/* This file is part of the KDE libraries
Copyright (c) 2000 Dawit Alemayehu <adawit@kde.org>
2000 Carsten Pfeiffer <pfeiffer@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License (LGPL) 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 _KCOMBOBOX_H
#define _KCOMBOBOX_H
#include <qlineedit.h>
#include <qcombobox.h>
#include <kcompletion.h>
class QListBoxItem;
class QLineEdit;
class KURL;
/**
* A combined button, line-edit and a popup list widget.
*
* @sect Detail
*
* This widget inherits from @ref QComboBox and implements
* the following additional functionalities: a completion
* object that provides both automatic and manual text
* completion as well as text rotation 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 @ref KComboBox also emits a few
* more additional signals as well. The main ones are the
* @ref completion( const QString& ) and @ref textRotation( KeyBindgingType )
* signals. The completion signal is intended to be connected to a slot
* that will assist the user in filling out the remaining text while
* the rotation signals is intended to be used to trasverse through all
* possible matches whenever text completion results in multiple matches.
* The @ref returnPressed() and @ref returnPressed( const QString& )
* signal is emitted when the user presses the Enter/Return key.
*
* 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( KCompletion*, bool ) to assign your
* own completion object. Additionally, to make this widget more functional,
* @ref KComboBox will by default handle the text rotation and completion
* events internally whenever a completion object is created through either
* one of the methods mentioned above. If you do not need this functionality,
* simply use @ref KCompletionBase::setHandleSignals( bool ) or alternatively
* set the boolean parameter in the above methods to FALSE.
*
* The default key-bindings for completion and rotation is determined
* from the global settings in @ref KStdAccel. These values, however,
* can be overriden locally by invoking @ref KCompletionBase::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 this widget is not editable ( i.e. select-only ), then only
* one completion mode, @p CompletionAuto, will work. All the other modes are
* simply ignored. The @p CompletionAuto mode in this case allows you to
* automatically select an item from the list by trying to match the pressed
* keycode with the first letter of the enteries in the combo box.
*
* @sect Example
*
* To enable the basic completion feature:
*
* <pre>
* KComboBox *combo = new KComboBox( true, this, "mywidget" );
* KCompletion *comp = combo->completionObject();
* // Connect to the return pressed signal - optional
* connect(combo,SIGNAL(returnPressed(const QString&)),comp,SLOT(addItem(const QString&));
* </pre>
*
* To use your own completion object:
*
* <pre>
* KComboBox *combo = new KComboBox( this,"mywidget" );
* KURLCompletion *comp = new KURLCompletion();
* combo->setCompletionObject( comp );
* // Connect to the return pressed signal - optional
* connect(combo,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 );
*
* Miscellaneous function calls:
*
* <pre>
* // Tell the widget not to handle completion and rotation
* combo->setHandleSignals( false );
* // Set your own completion key for manual completions.
* combo->setKeyBinding( KCompletionBase::TextCompletion, Qt::End );
* // Hide the context (popup) menu
* combo->setContextMenuEnabled( false );
* // Temporarly disable signal emition
* combo->disableSignals();
* // Default the all key-bindings to their system-wide settings.
* combo->useGlobalKeyBindings();
* </pre>
*
* @short An enhanced combo box.
* @author Dawit Alemayehu <adawit@kde.org>
*/
class KComboBox : public QComboBox, public KCompletionBase
{
Q_OBJECT
Q_PROPERTY( bool autoCompletion READ autoCompletion WRITE setAutoCompletion )
Q_PROPERTY( bool contextMenuEnabled READ isContextMenuEnabled WRITE setContextMenuEnabled )
public:
/**
* Construct a read-only or rather select-only combo box with a
* parent object and a name.
*
* @param parent The parent object of this widget
* @param name The name of this widget
*/
KComboBox( QWidget *parent=0, const char *name=0 );
/**
* Construct a "read-write" or "read-only" combo box depending on
* the value of the first argument( @p rw ) with a parent, a
* name.
*
* @param rw When @p true, widget will be editable.
* @param parent The parent object of this widget.
* @param name The name of this widget.
*/
KComboBox( bool rw, QWidget *parent=0, const char *name=0 );
/**
* Destructor.
*/
virtual ~KComboBox();
/**
* Sets @p url into the edit field of the combobox. It uses
* @ref KURL::prettyURL() so that the url is properly decoded for
* displaying.
