| 32 | | ^(Describe your design here.)^ |
| | 32 | * First of all, create class VisibleArea - composition of ImmArea and visibility flag. It will be immutable, with only one constructor and getters for the area and the visibility value. It will be used for the layout purposes, to it should be in that package. |
| | 33 | * Split the anonymous SceneTextView from the HeadTextFrameView, since the class has become too large. |
| | 34 | * In the SceneTextView's TextViewFlow, except the method getAreas(), add getVisibleAreas(). It will get the areas from the chain and the visible() value of the corresponding frame, and construct a VisibleArea from both. Then the getAreas() method will use getVisibleAreas() to create a list of ImmArea-s. |
| | 35 | * In RootPageView, override the computeVisible() method so that it returns true when the view is current in its parent book view. According to the default implementation of BaseVisualElement.visible(), this will cause a frame view to be visible() only when its page is current. Note, that the BaseVisualElement's visibility is not the same as the frame model's visibility channel. |
| | 36 | * As a result, the getVisibleAreas() will collect information about available areas for a chain as well as information about the current areas - the ones that the user works with. |
| | 37 | * In HotAreaLayout, put a flag '''valid''' and create a constant HotAreaLayout.INVALID. It represents a layout with empty text and empty area. |
| | 38 | * Introduce HotLayoutStatus. This way the logic will know how to handle the current layout. A HotLayoutStatus is defined for a concrete HotTextLayout and given ImmHotText and a list of VisibleArea-s as follows: |
| | 39 | * INVALID, if any of these is true: |
| | 40 | * The given text is NOT the same as the layout's; |
| | 41 | * The ImmArea-s from the given list are not the same as the ImmAreas used for the layout; |
| | 42 | * Not all the area layouts before the last visible area in the HotTextLayout are HotAreaLayout.isValid(). |
| | 43 | * VALID, if: |
| | 44 | * The status is not INVALID, and |
| | 45 | * All the area layouts in the HotTextLayout are HotAreaLayout.isValid(). |
| | 46 | * PARTIALLY_VALID, if: |
| | 47 | * The status is not INVALID, |
| | 48 | * The status is not VALID. |
