/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- * * The contents of this file are subject to the Netscape 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/NPL/ * * 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 Netscape are * Copyright (C) 1998 Netscape Communications Corporation. All * Rights Reserved. * * Contributor(s): * Pierre Phaneuf */ #include "nsCOMPtr.h" #include "nsITimer.h" #include "nsITimerCallback.h" #include "nsIComponentManager.h" #include "nsIFrameSelection.h" #include "nsIFrame.h" #include "nsIDOMNode.h" #include "nsIDOMRange.h" #include "nsIDOMSelection.h" #include "nsIDOMCharacterData.h" #include "nsIContent.h" #include "nsIPresShell.h" #include "nsIRenderingContext.h" #include "nsIDeviceContext.h" #include "nsIView.h" #include "nsIViewManager.h" #include "nsIPresContext.h" #include "nsILookAndFeel.h" #include "nsWidgetsCID.h" // for NS_LOOKANDFEEL_CID #include "nsBlockFrame.h" #include "nsISelectionController.h" #include "nsCaret.h" static NS_DEFINE_IID(kLookAndFeelCID, NS_LOOKANDFEEL_CID); //----------------------------------------------------------------------------- nsCaret::nsCaret() : mPresShell(nsnull) , mBlinkTimer(nsnull) , mBlinkRate(500) , mCaretWidth(20) , mVisible(PR_FALSE) , mReadOnly(PR_TRUE) , mDrawn(PR_FALSE) , mLastCaretFrame(nsnull) , mLastContentOffset(0) { NS_INIT_REFCNT(); } //----------------------------------------------------------------------------- nsCaret::~nsCaret() { KillTimer(); } //----------------------------------------------------------------------------- NS_IMETHODIMP nsCaret::Init(nsIPresShell *inPresShell) { if (!inPresShell) return NS_ERROR_NULL_POINTER; mPresShell = getter_AddRefs(NS_GetWeakReference(inPresShell)); // the presshell owns us, so no addref nsILookAndFeel* touchyFeely; if (NS_SUCCEEDED(nsComponentManager::CreateInstance(kLookAndFeelCID, nsnull, NS_GET_IID(nsILookAndFeel), (void**)&touchyFeely))) { PRInt32 tempInt; if (NS_SUCCEEDED(touchyFeely->GetMetric(nsILookAndFeel::eMetric_CaretWidthTwips, tempInt))) mCaretWidth = (nscoord)tempInt; if (NS_SUCCEEDED(touchyFeely->GetMetric(nsILookAndFeel::eMetric_CaretBlinkTime, tempInt))) mBlinkRate = (PRUint32)tempInt; NS_RELEASE(touchyFeely); } // get the selection from the pres shell, and set ourselves up as a selection // listener nsCOMPtr domSelection; nsCOMPtr selCon = do_QueryReferent(mPresShell); if (selCon) { if (NS_SUCCEEDED(selCon->GetSelection(nsISelectionController::SELECTION_NORMAL, getter_AddRefs(domSelection)))) { domSelection->AddSelectionListener(this); mDomSelectionWeak = getter_AddRefs( NS_GetWeakReference(domSelection) ); } } else return NS_ERROR_FAILURE; // set up the blink timer if (mVisible) { nsresult err = StartBlinking(); if (NS_FAILED(err)) return err; } return NS_OK; } //----------------------------------------------------------------------------- NS_IMPL_ADDREF(nsCaret); NS_IMPL_RELEASE(nsCaret); //----------------------------------------------------------------------------- NS_IMETHODIMP nsCaret::QueryInterface(const nsIID& aIID, void** aInstancePtrResult) { NS_PRECONDITION(aInstancePtrResult, "null pointer"); if (!aInstancePtrResult) return NS_ERROR_NULL_POINTER; nsISupports* foundInterface; if (aIID.Equals(NS_GET_IID(nsISupports))) foundInterface = (nsISupports*)(nsICaret*)this; // whoo boy else if (aIID.Equals(NS_GET_IID(nsICaret))) foundInterface = (nsICaret*)this; else if (aIID.Equals(NS_GET_IID(nsIDOMSelectionListener))) foundInterface = (nsIDOMSelectionListener*)this; else foundInterface = nsnull; nsresult status; if (! foundInterface) status = NS_NOINTERFACE; else { NS_ADDREF(foundInterface); status = NS_OK; } *aInstancePtrResult = foundInterface; return status; } //----------------------------------------------------------------------------- NS_IMETHODIMP nsCaret::SetCaretVisible(PRBool inMakeVisible) { mVisible = inMakeVisible; nsresult err = NS_OK; if (mVisible) err = StartBlinking(); else err = StopBlinking(); return err; } //----------------------------------------------------------------------------- NS_IMETHODIMP nsCaret::SetCaretReadOnly(PRBool inMakeReadonly) { mReadOnly = inMakeReadonly; return