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Diffstat (limited to 'editor/libeditor/CSSEditUtils.h')
| -rw-r--r-- | editor/libeditor/CSSEditUtils.h | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/editor/libeditor/CSSEditUtils.h b/editor/libeditor/CSSEditUtils.h new file mode 100644 index 0000000000..975c8b8409 --- /dev/null +++ b/editor/libeditor/CSSEditUtils.h @@ -0,0 +1,397 @@ +/* -*- 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 CSSEditUtils_h +#define CSSEditUtils_h + +#include "ChangeStyleTransaction.h" // for ChangeStyleTransaction +#include "EditorForwards.h" +#include "nsCOMPtr.h" // for already_AddRefed +#include "nsStringFwd.h" +#include "nsTArray.h" // for nsTArray +#include "nscore.h" // for nsAString, nsresult, nullptr + +class nsComputedDOMStyle; +class nsAtom; +class nsIContent; +class nsICSSDeclaration; +class nsINode; +class nsStaticAtom; +class nsStyledElement; + +namespace mozilla { +namespace dom { +class Element; +} // namespace dom + +typedef void (*nsProcessValueFunc)(const nsAString* aInputString, + nsAString& aOutputString, + const char* aDefaultValueString, + const char* aPrependString, + const char* aAppendString); + +class CSSEditUtils final { + // To prevent the class being instantiated + CSSEditUtils() = delete; + + public: + enum nsCSSEditableProperty { + eCSSEditableProperty_NONE = 0, + eCSSEditableProperty_background_color, + eCSSEditableProperty_background_image, + eCSSEditableProperty_border, + eCSSEditableProperty_caption_side, + eCSSEditableProperty_color, + eCSSEditableProperty_float, + eCSSEditableProperty_font_family, + eCSSEditableProperty_font_size, + eCSSEditableProperty_font_style, + eCSSEditableProperty_font_weight, + eCSSEditableProperty_height, + eCSSEditableProperty_list_style_type, + eCSSEditableProperty_margin_left, + eCSSEditableProperty_margin_right, + eCSSEditableProperty_text_align, + eCSSEditableProperty_text_decoration, + eCSSEditableProperty_vertical_align, + eCSSEditableProperty_whitespace, + eCSSEditableProperty_width + }; + + // Nb: keep these fields in an order that minimizes padding. + struct CSSEquivTable { + nsCSSEditableProperty cssProperty; + bool gettable; + bool caseSensitiveValue; + nsProcessValueFunc processValueFunctor; + const char* defaultValue; + const char* prependValue; + const char* appendValue; + }; + + /** + * Adds/remove a CSS declaration to the STYLE attribute carried by a given + * element. + * + * @param aHTMLEditor [IN] An HTMLEditor instance + * @param aStyledElement [IN] A DOM styled element. + * @param aProperty [IN] An atom containing the CSS property to set. + * @param aValue [IN] A string containing the value of the CSS + * property. + */ + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static nsresult + SetCSSPropertyWithTransaction(HTMLEditor& aHTMLEditor, + nsStyledElement& aStyledElement, + nsAtom& aProperty, const nsAString& aValue) { + return SetCSSPropertyInternal(aHTMLEditor, aStyledElement, aProperty, + aValue, false); + } + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static nsresult + SetCSSPropertyPixelsWithTransaction(HTMLEditor& aHTMLEditor, + nsStyledElement& aStyledElement, + nsAtom& aProperty, int32_t aIntValue); + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static nsresult + SetCSSPropertyPixelsWithoutTransaction(nsStyledElement& aStyledElement, + const nsAtom& aProperty, + int32_t aIntValue); + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static nsresult + RemoveCSSPropertyWithTransaction(HTMLEditor& aHTMLEditor, + nsStyledElement& aStyledElement, + nsAtom& aProperty, + const nsAString& aPropertyValue) { + return RemoveCSSPropertyInternal(aHTMLEditor, aStyledElement, aProperty, + aPropertyValue, false); + } + + /** + * Gets the