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234 lines
6.9 KiB
C
234 lines
6.9 KiB
C
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/* -*- 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 AccessibleCaret_h__
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#define AccessibleCaret_h__
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#include "mozilla/Attributes.h"
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#include "mozilla/dom/AnonymousContent.h"
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#include "mozilla/dom/Element.h"
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#include "nsCOMPtr.h"
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#include "nsIDOMEventListener.h"
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#include "nsISupportsBase.h"
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#include "nsISupportsImpl.h"
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#include "nsRect.h"
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#include "mozilla/RefPtr.h"
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#include "nsString.h"
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class nsIDocument;
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class nsIFrame;
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class nsIPresShell;
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struct nsPoint;
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namespace mozilla {
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// -----------------------------------------------------------------------------
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// Upon the creation of AccessibleCaret, it will insert DOM Element as an
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// anonymous content containing the caret image. The caret appearance and
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// position can be controlled by SetAppearance() and SetPosition().
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//
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// All the rect or point are relative to root frame except being specified
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// explicitly.
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//
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// None of the methods in AccessibleCaret will flush layout or style. To ensure
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// that SetPosition() works correctly, the caller must make sure the layout is
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// up to date.
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//
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// Please see the wiki page for more information.
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// https://wiki.mozilla.org/Copy_n_Paste
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class AccessibleCaret
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{
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public:
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explicit AccessibleCaret(nsIPresShell* aPresShell);
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virtual ~AccessibleCaret();
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// This enumeration representing the visibility and visual style of an
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// AccessibleCaret.
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//
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// Use SetAppearance() to change the appearance, and use GetAppearance() to
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// get the current appearance.
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enum class Appearance : uint8_t {
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// Do not display the caret at all.
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None,
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// Display the caret in default style.
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Normal,
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// The caret should be displayed logically but it is kept invisible to the
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// user. This enum is the only difference between "logically visible" and
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// "visually visible". It can be used for reasons such as:
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// 1. Out of scroll port.
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// 2. For UX requirement such as hide a caret in an empty text area.
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NormalNotShown,
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// Display the caret which is tilted to the left.
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Left,
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// Display the caret which is tilted to the right.
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Right
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};
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friend std::ostream& operator<<(std::ostream& aStream,
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const Appearance& aAppearance);
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Appearance GetAppearance() const
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{
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return mAppearance;
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}
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virtual void SetAppearance(Appearance aAppearance);
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// Return true if current appearance is either Normal, NormalNotShown, Left,
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// or Right.
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bool IsLogicallyVisible() const
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{
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return mAppearance != Appearance::None;
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}
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// Return true if current appearance is either Normal, Left, or Right.
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bool IsVisuallyVisible() const
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{
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return (mAppearance != Appearance::None) &&
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(mAppearance != Appearance::NormalNotShown);
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}
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// Set true to enable the "Text Selection Bar" described in "Text Selection
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// Visual Spec" in bug 921965.
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virtual void SetSelectionBarEnabled(bool aEnabled);
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// This enumeration representing the result returned by SetPosition().
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enum class PositionChangedResult : uint8_t {
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// Position is not changed.
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NotChanged,
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// Position is changed.
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Changed,
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// Position is out of scroll port.
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Invisible
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};
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friend std::ostream& operator<<(std::ostream& aStream,
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const PositionChangedResult& aResult);
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virtual PositionChangedResult SetPosition(nsIFrame* aFrame, int32_t aOffset);
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// Does two AccessibleCarets overlap?
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bool Intersects(const AccessibleCaret& aCaret) const;
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// Is the point within the caret's rect? The point should be relative to root
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// frame.
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bool Contains(const nsPoint& aPoint) const;
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// The geometry center of the imaginary caret (nsCaret) to which this
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// AccessibleCaret is attached. It is needed when dragging the caret.
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nsPoint LogicalPosition() const
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{
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return mImaginaryCaretRect.Center();
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}
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// Element for 'Intersects' test. Container of image and bar elements.
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dom::Element* CaretElement() const
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{
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return mCaretElementHolder->GetContentNode();
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}
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protected:
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// Argument aRect should be relative to CustomContentContainerFrame().
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void SetCaretElementStyle(const nsRect& aRect);
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void SetSelectionBarElementStyle(const nsRect& aRect);
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// Get current zoom level.
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float GetZoomLevel();
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// Element which contains the caret image for 'Contains' test.
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dom::Element* CaretImageElement() const
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{
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return CaretElement()->GetFirstElementChild();
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}
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// Element which represents the text selection bar.
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dom::Element* SelectionBarElement() const
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{
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return CaretElement()->GetLastElementChild();
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}
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nsIFrame* RootFrame() const
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{
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return mPresShell->GetRootFrame();
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}
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nsIFrame* CustomContentContainerFrame() const;
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// Transform Appearance to CSS class name in ua.css.
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static nsString AppearanceString(Appearance aAppearance);
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already_AddRefed<dom::Element> CreateCaretElement(nsIDocument* aDocument) const;
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// Inject caret element into custom content container.
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void InjectCaretElement(nsIDocument* aDocument);
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// Remove caret element from custom content container.
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void RemoveCaretElement(nsIDocument* aDocument);
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// The top-center of the imaginary caret to which this AccessibleCaret is
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// attached.
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static nsPoint CaretElementPosition(const nsRect& aRect)
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{
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return aRect.TopLeft() + nsPoint(aRect.width / 2, 0);
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}
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class DummyTouchListener final : public nsIDOMEventListener
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{
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public:
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NS_DECL_ISUPPORTS
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NS_IMETHOD HandleEvent(nsIDOMEvent* aEvent) override
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{
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return NS_OK;
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}
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private:
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virtual ~DummyTouchListener() {};
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};
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// Member variables
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Appearance mAppearance = Appearance::None;
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bool mSelectionBarEnabled = false;
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// AccessibleCaretManager owns us. When it's destroyed by
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// AccessibleCaretEventHub::Terminate() which is called in
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// PresShell::Destroy(), it frees us automatically. No need to worry we
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// outlive mPresShell.
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nsIPresShell* MOZ_NON_OWNING_REF const mPresShell = nullptr;
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RefPtr<dom::AnonymousContent> mCaretElementHolder;
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// mImaginaryCaretRect is relative to root frame.
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nsRect mImaginaryCaretRect;
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// A no-op touch-start listener which prevents APZ from panning when dragging
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// the caret.
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RefPtr<DummyTouchListener> mDummyTouchListener{new DummyTouchListener()};
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// Static class variables
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static float sWidth;
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static float sHeight;
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static float sMarginLeft;
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static float sBarWidth;
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}; // class AccessibleCaret
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std::ostream& operator<<(std::ostream& aStream,
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const AccessibleCaret::Appearance& aAppearance);
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std::ostream& operator<<(std::ostream& aStream,
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const AccessibleCaret::PositionChangedResult& aResult);
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} // namespace mozilla
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#endif // AccessibleCaret_h__
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