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Tools Overview

Essentially the diagramming tools are a way of encapsulating series of related events usually triggered by an explicit action from the user.

Let's take for example the selection of diagram items by dragging a selection rectangle. This action has three related events which always come as one and in the same chronological order - the mouse is pressed, the mouse is moved and then finally released. During this selection process you don't want to move the items or trigger any non-selection related action by the changes of the mouse. Because of this, we've designed the diagramming tools to be mutually exclusive. This means that at any moment only one tool is active. This logic is implemented by a ToolService, which manages the registered tools and switches them on or off. When a tool tells the service that it will handle the mouse events, the ToolService blocks the other tools until that tool has finished its handling.

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