class FlatlandTouchIntegrationTest_PartialScreenOverlappingViews_Class

This test creates a view tree of the form:

root_view

|

parent_view

/

\

// child_A child_B

Where the root and parent are full screen, and child_A and child_B are partial screen views with

some overlap in the middle. Child A is "A"bove child B, who is "B"elow.

Let width and height represent the display width and height. Consider the following diagram,

drawn mostly to scale.

There are two full screen views: root (context) and parent (target). For event streams 1, 2, and

4, the viewport is full screen. For #4 the viewport is full screen but scaled, see that part of

the code for more details.

The top-left point of A is (width / 4, height / 4). The top-left point of

B is (width/2, height/4).Both A and B have the same dimensions: [width / 2 x height x 2].

Partial screen views: A on the left, B on the right, with A and B overlapping in the middle.

-------------------------------------

|Root/Parent/Viewport |

| |

| ---------------------------|

| |A |

<AB

> | B|

| | | | |

| | | | |

| ---------------------------|

| |

| |

-------------------------------------

Diagram for event stream #3 with a transformed viewport (VP):

Top-left point of the viewport is the same as A's top-left point. Bottom-right point of the

viewport is context view's bottom-right point.

-------------------------------------

|Root/Parent |

| |

| ---------------------------|

| |A/VP |

<AB

>/VP| B/VP|

| | | | |

| | | | |

| |- - - - - - - - - - - - - |

| | |

| | Viewport|

-------------------------------------