974 lines
31 KiB
C++
974 lines
31 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* the caret is the text cursor used, e.g., when editing */
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#include "nsCaret.h"
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#include <algorithm>
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#include "gfxUtils.h"
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#include "mozilla/gfx/2D.h"
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#include "nsCOMPtr.h"
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#include "nsFontMetrics.h"
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#include "nsITimer.h"
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#include "nsFrameSelection.h"
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#include "nsIFrame.h"
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#include "nsIScrollableFrame.h"
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#include "nsIDOMNode.h"
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#include "nsISelection.h"
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#include "nsISelectionPrivate.h"
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#include "nsIContent.h"
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#include "nsIPresShell.h"
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#include "nsLayoutUtils.h"
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#include "nsPresContext.h"
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#include "nsBlockFrame.h"
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#include "nsISelectionController.h"
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#include "nsTextFrame.h"
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#include "nsXULPopupManager.h"
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#include "nsMenuPopupFrame.h"
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#include "nsTextFragment.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/LookAndFeel.h"
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#include "mozilla/dom/Selection.h"
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#include "nsIBidiKeyboard.h"
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#include "nsContentUtils.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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using namespace mozilla::gfx;
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// The bidi indicator hangs off the caret to one side, to show which
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// direction the typing is in. It needs to be at least 2x2 to avoid looking like
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// an insignificant dot
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static const int32_t kMinBidiIndicatorPixels = 2;
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/**
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* Find the first frame in an in-order traversal of the frame subtree rooted
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* at aFrame which is either a text frame logically at the end of a line,
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* or which is aStopAtFrame. Return null if no such frame is found. We don't
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* descend into the children of non-eLineParticipant frames.
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*/
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static nsIFrame*
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CheckForTrailingTextFrameRecursive(nsIFrame* aFrame, nsIFrame* aStopAtFrame)
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{
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if (aFrame == aStopAtFrame ||
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((aFrame->GetType() == nsGkAtoms::textFrame &&
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(static_cast<nsTextFrame*>(aFrame))->IsAtEndOfLine())))
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return aFrame;
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if (!aFrame->IsFrameOfType(nsIFrame::eLineParticipant))
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return nullptr;
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for (nsIFrame* f : aFrame->PrincipalChildList())
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{
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nsIFrame* r = CheckForTrailingTextFrameRecursive(f, aStopAtFrame);
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if (r)
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return r;
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}
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return nullptr;
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}
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static nsLineBox*
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FindContainingLine(nsIFrame* aFrame)
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{
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while (aFrame && aFrame->IsFrameOfType(nsIFrame::eLineParticipant))
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{
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nsIFrame* parent = aFrame->GetParent();
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nsBlockFrame* blockParent = nsLayoutUtils::GetAsBlock(parent);
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if (blockParent)
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{
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bool isValid;
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nsBlockInFlowLineIterator iter(blockParent, aFrame, &isValid);
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return isValid ? iter.GetLine().get() : nullptr;
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}
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aFrame = parent;
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}
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return nullptr;
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}
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static void
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AdjustCaretFrameForLineEnd(nsIFrame** aFrame, int32_t* aOffset)
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{
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nsLineBox* line = FindContainingLine(*aFrame);
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if (!line)
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return;
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int32_t count = line->GetChildCount();
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for (nsIFrame* f = line->mFirstChild; count > 0; --count, f = f->GetNextSibling())
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{
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nsIFrame* r = CheckForTrailingTextFrameRecursive(f, *aFrame);
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if (r == *aFrame)
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return;
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if (r)
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{
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*aFrame = r;
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NS_ASSERTION(r->GetType() == nsGkAtoms::textFrame, "Expected text frame");
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*aOffset = (static_cast<nsTextFrame*>(r))->GetContentEnd();
