/***************************************************************************
 *   Copyright (c) 2004 Werner Mayer <wmayer[at]users.sourceforge.net>     *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 of the License, or (at your option) any later version.      *
 *                                                                         *
 *   This library  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 Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/


#ifndef GUI_WIDGETS_H
#define GUI_WIDGETS_H

#include <Gui/ui_DlgTreeWidget.h>
#include <QListWidget>
#include <QLabel>
#include <QLineEdit>
#include <QPointer>
#include <QPushButton>
#include <QBasicTimer>
#include <QTime>

namespace Gui {
class PrefCheckBox;
class CommandViewItemPrivate;

/**
 * This class allows to drag one or more items which correspond to a Command object.
 * The dragged items can be dropped onto the @ref Gui::PythonConsole.
 * @see CommandViewItem, Command
 * @author Werner Mayer
 */
class CommandIconView : public QListWidget
{
  Q_OBJECT

public:
  CommandIconView (QWidget * parent = 0);
  virtual ~CommandIconView ();

protected:
  void startDrag ( Qt::DropActions supportedActions );

protected Q_SLOTS:
  void onSelectionChanged( QListWidgetItem * item, QListWidgetItem * );

Q_SIGNALS:
  /** Emits this signal if selection has changed. */
  void emitSelectionChanged( const QString& );
};

// ------------------------------------------------------------------------------

class GuiExport ActionSelector : public QWidget
{
    Q_OBJECT

public:
    ActionSelector(QWidget* parent=0);
    ~ActionSelector();

    QTreeWidget* availableTreeWidget() const
    { return availableWidget; }
    QTreeWidget* selectedTreeWidget() const
    { return selectedWidget; }
    void setSelectedLabel(const QString&);
    QString selectedLabel() const;
    void setAvailableLabel(const QString&);
    QString availableLabel() const;

private:
    void keyPressEvent(QKeyEvent *);
    void changeEvent(QEvent*);
    void retranslateUi();
    void setButtonsEnabled();

private Q_SLOTS:
    void on_addButton_clicked();
    void on_removeButton_clicked();
    void on_upButton_clicked();
    void on_downButton_clicked();
    void onCurrentItemChanged(QTreeWidgetItem*, QTreeWidgetItem*);
    void onItemDoubleClicked(QTreeWidgetItem * item, int column);

private:
    QGridLayout *gridLayout;
    QVBoxLayout *vboxLayout;
    QVBoxLayout *vboxLayout1;
    QPushButton *addButton;
    QPushButton *removeButton;
    QPushButton *upButton;
    QPushButton *downButton;
    QLabel      *labelAvailable;
    QLabel      *labelSelected;
    QTreeWidget *availableWidget;
    QTreeWidget *selectedWidget;
    QSpacerItem *spacerItem;
    QSpacerItem *spacerItem1;
};

// ------------------------------------------------------------------------------

/**
 * The AccelLineEdit class provides a lineedit to specfify shortcuts.
 * \author Werner Mayer
 */
class GuiExport AccelLineEdit : public QLineEdit
{
  Q_OBJECT

public:
  AccelLineEdit ( QWidget * parent=0 );

protected:
  void keyPressEvent ( QKeyEvent * e);
};

// ------------------------------------------------------------------------------

typedef QPair<QString, bool> CheckListItem;

/**
 * The CheckListDialog class provides a dialog with a QListView with
 * checkable items inside.
 * \author Werner Mayer
 */
class GuiExport CheckListDialog : public QDialog
{

  Q_OBJECT

public:
  CheckListDialog( QWidget* parent = 0, Qt::WFlags fl = 0 );
  ~CheckListDialog();

  void setCheckableItems( const QStringList& items );
  void setCheckableItems( const QList<CheckListItem>& items );
  QStringList getCheckedItems() const;

  void accept ();

private:
  QStringList checked;
  Ui_DlgTreeWidget ui;
};

// ------------------------------------------------------------------------------

/**
 *  Implementation of a color button.
 * \author Werner Mayer
 */
class GuiExport ColorButton : public QPushButton
{
    Q_OBJECT

    Q_PROPERTY( QColor color READ color WRITE setColor )
    Q_PROPERTY( bool allowChangeColor READ allowChangeColor WRITE setAllowChangeColor )
    Q_PROPERTY( bool drawFrame READ drawFrame WRITE setDrawFrame )

public:
    ColorButton(QWidget* parent = 0);
    ~ColorButton();

    void setColor(const QColor&);
    QColor color() const;

    void setAllowChangeColor(bool);
    bool allowChangeColor() const;

    void setDrawFrame(bool);
    bool drawFrame() const;

    void setModal(bool);
    bool isModal() const;

public Q_SLOTS:
    void onChooseColor();

private Q_SLOTS:
    void onColorChosen(const QColor&);
    void onRejected();

