1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef UI_BASE_LAYOUT_H_ 6 #define UI_BASE_LAYOUT_H_ 7 8 #include <vector> 9 10 #include "build/build_config.h" 11 #include "ui/base/ui_export.h" 12 #include "ui/gfx/native_widget_types.h" 13 14 namespace ui { 15 16 enum DisplayLayout { 17 // The typical layout for e.g. Windows, Mac and Linux. 18 LAYOUT_DESKTOP, 19 20 // Layout optimized for touch. Used e.g. for Windows 8 Metro mode. 21 LAYOUT_TOUCH, 22 }; 23 24 // Returns the display layout that should be used. This could be used 25 // e.g. to tweak hard-coded padding that's layout specific, or choose 26 // the .pak file of theme resources to load. 27 // WARNING: this is deprecated and will be nuked as soon as aura is the default 28 // on windows. 29 UI_EXPORT DisplayLayout GetDisplayLayout(); 30 31 // Supported UI scale factors for the platform. This is used as an index 32 // into the array |kScaleFactorScales| which maps the enum value to a float. 33 // SCALE_FACTOR_NONE is used for density independent resources such as 34 // string, html/js files or an image that can be used for any scale factors 35 // (such as wallpapers). 36 enum ScaleFactor { 37 SCALE_FACTOR_NONE = 0, 38 SCALE_FACTOR_100P, 39 SCALE_FACTOR_125P, 40 SCALE_FACTOR_133P, 41 SCALE_FACTOR_140P, 42 SCALE_FACTOR_150P, 43 SCALE_FACTOR_180P, 44 SCALE_FACTOR_200P, 45 SCALE_FACTOR_300P, 46 47 NUM_SCALE_FACTORS // This always appears last. 48 }; 49 50 // Changes the value of GetSupportedScaleFactors() to |scale_factors|. 51 // Use ScopedSetSupportedScaleFactors for unit tests as not to affect the 52 // state of other tests. 53 UI_EXPORT void SetSupportedScaleFactors( 54 const std::vector<ScaleFactor>& scale_factors); 55 56 // Returns a vector with the scale factors which are supported by this 57 // platform, in ascending order. 58 UI_EXPORT const std::vector<ScaleFactor>& GetSupportedScaleFactors(); 59 60 // Returns the float scale value for |scale_factor|. 61 UI_EXPORT float GetImageScale(ScaleFactor scale_factor); 62 63 // Returns the supported ScaleFactor which most closely matches |scale|. 64 // Converting from float to ScaleFactor is inefficient and should be done as 65 // little as possible. 66 // TODO(oshima): Make ScaleFactor a class and remove this. 67 UI_EXPORT ScaleFactor GetSupportedScaleFactor(float image_scale); 68 69 // Returns the ScaleFactor used by |view|. 70 UI_EXPORT ScaleFactor GetScaleFactorForNativeView(gfx::NativeView view); 71 72 // Returns true if |scale_factor| is supported by this platform. 73 UI_EXPORT bool IsScaleFactorSupported(ScaleFactor scale_factor); 74 75 // Returns the scale factor closest to |scale| from the full list of factors. 76 // Note that it does NOT rely on the list of supported scale factors. 77 // Finding the closest match is inefficient and shouldn't be done frequently. 78 UI_EXPORT ScaleFactor FindClosestScaleFactorUnsafe(float scale); 79 80 namespace test { 81 // Class which changes the value of GetSupportedScaleFactors() to 82 // |new_scale_factors| for the duration of its lifetime. 83 class UI_EXPORT ScopedSetSupportedScaleFactors { 84 public: 85 explicit ScopedSetSupportedScaleFactors( 86 const std::vector<ui::ScaleFactor>& new_scale_factors); 87 ~ScopedSetSupportedScaleFactors(); 88 89 private: 90 std::vector<ui::ScaleFactor>* original_scale_factors_; 91 92 DISALLOW_COPY_AND_ASSIGN(ScopedSetSupportedScaleFactors); 93 }; 94 95 } // namespace test 96 97 } // namespace ui 98 99 #endif // UI_BASE_LAYOUT_H_ 100