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return;
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}
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}
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}
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static bool
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IsBidiUI()
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{
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return Preferences::GetBool("bidi.browser.ui");
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}
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static bool
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CjkThickCaret()
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{
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return Preferences::GetBool("layout.cjkthickcaret");
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}
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nsCaret::nsCaret()
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: mOverrideOffset(0)
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, mBlinkCount(-1)
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, mHideCount(0)
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, mIsBlinkOn(false)
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, mVisible(false)
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, mReadOnly(false)
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, mShowDuringSelection(false)
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, mIgnoreUserModify(true)
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{
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}
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nsCaret::~nsCaret()
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{
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StopBlinking();
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}
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nsresult nsCaret::Init(nsIPresShell *inPresShell)
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{
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NS_ENSURE_ARG(inPresShell);
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mPresShell = do_GetWeakReference(inPresShell); // the presshell owns us, so no addref
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NS_ASSERTION(mPresShell, "Hey, pres shell should support weak refs");
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mShowDuringSelection =
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LookAndFeel::GetInt(LookAndFeel::eIntID_ShowCaretDuringSelection,
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mShowDuringSelection ? 1 : 0) != 0;
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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<nsISelectionController> selCon = do_QueryReferent(mPresShell);
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if (!selCon)
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return NS_ERROR_FAILURE;
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nsCOMPtr<nsISelection> domSelection;
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nsresult rv = selCon->GetSelection(nsISelectionController::SELECTION_NORMAL,
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getter_AddRefs(domSelection));
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if (NS_FAILED(rv))
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return rv;
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if (!domSelection)
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return NS_ERROR_FAILURE;
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nsCOMPtr<nsISelectionPrivate> privateSelection = do_QueryInterface(domSelection);
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if (privateSelection)
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privateSelection->AddSelectionListener(this);
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mDomSelectionWeak = do_GetWeakReference(domSelection);
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return NS_OK;
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}
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static bool
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DrawCJKCaret(nsIFrame* aFrame, int32_t aOffset)
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{
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nsIContent* content = aFrame->GetContent();
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const nsTextFragment* frag = content->GetText();
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if (!frag)
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return false;
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if (aOffset < 0 || uint32_t(aOffset) >= frag->GetLength())
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return false;
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char16_t ch = frag->CharAt(aOffset);
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return 0x2e80 <= ch && ch <= 0xd7ff;
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}
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nsCaret::Metrics
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nsCaret::ComputeMetrics(nsIFrame* aFrame, int32_t aOffset, nscoord aCaretHeight)
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{
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// Compute nominal sizes in appunits
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nscoord caretWidth =
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(aCaretHeight * LookAndFeel::GetFloat(LookAndFeel::eFloatID_CaretAspectRatio, 0.0f)) +
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nsPresContext::CSSPixelsToAppUnits(
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LookAndFeel::GetInt(LookAndFeel::eIntID_CaretWidth, 1));
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if (DrawCJKCaret(aFrame, aOffset) && CjkThickCaret()) {
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caretWidth += nsPresContext::CSSPixelsToAppUnits(1);
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}
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nscoord bidiIndicatorSize = nsPresContext::CSSPixelsToAppUnits(kMinBidiIndicatorPixels);
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bidiIndicatorSize = std::max(caretWidth, bidiIndicatorSize);
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// Round them to device pixels. Always round down, except that anything
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// between 0 and 1 goes up to 1 so we don't let the caret disappear.
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int32_t tpp = aFrame->PresContext()->AppUnitsPerDevPixel();
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Metrics result;
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result.mCaretWidth = NS_ROUND_CARET_TO_PIXELS(caretWidth, tpp);
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result.mBidiIndicatorSize = NS_ROUND_CARET_TO_PIXELS(bidiIndicatorSize, tpp);
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return result;
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}
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void nsCaret::Terminate()
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{
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// this doesn't erase the caret if it's drawn. Should it? We might not have
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// a good drawing environment during teardown.