NS_OK; } //----------------------------------------------------------------------------- NS_IMETHODIMP nsCaret::GetWindowRelativeCoordinates(nsRect& outCoordinates, PRBool& outIsCollapsed, nsIDOMSelection *aDOMSel) { if (!mPresShell) return NS_ERROR_NOT_INITIALIZED; nsCOMPtr domSelection = aDOMSel; nsresult err; if (!domSelection) return NS_ERROR_NOT_INITIALIZED; // no selection // fill in defaults for failure outCoordinates.x = -1; outCoordinates.y = -1; outCoordinates.width = -1; outCoordinates.height = -1; outIsCollapsed = PR_FALSE; err = domSelection->GetIsCollapsed(&outIsCollapsed); if (NS_FAILED(err)) return err; // code in progress 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; /* // is this a text node? nsCOMPtr nodeAsText = do_QueryInterface(focusNode); // note that we only work with text nodes here, unlike when drawing the caret. // this is because this routine is intended for IME support, which only cares about text. if (!nodeAsText) return NS_ERROR_UNEXPECTED; */ nsCOMPtrcontentNode = do_QueryInterface(focusNode); if (!contentNode) return NS_ERROR_FAILURE; //get frame selection and find out what frame to use... nsCOMPtr frameSelection; nsCOMPtr presShell = do_QueryReferent(mPresShell); if (presShell) err = presShell->GetFrameSelection(getter_AddRefs(frameSelection)); else return NS_ERROR_FAILURE; if (NS_FAILED(err) || !frameSelection) return err?err : NS_ERROR_FAILURE; // find the frame that contains the content node that has focus nsIFrame* theFrame = nsnull; PRInt32 theFrameOffset = 0; err = frameSelection->GetFrameForNodeOffset(contentNode, focusOffset, &theFrame, &theFrameOffset); if (NS_FAILED(err) || !theFrame) return err; nsPoint viewOffset(0, 0); nsIView *drawingView; // views are not refcounted GetViewForRendering(theFrame, eTopLevelWindowCoordinates, viewOffset, drawingView); if (!drawingView) return NS_ERROR_UNEXPECTED; // ramp up to make a rendering context for measuring text. // First, we get the pres context ... nsCOMPtr presContext; err = presShell->GetPresContext(getter_AddRefs(presContext)); if (NS_FAILED(err)) return err; // ... then get a device context nsCOMPtr dx; err = presContext->GetDeviceContext(getter_AddRefs(dx)); if (NS_FAILED(err)) return err; if (!dx) return NS_ERROR_UNEXPECTED; // ... then tell it to make a rendering context nsCOMPtr rendContext; err = dx->CreateRenderingContext(drawingView, *getter_AddRefs(rendContext)); if (NS_FAILED(err)) return err; if (!rendContext) return NS_ERROR_UNEXPECTED; // now we can measure the offset into the frame. nsPoint framePos(0, 0); theFrame->GetPointFromOffset(presContext, rendContext, theFrameOffset, &framePos); nsRect frameRect; theFrame->GetRect(frameRect); // 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 = frameRect.height; outCoordinates.width = frameRect.width; return NS_OK; } //----------------------------------------------------------------------------- NS_IMETHODIMP nsCaret::ClearFrameRefs(nsIFrame* aFrame) { if (mLastCaretFrame == aFrame) { mLastCaretFrame = nsnull; // frames are not refcounted. mLastContentOffset = 0; } mDrawn = PR_FALSE; // assume that the view has been cleared, and ensure // that we don't try to use the frame. // should we just call StopBlinking() here? return NS_OK; } #ifdef XP_MAC #pragma mark - #endif //----------------------------------------------------------------------------- NS_IMETHODIMP nsCaret::NotifySelectionChanged(nsIDOMDocument *, nsIDOMSelection *aDomSel, short) { mDomSelectionWeak = getter_AddRefs( NS_GetWeakReference(aDomSel) ); // weak reference to pres shell if (mVisible) { StopBlinking(); StartBlinking(); } return NS_OK; } #ifdef XP_MAC #pragma mark - #endif //----------------------------------------------------------------------------- void nsCaret::KillTimer() { if (mBlinkTimer) { mBlinkTimer->Cancel(); NS_RELEASE(mBlinkTimer); } } //----------------------------------------------------------------------------- nsresult nsCaret::PrimeTimer() { KillTimer(); // set up the blink timer if (!mReadOnly && mBlinkRate > 0) { nsresult err = NS_NewTimer(&mBlinkTimer); if (NS_FAILED(err)) return err; mBlinkTimer->Init(CaretBlinkCallback, this, mBlinkRate, NS_PRIORITY_HIGH, NS_TYPE_REPEATING_PRECISE); } return