详细分析解释一下chromium源码中的下面的函数：
class OmniboxViewViews
: public OmniboxView,
public views::Textfield,
#if BUILDFLAG(IS_CHROMEOS)
public ash::input_method::InputMethodManager::CandidateWindowObserver,
#endif
public views::TextfieldController,
public ui::CompositorObserver,
public TemplateURLServiceObserver {
METADATA_HEADER(OmniboxViewViews, views::Textfield)
public:
// Max width of the gradient mask used to smooth ElideAnimation edges.
static const int kSmoothingGradientMaxWidth = 15;
OmniboxViewViews(std::unique_ptr<OmniboxClient> client,
bool popup_window_mode,
LocationBarView* location_bar_view,
const gfx::FontList& font_list);
OmniboxViewViews(const OmniboxViewViews&) = delete;
OmniboxViewViews& operator=(const OmniboxViewViews&) = delete;
~OmniboxViewViews() override;
// Initialize, create the underlying views, etc.
void Init();
// Exposes the RenderText for tests.
#if defined(UNIT_TEST)
gfx::RenderText* GetRenderText() { return views::Textfield::GetRenderText(); }
#endif
// For use when switching tabs, this saves the current state onto the tab so
// that it can be restored during a later call to Update().
void SaveStateToTab(content::WebContents* tab);
// Called when the window's active tab changes.
void OnTabChanged(const content::WebContents* web_contents);
// Called to clear the saved state for |web_contents|.
void ResetTabState(content::WebContents* web_contents);
// Installs the placeholder text with the name of the current default search
// provider. For example, if Google is the default search provider, this shows
// "Search Google or type a URL" when the Omnibox is empty and unfocused.
void InstallPlaceholderText();
// Indicates if the cursor is at the end of the input. Requires that both
// ends of the selection reside there.
bool GetSelectionAtEnd() const;
// Returns the width in pixels needed to display the current text. The
// returned value includes margins.
int GetTextWidth() const;
// Returns the width in pixels needed to display the current text unelided.
int GetUnelidedTextWidth() const;
// Returns the omnibox's width in pixels.
int GetWidth() const;
// OmniboxView:
void EmphasizeURLComponents() override;
void Update() override;
std::u16string GetText() const override;
using OmniboxView::SetUserText;
void SetUserText(const std::u16string& text, bool update_popup) override;
void SetWindowTextAndCaretPos(const std::u16string& text,
size_t caret_pos,
bool update_popup,
bool notify_text_changed) override;
void SetAdditionalText(const std::u16string& additional_text) override;
void EnterKeywordModeForDefaultSearchProvider() override;
bool IsSelectAll() const override;
void GetSelectionBounds(std::u16string::size_type* start,
std::u16string::size_type* end) const override;
void SelectAll(bool reversed) override;
void RevertAll() override;
void SetFocus(bool is_user_initiated) override;
bool IsImeComposing() const override;
gfx::NativeView GetRelativeWindowForPopup() const override;
bool IsImeShowingPopup() const override;
// views::Textfield:
gfx::Size GetMinimumSize() const override;
bool OnMousePressed(const ui::MouseEvent& event) override;
bool OnMouseDragged(const ui::MouseEvent& event) override;
void OnMouseReleased(const ui::MouseEvent& event) override;
void OnPaint(gfx::Canvas* canvas) override;
void ExecuteCommand(int command_id, int event_flags) override;
void OnInputMethodChanged() override;
void AddedToWidget() override;
void RemovedFromWidget() override;
std::u16string GetLabelForCommandId(int command_id) const override;
bool IsCommandIdEnabled(int command_id) const override;
// For testing only.
OmniboxPopupView* GetPopupViewForTesting() const;
protected:
// OmniboxView:
void UpdateSchemeStyle(const gfx::Range& range) override;
// views::Textfield:
void OnThemeChanged() override;
bool IsDropCursorForInsertion() const override;
// Wrappers around Textfield methods that tests can override.
virtual void ApplyColor(SkColor color, const gfx::Range& range);
virtual void ApplyStyle(gfx::TextStyle style,
bool value,
const gfx::Range& range);
private:
friend class TestingOmniboxView;
FRIEND_TEST_ALL_PREFIXES(OmniboxPopupViewViewsTest, EmitAccessibilityEvents);
// TODO(tommycli): Remove the rest of these friends after porting these
// browser tests to unit tests.