Q_SIGNALS:
    /** Emits this signal when color has changed */
    void changed();

protected:
    void paintEvent (QPaintEvent*);

private:
    struct ColorButtonP *d;
};

// ------------------------------------------------------------------------------

/**
 * A text label where a url can specified. When the user clicks on the text label the system browser
 * gets opened with the specified url. 
 *
 * This can be used for e.g. in the about dialog where the url of the maintainer of an application
 * can be specified.
 * @author Werner Mayer
 */
class GuiExport UrlLabel : public QLabel
{
  Q_OBJECT
  Q_PROPERTY( QString  url    READ url   WRITE setUrl)

public:
  UrlLabel ( QWidget * parent = 0, Qt::WFlags f = 0 );
  virtual ~UrlLabel();

  QString url() const;

public Q_SLOTS:
  void setUrl( const QString &u );

protected:
  void enterEvent ( QEvent * );
  void leaveEvent ( QEvent * );
  void mouseReleaseEvent ( QMouseEvent * );

private:
  QString _url;
};

// ----------------------------------------------------------------------

/**
 * The LabelButton class provides a label with a button on the right side.
 * @author Werner Mayer
 */
class GuiExport LabelButton : public QWidget
{
    Q_OBJECT

    Q_PROPERTY(QVariant value  READ value  WRITE setValue)

public:
    LabelButton (QWidget * parent = 0);
    virtual ~LabelButton();

    QVariant value() const;

    QLabel *getLabel() const;
    QPushButton *getButton() const;

public Q_SLOTS:
    void setValue(const QVariant&);

protected:
    virtual void showValue(const QVariant&) = 0;
    void resizeEvent(QResizeEvent*);

protected Q_SLOTS:
    virtual void browse() = 0;

Q_SIGNALS:
    void valueChanged(const QVariant &);

private:
    QLabel *label;
    QPushButton *button;
    QVariant _val;
};

// ----------------------------------------------------------------------

/**
 * Qt's tooltip does not work as expected with some classes, e.g. when showing
 * it in the 3d view it immediately receives a timer event to destroy itself.
 * This class is thought to circumvent this behaviour by filtering the internal
 * timer events.
 * @author Werner Mayer
 */
class GuiExport ToolTip : public QObject
{
public:
    static void showText(const QPoint & pos, const QString & text, QWidget * w = 0);

protected:
    static ToolTip* instance();

    ToolTip();
    virtual ~ToolTip();

    void timerEvent(QTimerEvent *e);
    bool eventFilter(QObject* o, QEvent*e);

    void installEventFilter();
    void removeEventFilter();

private:
    bool installed, hidden;
    static ToolTip* inst;
    QString text;
    QPoint pos;
    QPointer<QWidget> w; // need guard in case widget gets destroyed
    QBasicTimer tooltipTimer;
    QTime displayTime;
};

// ----------------------------------------------------------------------

class GuiExport StatusWidget : public QWidget
{
    Q_OBJECT

public:
    StatusWidget(QWidget* parent);
    ~StatusWidget();
    void setStatusText(const QString&);
    QSize sizeHint () const;
    void showText(int ms);

protected:
    void showEvent(QShowEvent*);
    void hideEvent(QHideEvent*);
    void adjustPosition(QWidget* w);

private:
    QLabel* label;
};

// ----------------------------------------------------------------------

class GuiExport LabelEditor : public QWidget
{
    Q_OBJECT

    Q_PROPERTY(QString  text        READ text        WRITE setText      )
    Q_PROPERTY(QString  buttonText  READ buttonText  WRITE setButtonText)

public:
    LabelEditor (QWidget * parent = 0);
    virtual ~LabelEditor();

    /** 
    * Returns the filename.
    */
    QString text() const;

    /**
    * Returns the button's text.
    */
    QString buttonText() const;

public Q_SLOTS:
    virtual void setText(const QString &);
    virtual void setButtonText (const QString &);

Q_SIGNALS:
    void textChanged(const QString &);

private Q_SLOTS:
    void changeText();

private:
    QLineEdit *lineEdit;
    QPushButton *button;
};

} // namespace Gui

#endif // GUI_WIDGETS_H