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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 nsTextAttrs_h_
+#define nsTextAttrs_h_
+
+#include "nsCOMPtr.h"
+#include "nsColor.h"
+#include "nsStyleConsts.h"
+
+class nsIFrame;
+class nsIPersistentProperties;
+class nsIContent;
+class nsDeviceContext;
+
+namespace mozilla {
+namespace a11y {
+
+class Accessible;
+class HyperTextAccessible;
+
+/**
+ * Used to expose text attributes for the hyper text accessible (see
+ * HyperTextAccessible class).
+ *
+ * @note "invalid: spelling" text attribute is implemented entirely in
+ * HyperTextAccessible class.
+ */
+class TextAttrsMgr
+{
+public:
+ /**
+ * Constructor. Used to expose default text attributes.
+ */
+ explicit TextAttrsMgr(HyperTextAccessible* aHyperTextAcc) :
+ mOffsetAcc(nullptr), mHyperTextAcc(aHyperTextAcc),
+ mOffsetAccIdx(-1), mIncludeDefAttrs(true) { }
+
+ /**
+ * Constructor. Used to expose text attributes at the given offset.
+ *
+ * @param aHyperTextAcc [in] hyper text accessible text attributes are
+ * calculated for
+ * @param aIncludeDefAttrs [optional] indicates whether default text
+ * attributes should be included into list of exposed
+ * text attributes
+ * @param oOffsetAcc [optional] offset an accessible the text attributes
+ * should be calculated for
+ * @param oOffsetAccIdx [optional] index in parent of offset accessible
+ */
+ TextAttrsMgr(HyperTextAccessible* aHyperTextAcc,
+ bool aIncludeDefAttrs,
+ Accessible* aOffsetAcc,
+ int32_t aOffsetAccIdx) :
+ mOffsetAcc(aOffsetAcc), mHyperTextAcc(aHyperTextAcc),
+ mOffsetAccIdx(aOffsetAccIdx), mIncludeDefAttrs(aIncludeDefAttrs) { }
+
+ /*
+ * Return text attributes and hyper text offsets where these attributes are
+ * applied. Offsets are calculated in the case of non default attributes.
+ *
+ * @note In the case of default attributes pointers on hyper text offsets
+ * must be skipped.
+ *
+ * @param aAttributes [in, out] text attributes list
+ * @param aStartHTOffset [out, optional] start hyper text offset
+ * @param aEndHTOffset [out, optional] end hyper text offset
+ */
+ void GetAttributes(nsIPersistentProperties* aAttributes,
+ uint32_t* aStartHTOffset = nullptr,
+ uint32_t* aEndHTOffset = nullptr);
+
+protected:
+ /**
+ * Calculates range (start and end offsets) of text where the text attributes
+ * are stretched. New offsets may be smaller if one of text attributes changes
+ * its value before or after the given offsets.
+ *
+ * @param aTextAttrArray [in] text attributes array
+ * @param aAttrArrayLen [in] text attributes array length
+ * @param aStartHTOffset [in, out] the start offset
+ * @param aEndHTOffset [in, out] the end offset
+ */
+ class TextAttr;
+ void GetRange(TextAttr* aAttrArray[], uint32_t aAttrArrayLen,
+ uint32_t* aStartOffset, uint32_t* aEndOffset);
+
+private:
+ Accessible* mOffsetAcc;
+ HyperTextAccessible* mHyperTextAcc;
+ int32_t mOffsetAccIdx;
+ bool mIncludeDefAttrs;
+
+protected:
+
+ /**
+ * Interface class of text attribute class implementations.
+ */
+ class TextAttr
+ {
+ public:
+ /**
+ * Expose the text attribute to the given attribute set.
+ *
+ * @param aAttributes [in] the given attribute set
+ * @param aIncludeDefAttrValue [in] if true then attribute is exposed even
+ * if its value is the same as default one
+ */
+ virtual void Expose(nsIPersistentProperties* aAttributes,
+ bool aIncludeDefAttrValue) = 0;
+
+ /**
+ * Return true if the text attribute value on the given element equals with
+ * predefined attribute value.
