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127 lines
4.3 KiB
C++
127 lines
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsIComboboxControlFrame_h___
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#define nsIComboboxControlFrame_h___
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#include "nsQueryFrame.h"
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#include "nsFont.h"
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class nsPresContext;
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class nsString;
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class nsIContent;
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class nsCSSFrameConstructor;
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/**
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* nsIComboboxControlFrame is the common interface for frames of form controls. It
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* provides a uniform way of creating widgets, resizing, and painting.
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* @see nsLeafFrame and its base classes for more info
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*/
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class nsIComboboxControlFrame : public nsQueryFrame
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{
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public:
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NS_DECL_QUERYFRAME_TARGET(nsIComboboxControlFrame)
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/**
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* Indicates whether the list is dropped down
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*/
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virtual PRBool IsDroppedDown() = 0;
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/**
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* Shows or hides the drop down
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*/
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virtual void ShowDropDown(PRBool aDoDropDown) = 0;
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/**
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* Gets the Drop Down List
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*/
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virtual nsIFrame* GetDropDown() = 0;
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/**
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* Sets the Drop Down List
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*/
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virtual void SetDropDown(nsIFrame* aDropDownFrame) = 0;
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/**
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* Tells the combobox to roll up
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*/
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virtual void RollupFromList() = 0;
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/**
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* Redisplay the selected text (will do nothing if text has not changed).
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* This method might destroy this frame or any others that happen to be
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* around. It might even run script.
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*/
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NS_IMETHOD RedisplaySelectedText() = 0;
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/**
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* Method for the listbox to set and get the recent index
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*/
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virtual PRInt32 UpdateRecentIndex(PRInt32 aIndex) = 0;
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/**
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*
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*/
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virtual void AbsolutelyPositionDropDown() = 0;
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/**
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* Notification that the content has been reset
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*/
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virtual void OnContentReset() = 0;
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/**
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* This returns the index of the item that is currently being displayed
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* in the display area. It may differ from what the currently Selected index
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* is in in the dropdown.
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*
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* Detailed explanation:
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* When the dropdown is dropped down via a mouse click and the user moves the mouse
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* up and down without clicking, the currently selected item is being tracking inside
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* the dropdown, but the combobox is not being updated. When the user selects items
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* with the arrow keys, the combobox is being updated. So when the user clicks outside
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* the dropdown and it needs to roll up it has to decide whether to keep the current
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* selection or not. This method is used to get the current index in the combobox to
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* compare it to the current index in the dropdown to see if the combox has been updated
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* and that way it knows whether to "cancel" the current selection residing in the
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* dropdown. Or whether to leave the selection alone.
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*/
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virtual PRInt32 GetIndexOfDisplayArea() = 0;
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};
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#endif
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