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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
#ifndef mozilla_PendingStyles_h
#define mozilla_PendingStyles_h
#include "mozilla/EditorDOMPoint.h"
#include "mozilla/EditorForwards.h"
#include "mozilla/EventForwards.h"
#include "mozilla/Maybe.h"
#include "mozilla/UniquePtr.h"
#include "nsAtom.h"
#include "nsCOMPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsGkAtoms.h"
#include "nsISupportsImpl.h"
#include "nsString.h"
#include "nsTArray.h"
#include "nscore.h"
class nsINode;
namespace mozilla {
namespace dom {
class MouseEvent;
class Selection;
} // namespace dom
enum class SpecifiedStyle : uint8_t { Preserve, Discard };
class PendingStyle final {
public:
PendingStyle() = delete;
PendingStyle(nsStaticAtom* aTag, nsAtom* aAttribute, const nsAString& aValue,
SpecifiedStyle aSpecifiedStyle = SpecifiedStyle::Preserve)
: mTag(aTag),
mAttribute(aAttribute != nsGkAtoms::_empty ? aAttribute : nullptr),
mAttributeValueOrCSSValue(aValue),
mSpecifiedStyle(aSpecifiedStyle) {
MOZ_COUNT_CTOR(PendingStyle);
}
MOZ_COUNTED_DTOR(PendingStyle)
MOZ_KNOWN_LIVE nsStaticAtom* GetTag() const { return mTag; }
MOZ_KNOWN_LIVE nsAtom* GetAttribute() const { return mAttribute; }
const nsString& AttributeValueOrCSSValueRef() const {
return mAttributeValueOrCSSValue;
}
void UpdateAttributeValueOrCSSValue(const nsAString& aNewValue) {
mAttributeValueOrCSSValue = aNewValue;
}
SpecifiedStyle GetSpecifiedStyle() const { return mSpecifiedStyle; }
EditorInlineStyle ToInlineStyle() const;
EditorInlineStyleAndValue ToInlineStyleAndValue() const;
private:
MOZ_KNOWN_LIVE nsStaticAtom* const mTag = nullptr;
// TODO: Once we stop using `HTMLEditor::SetInlinePropertiesAsSubAction` to
// add any attributes of <a href>, we can make this `nsStaticAtom*`.
MOZ_KNOWN_LIVE const RefPtr<nsAtom> mAttribute;
// If the editor is in CSS mode, this value is the property value.
// If the editor is in HTML mode, this value is not empty only when
// - mAttribute is not nullptr
// - mTag is CSS invertible style and "-moz-editor-invert-value"
nsString mAttributeValueOrCSSValue;
// Whether the class and style attribute should be preserved or discarded.
const SpecifiedStyle mSpecifiedStyle = SpecifiedStyle::Preserve;
};
class PendingStyleCache final {
public:
PendingStyleCache() = delete;
PendingStyleCache(const nsStaticAtom& aTag, const nsStaticAtom* aAttribute,
const nsAString& aValue)
// Needs const_cast hack here because the this class users may want
: mTag(const_cast<nsStaticAtom&>(aTag)),
mAttribute(const_cast<nsStaticAtom*>(aAttribute)),
mAttributeValueOrCSSValue(aValue) {}
PendingStyleCache(const nsStaticAtom& aTag, const nsStaticAtom* aAttribute,
nsAString&& aValue)
// Needs const_cast hack here because the this class users may want
: mTag(const_cast<nsStaticAtom&>(aTag)),
mAttribute(const_cast<nsStaticAtom*>(aAttribute)),
mAttributeValueOrCSSValue(std::move(aValue)) {}
MOZ_KNOWN_LIVE nsStaticAtom& TagRef() const { return mTag; }
MOZ_KNOWN_LIVE nsStaticAtom* GetAttribute() const { return mAttribute; }
const nsString& AttributeValueOrCSSValueRef() const {
return mAttributeValueOrCSSValue;
}
EditorInlineStyle ToInlineStyle() const;
private:
MOZ_KNOWN_LIVE nsStaticAtom& mTag;
MOZ_KNOWN_LIVE nsStaticAtom* const mAttribute;
const nsString mAttributeValueOrCSSValue;
};
class MOZ_STACK_CLASS AutoPendingStyleCacheArray final
: public AutoTArray<PendingStyleCache, 21> {
public:
[[nodiscard]] index_type IndexOf(const nsStaticAtom& aTag,
const nsStaticAtom* aAttribute) const {
for (index_type index = 0; index < Length(); ++index) {
const PendingStyleCache& styleCache = ElementAt(index);
if (&styleCache.TagRef() == &aTag &&
styleCache.GetAttribute() == aAttribute) {
return index;
}
}
return NoIndex;
}
[[nodiscard]] bool Contains(const nsStaticAtom& aTag,
const nsStaticAtom* aAttribute) const {
return IndexOf(aTag, aAttribute) != NoIndex;
}
};
enum class PendingStyleState {
// Will be not changed in new content
NotUpdated,
// Will be applied to new content
BeingPreserved,
// Will be cleared from new content
BeingCleared,
};
/******************************************************************************
* PendingStyles stores pending inline styles which WILL be applied to new
* content when it'll be inserted. I.e., updating styles of this class means
* that it does NOT update the DOM tree immediately.
