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Diffstat (limited to 'widget/ContentCache.h')
| -rw-r--r-- | widget/ContentCache.h | 555 |
1 files changed, 555 insertions, 0 deletions
diff --git a/widget/ContentCache.h b/widget/ContentCache.h new file mode 100644 index 0000000000..25eaf643ae --- /dev/null +++ b/widget/ContentCache.h @@ -0,0 +1,555 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: sw=2 ts=8 et : + */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_ContentCache_h +#define mozilla_ContentCache_h + +#include <stdint.h> + +#include "mozilla/widget/IMEData.h" +#include "mozilla/Assertions.h" +#include "mozilla/CheckedInt.h" +#include "mozilla/EventForwards.h" +#include "mozilla/Maybe.h" +#include "mozilla/ToString.h" +#include "mozilla/WritingModes.h" +#include "nsString.h" +#include "nsTArray.h" +#include "Units.h" + +class nsIWidget; + +namespace mozilla { + +class ContentCacheInParent; + +namespace dom { +class BrowserParent; +} // namespace dom + +/** + * ContentCache stores various information of the child content. + * This class has members which are necessary both in parent process and + * content process. + */ + +class ContentCache { + public: + typedef CopyableTArray<LayoutDeviceIntRect> RectArray; + typedef widget::IMENotification IMENotification; + + ContentCache() = default; + + protected: + // Whole text in the target + Maybe<nsString> mText; + + // Start offset of the composition string. + Maybe<uint32_t> mCompositionStart; + + enum { ePrevCharRect = 1, eNextCharRect = 0 }; + + struct Selection final { + // Following values are offset in "flat text". + uint32_t mAnchor; + uint32_t mFocus; + + WritingMode mWritingMode; + + bool mHasRange; + + // Character rects at previous and next character of mAnchor and mFocus. + // The reason why ContentCache needs to store each previous character of + // them is IME may query character rect of the last character of a line + // when caret is at the end of the line. + // Note that use ePrevCharRect and eNextCharRect for accessing each item. + LayoutDeviceIntRect mAnchorCharRects[2]; + LayoutDeviceIntRect mFocusCharRects[2]; + + // Whole rect of selected text. This is empty if the selection is collapsed. + LayoutDeviceIntRect mRect; + + Selection() : mAnchor(UINT32_MAX), mFocus(UINT32_MAX), mHasRange(false) { + ClearRects(); + }; + + explicit Selection( + const IMENotification::SelectionChangeDataBase& aSelectionChangeData) + : mAnchor(UINT32_MAX), + mFocus(UINT32_MAX), + mWritingMode(aSelectionChangeData.GetWritingMode()), + mHasRange(aSelectionChangeData.HasRange()) { + if (mHasRange) { + mAnchor = aSelectionChangeData.AnchorOffset(); + mFocus = aSelectionChangeData.FocusOffset(); + } + } + + explicit Selection(const WidgetQueryContentEvent& aQuerySelectedTextEvent); + + void ClearRects() { + for (auto& rect : mAnchorCharRects) { + rect.SetEmpty(); + } + for (auto& rect : mFocusCharRects) { + rect.SetEmpty(); + } + mRect.SetEmpty(); + } + bool HasRects() const { + for (auto& rect : mAnchorCharRects) { + if (!rect.IsEmpty()) { + return true; + } + } + for (auto& rect : mFocusCharRects) { + if (!rect.IsEmpty()) { + return true; + } + } + return !mRect.IsEmpty(); + } + + bool IsCollapsed() const { return !mHasRange || mFocus == mAnchor; } + bool Reversed() const { + MOZ_ASSERT(mHasRange); + return mFocus < mAnchor; + } + uint32_t StartOffset() const { + MOZ_ASSERT(mHasRange); + return Reversed() ? mFocus : mAnchor; + } + uint32_t EndOffset() const { + MOZ_ASSERT(mHasRange); + return Reversed() ? mAnchor : mFocus; + } + uint32_t Length() const { + MOZ_ASSERT(mHasRange); + return Reversed() ? mAnchor - mFocus : mFocus - mAnchor; + } + LayoutDeviceIntRect StartCharRect() const { + return Reversed() ? mFocusCharRects[eNextCharRect] + : mAnchorCharRects[eNextCharRect]; + } + LayoutDeviceIntRect EndCharRect() const { + return Reversed() ? mAnchorCharRects[eNextCharRect] + : mFocusCharRects[eNextCharRect]; + } + + friend std::ostream& operator<<(std::ostream& aStream, + const Selection& aSelection) { + aStream << "{ "; + if (!aSelection.mHasRange) { + aStream << "HasRange()=false"; + } else { + aStream << "mAnchor=" << aSelection.mAnchor + << ", mFocus=" << aSelection.mFocus << ", mWritingMode=" + << ToString(aSelection.mWritingMode).c_str(); + } + if (aSelection.HasRects()) { + if (aSelection.mAnchor > 0) { + aStream << ", mAnchorCharRects[ePrevCharRect]=" + << aSelection.mAnchorCharRects[ContentCache::ePrevCharRect]; + } + aStream << ", mAnchorCharRects[eNextCharRect]=" + << aSelection.mAnchorCharRects[ContentCache::eNextCharRect]; + if (aSelection.mFocus > 0) { + aStream << ", mFocusCharRects[ePrevCharRect]=" + << aSelection.mFocusCharRects[ContentCache::ePrevCharRect]; + } + aStream << ", mFocusCharRects[eNextCharRect]=" + << aSelection.mFocusCharRects[ContentCache::eNextCharRect] + << ", mRect=" << aSelection.mRect; + } + if (aSelection.mHasRange) { + aStream << ", Reversed()=" << (aSelection.Reversed() ? "true" : "false") + << ", StartOffset()=" << aSelection.StartOffset() + << ", EndOffset()=" << aSelection.EndOffset() + << ", IsCollapsed()=" + << (aSelection.IsCollapsed() ? "true" : "false") + << ", Length()=" << aSelection.Length(); + } + aStream << " }"; + return aStream; + } + }; + Maybe<Selection> mSelection; + + // Stores first char rect because Yosemite's Japanese IME sometimes tries + // to query it. If there is no text, this is caret rect. + LayoutDeviceIntRect mFirstCharRect; + + struct Caret final { + uint32_t mOffset; + LayoutDeviceIntRect mRect; + + explicit Caret(uint32_t aOffset, LayoutDeviceIntRect aCaretRect) + : mOffset(aOffset), mRect(aCaretRect) {} + + uint32_t Offset() const { return mOffset; } + bool HasRect() const { return !mRect.IsEmpty(); } + + friend std::ostream& operator<<(std::ostream& aStream, + const Caret& aCaret) { + aStream << "{ mOffset=" << aCaret.mOffset; + if (aCaret.HasRect()) { + aStream << ", mRect=" << aCaret.mRect; + } + return aStream << " }"; + } + + private: + Caret() = default; + + friend struct IPC::ParamTraits<ContentCache::Caret>; + friend struct IPC::ParamTraits<Maybe<ContentCache::Caret>>; + }; + Maybe<Caret> mCaret; + + struct TextRectArray final { + uint32_t mStart; + RectArray mRects; + + explicit TextRectArray(uint32_t aStartOffset) : mStart(aStartOffset) {} + + bool HasRects() const { return Length() > 0; } + uint32_t StartOffset() const { return mStart; } + uint32_t EndOffset() const { + CheckedInt<uint32_t> endOffset = + CheckedInt<uint32_t>(mStart) + mRects.Length(); + return endOffset.isValid() ? endOffset.value() : UINT32_MAX; + } + uint32_t Length() const { return EndOffset() - mStart; } + bool IsOffsetInRange(uint32_t aOffset) const { + return StartOffset() <= aOffset && aOffset < EndOffset(); + } + bool IsRangeCompletelyInRange(uint32_t aOffset, uint32_t aLength) const { + CheckedInt<uint32_t> endOffset = CheckedInt<uint32_t>(aOffset) + aLength; + if (NS_WARN_IF(!endOffset.isValid())) { + return false; + } + return IsOffsetInRange(aOffset) && aOffset + aLength <= EndOffset(); + } + bool IsOverlappingWith(uint32_t aOffset, uint32_t aLength) const { + if (!HasRects() || aOffset == UINT32_MAX || !aLength) { + return false; + } + CheckedInt<uint32_t> endOffset = CheckedInt<uint32_t>(aOffset) + aLength; + if (NS_WARN_IF(!endOffset.isValid())) { + return false; + } + return aOffset < EndOffset() && endOffset.value() > mStart; + } + LayoutDeviceIntRect GetRect(uint32_t aOffset) const; + LayoutDeviceIntRect GetUnionRect(uint32_t aOffset, uint32_t aLength) const; + LayoutDeviceIntRect GetUnionRectAsFarAsPossible( + uint32_t aOffset, uint32_t aLength, bool aRoundToExistingOffset) const; + + friend std::ostream& operator<<(std::ostream& aStream, + const TextRectArray& aTextRectArray) { + aStream << "{ mStart=" << aTextRectArray.mStart + << ", mRects={ Length()=" << aTextRectArray.Length(); + if (aTextRectArray.HasRects()) { + aStream << ", Elements()=[ "; + static constexpr uint32_t kMaxPrintRects = 4; + const uint32_t kFirstHalf = aTextRectArray.Length() <= kMaxPrintRects + ? UINT32_MAX + : (kMaxPrintRects + 1) / 2; + const uint32_t kSecondHalf = + aTextRectArray.Length() <= kMaxPrintRects ? 