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StopBlinking();
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mBlinkTimer = nullptr;
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// unregiser ourselves as a selection listener
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nsCOMPtr<nsISelection> domSelection = do_QueryReferent(mDomSelectionWeak);
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nsCOMPtr<nsISelectionPrivate> privateSelection(do_QueryInterface(domSelection));
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if (privateSelection)
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privateSelection->RemoveSelectionListener(this);
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mDomSelectionWeak = nullptr;
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mPresShell = nullptr;
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mOverrideContent = nullptr;
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}
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NS_IMPL_ISUPPORTS(nsCaret, nsISelectionListener)
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nsISelection* nsCaret::GetSelection()
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{
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nsCOMPtr<nsISelection> sel(do_QueryReferent(mDomSelectionWeak));
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return sel;
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}
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void nsCaret::SetSelection(nsISelection *aDOMSel)
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{
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MOZ_ASSERT(aDOMSel);
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mDomSelectionWeak = do_GetWeakReference(aDOMSel); // weak reference to pres shell
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ResetBlinking();
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SchedulePaint();
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}
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void nsCaret::SetVisible(bool inMakeVisible)
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{
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mVisible = inMakeVisible;
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mIgnoreUserModify = mVisible;
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ResetBlinking();
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SchedulePaint();
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}
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bool nsCaret::IsVisible()
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{
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if (!mVisible || mHideCount) {
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return false;
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}
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if (!mShowDuringSelection) {
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Selection* selection = GetSelectionInternal();
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if (!selection) {
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return false;
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}
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bool isCollapsed;
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if (NS_FAILED(selection->GetIsCollapsed(&isCollapsed)) || !isCollapsed) {
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return false;
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}
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}
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if (IsMenuPopupHidingCaret()) {
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return false;
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}
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return true;
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}
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void nsCaret::AddForceHide()
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{
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MOZ_ASSERT(mHideCount < UINT32_MAX);
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if (++mHideCount > 1) {
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return;
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}
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ResetBlinking();
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SchedulePaint();
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}
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void nsCaret::RemoveForceHide()
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{
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if (!mHideCount || --mHideCount) {
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return;
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}
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ResetBlinking();
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SchedulePaint();
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}
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void nsCaret::SetCaretReadOnly(bool inMakeReadonly)
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{
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mReadOnly = inMakeReadonly;
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ResetBlinking();
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SchedulePaint();
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}
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/* static */ nsRect
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nsCaret::GetGeometryForFrame(nsIFrame* aFrame,
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int32_t aFrameOffset,
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nscoord* aBidiIndicatorSize)
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{
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nsPoint framePos(0, 0);
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nsRect rect;
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nsresult rv = aFrame->GetPointFromOffset(aFrameOffset, &framePos);
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if (NS_FAILED(rv)) {
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if (aBidiIndicatorSize) {
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*aBidiIndicatorSize = 0;
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}
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return rect;
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}
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nsIFrame* frame = aFrame->GetContentInsertionFrame();
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if (!frame) {
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frame = aFrame;
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}
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NS_ASSERTION(!(frame->GetStateBits() & NS_FRAME_IN_REFLOW),
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"We should not be in the middle of reflow");
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nscoord baseline = frame->GetCaretBaseline();
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nscoord ascent = 0, descent = 0;
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RefPtr<nsFontMetrics> fm =
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nsLayoutUtils::GetInflatedFontMetricsForFrame(aFrame);
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NS_ASSERTION(fm, "We should be able to get the font metrics");
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if (fm) {
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ascent = fm->MaxAscent();
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descent = fm->MaxDescent();
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}
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nscoord height = ascent + descent;
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WritingMode wm = aFrame->GetWritingMode();
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bool vertical = wm.IsVertical();
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if (vertical) {
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if (wm.IsLineInverted()) {
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framePos.x = baseline - descent;
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} else {
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framePos.x = baseline - ascent;
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}
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} else {
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framePos.y = baseline - ascent;
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}
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Metrics caretMetrics = ComputeMetrics(aFrame, aFrameOffset, height);
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rect = nsRect(framePos, vertical ? nsSize(height, caretMetrics.mCaretWidth) :
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nsSize(caretMetrics.mCaretWidth, height));
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// Clamp the inline-position to be within our scroll frame. If we don't, then
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// it clips us, and we don't appear at all. See bug 335560.
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nsIFrame *scrollFrame =
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nsLayoutUtils::GetClosestFrameOfType(aFrame, nsGkAtoms::scrollFrame);
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if (scrollFrame) {
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// First, use the scrollFrame to get at the scrollable view that we're in.
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nsIScrollableFrame *sf = do_QueryFrame(scrollFrame);
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nsIFrame *scrolled = sf->GetScrolledFrame();
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nsRect caretInScroll = rect + aFrame->GetOffsetTo(scrolled);
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// Now see if the caret extends beyond the view's bounds. If it does,
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// then snap it back, put it as close to the edge as it can.
