ui/gfx/size_base.h

   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_GFX_SIZE_BASE_H_
   6 #define UI_GFX_SIZE_BASE_H_
   7
   8 #include "ui/base/ui_export.h"
   9
  10 namespace gfx {
  11
  12 // A size has width and height values.
  13 template<typename Class, typename Type>
  14 class UI_EXPORT SizeBase {
  15  public:
  16   Type width() const { return width_; }
  17   Type height() const { return height_; }
  18
  19   Type GetArea() const { return width_ * height_; }
  20
  21   void SetSize(Type width, Type height) {
  22     set_width(width);
  23     set_height(height);
  24   }
  25
  26   void Enlarge(Type width, Type height) {
  27     set_width(width_ + width);
  28     set_height(height_ + height);
  29   }
  30
  31   void set_width(Type width) {
  32     width_ = width < 0 ? 0 : width;
  33   }
  34   void set_height(Type height) {
  35     height_ = height < 0 ? 0 : height;
  36   }
  37
  38   void ClampToMax(const Class& max) {
  39     width_ = width_ <= max.width_ ? width_ : max.width_;
  40     height_ = height_ <= max.height_ ? height_ : max.height_;
  41   }
  42
  43   void ClampToMin(const Class& min) {
  44     width_ = width_ >= min.width_ ? width_ : min.width_;
  45     height_ = height_ >= min.height_ ? height_ : min.height_;
  46   }
  47
  48   bool IsEmpty() const {
  49     return (width_ == 0) || (height_ == 0);
  50   }
  51
  52  protected:
  53   SizeBase(Type width, Type height)
  54       : width_(width < 0 ? 0 : width),
  55       height_(height < 0 ? 0 : height) {
  56   }
  57
  58   // Destructor is intentionally made non virtual and protected.
  59   // Do not make this public.
  60   ~SizeBase() {}
  61
  62  private:
  63   Type width_;
  64   Type height_;
  65 };
  66
  67 }  // namespace gfx
  68
  69 #endif  // UI_GFX_SIZE_BASE_H_