FRIEND_TEST_ALL_PREFIXES(OmniboxViewViewsTest, CloseOmniboxPopupOnTextDrag);
FRIEND_TEST_ALL_PREFIXES(OmniboxViewViewsTest, FriendlyAccessibleLabel);
FRIEND_TEST_ALL_PREFIXES(OmniboxViewViewsTest, DoNotNavigateOnDrop);
FRIEND_TEST_ALL_PREFIXES(OmniboxViewViewsTest, AyncDropCallback);
FRIEND_TEST_ALL_PREFIXES(OmniboxViewViewsTest, AccessibleTextSelectBoundTest);
enum class UnelisionGesture {
HOME_KEY_PRESSED,
MOUSE_RELEASE,
OTHER,
};
// Update the field with |text| and set the selection. |ranges| should not be
// empty; even text with no selections must have at least 1 empty range in
// |ranges| to indicate the cursor position.
void SetTextAndSelectedRange(const std::u16string& text,
const gfx::Range& selection);
// Returns the selected text.
std::u16string_view GetSelectedText() const;
void UpdateAccessibleTextSelection() override;
// Paste text from the clipboard into the omnibox.
// Textfields implementation of Paste() pastes the contents of the clipboard
// as is. We want to strip whitespace and other things (see GetClipboardText()
// for details). The function invokes OnBefore/AfterPossibleChange() as
// necessary.
void OnOmniboxPaste();
// Handle keyword hint tab-to-search and tabbing through dropdown results.
bool HandleEarlyTabActions(const ui::KeyEvent& event);
void ClearAccessibilityLabel();
void SetAccessibilityLabel(const std::u16string& display_text,
const AutocompleteMatch& match,
bool notify_text_changed) override;
// Returns true if the user text was updated with the full URL (without
// steady-state elisions). |gesture| is the user gesture causing unelision.
bool UnapplySteadyStateElisions(UnelisionGesture gesture);
#if BUILDFLAG(IS_MAC)
void AnnounceFriendlySuggestionText();
#endif
// Get the preferred text input type, this checks the IME locale on Windows.
ui::TextInputType GetPreferredTextInputType() const;
// OmniboxView:
void SetCaretPos(size_t caret_pos) override;
void UpdatePopup() override;
void ApplyCaretVisibility() override;
void OnTemporaryTextMaybeChanged(const std::u16string& display_text,
const AutocompleteMatch& match,
bool save_original_selection,
bool notify_text_changed) override;
void OnInlineAutocompleteTextMaybeChanged(
const std::u16string& user_text,
const std::u16string& inline_autocompletion) override;
void OnInlineAutocompleteTextCleared() override;
void OnRevertTemporaryText(const std::u16string& display_text,
const AutocompleteMatch& match) override;
void OnBeforePossibleChange() override;
bool OnAfterPossibleChange(bool allow_keyword_ui_change) override;
void OnKeywordPlaceholderTextChange() override;
gfx::NativeView GetNativeView() const override;
void ShowVirtualKeyboardIfEnabled() override;
void HideImeIfNeeded() override;
int GetOmniboxTextLength() const override;
void SetEmphasis(bool emphasize, const gfx::Range& range) override;
// views::View
void OnMouseMoved(const ui::MouseEvent& event) override;
void OnMouseExited(const ui::MouseEvent& event) override;
// views::Textfield:
bool IsItemForCommandIdDynamic(int command_id) const override;
void OnGestureEvent(ui::GestureEvent* event) override;
bool SkipDefaultKeyEventProcessing(const ui::KeyEvent& event) override;
bool HandleAccessibleAction(const ui::AXActionData& action_data) override;
void OnFocus() override;
void OnBlur() override;
std::u16string GetSelectionClipboardText() const override;
void DoInsertChar(char16_t ch) override;
bool IsTextEditCommandEnabled(ui::TextEditCommand command) const override;
void ExecuteTextEditCommand(ui::TextEditCommand command) override;
bool ShouldShowPlaceholderText() const override;
void UpdateAccessibleValue() override;
// ash::input_method::InputMethodManager::CandidateWindowObserver:
#if BUILDFLAG(IS_CHROMEOS)
void CandidateWindowOpened(
ash::input_method::InputMethodManager* manager) override;
void CandidateWindowClosed(
ash::input_method::InputMethodManager* manager) override;
#endif
// views::TextfieldController:
void ContentsChanged(views::Textfield* sender,
const std::u16string& new_contents) override;
bool HandleKeyEvent(views::Textfield* sender,
const ui::KeyEvent& key_event) override;
void OnBeforeUserAction(views::Textfield* sender) override;
void OnAfterUserAction(views::Textfield* sender) override;
void OnAfterCutOrCopy(ui::ClipboardBuffer clipboard_buffer) override;
void OnWriteDragData(ui::OSExchangeData* data) override;
void OnGetDragOperationsForTextfield(int* drag_operations) override;
void AppendDropFormats(
int* formats,
std::set<ui::ClipboardFormatType>* format_types) override;
ui::mojom::DragOperation OnDrop(const ui::DropTargetEvent& event) override;
views::View::DropCallback CreateDropCallback(
const ui::DropTargetEvent& event) override;
void UpdateContextMenu(ui::SimpleMenuModel* menu_contents) override;
// ui::SimpleMenuModel::Delegate:
bool IsCommandIdChecked(int id) const override;
// ui::CompositorObserver:
void OnCompositingDidCommit(ui::Compositor* compositor) override;
void OnCompositingStarted(ui::Compositor* compositor,
base::TimeTicks start_time) override;
void OnDidPresentCompositorFrame(
uint32_t frame_token,
const gfx::PresentationFeedback& feedback) override;
void OnCompositingShuttingDown(ui::Compositor* compositor) override;
// TemplateURLServiceObserver:
void OnTemplateURLServiceChanged() override;
// Permits launch of the external protocol handler after user actions in
// the omnibox. The handler needs to be informed that omnibox input should
// always be considered "user gesture-triggered", lest it always return BLOCK.