NS_OK; } //----------------------------------------------------------------------------- nsresult nsCaret::StartBlinking() { PrimeTimer(); //NS_ASSERTION(!mDrawn, "Caret should not be drawn here"); DrawCaret(); // draw it right away return NS_OK; } //----------------------------------------------------------------------------- nsresult nsCaret::StopBlinking() { if (mDrawn) // erase the caret if necessary DrawCaret(); KillTimer(); return NS_OK; } //----------------------------------------------------------------------------- // Get the nsIFrame and the content offset for the current caret position. // Returns PR_TRUE if we should go ahead and draw, PR_FALSE otherwise. // PRBool nsCaret::SetupDrawingFrameAndOffset() { if (!mDomSelectionWeak) return PR_FALSE; nsCOMPtr domSelection = do_QueryReferent(mDomSelectionWeak); PRBool isCollapsed; if (domSelection && NS_SUCCEEDED(domSelection->GetIsCollapsed(&isCollapsed)) && isCollapsed) { // start and end parent should be the same since we are collapsed nsCOMPtr focusNode; PRInt32 contentOffset; if (NS_SUCCEEDED(domSelection->GetFocusNode(getter_AddRefs(focusNode))) && focusNode && NS_SUCCEEDED(domSelection->GetFocusOffset(&contentOffset))) { nsCOMPtrcontentNode = do_QueryInterface(focusNode); if (contentNode) { // see if we have an offset between child nodes, or an offset into a text // node. #if NOT_NEEDED PRBool canContainChildren; if (NS_SUCCEEDED(contentNode->CanContainChildren(canContainChildren)) && canContainChildren) { // point the caret to the start of the child node nsCOMPtr childNode; contentNode->ChildAt(contentOffset, *getter_AddRefs(childNode)); if (childNode) { contentNode = childNode; contentOffset = 0; } } else { // are we in a text node? //nsCOMPtr nodeAsText = do_QueryInterface(focusNode); // we can be in a text node, or a BR node here. } #endif // NOT_NEEDED nsIFrame* theFrame = nsnull; PRInt32 theFrameOffset = 0; nsresult err; //get frame selection and find out what frame to use... nsCOMPtr frameSelection; nsCOMPtr presShell = do_QueryReferent(mPresShell); if (presShell) err = presShell->GetFrameSelection(getter_AddRefs(frameSelection)); else return NS_ERROR_FAILURE; if (NS_FAILED(err) || !frameSelection) return PR_FALSE; err = frameSelection->GetFrameForNodeOffset(contentNode, contentOffset, &theFrame, &theFrameOffset); if (NS_FAILED(err)) return PR_FALSE; else { // mark the frame, so we get notified on deletion. // frames are never unmarked, which means that we'll touch every frame we visit. // this is not ideal. nsFrameState state; theFrame->GetFrameState(&state); state |= NS_FRAME_EXTERNAL_REFERENCE; theFrame->SetFrameState(state); mLastCaretFrame = theFrame; mLastContentOffset = theFrameOffset; return PR_TRUE; } } } } return PR_FALSE; } //----------------------------------------------------------------------------- void nsCaret::GetViewForRendering(nsIFrame *caretFrame, EViewCoordinates coordType, nsPoint &viewOffset, nsIView* &outView) { if (!caretFrame) return; outView = nsnull; NS_ASSERTION(caretFrame, "Should have a frame here"); if (!caretFrame) return; nsIView* theView = nsnull; NS_ASSERTION(caretFrame, "Should have frame here"); nsCOMPtr presContext; nsCOMPtr presShell = do_QueryReferent(mPresShell); if (presShell) presShell->GetPresContext(getter_AddRefs(presContext)); else return; caretFrame->GetOffsetFromView(presContext, viewOffset, &theView); if (theView == nsnull) return; nsIView* returnView = nsnull; nscoord x, y; do { theView->GetPosition(&x, &y); viewOffset.x += x; viewOffset.y += y; if (!returnView) { nsCOMPtr viewWidget; theView->GetWidget(*getter_AddRefs(viewWidget)); if (viewWidget) { returnView = theView; if (coordType == eViewCoordinates) break; } } theView->GetParent(theView); } while (theView); outView = returnView; } /*----------------------------------------------------------------------------- MustDrawCaret FInd out if we need to do any caret drawing. This returns true if either a) or b) a) caret has been drawn, and we need to erase it. b) caret is not drawn, and selection is collapsed ----------------------------------------------------------------------------- */ PRBool nsCaret::MustDrawCaret() { if (mDrawn) return PR_TRUE; nsCOMPtr