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tdelibs/kdeui/kcombobox.h

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/* This file is part of the KDE libraries
Copyright (c) 2000,2001 Dawit Alemayehu <adawit@kde.org>
Copyright (c) 2000,2001 Carsten Pfeiffer <pfeiffer@kde.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef _KCOMBOBOX_H
#define _KCOMBOBOX_H
#include <tqlineedit.h>
#include <tqcombobox.h>
#include <kcompletion.h>
class TQListBoxItem;
class TQPopupMenu;
class TQLineEdit;
class KCompletionBox;
class KURL;
/**
* @short An enhanced combo box.
*
* A combined button, line-edit and a popup list widget.
*
* \b Detail \n
*
* This widget inherits from TQComboBox 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 change the text completion mode on the fly.
*
* To support these new features KComboBox emits a few additional signals
* such as completion( const TQString& ) and textRotation( KeyBindgingType ).
* The completion signal can be connected to a slot that will assist the user in
* filling out the remaining text while the rotation signal can be used to traverse
* through all possible matches whenever text completion results in multiple matches.
* Additionally, a returnPressed() and a returnPressed( const TQString& )
* signals are emitted when the user presses the Enter/Return key.
*
* KCombobox by default creates a completion object when you invoke the
* completionObject( bool ) member function for the first time or
* explicitly use setCompletionObject( KCompletion*, bool ) to assign your
* own completion object. Additionally, to make this widget more functional,
* KComboBox will by default handle 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
* @p setHandleSignals(bool) or alternatively set the boolean parameter in the
* @p setCompletionObject call to false.
*
* Beware: The completion object can be deleted on you, especially if a call
* such as setEditable(false) is made. Store the pointer at your own risk,
* and consider using TQGuardedPtr<KCompletion>.
*
* The default key-bindings for completion and rotation is determined from the
* global settings in KStdAccel. These values, however, can be overridden
* locally by invoking KCompletionBase::setKeyBinding(). The values can
* easily be reverted back to the default setting, by simply calling
* useGlobalSettings(). An alternate method would be to default individual
* key-bindings by usning setKeyBinding() with the default second argument.
*
* A non-editable combobox only has one completion mode, @p CompletionAuto.
* Unlike an editable combobox the CompletionAuto mode, works by matching
* any typed key with the first letter of entries in the combobox. Please note
* that if you call setEditable( false ) to change an editable combobox to a
* non-editable one, the text completion object associated with the combobox will
* no longer exist unless you created the completion object yourself and assigned
* it to this widget or you called setAutoDeleteCompletionObject( false ). In other
* words do not do the following:
*
* \code
* KComboBox* combo = new KCompletionBox(true, this, "mywidget");
* KCompletion* comp = combo->completionObject();
* combo->setEditable( false );
* comp->clear(); // CRASH: completion object does not exist anymore.
* \endcode
*
*
* A read-only KComboBox will have the same background color as a
* disabled KComboBox, but its foreground color will be the one used for
* the read-write mode. This differs from QComboBox's implementation
* and is done to give visual distinction between the three different modes:
* disabled, read-only, and read-write.
*
* \b Usage \n
*
* To enable the basic completion feature:
*
* \code
* KComboBox *combo = new KComboBox( true, this, "mywidget" );
* KCompletion *comp = combo->completionObject();
* // Connect to the return pressed signal - optional
* connect(combo,TQT_SIGNAL(returnPressed(const TQString&)),comp,TQT_SLOT(addItem(const TQString&)));
*
* // Provide the to be completed strings. Note that those are separate from the combo's
* // contents.
* comp->insertItems( someQStringList );
* \endcode
*
* To use your own completion object:
*
* \code
* KComboBox *combo = new KComboBox( this,"mywidget" );
* KURLCompletion *comp = new KURLCompletion();
* combo->setCompletionObject( comp );
* // Connect to the return pressed signal - optional
* connect(combo,TQT_SIGNAL(returnPressed(const TQString&)),comp,TQT_SLOT(addItem(const TQString&)));
* \endcode
*
* 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:
*
* \code
* // 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 );
* \endcode
*
* @author Dawit Alemayehu <adawit@kde.org>
*/
class KDEUI_EXPORT KComboBox : public TQComboBox, public KCompletionBase
{
Q_OBJECT
Q_PROPERTY( bool autoCompletion READ autoCompletion WRITE setAutoCompletion )
Q_PROPERTY( bool contextMenuEnabled READ isContextMenuEnabled WRITE setContextMenuEnabled )
Q_PROPERTY( bool urlDropsEnabled READ isURLDropsEnabled WRITE setURLDropsEnabled )
Q_PROPERTY( bool trapReturnKey READ trapReturnKey WRITE setTrapReturnKey )
public:
/**
* Constructs 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( TQWidget *parent=0, const char *name=0 );
/**
* Constructs 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, TQWidget *parent=0, const char *name=0 );
/**
* Destructor.