void PermitExternalProtocolHandler();
// Drops dragged text and updates `output_drag_op` accordingly.
void PerformDrop(const ui::DropTargetEvent& event,
ui::mojom::DragOperation& output_drag_op,
std::unique_ptr<ui::LayerTreeOwner> drag_image_layer_owner);
// Helper method to construct part of the context menu.
void MaybeAddSendTabToSelfItem(ui::SimpleMenuModel* menu_contents);
// Called when the popup view becomes visible.
void OnPopupOpened();
// Helper for updating placeholder color depending on whether its a keyword or
// DSE placeholder.
void UpdatePlaceholderTextColor();
// When true, the location bar view is read only and also is has a slightly
// different presentation (smaller font size). This is used for popups.
bool popup_window_mode_;
// Owns either an OmniboxPopupViewViews or an OmniboxPopupViewWebUI.
std::unique_ptr<OmniboxPopupView> popup_view_;
base::CallbackListSubscription popup_view_opened_subscription_;
// Selection persisted across temporary text changes, like popup suggestions.
gfx::Range saved_temporary_selection_;
// Holds the user's selection across focus changes. There is only a saved
// selection if this range IsValid().
gfx::Range saved_selection_for_focus_change_;
// Tracking state before and after a possible change.
State state_before_change_;
bool ime_composing_before_change_ = false;
// |location_bar_view_| can be NULL in tests.
raw_ptr<LocationBarView> location_bar_view_;
#if BUILDFLAG(IS_CHROMEOS)
// True if the IME candidate window is open. When this is true, we want to
// avoid showing the popup. So far, the candidate window is detected only
// on Chrome OS.
bool ime_candidate_window_open_ = false;
#endif
// True if any mouse button is currently depressed.
bool is_mouse_pressed_ = false;
// Applies a minimum threshold to drag events after unelision. Because the
// text shifts after unelision, we don't want unintentional mouse drags to
// change the selection.
bool filter_drag_events_for_unelision_ = false;
// Should we select all the text when we see the mouse button get released?
// We select in response to a click that focuses the omnibox, but we defer
// until release, setting this variable back to false if we saw a drag, to
// allow the user to select just a portion of the text.
bool select_all_on_mouse_release_ = false;
// Indicates if we want to select all text in the omnibox when we get a
// GESTURE_TAP. We want to select all only when the textfield is not in focus
// and gets a tap. So we use this variable to remember focus state before tap.
bool select_all_on_gesture_tap_ = false;
// Whether the user should be notified if the clipboard is restricted.
bool show_rejection_ui_if_any_ = false;
// Keep track of the word that would be selected if URL is unelided between
// a single and double click. This is an edge case where the elided URL is
// selected. On the double click, unelision is performed in between the first
// and second clicks. This results in both the wrong word to be selected and
// the wrong selection length. For example, if example.com is shown and you
// try to double click on the "x", it unelides to https://example.com after
// the first click, resulting in "https" being selected.
size_t next_double_click_selection_len_ = 0;
size_t next_double_click_selection_offset_ = 0;
// The time of the first character insert operation that has not yet been
// painted. Used to measure omnibox responsiveness with a histogram.
base::TimeTicks insert_char_time_;
// The state machine for logging the Omnibox.CharTypedToRepaintLatency
// histogram.
enum {
NOT_ACTIVE, // Not currently tracking a char typed event.
CHAR_TYPED, // Character was typed.
ON_PAINT_CALLED, // Character was typed and OnPaint() called.
COMPOSITING_COMMIT, // Compositing was committed after OnPaint().
COMPOSITING_STARTED, // Compositing was started.
} latency_histogram_state_;
// The currently selected match, if any, with additional labelling text
// such as the document title and the type of search, for example:
// "Google https://google.com location from bookmark", or
// "cats are liquid search suggestion".
std::u16string friendly_suggestion_text_;
// The number of added labelling characters before editable text begins.
// For example, "Google https://google.com location from history",
// this is set to 7 (the length of "Google ").
int friendly_suggestion_text_prefix_length_;
base::ScopedObservation<ui::Compositor, ui::CompositorObserver>
scoped_compositor_observation_{this};
base::ScopedObservation<TemplateURLService, TemplateURLServiceObserver>
scoped_template_url_service_observation_{this};
PrefChangeRegistrar pref_change_registrar_;
base::WeakPtrFactory<OmniboxViewViews> weak_factory_{this};
};
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