forked from mirrors/gecko-dev
1f3b6b7927
Currently, `mSelection` is cached only when `mText` is some, text rects are cached only when `mSelection` is cached. However, as far as widget can work with IME, it should cache content as far as possible. Therefore, this patch makes it keep querying content data even after something fails. Differential Revision: https://phabricator.services.mozilla.com/D137431
555 lines
21 KiB
C++
555 lines
21 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=8 et :
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*/
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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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#ifndef mozilla_ContentCache_h
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#define mozilla_ContentCache_h
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#include <stdint.h>
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#include "mozilla/widget/IMEData.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/CheckedInt.h"
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#include "mozilla/EventForwards.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/ToString.h"
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#include "mozilla/WritingModes.h"
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#include "nsString.h"
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#include "nsTArray.h"
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#include "Units.h"
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class nsIWidget;
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namespace mozilla {
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class ContentCacheInParent;
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namespace dom {
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class BrowserParent;
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} // namespace dom
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/**
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* ContentCache stores various information of the child content.
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* This class has members which are necessary both in parent process and
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* content process.
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*/
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class ContentCache {
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public:
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typedef CopyableTArray<LayoutDeviceIntRect> RectArray;
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typedef widget::IMENotification IMENotification;
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ContentCache() = default;
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protected:
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// Whole text in the target
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Maybe<nsString> mText;
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// Start offset of the composition string.
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Maybe<uint32_t> mCompositionStart;
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enum { ePrevCharRect = 1, eNextCharRect = 0 };
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struct Selection final {
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// Following values are offset in "flat text".
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uint32_t mAnchor;
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uint32_t mFocus;
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WritingMode mWritingMode;
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bool mHasRange;
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// Character rects at previous and next character of mAnchor and mFocus.
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// The reason why ContentCache needs to store each previous character of
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// them is IME may query character rect of the last character of a line
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// when caret is at the end of the line.
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// Note that use ePrevCharRect and eNextCharRect for accessing each item.
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LayoutDeviceIntRect mAnchorCharRects[2];
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LayoutDeviceIntRect mFocusCharRects[2];
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// Whole rect of selected text. This is empty if the selection is collapsed.
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LayoutDeviceIntRect mRect;
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Selection() : mAnchor(UINT32_MAX), mFocus(UINT32_MAX), mHasRange(false) {
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ClearRects();
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};
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explicit Selection(
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const IMENotification::SelectionChangeDataBase& aSelectionChangeData)
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: mAnchor(UINT32_MAX),
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mFocus(UINT32_MAX),
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mWritingMode(aSelectionChangeData.GetWritingMode()),
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mHasRange(aSelectionChangeData.HasRange()) {
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if (mHasRange) {
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mAnchor = aSelectionChangeData.AnchorOffset();
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mFocus = aSelectionChangeData.FocusOffset();
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}
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}
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explicit Selection(const WidgetQueryContentEvent& aQuerySelectedTextEvent);
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void ClearRects() {
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for (auto& rect : mAnchorCharRects) {
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rect.SetEmpty();
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}
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for (auto& rect : mFocusCharRects) {
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rect.SetEmpty();
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}
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mRect.SetEmpty();
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}
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bool HasRects() const {
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for (auto& rect : mAnchorCharRects) {
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if (!rect.IsEmpty()) {
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return true;
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}
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}
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for (auto& rect : mFocusCharRects) {
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if (!rect.IsEmpty()) {
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return true;
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}
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}
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return !mRect.IsEmpty();
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}
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bool IsCollapsed() const { return !mHasRange || mFocus == mAnchor; }
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bool Reversed() const {
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MOZ_ASSERT(mHasRange);
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return mFocus < mAnchor;
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}
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uint32_t StartOffset() const {
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MOZ_ASSERT(mHasRange);
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return Reversed() ? mFocus : mAnchor;
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}
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uint32_t EndOffset() const {
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MOZ_ASSERT(mHasRange);
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return Reversed() ? mAnchor : mFocus;
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}
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uint32_t Length() const {
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MOZ_ASSERT(mHasRange);