0 : kMaxPrintRects / 2; + for (uint32_t i = 0; i < aTextRectArray.Length(); i++) { + if (i > 0) { + aStream << ", "; + } + aStream << ToString(aTextRectArray.mRects[i]).c_str(); + if (i + 1 == kFirstHalf) { + aStream << " ..."; + i = aTextRectArray.Length() - kSecondHalf - 1; + } + } + } + return aStream << " ] } }"; + } + + private: + TextRectArray() = default; + + friend struct IPC::ParamTraits<ContentCache::TextRectArray>; + friend struct IPC::ParamTraits<Maybe<ContentCache::TextRectArray>>; + }; + Maybe<TextRectArray> mTextRectArray; + Maybe<TextRectArray> mLastCommitStringTextRectArray; + + LayoutDeviceIntRect mEditorRect; + + friend class ContentCacheInParent; + friend struct IPC::ParamTraits<ContentCache>; + friend struct IPC::ParamTraits<ContentCache::Selection>; + friend struct IPC::ParamTraits<ContentCache::Caret>; + friend struct IPC::ParamTraits<ContentCache::TextRectArray>; + friend std::ostream& operator<<( + std::ostream& aStream, + const Selection& aSelection); // For e(Prev|Next)CharRect +}; + +class ContentCacheInChild final : public ContentCache { + public: + ContentCacheInChild() = default; + + /** + * Called when composition event will be dispatched in this process from + * PuppetWidget. + */ + void OnCompositionEvent(const WidgetCompositionEvent& aCompositionEvent); + + /** + * When IME loses focus, this should be called and making this forget the + * content for reducing footprint. + */ + void Clear(); + + /** + * Cache*() retrieves the latest content information and store them. + * Be aware, CacheSelection() calls CacheTextRects(), and also CacheText() + * calls CacheSelection(). So, related data is also retrieved automatically. + */ + bool CacheEditorRect(nsIWidget* aWidget, + const IMENotification* aNotification = nullptr); + bool CacheSelection(nsIWidget* aWidget, + const IMENotification* aNotification = nullptr); + bool CacheText(nsIWidget* aWidget, + const IMENotification* aNotification = nullptr); + + bool CacheAll(nsIWidget* aWidget, + const IMENotification* aNotification = nullptr); + + /** + * SetSelection() modifies selection with specified raw data. And also this + * tries to retrieve text rects too. + */ + void SetSelection( + nsIWidget* aWidget, + const IMENotification::SelectionChangeDataBase& aSelectionChangeData); + + private: + bool QueryCharRect(nsIWidget* aWidget, uint32_t aOffset, + LayoutDeviceIntRect& aCharRect) const; + bool QueryCharRectArray(nsIWidget* aWidget, uint32_t aOffset, + uint32_t aLength, RectArray& aCharRectArray) const; + bool CacheCaret(nsIWidget* aWidget, + const IMENotification* aNotification = nullptr); + bool CacheTextRects(nsIWidget* aWidget, + const IMENotification* aNotification = nullptr); + + // Once composition is committed, all of the commit string may be composed + // again by Kakutei-Undo of Japanese IME. Therefore, we need to keep + // storing the last composition start to cache all character rects of the + // last commit string. + Maybe<OffsetAndData<uint32_t>> mLastCommit; +}; + +class ContentCacheInParent final : public ContentCache { + public: + explicit ContentCacheInParent(dom::BrowserParent& aBrowserParent); + + /** + * AssignContent() is called when BrowserParent receives ContentCache from + * the content process. This doesn't copy composition information because + * it's managed by BrowserParent itself. + */ + void AssignContent(const ContentCache& aOther, nsIWidget* aWidget, + const IMENotification* aNotification = nullptr); + + /** + * HandleQueryContentEvent() sets content data to aEvent.mReply. + * + * For eQuerySelectedText, fail if the cache doesn't contain the whole + * selected range. (This shouldn't happen because PuppetWidget should have + * already sent the whole selection.) + * + * For eQueryTextContent, fail only if the cache doesn't overlap with + * the queried range. Note the difference from above. We use + * this behavior because a normal eQueryTextContent event is allowed to + * have out-of-bounds offsets, so that widget can request content without + * knowing the exact length of text. It's up to widget to handle cases when + * the returned offset/length are different from the queried offset/length. + * + * For eQueryTextRect, fail if cached offset/length aren't equals to input. + * Cocoa widget always queries selected offset, so it works on it. + * + * For eQueryCaretRect, fail if cached offset isn't equals to input + * + * For eQueryEditorRect, always