gecko-dev/layout/forms/nsIComboboxControlFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef nsIComboboxControlFrame_h___
#define nsIComboboxControlFrame_h___
#include "nsISupports.h"
#include "nsFont.h"
class nsFormFrame;
class nsIPresContext;
class nsString;
class nsIContent;
class nsVoidArray;
class nsCSSFrameConstructor;
// IID for the nsIComboboxControlFrame class
#define NS_ICOMBOBOXCONTROLFRAME_IID \
{ 0x6961f791, 0xa662, 0x11d2, \
{ 0x8d, 0xcf, 0x0, 0x60, 0x97, 0x3, 0xc1, 0x4e } }
/**
* nsIComboboxControlFrame is the common interface for frames of form controls. It
* provides a uniform way of creating widgets, resizing, and painting.
* @see nsLeafFrame and its base classes for more info
*/
class nsIComboboxControlFrame : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_ICOMBOBOXCONTROLFRAME_IID)
/**
* Indicates whether the list is dropped down
*
*/
NS_IMETHOD IsDroppedDown(PRBool * aDoDropDown) = 0;
/**
* Shows or hides the drop down
*
*/
NS_IMETHOD ShowDropDown(PRBool aDoDropDown) = 0;
/**
* Gets the Drop Down List
*
*/
NS_IMETHOD GetDropDown(nsIFrame** aDropDownFrame) = 0;
/**
* Sets the Drop Down List
*
*/
NS_IMETHOD SetDropDown(nsIFrame* aDropDownFrame) = 0;
/**
* Notifies the Combobox the List was selected
*
*/
NS_IMETHOD ListWasSelected(nsIPresContext* aPresContext, PRBool aForceUpdate, PRBool aSendEvent) = 0;
/**
* Asks the Combobox to update the display frame
* aDoDispatchEvent - indicates whether an event should be dispatched to the DOM
* aForceUpdate - indicates whether the indexx and the text value should both be
* whether the index has changed or not.
*
*/
NS_IMETHOD UpdateSelection(PRBool aDoDispatchEvent, PRBool aForceUpdate, PRInt32 aNewIndex) = 0;
/**
* Asks the Combobox to update the display frame when the selection has
* changed
*
*/
NS_IMETHOD SelectionChanged() = 0;
/**
*
*/
NS_IMETHOD AbsolutelyPositionDropDown() = 0;
/**
*
*/
NS_IMETHOD GetAbsoluteRect(nsRect* aRect) = 0;
/**
*
*/
NS_IMETHOD MakeSureSomethingIsSelected(nsIPresContext* aPresContext) = 0;
/**
*
*/
NS_IMETHOD SetFrameConstructor(nsCSSFrameConstructor *aConstructor) = 0;
/**
* This returns the index of the item that is currently being displayed
* in the display area. It may differ from what the currently Selected index
* is in in the dropdown.
*
* Detailed explanation:
* When the dropdown is dropped down via a mouse click and the user moves the mouse
* up and down without clicking, the currently selected item is being tracking inside
* the dropdown, but the combobox is not being updated. When the user selects items
* with the arrow keys, the combobox is being updated. So when the user clicks outside
* the dropdown and it needs to roll up it has to decide whether to keep the current
* selection or not. This method is used to get the current index in the combobox to
* compare it to the current index in the dropdown to see if the combox has been updated
* and that way it knows whether to "cancel" the the current selection residing in the
* dropdown. Or whether to leave the selection alone.
*/
NS_IMETHOD GetIndexOfDisplayArea(PRInt32* aSelectedIndex) = 0;
};
#endif