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: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* 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 nsRenderingContext;
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 true it is shown, false it is hidden
* @return false if and only if inMakeVisible is null, otherwise true
*/
virtual nsresult GetCaretVisible(bool *outMakeVisible);
/** SetCaretVisible will set the visibility of the caret
* @param inMakeVisible true to show the caret, false to hide it
*/
void SetCaretVisible(bool intMakeVisible);
/** SetCaretReadOnly set the appearance of the caret
* @param inMakeReadonly true to show the caret in a 'read only' state,
* false to show the caret in normal, editing state
*/
void SetCaretReadOnly(bool inMakeReadonly);
/** GetCaretReadOnly get the appearance of the caret
* @return true if the caret is in 'read only' state, otherwise,
* returns false
*/
bool 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(bool 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,
nsRenderingContext *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 true to have the cursor visible in all nodes,
* false to have it visible in all nodes except
* those with user-modify: read-only
*/
void SetIgnoreUserModify(bool 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();
// If the nearest block has a potential 'text-overflow' marker then
// invalidate it.
void InvalidateTextOverflowBlock();
bool DrawAtPositionWithHint(nsIDOMNode* aNode,
PRInt32 aOffset,
nsFrameSelection::HINT aFrameHint,
PRUint8 aBidiLevel,
bool 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);
nsresult 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.
bool MustDrawCaret(bool aIgnoreDrawnState);
void DrawCaret(bool aInvalidate);
void DrawCaretAfterBriefDelay();
bool 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.
bool 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
bool mVisible; // is the caret blinking
bool mDrawn; // Denotes when the caret is physically drawn on the screen.
bool mPendingDraw; // True when the last on-state draw was suppressed.
bool mReadOnly; // it the caret in readonly state (draws differently)
bool mShowDuringSelection; // show when text is selected
bool mIgnoreUserModify;
#ifdef IBMBIDI
bool mKeyboardRTL; // is the keyboard language right-to-left
bool 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
};
// handy stack-based class for temporarily disabling the caret
class StCaretHider
{
public:
StCaretHider(nsCaret* aSelCon)
: mWasVisible(false), mCaret(aSelCon)
{
if (mCaret)
{
mCaret->GetCaretVisible(&mWasVisible);
if (mWasVisible)
mCaret->SetCaretVisible(false);
}
}
~StCaretHider()
{
if (mCaret && mWasVisible)
mCaret->SetCaretVisible(true);
// nsCOMPtr releases mPresShell
}
protected:
bool mWasVisible;
nsCOMPtr<nsCaret> mCaret;
};
#endif //nsCaret_h__