gecko-dev/editor/libeditor/nsTextEditRules.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 nsTextEditRules_h__
#define nsTextEditRules_h__
#include "nsCOMPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsEditRules.h"
#include "nsEditor.h"
#include "nsIEditor.h"
#include "nsISupportsImpl.h"
#include "nsITimer.h"
#include "nsPlaintextEditor.h"
#include "nsString.h"
#include "nscore.h"
class nsIDOMElement;
class nsIDOMNode;
namespace mozilla {
namespace dom {
class Selection;
} // namespace dom
} // namespace mozilla
/** Object that encapsulates HTML text-specific editing rules.
*
* To be a good citizen, edit rules must live by these restrictions:
* 1. All data manipulation is through the editor.
* Content nodes in the document tree must <B>not</B> be manipulated directly.
* Content nodes in document fragments that are not part of the document itself
* may be manipulated at will. Operations on document fragments must <B>not</B>
* go through the editor.
* 2. Selection must not be explicitly set by the rule method.
* Any manipulation of Selection must be done by the editor.
*/
class nsTextEditRules : public nsIEditRules, public nsITimerCallback
{
public:
NS_DECL_NSITIMERCALLBACK
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsTextEditRules, nsIEditRules)
nsTextEditRules();
// nsIEditRules methods
NS_IMETHOD Init(nsPlaintextEditor *aEditor) override;
NS_IMETHOD SetInitialValue(const nsAString& aValue) override;
NS_IMETHOD DetachEditor() override;
NS_IMETHOD BeforeEdit(EditAction action,
nsIEditor::EDirection aDirection) override;
NS_IMETHOD AfterEdit(EditAction action,
nsIEditor::EDirection aDirection) override;
NS_IMETHOD WillDoAction(mozilla::dom::Selection* aSelection,
nsRulesInfo* aInfo, bool* aCancel, bool* aHandled) override;
NS_IMETHOD DidDoAction(mozilla::dom::Selection* aSelection,
nsRulesInfo* aInfo, nsresult aResult) override;
NS_IMETHOD DocumentIsEmpty(bool *aDocumentIsEmpty) override;
NS_IMETHOD DocumentModified() override;
protected:
virtual ~nsTextEditRules();
public:
void ResetIMETextPWBuf();
/**
* Handles the newline characters either according to aNewLineHandling
* or to the default system prefs if aNewLineHandling is negative.
*
* @param aString the string to be modified in place.
* @param aNewLineHandling determine the desired type of newline handling:
* * negative values:
* handle newlines according to platform defaults.
* * nsIPlaintextEditor::eNewlinesReplaceWithSpaces:
* replace newlines with spaces.
* * nsIPlaintextEditor::eNewlinesStrip:
* remove newlines from the string.
* * nsIPlaintextEditor::eNewlinesReplaceWithCommas:
* replace newlines with commas.
* * nsIPlaintextEditor::eNewlinesStripSurroundingWhitespace:
* collapse newlines and surrounding whitespace characters and
* remove them from the string.
* * nsIPlaintextEditor::eNewlinesPasteIntact:
* only remove the leading and trailing newlines.
* * nsIPlaintextEditor::eNewlinesPasteToFirst or any other value:
* remove the first newline and all characters following it.
*/
static void HandleNewLines(nsString &aString, int32_t aNewLineHandling);
/**
* Prepare a string buffer for being displayed as the contents of a password
* field. This function uses the platform-specific character for representing
* characters entered into password fields.
*
* @param aOutString the output string. When this function returns,
* aOutString will contain aLength password characters.
* @param aLength the number of password characters that aOutString should
* contain.
*/
static void FillBufWithPWChars(nsAString *aOutString, int32_t aLength);
protected:
void InitFields();
// nsTextEditRules implementation methods
nsresult WillInsertText( EditAction aAction,
mozilla::dom::Selection* aSelection,
bool *aCancel,
bool *aHandled,
const nsAString *inString,
nsAString *outString,
int32_t aMaxLength);
nsresult DidInsertText(mozilla::dom::Selection* aSelection,
nsresult aResult);
nsresult GetTopEnclosingPre(nsIDOMNode *aNode, nsIDOMNode** aOutPreNode);
nsresult WillInsertBreak(mozilla::dom::Selection* aSelection, bool* aCancel,
bool *aHandled, int32_t aMaxLength);
nsresult DidInsertBreak(mozilla::dom::Selection* aSelection,
nsresult aResult);
nsresult WillInsert(mozilla::dom::Selection* aSelection, bool* aCancel);
nsresult DidInsert(mozilla::dom::Selection* aSelection, nsresult aResult);
nsresult WillDeleteSelection(mozilla::dom::Selection* aSelection,
nsIEditor::EDirection aCollapsedAction,
bool *aCancel,
bool *aHandled);
nsresult DidDeleteSelection(mozilla::dom::Selection* aSelection,
nsIEditor::EDirection aCollapsedAction,
nsresult aResult);
nsresult WillSetTextProperty(mozilla::dom::Selection* aSelection,
bool* aCancel, bool* aHandled);
nsresult DidSetTextProperty(mozilla::dom::Selection* aSelection,
nsresult aResult);
nsresult WillRemoveTextProperty(mozilla::dom::Selection* aSelection,
bool* aCancel, bool* aHandled);
nsresult DidRemoveTextProperty(mozilla::dom::Selection* aSelection,
nsresult aResult);
nsresult WillUndo(mozilla::dom::Selection* aSelection, bool* aCancel,
bool* aHandled);
nsresult DidUndo(mozilla::dom::Selection* aSelection, nsresult aResult);
nsresult WillRedo(mozilla::dom::Selection* aSelection, bool* aCancel,
bool* aHandled);
nsresult DidRedo(mozilla::dom::Selection* aSelection, nsresult aResult);
/** called prior to nsIEditor::OutputToString
* @param aSelection
* @param aInFormat the format requested for the output, a MIME type
* @param aOutText the string to use for output, if aCancel is set to true
* @param aOutCancel if set to true, the caller should cancel the operation
* and use aOutText as the result.
