Switch database tab when hovering over it in drag and drop.

Closes #26

src/CMakeLists.txt

@@ -58,6 +58,7 @@ set(keepassx_SOURCES
     gui/DatabaseTabWidget.cpp
     gui/DatabaseWidget.cpp
     gui/DialogyWidget.cpp
+    gui/DragTabBar.cpp
     gui/EditEntryWidget.cpp
     gui/EditGroupWidget.cpp
     gui/EditWidget.cpp
@@ -96,6 +97,7 @@ set(keepassx_MOC
     gui/DatabaseTabWidget.h
     gui/DatabaseWidget.h
     gui/DialogyWidget.h
+    gui/DragTabBar.h
     gui/EditEntryWidget.h
     gui/EditGroupWidget.h
     gui/EditWidget.h

src/gui/DatabaseTabWidget.cpp

@@ -26,6 +26,7 @@
 #include "core/Metadata.h"
 #include "gui/DatabaseOpenDialog.h"
 #include "gui/DatabaseWidget.h"
+#include "gui/DragTabBar.h"
 #include "gui/EntryView.h"
 #include "gui/FileDialog.h"
 #include "gui/GroupView.h"
@@ -43,6 +44,10 @@ DatabaseTabWidget::DatabaseTabWidget(QWidget* parent)
     : QTabWidget(parent)
     , m_window(parent->window())
 {
+    DragTabBar* tabBar = new DragTabBar(this);
+    tabBar->setDrawBase(false);
+    setTabBar(tabBar);
+
     connect(this, SIGNAL(tabCloseRequested(int)), SLOT(closeDatabase(int)));
     connect(this, SIGNAL(currentChanged(int)), SLOT(emitEntrySelectionChanged()));
 }

src/gui/DragTabBar.cpp

@@ -0,0 +1,101 @@
+/*
+ *  Copyright (C) 2012 Felix Geyer <debfx@fobos.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "DragTabBar.h"
+
+#include <QtCore/QTimer>
+#include <QtGui/QApplication>
+#include <QtGui/QDragEnterEvent>
+
+DragTabBar::DragTabBar(QWidget* parent)
+    : QTabBar(parent)
+    , m_tabSwitchTimer(new QTimer(this))
+    , m_tabSwitchIndex(-1)
+{
+    m_tabSwitchTimer->setSingleShot(true);
+    connect(m_tabSwitchTimer, SIGNAL(timeout()), SLOT(dragSwitchTab()));
+
+    setAcceptDrops(true);
+}
+
+void DragTabBar::dragEnterEvent(QDragEnterEvent* event)
+{
+    int tab = tabAt(event->pos());
+
+    if (tab != -1) {
+        if (tab != currentIndex()) {
+            m_tabSwitchIndex = tab;
+            m_tabSwitchTimer->start(QApplication::doubleClickInterval() * 2);
+        }
+        event->setAccepted(true);
+    }
+    else {
+        QTabBar::dragEnterEvent(event);
+    }
+}
+
+void DragTabBar::dragMoveEvent(QDragMoveEvent* event)
+{
+    int tab = tabAt(event->pos());
+
+    if (tab != -1) {
+        if (tab == currentIndex()) {
+            m_tabSwitchTimer->stop();
+        }
+        else if (tab != m_tabSwitchIndex) {
+            m_tabSwitchIndex = tab;
+            m_tabSwitchTimer->start(QApplication::doubleClickInterval() * 2);
+        }
+        event->setAccepted(true);
+    }
+    else {
+        m_tabSwitchIndex = -1;
+        m_tabSwitchTimer->stop();
+        QTabBar::dragMoveEvent(event);
+    }
+}
+
+void DragTabBar::dragLeaveEvent(QDragLeaveEvent* event)
+{
+    m_tabSwitchIndex = -1;
+    m_tabSwitchTimer->stop();
+    QTabBar::dragLeaveEvent(event);
+}
+
+void DragTabBar::dropEvent(QDropEvent* event)
+{
+    m_tabSwitchIndex = -1;
+    m_tabSwitchTimer->stop();
+    QTabBar::dropEvent(event);
+}
+
+void DragTabBar::tabLayoutChange()
+{
+    m_tabSwitchIndex = -1;
+    m_tabSwitchTimer->stop();
+    QTabBar::tabLayoutChange();
+}
+
+void DragTabBar::dragSwitchTab()
+{
+    int tab = tabAt(mapFromGlobal(QCursor::pos()));
+
+    if (tab != -1 && tab == m_tabSwitchIndex) {
+        m_tabSwitchIndex = -1;
+        setCurrentIndex(tab);
+    }
+}

src/gui/DragTabBar.h

@@ -0,0 +1,45 @@
+/*
+ *  Copyright (C) 2012 Felix Geyer <debfx@fobos.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KEEPASSX_DRAGTABWIDGET_H
+#define KEEPASSX_DRAGTABWIDGET_H
+
+#include <QtGui/QTabBar>
+
+class DragTabBar : public QTabBar
+{
+    Q_OBJECT
+
+public:
+    DragTabBar(QWidget* parent = 0);
+
+protected:
+    void dragEnterEvent(QDragEnterEvent* event);
+    void dragMoveEvent(QDragMoveEvent* event);
+    void dragLeaveEvent(QDragLeaveEvent* event);
+    void dropEvent(QDropEvent* event);
+    void tabLayoutChange();
+
+private Q_SLOTS:
+    void dragSwitchTab();
+
+private:
+    QTimer* m_tabSwitchTimer;
+    int m_tabSwitchIndex;
+};
+
+#endif // KEEPASSX_DRAGTABWIDGET_H