/* -*- 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): * Pierre Phaneuf * Mats Palmgren * * 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 */ #include "nsCOMPtr.h" #include "nsITimer.h" #include "nsIComponentManager.h" #include "nsIServiceManager.h" #include "nsFrameSelection.h" #include "nsIFrame.h" #include "nsIScrollableFrame.h" #include "nsIDOMNode.h" #include "nsIDOMRange.h" #include "nsIFontMetrics.h" #include "nsISelection.h" #include "nsISelectionPrivate.h" #include "nsIDOMCharacterData.h" #include "nsIContent.h" #include "nsIPresShell.h" #include "nsIRenderingContext.h" #include "nsIDeviceContext.h" #include "nsIView.h" #include "nsIViewManager.h" #include "nsPresContext.h" #include "nsILookAndFeel.h" #include "nsBlockFrame.h" #include "nsISelectionController.h" #include "nsDisplayList.h" #include "nsCaret.h" #include "nsTextFrame.h" #include "nsXULPopupManager.h" #include "nsMenuPopupFrame.h" #include "nsTextFragment.h" #include "nsThemeConstants.h" // The bidi indicator hangs off the caret to one side, to show which // direction the typing is in. It needs to be at least 2x2 to avoid looking like // an insignificant dot static const PRInt32 kMinBidiIndicatorPixels = 2; #ifdef IBMBIDI #include "nsIBidiKeyboard.h" #include "nsContentUtils.h" #endif //IBMBIDI //----------------------------------------------------------------------------- nsCaret::nsCaret() : mPresShell(nsnull) , mBlinkRate(500) , mVisible(PR_FALSE) , mDrawn(PR_FALSE) , mPendingDraw(PR_FALSE) , mReadOnly(PR_FALSE) , mShowDuringSelection(PR_FALSE) , mIgnoreUserModify(PR_TRUE) #ifdef IBMBIDI , mKeyboardRTL(PR_FALSE) , mLastBidiLevel(0) #endif , mLastContentOffset(0) , mLastHint(nsFrameSelection::HINTLEFT) { } //----------------------------------------------------------------------------- nsCaret::~nsCaret() { KillTimer(); } //----------------------------------------------------------------------------- nsresult nsCaret::Init(nsIPresShell *inPresShell) { NS_ENSURE_ARG(inPresShell); mPresShell = do_GetWeakReference(inPresShell); // the presshell owns us, so no addref NS_ASSERTION(mPresShell, "Hey, pres shell should support weak refs"); // get nsILookAndFeel from the pres context, which has one cached. nsILookAndFeel *lookAndFeel = nsnull; nsPresContext *presContext = inPresShell->GetPresContext(); // XXX we should just do this nsILookAndFeel consultation every time // we need these values. mCaretWidthCSSPx = 1; mCaretAspectRatio = 0; if (presContext && (lookAndFeel = presContext->LookAndFeel())) { PRInt32 tempInt; float tempFloat; if (NS_SUCCEEDED(lookAndFeel->GetMetric(nsILookAndFeel::eMetric_CaretWidth, tempInt))) mCaretWidthCSSPx = (nscoord)tempInt; if (NS_SUCCEEDED(lookAndFeel->GetMetric(nsILookAndFeel::eMetricFloat_CaretAspectRatio, tempFloat))) mCaretAspectRatio = tempFloat; if (NS_SUCCEEDED(lookAndFeel->GetMetric(nsILookAndFeel::eMetric_CaretBlinkTime, tempInt))) mBlinkRate = (PRUint32)tempInt; if (NS_SUCCEEDED(lookAndFeel->GetMetric(nsILookAndFeel::eMetric_ShowCaretDuringSelection, tempInt))) mShowDuringSelection = tempInt ? PR_TRUE : PR_FALSE; } // get the selection from the pres shell, and set ourselves up as a selection // listener nsCOMPtr selCon = do_QueryReferent(mPresShell); if (!selCon) return NS_ERROR_FAILURE; nsCOMPtr domSelection; nsresult rv = selCon->GetSelection(nsISelectionController::SELECTION_NORMAL, getter_AddRefs(domSelection)); if (NS_FAILED(rv)) return rv; if (!domSelection) return NS_ERROR_FAILURE; nsCOMPtr privateSelection = do_QueryInterface(domSelection); if (privateSelection) privateSelection->AddSelectionListener(this); mDomSelectionWeak = do_GetWeakReference(domSelection); // set up the blink timer if (mVisible) { StartBlinking(); } #ifdef IBMBIDI mBidiUI = nsContentUtils::GetBoolPref("bidi.browser.ui"); #endif return NS_OK; } static PRBool DrawCJKCaret(nsIFrame* aFrame, PRInt32 aOffset) { nsIContent* content = aFrame->GetContent(); const nsTextFragment* frag = content->GetText(); if (!frag) return PR_FALSE; if (aOffset < 0 || PRUint32(aOffset) >= frag->GetLength()) return PR_FALSE; PRUnichar ch = frag->CharAt(aOffset); return 0x2e80 <= ch && ch <= 0xd7ff; } nsCaret::Metrics nsCaret::ComputeMetrics(nsIFrame* aFrame, PRInt32 aOffset, nscoord aCaretHeight) { // Compute nominal sizes in appunits nscoord caretWidth = (aCaretHeight * mCaretAspectRatio) + nsPresContext::CSSPixelsToAppUnits(mCaretWidthCSSPx); if (DrawCJKCaret(aFrame, aOffset)) { caretWidth += nsPresContext::CSSPixelsToAppUnits(1); } nscoord bidiIndicatorSize = nsPresContext::CSSPixelsToAppUnits(kMinBidiIndicatorPixels); bidiIndicatorSize = NS_MAX(caretWidth, bidiIndicatorSize); // Round them to device pixels. Always round down, except that anything // between 0 and 1 goes up to 1 so we don't let the caret disappear. PRUint32 tpp = aFrame->PresContext()->AppUnitsPerDevPixel(); Metrics result; result.mCaretWidth = NS_ROUND_BORDER_TO_PIXELS(caretWidth, tpp); result.mBidiIndicatorSize = NS_ROUND_BORDER_TO_PIXELS(bidiIndicatorSize, tpp); return result; } //----------------------------------------------------------------------------- void nsCaret::Terminate() { // this doesn't erase the caret if it's drawn. Should it? We might not have // a good drawing environment during teardown. KillTimer(); mBlinkTimer = nsnull; // unregiser ourselves as a selection listener nsCOMPtr domSelection = do_QueryReferent(mDomSelectionWeak); nsCOMPtr privateSelection(do_QueryInterface(domSelection)); if (privateSelection) privateSelection->RemoveSelectionListener(this); mDomSelectionWeak = nsnull; mPresShell = nsnull; mLastContent = nsnull; } //----------------------------------------------------------------------------- NS_IMPL_ISUPPORTS1(nsCaret, nsISelectionListener) //----------------------------------------------------------------------------- nsISelection* nsCaret::GetCaretDOMSelection() { nsCOMPtr sel(do_QueryReferent(mDomSelectionWeak)); return sel; } //----------------------------------------------------------------------------- nsresult nsCaret::SetCaretDOMSelection(nsISelection *aDOMSel) { NS_ENSURE_ARG_POINTER(aDOMSel); mDomSelectionWeak = do_GetWeakReference(aDOMSel); // weak reference to pres shell if (mVisible) { // Stop the caret from blinking in its previous location. StopBlinking(); // Start the caret blinking in the new location. StartBlinking(); } return NS_OK; } //----------------------------------------------------------------------------- void nsCaret::SetCaretVisible(PRBool inMakeVisible) { mVisible = inMakeVisible; if (mVisible) { StartBlinking(); SetIgnoreUserModify(PR_TRUE); } else { StopBlinking(); SetIgnoreUserModify(PR_FALSE); } } //----------------------------------------------------------------------------- nsresult nsCaret::GetCaretVisible(PRBool *outMakeVisible) { NS_ENSURE_ARG_POINTER(outMakeVisible); *outMakeVisible = (mVisible && MustDrawCaret(PR_TRUE)); return NS_OK; } //----------------------------------------------------------------------------- void nsCaret::SetCaretReadOnly(PRBool inMakeReadonly) { mReadOnly = inMakeReadonly; } //----------------------------------------------------------------------------- nsresult nsCaret::GetCaretCoordinates(EViewCoordinates aRelativeToType, nsISelection *aDOMSel, nsRect *outCoordinates, PRBool *outIsCollapsed, nsIView **outView) { if (!mPresShell) return NS_ERROR_NOT_INITIALIZED; if (!outCoordinates || !outIsCollapsed) return NS_ERROR_NULL_POINTER; nsCOMPtr domSelection = aDOMSel; if (outView) *outView = nsnull; // fill in defaults for failure outCoordinates->x = -1; outCoordinates->y = -1; outCoordinates->width = -1; outCoordinates->height = -1; *outIsCollapsed = PR_FALSE; nsresult err = domSelection->GetIsCollapsed(outIsCollapsed); if (NS_FAILED(err)) return err; nsCOMPtr focusNode; err = domSelection->GetFocusNode(getter_AddRefs(focusNode)); if (NS_FAILED(err)) return err; if (!focusNode) return NS_ERROR_FAILURE; PRInt32 focusOffset; err = domSelection->GetFocusOffset(&focusOffset); if (NS_FAILED(err)) return err; nsCOMPtr contentNode = do_QueryInterface(focusNode); if (!contentNode) return NS_ERROR_FAILURE; // find the frame that contains the content node that has focus nsIFrame* theFrame = nsnull; PRInt32 theFrameOffset = 0; nsCOMPtr frameSelection = GetFrameSelection(); if (!frameSelection) return NS_ERROR_FAILURE; PRUint8 bidiLevel = frameSelection->GetCaretBidiLevel(); err = GetCaretFrameForNodeOffset(contentNode, focusOffset, frameSelection->GetHint(), bidiLevel, &theFrame, &theFrameOffset); if (NS_FAILED(err) || !theFrame) return err; nsPoint viewOffset(0, 0); nsIView *drawingView; // views are not refcounted GetViewForRendering(theFrame, aRelativeToType, viewOffset, &drawingView, outView); if (!drawingView) return NS_ERROR_UNEXPECTED; nsPoint framePos(0, 0); err = theFrame->GetPointFromOffset(theFrameOffset, &framePos); if (NS_FAILED(err)) return err; // we don't need drawingView anymore so reuse that; reset viewOffset values for our purposes if (aRelativeToType == eClosestViewCoordinates) { theFrame->GetOffsetFromView(viewOffset, &drawingView); if (outView) *outView = drawingView; } // now add the frame offset to the view offset, and we're done viewOffset += framePos; outCoordinates->x = viewOffset.x; outCoordinates->y = viewOffset.y; outCoordinates->height = theFrame->GetSize().height; outCoordinates->width = ComputeMetrics(theFrame, theFrameOffset, outCoordinates->height).mCaretWidth; return NS_OK; } nsIFrame* nsCaret::GetGeometry(nsISelection* aSelection, nsRect* aRect) { nsCOMPtr focusNode; nsresult rv = aSelection->GetFocusNode(getter_AddRefs(focusNode)); if (NS_FAILED(rv) || !focusNode) return nsnull; PRInt32 focusOffset; rv = aSelection->GetFocusOffset(&focusOffset); if (NS_FAILED(rv)) return nsnull; nsCOMPtr contentNode = do_QueryInterface(focusNode); if (!contentNode) return nsnull; // find the frame that contains the content node that has focus nsIFrame* theFrame = nsnull; PRInt32 theFrameOffset = 0; nsCOMPtr frameSelection = GetFrameSelection(); if (!frameSelection) return nsnull; PRUint8 bidiLevel = frameSelection->GetCaretBidiLevel(); rv = GetCaretFrameForNodeOffset(contentNode, focusOffset, frameSelection->GetHint(), bidiLevel, &theFrame, &theFrameOffset); if (NS_FAILED(rv) || !theFrame) return nsnull; nsPoint framePos(0, 0); rv = theFrame->GetPointFromOffset(theFrameOffset, &framePos); if (NS_FAILED(rv)) return nsnull; // now add the frame offset to the view offset, and we're done nscoord height = theFrame->GetSize().height; nscoord width = ComputeMetrics(theFrame, theFrameOffset, height).mCaretWidth; *aRect = nsRect(framePos.x, 0, width, height); return theFrame; } void nsCaret::DrawCaretAfterBriefDelay() { // Make sure readonly caret gets drawn again if it needs to be if (!mBlinkTimer) { nsresult err; mBlinkTimer = do_CreateInstance("@mozilla.org/timer;1", &err); if (NS_FAILED(err)) return; } mBlinkTimer->InitWithFuncCallback(CaretBlinkCallback, this, 0, nsITimer::TYPE_ONE_SHOT); } void nsCaret::EraseCaret() { if (mDrawn) { DrawCaret(PR_TRUE); if (mReadOnly && mBlinkRate) { // If readonly we don't have a blink timer set, so caret won't // be redrawn automatically. We need to force the caret to get // redrawn right after the paint DrawCaretAfterBriefDelay(); } } } void nsCaret::SetVisibilityDuringSelection(PRBool aVisibility) { mShowDuringSelection = aVisibility; } nsresult nsCaret::DrawAtPosition(nsIDOMNode* aNode, PRInt32 aOffset) { NS_ENSURE_ARG(aNode); PRUint8 bidiLevel; nsCOMPtr frameSelection = GetFrameSelection(); if (!frameSelection) return NS_ERROR_FAILURE; bidiLevel = frameSelection->GetCaretBidiLevel(); // DrawAtPosition is used by consumers who want us to stay drawn where they // tell us. Setting mBlinkRate to 0 tells us to not set a timer to erase // ourselves, our consumer will take care of that. mBlinkRate = 0; // XXX we need to do more work here to get the correct hint. nsresult rv = DrawAtPositionWithHint(aNode, aOffset, nsFrameSelection::HINTLEFT, bidiLevel, PR_TRUE) ? NS_OK : NS_ERROR_FAILURE; ToggleDrawnStatus(); return rv; } nsIFrame * nsCaret::GetCaretFrame() { // Return null if we're not drawn to prevent anybody from trying to draw us. if (!mDrawn) return nsnull; // Recompute the frame that we're supposed to draw in to guarantee that // we're not going to try to draw into a stale (dead) frame. PRInt32 unused; nsIFrame *frame = nsnull; nsresult rv = GetCaretFrameForNodeOffset(mLastContent, mLastContentOffset, mLastHint, mLastBidiLevel, &frame, &unused); if (NS_FAILED(rv)) return nsnull; return frame; } void nsCaret::InvalidateOutsideCaret() { nsIFrame *frame = GetCaretFrame(); // Only invalidate if we are not fully contained by our frame's rect. if (frame && !frame->GetOverflowRect().Contains(GetCaretRect())) InvalidateRects(mCaretRect, GetHookRect(), frame); } void nsCaret::UpdateCaretPosition() { // We'll recalculate anyway if we're not drawn right now. if (!mDrawn) return; // A trick! Make the DrawCaret code recalculate the caret's current // position. mDrawn = PR_FALSE; DrawCaret(PR_FALSE); } void nsCaret::PaintCaret(nsDisplayListBuilder *aBuilder, nsIRenderingContext *aCtx, nsIFrame* aForFrame, const nsPoint &aOffset) { NS_ASSERTION(mDrawn, "The caret shouldn't be drawing"); const nsRect drawCaretRect = mCaretRect + aOffset; nscolor cssColor = aForFrame->GetStyleColor()->mColor; // Only draw the native caret if the foreground color matches that of // -moz-fieldtext (the color of the text in a textbox). If it doesn't match // we are likely in contenteditable or a custom widget and we risk being hard to see // against the background. In that case, fall back to the CSS color. nsPresContext* presContext = aForFrame->PresContext(); if (GetHookRect().IsEmpty() && presContext) { nsITheme *theme = presContext->GetTheme(); if (theme && theme->ThemeSupportsWidget(presContext, aForFrame, NS_THEME_TEXTFIELD_CARET)) { nsILookAndFeel* lookAndFeel = presContext->LookAndFeel(); nscolor fieldText; if (NS_SUCCEEDED(lookAndFeel->GetColor(nsILookAndFeel::eColor__moz_fieldtext, fieldText)) && fieldText == cssColor) { theme->DrawWidgetBackground(aCtx, aForFrame, NS_THEME_TEXTFIELD_CARET, drawCaretRect, drawCaretRect); return; } } } aCtx->SetColor(cssColor); aCtx->FillRect(drawCaretRect); if (!GetHookRect().IsEmpty()) aCtx->FillRect(GetHookRect() + aOffset); } //----------------------------------------------------------------------------- NS_IMETHODIMP