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return Reversed() ? mAnchor - mFocus : mFocus - mAnchor;
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}
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LayoutDeviceIntRect StartCharRect() const {
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return Reversed() ? mFocusCharRects[eNextCharRect]
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: mAnchorCharRects[eNextCharRect];
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}
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LayoutDeviceIntRect EndCharRect() const {
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return Reversed() ? mAnchorCharRects[eNextCharRect]
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: mFocusCharRects[eNextCharRect];
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}
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friend std::ostream& operator<<(std::ostream& aStream,
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const Selection& aSelection) {
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aStream << "{ ";
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if (!aSelection.mHasRange) {
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aStream << "HasRange()=false";
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} else {
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aStream << "mAnchor=" << aSelection.mAnchor
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<< ", mFocus=" << aSelection.mFocus << ", mWritingMode="
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<< ToString(aSelection.mWritingMode).c_str();
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}
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if (aSelection.HasRects()) {
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if (aSelection.mAnchor > 0) {
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aStream << ", mAnchorCharRects[ePrevCharRect]="
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<< aSelection.mAnchorCharRects[ContentCache::ePrevCharRect];
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}
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aStream << ", mAnchorCharRects[eNextCharRect]="
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<< aSelection.mAnchorCharRects[ContentCache::eNextCharRect];
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if (aSelection.mFocus > 0) {
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aStream << ", mFocusCharRects[ePrevCharRect]="
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<< aSelection.mFocusCharRects[ContentCache::ePrevCharRect];
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}
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aStream << ", mFocusCharRects[eNextCharRect]="
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<< aSelection.mFocusCharRects[ContentCache::eNextCharRect]
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<< ", mRect=" << aSelection.mRect;
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}
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if (aSelection.mHasRange) {
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aStream << ", Reversed()=" << (aSelection.Reversed() ? "true" : "false")
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<< ", StartOffset()=" << aSelection.StartOffset()
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<< ", EndOffset()=" << aSelection.EndOffset()
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<< ", IsCollapsed()="
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<< (aSelection.IsCollapsed() ? "true" : "false")
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<< ", Length()=" << aSelection.Length();
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}
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aStream << " }";
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return aStream;
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}
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};
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Maybe<Selection> mSelection;
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// Stores first char rect because Yosemite's Japanese IME sometimes tries
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// to query it. If there is no text, this is caret rect.
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LayoutDeviceIntRect mFirstCharRect;
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struct Caret final {
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uint32_t mOffset;
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LayoutDeviceIntRect mRect;
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explicit Caret(uint32_t aOffset, LayoutDeviceIntRect aCaretRect)
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: mOffset(aOffset), mRect(aCaretRect) {}
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uint32_t Offset() const { return mOffset; }
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bool HasRect() const { return !mRect.IsEmpty(); }
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friend std::ostream& operator<<(std::ostream& aStream,
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const Caret& aCaret) {
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aStream << "{ mOffset=" << aCaret.mOffset;
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if (aCaret.HasRect()) {
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aStream << ", mRect=" << aCaret.mRect;
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}
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return aStream << " }";
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}
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private:
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Caret() = default;
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friend struct IPC::ParamTraits<ContentCache::Caret>;
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friend struct IPC::ParamTraits<Maybe<ContentCache::Caret>>;
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};
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Maybe<Caret> mCaret;
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struct TextRectArray final {
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uint32_t mStart;
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RectArray mRects;
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explicit TextRectArray(uint32_t aStartOffset) : mStart(aStartOffset) {}
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bool HasRects() const { return Length() > 0; }
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uint32_t StartOffset() const { return mStart; }
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uint32_t EndOffset() const {
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CheckedInt<uint32_t> endOffset =
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CheckedInt<uint32_t>(mStart) + mRects.Length();
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return endOffset.isValid() ? endOffset.value() : UINT32_MAX;
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}
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uint32_t Length() const { return EndOffset() - mStart; }
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bool IsOffsetInRange(uint32_t aOffset) const {
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return StartOffset() <= aOffset && aOffset < EndOffset();
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}
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bool IsRangeCompletelyInRange(uint32_t aOffset, uint32_t aLength) const {
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CheckedInt<uint32_t> endOffset = CheckedInt<uint32_t>(aOffset) + aLength;
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if (NS_WARN_IF(!endOffset.isValid())) {
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return false;
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}
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return IsOffsetInRange(aOffset) && aOffset + aLength <= EndOffset();
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}
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bool IsOverlappingWith(uint32_t aOffset, uint32_t aLength) const {
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if (!HasRects() || aOffset == UINT32_MAX || !aLength) {
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return false;
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}
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CheckedInt<uint32_t> endOffset = CheckedInt<uint32_t>(aOffset) + aLength;