specified/computed style value of a CSS property for a given + * node (or its element ancestor if it is not an element). + * + * @param aContent [IN] A DOM node. + * @param aProperty [IN] An atom containing the CSS property to get. + * @param aPropertyValue [OUT] The retrieved value of the property. + */ + static nsresult GetSpecifiedProperty(nsIContent& aContent, + nsAtom& aCSSProperty, nsAString& aValue); + MOZ_CAN_RUN_SCRIPT static nsresult GetComputedProperty(nsIContent& aContent, + nsAtom& aCSSProperty, + nsAString& aValue); + + /** + * Removes a CSS property from the specified declarations in STYLE attribute + * and removes the node if it is an useless span. + * + * @param aHTMLEditor [IN] An HTMLEditor instance + * @param aStyledElement [IN] The styled element we want to remove a style + * from. + * @param aProperty [IN] The CSS property atom to remove. + * @param aPropertyValue [IN] The value of the property we have to remove + * if the property accepts more than one value. + * @return A candidate point to put caret. + */ + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static Result<EditorDOMPoint, nsresult> + RemoveCSSInlineStyleWithTransaction(HTMLEditor& aHTMLEditor, + nsStyledElement& aStyledElement, + nsAtom* aProperty, + const nsAString& aPropertyValue); + + /** + * Get the default browser background color if we need it for + * GetCSSBackgroundColorState(). + * + * @param aColor [OUT] The default color as it is defined in prefs. + */ + static void GetDefaultBackgroundColor(nsAString& aColor); + + /** + * Get the default length unit used for CSS Indent/Outdent. + * + * @param aLengthUnit [OUT] The default length unit as it is defined in + * prefs. + */ + static void GetDefaultLengthUnit(nsAString& aLengthUnit); + + /** + * Returns the list of values for the CSS equivalences to + * the passed HTML style for the passed node. + * + * @param aElement [IN] A DOM node. + * @param aStyle [IN] The style to get the values. + * @param aValueString [OUT] The list of CSS values. + */ + MOZ_CAN_RUN_SCRIPT static nsresult GetComputedCSSEquivalentTo( + dom::Element& aElement, const EditorElementStyle& aStyle, + nsAString& aOutValue); + + /** + * Does the node aNode (or his parent if it is not an element node) carries + * the CSS equivalent styles to the HTML style for this node ? + * + * @param aHTMLEditor [IN] An HTMLEditor instance + * @param aContent [IN] A DOM node. + * @param aStyle [IN] The style to check. + * @param aInOutValue [IN/OUT] Input value is used for initial value of the + * result, out value is the list of CSS values. + * @return A boolean being true if the css properties are + * not same as initial value. + */ + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static Result<bool, nsresult> + IsComputedCSSEquivalentTo(const HTMLEditor& aHTMLEditor, nsIContent& aContent, + const EditorInlineStyle& aStyle, + nsAString& aInOutValue); + [[nodiscard]] MOZ_CAN_RUN_SCRIPT_BOUNDARY static Result<bool, nsresult> + IsSpecifiedCSSEquivalentTo(const HTMLEditor& aHTMLEditor, + nsIContent& aContent, + const EditorInlineStyle& aStyle, + nsAString& aInOutValue); + + /** + * This is a kind of Is*CSSEquivalentTo. + * Is*CSSEquivalentTo returns whether the properties aren't same as initial + * value. But this method returns whether the properties aren't set. + * If node is <span style="font-weight: normal"/>, + * - Is(Computed|Specified)CSSEquivalentTo returns false. + * - Have(Computed|Specified)CSSEquivalentStyles returns true. + * + * @param aHTMLEditor [IN] An HTMLEditor instance + * @param aContent [IN] A DOM node. + * @param aStyle [IN] The style to check. + * @return A boolean being true if the css properties are + * not set. + */ + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static