/* -*- 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 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. */ nsIFrame* GetCaretFrame(); /** 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 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 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 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
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 mCaret; }; #endif //nsCaret_h__