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if (NS_WARN_IF(!endOffset.isValid())) {
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return false;
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}
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return aOffset < EndOffset() && endOffset.value() > mStart;
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}
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LayoutDeviceIntRect GetRect(uint32_t aOffset) const;
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LayoutDeviceIntRect GetUnionRect(uint32_t aOffset, uint32_t aLength) const;
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LayoutDeviceIntRect GetUnionRectAsFarAsPossible(
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uint32_t aOffset, uint32_t aLength, bool aRoundToExistingOffset) const;
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friend std::ostream& operator<<(std::ostream& aStream,
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const TextRectArray& aTextRectArray) {
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aStream << "{ mStart=" << aTextRectArray.mStart
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<< ", mRects={ Length()=" << aTextRectArray.Length();
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if (aTextRectArray.HasRects()) {
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aStream << ", Elements()=[ ";
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static constexpr uint32_t kMaxPrintRects = 4;
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const uint32_t kFirstHalf = aTextRectArray.Length() <= kMaxPrintRects
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? UINT32_MAX
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: (kMaxPrintRects + 1) / 2;
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const uint32_t kSecondHalf =
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aTextRectArray.Length() <= kMaxPrintRects ? 0 : kMaxPrintRects / 2;
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for (uint32_t i = 0; i < aTextRectArray.Length(); i++) {
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if (i > 0) {
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aStream << ", ";
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}
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aStream << ToString(aTextRectArray.mRects[i]).c_str();
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if (i + 1 == kFirstHalf) {
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aStream << " ...";
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i = aTextRectArray.Length() - kSecondHalf - 1;
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}
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}
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}
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return aStream << " ] } }";
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}
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private:
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TextRectArray() = default;
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friend struct IPC::ParamTraits<ContentCache::TextRectArray>;
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friend struct IPC::ParamTraits<Maybe<ContentCache::TextRectArray>>;
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};
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Maybe<TextRectArray> mTextRectArray;
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Maybe<TextRectArray> mLastCommitStringTextRectArray;
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LayoutDeviceIntRect mEditorRect;
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friend class ContentCacheInParent;
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friend struct IPC::ParamTraits<ContentCache>;
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friend struct IPC::ParamTraits<ContentCache::Selection>;
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friend struct IPC::ParamTraits<ContentCache::Caret>;
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friend struct IPC::ParamTraits<ContentCache::TextRectArray>;
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friend std::ostream& operator<<(
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std::ostream& aStream,
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const Selection& aSelection); // For e(Prev|Next)CharRect
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};
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class ContentCacheInChild final : public ContentCache {
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public:
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ContentCacheInChild() = default;
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/**
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* Called when composition event will be dispatched in this process from
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* PuppetWidget.
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*/
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void OnCompositionEvent(const WidgetCompositionEvent& aCompositionEvent);
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/**
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* When IME loses focus, this should be called and making this forget the
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* content for reducing footprint.
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*/
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void Clear();
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/**
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* Cache*() retrieves the latest content information and store them.
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* Be aware, CacheSelection() calls CacheTextRects(), and also CacheText()
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* calls CacheSelection(). So, related data is also retrieved automatically.
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*/
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bool CacheEditorRect(nsIWidget* aWidget,
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const IMENotification* aNotification = nullptr);
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bool CacheSelection(nsIWidget* aWidget,
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const IMENotification* aNotification = nullptr);
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bool CacheText(nsIWidget* aWidget,
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const IMENotification* aNotification = nullptr);
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bool CacheAll(nsIWidget* aWidget,
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const IMENotification* aNotification = nullptr);
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/**
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* SetSelection() modifies selection with specified raw data. And also this
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* tries to retrieve text rects too.
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*/
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void SetSelection(
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nsIWidget* aWidget,
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const IMENotification::SelectionChangeDataBase& aSelectionChangeData);
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private:
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bool QueryCharRect(nsIWidget* aWidget, uint32_t aOffset,
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LayoutDeviceIntRect& aCharRect) const;
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bool QueryCharRectArray(nsIWidget* aWidget, uint32_t aOffset,
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uint32_t aLength, RectArray& aCharRectArray) const;
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bool CacheCaret(nsIWidget* aWidget,
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const IMENotification* aNotification = nullptr);
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bool CacheTextRects(nsIWidget* aWidget,
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const IMENotification* aNotification = nullptr);
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// Once composition is committed, all of the commit string may be composed
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// again by Kakutei-Undo of Japanese IME. Therefore, we need to keep
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// storing the last composition start to cache all character rects of the
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// last commit string.
