ui: Add methods to clamp Sizes, Points, and Vectors from above or below.

ui/gfx/size_base.h

 // 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_GFX_SIZE_BASE_H_
 #define UI_GFX_SIZE_BASE_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 17 matching lines @@
   }
 
   void Enlarge(Type width, Type height) {
     set_width(width_ + width);
     set_height(height_ + height);
   }
 
   void set_width(Type width) { width_ = width; }
   void set_height(Type height) { height_ = height; }
 
+  void ClampFromAbove(const Class& other) {

[sky, 2012/11/09 18:23:12]

The name here is even more confusing. Sizes generally don't have an implied
direction. Is there a better name you could use?

[danakj, 2012/11/09 18:24:25]

Oh, hm. I hadn't thought of it in terms of direction. I was thinking above like,
on the number line. I'll think of something.

+    width_ = width_ <= other.width_ ? width_ : other.width_;
+    height_ = height_ <= other.height_ ? height_ : other.height_;
+  }
+
+  void ClampFromBelow(const Class& other) {
+    width_ = width_ >= other.width_ ? width_ : other.width_;
+    height_ = height_ >= other.height_ ? height_ : other.height_;
+  }
+
   bool IsEmpty() const {
     return (width_ <= 0) || (height_ <= 0);
   }
 
   void ClampToNonNegative() {
     if (width_ < 0)
       width_ = 0;
     if (height_ < 0)
       height_ = 0;
   }
 
  protected:
   SizeBase(Type width, Type height)
       : width_(width),
         height_(height) {}
 
   // Destructor is intentionally made non virtual and protected.
   // Do not make this public.
   ~SizeBase() {}
 
  private:
   Type width_;
   Type height_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_SIZE_BASE_H_