*/
nsresult WillOutputText(mozilla::dom::Selection* aSelection,
const nsAString *aInFormat,
nsAString *aOutText,
bool *aOutCancel,
bool *aHandled);
nsresult DidOutputText(mozilla::dom::Selection* aSelection, nsresult aResult);
// helper functions
/** check for and replace a redundant trailing break */
nsresult RemoveRedundantTrailingBR();
/** creates a trailing break in the text doc if there is not one already */
nsresult CreateTrailingBRIfNeeded();
/** creates a bogus text node if the document has no editable content */
nsresult CreateBogusNodeIfNeeded(mozilla::dom::Selection* aSelection);
/** returns a truncated insertion string if insertion would place us
over aMaxLength */
nsresult TruncateInsertionIfNeeded(mozilla::dom::Selection* aSelection,
const nsAString *aInString,
nsAString *aOutString,
int32_t aMaxLength,
bool *aTruncated);
/** Remove IME composition text from password buffer */
void RemoveIMETextFromPWBuf(int32_t &aStart, nsAString *aIMEString);
nsresult CreateMozBR(nsIDOMNode* inParent, int32_t inOffset,
nsIDOMNode** outBRNode = nullptr);
void UndefineCaretBidiLevel(mozilla::dom::Selection* aSelection);
nsresult CheckBidiLevelForDeletion(mozilla::dom::Selection* aSelection,
nsIDOMNode *aSelNode,
int32_t aSelOffset,
nsIEditor::EDirection aAction,
bool *aCancel);
nsresult HideLastPWInput();
nsresult CollapseSelectionToTrailingBRIfNeeded(mozilla::dom::Selection* aSelection);
bool IsPasswordEditor() const
{
return mEditor ? mEditor->IsPasswordEditor() : false;
}
bool IsSingleLineEditor() const
{
return mEditor ? mEditor->IsSingleLineEditor() : false;
}
bool IsPlaintextEditor() const
{
return mEditor ? mEditor->IsPlaintextEditor() : false;
}
bool IsReadonly() const
{
return mEditor ? mEditor->IsReadonly() : false;
}
bool IsDisabled() const
{
return mEditor ? mEditor->IsDisabled() : false;
}
bool IsMailEditor() const
{
return mEditor ? mEditor->IsMailEditor() : false;
}
bool DontEchoPassword() const
{
return mEditor ? mEditor->DontEchoPassword() : false;
}
// data members
nsPlaintextEditor *mEditor; // note that we do not refcount the editor
nsString mPasswordText; // a buffer we use to store the real value of password editors
nsString mPasswordIMEText; // a buffer we use to track the IME composition string
uint32_t mPasswordIMEIndex;
nsCOMPtr<nsIDOMNode> mBogusNode; // magic node acts as placeholder in empty doc
nsCOMPtr<nsIDOMNode> mCachedSelectionNode; // cached selected node
int32_t mCachedSelectionOffset; // cached selected offset
uint32_t mActionNesting;
bool mLockRulesSniffing;
bool mDidExplicitlySetInterline;
bool mDeleteBidiImmediately; // in bidirectional text, delete
// characters not visually
// adjacent to the caret without
// moving the caret first.
EditAction mTheAction; // the top level editor action
nsCOMPtr<nsITimer> mTimer;
uint32_t mLastStart, mLastLength;
// friends
friend class nsAutoLockRulesSniffing;
};
class nsTextRulesInfo : public nsRulesInfo
{
public:
explicit nsTextRulesInfo(EditAction aAction) :
nsRulesInfo(aAction),
inString(0),
outString(0),
outputFormat(0),
maxLength(-1),
collapsedAction(nsIEditor::eNext),
stripWrappers(nsIEditor::eStrip),
bOrdered(false),
entireList(false),
bulletType(0),
alignType(0),
blockType(0),
insertElement(0)
{}
virtual ~nsTextRulesInfo() {}
// kInsertText
const nsAString *inString;
nsAString *outString;
const nsAString *outputFormat;
int32_t maxLength;
// kDeleteSelection
nsIEditor::EDirection collapsedAction;
nsIEditor::EStripWrappers stripWrappers;
// kMakeList
bool bOrdered;
bool entireList;
const nsAString *bulletType;
// kAlign
const nsAString *alignType;
// kMakeBasicBlock
const nsAString *blockType;
// kInsertElement
const nsIDOMElement* insertElement;
};
/***************************************************************************
* stack based helper class for StartOperation()/EndOperation() sandwich.
* this class sets a bool letting us know to ignore any rules sniffing
* that tries to occur reentrantly.
*/
class nsAutoLockRulesSniffing
{
public:
explicit nsAutoLockRulesSniffing(nsTextEditRules *rules) : mRules(rules)
{if (mRules) mRules->mLockRulesSniffing = true;}
~nsAutoLockRulesSniffing()
{if (mRules) mRules->mLockRulesSniffing = false;}
protected:
nsTextEditRules *mRules;
};
/***************************************************************************
* stack based helper class for turning on/off the edit listener.
*/
class nsAutoLockListener
{
public:
explicit nsAutoLockListener(bool *enabled) : mEnabled(enabled)
{if (mEnabled) { mOldState=*mEnabled; *mEnabled = false;}}
~nsAutoLockListener()
{if (mEnabled) *mEnabled = mOldState;}
protected:
bool *mEnabled;
bool mOldState;
};
#endif //nsTextEditRules_h__