nsCaret::NotifySelectionChanged(nsIDOMDocument *, nsISelection *aDomSel, PRInt16 aReason) { if (aReason & nsISelectionListener::MOUSEUP_REASON)//this wont do return NS_OK; nsCOMPtr domSel(do_QueryReferent(mDomSelectionWeak)); // The same caret is shared amongst the document and any text widgets it // may contain. This means that the caret could get notifications from // multiple selections. // // If this notification is for a selection that is not the one the // the caret is currently interested in (mDomSelectionWeak), then there // is nothing to do! if (domSel != aDomSel) return NS_OK; if (mVisible) { // Stop the caret from blinking in its previous location. StopBlinking(); // Start the caret blinking in the new location. StartBlinking(); } return NS_OK; } //----------------------------------------------------------------------------- void nsCaret::KillTimer() { if (mBlinkTimer) { mBlinkTimer->Cancel(); } } //----------------------------------------------------------------------------- nsresult nsCaret::PrimeTimer() { // set up the blink timer if (!mReadOnly && mBlinkRate > 0) { if (!mBlinkTimer) { nsresult err; mBlinkTimer = do_CreateInstance("@mozilla.org/timer;1", &err); if (NS_FAILED(err)) return err; } mBlinkTimer->InitWithFuncCallback(CaretBlinkCallback, this, mBlinkRate, nsITimer::TYPE_REPEATING_SLACK); } return NS_OK; } //----------------------------------------------------------------------------- void nsCaret::StartBlinking() { if (mReadOnly) { // Make sure the one draw command we use for a readonly caret isn't // done until the selection is set DrawCaretAfterBriefDelay(); return; } PrimeTimer(); // If we are currently drawn, then the second call to DrawCaret below will // actually erase the caret. That would cause the caret to spend an "off" // cycle before it appears, which is not really what we want. This first // call to DrawCaret makes sure that the first cycle after a call to // StartBlinking is an "on" cycle. if (mDrawn) DrawCaret(PR_TRUE); DrawCaret(PR_TRUE); // draw it right away } //----------------------------------------------------------------------------- void nsCaret::StopBlinking() { if (mDrawn) // erase the caret if necessary DrawCaret(PR_TRUE); NS_ASSERTION(!mDrawn, "Caret still drawn after StopBlinking()."); KillTimer(); } PRBool nsCaret::DrawAtPositionWithHint(nsIDOMNode* aNode, PRInt32 aOffset, nsFrameSelection::HINT aFrameHint, PRUint8 aBidiLevel, PRBool aInvalidate) { nsCOMPtr contentNode = do_QueryInterface(aNode); if (!contentNode) return PR_FALSE; nsIFrame* theFrame = nsnull; PRInt32 theFrameOffset = 0; nsresult rv = GetCaretFrameForNodeOffset(contentNode, aOffset, aFrameHint, aBidiLevel, &theFrame, &theFrameOffset); if (NS_FAILED(rv) || !theFrame) return PR_FALSE; // now we have a frame, check whether it's appropriate to show the caret here const nsStyleUserInterface* userinterface = theFrame->GetStyleUserInterface(); if ((!mIgnoreUserModify && userinterface->mUserModify == NS_STYLE_USER_MODIFY_READ_ONLY) || (userinterface->mUserInput == NS_STYLE_USER_INPUT_NONE) || (userinterface->mUserInput == NS_STYLE_USER_INPUT_DISABLED)) { return PR_FALSE; } if (!mDrawn) { // save stuff so we can figure out what frame we're in later. mLastContent = contentNode; mLastContentOffset = aOffset; mLastHint = aFrameHint; mLastBidiLevel = aBidiLevel; // If there has been a reflow, set the caret Bidi level to the level of the current frame if (aBidiLevel & BIDI_LEVEL_UNDEFINED) { nsCOMPtr frameSelection = GetFrameSelection(); if (!frameSelection) return PR_FALSE; frameSelection->SetCaretBidiLevel(NS_GET_EMBEDDING_LEVEL(theFrame)); } // Only update the caret's rect when we're not currently drawn. rv = UpdateCaretRects(theFrame, theFrameOffset); if (NS_FAILED(rv)) return PR_FALSE; } if (aInvalidate) InvalidateRects(mCaretRect, mHookRect, theFrame); return PR_TRUE; } /** * Find the first frame in an in-order traversal of the frame subtree rooted * at aFrame which is either a text frame logically at the end of a line, * or which is aStopAtFrame. Return null if no such frame is found. We don't * descend into the children of non-eLineParticipant frames. */ static nsIFrame* CheckForTrailingTextFrameRecursive(nsIFrame* aFrame, nsIFrame* aStopAtFrame) { if (aFrame == aStopAtFrame || ((aFrame->GetType() == nsGkAtoms::textFrame && (static_cast(aFrame))->IsAtEndOfLine()))) return aFrame; if (!aFrame->IsFrameOfType(nsIFrame::eLineParticipant)) return nsnull; for (nsIFrame* f = aFrame->GetFirstChild(nsnull); f; f = f->GetNextSibling()) { nsIFrame* r = CheckForTrailingTextFrameRecursive(f, aStopAtFrame); if (r) return r; } return nsnull; } static nsLineBox* FindContainingLine(nsIFrame* aFrame) { while (aFrame && aFrame->IsFrameOfType(nsIFrame::eLineParticipant)) { nsIFrame* parent = aFrame->GetParent(); nsBlockFrame* blockParent = nsLayoutUtils::GetAsBlock(parent); if (blockParent) { PRBool isValid; nsBlockInFlowLineIterator iter(blockParent, aFrame, &isValid); return isValid ? iter.GetLine().get() : nsnull; } aFrame = parent; } return nsnull; } static void AdjustCaretFrameForLineEnd(nsIFrame** aFrame, PRInt32* aOffset) { nsLineBox* line = FindContainingLine(*aFrame); if (!line) return; PRInt32 count = line->GetChildCount(); for (nsIFrame* f = line->mFirstChild; count > 0; --count, f = f->GetNextSibling()) { nsIFrame* r = CheckForTrailingTextFrameRecursive(f, *aFrame); if (r == *aFrame) return; if (r) { *aFrame = r; NS_ASSERTION(r->GetType() == nsGkAtoms::textFrame, "Expected text frame"); *aOffset = (static_cast(r))->GetContentEnd(); return; } } } nsresult nsCaret::GetCaretFrameForNodeOffset(nsIContent* aContentNode, PRInt32 aOffset, nsFrameSelection::HINT aFrameHint, PRUint8 aBidiLevel, nsIFrame** aReturnFrame, PRInt32* aReturnOffset) { //get frame selection and find out what frame to use... nsCOMPtr presShell = do_QueryReferent(mPresShell); if (!presShell) return NS_ERROR_FAILURE; nsCOMPtr frameSelection = GetFrameSelection(); if (!frameSelection) return NS_ERROR_FAILURE; nsIFrame* theFrame = nsnull; PRInt32 theFrameOffset = 0; theFrame = frameSelection->GetFrameForNodeOffset(aContentNode, aOffset, aFrameHint, &theFrameOffset); if (!theFrame) return NS_ERROR_FAILURE; // if theFrame is after a text frame that's logically at the end of the line // (e.g. if theFrame is a
frame), then put the caret at the end of // that text frame instead. This way, the caret will be positioned as if // trailing whitespace was not trimmed. AdjustCaretFrameForLineEnd(&theFrame, &theFrameOffset); // Mamdouh : modification of the caret to work at rtl and ltr with Bidi // // Direction Style from this->GetStyleData() // now in (visibility->mDirection) // ------------------ // NS_STYLE_DIRECTION_LTR : LTR or Default // NS_STYLE_DIRECTION_RTL // NS_STYLE_DIRECTION_INHERIT if (mBidiUI) { // If there has been a reflow, take the caret Bidi level to be the level of the current frame if (aBidiLevel & BIDI_LEVEL_UNDEFINED) aBidiLevel = NS_GET_EMBEDDING_LEVEL(theFrame); PRInt32 start; PRInt32 end; nsIFrame* frameBefore; nsIFrame* frameAfter; PRUint8 levelBefore; // Bidi level of the character before the caret PRUint8 levelAfter; // Bidi level of the character after the caret theFrame->GetOffsets(start, end); if (start == 0 || end == 0 || start == theFrameOffset || end == theFrameOffset) { nsPrevNextBidiLevels levels = frameSelection-> GetPrevNextBidiLevels(aContentNode, aOffset, PR_FALSE); /* Boundary condition, we need to know the Bidi levels of the characters before and after the caret */ if (levels.mFrameBefore || levels.mFrameAfter) { frameBefore = levels.mFrameBefore; frameAfter = levels.mFrameAfter; levelBefore = levels.mLevelBefore; levelAfter = levels.mLevelAfter; if ((levelBefore != levelAfter) || (aBidiLevel != levelBefore)) { aBidiLevel = NS_MAX(aBidiLevel, NS_MIN(levelBefore, levelAfter)); // rule c3 aBidiLevel = NS_MIN(aBidiLevel, NS_MAX(levelBefore, levelAfter)); // rule c4 if (aBidiLevel == levelBefore // rule c1 || (aBidiLevel > levelBefore && aBidiLevel < levelAfter && !((aBidiLevel ^ levelBefore) & 1)) // rule c5 || (aBidiLevel < levelBefore && aBidiLevel > levelAfter && !((aBidiLevel ^ levelBefore) & 1))) // rule c9 { if (theFrame != frameBefore) { if (frameBefore) // if there is a frameBefore, move into it { theFrame = frameBefore; theFrame->GetOffsets(start, end); theFrameOffset = end; } else { // if there is no frameBefore, we must be at the beginning of the line // so we stay with the current frame. // Exception: when the first frame on the line has a different Bidi level from the paragraph level, there is no // real frame for the caret to be in. We have to find the visually first frame on the line. PRUint8 baseLevel = NS_GET_BASE_LEVEL(frameAfter); if (baseLevel != levelAfter) { nsPeekOffsetStruct pos; pos.SetData(eSelectBeginLine, eDirPrevious, 0, 0, PR_FALSE, PR_TRUE, PR_FALSE, PR_TRUE); if (NS_SUCCEEDED(frameAfter->PeekOffset(&pos))) { theFrame = pos.mResultFrame; theFrameOffset = pos.mContentOffset; } } } } } else if (aBidiLevel == levelAfter // rule c2 || (aBidiLevel > levelBefore && aBidiLevel < levelAfter && !((aBidiLevel ^ levelAfter) & 1)) // rule c6 || (aBidiLevel < levelBefore && aBidiLevel > levelAfter && !