зеркало из https://github.com/mozilla/pjs.git
514 строки
13 KiB
C++
514 строки
13 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsCOMPtr.h"
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#include "nsITimer.h"
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#include "nsITimerCallback.h"
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#include "nsIFrameSelection.h"
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#include "nsIFrame.h"
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#include "nsIDOMNode.h"
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#include "nsIDOMRange.h"
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#include "nsIDOMSelection.h"
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#include "nsIDOMCharacterData.h"
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#include "nsIContent.h"
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#include "nsIPresShell.h"
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#include "nsIRenderingContext.h"
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#include "nsIDeviceContext.h"
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#include "nsIView.h"
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#include "nsIViewManager.h"
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#include "nsIPresContext.h"
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#include "nsCaretProperties.h"
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#include "nsCaret.h"
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static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
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static NS_DEFINE_IID(kIDOMSelectionIID, NS_IDOMSELECTION_IID);
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static NS_DEFINE_IID(kICaretID, NS_ICARET_IID);
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//-----------------------------------------------------------------------------
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nsCaret::nsCaret()
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: mPresShell(nsnull)
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, mBlinkTimer(nsnull)
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, mBlinkRate(500)
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, mVisible(PR_FALSE)
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, mReadOnly(PR_TRUE)
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, mDrawn(PR_FALSE)
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, mRendContext(nsnull)
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, mLastCaretFrame(nsnull)
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, mLastContentOffset(0)
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{
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NS_INIT_REFCNT();
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}
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//-----------------------------------------------------------------------------
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nsCaret::~nsCaret()
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{
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KillTimer();
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}
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//-----------------------------------------------------------------------------
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NS_IMETHODIMP nsCaret::Init(nsIPresShell *inPresShell, nsCaretProperties *inCaretProperties)
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{
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if (!inPresShell)
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return NS_ERROR_NULL_POINTER;
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if (!inCaretProperties)
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return NS_ERROR_NULL_POINTER;
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mPresShell = inPresShell; // the presshell owns us, so no addref
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mBlinkRate = inCaretProperties->GetCaretBlinkRate();
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mCaretWidth = inCaretProperties->GetCaretWidth();
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// get the selection from the pres shell, and set ourselves up as a selection
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// listener
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nsCOMPtr<nsIDOMSelection> domSelection;
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if (NS_SUCCEEDED(mPresShell->GetSelection(getter_AddRefs(domSelection))))
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{
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domSelection->AddSelectionListener(this);
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}
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// set up the blink timer
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if (mVisible)
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{
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nsresult err = StartBlinking();
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if (NS_FAILED(err))
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return err;
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}
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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NS_IMPL_ADDREF(nsCaret);
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NS_IMPL_RELEASE(nsCaret);
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//-----------------------------------------------------------------------------
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NS_IMETHODIMP nsCaret::QueryInterface(const nsIID& aIID,
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void** aInstancePtrResult)
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{
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NS_PRECONDITION(nsnull != aInstancePtrResult, "null pointer");
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if (nsnull == aInstancePtrResult) {
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return NS_ERROR_NULL_POINTER;
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}
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if (aIID.Equals(kISupportsIID)) {
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*aInstancePtrResult = (void*)(nsISupports*)(nsICaret*)this; // whoo boy
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NS_ADDREF_THIS();
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return NS_OK;
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}
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if (aIID.Equals(nsICaret::GetIID())) {
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*aInstancePtrResult = (void*)(nsICaret*)this;
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NS_ADDREF_THIS();
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return NS_OK;
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}
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if (aIID.Equals(nsIDOMSelectionListener::GetIID())) {
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*aInstancePtrResult = (void*)(nsIDOMSelectionListener*)this;
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NS_ADDREF_THIS();
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return NS_OK;
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}
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return !NS_OK;
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}
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//-----------------------------------------------------------------------------
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NS_IMETHODIMP nsCaret::SetCaretVisible(PRBool inMakeVisible)
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{
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mVisible = inMakeVisible;
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nsresult err = NS_OK;
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if (mVisible)
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err = StartBlinking();
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else
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err = StopBlinking();
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return err;
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}
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//-----------------------------------------------------------------------------
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NS_IMETHODIMP nsCaret::SetCaretReadOnly(PRBool inMakeReadonly)
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{
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mReadOnly = inMakeReadonly;
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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NS_IMETHODIMP nsCaret::Refresh(nsIView *aView, nsIRenderingContext& inRendContext, const nsRect& aDirtyRect)
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{
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// a refresh is different from a simple redraw, in that it does not affect
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// the timer, or toggle the drawn status. It's used to redraw the caret
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// when painting happens, beacuse this will have drawn over the caret.
