text: // Copyright 2018 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef CHROME_BROWSER_UI_VIEWS_OMNIBOX_OMNIBOX_TEXT_VIEW_H_
  #define CHROME_BROWSER_UI_VIEWS_OMNIBOX_OMNIBOX_TEXT_VIEW_H_
  
  #include <stddef.h>
  
  #include <memory>
  
  #include "base/memory/raw_ptr.h"
  #include "chrome/browser/ui/views/omnibox/omnibox_result_view.h"
  #include "components/omnibox/browser/autocomplete_match.h"
  #include "components/omnibox/browser/suggestion_answer.h"
  #include "ui/base/metadata/metadata_header_macros.h"
  #include "ui/gfx/font_list.h"
  #include "ui/views/view.h"
  
  namespace gfx {
  class Canvas;
  class RenderText;
  }  // namespace gfx
  
  // A view containing a render text styled via search results. This differs from
  // the general purpose views::Label class by having less general features (such
  // as selection) and more specific features (such as suggestion answer styling).
  class OmniboxTextView : public views::View {
   public:
    METADATA_HEADER(OmniboxTextView);
    explicit OmniboxTextView(OmniboxResultView* result_view);
    OmniboxTextView(const OmniboxTextView&) = delete;
    OmniboxTextView& operator=(const OmniboxTextView&) = delete;
    ~OmniboxTextView() override;
  
    // views::View:
    gfx::Size CalculatePreferredSize() const override;
    bool GetCanProcessEventsWithinSubtree() const override;
    int GetHeightForWidth(int width) const override;
    void OnPaint(gfx::Canvas* canvas) override;
  
    // Applies given part's theme color to underlying render text. Using
    // OmniboxPart::RESULTS_TEXT_DIMMED gives the gray used by Dim() in the past.
    // This is called Apply* instead of Set* because the only state kept is in
    // render_text, so call this after setting text with methods below.
    void ApplyTextColor(OmniboxPart part);
  
    // Returns the render text, or an empty string if there is none.
    const std::u16string& GetText() const;
  
    // Sets the render text with default rendering for the given |new_text|. The
    // |classifications| are used to style the text. An ImageLine incorporates
    // both the text and the styling.
    // |deemphasize| specifies whether to use a slightly smaller font than normal.
    void SetText(const std::u16string& new_text);
    void SetTextWithStyling(const std::u16string& new_text,
                            const ACMatchClassifications& classifications,
                            bool deemphasize = false);
    void SetTextWithStyling(const SuggestionAnswer::ImageLine& line,
                            bool deemphasize);
  
    // Adds the "additional" and "status" text from |line|, if any.
    void AppendExtraText(const SuggestionAnswer::ImageLine& line);
  
    // Get the height of one line of text.  This is handy if the view might have
    // multiple lines.
    int GetLineHeight() const;
  
    // Reapplies text styling to the results text, based on the types of the match
    // parts.
    void ReapplyStyling();
  
    // Creates a platform-approriate RenderText, sets its format to that of
    // a suggestion and inserts (renders) the provided |text|.
    std::unique_ptr<gfx::RenderText> CreateRenderText(
        const std::u16string& text) const;
  
   private:
    // Adds text from an answer field to the render text using appropriate style.
    // A prefix (such as separating space) may also be prepended to field text.
    void AppendText(const SuggestionAnswer::TextField& field,
                    const std::u16string& prefix);
  
    // Updates the cached maximum line height and recomputes the preferred size.
    void OnStyleChanged();
  
    // To get color values.
    raw_ptr<OmniboxResultView> result_view_;
  
    // Font settings for this view.
    int font_height_ = 0;
  
    // Whether to apply deemphasized font instead of primary omnibox font.
    // TODO(orinj): Use a more general ChromeTextContext for flexibility, or
    // otherwise clean up & unify the different ways of selecting fonts & styles.
    bool use_deemphasized_font_ = false;
  
    // Whether to wrap lines if the width is too narrow for the whole string.
    bool wrap_text_lines_ = false;
  
    // The primary data for this class.
    std::unique_ptr<gfx::RenderText> render_text_;
    // The classifications most recently passed to SetText. Used to exit
    // early instead of setting text when the text and classifications
    // match the current state of the view.
    std::unique_ptr<ACMatchClassifications> cached_classifications_;
  };
  
  #endif  // CHROME_BROWSER_UI_VIEWS_OMNIBOX_OMNIBOX_TEXT_VIEW_H_
  