((aBidiLevel ^ levelAfter) & 1))) // rule c10 { if (theFrame != frameAfter) { if (frameAfter) { // if there is a frameAfter, move into it theFrame = frameAfter; theFrame->GetOffsets(start, end); theFrameOffset = start; } else { // if there is no frameAfter, we must be at the end of the line // so we stay with the current frame. // Exception: when the last frame on the line has a different Bidi level from the paragraph level, there is no // real frame for the caret to be in. We have to find the visually last frame on the line. PRUint8 baseLevel = NS_GET_BASE_LEVEL(frameBefore); if (baseLevel != levelBefore) { nsPeekOffsetStruct pos; pos.SetData(eSelectEndLine, eDirNext, 0, 0, PR_FALSE, PR_TRUE, PR_FALSE, PR_TRUE); if (NS_SUCCEEDED(frameBefore->PeekOffset(&pos))) { theFrame = pos.mResultFrame; theFrameOffset = pos.mContentOffset; } } } } } else if (aBidiLevel > levelBefore && aBidiLevel < levelAfter // rule c7/8 && !((levelBefore ^ levelAfter) & 1) // before and after have the same parity && ((aBidiLevel ^ levelAfter) & 1)) // caret has different parity { if (NS_SUCCEEDED(frameSelection->GetFrameFromLevel(frameAfter, eDirNext, aBidiLevel, &theFrame))) { theFrame->GetOffsets(start, end); levelAfter = NS_GET_EMBEDDING_LEVEL(theFrame); if (aBidiLevel & 1) // c8: caret to the right of the rightmost character theFrameOffset = (levelAfter & 1) ? start : end; else // c7: caret to the left of the leftmost character theFrameOffset = (levelAfter & 1) ? end : start; } } else if (aBidiLevel < levelBefore && aBidiLevel > levelAfter // rule c11/12 && !((levelBefore ^ levelAfter) & 1) // before and after have the same parity && ((aBidiLevel ^ levelAfter) & 1)) // caret has different parity { if (NS_SUCCEEDED(frameSelection->GetFrameFromLevel(frameBefore, eDirPrevious, aBidiLevel, &theFrame))) { theFrame->GetOffsets(start, end); levelBefore = NS_GET_EMBEDDING_LEVEL(theFrame); if (aBidiLevel & 1) // c12: caret to the left of the leftmost character theFrameOffset = (levelBefore & 1) ? end : start; else // c11: caret to the right of the rightmost character theFrameOffset = (levelBefore & 1) ? start : end; } } } } } } *aReturnFrame = theFrame; *aReturnOffset = theFrameOffset; return NS_OK; } //----------------------------------------------------------------------------- void nsCaret::GetViewForRendering(nsIFrame *caretFrame, EViewCoordinates coordType, nsPoint &viewOffset, nsIView **outRenderingView, nsIView **outRelativeView) { if (!caretFrame || !outRenderingView) return; *outRenderingView = nsnull; if (outRelativeView) *outRelativeView = nsnull; NS_ASSERTION(caretFrame, "Should have a frame here"); viewOffset.x = 0; viewOffset.y = 0; nsPoint withinViewOffset(0, 0); // get the offset of this frame from its parent view (walks up frame hierarchy) nsIView* theView = nsnull; caretFrame->GetOffsetFromView(withinViewOffset, &theView); if (!theView) return; if (outRelativeView && coordType == eClosestViewCoordinates) *outRelativeView = theView; // Note: views are not refcounted. nsIView* returnView = nsIView::GetViewFor(theView->GetNearestWidget(nsnull)); // This gets uses the first view with a widget if (coordType == eRenderingViewCoordinates) { if (returnView) { // Now adjust the view offset for this view. withinViewOffset += theView->GetOffsetTo(returnView); // Account for the view's origin not lining up with the widget's // (bug 190290) withinViewOffset += returnView->GetPosition() - returnView->GetBounds().TopLeft(); viewOffset = withinViewOffset; if (outRelativeView) *outRelativeView = returnView; } } else { // window-relative coordinates. Done for us by the view. withinViewOffset += theView->GetOffsetTo(nsnull); viewOffset = withinViewOffset; // Get the relative view for top level window coordinates if (outRelativeView && coordType == eTopLevelWindowCoordinates) { nsCOMPtr presShell = do_QueryReferent(mPresShell); if (presShell) { nsIViewManager* vm = presShell->GetPresContext()->RootPresContext()->PresShell()->GetViewManager(); if (vm) { vm->GetRootView(*outRelativeView); } } } } *outRenderingView = returnView; } nsresult nsCaret::CheckCaretDrawingState() { if (mDrawn) { // The caret is drawn; if it shouldn't be, erase it. if (!mVisible || !MustDrawCaret(PR_TRUE)) EraseCaret(); } else { // The caret is not drawn; if it should be, draw it. if (mPendingDraw && (mVisible && MustDrawCaret(PR_TRUE))) DrawCaret(PR_TRUE); } return NS_OK; } /*----------------------------------------------------------------------------- MustDrawCaret Find out if we need to do any caret drawing. This returns true if either: a) The caret has been drawn, and we need to erase it. b) The caret is not drawn, and the selection is collapsed. c) The caret is not hidden due to open XUL popups (see IsMenuPopupHidingCaret()). ----------------------------------------------------------------------------- */ PRBool nsCaret::MustDrawCaret(PRBool aIgnoreDrawnState) { if (!aIgnoreDrawnState && mDrawn) return PR_TRUE; nsCOMPtr domSelection = do_QueryReferent(mDomSelectionWeak); if (!domSelection) return PR_FALSE; PRBool isCollapsed; if (NS_FAILED(domSelection->GetIsCollapsed(&isCollapsed))) return PR_FALSE; if (mShowDuringSelection) return PR_TRUE; // show the caret even in selections if (IsMenuPopupHidingCaret()) return