Implement disambiguation popup

content/renderer/disambiguation_popup_helper_unittest.cc

+// 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.
+
+#include "content/renderer/disambiguation_popup_helper.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebRect.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebVector.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/size.h"
+#include "ui/gfx/size_conversions.h"
+
+// these constants are copied from the implementation class
+namespace {
+const float kDisambiguationPopupMaxScale = 5.0;
+const float kDisambiguationPopupMinScale = 2.0;
+} // unnamed namespace
+
+namespace content {
+
+class DisambiguationPopupHelperUnittest : public testing::Test {
+ public:
+  DisambiguationPopupHelperUnittest()
+      : kViewportSize_(640, 480) { }
+ protected:
+  const gfx::Size kViewportSize_;
+};
+
+TEST_F(DisambiguationPopupHelperUnittest, ClipByViewport) {
+  gfx::Rect tap_rect(1000, 1000, 10, 10);
+  WebKit::WebVector<WebKit::WebRect> target_rects(static_cast<size_t>(1));
+  target_rects[0] = gfx::Rect(-20, -20, 10, 10);
+
+  gfx::Rect zoom_rect;
+  float scale = DisambiguationPopupHelper::ComputeZoomAreaAndScaleFactor(
+      tap_rect, target_rects, kViewportSize_, &zoom_rect);
+
+  EXPECT_TRUE(gfx::Rect(kViewportSize_).Contains(zoom_rect));
+  EXPECT_LE(kDisambiguationPopupMinScale, scale);
+
+  gfx::Size scaled_size = ToCeiledSize(zoom_rect.size().Scale(scale));
+  EXPECT_TRUE(gfx::Rect(kViewportSize_).Contains(gfx::Rect(scaled_size)));
+}
+
+TEST_F(DisambiguationPopupHelperUnittest, MiniTarget) {
+  gfx::Rect tap_rect(-5, -5, 20, 20);
+  WebKit::WebVector<WebKit::WebRect> target_rects(static_cast<size_t>(1));
+  target_rects[0] = gfx::Rect(10, 10, 1, 1);
+
+  gfx::Rect zoom_rect;
+  float scale = DisambiguationPopupHelper::ComputeZoomAreaAndScaleFactor(
+      tap_rect, target_rects, kViewportSize_, &zoom_rect);
+
+  EXPECT_TRUE(gfx::Rect(kViewportSize_).Contains(zoom_rect));
+  EXPECT_EQ(kDisambiguationPopupMaxScale, scale);
+  EXPECT_TRUE(zoom_rect.Contains(target_rects[0]));
+
+  gfx::Size scaled_size = ToCeiledSize(zoom_rect.size().Scale(scale));
+  EXPECT_TRUE(gfx::Rect(kViewportSize_).Contains(gfx::Rect(scaled_size)));
+}
+
+TEST_F(DisambiguationPopupHelperUnittest, LongLinks) {
+  gfx::Rect tap_rect(10, 10, 20, 20);
+  WebKit::WebVector<WebKit::WebRect> target_rects(static_cast<size_t>(2));
+  target_rects[0] = gfx::Rect(15, 15, 1000, 5);
+  target_rects[1] = gfx::Rect(15, 25, 1000, 5);
+
+  gfx::Rect zoom_rect;
+  float scale = DisambiguationPopupHelper::ComputeZoomAreaAndScaleFactor(
+      tap_rect, target_rects, kViewportSize_, &zoom_rect);
+
+  EXPECT_TRUE(gfx::Rect(kViewportSize_).Contains(zoom_rect));
+  EXPECT_EQ(kDisambiguationPopupMaxScale, scale);
+  EXPECT_TRUE(zoom_rect.Contains(tap_rect));
+
+  gfx::Size scaled_size = ToCeiledSize(zoom_rect.size().Scale(scale));
+  EXPECT_TRUE(gfx::Rect(kViewportSize_).Contains(gfx::Rect(scaled_size)));
+}
+
+} // namespace content