Restructuring to not need to read widget state from outer code

[nilshenrich]

Currently, the program is working with loops and recursion getting tree-item widget status and processing on it. As the tree-items are StatefulWidgets now, it's bad practice getting current state.\ Better set a trigger from outer code and let the widgets itself do the processing.

[nilshenrich]

First implement #44

[nilshenrich]

• For generating hash file: Let each item append to file content directly -> File growes dynamically
• For loading hash file: Read file line by line (async) and trigger event for each line containing the path, so each item can check if hash belongs to it
• For Updating comparison input:
  • Clear: trigger one event all items listen to
  • Set content: Belongs to "loading hash file"

[nilshenrich]

• For generating hash file: Let each item append to file content directly -> File growes dynamically

  • For loading hash file: Read file line by line (async) and trigger event for each line containing the path, so each item can check if hash belongs to it

  • For Updating comparison input:

    • Clear: trigger one event all items listen to
    • Set content: Belongs to "loading hash file"

Generating hash file: Beside the item itself, each folder should store the stream controller as well to trigger item to update hash file.\ Folder: Trigger all direct children consecutively to update hash file\ File: Open hash file from given path in append mode and add line

[nilshenrich]

Done with f5fb8fcd5244e998de1176ab4ec7491077ced2fe