PR_FALSE; return isCollapsed; } PRBool nsCaret::IsMenuPopupHidingCaret() { #ifdef MOZ_XUL // Check if there are open popups. nsXULPopupManager *popMgr = nsXULPopupManager::GetInstance(); nsTArray popups = popMgr->GetVisiblePopups(); if (popups.Length() == 0) return PR_FALSE; // No popups, so caret can't be hidden by them. // Get the selection focus content, that's where the caret would // go if it was drawn. nsCOMPtr node; nsCOMPtr domSelection = do_QueryReferent(mDomSelectionWeak); if (!domSelection) return PR_TRUE; // No selection/caret to draw. domSelection->GetFocusNode(getter_AddRefs(node)); if (!node) return PR_TRUE; // No selection/caret to draw. nsCOMPtr caretContent = do_QueryInterface(node); if (!caretContent) return PR_TRUE; // No selection/caret to draw. // If there's a menu popup open before the popup with // the caret, don't show the caret. for (PRUint32 i=0; i(popups[i]); nsIContent* popupContent = popupFrame->GetContent(); if (nsContentUtils::ContentIsDescendantOf(caretContent, popupContent)) { // The caret is in this popup. There were no menu popups before this // popup, so don't hide the caret. return PR_FALSE; } if (popupFrame->PopupType() == ePopupTypeMenu && !popupFrame->IsContextMenu()) { // This is an open menu popup. It does not contain the caret (else we'd // have returned above). Even if the caret is in a subsequent popup, // or another document/frame, it should be hidden. return PR_TRUE; } } #endif // There are no open menu popups, no need to hide the caret. return PR_FALSE; } void nsCaret::DrawCaret(PRBool aInvalidate) { // Do we need to draw the caret at all? if (!MustDrawCaret(PR_FALSE)) return; // Can we draw the caret now? nsCOMPtr presShell = do_QueryReferent(mPresShell); NS_ENSURE_TRUE(presShell, /**/); { PRBool isPaintingSuppressed; presShell->IsPaintingSuppressed(&isPaintingSuppressed); if (isPaintingSuppressed) { if (!mDrawn) mPendingDraw = PR_TRUE; // PresShell::UnsuppressAndInvalidate() will call CheckCaretDrawingState() // to get us drawn. return; } } nsCOMPtr node; PRInt32 offset; nsFrameSelection::HINT hint; PRUint8 bidiLevel; if (!mDrawn) { nsCOMPtr domSelection = do_QueryReferent(mDomSelectionWeak); nsCOMPtr privateSelection(do_QueryInterface(domSelection)); if (!privateSelection) return; PRBool isCollapsed = PR_FALSE; domSelection->GetIsCollapsed(&isCollapsed); if (!mShowDuringSelection && !isCollapsed) return; PRBool hintRight; privateSelection->GetInterlinePosition(&hintRight);//translate hint. hint = hintRight ? nsFrameSelection::HINTRIGHT : nsFrameSelection::HINTLEFT; // get the node and offset, which is where we want the caret to draw domSelection->GetFocusNode(getter_AddRefs(node)); if (!node) return; if (NS_FAILED(domSelection->GetFocusOffset(&offset))) return; nsCOMPtr frameSelection = GetFrameSelection(); if (!frameSelection) return; bidiLevel = frameSelection->GetCaretBidiLevel(); mPendingDraw = PR_FALSE; } else { if (!mLastContent) { mDrawn = PR_FALSE; return; } if (!mLastContent->IsInDoc()) { mLastContent = nsnull; mDrawn = PR_FALSE; return; } node = do_QueryInterface(mLastContent); offset = mLastContentOffset; hint = mLastHint; bidiLevel = mLastBidiLevel; } DrawAtPositionWithHint(node, offset, hint, bidiLevel, aInvalidate); ToggleDrawnStatus(); } static PRBool FramesOnSameLineHaveZeroHeight(nsIFrame* aFrame) { nsLineBox* line = FindContainingLine(aFrame); if (!line) return aFrame->GetRect().height == 0; PRInt32 count = line->GetChildCount(); for (nsIFrame* f = line->mFirstChild; count > 0; --count, f = f->GetNextSibling()) { if (f->GetRect().height != 0) return PR_FALSE; } return PR_TRUE; } nsresult nsCaret::UpdateCaretRects(nsIFrame* aFrame, PRInt32 aFrameOffset) { NS_ASSERTION(aFrame, "Should have a frame here"); nsRect frameRect = aFrame->GetRect(); frameRect.x = 0; frameRect.y = 0; nsCOMPtr presShell = do_QueryReferent(mPresShell); if (!presShell) return NS_ERROR_FAILURE; // If we got a zero-height frame we should figure out a height. We have to do // this after we've got an RC. if (frameRect.height == 0) { nsCOMPtr fm; nsLayoutUtils::GetFontMetricsForFrame(aFrame, getter_AddRefs(fm)); if (fm) { nscoord ascent, descent; fm->GetMaxAscent(ascent); fm->GetMaxDescent(descent); frameRect.height = ascent + descent; // Place the caret on the baseline for inline frames, except when there is // a frame on the line with non-zero height. XXXmats why the exception? -- // I don't know but it seems to be necessary, see bug 503531. if (aFrame->GetStyleDisplay()->IsInlineOutside() && !FramesOnSameLineHaveZeroHeight(aFrame)) frameRect.y -= ascent; } } mCaretRect = frameRect; nsCOMPtr domSelection = do_QueryReferent(mDomSelectionWeak); nsCOMPtr privateSelection = do_QueryInterface(domSelection); nsPoint framePos; // if cache in selection is available, apply