KHistoryComboBox

KDE 4.2 PyKDE API Reference

- KDE's Python API

# KHistoryComboBox Class Reference

`from PyKDE4.kdeui import *`

Inherits: KComboBox → QComboBox → QWidget → QObject

## Detailed Description

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.

KHistoryComboBox obeys the HISTCONTROL environment variable to determine whether duplicates in the history should be tolerated in addToHistory() or not. During construction of KHistoryComboBox, duplicates will be disabled when HISTCONTROL is set to "ignoredups" or "ignoreboth". Otherwise, duplicates are enabled by default.

Author:
  Carsten Pfeiffer <pfeiffer@kde.org>

## Signals
| cleared ()
## Methods
| __init__ (self, QWidget parent=0)
| __init__ (self, bool useCompletion, QWidget parent=0)
| __init__ (self, KHistoryComboBox a0)
| addToHistory (self, QString item)
| clearHistory (self)
| cleared (self)
QStringList | historyItems (self)
| insertItems (self, QStringList items)
| keyPressEvent (self, QKeyEvent a0)
KPixmapProvider | pixmapProvider (self)
bool | removeFromHistory (self, QString item)
| reset (self)
| setHistoryItems (self, QStringList items)
| setHistoryItems (self, QStringList items, bool setCompletionList)
| setPixmapProvider (self, KPixmapProvider prov)
bool | useCompletion (self)
| wheelEvent (self, QWheelEvent ev)

## Method Documentation

__init__ | ( | self, |
|  | QWidget | parent=0
| ) |  |  |

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 NoInsert, you have to add the items yourself via the slot addToHistory. If you want every item added, use

     connect( combo, SIGNAL( activated( const QString& )),
              combo, SLOT( addToHistory( const QString& )));

Use QComboBox.setMaxCount() to limit the history.

parent the parent object of this widget.

__init__ | ( | self, |
|  | bool | useCompletion,
|  | QWidget | parent=0
| ) |  |  |

Same as the previous constructor, but additionally has the option to specify whether you want to let KHistoryComboBox handle completion or not. If set to true, KHistoryComboBox will sync the completion to the contents of the combobox.

__init__ | ( | self, |
|  | KHistoryComboBox | a0
| ) |  |  |

addToHistory | ( | self, |
|  | QString | item
| ) |  |  |

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 item, it will not be inserted again.

If duplicatesEnabled() is false, any equal existing item will be removed before 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 also:
  removeFromHistory

See also:
  QComboBox.setDuplicatesEnabled

clearHistory | ( |  | self ) |

Clears the history and the completion list.

cleared | ( |  | self ) |

Emitted when the history was cleared by the entry in the popup menu.

Signal syntax:
  `QObject.connect(source, SIGNAL("cleared()"), target_slot)`

QStringList historyItems | ( |  | self ) |

Returns the list of history items. Empty, when this is not a read-write combobox.

See also:
  setHistoryItems

insertItems | ( | self, |
|  | QStringList | items
| ) |  |  |

Inserts items into the combo, honoring pixmapProvider() Does not update the completionObject.

Note: duplicatesEnabled() is not honored here.

Called from setHistoryItems() and setPixmapProvider()

keyPressEvent | ( | self, |
|  | QKeyEvent | a0
| ) |  |  |

Handling key-events, the shortcuts to rotate the items.

KPixmapProvider pixmapProvider | ( |  | self ) |

Returns:
  the current pixmap provider.

See also:
  setPixmapProvider

See also:
  KPixmapProvider

bool removeFromHistory | ( | self, |
|  | QString | item
| ) |  |  |

Removes all items named item.

Returns:
  true if at least one item was removed.

See also:
  addToHistory

reset | ( |  | self ) |

Resets the current position of the up/down history. Call this when you manually call setCurrentItem() or clearEdit().

setHistoryItems | ( | self, |
|  | QStringList | items
| ) |  |  |

Inserts items into the combobox. items might get truncated if it is longer than maxCount()

See also:
  historyItems

setHistoryItems | ( | self, |
|  | QStringList | items,
|  | bool | setCompletionList
| ) |  |  |

Inserts items into the combobox. items might get truncated if it is longer than maxCount()

Set setCompletionList to true, if you don't have a list of completions. This tells KHistoryComboBox 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

     KConfigGroup config(KGlobal.config(), "somegroup");

     // load the history and completion list after creating the history combo
     QStringList list;
     list = config.readEntry("Completion list", QStringList());
     combo->completionObject()->setItems(list);
     list = config.readEntry("History list", QStringList());
     combo->setHistoryItems(list);

     [...]

     // save the history and completion list when the history combo is
     // destroyed
     QStringList list;
     KConfigGroup config(KGlobal.config(), "somegroup");
     list = combo->completionObject()->items();
     config.writeEntry("Completion list", list);
     list = combo->historyItems();
     config.writeEntry("History list", list);

Be sure to use different names for saving with KConfig if you have more than one KHistoryComboBox.

Note: When 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 also:
  historyItems

See also:
  KComboBox.completionObject

See also:
  KCompletion.setItems

See also:
  KCompletion.items

setPixmapProvider | ( | self, |
|  | KPixmapProvider | prov
| ) |  |  |

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 KHistoryComboBoxBox. Implement it to return your own custom pixmaps, or use the KUrlPixmapProvider from libkio, which uses KMimeType.pixmapForUrl to resolve icons.

Set prov to 0 if you want to disable pixmaps. Default no pixmaps.

See also:
  pixmapProvider

bool useCompletion | ( |  | self ) |

Returns:
  if we can modify the completion object or not.

wheelEvent | ( | self, |
|  | QWheelEvent | ev
| ) |  |  |

Handling wheel-events, to rotate the items.