domSelection = do_QueryReferent(mDomSelectionWeak); PRBool isCollapsed; if (NS_FAILED(domSelection->GetIsCollapsed(&isCollapsed))) return PR_FALSE; return isCollapsed; } /*----------------------------------------------------------------------------- DrawCaretWithContext By this point, the caret rect should have been set up. ----------------------------------------------------------------------------- */ void nsCaret::DrawCaretWithContext(nsIRenderingContext* inRendContext) { NS_ASSERTION(mLastCaretFrame != nsnull, "Should have a frame here"); nsRect frameRect; mLastCaretFrame->GetRect(frameRect); frameRect.x = 0; // the origin is accounted for in GetViewForRendering() frameRect.y = 0; if (frameRect.height == 0) // we're in a BR frame which has zero height. { frameRect.height = 200; frameRect.y -= 200; } nsPoint viewOffset(0, 0); nsIView *drawingView; GetViewForRendering(mLastCaretFrame, eViewCoordinates, viewOffset, drawingView); if (drawingView == nsnull) return; frameRect += viewOffset; nsCOMPtr presContext; nsCOMPtr presShell = do_QueryReferent(mPresShell); if (presShell) { if (NS_FAILED(presShell->GetPresContext(getter_AddRefs(presContext)))) return; } else return; // make a rendering context, if we didn't get passed one nsCOMPtr localRC = do_QueryInterface(inRendContext); // OK if inRendContext is null if (!localRC) { nsCOMPtr dx; if (NS_FAILED(presContext->GetDeviceContext(getter_AddRefs(dx))) || !dx) return; if (NS_FAILED(dx->CreateRenderingContext(drawingView, *getter_AddRefs(localRC))) || !localRC) return; } if (!mDrawn) { nsPoint framePos(0, 0); nsRect caretRect = frameRect; mLastCaretFrame->GetPointFromOffset(presContext, localRC, mLastContentOffset, &framePos); caretRect += framePos; //printf("Content offset %ld, frame offset %ld\n", focusOffset, framePos.x); caretRect.width = mCaretWidth; // Avoid view redraw problems by making sure the // caret doesn't hang outside the right edge of // the frame. This ensures that the caret gets // erased properly if the frame's right edge gets // invalidated. nscoord cX = caretRect.x + caretRect.width; nscoord fX = frameRect.x + frameRect.width; if (caretRect.x <= fX && cX > fX) { caretRect.x -= cX - fX; if (caretRect.x < frameRect.x) caretRect.x = frameRect.x; } mCaretRect = caretRect; } /* if (mReadOnly) inRendContext.SetColor(NS_RGB(85, 85, 85)); // we are drawing it; gray */ localRC->SetColor(NS_RGB(255,255,255)); localRC->InvertRect(mCaretRect); ToggleDrawnStatus(); } //----------------------------------------------------------------------------- void nsCaret::DrawCaret() { // do we need to draw the caret at all? if (!MustDrawCaret()) return; // if we are drawing, not erasing, then set up the frame etc. if (!mDrawn) { if (! SetupDrawingFrameAndOffset()) return; } DrawCaretWithContext(nsnull); } //----------------------------------------------------------------------------- void nsCaret::RefreshDrawCaret(nsIView *aView, nsIRenderingContext& inRendContext, const nsRect& aDirtyRect) { /* if (! SetupDrawingFrameAndOffset()) return; NS_ASSERTION(mLastCaretFrame != nsnull, "Should have a frame here"); nsPoint viewOffset(0, 0); nsIView *drawingView; //GetViewForRendering(viewOffset, drawingView); mLastCaretFrame->GetOffsetFromView(viewOffset, &drawingView); // are we in the view that is being painted? if (drawingView == nsnull || drawingView != aView) return; mDrawn = PR_FALSE; // we're rendering to a view that is being redrawn DrawCaretWithContext(inRendContext); */ } #ifdef XP_MAC #pragma mark - #endif //----------------------------------------------------------------------------- /* static */ void nsCaret::CaretBlinkCallback(nsITimer *aTimer, void *aClosure) { nsCaret *theCaret = NS_REINTERPRET_CAST(nsCaret*, aClosure); if (!theCaret) return; theCaret->DrawCaret(); #ifndef REPEATING_TIMERS theCaret->PrimeTimer(); #endif } //----------------------------------------------------------------------------- nsresult NS_NewCaret(nsICaret** aInstancePtrResult) { NS_PRECONDITION(aInstancePtrResult, "null ptr"); nsCaret* caret = new nsCaret(); if (nsnull == caret) return NS_ERROR_OUT_OF_MEMORY; return caret->QueryInterface(NS_GET_IID(nsICaret), (void**) aInstancePtrResult); }