Adjust maximum scroll bounds on FrameView to account for top controls. (Blink-side)

Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
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 using namespace blink;
 
 const int touchPointPadding = 32;
 
 #define EXPECT_EQ_RECT(a, b) \
     EXPECT_EQ(a.x(), b.x()); \
     EXPECT_EQ(a.y(), b.y()); \
     EXPECT_EQ(a.width(), b.width()); \
     EXPECT_EQ(a.height(), b.height());
 
+#define EXPECT_EQ_POINT(a, b) \
+    EXPECT_EQ(a.x(), b.x()); \
+    EXPECT_EQ(a.y(), b.y());
+
 class FakeCompositingWebViewClient : public FrameTestHelpers::TestWebViewClient {
 public:
     virtual bool enterFullScreen() OVERRIDE { return true; }
 };
 
 class WebFrameTest : public testing::Test {
 protected:
     WebFrameTest()
         : m_baseURL("http://www.test.com/")
         , m_chromeURL("chrome://")
@@ skipping 5589 matching lines @@
     FrameTestHelpers::WebViewHelper webViewHelper;
     webViewHelper.initializeAndLoad("about:blank");
 
     FrameView* frameView = webViewHelper.webViewImpl()->mainFrameImpl()->frameView();
     frameView->setFrameRect(IntRect(0, 0, 200, 200));
     EXPECT_EQ_RECT(IntRect(0, 0, 200, 200), frameView->frameRect());
     frameView->setFrameRect(IntRect(100, 100, 200, 200));
     EXPECT_EQ_RECT(IntRect(100, 100, 200, 200), frameView->frameRect());
 }
 
+TEST_F(WebFrameTest, FrameViewScrollAccountsForTopControls)
+{
+    FrameTestHelpers::WebViewHelper webViewHelper;
+    webViewHelper.initializeAndLoad("about:blank");
+
+    WebViewImpl* webView = webViewHelper.webViewImpl();
+    FrameView* frameView = webViewHelper.webViewImpl()->mainFrameImpl()->frameView();
+
+    webView->setTopControlsLayoutHeight(0);
+    webView->resize(WebSize(100, 100));
+    webView->setPageScaleFactor(2.0f);
+    webView->layout();
+
+    webView->setMainFrameScrollOffset(WebPoint(20, 100));
+    EXPECT_EQ_POINT(IntPoint(20, 50), IntPoint(frameView->scrollOffset()));
+
+    // Simulate the top controls showing by 20px, thus shrinking the viewport
+    // and allowing it to scroll an additional 10px (since we're 2X zoomed).
+    webView->applyViewportDeltas(WebSize(0, 0), 1.0f, 20.0f);
+    EXPECT_EQ_POINT(IntPoint(50, 60), frameView->maximumScrollPosition());
+
+    // Show more, make sure the scroll actually gets clamped. Horizontal
+    // direction shouldn't be affected.
+    webView->applyViewportDeltas(WebSize(0, 0), 1.0f, 20.0f);
+    webView->setMainFrameScrollOffset(WebPoint(100, 100));
+    EXPECT_EQ_POINT(IntPoint(50, 70), IntPoint(frameView->scrollOffset()));
+
+    // Hide until there's 10px showing.
+    webView->applyViewportDeltas(WebSize(0, 0), 1.0f, -30.0f);
+    EXPECT_EQ_POINT(IntPoint(50, 55), frameView->maximumScrollPosition());
+
+    // Simulate a RenderWidget::resize. The frame is resized to accomodate
+    // the top controls and Blink's view of the top controls matches that of
+    // the CC
+    webView->setTopControlsLayoutHeight(10.0f);
+    webView->resize(WebSize(100, 90));
+    webView->layout();
+    EXPECT_EQ_POINT(IntPoint(50, 45), frameView->maximumScrollPosition());
+
+    // Now simulate hiding.
+    webView->applyViewportDeltas(WebSize(0, 0), 1.0f, -10.0f);
+    EXPECT_EQ_POINT(IntPoint(50, 40), frameView->maximumScrollPosition());
+}
+
 TEST_F(WebFrameTest, FullscreenLayerNonScrollable)
 {
     FakeCompositingWebViewClient client;
     registerMockedHttpURLLoad("fullscreen_div.html");
     FrameTestHelpers::WebViewHelper webViewHelper;
     int viewportWidth = 640;
     int viewportHeight = 480;
     WebViewImpl* webViewImpl = webViewHelper.initializeAndLoad(m_baseURL + "fullscreen_div.html", true, 0, &client, &configueCompositingWebView);
     webViewImpl->resize(WebSize(viewportWidth, viewportHeight));
     webViewImpl->layout();
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     EXPECT_EQ(1u, frameClient.navigationalDataReceivedCount());
 
     // Neither should a page reload.
     localFrame->reload();
     EXPECT_EQ(4u, frameClient.provisionalLoadCount());
     EXPECT_FALSE(frameClient.wasLastProvisionalLoadATransition());
     EXPECT_EQ(1u, frameClient.navigationalDataReceivedCount());
 }
 
 } // namespace