gecko/layout/base/nsICaret.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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 the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* the caret is the text cursor used, e.g., when editing */
#ifndef nsICaret_h__
#define nsICaret_h__
#include "nsISupports.h"
#include "nsCOMPtr.h"
#include "nsCoord.h"
#include "nsFrameSelection.h"
struct nsRect;
struct nsPoint;
class nsIRenderingContext;
class nsIFrame;
class nsIView;
class nsIPresShell;
class nsISelection;
class nsIDOMNode;
// IID for the nsICaret interface
// 6226083a-84e4-4177-94a0-f3b399dfeebf
#define NS_ICARET_IID \
{ 0x6226083a, 0x84e4, 0x4177, \
{ 0x94, 0xa0, 0xf3, 0xb3, 0x99, 0xdf, 0xee, 0xbf } }
class nsICaret: public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_ICARET_IID)
enum EViewCoordinates {
eTopLevelWindowCoordinates,
eRenderingViewCoordinates,
eClosestViewCoordinates,
eIMECoordinates
};
NS_IMETHOD Init(nsIPresShell *inPresShell) = 0;
NS_IMETHOD Terminate() = 0;
NS_IMETHOD GetCaretDOMSelection(nsISelection **aDOMSel) = 0;
NS_IMETHOD SetCaretDOMSelection(nsISelection *aDOMSel) = 0;
/** SetCaretVisible will set the visibility of the caret
* @param inMakeVisible PR_TRUE to show the caret, PR_FALSE to hide it
*/
NS_IMETHOD SetCaretVisible(PRBool inMakeVisible) = 0;
/** GetCaretVisible will get the visibility of the caret
* @param inMakeVisible PR_TRUE it is shown, PR_FALSE it is hidden
*/
NS_IMETHOD GetCaretVisible(PRBool *outMakeVisible) = 0;
/** SetCaretReadOnly set the appearance of the caret
* @param inMakeReadonly PR_TRUE to show the caret in a 'read only' state,
* PR_FALSE to show the caret in normal, editing state
*/
NS_IMETHOD SetCaretReadOnly(PRBool inMakeReadonly) = 0;
virtual PRBool GetCaretReadOnly() = 0;
/** GetCaretCoordinates
* Get the position of the caret in coordinates relative to the typed
* specified (aRelativeToType).
* If the selection is collapsed, this returns the caret location
* and true in outIsCollapsed.
* If the selection is not collapsed, this returns the location of the focus pos,
* and false in outIsCollapsed.
*/
NS_IMETHOD GetCaretCoordinates(EViewCoordinates aRelativeToType,
nsISelection *aDOMSel,
nsRect *outCoordinates,
PRBool *outIsCollapsed,
nsIView **outView) = 0;
/** Erase Caret
* this will erase the caret if its drawn and reset drawn status
*/
NS_IMETHOD EraseCaret() = 0;
NS_IMETHOD SetVisibilityDuringSelection(PRBool aVisibilityDuringSelection) = 0;
/** DrawAtPosition
*
* Draw the caret explicitly, at the specified node and offset.
* To avoid drawing glitches, you should call EraseCaret()
* after each call to DrawAtPosition().
*
**/
NS_IMETHOD DrawAtPosition(nsIDOMNode* aNode, PRInt32 aOffset) = 0;
/** GetCaretFrameForNodeOffset
* Get the frame and content offset at which the caret is drawn,
* invoking the bidi caret positioning algorithm if necessary
**/
NS_IMETHOD GetCaretFrameForNodeOffset(nsIContent* aContentNode,
PRInt32 aOffset,
nsFrameSelection::HINT aFrameHint,
PRUint8 aBidiLevel,
nsIFrame** aReturnFrame,
PRInt32* aReturnOffset) = 0;
/** GetCaretFrame
* Get the current frame that the caret should be drawn in. If the caret is
* not currently visible (i.e., it is between blinks), then this will
* return null.
*/
virtual nsIFrame *GetCaretFrame() = 0;
/** GetCaretRect
* Get the current caret rect. Only call this when GetCaretFrame returns
* non-null.
*/
virtual nsRect GetCaretRect() = 0;
/** GetCaretContent
* Get the content that the caret was last drawn in.
*/
virtual nsIContent* GetCaretContent() = 0;
/** InvalidateOutsideCaret
* Invalidate the area that the caret currently occupies if the caret is
* outside of its frame's overflow area. This is used when the content that
* the caret is currently drawn is is being deleted or reflowed.
*/
virtual void InvalidateOutsideCaret() = 0;
/** UpdateCaretPosition
* Update the caret's current frame and rect, but don't draw yet. This is
* useful for flickerless moving of the caret (e.g., when the frame the
* caret is in reflows and is moved).
*/
virtual void UpdateCaretPosition() = 0;
/** PaintCaret
* Actually paint the caret onto the given rendering context.
*/
virtual void PaintCaret(nsDisplayListBuilder *aBuilder,
nsIRenderingContext *aCtx,
const nsPoint &aOffset,
nscolor aColor) = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsICaret, NS_ICARET_IID)
nsresult
NS_NewCaret(nsICaret** aInstancePtrResult);
// handy stack-based class for temporarily disabling the caret
class StCaretHider
{
public:
StCaretHider(nsICaret* aSelCon)
: mWasVisible(PR_FALSE), mCaret(aSelCon)
{
if (mCaret)
{
mCaret->GetCaretVisible(&mWasVisible);
if (mWasVisible)
mCaret->SetCaretVisible(PR_FALSE);
}
}
~StCaretHider()
{
if (mCaret && mWasVisible)
mCaret->SetCaretVisible(PR_TRUE);
// nsCOMPtr releases mPresShell
}
protected:
PRBool mWasVisible;
nsCOMPtr<nsICaret> mCaret;
};
#endif // nsICaret_h__