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if (mVisible && mDrawn)
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{
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RefreshDrawCaret(aView, inRendContext, aDirtyRect);
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}
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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NS_IMETHODIMP nsCaret::ClearFrameRefs(nsIFrame* aFrame)
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{
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if (mLastCaretFrame == aFrame)
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{
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mLastCaretFrame = nsnull; // frames are not refcounted.
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mLastContentOffset = 0;
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}
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// blow away the rendering context, because the frames may well get
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// reflowed before we draw again
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NS_IF_RELEASE(mRendContext); // this nulls the ptr
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// should we just call StopBlinking() here?
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return NS_OK;
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}
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#ifdef XP_MAC
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#pragma mark -
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#endif
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//-----------------------------------------------------------------------------
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NS_IMETHODIMP nsCaret::NotifySelectionChanged()
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{
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if (mVisible)
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{
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StopBlinking();
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StartBlinking();
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}
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return NS_OK;
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}
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#ifdef XP_MAC
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#pragma mark -
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#endif
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//-----------------------------------------------------------------------------
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void nsCaret::KillTimer()
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{
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if (mBlinkTimer)
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{
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mBlinkTimer->Cancel();
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NS_RELEASE(mBlinkTimer);
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}
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}
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//-----------------------------------------------------------------------------
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nsresult nsCaret::PrimeTimer()
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{
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KillTimer();
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// set up the blink timer
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if (!mReadOnly && mBlinkRate > 0)
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{
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nsresult err = NS_NewTimer(&mBlinkTimer);
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if (NS_FAILED(err))
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return err;
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mBlinkTimer->Init(CaretBlinkCallback, this, mBlinkRate);
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}
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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nsresult nsCaret::StartBlinking()
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{
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PrimeTimer();
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ToggleDrawnStatus();
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DrawCaret(); // draw it right away
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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nsresult nsCaret::StopBlinking()
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{
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if (mDrawn) // erase the caret if necessary
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{
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ToggleDrawnStatus();
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DrawCaret();
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}
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// blow away the rendering context, because the frames may well get
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// reflowed before we draw again
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NS_IF_RELEASE(mRendContext); // this nulls the ptr
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KillTimer();
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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// Get the nsIFrame and the content offset for the current caret position.
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// Returns PR_TRUE if we should go ahead and draw, PR_FALSE otherwise.
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//
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PRBool nsCaret::SetupDrawingFrameAndOffset()
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{
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if (!mDrawn)
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{
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return (mLastCaretFrame != nsnull); // if we are going to erase, we just need to have the old frame
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}
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nsCOMPtr<nsIDOMSelection> domSelection;
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nsresult err = mPresShell->GetSelection(getter_AddRefs(domSelection));
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if (!NS_SUCCEEDED(err) || !domSelection)
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return PR_FALSE;
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PRBool isCollapsed;
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if (domSelection && NS_SUCCEEDED(domSelection->IsCollapsed(&isCollapsed)) && isCollapsed)
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{
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// start and end parent should be the same since we are collapsed
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nsCOMPtr<nsIDOMNode> focusNode;
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PRInt32 focusOffset;
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if (NS_SUCCEEDED(domSelection->GetFocusNodeAndOffset(getter_AddRefs(focusNode), &focusOffset)) &&
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focusNode)
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{
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// is this a text node?
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nsCOMPtr<nsIDOMCharacterData> nodeAsText = do_QueryInterface(focusNode);
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if (PR_TRUE || nodeAsText)
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{
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nsCOMPtr<nsIContent>contentNode = do_QueryInterface(focusNode);
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if (contentNode)
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{
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nsIFrame* theFrame = nsnull;
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PRInt32 contentOffset = focusOffset;
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if (NS_SUCCEEDED(mPresShell->GetPrimaryFrameFor(contentNode, &theFrame)) &&
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theFrame && NS_SUCCEEDED(theFrame->GetChildFrameContainingOffset(focusOffset, &focusOffset, &theFrame)))
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{
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// mark the frame, so we get notified on deletion.
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// frames are never unmarked, which means that we'll touch every frame we visit.
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// this is not ideal.