Result<bool, nsresult> + HaveComputedCSSEquivalentStyles(const HTMLEditor& aHTMLEditor, + nsIContent& aContent, + const EditorInlineStyle& aStyle); + [[nodiscard]] MOZ_CAN_RUN_SCRIPT_BOUNDARY static Result<bool, nsresult> + HaveSpecifiedCSSEquivalentStyles(const HTMLEditor& aHTMLEditor, + nsIContent& aContent, + const EditorInlineStyle& aStyle); + + /** + * Adds to the node the CSS inline styles equivalent to the HTML style + * and return the number of CSS properties set by the call. + * + * @param aHTMLEditor [IN} An HTMLEditor instance + * @param aNode [IN] A DOM node. + * @param aStyleToSet [IN] The style to set. Can be EditorInlineStyle. + * @param aValue [IN] The attribute or style value of aStyleToSet. + * + * @return The number of CSS properties set by the call. + */ + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static Result<size_t, nsresult> + SetCSSEquivalentToStyle(WithTransaction aWithTransaction, + HTMLEditor& aHTMLEditor, + nsStyledElement& aStyledElement, + const EditorElementStyle& aStyleToSet, + const nsAString* aValue); + + /** + * Removes from the node the CSS inline styles equivalent to the HTML style. + * + * @param aHTMLEditor [IN} An HTMLEditor instance + * @param aStyledElement [IN] A DOM Element (must not be null). + * @param aStyleToRemove [IN] The style to remove. Can be EditorInlineStyle. + * @param aAttribute [IN] An atom to an attribute name or nullptr if + * irrelevant. + * @param aValue [IN] The attribute value. + */ + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static nsresult RemoveCSSEquivalentToStyle( + WithTransaction aWithTransaction, HTMLEditor& aHTMLEditor, + nsStyledElement& aStyledElement, const EditorElementStyle& aStyleToRemove, + const nsAString* aValue); + + /** + * Parses a "xxxx.xxxxxuuu" string where x is a digit and u an alpha char. + * + * @param aString [IN] Input string to parse. + * @param aValue [OUT] Numeric part. + * @param aUnit [OUT] Unit part. + */ + static void ParseLength(const nsAString& aString, float* aValue, + nsAtom** aUnit); + + /** + * DoStyledElementsHaveSameStyle compares two elements and checks if they have + * the same specified CSS declarations in the STYLE attribute. The answer is + * always false if at least one of them carries an ID or a class. + * + * @param aStyledElement [IN] A styled element. + * @param aOtherStyledElement [IN] The other styled element. + * @return true if the two elements are considered to + * have same styles. + */ + static bool DoStyledElementsHaveSameStyle( + nsStyledElement& aStyledElement, nsStyledElement& aOtherStyledElement); + + /** + * Gets the computed style for a given element. Can return null. + */ + static already_AddRefed<nsComputedDOMStyle> GetComputedStyle( + dom::Element* aElement); + + private: + enum class StyleType { Specified, Computed }; + + /** + * Retrieves the CSS property atom from an enum. + * + * @param aProperty The enum value for the property. + * @return The corresponding atom. + */ + static nsStaticAtom* GetCSSPropertyAtom(nsCSSEditableProperty aProperty); + + struct CSSDeclaration { + nsStaticAtom& mProperty; + nsString const mValue; + }; + + /** + * Retrieves the CSS declarations for aEquivTable. + * + * @param aEquivTable The equivalence table. + * @param aValue Optional. If specified, may return only + * matching declarations to this value (depends on + * the style, check how is aInputString of + * nsProcessValueFunc for the details). + * @param aHandlingFor What's the purpose of calling this. + * @param aOutCSSDeclarations [OUT] The array of CSS declarations. + */ + enum class HandlingFor { GettingStyle, SettingStyle, RemovingStyle }; + static void GetCSSDeclarations(const CSSEquivTable* aEquivTable, + const nsAString* aValue, + HandlingFor