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+/*
+  This file                  Copyright (C) 2003 Michael 'Mickey' Lauer <mickey@tm.informatik.uni-frankfurt.de>
+    is part of the           Copyright (C) 2001 Carsten Pfeiffer <pfeiffer@kde.org>, Dawit Alemayehu <adawit@kde.org>
+       Opie Project          Copyright (C) 1999 Preston Brown <pbrown@kde.org>, Patrick Ward <PAT_WARD@HP-USA-om5.om.hp.com>
+                             Copyright (C) 1997 Sven Radej (sven.radej@iname.com)
+              =.
+            .=l.
+           .>+-=
+ _;:,     .>    :=|.         This program is free software; you can
+.> <`_,   >  .   <=          redistribute it and/or  modify it under
+:`=1 )Y*s>-.--   :           the terms of the GNU Library General Public
+.="- .-=="i,     .._         License as published by the Free Software
+ - .   .-<_>     .<>         Foundation; either version 2 of the License,
+     ._= =}       :          or (at your option) any later version.
+    .%`+i>       _;_.
+    .i_,=:_.      -<s.       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
+..}^=.=       =       ;      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 OLINEEDIT_H
+#define OLINEEDIT_H
+
+/* QT */
+
+#include <qlineedit.h>
+
+/* OPIE */
+
+#include <opie2/ocompletion.h>
+#include <opie2/ocompletionbase.h>
+
+class QPopupMenu;
+
+class OCompletionBox;
+typedef QString KURL; //class KURL;
+
+/**
+ * An enhanced QLineEdit widget for inputting text.
+ *
+ * @sect Detail
+ *
+ * This widget inherits from @ref QLineEdit and implements the following
+ * additional functionalities: q completion object that provides both
+ * automatic and manual text completion as well as multiple match iteration
+ * features, configurable key-bindings to activate these features and a
+ * popup-menu item that can be used to allow the user to set text completion
+ * modes on the fly based on their preference.
+ *
+ * To support these new features OLineEdit also emits a few more
+ * additional signals.  These are: @ref completion( const QString& ),
+ * textRotation( KeyBindingType ), and @ref returnPressed( const QString& ).
+ * The completion signal can be connected to a slot that will assist the
+ * user in filling out the remaining text.  The text rotation signal is
+ * intended to be used to iterate through the list of all possible matches
+ * whenever there is more than one match for the entered text.  The
+ * @p returnPressed( const QString& ) signals are the same as QLineEdit's
+ * except it provides the current text in the widget as its argument whenever
+ * appropriate.
+ *
+ * This widget by default creates a completion object when you invoke
+ * the @ref completionObject( bool ) member function for the first time or
+ * use @ref setCompletionObject( OCompletion*, bool ) to assign your own
+ * completion object.  Additionally, to make this widget more functional,
+ * OLineEdit will by default handle the text rotation and completion
+ * events internally when a completion object is created through either one
+ * of the methods mentioned above.  If you do not need this functionality,
+ * simply use @ref OCompletionBase::setHandleSignals( bool ) or set the
+ * boolean parameter in the above functions to FALSE.
+ *
+ * The default key-bindings for completion and rotation is determined
+ * from the global settings in @ref OStdAccel.  These values, however,
+ * can be overriden locally by invoking @ref OCompletionBase::setKeyBinding().
+ * The values can easily be reverted back to the default setting, by simply
+ * calling @ref useGlobalSettings(). An alternate method would be to default
+ * individual key-bindings by usning @ref setKeyBinding() with the default
+ * second argument.
+ *
+ * NOTE that if the @p EchoMode for this widget is set to something other
+ * than @p QLineEdit::Normal, the completion mode will always be defaulted
+ * to @ref PGlobalSettings::CompletionNone.  This is done purposefully to guard
+ * against protected entries such as passwords being cached in @ref OCompletion's
+ * list. Hence, if the @p EchoMode is not @ref QLineEdit::Normal, the completion
+ * mode is automatically disabled.