*/
virtual ~KComboBox();
/**
* Sets @p url into the edit field of the combobox. It uses
* 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. 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.
* KURL::prettyURL() is used so that the url is properly decoded
* for displaying.
*/
void insertURL( const TQPixmap& pixmap, const KURL& url, int index = -1 );
/**
* Replaces the item at position @p index with @p url.
* 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.
* KURL::prettyURL() is used so that the url is properly decoded
* for displaying.
*/
void changeURL( const TQPixmap& pixmap, const KURL& url, int index );
/**
* Returns 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 ( lineEdit() ) ? lineEdit()->cursorPosition() : -1; }
/**
* Re-implemented from TQComboBox.
*
* If @p true, the completion mode will be set to automatic.
* Otherwise, it is defaulted to the global setting. This
* method has been replaced by the more comprehensive
* setCompletionMode().
*
* @param autocomplete Flag to enable/disable automatic completion mode.
*/
virtual void setAutoCompletion( bool autocomplete );
/**
* Re-implemented from TQComboBox.
*
* Returns @p true if the current completion mode is set
* to automatic. See its more comprehensive replacement
* completionMode().
*
* @return @p true when completion mode is automatic.
*/
bool autoCompletion() const {
return completionMode() == KGlobalSettings::CompletionAuto;
}
/**
* Enables 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 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.
*/
virtual void setContextMenuEnabled( bool 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
* behavior of TQComboBox 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;
/**
* 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 TQString& text ) const;
/**
* By default, KComboBox recognizes Key_Return and Key_Enter
* and emits the 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 true to make 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.
*/
virtual bool eventFilter( TQObject *, TQEvent * );
/**
* @returns the completion-box, that is used in completion mode
* KGlobalSettings::CompletionPopup and KGlobalSettings::CompletionPopupAuto.
* This method will create a completion-box by calling
* KLineEdit::completionBox, 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.
*/
KCompletionBox * completionBox( bool create = true );
/**
* Re-implemented for internal reasons. API remains unaffected.
* NOTE: Only editable comboboxes can have a line editor. As such
* any attempt to assign a line-edit to a non-editable combobox will
* simply be ignored.
*/
virtual void setLineEdit( TQLineEdit * );
signals:
/**
* Emitted when the user presses the Enter key.
*
* Note that this signal is only emitted when the 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
* returnPressed() except it contains the current text as its argument.
*
* Note that this signal is only emitted when the
* widget is editable.
*/
void returnPressed( const TQString& );
/**
* Emitted when the completion key is pressed.
*
* The argument is the current text being edited.
*
* Note that this signal is @em not available when the widget is non-editable
* or the completion mode is set to @p KGlobalSettings::CompletionNone.
*/
void completion( const TQString& );
/**
* Emitted when the shortcut for substring completion is pressed.
*/
void substringCompletion( const TQString& );
/**
* 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
* @p setKeyBinding() for details.
*
* Note that this signal is @em NOT emitted if the completion
* mode is set to CompletionNone.
*/
void textRotation( KCompletionBase::KeyBindingType );
/**
* Emitted whenever the completion mode is changed by the user
* through the context menu.
*/
void completionModeChanged( KGlobalSettings::Completion );
/**
* Emitted before the context menu is displayed.
*
* The signal allows you to add your own entries into the context menu.
* Note that you MUST NOT store the pointer to the TQPopupMenu since it is
* created and deleted on demand. Otherwise, you can crash your app.
*
* @param p the context menu about to be displayed
*/
void aboutToShowContextMenu( TQPopupMenu * p );
public slots:
/**
* Iterates 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 TQComboBox::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 a re-implementation of @p setCompletedText.
*/
virtual void setCompletedText( const TQString& );
/**
* Sets @p items into the completion-box if completionMode() is
* CompletionPopup. The popup will be shown immediately.
*/
void setCompletedItems( const TQStringList& items );
/**
* Selects the first item that matches @p item. If there is no such item,
* it is inserted at position @p index if @p insert is true. Otherwise,
* no item is selected.
*/
void setCurrentItem( const TQString& item, bool insert = false, int index = -1 );
/**
* Simply calls QComboBox' implementation. Only here to not become
* shadowed.
*/
void setCurrentItem(int index) { TQComboBox::setCurrentItem(index); }
protected slots:
/**
* @deprecated
*/
virtual void itemSelected( TQListBoxItem* ) {}
/**
* 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 TQString& );
protected:
/*
* 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 TQString& /* */, bool /*marked*/ );
/**
* Reimplemented for internal reasons, the API is not affected.