aHandlingFor, + nsTArray<CSSDeclaration>& aOutCSSDeclarations); + + /** + * Retrieves the CSS declarations equivalent to the given aStyle/aValue on + * aElement. + * + * @param aElement The DOM node. + * @param aStyle The style to get equivelent CSS properties and + * values. + * @param aValue Optional. If specified, may return only + * matching declarations to this value (depends on + * the style, check how is aInputString of + * nsProcessValueFunc for the details). + * @param aHandlingFor What's the purpose of calling this. + * @param aOutCSSDeclarations [OUT] The array of CSS declarations. + */ + static void GetCSSDeclarations(dom::Element& aElement, + const EditorElementStyle& aStyle, + const nsAString* aValue, + HandlingFor aHandlingFor, + nsTArray<CSSDeclaration>& aOutCSSDeclarations); + + /** + * Back-end for GetSpecifiedProperty and GetComputedProperty. + * + * @param aNode [IN] A DOM node. + * @param aProperty [IN] A CSS property. + * @param aValue [OUT] The retrieved value for this property. + */ + MOZ_CAN_RUN_SCRIPT static nsresult GetComputedCSSInlinePropertyBase( + nsIContent& aContent, nsAtom& aCSSProperty, nsAString& aValue); + static nsresult GetSpecifiedCSSInlinePropertyBase(nsIContent& aContent, + nsAtom& aCSSProperty, + nsAString& aValue); + + /** + * Those methods are wrapped with corresponding methods which do not have + * "Internal" in their names. Don't use these methods directly even if + * you want to use one of them in this class. + * Note that these methods may run scrip only when StyleType is Computed. + */ + MOZ_CAN_RUN_SCRIPT static nsresult GetCSSEquivalentTo( + dom::Element& aElement, const EditorElementStyle& aStyle, + nsAString& aOutValue, StyleType aStyleType); + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static Result<bool, nsresult> + IsCSSEquivalentTo(const HTMLEditor& aHTMLEditor, nsIContent& aContent, + const EditorInlineStyle& aStyle, nsAString& aInOutValue, + StyleType aStyleType); + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static Result<bool, nsresult> + HaveCSSEquivalentStyles(const HTMLEditor& aHTMLEditor, nsIContent& aContent, + const EditorInlineStyle& aStyle, + StyleType aStyleType); + + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static nsresult RemoveCSSPropertyInternal( + HTMLEditor& aHTMLEditor, nsStyledElement& aStyledElement, + nsAtom& aProperty, const nsAString& aPropertyValue, + bool aSuppressTxn = false); + [[nodiscard]] MOZ_CAN_RUN_SCRIPT static nsresult SetCSSPropertyInternal( + HTMLEditor& aHTMLEditor, nsStyledElement& aStyledElement, + nsAtom& aProperty, const nsAString& aValue, bool aSuppressTxn = false); + + /** + * Answers true if the given aStyle on aElement or an element whose name is + * aTagName has a CSS equivalence in this implementation. + * + * @param aTagName [IN] Tag name of an element. + * @param aElement [IN] An element. + * @param aStyle [IN] The style you want to check. + * @return A boolean saying if the tag/attribute has a CSS + * equiv. + */ + [[nodiscard]] static bool IsCSSEditableStyle( + const nsAtom& aTagName, const EditorElementStyle& aStyle); + [[nodiscard]] static bool IsCSSEditableStyle( + const dom::Element& aElement, const EditorElementStyle& aStyle); + + friend class EditorElementStyle; // for IsCSSEditableStyle +}; + +#define NS_EDITOR_INDENT_INCREMENT_IN 0.4134f +#define NS_EDITOR_INDENT_INCREMENT_CM 1.05f +#define NS_EDITOR_INDENT_INCREMENT_MM 10.5f +#define NS_EDITOR_INDENT_INCREMENT_PT 29.76f +#define NS_EDITOR_INDENT_INCREMENT_PC 2.48f +#define NS_EDITOR_INDENT_INCREMENT_EM 3 +#define NS_EDITOR_INDENT_INCREMENT_EX 6 +#define NS_EDITOR_INDENT_INCREMENT_PX 40 +#define NS_EDITOR_INDENT_INCREMENT_PERCENT 4 + +} // namespace mozilla + +#endif // #ifndef CSSEditUtils_h |