Mig-infocom MiG Calendar Tutorial Manual de usuario descargar pdf (Pagina 10)

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• Manage a DateGrid object that contains the date to pixel

translations. The DateGrid object will be recreated when needed

and the DateArea is maintaining the information that should be

persistent, such as the primary dimension and selectable range.

• Managing the layout and paint process of everything that is visible

on the date area. This is done thorough installable Decorators.

There are decorators for painting the grid, activities, cell labels,

selection rubber band rectangle and so on. In all some 15 different

types of decorators is delivered with MiG Calendar.

• Manage a subscription of the activities that should be shown in the

DateArea. This includes checking for updates and taking the

appropriate action when it comes to the visual part.

The Grid and its GridRows

To map a point in time to a specific position on the screen a

DateGrid object is used. It doesn't matter if time progresses

horizontally or vertically, the same grid class is used. The primary and

secondary dimension (I.e. if time progresses horizontally and wraps

vertically, like text, or the other way around) is a property of the grid

object.

Grid and DateGrid

A Grid, which is the base class for DateGrid and contains the

actual cell handling methods, is always square (x * y). DateGrid

adds the functionality to map a point in time to a certain position within

the Grid.

GridRows

A GridRow contains information about one row, or grid line, in the

Grid. It can be either horizontal or vertical, though it doesn't contain

that information itself. The size and position of every row and grid line,

in both dimensions, is stored in these GridRows. The grid's rows can

be extremely flexibly sized. They can be absolute (pixels) or relative

(percentage of bounds).

GridSegments

GridSegments are used to describe the size attributes for one or a

group of rows. Remember that rows can be both horizontal or vertical.

A GridSegment can for instance describe something like this: 'Five

rows with a minimum size of 10 pixels, max 25 pixels but preferably

20% of the total size (weighted)'.

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Mig-infocom MiG Calendar Tutorial Manual de usuario Pagina 10