gecko-dev/layout/base/nsCaret.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"),
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/* the caret is the text cursor used, e.g., when editing */
#ifndef nsCaret_h__
#define nsCaret_h__
#include "nsCoord.h"
#include "nsISelectionListener.h"
#include "nsITimer.h"
#include "nsWeakPtr.h"
#include "nsFrameSelection.h"
class nsIRenderingContext;
class nsDisplayListBuilder;
//-----------------------------------------------------------------------------
class nsCaret : public nsISelectionListener
{
public:
nsCaret();
virtual ~nsCaret();
enum EViewCoordinates {
eTopLevelWindowCoordinates,
eRenderingViewCoordinates,
eClosestViewCoordinates
};
public:
NS_DECL_ISUPPORTS
nsresult Init(nsIPresShell *inPresShell);
void Terminate();
nsISelection* GetCaretDOMSelection();
nsresult SetCaretDOMSelection(nsISelection *inDOMSel);
/** GetCaretVisible will get the visibility of the caret
* This function is virtual so that it can be used by nsCaretAccessible
* without linking
* @param inMakeVisible PR_TRUE it is shown, PR_FALSE it is hidden
* @return false if and only if inMakeVisible is null, otherwise true
*/
virtual nsresult GetCaretVisible(PRBool *outMakeVisible);
/** SetCaretVisible will set the visibility of the caret
* @param inMakeVisible PR_TRUE to show the caret, PR_FALSE to hide it
*/
void SetCaretVisible(PRBool intMakeVisible);
/** 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
*/
void SetCaretReadOnly(PRBool inMakeReadonly);
/** GetCaretReadOnly get the appearance of the caret
* @return PR_TRUE if the caret is in 'read only' state, otherwise,
* returns PR_FALSE
*/
PRBool GetCaretReadOnly()
{
return mReadOnly;
}
/**
* Gets the position and size of the caret that would be drawn for
* the focus node/offset of aSelection (assuming it would be drawn,
* i.e., disregarding blink status). The geometry is stored in aRect,
* and we return the frame aRect is relative to.
* @param aRect must be non-null
* @param aBidiIndicatorSize if non-null, set to the bidi indicator size.
*/
virtual nsIFrame* GetGeometry(nsISelection* aSelection,
nsRect* aRect,
nscoord* aBidiIndicatorSize = nsnull);
/** EraseCaret
* this will erase the caret if its drawn and reset drawn status
*/
void EraseCaret();
void SetVisibilityDuringSelection(PRBool aVisibility);
/** DrawAtPosition
*
* Draw the caret explicitly, at the specified node and offset.
* To avoid drawing glitches, you should call EraseCaret()
* after each call to DrawAtPosition().
*
* Note: This call breaks the caret's ability to blink at all.
**/
nsresult DrawAtPosition(nsIDOMNode* aNode, PRInt32 aOffset);
/** 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.
*
* @param aOffset is result of the caret offset in the content.
*/
nsIFrame* GetCaretFrame(PRInt32 *aOffset = nsnull);
/** GetCaretRect
* Get the current caret rect. Only call this when GetCaretFrame returns
* non-null.
*/
nsRect GetCaretRect()
{
nsRect r;
r.UnionRect(mCaretRect, GetHookRect());
return r;
}
/** 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.
*/
void InvalidateOutsideCaret();
/** 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).
*/
void UpdateCaretPosition();
/** PaintCaret
* Actually paint the caret onto the given rendering context.
*/
void PaintCaret(nsDisplayListBuilder *aBuilder,
nsIRenderingContext *aCtx,
nsIFrame *aForFrame,
const nsPoint &aOffset);
/**
* Sets whether the caret should only be visible in nodes that are not
* user-modify: read-only, or whether it should be visible in all nodes.
