ui/qt/qt_ui.h

// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_QT_QT_UI_H_
#define UI_QT_QT_UI_H_

#include <memory>
#include <optional>

#include "base/component_export.h"
#include "base/memory/weak_ptr.h"
#include "printing/buildflags/buildflags.h"
#include "ui/color/color_provider.h"
#include "ui/color/color_provider_key.h"
#include "ui/gfx/font_render_params.h"
#include "ui/linux/linux_ui.h"
#include "ui/qt/qt_interface.h"

#if BUILDFLAG(ENABLE_PRINTING)
#include "printing/printing_context_linux.h"  // nogncheck
#endif

namespace qt {

class QtNativeTheme;

// Interface to QT desktop features.
class QtUi : public ui::LinuxUiAndTheme, QtInterface::Delegate {
 public:
  explicit QtUi(ui::LinuxUi* fallback_linux_ui);

  QtUi(const QtUi&) = delete;
  QtUi& operator=(const QtUi&) = delete;

  ~QtUi() override;

  // ui::LinuxUi:
  bool Initialize() override;
  void InitializeFontSettings() override;
  base::TimeDelta GetCursorBlinkInterval() const override;
  gfx::Image GetIconForContentType(const std::string& content_type,
                                   int size,
                                   float scale) const override;
  base::flat_map<std::string, std::string> GetKeyboardLayoutMap() override;
#if BUILDFLAG(ENABLE_PRINTING)
  printing::PrintDialogLinuxInterface* CreatePrintDialog(
      printing::PrintingContextLinux* context) override;
  gfx::Size GetPdfPaperSize(printing::PrintingContextLinux* context) override;
#endif
  ui::SelectFileDialog* CreateSelectFileDialog(
      void* listener,
      std::unique_ptr<ui::SelectFilePolicy> policy) const override;
  std::string GetCursorThemeName() override;
  int GetCursorThemeSize() override;
  std::unique_ptr<ui::LinuxInputMethodContext> CreateInputMethodContext(
      ui::LinuxInputMethodContextDelegate* delegate) const override;
  ui::TextEditCommand GetTextEditCommandForEvent(const ui::Event& event,
                                                 int text_flags) override;
  gfx::FontRenderParams GetDefaultFontRenderParams() override;
  bool AnimationsEnabled() const override;
  void AddWindowButtonOrderObserver(
      ui::WindowButtonOrderObserver* observer) override;
  void RemoveWindowButtonOrderObserver(
      ui::WindowButtonOrderObserver* observer) override;
  WindowFrameAction GetWindowFrameAction(
      WindowFrameActionSource source) override;
  std::vector<std::string> GetCmdLineFlagsForCopy() const override;

  // ui::LinuxUiTheme:
  ui::NativeTheme* GetNativeTheme() const override;
  bool GetColor(int id, SkColor* color, bool use_custom_frame) const override;
  bool GetDisplayProperty(int id, int* result) const override;
  void GetFocusRingColor(SkColor* color) const override;
  void GetActiveSelectionBgColor(SkColor* color) const override;
  void GetActiveSelectionFgColor(SkColor* color) const override;
  void GetInactiveSelectionBgColor(SkColor* color) const override;
  void GetInactiveSelectionFgColor(SkColor* color) const override;
  bool PreferDarkTheme() const override;
  void SetDarkTheme(bool dark) override;
  void SetAccentColor(std::optional<SkColor>) override;
  std::unique_ptr<ui::NavButtonProvider> CreateNavButtonProvider() override;
  ui::WindowFrameProvider* GetWindowFrameProvider(bool solid_frame,
                                                  bool tiled,
                                                  bool maximized) override;

  // QtInterface::Delegate:
  void FontChanged() override;
  void ThemeChanged() override;
  void ScaleFactorMaybeChanged() override;

 private:
  void AddNativeColorMixer(ui::ColorProvider* provider,
                           const ui::ColorProviderKey& key);

  void ScaleFactorMaybeChangedImpl();

  std::optional<SkColor> GetColor(int id, bool use_custom_frame) const;

  // TODO(crbug.com/40222643): This is a fallback for any unimplemented
  // functionality in the QT backend and should eventually be removed.
  ui::LinuxUi* const fallback_linux_ui_;

  // QT modifies argc and argv, and they must be kept alive while
  // `shim_` is alive.
  CmdLineArgs cmd_line_;

  int qt_version_ = 0;

  // Cached default font settings.
  std::optional<gfx::FontRenderParams> font_params_;
  std::unique_ptr<QtInterface> shim_;

  std::unique_ptr<QtNativeTheme> native_theme_;

  std::optional<SkColor> accent_color_;

  bool scale_factor_task_active_ = false;

  base::WeakPtrFactory<QtUi> weak_factory_{this};
};

// This should be the only symbol exported from this component.
COMPONENT_EXPORT(QT)
std::unique_ptr<ui::LinuxUiAndTheme> CreateQtUi(ui::LinuxUi* fallback_linux_ui);

}  // namespace qt

#endif  // UI_QT_QT_UI_H_