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Low level drag machine
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gather mouse information
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manage event capture environment
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differentiate drag from click
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send update events
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handle cancellation events / messages
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look for mouse up
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send finish events
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Drag and drop system (one possible flavor)
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process drag update events
- display drag avatar
- display drop hints
- manage target selection
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post processing
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Resizing system (one possible flavor)
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process drag update events
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post processing