success + */ + bool HandleQueryContentEvent(WidgetQueryContentEvent& aEvent, + nsIWidget* aWidget) const; + + /** + * OnCompositionEvent() should be called before sending composition string. + * This returns true if the event should be sent. Otherwise, false. + */ + bool OnCompositionEvent(const WidgetCompositionEvent& aCompositionEvent); + + /** + * OnSelectionEvent() should be called before sending selection event. + */ + void OnSelectionEvent(const WidgetSelectionEvent& aSelectionEvent); + + /** + * OnEventNeedingAckHandled() should be called after the child process + * handles a sent event which needs acknowledging. + * + * WARNING: This may send notifications to IME. That might cause destroying + * BrowserParent or aWidget. Therefore, the caller must not destroy + * this instance during a call of this method. + */ + void OnEventNeedingAckHandled(nsIWidget* aWidget, EventMessage aMessage); + + /** + * RequestIMEToCommitComposition() requests aWidget to commit or cancel + * composition. If it's handled synchronously, this returns true. + * + * @param aWidget The widget to be requested to commit or cancel + * the composition. + * @param aCancel When the caller tries to cancel the composition, true. + * Otherwise, i.e., tries to commit the composition, false. + * @param aCommittedString The committed string (i.e., the last data of + * dispatched composition events during requesting + * IME to commit composition. + * @return Whether the composition is actually committed + * synchronously. + */ + bool RequestIMEToCommitComposition(nsIWidget* aWidget, bool aCancel, + nsAString& aCommittedString); + + /** + * MaybeNotifyIME() may notify IME of the notification. If child process + * hasn't been handled all sending events yet, this stores the notification + * and flush it later. + */ + void MaybeNotifyIME(nsIWidget* aWidget, const IMENotification& aNotification); + + private: + IMENotification mPendingSelectionChange; + IMENotification mPendingTextChange; + IMENotification mPendingLayoutChange; + IMENotification mPendingCompositionUpdate; + +#if MOZ_DIAGNOSTIC_ASSERT_ENABLED + // Log of event messages to be output to crash report. + nsTArray<EventMessage> mDispatchedEventMessages; + nsTArray<EventMessage> mReceivedEventMessages; + // Log of RequestIMEToCommitComposition() in the last 2 compositions. + enum class RequestIMEToCommitCompositionResult : uint8_t { + eToOldCompositionReceived, + eToCommittedCompositionReceived, + eReceivedAfterBrowserParentBlur, + eReceivedButNoTextComposition, + eHandledAsynchronously, + eHandledSynchronously, + }; + const char* ToReadableText( + RequestIMEToCommitCompositionResult aResult) const { + switch (aResult) { + case RequestIMEToCommitCompositionResult::eToOldCompositionReceived: + return "Commit request is not handled because it's for " + "older composition"; + case RequestIMEToCommitCompositionResult::eToCommittedCompositionReceived: + return "Commit request is not handled because BrowserParent has " + "already " + "sent commit event for the composition"; + case RequestIMEToCommitCompositionResult::eReceivedAfterBrowserParentBlur: + return "Commit request is handled with stored composition string " + "because BrowserParent has already lost focus"; + case RequestIMEToCommitCompositionResult::eReceivedButNoTextComposition: + return "Commit request is not handled because there is no " + "TextCompsition instance"; + case RequestIMEToCommitCompositionResult::eHandledAsynchronously: + return "Commit request is handled but IME doesn't commit current " + "composition synchronously"; + case RequestIMEToCommitCompositionResult::eHandledSynchronously: + return "Commit reqeust is handled synchronously"; + default: + return "Unknown reason"; + } + } + nsTArray<RequestIMEToCommitCompositionResult> + mRequestIMEToCommitCompositionResults; +#endif // MOZ_DIAGNOSTIC_ASSERT_ENABLED + + // mBrowserParent is owner of the instance. + dom::BrowserParent& MOZ_NON_OWNING_REF mBrowserParent; + // mCompositionString is composition string which were sent to the remote + // process but not yet committed in the remote process. + nsString mCompositionString; + // 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 |