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      1 // Copyright 2013 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 CHROME_BROWSER_THEMES_CUSTOM_THEME_SUPPLIER_H_
      6 #define CHROME_BROWSER_THEMES_CUSTOM_THEME_SUPPLIER_H_
      7 
      8 #include "base/memory/ref_counted.h"
      9 #include "content/public/browser/browser_thread.h"
     10 #include "third_party/skia/include/core/SkColor.h"
     11 #include "ui/base/layout.h"
     12 
     13 namespace base {
     14 class RefCountedMemory;
     15 }
     16 
     17 namespace color_utils {
     18 struct HSL;
     19 }
     20 
     21 namespace gfx {
     22 class Image;
     23 }
     24 
     25 // A representation of a theme. All theme properties can be accessed through the
     26 // public methods. Subclasses are expected to override all methods which should
     27 // provide non-default values.
     28 class CustomThemeSupplier : public base::RefCountedThreadSafe<
     29     CustomThemeSupplier, content::BrowserThread::DeleteOnFileThread> {
     30  public:
     31   enum ThemeType {
     32     EXTENSION,
     33     NATIVE_X11,
     34     MANAGED_USER_THEME,
     35   };
     36 
     37   explicit CustomThemeSupplier(ThemeType type);
     38 
     39   ThemeType get_theme_type() const {
     40     return theme_type_;
     41   }
     42 
     43   // Called when the theme starts being used.
     44   virtual void StartUsingTheme();
     45 
     46   // Called when the theme is not used anymore.
     47   virtual void StopUsingTheme();
     48 
     49   // If the theme specifies data for the corresponding |id|, returns true and
     50   // writes the corresponding value to the output parameter. These methods
     51   // should not return the default data. These methods should only be called
     52   // from the UI thread.
     53   virtual bool GetTint(int id, color_utils::HSL* hsl) const;
     54   virtual bool GetColor(int id, SkColor* color) const;
     55   virtual bool GetDisplayProperty(int id, int* result) const;
     56 
     57   // Returns the theme image for |id|. Returns an empty image if no image is
     58   // found for |id|.
     59   virtual gfx::Image GetImageNamed(int id);
     60 
     61   // Returns the raw PNG encoded data for IDR_THEME_NTP_*. This method only
     62   // works for the NTP attribution and background resources.
     63   virtual base::RefCountedMemory* GetRawData(
     64       int id, ui::ScaleFactor scale_factor) const;
     65 
     66   // Whether this theme provides an image for |id|.
     67   virtual bool HasCustomImage(int id) const;
     68 
     69  protected:
     70   virtual ~CustomThemeSupplier();
     71 
     72  private:
     73   friend struct content::BrowserThread::DeleteOnThread<
     74       content::BrowserThread::FILE>;
     75   friend class base::DeleteHelper<CustomThemeSupplier>;
     76 
     77   ThemeType theme_type_;
     78 
     79   DISALLOW_COPY_AND_ASSIGN(CustomThemeSupplier);
     80 };
     81 
     82 #endif  // CHROME_BROWSER_THEMES_CUSTOM_THEME_SUPPLIER_H_
     83