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// Copyright (c) 2012 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.
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/gfx_export.h"
namespace gfx {
// This class typically, but does not always, correspond to a physical display
// connected to the system. A fake Display may exist on a headless system, or a
// Display may correspond to a remote, virtual display.
// Note: The screen and display currently uses pixel coordinate
// system. For platforms that support DIP (density independent pixel),
// |bounds()| and |work_area| will return values in DIP coordinate
// system, not in backing pixels.
class GFX_EXPORT Display {
// Screen Rotation in clock-wise degrees.
enum Rotation {
ROTATE_0 = 0,
// The display rotation can have multiple causes for change. A user can set a
// preference. On devices with accelerometers, they can change the rotation.
// RotationSource allows for the tracking of a Rotation per source of the
// change. ROTATION_SOURCE_ACTIVE is the current rotation of the display.
// Rotation changes not due to an accelerometer, nor the user, are to use this
// source directly.
enum RotationSource {
// Touch support for the display.
enum TouchSupport {
// Creates a display with kInvalidDisplayID as default.
explicit Display(int64 id);
Display(int64 id, const Rect& bounds);
// Returns the forced device scale factor, which is given by
// "--force-device-scale-factor".
static float GetForcedDeviceScaleFactor();
// Indicates if a device scale factor is being explicitly enforced from the
// command line via "--force-device-scale-factor".
static bool HasForceDeviceScaleFactor();
// Resets the caches used to determine if a device scale factor is being
// forced from the command line via "--force-device-scale-factor", and thus
// ensures that the command line is reevaluated.
static void ResetForceDeviceScaleFactorForTesting();
// Sets/Gets unique identifier associated with the display.
// -1 means invalid display and it doesn't not exit.
int64 id() const { return id_; }
void set_id(int64 id) { id_ = id; }
// Gets/Sets the display's bounds in gfx::Screen's coordinates.
const Rect& bounds() const { return bounds_; }
void set_bounds(const Rect& bounds) { bounds_ = bounds; }
// Gets/Sets the display's work area in gfx::Screen's coordinates.
const Rect& work_area() const { return work_area_; }
void set_work_area(const Rect& work_area) { work_area_ = work_area; }
// Output device's pixel scale factor. This specifies how much the
// UI should be scaled when the actual output has more pixels than
// standard displays (which is around 100~120dpi.) The potential return
// values depend on each platforms.
float device_scale_factor() const { return device_scale_factor_; }
void set_device_scale_factor(float scale) { device_scale_factor_ = scale; }
Rotation rotation() const { return rotation_; }
void set_rotation(Rotation rotation) { rotation_ = rotation; }
int RotationAsDegree() const;
void SetRotationAsDegree(int rotation);
TouchSupport touch_support() const { return touch_support_; }
void set_touch_support(TouchSupport support) { touch_support_ = support; }
// Utility functions that just return the size of display and
// work area.
const Size& size() const { return bounds_.size(); }
const Size& work_area_size() const { return work_area_.size(); }
// Returns the work area insets.
Insets GetWorkAreaInsets() const;
// Sets the device scale factor and display bounds in pixel. This
// updates the work are using the same insets between old bounds and
// work area.
void SetScaleAndBounds(float device_scale_factor,
const gfx::Rect& bounds_in_pixel);
// Sets the display's size. This updates the work area using the same insets
// between old bounds and work area.
void SetSize(const gfx::Size& size_in_pixel);
// Computes and updates the display's work are using
// |work_area_insets| and the bounds.
void UpdateWorkAreaFromInsets(const gfx::Insets& work_area_insets);
// Returns the display's size in pixel coordinates.
gfx::Size GetSizeInPixel() const;
// Returns a string representation of the display;
std::string ToString() const;
// True if the display contains valid display id.
bool is_valid() const { return id_ != kInvalidDisplayID; }
// True if the display corresponds to internal panel.
bool IsInternal() const;
// Gets/Sets an id of display corresponding to internal panel.
static int64 InternalDisplayId();
static void SetInternalDisplayId(int64 internal_display_id);
// True if there is an internal display.
static bool HasInternalDisplay();
static const int64 kInvalidDisplayID;
int64 id_;
Rect bounds_;
Rect work_area_;
float device_scale_factor_;
Rotation rotation_;
TouchSupport touch_support_;
} // namespace gfx
#endif // UI_GFX_DISPLAY_H_