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Maybe<OffsetAndData<uint32_t>> mLastCommit;
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};
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class ContentCacheInParent final : public ContentCache {
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public:
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explicit ContentCacheInParent(dom::BrowserParent& aBrowserParent);
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/**
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* AssignContent() is called when BrowserParent receives ContentCache from
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* the content process. This doesn't copy composition information because
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* it's managed by BrowserParent itself.
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*/
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void AssignContent(const ContentCache& aOther, nsIWidget* aWidget,
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const IMENotification* aNotification = nullptr);
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/**
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* HandleQueryContentEvent() sets content data to aEvent.mReply.
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*
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* For eQuerySelectedText, fail if the cache doesn't contain the whole
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* selected range. (This shouldn't happen because PuppetWidget should have
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* already sent the whole selection.)
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*
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* For eQueryTextContent, fail only if the cache doesn't overlap with
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* the queried range. Note the difference from above. We use
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* this behavior because a normal eQueryTextContent event is allowed to
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* have out-of-bounds offsets, so that widget can request content without
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* knowing the exact length of text. It's up to widget to handle cases when
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* the returned offset/length are different from the queried offset/length.
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*
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* For eQueryTextRect, fail if cached offset/length aren't equals to input.
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* Cocoa widget always queries selected offset, so it works on it.
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*
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* For eQueryCaretRect, fail if cached offset isn't equals to input
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*
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* For eQueryEditorRect, always success
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*/
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bool HandleQueryContentEvent(WidgetQueryContentEvent& aEvent,
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nsIWidget* aWidget) const;
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/**
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* OnCompositionEvent() should be called before sending composition string.
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* This returns true if the event should be sent. Otherwise, false.
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*/
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bool OnCompositionEvent(const WidgetCompositionEvent& aCompositionEvent);
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/**
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* OnSelectionEvent() should be called before sending selection event.
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*/
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void OnSelectionEvent(const WidgetSelectionEvent& aSelectionEvent);
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/**
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* OnEventNeedingAckHandled() should be called after the child process
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* handles a sent event which needs acknowledging.
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*
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* WARNING: This may send notifications to IME. That might cause destroying
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* BrowserParent or aWidget. Therefore, the caller must not destroy
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* this instance during a call of this method.
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*/
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void OnEventNeedingAckHandled(nsIWidget* aWidget, EventMessage aMessage);
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/**
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* RequestIMEToCommitComposition() requests aWidget to commit or cancel
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* composition. If it's handled synchronously, this returns true.
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*
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* @param aWidget The widget to be requested to commit or cancel
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* the composition.
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* @param aCancel When the caller tries to cancel the composition, true.
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* Otherwise, i.e., tries to commit the composition, false.
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* @param aCommittedString The committed string (i.e., the last data of
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* dispatched composition events during requesting
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* IME to commit composition.
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* @return Whether the composition is actually committed
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* synchronously.
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*/
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bool RequestIMEToCommitComposition(nsIWidget* aWidget, bool aCancel,
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nsAString& aCommittedString);
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/**
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* MaybeNotifyIME() may notify IME of the notification. If child process
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* hasn't been handled all sending events yet, this stores the notification
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* and flush it later.
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*/
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void MaybeNotifyIME(nsIWidget* aWidget, const IMENotification& aNotification);
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private:
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IMENotification mPendingSelectionChange;
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IMENotification mPendingTextChange;
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IMENotification mPendingLayoutChange;
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IMENotification mPendingCompositionUpdate;
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#if MOZ_DIAGNOSTIC_ASSERT_ENABLED
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// Log of event messages to be output to crash report.
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nsTArray<EventMessage> mDispatchedEventMessages;
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nsTArray<EventMessage> mReceivedEventMessages;
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// Log of RequestIMEToCommitComposition() in the last 2 compositions.
