292 lines
12 KiB
C++
292 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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_ContentEventHandler_h_
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#define mozilla_ContentEventHandler_h_
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#include "mozilla/EventForwards.h"
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#include "mozilla/dom/Selection.h"
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#include "nsCOMPtr.h"
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#include "nsIFrame.h"
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#include "nsINode.h"
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#include "nsRange.h"
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class nsPresContext;
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struct nsRect;
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namespace mozilla {
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enum LineBreakType
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{
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LINE_BREAK_TYPE_NATIVE,
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LINE_BREAK_TYPE_XP
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};
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/*
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* Query Content Event Handler
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* ContentEventHandler is a helper class for EventStateManager.
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* The platforms request some content informations, e.g., the selected text,
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* the offset of the selected text and the text for specified range.
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* This class answers to NS_QUERY_* events from actual contents.
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*/
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class MOZ_STACK_CLASS ContentEventHandler
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{
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public:
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typedef dom::Selection Selection;
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explicit ContentEventHandler(nsPresContext* aPresContext);
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// Handle aEvent in the current process.
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nsresult HandleQueryContentEvent(WidgetQueryContentEvent* aEvent);
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// eQuerySelectedText event handler
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nsresult OnQuerySelectedText(WidgetQueryContentEvent* aEvent);
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// eQueryTextContent event handler
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nsresult OnQueryTextContent(WidgetQueryContentEvent* aEvent);
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// eQueryCaretRect event handler
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nsresult OnQueryCaretRect(WidgetQueryContentEvent* aEvent);
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// eQueryTextRect event handler
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nsresult OnQueryTextRect(WidgetQueryContentEvent* aEvent);
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// eQueryEditorRect event handler
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nsresult OnQueryEditorRect(WidgetQueryContentEvent* aEvent);
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// eQueryContentState event handler
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nsresult OnQueryContentState(WidgetQueryContentEvent* aEvent);
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// eQuerySelectionAsTransferable event handler
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nsresult OnQuerySelectionAsTransferable(WidgetQueryContentEvent* aEvent);
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// eQueryCharacterAtPoint event handler
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nsresult OnQueryCharacterAtPoint(WidgetQueryContentEvent* aEvent);
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// eQueryDOMWidgetHittest event handler
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nsresult OnQueryDOMWidgetHittest(WidgetQueryContentEvent* aEvent);
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// NS_SELECTION_* event
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nsresult OnSelectionEvent(WidgetSelectionEvent* aEvent);
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protected:
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nsPresContext* mPresContext;
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nsCOMPtr<nsIPresShell> mPresShell;
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RefPtr<Selection> mSelection;
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RefPtr<nsRange> mFirstSelectedRange;
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nsCOMPtr<nsIContent> mRootContent;
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nsresult Init(WidgetQueryContentEvent* aEvent);
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nsresult Init(WidgetSelectionEvent* aEvent);
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nsresult InitBasic();
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nsresult InitCommon();
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public:
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// FlatText means the text that is generated from DOM tree. The BR elements
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// are replaced to native linefeeds. Other elements are ignored.
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// NodePosition stores a pair of node and offset in the node.
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// When mNode is an element and mOffset is 0, the start position means after
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// the open tag of mNode.
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// This is useful to receive one or more sets of them instead of nsRange.
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struct NodePosition
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{
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nsCOMPtr<nsINode> mNode;
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int32_t mOffset;
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// Only when mNode is an element node and mOffset is 0, mAfterOpenTag is
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// referred.
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bool mAfterOpenTag;
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NodePosition()
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: mOffset(-1)
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, mAfterOpenTag(true)
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{
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}
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NodePosition(nsINode* aNode, int32_t aOffset)
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: mNode(aNode)
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, mOffset(aOffset)
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, mAfterOpenTag(true)
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{
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}
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explicit NodePosition(const nsIFrame::ContentOffsets& aContentOffsets)
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: mNode(aContentOffsets.content)
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, mOffset(aContentOffsets.offset)
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, mAfterOpenTag(true)
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{
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}
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protected:
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NodePosition(nsINode* aNode, int32_t aOffset, bool aAfterOpenTag)
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: mNode(aNode)
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, mOffset(aOffset)
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, mAfterOpenTag(aAfterOpenTag)
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{
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}
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public:
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bool operator==(const NodePosition& aOther) const
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{
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return mNode == aOther.mNode &&
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mOffset == aOther.mOffset &&
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mAfterOpenTag == aOther.mAfterOpenTag;
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}
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bool IsValid() const
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{
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return mNode && mOffset >= 0;
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}
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bool OffsetIsValid() const
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{
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return IsValid() && static_cast<uint32_t>(mOffset) <= mNode->Length();
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}
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bool IsBeforeOpenTag() const
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{
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return IsValid() && mNode->IsElement() && !mOffset && !mAfterOpenTag;
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}
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bool IsImmediatelyAfterOpenTag() const
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{
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return IsValid() && mNode->IsElement() && !mOffset && mAfterOpenTag;
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}
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nsresult SetToRangeStart(nsRange* aRange) const
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{
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nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(mNode));
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return aRange->SetStart(domNode, mOffset);
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}
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nsresult SetToRangeEnd(nsRange* aRange) const
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{
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nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(mNode));
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return aRange->SetEnd(domNode, mOffset);
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}
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nsresult SetToRangeEndAfter(nsRange* aRange) const
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{
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nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(mNode));
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return aRange->SetEndAfter(domNode);
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}
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};
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// NodePositionBefore isn't good name if mNode isn't an element node nor
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// mOffset is not 0, though, when mNode is an element node and mOffset is 0,
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// this is treated as before the open tag of mNode.