+ *
+ * @sect Useage
+ *
+ * To enable the basic completion feature :
+ *
+ * <pre>
+ * OLineEdit *edit = new OLineEdit( this, "mywidget" );
+ * OCompletion *comp = edit->completionObject();
+ * // Fill the completion object with a list of possible matches
+ * QStringList list;
+ * list << "mickeyl@handhelds.org" << "mickey@tm.informatik.uni-frankfurt.de>" << "mickey@Vanille.de";
+ * comp->setItems( list );
+ * // Connect to the return pressed signal (optional)
+ * connect(edit,SIGNAL(returnPressed(const QString&)),comp,SLOT(addItem(const QString&));
+ * </pre>
+ *
+ * To use a customized completion objects or your
+ * own completion object :
+ *
+ * <pre>
+ * OLineEdit *edit = new OLineEdit( this,"mywidget" );
+ * KURLCompletion *comp = new KURLCompletion();
+ * edit->setCompletionObject( comp );
+ * // Connect to the return pressed signal - optional
+ * connect(edit,SIGNAL(returnPressed(const QString&)),comp,SLOT(addItem(const QString&));
+ * </pre>
+ *
+ * Note that you have to either delete the allocated completion object
+ * when you don't need it anymore, or call
+ * setAutoDeleteCompletionObject( true );
+ *
+ * @sect Miscellaneous function calls :
+ *
+ * <pre>
+ * // Tell the widget not to handle completion and
+ * // iteration internally.
+ * edit->setHandleSignals( false );
+ * // Set your own completion key for manual completions.
+ * edit->setKeyBinding( OCompletionBase::TextCompletion, Qt::End );
+ * // Hide the context (popup) menu
+ * edit->setContextMenuEnabled( false );
+ * // Temporarly disable signal emitions
+ * // (both completion & iteration signals)
+ * edit->disableSignals();
+ * // Default the key-bindings to system settings.
+ * edit->useGlobalKeyBindings();
+ * </pre>
+ *
+ * @short An enhanced single line input widget.
+ * @author Dawit Alemayehu <adawit@kde.org>
+ * @author Opie adaption by Michael Lauer <mickey@tm.informatik.uni-frankfurt.de>
+ */
+
+class OLineEdit : public QLineEdit, public OCompletionBase
+{
+    friend class OComboBox;
+
+    Q_OBJECT
+    Q_PROPERTY( bool contextMenuEnabled READ isContextMenuEnabled WRITE setContextMenuEnabled )
+    Q_PROPERTY( bool urlDropsEnabled READ isURLDropsEnabled WRITE setURLDropsEnabled )
+
+public:
+
+    /**
+     * Constructs a OLineEdit object with a default text, a parent,
+     * and a name.
+     *
+     * @param string Text to be shown in the edit widget.
+     * @param parent The parent object of this widget.
+     * @param name the name of this widget
+     */
+    OLineEdit( const QString &string, QWidget *parent, const char *name = 0 );
+
+    /**
+     * Constructs a OLineEdit object with a parent and a name.
+     *
+     * @param string Text to be shown in the edit widget.
+     * @param parent The parent object of this widget.
+     * @param name The name of this widget.
+     */
+    OLineEdit ( QWidget *parent=0, const char *name=0 );
+
+    /**
+     *  Destructor.
+     */
+    virtual ~OLineEdit ();
+
+    /**
+     * Sets @p url into the lineedit. It uses @ref KURL::prettyURL() so
+     * that the url is properly decoded for displaying.
+     */
+    void setURL( const KURL& url );
+
+    /**
+     * Puts the text cursor at the end of the string.
+     *
+     * This method is deprecated.  Use @ref QLineEdit::end()
+     * instead.
+     *
+     * @deprecated
+     * @ref QLineEdit::end()
+     */
+    void cursorAtEnd() { end( false ); }
+
+    /**
+     * Re-implemented from @ref OCompletionBase for internal reasons.
+     *
+     * This function is re-implemented in order to make sure that
+     * the EchoMode is acceptable before we set the completion mode.
+     *
+     * See @ref OCompletionBase::setCompletionMode
+     */
+    virtual void setCompletionMode( OGlobalSettings::Completion mode );
+
+   /**
+    * Enables/disables the popup (context) menu.
+    *
+    * Note that when this function is invoked with its argument
+    * set to @p true, then both the context menu and the completion
+    * menu item are enabled.  If you do not want to the completion
+    * item to be visible simply invoke @ref hideModechanger() right
+    * after calling this method.  Also by default, the context
+    * menu is automatically created if this widget is editable. Thus
+    * you need to call this function with the argument set to false
+    * if you do not want this behaviour.