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enum class RequestIMEToCommitCompositionResult : uint8_t {
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eToOldCompositionReceived,
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eToCommittedCompositionReceived,
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eReceivedAfterBrowserParentBlur,
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eReceivedButNoTextComposition,
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eHandledAsynchronously,
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eHandledSynchronously,
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};
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const char* ToReadableText(
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RequestIMEToCommitCompositionResult aResult) const {
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switch (aResult) {
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case RequestIMEToCommitCompositionResult::eToOldCompositionReceived:
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return "Commit request is not handled because it's for "
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"older composition";
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case RequestIMEToCommitCompositionResult::eToCommittedCompositionReceived:
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return "Commit request is not handled because BrowserParent has "
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"already "
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"sent commit event for the composition";
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case RequestIMEToCommitCompositionResult::eReceivedAfterBrowserParentBlur:
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return "Commit request is handled with stored composition string "
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"because BrowserParent has already lost focus";
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case RequestIMEToCommitCompositionResult::eReceivedButNoTextComposition:
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return "Commit request is not handled because there is no "
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"TextCompsition instance";
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case RequestIMEToCommitCompositionResult::eHandledAsynchronously:
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return "Commit request is handled but IME doesn't commit current "
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"composition synchronously";
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case RequestIMEToCommitCompositionResult::eHandledSynchronously:
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return "Commit reqeust is handled synchronously";
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default:
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return "Unknown reason";
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}
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}
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nsTArray<RequestIMEToCommitCompositionResult>
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mRequestIMEToCommitCompositionResults;
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#endif // MOZ_DIAGNOSTIC_ASSERT_ENABLED
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// mBrowserParent is owner of the instance.
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dom::BrowserParent& MOZ_NON_OWNING_REF mBrowserParent;
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// mCompositionString is composition string which were sent to the remote
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// process but not yet committed in the remote process.
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nsString mCompositionString;
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// This is not nullptr only while the instance is requesting IME to
|
|
// composition. Then, data value of dispatched composition events should
|
|
// be stored into the instance.
|
|
nsAString* mCommitStringByRequest;
|
|
// mPendingEventsNeedingAck is increased before sending a composition event or
|
|
// a selection event and decreased after they are received in the child
|
|
// process.
|
|
uint32_t mPendingEventsNeedingAck;
|
|
// mCompositionStartInChild stores current composition start offset in the
|
|
// remote process.
|
|
Maybe<uint32_t> mCompositionStartInChild;
|
|
// mPendingCommitLength is commit string length of the first pending
|
|
// composition. This is used by relative offset query events when querying
|
|
// new composition start offset.
|
|
// Note that when mPendingCompositionCount is not 0, i.e., there are 2 or
|
|
// more pending compositions, this cache won't be used because in such case,
|
|
// anyway ContentCacheInParent cannot return proper character rect.
|
|
uint32_t mPendingCommitLength;
|
|
// mPendingCompositionCount is number of compositions which started in widget
|
|
// but not yet handled in the child process.
|
|
uint8_t mPendingCompositionCount;
|
|
// mPendingCommitCount is number of eCompositionCommit(AsIs) events which
|
|
// were sent to the child process but not yet handled in it.
|
|
uint8_t mPendingCommitCount;
|
|
// mWidgetHasComposition is true when the widget in this process thinks that
|
|
// IME has composition. So, this is set to true when eCompositionStart is
|
|
// dispatched and set to false when eCompositionCommit(AsIs) is dispatched.
|
|
bool mWidgetHasComposition;
|
|
// mIsChildIgnoringCompositionEvents is set to true if the child process
|
|
// requests commit composition whose commit has already been sent to it.
|
|
// Then, set to false when the child process ignores the commit event.
|
|
bool mIsChildIgnoringCompositionEvents;
|
|
|
|
ContentCacheInParent() = delete;
|
|
|
|
/**
|
|
* When following methods' aRoundToExistingOffset is true, even if specified
|
|
* offset or range is out of bounds, the result is computed with the existing
|
|
* cache forcibly.
|
|
*/
|
|
bool GetCaretRect(uint32_t aOffset, bool aRoundToExistingOffset,
|
|
LayoutDeviceIntRect& aCaretRect) const;
|
|
bool GetTextRect(uint32_t aOffset, bool aRoundToExistingOffset,
|
|
LayoutDeviceIntRect& aTextRect) const;
|
|
bool GetUnionTextRects(uint32_t aOffset, uint32_t aLength,
|
|
bool aRoundToExistingOffset,
|
|
LayoutDeviceIntRect& aUnionTextRect) const;
|
|
|
|
void FlushPendingNotifications(nsIWidget* aWidget);
|
|
|
|
#if MOZ_DIAGNOSTIC_ASSERT_ENABLED
|
|
/**
|
|
* Remove unnecessary messages from mDispatchedEventMessages and
|
|
* mReceivedEventMessages.
|
|
*/
|
|
void RemoveUnnecessaryEventMessageLog();
|
|
|
|
/**
|
|
* Append event message log to aLog.
|
|
*/
|
|
void AppendEventMessageLog(nsACString& aLog) const;
|
|
#endif // #if MOZ_DIAGNOSTIC_ASSERT_ENABLED
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_ContentCache_h
|