| // 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. |
| |
| #ifndef UI_BASE_LAYOUT_H_ |
| #define UI_BASE_LAYOUT_H_ |
| |
| #include <vector> |
| |
| #include "build/build_config.h" |
| #include "ui/base/ui_base_export.h" |
| #include "ui/gfx/native_widget_types.h" |
| |
| namespace ui { |
| |
| // Supported UI scale factors for the platform. This is used as an index |
| // into the array |kScaleFactorScales| which maps the enum value to a float. |
| // SCALE_FACTOR_NONE is used for density independent resources such as |
| // string, html/js files or an image that can be used for any scale factors |
| // (such as wallpapers). |
| enum ScaleFactor : int { |
| SCALE_FACTOR_NONE = 0, |
| SCALE_FACTOR_100P, |
| SCALE_FACTOR_125P, |
| SCALE_FACTOR_133P, |
| SCALE_FACTOR_140P, |
| SCALE_FACTOR_150P, |
| SCALE_FACTOR_180P, |
| SCALE_FACTOR_200P, |
| SCALE_FACTOR_250P, |
| SCALE_FACTOR_300P, |
| |
| NUM_SCALE_FACTORS // This always appears last. |
| }; |
| |
| // Changes the value of GetSupportedScaleFactors() to |scale_factors|. |
| // Use ScopedSetSupportedScaleFactors for unit tests as not to affect the |
| // state of other tests. |
| UI_BASE_EXPORT void SetSupportedScaleFactors( |
| const std::vector<ScaleFactor>& scale_factors); |
| |
| // Returns a vector with the scale factors which are supported by this |
| // platform, in ascending order. |
| UI_BASE_EXPORT const std::vector<ScaleFactor>& GetSupportedScaleFactors(); |
| |
| // Returns the supported ScaleFactor which most closely matches |scale|. |
| // Converting from float to ScaleFactor is inefficient and should be done as |
| // little as possible. |
| UI_BASE_EXPORT ScaleFactor GetSupportedScaleFactor(float image_scale); |
| |
| // Returns the ScaleFactor used by |view|. |
| UI_BASE_EXPORT float GetScaleFactorForNativeView(gfx::NativeView view); |
| |
| // Returns the image scale for the scale factor passed in. |
| UI_BASE_EXPORT float GetScaleForScaleFactor(ScaleFactor scale_factor); |
| |
| namespace test { |
| // Class which changes the value of GetSupportedScaleFactors() to |
| // |new_scale_factors| for the duration of its lifetime. |
| class UI_BASE_EXPORT ScopedSetSupportedScaleFactors { |
| public: |
| explicit ScopedSetSupportedScaleFactors( |
| const std::vector<ui::ScaleFactor>& new_scale_factors); |
| ~ScopedSetSupportedScaleFactors(); |
| |
| private: |
| std::vector<ui::ScaleFactor>* original_scale_factors_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScopedSetSupportedScaleFactors); |
| }; |
| |
| } // namespace test |
| |
| } // namespace ui |
| |
| #endif // UI_BASE_LAYOUT_H_ |