+ */
+ virtual bool Equal(Accessible* aAccessible) = 0;
+ };
+
+
+ /**
+ * Base class to work with text attributes. See derived classes below.
+ */
+ template<class T>
+ class TTextAttr : public TextAttr
+ {
+ public:
+ explicit TTextAttr(bool aGetRootValue) : mGetRootValue(aGetRootValue) {}
+
+ // TextAttr
+ virtual void Expose(nsIPersistentProperties* aAttributes,
+ bool aIncludeDefAttrValue) override
+ {
+ if (mGetRootValue) {
+ if (mIsRootDefined)
+ ExposeValue(aAttributes, mRootNativeValue);
+ return;
+ }
+
+ if (mIsDefined) {
+ if (aIncludeDefAttrValue || mRootNativeValue != mNativeValue)
+ ExposeValue(aAttributes, mNativeValue);
+ return;
+ }
+
+ if (aIncludeDefAttrValue && mIsRootDefined)
+ ExposeValue(aAttributes, mRootNativeValue);
+ }
+
+ virtual bool Equal(Accessible* aAccessible) override
+ {
+ T nativeValue;
+ bool isDefined = GetValueFor(aAccessible, &nativeValue);
+
+ if (!mIsDefined && !isDefined)
+ return true;
+
+ if (mIsDefined && isDefined)
+ return nativeValue == mNativeValue;
+
+ if (mIsDefined)
+ return mNativeValue == mRootNativeValue;
+
+ return nativeValue == mRootNativeValue;
+ }
+
+ protected:
+
+ // Expose the text attribute with the given value to attribute set.
+ virtual void ExposeValue(nsIPersistentProperties* aAttributes,
+ const T& aValue) = 0;
+
+ // Return native value for the given DOM element.
+ virtual bool GetValueFor(Accessible* aAccessible, T* aValue) = 0;
+
+ // Indicates if root value should be exposed.
+ bool mGetRootValue;
+
+ // Native value and flag indicating if the value is defined (initialized in
+ // derived classes). Note, undefined native value means it is inherited
+ // from root.
+ MOZ_INIT_OUTSIDE_CTOR T mNativeValue;
+ MOZ_INIT_OUTSIDE_CTOR bool mIsDefined;
+
+ // Native root value and flag indicating if the value is defined (initialized
+ // in derived classes).
+ MOZ_INIT_OUTSIDE_CTOR T mRootNativeValue;
+ MOZ_INIT_OUTSIDE_CTOR bool mIsRootDefined;
+ };
+
+
+ /**
+ * Class is used for the work with 'language' text attribute.
+ */
+ class LangTextAttr : public TTextAttr<nsString>
+ {
+ public:
+ LangTextAttr(HyperTextAccessible* aRoot, nsIContent* aRootElm,
+ nsIContent* aElm);
+ virtual ~LangTextAttr();
+
+ protected:
+
+ // TextAttr
+ virtual bool GetValueFor(Accessible* aAccessible, nsString* aValue) override;
+ virtual void ExposeValue(nsIPersistentProperties* aAttributes,
+ const nsString& aValue) override;
+
+ private:
+ nsCOMPtr<nsIContent> mRootContent;
+ };
+
+
+ /**
+ * Class is used for the 'invalid' text attribute. Note, it calculated
+ * the attribute from aria-invalid attribute only; invalid:spelling attribute
+ * calculated from misspelled text in the editor is managed by
+ * HyperTextAccessible and applied on top of the value from aria-invalid.
