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89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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 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 bool 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(bool 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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* 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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