+    *
+    * @param showMenu If @p true, show the context menu.
+    */
+    virtual void setContextMenuEnabled( bool showMenu ) {  m_bEnableMenu = showMenu; }
+
+    /**
+     * Returns @p true when the context menu is enabled.
+     */
+    bool isContextMenuEnabled() const { return m_bEnableMenu; }
+
+    /**
+     * Enables/Disables handling of URL drops. If enabled and the user
+     * drops an URL, the decoded URL will be inserted. Otherwise the default
+     * behaviour of QLineEdit is used, which inserts the encoded URL.
+     *
+     * @param enable If @p true, insert decoded URLs
+     */
+    void setURLDropsEnabled( bool enable );
+
+    /**
+     * Returns @p true when decoded URL drops are enabled
+     */
+    bool isURLDropsEnabled() const;
+
+    /**
+     * By default, OLineEdit recognizes @p Key_Return and @p Key_Enter and emits
+     * the @ref returnPressed() signals, but it also lets the event pass,
+     * for example causing a dialog's default-button to be called.
+     *
+     * Call this method with @p trap = @p true to make @p OLineEdit stop these
+     * events. The signals will still be emitted of course.
+     *
+     * @see trapReturnKey()
+     */
+    void setTrapReturnKey( bool trap );
+
+    /**
+     * @returns @p true if keyevents of @p Key_Return or
+     * @p Key_Enter will be stopped or if they will be propagated.
+     *
+     * @see setTrapReturnKey ()
+     */
+    bool trapReturnKey() const;
+
+    /**
+     * Re-implemented for internal reasons.  API not affected.
+     *
+     * @reimplemented
+     */
+    virtual bool eventFilter( QObject *, QEvent * );
+
+    /**
+     * @returns the completion-box, that is used in completion mode
+     * @ref KGlobalSettings::CompletionPopup.
+     * This method will create a completion-box if none is there, yet.
+     *
+     * @param create Set this to false if you don't want the box to be created
+     *               i.e. to test if it is available.
+     */
+    OCompletionBox * completionBox( bool create = true );
+
+    /**
+     * Reimplemented for internal reasons, the API is not affected.
+     */
+    virtual void setCompletionObject( OCompletion *, bool hsig = true );
+
+
+signals:
+
+    /**
+     * Emitted when the user presses the return key.
+     *
+     *  The argument is the current text.  Note that this
+     * signal is @em not emitted if the widget's @p EchoMode is set to
+     * @ref QLineEdit::EchoMode.
+     */
+    void returnPressed( const QString& );
+
+    /**
+     * Emitted when the completion key is pressed.
+     *
+     * Please note that this signal is @em not emitted if the
+     * completion mode is set to @p CompletionNone or @p EchoMode is
+     * @em normal.
+     */
+    void completion( const QString& );
+
+    /**
+     * Emitted when the shortcut for substring completion is pressed.
+     */
+    void substringCompletion( const QString& );
+
+    /**
+     * Emitted when the text rotation key-bindings are pressed.
+     *
+     * The argument indicates which key-binding was pressed.
+     * In OLineEdit's case this can be either one of two values:
+     * @ref PrevCompletionMatch or @ref NextCompletionMatch. See
+     * @ref OCompletionBase::setKeyBinding for details.
+     *
+     * Note that this signal is @em not emitted if the completion
+     * mode is set to @p KGlobalSettings::CompletionNone or @p echoMode() is @em not  normal.
+     */
+    void textRotation( OCompletionBase::KeyBindingType );
+
+    /**
+     * Emitted when the user changed the completion mode by using the
+     * popupmenu.
+     */
+    void completionModeChanged( OGlobalSettings::Completion );
+
+    /**
+     * Emitted before the context menu is displayed.
+     *
+     * The signal allows you to add your own entries into the
+     * the context menu that is created on demand.
+     *
+     * NOTE: Do not store the pointer to the QPopupMenu
+     * provided through since it is created and deleted
+     * on demand.