******************************************************************************/
class PendingStyles final {
public:
NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(PendingStyles)
NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(PendingStyles)
PendingStyles() = default;
void Reset() {
mClearingStyles.Clear();
mPreservingStyles.Clear();
}
nsresult UpdateSelState(const HTMLEditor& aHTMLEditor);
/**
* PreHandleMouseEvent() is called when `HTMLEditorEventListener` receives
* "mousedown" and "mouseup" events. Note that `aMouseDownOrUpEvent` may not
* be acceptable event for the `HTMLEditor`, but this is called even in
* the case because the event may cause a following `OnSelectionChange()`
* call.
*/
void PreHandleMouseEvent(const dom::MouseEvent& aMouseDownOrUpEvent);
void PreHandleSelectionChangeCommand(Command aCommand);
void PostHandleSelectionChangeCommand(const HTMLEditor& aHTMLEditor,
Command aCommand);
void OnSelectionChange(const HTMLEditor& aHTMLEditor, int16_t aReason);
/**
* Preserve the style for next inserting content. E.g., when user types next
* character, an inline element which provides the style will be inserted
* and the typing character will appear in it.
*
* @param aHTMLProperty The HTML tag name which represents the style.
* For example, nsGkAtoms::b for bold text.
* @param aAttribute nullptr or attribute name which represents the
* style with aHTMLProperty. E.g., nsGkAtoms::size
* for nsGkAtoms::font.
* @param aAttributeValueOrCSSValue
* New value of aAttribute or new CSS value if the
* editor is in the CSS mode.
*/
void PreserveStyle(nsStaticAtom& aHTMLProperty, nsAtom* aAttribute,
const nsAString& aAttributeValueOrCSSValue);
/**
* Preserve the styles with new values in aStylesToPreserve.
* See above for the detail.
*/
void PreserveStyles(
const nsTArray<EditorInlineStyleAndValue>& aStylesToPreserve);
/**
* Preserve the style with new value specified with aStyleToPreserve.
* See above for the detail.
*/
void PreserveStyle(const PendingStyleCache& aStyleToPreserve) {
PreserveStyle(aStyleToPreserve.TagRef(), aStyleToPreserve.GetAttribute(),
aStyleToPreserve.AttributeValueOrCSSValueRef());
}
/**
* Clear the style when next content is inserted. E.g., when user types next
* character, it'll will be inserted after parent element which provides the
* style and clones element which represents other styles in the parent
* element.
*
* @param aHTMLProperty The HTML tag name which represents the style.
* For example, nsGkAtoms::b for bold text.
* @param aAttribute nullptr or attribute name which represents the
* style with aHTMLProperty. E.g., nsGkAtoms::size
* for nsGkAtoms::font.
*/
void ClearStyle(nsStaticAtom& aHTMLProperty, nsAtom* aAttribute) {
ClearStyleInternal(&aHTMLProperty, aAttribute);
}
/**
* Clear all styles specified by aStylesToClear when next content is inserted.
* See above for the detail.
*/
void ClearStyles(const nsTArray<EditorInlineStyle>& aStylesToClear);
/**
* Clear all styles when next inserting content. E.g., when user types next
* character, it will be inserted outside any inline parents which provides
* current text style.
*/
void ClearAllStyles() {
// XXX Why don't we clear mClearingStyles first?
ClearStyleInternal(nullptr, nullptr);
}
/**
* Clear <a> element and discard styles which is applied by it.
