Transformable views: Use the transformation for points and events.

Added and updated API for converting points between views' coordinate systems,
taking transformations into consideration. This in turn gives us, for free,
transformation for located events (mouse events, touch events).

BUG=none
TEST=ViewTest.TransformEvent

Review URL: http://codereview.chromium.org/6534015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@75960 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 127 insertions, 0 deletions

diff --git a/views/view_unittest.cc b/views/view_unittest.cc
index 0d30b6c..74aadd5 100644
--- a/views/view_unittest.cc
+++ b/views/view_unittest.cc
@@ -1587,6 +1587,133 @@ TEST_F(ViewTest, TransformPaint) {
   widget->CloseNow();
 }
 
+TEST_F(ViewTest, TransformEvent) {
+  TestView* v1 = new TestView();
+  v1->SetBounds(0, 0, 500, 300);
+
+  TestView* v2 = new TestView();
+  v2->SetBounds(100, 100, 200, 100);
+
+  Widget* widget = CreateWidget();
+#if defined(OS_WIN)
+  WidgetWin* window_win = static_cast<WidgetWin*>(widget);
+  window_win->set_window_style(WS_OVERLAPPEDWINDOW);
+  window_win->Init(NULL, gfx::Rect(50, 50, 650, 650));
+#endif
+  RootView* root = widget->GetRootView();
+
+  root->AddChildView(v1);
+  v1->AddChildView(v2);
+
+  // At this moment, |v2| occupies (100, 100) to (300, 200) in |root|.
+
+  // Rotate |v1| counter-clockwise.
+  v1->SetRotation(-90.0);
+  v1->SetTranslateY(500);
+
+  // |v2| now occupies (100, 200) to (200, 400) in |root|.
+  v1->Reset();
+  v2->Reset();
+
+  MouseEvent pressed(ui::ET_MOUSE_PRESSED,
+                     110, 210,
+                     ui::EF_LEFT_BUTTON_DOWN);
+  root->OnMousePressed(pressed);
+  EXPECT_EQ(0, v1->last_mouse_event_type_);
+  EXPECT_EQ(ui::ET_MOUSE_PRESSED, v2->last_mouse_event_type_);
+  EXPECT_EQ(190, v2->location_.x());
+  EXPECT_EQ(10, v2->location_.y());
+
+  MouseEvent released(ui::ET_MOUSE_RELEASED, 0, 0, 0);
+  root->OnMouseReleased(released, false);
+
+  // Now rotate |v2| inside |v1| clockwise.
+  v2->SetRotation(90.0);
+  v2->SetTranslateX(100);
+
+  // Now, |v2| occupies (100, 100) to (200, 300) in |v1|, and (100, 300) to
+  // (300, 400) in |root|.
+
+  v1->Reset();
+  v2->Reset();
+
+  MouseEvent p2(ui::ET_MOUSE_PRESSED,
+                110, 320,
+                ui::EF_LEFT_BUTTON_DOWN);
+  root->OnMousePressed(p2);
+  EXPECT_EQ(0, v1->last_mouse_event_type_);
+  EXPECT_EQ(ui::ET_MOUSE_PRESSED, v2->last_mouse_event_type_);
+  EXPECT_EQ(10, v2->location_.x());
+  EXPECT_EQ(20, v2->location_.y());
+
+  root->OnMouseReleased(released, false);
+
+  v1->ResetTransform();
+  v2->ResetTransform();
+
+  TestView* v3 = new TestView();
+  v3->SetBounds(10, 10, 20, 30);
+  v2->AddChildView(v3);
+
+  // Rotate |v3| clockwise with respect to |v2|.
+  v3->SetRotation(90.0);
+  v3->SetTranslateX(30);
+
+  // Scale |v2| with respect to |v1| along both axis.
+  v2->SetScale(0.8, 0.5);
+
+  // |v3| occupies (108, 105) to (132, 115) in |root|.
+
+  v1->Reset();
+  v2->Reset();
+  v3->Reset();
+
+  MouseEvent p3(ui::ET_MOUSE_PRESSED,
+                112, 110,
+                ui::EF_LEFT_BUTTON_DOWN);
+  root->OnMousePressed(p3);
+
+  EXPECT_EQ(ui::ET_MOUSE_PRESSED, v3->last_mouse_event_type_);
+  EXPECT_EQ(10, v3->location_.x());
+  EXPECT_EQ(25, v3->location_.y());
+
+  root->OnMouseReleased(released, false);
+
+  v1->ResetTransform();
+  v2->ResetTransform();
+  v3->ResetTransform();
+
+  v1->Reset();
+  v2->Reset();
+  v3->Reset();
+
+  // Rotate |v3| clockwise with respect to |v2|, and scale it along both axis.
+  v3->SetRotation(90.0);
+  v3->SetTranslateX(30);
+  // Rotation sets some scaling transformation. Using SetScale would overwrite
+  // that and pollute the rotation. So combine the scaling with the existing
+  // transforamtion.
+  v3->ConcatScale(0.8, 0.5);
+
+  // Translate |v2| with respect to |v1|.
+  v2->SetTranslate(10, 10);
+
+  // |v3| now occupies (120, 120) to (144, 130) in |root|.
+
+  MouseEvent p4(ui::ET_MOUSE_PRESSED,
+                124, 125,
+                ui::EF_LEFT_BUTTON_DOWN);
+  root->OnMousePressed(p4);
+
+  EXPECT_EQ(ui::ET_MOUSE_PRESSED, v3->last_mouse_event_type_);
+  EXPECT_EQ(10, v3->location_.x());
+  EXPECT_EQ(25, v3->location_.y());
+
+  root->OnMouseReleased(released, false);
+
+  widget->CloseNow();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // OnVisibleBoundsChanged()