+     *
+     * @param the context menu about to be displayed
+     */
+    void aboutToShowContextMenu( QPopupMenu* );
+
+public slots:
+
+    /**
+     * Re-implemented for internal reasons. API not changed.
+     */
+    virtual void setReadOnly(bool);
+
+    /**
+     * Iterates through all possible matches of the completed text or
+     * the history list.
+     *
+     * This function simply iterates over all possible matches in case
+     * multimple matches are found as a result of a text completion request.
+     * It will have no effect if only a single match is found.
+     *
+     * @param type The key-binding invoked.
+     */
+    void rotateText( OCompletionBase::KeyBindingType /* type */ );
+
+    /**
+     * See @ref OCompletionBase::setCompletedText.
+     */
+    virtual void setCompletedText( const QString& );
+
+    /**
+     * Sets @p items into the completion-box if @ref completionMode() is
+     * CompletionPopup. The popup will be shown immediately.
+     */
+    void setCompletedItems( const QStringList& items );
+
+    /**
+     * Reimplemented to workaround a buggy QLineEdit::clear()
+     * (changing the clipboard to the text we just had in the lineedit)
+     */
+    virtual void clear();
+    
+protected slots:
+
+    /**
+    * Completes the remaining text with a matching one from
+    * a given list.
+    */
+    virtual void makeCompletion( const QString& );
+
+    /**
+     * @deprecated.  Will be removed in the next major release!
+     */
+    void slotAboutToShow() {}
+
+    /**
+     * @deprecated.  Will be removed in the next major release!
+     */
+    void slotCancelled() {}
+
+protected:
+
+    /**
+    * Re-implemented for internal reasons.  API not affected.
+    *
+    * See @ref QLineEdit::keyPressEvent().
+    */
+    virtual void keyPressEvent( QKeyEvent * );
+
+    /**
+    * Re-implemented for internal reasons.  API not affected.
+    *
+    * See @ref QLineEdit::mousePressEvent().
+    */
+    virtual void mousePressEvent( QMouseEvent * );
+
+    /**
+    * Re-implemented for internal reasons.  API not affected.
+    *
+    * See @ref QWidget::mouseDoubleClickEvent().
+    */
+    virtual void mouseDoubleClickEvent( QMouseEvent * );
+
+    /**
+    * Re-implemented for internal reasons.  API not affected.
+    *
+    * See @ref QLineEdit::createPopupMenu().
+    */
+    virtual QPopupMenu *createPopupMenu();
+
+    /**
+    * Re-implemented to handle URI drops.
+    *
+    * See @ref QLineEdit::dropEvent().
+    */
+    //virtual void dropEvent( QDropEvent * );
+
+    /*
+    * This function simply sets the lineedit text and
+    * highlights the text appropriately if the boolean
+    * value is set to true.
+    *
+    * @param text
+    * @param marked
+    */
+    virtual void setCompletedText( const QString& /*text*/, bool /*marked*/ );
+
+    /**
+     * Reimplemented for internal reasons, the API is not affected.
+     */
+    virtual void create( WId = 0, bool initializeWindow = true,
+                         bool destroyOldWindow = true );
+
+private slots:
+    void completionMenuActivated( int id );
+    void tripleClickTimeout();  // resets possibleTripleClick
+
+private:
+    // Constants that represent the ID's of the popup menu.
+    // TODO: See if we can replace this mess with KActionMenu
+    // in the future though it's working lovely.
+    enum MenuID {
+        Default = 42,
+        NoCompletion,
+        AutoCompletion,
+        ShellCompletion,
+        PopupCompletion,
+        SemiAutoCompletion
+    };
+
+    /**
+     * Initializes variables.  Called from the constructors.
+     */
+    void init();
+
+    /**
+     * Creates the completion box
+     */
+    void makeCompletionBox();
+
+    /**
+     * Checks whether we should/should not consume a key used as
+     * an accelerator.
+     */
+    //bool overrideAccel (const QKeyEvent* e);
+
+    bool m_bEnableMenu;
+
+    bool possibleTripleClick;  // set in mousePressEvent, deleted in tripleClickTimeout
+
+protected:
+    //virtual void virtual_hook( int id, void* data );
+private:
+    class OLineEditPrivate;
+    OLineEditPrivate *d;
+};
+
+#endif