gecko-dev/layout/base/nsCaret.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* ***** 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.
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* 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
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#include "nsCoord.h"
#include "nsISelectionListener.h"
#include "nsIRenderingContext.h"
#include "nsITimer.h"
#include "nsICaret.h"
#include "nsWeakPtr.h"
#ifdef IBMBIDI
#include "nsIBidiKeyboard.h"
#endif
class nsIView;
//-----------------------------------------------------------------------------
class nsCaret : public nsICaret,
public nsISelectionListener
{
public:
nsCaret();
virtual ~nsCaret();
NS_DECL_ISUPPORTS
public:
// nsICaret interface
NS_IMETHOD Init(nsIPresShell *inPresShell);
NS_IMETHOD Terminate();
NS_IMETHOD GetCaretDOMSelection(nsISelection **outDOMSel);
NS_IMETHOD SetCaretDOMSelection(nsISelection *inDOMSel);
NS_IMETHOD GetCaretVisible(PRBool *outMakeVisible);
NS_IMETHOD SetCaretVisible(PRBool intMakeVisible);
NS_IMETHOD SetCaretReadOnly(PRBool inMakeReadonly);
NS_IMETHOD GetCaretCoordinates(EViewCoordinates aRelativeToType, nsISelection *inDOMSel, nsRect* outCoordinates, PRBool* outIsCollapsed, nsIView **outView);
NS_IMETHOD ClearFrameRefs(nsIFrame* aFrame);
NS_IMETHOD EraseCaret();
NS_IMETHOD SetVisibilityDuringSelection(PRBool aVisibility);
NS_IMETHOD DrawAtPosition(nsIDOMNode* aNode, PRInt32 aOffset);
//nsISelectionListener interface
NS_DECL_NSISELECTIONLISTENER
static void CaretBlinkCallback(nsITimer *aTimer, void *aClosure);
protected:
void KillTimer();
nsresult PrimeTimer();
nsresult StartBlinking();
nsresult StopBlinking();
void GetViewForRendering(nsIFrame *caretFrame, EViewCoordinates coordType, nsPoint &viewOffset, nsRect& outClipRect, nsIView **outRenderingView, nsIView **outRelativeView);
PRBool SetupDrawingFrameAndOffset(nsIDOMNode* aNode, PRInt32 aOffset, nsIFrameSelection::HINT aFrameHint);
PRBool MustDrawCaret();
void DrawCaret();
void GetCaretRectAndInvert();
void ToggleDrawnStatus() { mDrawn = !mDrawn; }
protected:
nsWeakPtr mPresShell;
nsWeakPtr mDomSelectionWeak;
nsCOMPtr<nsITimer> mBlinkTimer;
nsCOMPtr<nsIRenderingContext> mRendContext;
PRUint32 mBlinkRate; // time for one cyle (off then on), in milliseconds
nscoord mCaretTwipsWidth; // caret width in twips. this gets calculated laziiy
nscoord mBidiIndicatorTwipsSize; // width and height of bidi indicator
PRPackedBool mVisible; // is the caret blinking
PRPackedBool mDrawn; // this should be mutable
PRPackedBool mReadOnly; // it the caret in readonly state (draws differently)
PRPackedBool mShowDuringSelection; // show when text is selected
nsRect mCaretRect; // the last caret rect
nsIFrame* mLastCaretFrame; // store the frame the caret was last drawn in.
nsIView* mLastCaretView; // last view that we used for drawing. Cached so we can tell when we need to make a new RC
PRInt32 mLastContentOffset;
#ifdef IBMBIDI
nsRect mHookRect; // directional hook on the caret
nsCOMPtr<nsIBidiKeyboard> mBidiKeyboard; // Bidi keyboard object to set and query keyboard language
PRPackedBool mKeyboardRTL; // is the keyboard language right-to-left
#endif
};