Added some parts of ctk lib.

As it looks now that lib contains way more then I want to pull in so i'm just copying the files i'm interested in.

ctk/ctkPopupWidget.h

@@ -0,0 +1,133 @@
+/*=========================================================================
+
+  Library:   CTK
+
+  Copyright (c) Kitware Inc.
+
+  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.txt
+
+  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.
+
+=========================================================================*/
+
+#ifndef __ctkPopupWidget_h
+#define __ctkPopupWidget_h
+
+// CTK includes
+#include "ctkBasePopupWidget.h"
+
+class ctkPopupWidgetPrivate;
+
+/// \ingroup Widgets
+/// ctkPopupWidget is a specialization of ctkBasePopupWidget that handles
+/// the opening and closing of the popup.
+/// Below is an example of a popup slider that opens and closes next to a
+/// button
+/// \code
+/// ctkPopupWidget* popup = new ctkPopupWidget(pushButton);
+/// popup->setAlignment(Qt::AlignRight | Qt::AlignTop | Qt::AlignBottom);
+/// popup->setOrientation(Qt::Horizontal);
+/// QHBoxLayout* popupLayout = new QHBoxLayout(popup);
+/// QSlider* popupSlider = new QSlider(popup);
+/// popupLayout->addWidget(popupSlider);
+/// \endcode
+/// \sa ctkBasePopupWidget
+class CTK_WIDGETS_EXPORT ctkPopupWidget : public ctkBasePopupWidget
+{
+  Q_OBJECT
+
+  /// Control whether the popup listens to the application and baseWidget
+  /// events and decides if it needs to be permanently or temporarily hidden.
+  /// You might want to setActive(false) when embedding the popup
+  /// into a static layout intead of having it top-level (no parent).
+  /// Consider also removing its windowFlags (Qt::ToolTip |
+  /// Qt::FramelessWindowHint) and removing the baseWidget.
+  /// True by default
+  /// \sa isActive(), setActive()
+  Q_PROPERTY( bool active READ isActive WRITE setActive)
+
+  /// Control wether the popup automatically opens when the mouse
+  /// enter the widget. True by default
+  /// \sa autoShow(), setAutoShow()
+  Q_PROPERTY( bool autoShow READ autoShow WRITE setAutoShow)
+
+  /// Time in ms to wait before opening the popup if autoShow is set.
+  /// 20ms by default
+  /// \sa showDelay(), setShowDelay()
+  Q_PROPERTY( int showDelay READ showDelay WRITE setShowDelay)
+
+  /// Control wether the popup automatically closes when the mouse
+  /// leaves the widget. True by default.
+  /// \sa autoHide(), setAutoHide()
+  Q_PROPERTY( bool autoHide READ autoHide WRITE setAutoHide)
+
+  /// Time in ms to wait before closing the popup if autoHide is set.
+  /// 200ms by default
+  /// \sa hideDelay(), setHideDelay()
+  Q_PROPERTY( int hideDelay READ hideDelay WRITE setHideDelay)
+
+public:
+  typedef ctkBasePopupWidget Superclass;
+  /// By default, the parent is the \a baseWidget.
+  /// \sa baseWidget()
+  explicit ctkPopupWidget(QWidget* parent = 0);
+  virtual ~ctkPopupWidget();
+
+  bool isActive()const;
+  void setActive(bool);
+
+  bool autoShow()const;
+  /// Calling setAutoShow automatically updates opens the popup if the cursor
+  /// is above the popup or the base widget.
+  void setAutoShow(bool);
+
+  int showDelay()const;
+  void setShowDelay(int delay);
+
+  bool autoHide()const;
+  /// Don't automatically close the popup when leaving the widget.
+  /// Calling setAutoHide automatically updates the state close the popup
+  /// if the mouse is not over the popup nor the base widget.
+  void setAutoHide(bool autoHide);
+
+  int hideDelay()const;
+  void setHideDelay(int delay);
+
+public Q_SLOTS:
+  /// Convenient function that calls setAutoHide(!pin) and opens the popup
+  /// if pin is true regardless of the value of \a AutoShow.
+  /// It is typically connected with a checkable button to anchor the popup.
+  void pinPopup(bool pin);
+
+public:
+  /// Reimplemented for internal reasons
+  virtual void hidePopup();
+
+protected:
+  virtual void leaveEvent(QEvent* event);
+  virtual void enterEvent(QEvent* event);
+  virtual bool eventFilter(QObject* obj, QEvent* event);
+
+  /// Widget the popup is attached to. It opens right under \a baseWidget
+  /// and if the ctkPopupWidget sizepolicy contains the growFlag/shrinkFlag,
+  /// it tries to resize itself to fit the same width of \a baseWidget.
+  virtual void setBaseWidget(QWidget* baseWidget);
+
+protected Q_SLOTS:
+  void updatePopup();
+  virtual void onEffectFinished();
+
+private:
+  Q_DECLARE_PRIVATE(ctkPopupWidget);
+  Q_DISABLE_COPY(ctkPopupWidget);
+};
+
+#endif