+ */
+ class InvalidTextAttr : public TTextAttr<uint32_t>
+ {
+ public:
+ InvalidTextAttr(nsIContent* aRootElm, nsIContent* aElm);
+ virtual ~InvalidTextAttr() { };
+
+ protected:
+
+ enum {
+ eFalse,
+ eGrammar,
+ eSpelling,
+ eTrue
+ };
+
+ // TextAttr
+ virtual bool GetValueFor(Accessible* aAccessible, uint32_t* aValue) override;
+ virtual void ExposeValue(nsIPersistentProperties* aAttributes,
+ const uint32_t& aValue) override;
+
+ private:
+ bool GetValue(nsIContent* aElm, uint32_t* aValue);
+ nsIContent* mRootElm;
+ };
+
+
+ /**
+ * Class is used for the work with 'background-color' text attribute.
+ */
+ class BGColorTextAttr : public TTextAttr<nscolor>
+ {
+ public:
+ BGColorTextAttr(nsIFrame* aRootFrame, nsIFrame* aFrame);
+ virtual ~BGColorTextAttr() { }
+
+ protected:
+
+ // TextAttr
+ virtual bool GetValueFor(Accessible* aAccessible, nscolor* aValue)
+ override;
+ virtual void ExposeValue(nsIPersistentProperties* aAttributes,
+ const nscolor& aValue) override;
+
+ private:
+ bool GetColor(nsIFrame* aFrame, nscolor* aColor);
+ nsIFrame* mRootFrame;
+ };
+
+
+ /**
+ * Class is used for the work with 'color' text attribute.
+ */
+ class ColorTextAttr : public TTextAttr<nscolor>
+ {
+ public:
+ ColorTextAttr(nsIFrame* aRootFrame, nsIFrame* aFrame);
+ virtual ~ColorTextAttr() { }
+
+ protected:
+
+ // TTextAttr
+ virtual bool GetValueFor(Accessible* aAccessible, nscolor* aValue)
+ override;
+ virtual void ExposeValue(nsIPersistentProperties* aAttributes,
+ const nscolor& aValue) override;
+ };
+
+
+ /**
+ * Class is used for the work with "font-family" text attribute.
+ */
+ class FontFamilyTextAttr : public TTextAttr<nsString>
+ {
+ public:
+ FontFamilyTextAttr(nsIFrame* aRootFrame, nsIFrame* aFrame);
+ virtual ~FontFamilyTextAttr() { }
+
+ protected:
+
+ // TTextAttr
+ virtual bool GetValueFor(Accessible* aAccessible, nsString* aValue)
+ override;
+ virtual void ExposeValue(nsIPersistentProperties* aAttributes,
+ const nsString& aValue) override;
+
+ private:
+
+ bool GetFontFamily(nsIFrame* aFrame, nsString& aFamily);
+ };
+
+
+ /**
+ * Class is used for the work with "font-size" text attribute.
+ */
+ class FontSizeTextAttr : public TTextAttr<nscoord>
+ {
+ public:
+ FontSizeTextAttr(nsIFrame* aRootFrame, nsIFrame* aFrame);
+ virtual ~FontSizeTextAttr() { }
+
+ protected:
+
+ // TTextAttr
+ virtual bool GetValueFor(Accessible* aAccessible, nscoord* aValue)
+ override;
+ virtual void ExposeValue(nsIPersistentProperties* aAttributes,
+ const nscoord& aValue) override;
+
+ private:
+ nsDeviceContext* mDC;
+ };
+
+
+ /**
+ * Class is used for the work with "font-style" text attribute.
+ */
+ class FontStyleTextAttr : public TTextAttr<nscoord>
+ {
+ public:
+ FontStyleTextAttr(nsIFrame* aRootFrame, nsIFrame* aFrame);
+ virtual ~FontStyleTextAttr() { }
+
+ protected:
+
+ // TTextAttr
+ virtual bool GetValueFor(Accessible* aContent, nscoord* aValue)
+ override;
+ virtual void ExposeValue(nsIPersistentProperties* aAttributes,
+ const nscoord& aValue) override;
+ };
+
+
+ /**
+ * Class is used for the work with "font-weight" text attribute.