*/
void setEditURL( const KURL& url );
/**
* Inserts @p url at position @p index into the combobox. The item will
* be appended if @p index is negative. @ref KURL::prettyURL() is used
* so that the url is properly decoded for displaying.
*/
void insertURL( const KURL& url, int index = -1 );
/**
* Inserts @p url with the pixmap &p pixmap at position @p index into
* the combobox. The item will be appended if @p index is negative.
* @ref KURL::prettyURL() is used so that the url is properly decoded
* for displaying.
*/
void insertURL( const QPixmap& pixmap, const KURL& url, int index = -1 );
/**
* Replaces the item at position @p index with @p url.
* @ref KURL::prettyURL() is used so that the url is properly decoded
* for displaying.
*/
void changeURL( const KURL& url, int index );
/**
* Replaces the item at position @p index with @p url and pixmap @p pixmap.
* @ref KURL::prettyURL() is used so that the url is properly decoded
* for displaying.
*/
void changeURL( const QPixmap& pixmap, const KURL& url, int index );
/**
* Retreive the current cursor position.
*
* This method always returns a -1 if the combo-box is @em not
* editable (read-write).
*
* @return Current cursor position.
*/
int cursorPosition() const { return ( m_pEdit ) ? m_pEdit->cursorPosition() : -1; }
/**
* Re-implemented from @ref QComboBox.
*
* If @p true, the completion mode will be set to automatic.
* Otherwise, it is defaulted to the gloabl setting. This
* methods has been replaced by the more comprehensive
* @ref setCompletionMode().
*
* @param autocomplete Flag to enable/disable automatic completion mode.
*/
virtual void setAutoCompletion( bool autocomplete );
/**
* Re-implemented from QComboBox.
*
* Returns @p true if the current completion mode is set
* to automatic. See its more comprehensive replacement
* @ref completionMode().
*
* @return @p true when completion mode is automatic.
*/
bool autoCompletion() const { return completionMode() == KGlobalSettings::CompletionAuto; }
/**
* Enable or disable the popup (context) menu.
*
* This method only works if this widget is editable, i.e.
* read-write and allows you to enable/disable the context
* menu. It does nothing if invoked for a none-editable
* combo-box. Note that by default the mode changer item
* is made visiable whenever the context menu is enabled.
* Use @ref hideModechanger() if you want to hide this
* item. Also by default, the context menu is created if
* this widget is editable. Call this function with the
* argument set to false to disable the popup menu.
*
* @param showMenu If @p true, show the context menu.
* @param showMode If @p true, show the mode changer.
*/
virtual void setContextMenuEnabled( bool showMenu );
/**
* Returns @p true when the context menu is enabled.
*
* @return @p true if context menu is enabled.
*/
bool isContextMenuEnabled() const { return m_bEnableMenu; }
/**
* Returns @p true if the combo-box is editable.
*
* @return @p true if combo is editable.
*/
bool isEditable() const { return editable(); }
/**
* Convenience method which iterates over all items and checks if
* any of them is equal to @p text.
*
* If @p text is an empty string, @p false
* is returned.
*
* @return @p true if an item with the string @p text is in the combobox.
*/
bool contains( const QString& text ) const;
/**
* By default, @ref KComboBox recognizes Key_Return and 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 equal to @p true to make @ref KComboBox
* stop these
* events. The signals will still be emitted of course.
*
* Only affects read-writable comboboxes.
*
* @see setTrapReturnKey()
*/
void setTrapReturnKey( bool trap );
/**
* @return @p true if keyevents of Key_Return or 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 * );
signals:
/**
* Emitted when the user presses the Enter key.
*
* Note that this signal is only
* emitted if this widget is editable.
*/
void returnPressed();
/**
* Emitted when the user presses
* the Enter key.
*
* The argument is the current
* text being edited. This signal is just like
* @ref returnPressed() except it contains the
* current text as its argument.
*
* Note that this signal is only emitted if this
* widget is editable.
*/
void returnPressed( const QString& );
/**
* This signal is emitted when the completion key
* is pressed.
*
* The argument is the current text
* being edited.
*
* Note that this signal is @em not available if this
* widget is non-editable or the completion mode is
* set to @p KGlobalSettings::CompletionNone.
*/
void completion( const QString& );
/**
* Emitted when the text rotation key-bindings are pressed.
*
* The argument indicates which key-binding was pressed.
* In this case this can be either one of four values:
* @p PrevCompletionMatch, @p NextCompletionMatch, @p RotateUp or
* @p RotateDown. See @ref KCompletionBase::setKeyBinding() for
* details.
*
* Note that this signal is @em NOT emitted if the completion
* mode is set to CompletionNone.
*/
void textRotation( KCompletionBase::KeyBindingType );
/**
* Emitted when the user changed the completion mode by using the
* popupmenu.
*/
void completionModeChanged( KGlobalSettings::Completion );
public slots:
/**
* Iterate through all possible matches of the completed text
* or the history list.
*
* Depending on the value of the argument, this function either
* iterates through the history list of this widget or the all
* possible matches in whenever multiple matches result from a
* text completion request. Note that the all-possible-match
* iteration will not work if there are no previous matches, i.e.
* no text has been completed and the *nix shell history list
* rotation is only available if the insertion policy for this
* widget is set either @p QComobBox::AtTop or @p QComboBox::AtBottom.
* For other insertion modes whatever has been typed by the user
* when the rotation event was initiated will be lost.
*
* @param type The key-binding invoked.
*/
void rotateText( KCompletionBase::KeyBindingType /* type */ );
/*
* Sets the completed text in the line-edit appropriately.
*
* This function is an implementation for @ref KCompletionBase::setCompletedText.
* It is provided to allow outside
*
*/
virtual void setCompletedText( const QString& );
protected slots:
/**
* Deals with highlighting the seleted item when
* return is pressed in the list box (editable-mode only).
*/
virtual void itemSelected( QListBoxItem* );
/**
* Completes text according to the completion mode.
*
* Note: this method is @p not invoked if the completion mode is
* set to CompletionNone. Also if the mode is set to @p CompletionShell
* and multiple matches are found, this method will complete the
* text to the first match with a beep to inidicate that there are
* more matches. Then any successive completion key event iterates
* through the remaining matches. This way the rotation functionality
* is left to iterate through the list as usual.
*/
virtual void makeCompletion( const QString& );
protected:
/**
* @reimplemented
*/
virtual void keyPressEvent ( QKeyEvent* );
/*
* This function simply sets the lineedit text and
* highlights the text appropriately if the boolean
* value is set to true.
*
* @param
* @param
*/
virtual void setCompletedText( const QString& /* */, bool /*marked*/ );
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 this is working lovely.
enum MenuID {
Default=0,
Cut,
Copy,
Paste,
Clear,
Unselect,
SelectAll,
NoCompletion,
AutoCompletion,
ShellCompletion,
SemiAutoCompletion
};
/**
* Initializes the variables upon construction.
*/
void init();
// Flag that indicates whether we enable/disable
// the context (popup) menu.
bool m_bEnableMenu;
// Pointer to the line editor.
QGuardedPtr<QLineEdit> m_pEdit;
// indicating if we should stop return-key events from propagating
bool m_trapReturnKey;
class KComboBoxPrivate;
KComboBoxPrivate *d;
};
class KPixmapProvider;
/**
* A combobox which implements a history like a unix shell. You can navigate
* through all the items by using the Up or Down arrows (configurable of
* course). Additionally, weighted completion is available. So you should
* load and save the completion list to preserve the weighting between
* sessions.
*
* @author Carsten Pfeiffer <pfeiffer@kde.org>
* @short A combobox for offering a history and completion
*/
class KHistoryCombo : public KComboBox
{
Q_OBJECT
Q_PROPERTY( QStringList historyItems READ historyItems WRITE setHistoryItems )
public:
/**
* Constructs a "read-write" combobox. A read-only history combobox
* doesn't make much sense, so it is only available as read-write.
*
* The insertion-policy is set to NoInsertion, you have to add the items
* yourself via the slot @ref addToHistory. If you want every item added,
* use
*
* <pre>
* connect( combo, SIGNAL( activated( const QString& )),
* combo, SLOT( addToHistory( const QString& )));
* </pre>
*
* Use @ref QComboBox::setMaxCount() to limit the history.
*
* @p parent the parent object of this widget.
* @p name the name of this widget.
*/
KHistoryCombo( QWidget *parent = 0L, const char *name = 0L );
/**
* Destructs the combo, the completion-object and the pixmap-provider
*/
~KHistoryCombo();
/**
* Inserts @p items into the combobox. @p items might get
* truncated if it is longer than @ref maxCount()
*
* @see #historyItems
*/
inline void setHistoryItems( QStringList items ) {
setHistoryItems(items, false);
}
/**
* Inserts @p items into the combobox. @p items might get
* truncated if it is longer than @ref maxCount()
*
* Set @p setCompletionList to true, if you don't have a list of
* completions. This tells KHistoryCombo to use all the items for the
* completion object as well.
* You won't have the benefit of weighted completion though, so normally
* you should do something like
* <pre>
* KConfig *config = kapp->config();
* QStringList list;
*
* // load the history and completion list after creating the history combo
* list = config->readListEntry( "Completion list" );
* combo->completionObject()->setItems( list );
* list = config->readListEntry( "History list" );
* combo->setHistoryItems( list );
*
* [...]
*
* // save the history and completion list when the history combo is
* // destroyed
* list = combo->completionObject()->items()
* config->writeEntry( "Completion list", list );
* list = combo->historyItems();
* config->writeEntry( "History list", list );
* </pre>
*
* Be sure to use different names for saving with KConfig if you have more
* than one KHistoryCombo.
*
* Note: When @p setCompletionList is true, the items are inserted into the
* KCompletion object with mode KCompletion::Insertion and the mode is set
* to KCompletion::Weighted afterwards.
*
* @see #historyItems
* @see KComboBox::completionObject
* @see KCompletion::setItems
* @see KCompletion::items
*/
void setHistoryItems( QStringList items, bool setCompletionList );
/**
* Returns the list of history items. Empty, when this is not a read-write
* combobox.
*
* @see #setHistoryItems
*/
QStringList historyItems() const;
/**
* Remove all items named @p item.
*
* @return @p true if at least one item was removed.
*
* @see #addToHistory
*/
bool removeFromHistory( const QString& item );
/**
* Sets a pixmap provider, so that items in the combobox can have a pixmap.
* @ref KPixmapProvider is just an abstract class with the one pure virtual
* method @ref KPixmapProvider::pixmapFor(). This method is called whenever
* an item is added to the KHistoryComboBox. Implement it to return your
* own custom pixmaps, or use the @ref KURLPixmapProvider from libkio,
* which uses @ref KMimeType::pixmapForURL to resolve icons.
*
* Set @p prov to 0L if you want to disable pixmaps. Default no pixmaps.
*
* @see #pixmapProvider
*/
void setPixmapProvider( KPixmapProvider *prov );
/**
* @returns the current pixmap provider.
* @see #setPixmapProvider
* @see KPixmapProvider
*/
KPixmapProvider * pixmapProvider() const { return myPixProvider; }
public slots:
/**
* Adds an item to the end of the history list and to the completion list.
* If @ref maxCount() is reached, the first item of the list will be
* removed.
*
* If the last inserted item is the same as @p item, it will not be
* inserted again.
*
* If @ref duplicatesEnabled() is false, any equal existing item will be
* removed before @p item is added.
*
* Note: By using this method and not the Q and KComboBox insertItem()
* methods, you make sure that the combobox stays in sync with the
* completion. It would be annoying if completion would give an item
* not in the combobox, and vice versa.
*
* @see #removeFromHistory
* @see QComboBox::setDuplicatesEnabled
*/
void addToHistory( const QString& item );
/**
* Clears the history and the completion list.
*/
void clearHistory();
protected:
/**
* Handling key-events, the shortcuts to rotate the items.
*/
virtual void keyPressEvent( QKeyEvent * );
/**
* Inserts @p items into the combo, honouring @ref pixmapProvider()
* Does not update the completionObject.
*
* Note: @ref duplicatesEnabled() is not honored here.
*
* Called from @ref setHistoryItems() and @ref setPixmapProvider()
*/
void insertItems( const QStringList& items );
private slots:
/**
* resets the iterate index to -1
*/
void slotReset();
private:
/**
* the current position (index) in the combobox, used for Up and Down
*/
int myIterateIndex;
/**
* The text typed before Up or Down was pressed.
*/
QString myText;
/**
* Indicates that the user at least once rotated Up through the entire list
* Needed to allow going back after rotation.
*/
bool myRotated;
KPixmapProvider *myPixProvider;
private:
class KHistoryComboPrivate;
KHistoryComboPrivate *d;
};
#endif
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