*
* @param aIgnoreUserModify PR_TRUE to have the cursor visible in all nodes,
* PR_FALSE to have it visible in all nodes except
* those with user-modify: read-only
*/
void SetIgnoreUserModify(PRBool aIgnoreUserModify);
//nsISelectionListener interface
NS_DECL_NSISELECTIONLISTENER
static void CaretBlinkCallback(nsITimer *aTimer, void *aClosure);
nsresult GetCaretFrameForNodeOffset(nsIContent* aContentNode,
PRInt32 aOffset,
nsFrameSelection::HINT aFrameHint,
PRUint8 aBidiLevel,
nsIFrame** aReturnFrame,
PRInt32* aReturnOffset);
NS_IMETHOD CheckCaretDrawingState();
protected:
void KillTimer();
nsresult PrimeTimer();
void StartBlinking();
void StopBlinking();
PRBool DrawAtPositionWithHint(nsIDOMNode* aNode,
PRInt32 aOffset,
nsFrameSelection::HINT aFrameHint,
PRUint8 aBidiLevel,
PRBool aInvalidate);
struct Metrics {
nscoord mBidiIndicatorSize; // width and height of bidi indicator
nscoord mCaretWidth; // full caret width including bidi indicator
};
Metrics ComputeMetrics(nsIFrame* aFrame, PRInt32 aOffset, nscoord aCaretHeight);
void GetGeometryForFrame(nsIFrame* aFrame,
PRInt32 aFrameOffset,
nsRect* aRect,
nscoord* aBidiIndicatorSize);
// Returns true if the caret should be drawn. When |mDrawn| is true,
// this returns true, so that we erase the drawn caret. If |aIgnoreDrawnState|
// is true, we don't take into account whether the caret is currently
// drawn or not. This can be used to determine if the caret is drawn when
// it shouldn't be.
PRBool MustDrawCaret(PRBool aIgnoreDrawnState);
void DrawCaret(PRBool aInvalidate);
void DrawCaretAfterBriefDelay();
PRBool UpdateCaretRects(nsIFrame* aFrame, PRInt32 aFrameOffset);
static void InvalidateRects(const nsRect &aRect, const nsRect &aHook,
nsIFrame *aFrame);
nsRect GetHookRect()
{
#ifdef IBMBIDI
return mHookRect;
#else
return nsRect();
#endif
}
void ToggleDrawnStatus() { mDrawn = !mDrawn; }
already_AddRefed<nsFrameSelection> GetFrameSelection();
// Returns true if we should not draw the caret because of XUL menu popups.
// The caret should be hidden if:
// 1. An open popup contains the caret, but a menu popup exists before the
// caret-owning popup in the popup list (i.e. a menu is in front of the
// popup with the caret). If the menu itself contains the caret we don't
// hide it.
// 2. A menu popup is open, but there is no caret present in any popup.
// 3. The caret selection is empty.
PRBool IsMenuPopupHidingCaret();
protected:
nsWeakPtr mPresShell;
nsWeakPtr mDomSelectionWeak;
nsCOMPtr<nsITimer> mBlinkTimer;
// XXX these fields should go away and the values be acquired as needed,
// probably by ComputeMetrics.
PRUint32 mBlinkRate; // time for one cyle (on then off), in milliseconds
nscoord mCaretWidthCSSPx; // caret width in CSS pixels
float mCaretAspectRatio; // caret width/height aspect ratio
PRPackedBool mVisible; // is the caret blinking
PRPackedBool mDrawn; // Denotes when the caret is physically drawn on the screen.
PRPackedBool mPendingDraw; // True when the last on-state draw was suppressed.
PRPackedBool mReadOnly; // it the caret in readonly state (draws differently)
PRPackedBool mShowDuringSelection; // show when text is selected
PRPackedBool mIgnoreUserModify;
#ifdef IBMBIDI
PRPackedBool mKeyboardRTL; // is the keyboard language right-to-left
PRPackedBool mBidiUI; // is bidi UI turned on
nsRect mHookRect; // directional hook on the caret
PRUint8 mLastBidiLevel; // saved bidi level of the last draw request, to use when we erase
#endif
nsRect mCaretRect; // the last caret rect, in the coodinates of the last frame.
nsCOMPtr<nsIContent> mLastContent; // store the content the caret was last requested to be drawn
// in (by DrawAtPosition()/DrawCaret()),
// note that this can be different than where it was
// actually drawn (anon <BR> in text control)
PRInt32 mLastContentOffset; // the offset for the last request
nsFrameSelection::HINT mLastHint; // the hint associated with the last request, see also
// mLastBidiLevel below
};
nsresult
NS_NewCaret(nsCaret** aInstancePtrResult);
// handy stack-based class for temporarily disabling the caret
class StCaretHider
{
public:
StCaretHider(nsCaret* 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<nsCaret> mCaret;
};
#endif //nsCaret_h__