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if (vertical) {
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nscoord overflow = caretInScroll.YMost() -
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scrolled->GetVisualOverflowRectRelativeToSelf().height;
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if (overflow > 0) {
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rect.y -= overflow;
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}
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} else {
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nscoord overflow = caretInScroll.XMost() -
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scrolled->GetVisualOverflowRectRelativeToSelf().width;
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if (overflow > 0) {
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rect.x -= overflow;
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}
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}
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}
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if (aBidiIndicatorSize) {
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*aBidiIndicatorSize = caretMetrics.mBidiIndicatorSize;
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}
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return rect;
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}
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nsIFrame*
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nsCaret::GetFrameAndOffset(Selection* aSelection,
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nsINode* aOverrideNode, int32_t aOverrideOffset,
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int32_t* aFrameOffset)
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{
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nsINode* focusNode;
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int32_t focusOffset;
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if (aOverrideNode) {
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focusNode = aOverrideNode;
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focusOffset = aOverrideOffset;
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} else if (aSelection) {
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focusNode = aSelection->GetFocusNode();
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aSelection->GetFocusOffset(&focusOffset);
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} else {
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return nullptr;
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}
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if (!focusNode || !focusNode->IsContent()) {
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return nullptr;
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}
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nsIContent* contentNode = focusNode->AsContent();
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nsFrameSelection* frameSelection = aSelection->GetFrameSelection();
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nsBidiLevel bidiLevel = frameSelection->GetCaretBidiLevel();
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nsIFrame* frame;
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nsresult rv = nsCaret::GetCaretFrameForNodeOffset(
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frameSelection, contentNode, focusOffset,
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frameSelection->GetHint(), bidiLevel, &frame, aFrameOffset);
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if (NS_FAILED(rv) || !frame) {
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return nullptr;
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}
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return frame;
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}
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/* static */ nsIFrame*
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nsCaret::GetGeometry(nsISelection* aSelection, nsRect* aRect)
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{
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int32_t frameOffset;
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Selection* selection = aSelection ? aSelection->AsSelection() : nullptr;
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nsIFrame* frame = GetFrameAndOffset(selection, nullptr, 0, &frameOffset);
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if (frame) {
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*aRect = GetGeometryForFrame(frame, frameOffset, nullptr);
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}
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return frame;
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}
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Selection*
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nsCaret::GetSelectionInternal()
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{
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nsISelection* domSelection = GetSelection();
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return domSelection ? domSelection->AsSelection() : nullptr;
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}
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void nsCaret::SchedulePaint()
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{
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Selection* selection = GetSelectionInternal();
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nsINode* focusNode;
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if (mOverrideContent) {
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focusNode = mOverrideContent;
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} else if (selection) {
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focusNode = selection->GetFocusNode();
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} else {
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return;
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}
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if (!focusNode || !focusNode->IsContent()) {
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return;
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}
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nsIFrame* f = focusNode->AsContent()->GetPrimaryFrame();
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if (!f) {
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return;
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}
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// This may not be the correct continuation frame, but that's OK since we're
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// just scheduling a paint of the window (or popup).
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f->SchedulePaint();
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}
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void nsCaret::SetVisibilityDuringSelection(bool aVisibility)
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{
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mShowDuringSelection = aVisibility;
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SchedulePaint();
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}
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void
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nsCaret::SetCaretPosition(nsIDOMNode* aNode, int32_t aOffset)
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{
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mOverrideContent = do_QueryInterface(aNode);
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mOverrideOffset = aOffset;
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ResetBlinking();
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SchedulePaint();
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}
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void
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nsCaret::CheckSelectionLanguageChange()
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{
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if (!IsBidiUI()) {
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return;
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}
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bool isKeyboardRTL = false;
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nsIBidiKeyboard* bidiKeyboard = nsContentUtils::GetBidiKeyboard();
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if (bidiKeyboard) {
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bidiKeyboard->IsLangRTL(&isKeyboardRTL);
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}
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// Call SelectionLanguageChange on every paint. Mostly it will be a noop
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// but it should be fast anyway. This guarantees we never paint the caret
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// at the wrong place.
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Selection* selection = GetSelectionInternal();
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if (selection) {
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selection->SelectionLanguageChange(isKeyboardRTL);
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}
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}
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nsIFrame*
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nsCaret::GetPaintGeometry(nsRect* aRect)
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{
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// Return null if we should not be visible.
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if (!IsVisible() || !mIsBlinkOn) {
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return nullptr;
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}
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// Update selection language direction now so the new direction will be
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// taken into account when computing the caret position below.
