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Description:

diagram editor

diagram_editor #

Flutter diagram editor library for showing and editing diagrams of custom type. It provides DiagramEditor widget and a possibility to customize all editor design and behavior.

Demo App Example (example source code)
Getting Started #
Use of DiagramEditor widget:
DiagramEditor(
diagramEditorContext: DiagramEditorContext(
policySet: myPolicySet,
),
),
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myPolicySet is a class composed of mixins, for example:
class MyPolicySet extends PolicySet
with
MyInitPolicy,
CanvasControlPolicy,
LinkControlPolicy,
LinkJointControlPolicy,
LinkAttachmentRectPolicy {}
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MyInitpolicy can be following:
mixin MyInitPolicy implements InitPolicy {
@override
initializeDiagramEditor() {
canvasWriter.state.setCanvasColor(Colors.grey);
}
}
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For example in MyCanvasPolicy in function onCanvasTapUp(TapUpDetails details) a new component is added if no component is selected.
mixin MyCanvasPolicy implements CanvasPolicy, CustomPolicy {
@override
onCanvasTapUp(TapUpDetails details) async {
canvasWriter.model.hideAllLinkJoints();
if (selectedComponentId != null) {
hideComponentHighlight(selectedComponentId);
} else {
canvasWriter.model.addComponent(
ComponentData(
size: Size(96, 72),
position: canvasReader.state.fromCanvasCoordinates(details.localPosition),
data: MyComponentData(),
),
);
}
}
}
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There are several editor policies that can be implemented and added to the policy set:

InitPolicy
CanvasPolicy
ComponentPolicy
ComponentDesignPolicy
LinkPolicy
LinkJointPolicy
LinkAttachmentPolicy
LinkWidgetsPolicy
CanvasWidgetsPolicy
ComponentWidgetsPolicy

Some policies are already implemented and ready to use:

CanvasControlPolicy
LinkControlPolicy
LinkJointControlPolicy
LinkAttachmentRectPolicy

Possibilities of usage of individual policies are described in the documentation.
More in examples (links above).