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struct NodePositionBefore final : public NodePosition
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{
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NodePositionBefore(nsINode* aNode, int32_t aOffset)
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: NodePosition(aNode, aOffset, false)
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{
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}
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};
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// Get the flatten text length in the range.
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// @param aStartPosition Start node and offset in the node of the range.
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// @param aEndPosition End node and offset in the node of the range.
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// @param aRootContent The root content of the editor or document.
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// aRootContent won't cause any text including
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// line breaks.
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// @param aLength The result of the flatten text length of the
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// range.
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// @param aLineBreakType Whether this computes flatten text length with
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// native line breakers on the platform or
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// with XP line breaker (\n).
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// @param aIsRemovingNode Should be true only when this is called from
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// nsIMutationObserver::ContentRemoved().
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// When this is true, aStartPosition.mNode should
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// be the root node of removing nodes and mOffset
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// should be 0 and aEndPosition.mNode should be
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// same as aStartPosition.mNode and mOffset should
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// be number of the children of mNode.
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static nsresult GetFlatTextLengthInRange(const NodePosition& aStartPosition,
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const NodePosition& aEndPosition,
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nsIContent* aRootContent,
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uint32_t* aLength,
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LineBreakType aLineBreakType,
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bool aIsRemovingNode = false);
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// Computes the native text length between aStartOffset and aEndOffset of
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// aContent. aContent must be a text node.
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static uint32_t GetNativeTextLength(nsIContent* aContent,
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uint32_t aStartOffset,
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uint32_t aEndOffset);
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// Get the native text length of aContent. aContent must be a text node.
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static uint32_t GetNativeTextLength(nsIContent* aContent,
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uint32_t aMaxLength = UINT32_MAX);
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// Get the native text length which is inserted before aContent.
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// aContent should be an element.
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static uint32_t GetNativeTextLengthBefore(nsIContent* aContent,
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nsINode* aRootNode);
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protected:
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// Get the text length of aContent. aContent must be a text node.
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static uint32_t GetTextLength(nsIContent* aContent,
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LineBreakType aLineBreakType,
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uint32_t aMaxLength = UINT32_MAX);
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// Get the text length of a given range of a content node in
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// the given line break type.
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static uint32_t GetTextLengthInRange(nsIContent* aContent,
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uint32_t aXPStartOffset,
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uint32_t aXPEndOffset,
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LineBreakType aLineBreakType);
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// Get the contents of aRange as plain text.
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nsresult GenerateFlatTextContent(nsRange* aRange,
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nsAFlatString& aString,
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LineBreakType aLineBreakType);
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// Get the text length before the start position of aRange.
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nsresult GetFlatTextLengthBefore(nsRange* aRange,
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uint32_t* aOffset,
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LineBreakType aLineBreakType);
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// Check if we should insert a line break before aContent.
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// This should return false only when aContent is an html element which
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// is typically used in a paragraph like <em>.
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static bool ShouldBreakLineBefore(nsIContent* aContent,
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nsINode* aRootNode);
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// Get the line breaker length.
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static inline uint32_t GetBRLength(LineBreakType aLineBreakType);
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static LineBreakType GetLineBreakType(WidgetQueryContentEvent* aEvent);
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static LineBreakType GetLineBreakType(WidgetSelectionEvent* aEvent);
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static LineBreakType GetLineBreakType(bool aUseNativeLineBreak);
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// Returns focused content (including its descendant documents).
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nsIContent* GetFocusedContent();
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// Returns true if the content is a plugin host.
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bool IsPlugin(nsIContent* aContent);
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// QueryContentRect() sets the rect of aContent's frame(s) to aEvent.
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nsresult QueryContentRect(nsIContent* aContent,
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WidgetQueryContentEvent* aEvent);
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// Make the DOM range from the offset of FlatText and the text length.
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// If aExpandToClusterBoundaries is true, the start offset and the end one are
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// expanded to nearest cluster boundaries.
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nsresult SetRangeFromFlatTextOffset(nsRange* aRange,
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uint32_t aOffset,
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uint32_t aLength,
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LineBreakType aLineBreakType,
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bool aExpandToClusterBoundaries,
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uint32_t* aNewOffset = nullptr);
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// If the aRange isn't in text node but next to a text node, this method
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// modifies it in the text node. Otherwise, not modified.
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nsresult AdjustCollapsedRangeMaybeIntoTextNode(nsRange* aCollapsedRange);
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// Find the first frame for the range and get the start offset in it.
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nsresult GetStartFrameAndOffset(const nsRange* aRange,
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nsIFrame*& aFrame,
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int32_t& aOffsetInFrame);
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// Convert the frame relative offset to the root frame of the root presContext
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// relative offset.
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nsresult ConvertToRootRelativeOffset(nsIFrame* aFrame,
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nsRect& aRect);
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// Expand aXPOffset to the nearest offset in cluster boundary. aForward is
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// true, it is expanded to forward.
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nsresult ExpandToClusterBoundary(nsIContent* aContent, bool aForward,
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uint32_t* aXPOffset);
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typedef nsTArray<mozilla::FontRange> FontRangeArray;
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static void AppendFontRanges(FontRangeArray& aFontRanges,
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nsIContent* aContent,
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int32_t aBaseOffset,
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int32_t aXPStartOffset,
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int32_t aXPEndOffset,
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LineBreakType aLineBreakType);
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nsresult GenerateFlatFontRanges(nsRange* aRange,
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FontRangeArray& aFontRanges,
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uint32_t& aLength,
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LineBreakType aLineBreakType);
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};
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} // namespace mozilla
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#endif // mozilla_ContentEventHandler_h_
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