User Mode
Description
In user mode you can make changes to a Gantt chart by dragging the bars in the Gantt chart.
The Gantt chart offers several possible dragging operations on the bars (representing a task), but whether or not all of them are allowed depends on the type of Task Data that is used:
If you click and drag the right side of a bar, then you can change the length of the bar (task duration).
If you click and drag on the left side of a bar, then you can change both the start position and the length of a bar, while keeping the end position on the same place.
If you click and drag any other part of the bar, then you can move the bar to a new start position (horizontally or vertically) without changing its length.
All these dragging operations (except the vertical move) can also be applied on multiple selected bars.
Restrictions
Moving the start position of a bar is only allowed if the Start identifier is updatable.
Changing the length of a bar is only allowed if the Duration identifier is updatable.
Changing the vertical position of a bar is only allowed if the row index is NOT used in either the Start identifier or the Duration identifier.
Note
You can only change the value of an identifier if the Gantt chart is not read-only and if the identifier is in the set CurrentInputs, which generally means that the identifier should not have a definition.
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