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- // Copyright 2016 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 UI_DISPLAY_DISPLAY_LIST_H_
- #define UI_DISPLAY_DISPLAY_LIST_H_
- #include <stdint.h>
- #include <vector>
- #include "base/observer_list.h"
- #include "ui/display/display.h"
- #include "ui/display/display_export.h"
- namespace display {
- class DisplayObserver;
- // Maintains an ordered list of Displays as well as operations to add, remove
- // and update said list. Additionally maintains DisplayObservers and updates
- // them as appropriate.
- class DISPLAY_EXPORT DisplayList {
- public:
- using Displays = std::vector<Display>;
- enum class Type {
- PRIMARY,
- NOT_PRIMARY,
- };
- DisplayList();
- ~DisplayList();
- DisplayList(const DisplayList&) = delete;
- DisplayList& operator=(const DisplayList&) = delete;
- void AddObserver(DisplayObserver* observer);
- void RemoveObserver(DisplayObserver* observer);
- const Displays& displays() const { return displays_; }
- Displays::const_iterator FindDisplayById(int64_t id) const;
- // Get an iterator for the primary display. This returns an invalid iterator
- // if no such display is available. Callers must check the returned value
- // against `displays().end()` before dereferencing.
- Displays::const_iterator GetPrimaryDisplayIterator() const;
- void AddOrUpdateDisplay(const Display& display, Type type);
- // Updates the cached display based on display.id(). This returns a bitmask
- // of the changed values suitable for passing to
- // DisplayObserver::OnDisplayMetricsChanged().
- uint32_t UpdateDisplay(const Display& display);
- // Updates the cached display based on display.id(). Also updates the primary
- // display if |type| indicates |display| is the primary display. See single
- // argument version for description of return value.
- uint32_t UpdateDisplay(const Display& display, Type type);
- // Adds a new Display.
- void AddDisplay(const Display& display, Type type);
- // Removes the Display with the specified id.
- void RemoveDisplay(int64_t id);
- // Checks for general struct validity. This permits empty lists, but non-empty
- // lists must specify a primary display and the displays must not use repeated
- // or invalid ids.
- bool IsValid() const;
- base::ObserverList<DisplayObserver>* observers() { return &observers_; }
- const base::ObserverList<DisplayObserver>* observers() const {
- return &observers_;
- }
- private:
- // A non-const version of FindDisplayById.
- Displays::iterator FindDisplayByIdInternal(int64_t id);
- // The list of displays tracked by the display::Screen or other client.
- std::vector<Display> displays_;
- // The id of the primary Display in `displays_` for the display::Screen.
- int64_t primary_id_ = kInvalidDisplayId;
- base::ObserverList<DisplayObserver> observers_;
- };
- } // namespace display
- #endif // UI_DISPLAY_DISPLAY_LIST_H_
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