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CheckSelectionLanguageChange();
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int32_t frameOffset;
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nsIFrame *frame = GetFrameAndOffset(GetSelectionInternal(),
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mOverrideContent, mOverrideOffset, &frameOffset);
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if (!frame) {
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return nullptr;
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}
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// now we have a frame, check whether it's appropriate to show the caret here
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const nsStyleUserInterface* userinterface = frame->StyleUserInterface();
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if ((!mIgnoreUserModify &&
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userinterface->mUserModify == StyleUserModify::ReadOnly) ||
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userinterface->mUserInput == StyleUserInput::None ||
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userinterface->mUserInput == StyleUserInput::Disabled) {
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return nullptr;
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}
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// If the offset falls outside of the frame, then don't paint the caret.
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int32_t startOffset, endOffset;
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if (frame->GetType() == nsGkAtoms::textFrame &&
|
|
(NS_FAILED(frame->GetOffsets(startOffset, endOffset)) ||
|
|
startOffset > frameOffset ||
|
|
endOffset < frameOffset)) {
|
|
return nullptr;
|
|
}
|
|
|
|
nsRect caretRect;
|
|
nsRect hookRect;
|
|
ComputeCaretRects(frame, frameOffset, &caretRect, &hookRect);
|
|
|
|
aRect->UnionRect(caretRect, hookRect);
|
|
return frame;
|
|
}
|
|
|
|
void nsCaret::PaintCaret(DrawTarget& aDrawTarget,
|
|
nsIFrame* aForFrame,
|
|
const nsPoint &aOffset)
|
|
{
|
|
int32_t contentOffset;
|
|
nsIFrame* frame = GetFrameAndOffset(GetSelectionInternal(),
|
|
mOverrideContent, mOverrideOffset, &contentOffset);
|
|
if (!frame) {
|
|
return;
|
|
}
|
|
NS_ASSERTION(frame == aForFrame, "We're referring different frame");
|
|
|
|
int32_t appUnitsPerDevPixel = frame->PresContext()->AppUnitsPerDevPixel();
|
|
|
|
nsRect caretRect;
|
|
nsRect hookRect;
|
|
ComputeCaretRects(frame, contentOffset, &caretRect, &hookRect);
|
|
|
|
Rect devPxCaretRect =
|
|
NSRectToSnappedRect(caretRect + aOffset, appUnitsPerDevPixel, aDrawTarget);
|
|
Rect devPxHookRect =
|
|
NSRectToSnappedRect(hookRect + aOffset, appUnitsPerDevPixel, aDrawTarget);
|
|
ColorPattern color(ToDeviceColor(frame->GetCaretColorAt(contentOffset)));
|
|
|
|
aDrawTarget.FillRect(devPxCaretRect, color);
|
|
if (!hookRect.IsEmpty()) {
|
|
aDrawTarget.FillRect(devPxHookRect, color);
|
|
}
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsCaret::NotifySelectionChanged(nsIDOMDocument *, nsISelection *aDomSel,
|
|
int16_t aReason)
|
|
{
|
|
if ((aReason & nsISelectionListener::MOUSEUP_REASON) || !IsVisible())//this wont do
|
|
return NS_OK;
|
|
|
|
nsCOMPtr<nsISelection> 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;
|
|
|
|
ResetBlinking();
|
|
SchedulePaint();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void nsCaret::ResetBlinking()
|
|
{
|
|
mIsBlinkOn = true;
|
|
|
|