it, else refresh it nsresult rv = privateSelection->GetCachedFrameOffset(aFrame, aFrameOffset, framePos); if (NS_FAILED(rv)) { mCaretRect.Empty(); return rv; } mCaretRect += framePos; Metrics metrics = ComputeMetrics(aFrame, aFrameOffset, mCaretRect.height); mCaretRect.width = metrics.mCaretWidth; // Clamp our position to be within our scroll frame. If we don't, then it // clips us, and we don't appear at all. See bug 335560. nsIFrame *scrollFrame = nsLayoutUtils::GetClosestFrameOfType(aFrame, nsGkAtoms::scrollFrame); if (scrollFrame) { // First, use the scrollFrame to get at the scrollable view that we're in. nsIScrollableFrame *sf = do_QueryFrame(scrollFrame); nsIFrame *scrolled = sf->GetScrolledFrame(); nsRect caretInScroll = mCaretRect + aFrame->GetOffsetTo(scrolled); // Now see if thet caret extends beyond the view's bounds. If it does, // then snap it back, put it as close to the edge as it can. nscoord overflow = caretInScroll.XMost() - scrolled->GetOverflowRectRelativeToSelf().width; if (overflow > 0) mCaretRect.x -= overflow; } // on RTL frames the right edge of mCaretRect must be equal to framePos const nsStyleVisibility* vis = aFrame->GetStyleVisibility(); if (NS_STYLE_DIRECTION_RTL == vis->mDirection) mCaretRect.x -= mCaretRect.width; return UpdateHookRect(presShell->GetPresContext(), metrics); } nsresult nsCaret::UpdateHookRect(nsPresContext* aPresContext, const Metrics& aMetrics) { mHookRect.Empty(); #ifdef IBMBIDI // Simon -- make a hook to draw to the left or right of the caret to show keyboard language direction PRBool isCaretRTL=PR_FALSE; nsIBidiKeyboard* bidiKeyboard = nsContentUtils::GetBidiKeyboard(); if (!bidiKeyboard || NS_FAILED(bidiKeyboard->IsLangRTL(&isCaretRTL))) // if bidiKeyboard->IsLangRTL() failed, there is no way to tell the // keyboard direction, or the user has no right-to-left keyboard // installed, so we never draw the hook. return NS_OK; if (mBidiUI) { if (isCaretRTL != mKeyboardRTL) { /* if the caret bidi level and the keyboard language direction are not in * synch, the keyboard language must have been changed by the * user, and if the caret is in a boundary condition (between left-to-right and * right-to-left characters) it may have to change position to * reflect the location in which the next character typed will * appear. We will call |SelectionLanguageChange| and exit * without drawing the caret in the old position. */ mKeyboardRTL = isCaretRTL; nsCOMPtr domSelection = do_QueryReferent(mDomSelectionWeak); if (domSelection) { if (NS_SUCCEEDED(domSelection->SelectionLanguageChange(mKeyboardRTL))) { return NS_ERROR_FAILURE; } } } // If keyboard language is RTL, draw the hook on the left; if LTR, to the right // The height of the hook rectangle is the same as the width of the caret // rectangle. nscoord bidiIndicatorSize = aMetrics.mBidiIndicatorSize; mHookRect.SetRect(mCaretRect.x + ((isCaretRTL) ? bidiIndicatorSize * -1 : mCaretRect.width), mCaretRect.y + bidiIndicatorSize, bidiIndicatorSize, mCaretRect.width); } #endif //IBMBIDI return NS_OK; } // static void nsCaret::InvalidateRects(const nsRect &aRect, const nsRect &aHook, nsIFrame *aFrame) { NS_ASSERTION(aFrame, "Must have a frame to invalidate"); nsRect rect; rect.UnionRect(aRect, aHook); aFrame->Invalidate(rect); } //----------------------------------------------------------------------------- /* static */ void nsCaret::CaretBlinkCallback(nsITimer *aTimer, void *aClosure) { nsCaret *theCaret = reinterpret_cast(aClosure); if (!theCaret) return; theCaret->DrawCaret(PR_TRUE); } //----------------------------------------------------------------------------- already_AddRefed nsCaret::GetFrameSelection() { nsCOMPtr privateSelection(do_QueryReferent(mDomSelectionWeak)); if (!privateSelection) return nsnull; nsFrameSelection* frameSelection = nsnull; privateSelection->GetFrameSelection(&frameSelection); return frameSelection; } void nsCaret::SetIgnoreUserModify(PRBool aIgnoreUserModify) { if (!aIgnoreUserModify && mIgnoreUserModify && mDrawn) { // We're turning off mIgnoreUserModify. If the caret's drawn // in a read-only node we must erase it, else the next call // to DrawCaret() won't erase the old caret, due to the new // mIgnoreUserModify value. nsIFrame *frame = GetCaretFrame(); if (frame) { const nsStyleUserInterface* userinterface = frame->GetStyleUserInterface(); if (userinterface->mUserModify == NS_STYLE_USER_MODIFY_READ_ONLY) { StopBlinking(); } } } mIgnoreUserModify = aIgnoreUserModify; } //----------------------------------------------------------------------------- nsresult NS_NewCaret(nsCaret** aInstancePtrResult) { NS_PRECONDITION(aInstancePtrResult, "null ptr"); nsCaret* caret = new nsCaret(); if (nsnull == caret) return NS_ERROR_OUT_OF_MEMORY; NS_ADDREF(caret); *aInstancePtrResult = caret; return NS_OK; }