndex(), first, last);
+	worlds.erase(worlds.begin() + first, worlds.begin() + last + 1);
+	endRemoveRows();
+	emit changed();
+	return true;
+}
+
+int WorldList::columnCount(const QModelIndex &parent) const
+{
+	return 1;
+}
+
+QVariant WorldList::data(const QModelIndex &index, int role) const
+{
+	if (!index.isValid())
+		return QVariant();
+
+	int row = index.row();
+	int column = index.column();
+
+	if (row < 0 || row >= worlds.size())
+		return QVariant();
+
+	switch (role)
+	{
+	case Qt::DisplayRole:
+		switch (column)
+		{
+		case NameColumn:
+			return worlds[row].name();
+
+		default:
+			return QVariant();
+		}
+
+	case Qt::ToolTipRole:
+		return worlds[row].name();
+	default:
+		return QVariant();
+	}
+}
+
+QVariant WorldList::headerData(int section, Qt::Orientation orientation, int role) const
+{
+	switch (role)
+	{
+	case Qt::DisplayRole:
+		switch (section)
+		{
+		case NameColumn:
+			return tr("Name");
+		default:
+			return QVariant();
+		}
+
+	case Qt::ToolTipRole:
+		switch (section)
+		{
+		case NameColumn:
+			return tr("The name of the world.");
+		default:
+			return QVariant();
+		}
+	default:
+		return QVariant();
+	}
+	return QVariant();
+}
+
+QStringList WorldList::mimeTypes() const
+{
+	QStringList types;
+	types << "text/plain";
+	return types;
+}
+
+QMimeData *WorldList::mimeData(const QModelIndexList &indexes) const
+{
+	QMimeData *data = new QMimeData();
+
+	if (indexes.size() == 0)
+		return data;
+
+	auto idx = indexes[0];
+	int row = idx.row();
+	if (row < 0 || row >= worlds.size())
+		return data;
+
+	data->setText(QString::number(row));
+	return data;
+}
diff --git a/logic/minecraft/WorldList.h b/logic/minecraft/WorldList.h
new file mode 100644
index 00000000..3f337c72
--- /dev/null
+++ b/logic/minecraft/WorldList.h
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2015 <copyright holder> <email>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#pragma once
+
+#include <QList>
+#include <QString>
+#include <QDir>
+#include <QAbstractListModel>
+#include "minecraft/World.h"
+
+class QFileSystemWatcher;
+
+class WorldList : public QAbstractListModel
+{
+    Q_OBJECT
+public:
+    enum Columns {
+        NameColumn
+    };
+
+    WorldList ( const QString &dir );
+
+    virtual QVariant data ( const QModelIndex &index, int role = Qt::DisplayRole ) const;
+
+    virtual int rowCount ( const QModelIndex &parent = QModelIndex() ) const {
+        return size();
+    }
+    ;
+    virtual QVariant headerData ( int section, Qt::Orientation orientation,
+                                  int role = Qt::DisplayRole ) const;
+    virtual int columnCount ( const QModelIndex &parent ) const;
+
+    size_t size() const {
+        return worlds.size();
+    }
+    ;
+    bool empty() const {
+        return size() == 0;
+    }
+    World &operator[] ( size_t index ) {
+        return worlds[index];
+    }
+
+    /// Reloads the mod list and returns true if the list changed.
+    virtual bool update();
+
+    /// Deletes the mod at the given index.
+    virtual bool deleteWorld ( int index );
+
+    /// Deletes all the selected mods
+    virtual bool deleteWorlds ( int first, int last );
+
+    /// get data for drag action
+    virtual QMimeData *mimeData ( const QModelIndexList &indexes ) const;
+    /// get the supported mime types
+    virtual QStringList mimeTypes() const;
+
+    void startWatching();
+    void stopWatching();
+
+    virtual bool isValid();
+
+    QDir dir() {
+        return m_dir;
+    }
+
+    const QList<World> & allWorlds() {
+        return worlds;
+    }
+
+private:
+    void internalSort ( QList<World> & what );
+    private
+slots:
+    void directoryChanged ( QString path );
+
+signals:
+    void changed();
+
+protected:
+    QFileSystemWatcher *m_watcher;
+    bool is_watching;
+    QDir m_dir;
+    QList<World> worlds;
+};
+