if (mReadOnly || !mVisible || mHideCount) {
|
|
StopBlinking();
|
|
return;
|
|
}
|
|
|
|
if (mBlinkTimer) {
|
|
mBlinkTimer->Cancel();
|
|
} else {
|
|
nsresult err;
|
|
mBlinkTimer = do_CreateInstance("@mozilla.org/timer;1", &err);
|
|
if (NS_FAILED(err))
|
|
return;
|
|
}
|
|
|
|
uint32_t blinkRate = static_cast<uint32_t>(
|
|
LookAndFeel::GetInt(LookAndFeel::eIntID_CaretBlinkTime, 500));
|
|
if (blinkRate > 0) {
|
|
mBlinkCount = Preferences::GetInt("ui.caretBlinkCount", -1);
|
|
mBlinkTimer->InitWithFuncCallback(CaretBlinkCallback, this, blinkRate,
|
|
nsITimer::TYPE_REPEATING_SLACK);
|
|
}
|
|
}
|
|
|
|
void nsCaret::StopBlinking()
|
|
{
|
|
if (mBlinkTimer)
|
|
{
|
|
mBlinkTimer->Cancel();
|
|
}
|
|
}
|
|
|
|
nsresult
|
|
nsCaret::GetCaretFrameForNodeOffset(nsFrameSelection* aFrameSelection,
|
|
nsIContent* aContentNode,
|
|
int32_t aOffset,
|
|
CaretAssociationHint aFrameHint,
|
|
nsBidiLevel aBidiLevel,
|
|
nsIFrame** aReturnFrame,
|
|
int32_t* aReturnOffset)
|
|
{
|
|
if (!aFrameSelection)
|
|
return NS_ERROR_FAILURE;
|
|
nsIPresShell* presShell = aFrameSelection->GetShell();
|
|
if (!presShell)
|
|
return NS_ERROR_FAILURE;
|
|
|
|
if (!aContentNode || !aContentNode->IsInComposedDoc() ||
|
|
presShell->GetDocument() != aContentNode->GetComposedDoc())
|
|
return NS_ERROR_FAILURE;
|
|
|
|
nsIFrame* theFrame = nullptr;
|
|
int32_t theFrameOffset = 0;
|
|
|
|
theFrame = aFrameSelection->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 <br> 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 visibility->mDirection
|
|
// ------------------
|
|
// NS_STYLE_DIRECTION_LTR : LTR or Default
|
|
// NS_STYLE_DIRECTION_RTL
|
|
if (theFrame->PresContext()->BidiEnabled())
|
|
{
|
|
// 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 = theFrame->GetEmbeddingLevel();
|
|
}
|
|
|
|
int32_t start;
|
|
int32_t end;
|
|
nsIFrame* frameBefore;
|
|
nsIFrame* frameAfter;
|
|
nsBidiLevel levelBefore; // Bidi level of the character before the caret
|
|
nsBidiLevel levelAfter; // Bidi level of the character after the caret
|
|
|
|
theFrame->GetOffsets(start, end);
|
|
if (start == 0 || end == 0 || start == theFrameOffset || end == theFrameOffset)
|
|
{
|
|
nsPrevNextBidiLevels levels = aFrameSelection->
|
|
GetPrevNextBidiLevels(aContentNode, aOffset, 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 = std::max(aBidiLevel, std::min(levelBefore, levelAfter)); // rule c3
|
|
aBidiLevel = std::min(aBidiLevel, std::max(levelBefore, levelAfter)); // rule c4
|
|
if (aBidiLevel == levelBefore // rule c1
|
|
|| (aBidiLevel > levelBefore && aBidiLevel < levelAfter &&
|
|
IS_SAME_DIRECTION(aBidiLevel, levelBefore)) // rule c5
|
|
|| (aBidiLevel < levelBefore && aBidiLevel > levelAfter &&
|
|
IS_SAME_DIRECTION(aBidiLevel, levelBefore))) // 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.
|
|
nsBidiLevel baseLevel = frameAfter->GetBaseLevel();
|
|
if (baseLevel != levelAfter)
|
|
{
|
|
nsPeekOffsetStruct pos(eSelectBeginLine, eDirPrevious, 0,
|
|
nsPoint(0, 0), false, true, false,
|
|
true, false);
|
|
if (NS_SUCCEEDED(frameAfter->PeekOffset(&pos))) {
|
|
theFrame = pos.mResultFrame;
|
|
theFrameOffset = pos.mContentOffset;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (aBidiLevel == levelAfter // rule c2
|
|
|| (aBidiLevel > levelBefore && aBidiLevel < levelAfter &&
|
|
IS_SAME_DIRECTION(aBidiLevel, levelAfter)) // rule c6
|
|
|| (aBidiLevel < levelBefore && aBidiLevel > levelAfter &&
|
|
IS_SAME_DIRECTION(aBidiLevel, levelAfter))) // 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.
