Class: HierarchicalItem

• Inheritance
• Description
• Related information
• Instance protocol
  • accessing
  • private
  • protocol-displaying
  • queries
• Private classes

Inheritance:

   Object
   |
   +--AbstractHierarchicalItem
      |
      +--HierarchicalItem
         |
         +--Bookmark
         |
         +--HierarchicalFileList::HierarchicalFileItem
         |
         +--HierarchicalItem::Example
         |
         +--HierarchicalItemWithLabel
         |
         +--HierarchicalItemWithValue
         |
         +--Tools::ChangeList::ListEntry
         |
         +--Tools::HierarchicalChangesetDialog::Change
         |
         +--Tools::LintRuleList::ListEntry
         |
         +--Tools::ProfilerInfoItem
         |
         +--Tools::TestRunner2::ResultList::ListEntry
         |
         +--Tools::VisualProfilerCanvas::CallTreeItem
         |
         +--VersionDiffBrowser::ClassChangeSet

Package:

stx:libwidg2

Category:

Views-Support

Version:

rev: 1.117 date: 2017/07/14 09:45:14

user: cg

file: HierarchicalItem.st directory: libwidg2

module: stx stc-classLibrary: libwidg2

Author:

Claus Atzkern

Description:

Hierarchical Items are mostly like Models, but the list of
dependencies are kept by its HierarchicalList.
Instances of (subclasses of) me are used to build up hierarchical trees.
This class is usually subclassed, to add label, icon or value (reference to some info)
to the tree item.

[Instance variables:]
    parent      <Item, List or nil>         parent or my HierarchicalList.
    children    <Collection or nil>         list of children
    isExpanded  <Boolean>                   indicates whether the item is
                                            expanded or collapsed
    width       <Integer>                   cached width of displayed label
    height      <Integer>                   cached height of displayed label

Related information:

    HierarchicalList
    HierarchicalListView

Instance protocol:

 height

return the cached height

 height: something

set the cached height

 width

return the cached width

 width: something

set the cached width

 fetchChildren

should compute the list of children via the model.
Be aware, that the somewhat stupid 'optimization' of how the model is fetched may lead to
a O(n*log n) or even O(n^2) behavior here.
*** to optimize: redefine #model by subClass

 makeWidthAndHeightUnknown

 setExpanded: aBoolean

set expanded flag without any computation or notification

 heightOn: aGC

return the height of the receiver, if it is to be displayed on aGC

 widthOn: aGC

return the width of the receiver, if it is to be displayed on aGC

 isExpanded

returns true if the item is expanded

Private classes:

    Example