Add gfx::Insets::ToString().

This will be useful for debugging views and views applications
(I needed this when I was debugging my views application).
Along the way, added tests for Insets.

TEST=added tests; app_unittests; try
BUG=none

Review URL: http://codereview.chromium.org/497004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@34650 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 90 insertions, 1 deletions

diff --git a/app/gfx/insets.cc b/app/gfx/insets.cc
new file mode 100644
index 0000000..7e3da0c
--- /dev/null
+++ b/app/gfx/insets.cc
@@ -0,0 +1,16 @@
+// Copyright (c) 2009 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.
+
+#include "app/gfx/insets.h"
+
+#include "base/string_util.h"
+
+namespace gfx {
+
+std::string Insets::ToString() const {
+  // Print members in the same order of the constructor parameters.
+  return StringPrintf("%d,%d,%d,%d", top_,  left_, bottom_, right_);
+}
+
+}  // namespace gfx
diff --git a/app/gfx/insets.h b/app/gfx/insets.h
index f5806ac..70b3683 100644
--- a/app/gfx/insets.h
+++ b/app/gfx/insets.h
@@ -11,6 +11,8 @@
 #include <gtk/gtkstyle.h>
 #endif
 
+#include <string>
+
 namespace gfx {
 
 //
@@ -76,6 +78,9 @@ class Insets {
     return *this;
   }
 
+  // Returns a string representation of the insets.
+  std::string ToString() const;
+
  private:
   int top_;
   int left_;
@@ -83,6 +88,6 @@ class Insets {
   int right_;
 };
 
-}  // namespace
+}  // namespace gfx
 
 #endif  // APP_GFX_INSETS_H_
diff --git a/app/gfx/insets_unittest.cc b/app/gfx/insets_unittest.cc
new file mode 100644
index 0000000..9430a09
--- /dev/null
+++ b/app/gfx/insets_unittest.cc
@@ -0,0 +1,68 @@
+// Copyright (c) 2009 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.
+
+#include "app/gfx/insets.h"
+
+#include <iostream>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(InsetsTest, InsetsDefault) {
+  gfx::Insets insets;
+  EXPECT_EQ(0, insets.top());
+  EXPECT_EQ(0, insets.left());
+  EXPECT_EQ(0, insets.bottom());
+  EXPECT_EQ(0, insets.right());
+  EXPECT_EQ(0, insets.width());
+  EXPECT_EQ(0, insets.height());
+  EXPECT_TRUE(insets.empty());
+}
+
+TEST(InsetsTest, Insets) {
+  gfx::Insets insets(1, 2, 3, 4);
+  EXPECT_EQ(1, insets.top());
+  EXPECT_EQ(2, insets.left());
+  EXPECT_EQ(3, insets.bottom());
+  EXPECT_EQ(4, insets.right());
+  EXPECT_EQ(6, insets.width());  // Left + right.
+  EXPECT_EQ(4, insets.height());  // Top + bottom.
+  EXPECT_FALSE(insets.empty());
+}
+
+TEST(InsetsTest, Set) {
+  gfx::Insets insets;
+  insets.Set(1, 2, 3, 4);
+  EXPECT_EQ(1, insets.top());
+  EXPECT_EQ(2, insets.left());
+  EXPECT_EQ(3, insets.bottom());
+  EXPECT_EQ(4, insets.right());
+}
+
+TEST(InsetsTest, Add) {
+  gfx::Insets insets;
+  insets.Set(1, 2, 3, 4);
+  insets += gfx::Insets(5, 6, 7, 8);
+  EXPECT_EQ(6, insets.top());
+  EXPECT_EQ(8, insets.left());
+  EXPECT_EQ(10, insets.bottom());
+  EXPECT_EQ(12, insets.right());
+}
+
+TEST(InsetsTest, Equality) {
+  gfx::Insets insets1;
+  insets1.Set(1, 2, 3, 4);
+  gfx::Insets insets2;
+  // Test operator== and operator!=.
+  EXPECT_FALSE(insets1 == insets2);
+  EXPECT_TRUE(insets1 != insets2);
+
+  insets2.Set(1, 2, 3, 4);
+  EXPECT_TRUE(insets1 == insets2);
+  EXPECT_FALSE(insets1 != insets2);
+}
+
+TEST(InsetsTest, ToString) {
+  gfx::Insets insets(1, 2, 3, 4);
+  EXPECT_EQ("1,2,3,4", insets.ToString());
+}