|
|
nsBidiLevel baseLevel = frameBefore->GetBaseLevel();
|
|
if (baseLevel != levelBefore)
|
|
{
|
|
nsPeekOffsetStruct pos(eSelectEndLine, eDirNext, 0,
|
|
nsPoint(0, 0), false, true, false,
|
|
true, false);
|
|
if (NS_SUCCEEDED(frameBefore->PeekOffset(&pos))) {
|
|
theFrame = pos.mResultFrame;
|
|
theFrameOffset = pos.mContentOffset;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if (aBidiLevel > levelBefore && aBidiLevel < levelAfter // rule c7/8
|
|
&& IS_SAME_DIRECTION(levelBefore, levelAfter) // before and after have the same parity
|
|
&& !IS_SAME_DIRECTION(aBidiLevel, levelAfter)) // caret has different parity
|
|
{
|
|
if (NS_SUCCEEDED(aFrameSelection->GetFrameFromLevel(frameAfter, eDirNext, aBidiLevel, &theFrame)))
|
|
{
|
|
theFrame->GetOffsets(start, end);
|
|
levelAfter = theFrame->GetEmbeddingLevel();
|
|
if (IS_LEVEL_RTL(aBidiLevel)) // c8: caret to the right of the rightmost character
|
|
theFrameOffset = IS_LEVEL_RTL(levelAfter) ? start : end;
|
|
else // c7: caret to the left of the leftmost character
|
|
theFrameOffset = IS_LEVEL_RTL(levelAfter) ? end : start;
|
|
}
|
|
}
|
|
else if (aBidiLevel < levelBefore && aBidiLevel > levelAfter // rule c11/12
|
|
&& IS_SAME_DIRECTION(levelBefore, levelAfter) // before and after have the same parity
|
|
&& !IS_SAME_DIRECTION(aBidiLevel, levelAfter)) // caret has different parity
|
|
{
|
|
if (NS_SUCCEEDED(aFrameSelection->GetFrameFromLevel(frameBefore, eDirPrevious, aBidiLevel, &theFrame)))
|
|
{
|
|
theFrame->GetOffsets(start, end);
|
|
levelBefore = theFrame->GetEmbeddingLevel();
|
|
if (IS_LEVEL_RTL(aBidiLevel)) // c12: caret to the left of the leftmost character
|
|
theFrameOffset = IS_LEVEL_RTL(levelBefore) ? end : start;
|
|
else // c11: caret to the right of the rightmost character
|
|
theFrameOffset = IS_LEVEL_RTL(levelBefore) ? start : end;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
*aReturnFrame = theFrame;
|
|
*aReturnOffset = theFrameOffset;
|
|
return NS_OK;
|
|
}
|
|
|
|
size_t nsCaret::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
|
|
{
|
|
size_t total = aMallocSizeOf(this);
|
|
if (mPresShell) {
|
|
// We only want the size of the nsWeakReference object, not the PresShell
|
|
// (since we don't own the PresShell).
|
|
total += mPresShell->SizeOfOnlyThis(aMallocSizeOf);
|
|
}
|
|
if (mDomSelectionWeak) {
|
|
// We only want size of the nsWeakReference object, not the selection
|
|
// (again, we don't own the selection).
|
|
total += mDomSelectionWeak->SizeOfOnlyThis(aMallocSizeOf);
|
|
}
|
|
if (mBlinkTimer) {
|
|
total += mBlinkTimer->SizeOfIncludingThis(aMallocSizeOf);
|
|
}
|
|
return total;
|
|
}
|
|
|
|
bool nsCaret::IsMenuPopupHidingCaret()
|
|
{
|
|
#ifdef MOZ_XUL
|
|
// Check if there are open popups.
|
|
nsXULPopupManager *popMgr = nsXULPopupManager::GetInstance();
|
|
nsTArray<nsIFrame*> popups;
|
|
popMgr->GetVisiblePopups(popups);
|
|
|
|
if (popups.Length() == 0)
|
|
return 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<nsIDOMNode> node;
|
|
nsCOMPtr<nsISelection> domSelection = do_QueryReferent(mDomSelectionWeak);
|
|
if (!domSelection)
|
|
return true; // No selection/caret to draw.
|
|
domSelection->GetFocusNode(getter_AddRefs(node));
|
|
if (!node)
|
|
return true; // No selection/caret to draw.