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nsFrameState state;
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theFrame->GetFrameState(&state);
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state |= NS_FRAME_EXTERNAL_REFERENCE;
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theFrame->SetFrameState(state);
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mLastCaretFrame = theFrame;
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mLastContentOffset = contentOffset;
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return PR_TRUE;
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}
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}
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}
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}
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}
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return PR_FALSE;
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}
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//-----------------------------------------------------------------------------
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void nsCaret::GetViewForRendering(nsPoint &viewOffset, nsIView* &outView)
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{
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outView = nsnull;
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nsIView* theView = nsnull;
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mLastCaretFrame->GetOffsetFromView(viewOffset, &theView);
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if (theView == nsnull) return;
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nscoord x, y;
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do {
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theView->GetPosition(&x, &y);
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viewOffset.x += x;
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viewOffset.y += y;
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nsCOMPtr<nsIWidget> viewWidget;
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theView->GetWidget(*getter_AddRefs(viewWidget));
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if (viewWidget) break;
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theView->GetParent(theView);
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} while (theView);
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outView = theView;
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}
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//-----------------------------------------------------------------------------
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void nsCaret::DrawCaretWithContext(nsIRenderingContext& inRendContext)
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{
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NS_ASSERTION(mLastCaretFrame != nsnull, "Should have a frame here");
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nsRect frameRect;
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mLastCaretFrame->GetRect(frameRect);
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frameRect.x = 0; // the origin is accounted for in GetViewForRendering()
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frameRect.y = 0;
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if (0 == frameRect.height)
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{
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frameRect.height = 200;
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frameRect.y += 200;
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}
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nsPoint viewOffset(0, 0);
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nsIView *drawingView;
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GetViewForRendering(viewOffset, drawingView);
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if (drawingView == nsnull)
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return;
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frameRect += viewOffset;
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inRendContext.PushState();
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nsCOMPtr<nsIPresContext> presContext;
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if (NS_SUCCEEDED(mPresShell->GetPresContext(getter_AddRefs(presContext))))
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{
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nsPoint framePos(0, 0);
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mLastCaretFrame->GetPointFromOffset(presContext, &inRendContext, mLastContentOffset, &framePos);
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frameRect += framePos;
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//printf("Content offset %ld, frame offset %ld\n", focusOffset, framePos.x);
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frameRect.width = mCaretWidth;
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mCaretRect = frameRect;
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if (mDrawn)
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{
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if (mReadOnly)
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inRendContext.SetColor(NS_RGB(85, 85, 85)); // we are drawing it; gray
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else
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inRendContext.SetColor(NS_RGB(0, 0, 0)); // we are drawing it; black
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}
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else
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inRendContext.SetColor(NS_RGB(255, 255, 255)); // we are erasing it; white
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inRendContext.FillRect(mCaretRect);
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}
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PRBool dummy;
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inRendContext.PopState(dummy);
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}
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//-----------------------------------------------------------------------------
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void nsCaret::DrawCaret()
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{
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if (! SetupDrawingFrameAndOffset())
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return;
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NS_ASSERTION(mLastCaretFrame != nsnull, "Should have a frame here");
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nsPoint viewOffset(0, 0);
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nsIView *drawingView;
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GetViewForRendering(viewOffset, drawingView);
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if (drawingView)
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{
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// make a rendering context for the first view that has a widget
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if (!mRendContext)
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{
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nsCOMPtr<nsIPresContext> presContext;
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if (NS_SUCCEEDED(mPresShell->GetPresContext(getter_AddRefs(presContext))))
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{
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nsCOMPtr<nsIDeviceContext> dx;
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if (NS_SUCCEEDED(presContext->GetDeviceContext(getter_AddRefs(dx))) && dx)
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{
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dx->CreateRenderingContext(drawingView, mRendContext);
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if (!mRendContext) return;
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}
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}
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mRendContext->PushState(); // save the state. We'll pop then push on drawing
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}
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DrawCaretWithContext(*mRendContext);
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NS_RELEASE(mRendContext);
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}
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}
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//-----------------------------------------------------------------------------
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void nsCaret::RefreshDrawCaret(nsIView *aView, nsIRenderingContext& inRendContext, const nsRect& aDirtyRect)
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{
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if (! SetupDrawingFrameAndOffset())
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return;
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NS_ASSERTION(mLastCaretFrame != nsnull, "Should have a frame here");
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nsPoint viewOffset(0, 0);
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nsIView *drawingView;
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//GetViewForRendering(viewOffset, drawingView);
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mLastCaretFrame->GetOffsetFromView(viewOffset, &drawingView);
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// are we in the view that is being painted?
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if (drawingView == nsnull || drawingView != aView)
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return;
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DrawCaretWithContext(inRendContext);
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}
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#ifdef XP_MAC
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#pragma mark -
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#endif
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//-----------------------------------------------------------------------------
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/* static */
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void nsCaret::CaretBlinkCallback(nsITimer *aTimer, void *aClosure)
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{
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nsCaret *theCaret = NS_REINTERPRET_CAST(nsCaret*, aClosure);
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if (!theCaret) return;
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theCaret->ToggleDrawnStatus();
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theCaret->DrawCaret();
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theCaret->PrimeTimer();
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}
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//-----------------------------------------------------------------------------
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nsresult NS_NewCaret(nsICaret** aInstancePtrResult)
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{
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NS_PRECONDITION(nsnull != aInstancePtrResult, "null ptr");
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nsCaret* caret = new nsCaret();
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if (nsnull == caret)
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return NS_ERROR_OUT_OF_MEMORY;
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return caret->QueryInterface(kICaretID, (void**) aInstancePtrResult);
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}
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