+ */
+ class FontWeightTextAttr : public TTextAttr<int32_t>
+ {
+ public:
+ FontWeightTextAttr(nsIFrame* aRootFrame, nsIFrame* aFrame);
+ virtual ~FontWeightTextAttr() { }
+
+ protected:
+
+ // TTextAttr
+ virtual bool GetValueFor(Accessible* aAccessible, int32_t* aValue)
+ override;
+ virtual void ExposeValue(nsIPersistentProperties* aAttributes,
+ const int32_t& aValue) override;
+
+ private:
+ int32_t GetFontWeight(nsIFrame* aFrame);
+ };
+
+ /**
+ * Class is used for the work with 'auto-generated' text attribute.
+ */
+ class AutoGeneratedTextAttr : public TTextAttr<bool>
+ {
+ public:
+ AutoGeneratedTextAttr(HyperTextAccessible* aHyperTextAcc,
+ Accessible* aAccessible);
+ virtual ~AutoGeneratedTextAttr() { }
+
+ protected:
+ // TextAttr
+ virtual bool GetValueFor(Accessible* aAccessible, bool* aValue)
+ override;
+ virtual void ExposeValue(nsIPersistentProperties* aAttributes,
+ const bool& aValue) override;
+ };
+
+
+ /**
+ * TextDecorTextAttr class is used for the work with
+ * "text-line-through-style", "text-line-through-color",
+ * "text-underline-style" and "text-underline-color" text attributes.
+ */
+
+ class TextDecorValue
+ {
+ public:
+ TextDecorValue() { }
+ explicit TextDecorValue(nsIFrame* aFrame);
+
+ nscolor Color() const { return mColor; }
+ uint8_t Style() const { return mStyle; }
+
+ bool IsDefined() const
+ { return IsUnderline() || IsLineThrough(); }
+ bool IsUnderline() const
+ { return mLine & NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE; }
+ bool IsLineThrough() const
+ { return mLine & NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH; }
+
+ bool operator ==(const TextDecorValue& aValue)
+ {
+ return mColor == aValue.mColor && mLine == aValue.mLine &&
+ mStyle == aValue.mStyle;
+ }
+ bool operator !=(const TextDecorValue& aValue)
+ { return !(*this == aValue); }
+
+ private:
+ nscolor mColor;
+ uint8_t mLine;
+ uint8_t mStyle;
+ };
+
+ class TextDecorTextAttr : public TTextAttr<TextDecorValue>
+ {
+ public:
+ TextDecorTextAttr(nsIFrame* aRootFrame, nsIFrame* aFrame);
+ virtual ~TextDecorTextAttr() { }
+
+ protected:
+
+ // TextAttr
+ virtual bool GetValueFor(Accessible* aAccessible, TextDecorValue* aValue)
+ override;
+ virtual void ExposeValue(nsIPersistentProperties* aAttributes,
+ const TextDecorValue& aValue) override;
+ };
+
+ /**
+ * Class is used for the work with "text-position" text attribute.
+ */
+
+ enum TextPosValue {
+ eTextPosNone = 0,
+ eTextPosBaseline,
+ eTextPosSub,
+ eTextPosSuper
+ };
+
+ class TextPosTextAttr : public TTextAttr<TextPosValue>
+ {
+ public:
+ TextPosTextAttr(nsIFrame* aRootFrame, nsIFrame* aFrame);
+ virtual ~TextPosTextAttr() { }
+
+ protected:
+
+ // TextAttr
+ virtual bool GetValueFor(Accessible* aAccessible, TextPosValue* aValue)
+ override;
+ virtual void ExposeValue(nsIPersistentProperties* aAttributes,
+ const TextPosValue& aValue) override;
+
+ private:
+ TextPosValue GetTextPosValue(nsIFrame* aFrame) const;
+ };
+
+}; // TextAttrMgr
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif