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

ui/gfx/vector2d.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.
 
 // Defines a simple integer vector class.  This class is used to indicate a
 // distance in two dimensions between two points. Subtracting two points should
 // produce a vector, and adding a vector to a point produces the point at the
 // vector's distance from the original point.
 
 #ifndef UI_GFX_VECTOR2D_H_
@@ skipping 22 matching lines @@
   bool IsZero() const;
 
   // Add the components of the |other| vector to the current vector.
   void Add(const Vector2d& other);
   // Subtract the components of the |other| vector from the current vector.
   void Subtract(const Vector2d& other);
 
   void operator+=(const Vector2d& other) { Add(other); }
   void operator-=(const Vector2d& other) { Subtract(other); }
 
+  void ClampToMax(const Vector2d& max) {
+    x_ = x_ <= max.x_ ? x_ : max.x_;
+    y_ = y_ <= max.y_ ? y_ : max.y_;
+  }
+
+  void ClampToMin(const Vector2d& min) {
+    x_ = x_ >= min.x_ ? x_ : min.x_;
+    y_ = y_ >= min.y_ ? y_ : min.y_;
+  }
+
   // Gives the square of the diagonal length of the vector. Since this is
   // cheaper to compute than Length(), it is useful when you want to compare
   // relative lengths of different vectors without needing the actual lengths.
   int64 LengthSquared() const;
   // Gives the diagonal length of the vector.
   float Length() const;
 
   std::string ToString() const;
 
   operator Vector2dF() const { return Vector2dF(x_, y_); }
@@ skipping 19 matching lines @@
 
 inline Vector2d operator-(const Vector2d& lhs, const Vector2d& rhs) {
   Vector2d result = lhs;
   result.Add(-rhs);
   return result;
 }
 
 }  // namespace gfx
 
 #endif // UI_GFX_VECTOR2D_H_