*/
virtual void create( WId = 0, bool initializeWindow = true,
bool destroyOldWindow = true );
virtual void wheelEvent( TQWheelEvent *ev );
private slots:
void lineEditDeleted();
private:
/**
* Initializes the variables upon construction.
*/
void init();
bool m_bEnableMenu; // ### BCI: unused, remove in KDE4
bool m_trapReturnKey; // ### BCI: unused, remove in KDE4
protected:
virtual void virtual_hook( int id, void* data );
private:
class KComboBoxPrivate;
KComboBoxPrivate* const d;
};
class KPixmapProvider;
/**
* @short A combobox for offering a history and completion
*
* 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.
*
* KHistoryCombo obeys the HISTCONTROL environment variable to determine
* whether duplicates in the history should be tolerated in
* addToHistory() or not. During construction of KHistoryCombo,
* duplicates will be disabled when HISTCONTROL is set to "ignoredups" or
* "ignoreboth". Otherwise, duplicates are enabled by default.
*
* @author Carsten Pfeiffer <pfeiffer@kde.org>
*/
class KDEUI_EXPORT KHistoryCombo : public KComboBox
{
Q_OBJECT
Q_PROPERTY( TQStringList 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.
* Completion will be used automatically for the items in the combo.
*
* The insertion-policy is set to NoInsertion, you have to add the items
* yourself via the slot addToHistory. If you want every item added,
* use
*
* \code
* connect( combo, TQT_SIGNAL( activated( const TQString& )),
* combo, TQT_SLOT( addToHistory( const TQString& )));
* \endcode
*
* Use TQComboBox::setMaxCount() to limit the history.
*
* @p parent the parent object of this widget.
* @p name the name of this widget.
*/
KHistoryCombo( TQWidget *parent = 0L, const char *name = 0L );
// ### merge these two constructors
/**
* Same as the previous constructor, but additionally has the option
* to specify whether you want to let KHistoryCombo handle completion
* or not. If set to @p true, KHistoryCombo will sync the completion to the
* contents of the combobox.
*/
KHistoryCombo( bool useCompletion,
TQWidget *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 maxCount()
*
* @see historyItems
*/
inline void setHistoryItems( TQStringList items ) {
setHistoryItems(items, false);
}
/**
* Inserts @p items into the combobox. @p items might get
* truncated if it is longer than 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
* \code
* KConfig *config = kapp->config();
* TQStringList 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 );
* \endcode
*
* 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( TQStringList items, bool setCompletionList );
/**
* Returns the list of history items. Empty, when this is not a read-write
* combobox.
*
* @see setHistoryItems
*/
TQStringList historyItems() const;
/**
* Removes all items named @p item.
*
* @return @p true if at least one item was removed.
*
* @see addToHistory
*/
bool removeFromHistory( const TQString& item );
/**
* Sets a pixmap provider, so that items in the combobox can have a pixmap.
* KPixmapProvider is just an abstract class with the one pure virtual
* method 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 KURLPixmapProvider from libkio,
* which uses 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; }
/**
* Resets the current position of the up/down history. Call this
* when you manually call setCurrentItem() or clearEdit().
*/
void reset() { slotReset(); }
public slots:
/**
* Adds an item to the end of the history list and to the completion list.
* If 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 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 TQComboBox::setDuplicatesEnabled
*/
void addToHistory( const TQString& item );
/**
* Clears the history and the completion list.
*/
void clearHistory();
signals:
/**
* Emitted when the history was cleared by the entry in the popup menu.
*/
void cleared();
protected:
/**
* Handling key-events, the shortcuts to rotate the items.
*/
virtual void keyPressEvent( TQKeyEvent * );
/**
* Handling wheel-events, to rotate the items.
*/
virtual void wheelEvent( TQWheelEvent *ev );
/**
* Inserts @p items into the combo, honoring pixmapProvider()
* Does not update the completionObject.
*
* Note: duplicatesEnabled() is not honored here.
*
* Called from setHistoryItems() and setPixmapProvider()
*/
void insertItems( const TQStringList& items );
/**
* @returns if we can modify the completion object or not.
*/
bool useCompletion() const { return compObj(); }
private slots:
/**
* Resets the iterate index to -1
*/
void slotReset();
/**
* Called from the popupmenu,
* calls clearHistory() and emits cleared()
*/
void slotClear();
/**
* Appends our own context menu entry.
*/
void addContextMenuItems( TQPopupMenu* );
private:
void init( bool useCompletion );
void rotateUp();
void rotateDown();
/**
* The current position (index) in the combobox, used for Up and Down
*/
int myIterateIndex;
/**
* The text typed before Up or Down was pressed.
*/
TQString 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;
protected:
virtual void virtual_hook( int id, void* data );
private:
class KHistoryComboPrivate;
KHistoryComboPrivate* const d;
};
#endif