*/
void ClearLinkAndItsSpecifiedStyle() {
ClearStyleInternal(nsGkAtoms::a, nullptr, SpecifiedStyle::Discard);
}
/**
* TakeClearingStyle() hands back next property item on the clearing styles.
* This must be used only for handling to clear the styles from inserting
* content.
*/
UniquePtr<PendingStyle> TakeClearingStyle() {
if (mClearingStyles.IsEmpty()) {
return nullptr;
}
return mClearingStyles.PopLastElement();
}
/**
* TakeAllPreservedStyles() moves all preserved styles and values to
* aOutStylesAndValues.
*/
void TakeAllPreservedStyles(
nsTArray<EditorInlineStyleAndValue>& aOutStylesAndValues);
/**
* TakeRelativeFontSize() hands back relative font value, which is then
* cleared out.
*/
int32_t TakeRelativeFontSize();
/**
* GetStyleState() returns whether the style will be applied to new content,
* removed from new content or not changed.
*
* @param aHTMLProperty The HTML tag name which represents the style.
* For example, nsGkAtoms::b for bold text.
* @param aAttribute nullptr or attribute name which represents the
* style with aHTMLProperty. E.g., nsGkAtoms::size
* for nsGkAtoms::font.
* @param aOutNewAttributeValueOrCSSValue
* [out, optional] If applied to new content, this
* is set to the new value.
*/
PendingStyleState GetStyleState(
nsStaticAtom& aHTMLProperty, nsAtom* aAttribute = nullptr,
nsString* aOutNewAttributeValueOrCSSValue = nullptr) const;
protected:
virtual ~PendingStyles() { Reset(); };
void ClearStyleInternal(
nsStaticAtom* aHTMLProperty, nsAtom* aAttribute,
SpecifiedStyle aSpecifiedStyle = SpecifiedStyle::Preserve);
void CancelPreservingStyle(nsStaticAtom* aHTMLProperty, nsAtom* aAttribute);
void CancelClearingStyle(nsStaticAtom& aHTMLProperty, nsAtom* aAttribute);
Maybe<size_t> IndexOfPreservingStyle(nsStaticAtom& aHTMLProperty,
nsAtom* aAttribute,
nsAString* aOutValue = nullptr) const {
return IndexOfStyleInArray(&aHTMLProperty, aAttribute, aOutValue,
mPreservingStyles);
}
Maybe<size_t> IndexOfClearingStyle(nsStaticAtom* aHTMLProperty,
nsAtom* aAttribute) const {
return IndexOfStyleInArray(aHTMLProperty, aAttribute, nullptr,
mClearingStyles);
}
bool IsLinkStyleSet() const {
return IndexOfPreservingStyle(*nsGkAtoms::a, nullptr).isSome();
}
bool IsExplicitlyLinkStyleCleared() const {
return IndexOfClearingStyle(nsGkAtoms::a, nullptr).isSome();
}
bool IsOnlyLinkStyleCleared() const {
return mClearingStyles.Length() == 1 && IsExplicitlyLinkStyleCleared();
}
bool IsStyleCleared(nsStaticAtom* aHTMLProperty, nsAtom* aAttribute) const {
return IndexOfClearingStyle(aHTMLProperty, aAttribute).isSome() ||
AreAllStylesCleared();
}
bool AreAllStylesCleared() const {
return IndexOfClearingStyle(nullptr, nullptr).isSome();
}
bool AreSomeStylesSet() const { return !mPreservingStyles.IsEmpty(); }
bool AreSomeStylesCleared() const { return !mClearingStyles.IsEmpty(); }
static Maybe<size_t> IndexOfStyleInArray(
nsStaticAtom* aHTMLProperty, nsAtom* aAttribute, nsAString* aOutValue,
const nsTArray<UniquePtr<PendingStyle>>& aArray);
nsTArray<UniquePtr<PendingStyle>> mPreservingStyles;
nsTArray<UniquePtr<PendingStyle>> mClearingStyles;
EditorDOMPoint mLastSelectionPoint;
int32_t mRelativeFontSize = 0;
Command mLastSelectionCommand = Command::DoNothing;
bool mMouseDownFiredInLinkElement = false;
bool mMouseUpFiredInLinkElement = false;
};
} // namespace mozilla
#endif // #ifndef mozilla_PendingStyles_h