|
|
nsCOMPtr<nsIContent> caretContent = do_QueryInterface(node);
|
|
if (!caretContent)
|
|
return 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 (uint32_t i=0; i<popups.Length(); i++) {
|
|
nsMenuPopupFrame* popupFrame = static_cast<nsMenuPopupFrame*>(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 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 true;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
// There are no open menu popups, no need to hide the caret.
|
|
return false;
|
|
}
|
|
|
|
void
|
|
nsCaret::ComputeCaretRects(nsIFrame* aFrame, int32_t aFrameOffset,
|
|
nsRect* aCaretRect, nsRect* aHookRect)
|
|
{
|
|
NS_ASSERTION(aFrame, "Should have a frame here");
|
|
|
|
WritingMode wm = aFrame->GetWritingMode();
|
|
bool isVertical = wm.IsVertical();
|
|
|
|
nscoord bidiIndicatorSize;
|
|
*aCaretRect = GetGeometryForFrame(aFrame, aFrameOffset, &bidiIndicatorSize);
|
|
|
|
// on RTL frames the right edge of mCaretRect must be equal to framePos
|
|
const nsStyleVisibility* vis = aFrame->StyleVisibility();
|
|
if (NS_STYLE_DIRECTION_RTL == vis->mDirection) {
|
|
if (isVertical) {
|
|
aCaretRect->y -= aCaretRect->height;
|
|
} else {
|
|
aCaretRect->x -= aCaretRect->width;
|
|
}
|
|
}
|
|
|
|
// Simon -- make a hook to draw to the left or right of the caret to show keyboard language direction
|
|
aHookRect->SetEmpty();
|
|
if (!IsBidiUI()) {
|
|
return;
|
|
}
|
|
|
|
bool isCaretRTL;
|
|
nsIBidiKeyboard* bidiKeyboard = nsContentUtils::GetBidiKeyboard();
|
|
// if bidiKeyboard->IsLangRTL() fails, 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.
|
|
if (bidiKeyboard && NS_SUCCEEDED(bidiKeyboard->IsLangRTL(&isCaretRTL))) {
|
|
// 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.
|
|
if (isVertical) {
|
|
bool isSidewaysLR = wm.IsVerticalLR() && !wm.IsLineInverted();
|
|
if (isSidewaysLR) {
|
|
aHookRect->SetRect(aCaretRect->x + bidiIndicatorSize,
|
|
aCaretRect->y + (!isCaretRTL ? bidiIndicatorSize * -1 :
|
|
aCaretRect->height),
|
|
aCaretRect->height,
|
|
bidiIndicatorSize);
|
|
} else {
|
|
aHookRect->SetRect(aCaretRect->XMost() - bidiIndicatorSize,
|
|
aCaretRect->y + (isCaretRTL ? bidiIndicatorSize * -1 :
|
|
aCaretRect->height),
|
|
aCaretRect->height,
|
|
bidiIndicatorSize);
|
|
}
|
|
} else {
|
|
aHookRect->SetRect(aCaretRect->x + (isCaretRTL ? bidiIndicatorSize * -1 :
|
|
aCaretRect->width),
|
|
aCaretRect->y + bidiIndicatorSize,
|
|
bidiIndicatorSize,
|
|
aCaretRect->width);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* static */
|
|
void nsCaret::CaretBlinkCallback(nsITimer* aTimer, void* aClosure)
|
|
{
|
|
nsCaret* theCaret = reinterpret_cast<nsCaret*>(aClosure);
|
|
if (!theCaret) {
|
|
return;
|
|
}
|
|
theCaret->mIsBlinkOn = !theCaret->mIsBlinkOn;
|
|
theCaret->SchedulePaint();
|
|
|
|
// mBlinkCount of -1 means blink count is not enabled.
|
|
if (theCaret->mBlinkCount == -1) {
|
|
return;
|
|
}
|
|
|
|
// Track the blink count, but only at end of a blink cycle.
|
|
if (!theCaret->mIsBlinkOn) {
|
|
// If we exceeded the blink count, stop the timer.
|
|
if (--theCaret->mBlinkCount <= 0) {
|
|
theCaret->StopBlinking();
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
nsCaret::SetIgnoreUserModify(bool aIgnoreUserModify)
|
|
{
|
|
mIgnoreUserModify = aIgnoreUserModify;
|
|
SchedulePaint();
|
|
}
|