Treebrowser

The Treebrowser applet is an applet displaying a Windows Explorer looking structure. For an example please see. Below there are instructions how to configure the applet.

First the parameters in the applet tag are described and then the dat-file defining the tree structure is described.
Name Example Description

archive
(optional)

treebrowse.zip

To speed up the loading of the applet there are a file named treebrowse.zip.

wwwroot
(optional)

treebrowse

Defines where the dat-file and the pictures have their top directory. If this parameter is not defined wwwroot is set to the document base of the HTML document containing the applet tag. In most cases this parameter is not used.

datafile
(optional)

tree.dat

The name of the dat-file defining the structure of the tree. The default value "tree.dat".

For all parameters related to colors, the values and syntax, click here.

bgcolor
(optional)

white

Defines the background color of the Treebrowser. The default value is white.

bgimage
(optional)

bg.gif

The name of the image that shall be displayed as a background of the Treebrowser. If this parameter is missing the background is set to the value of the parameter "bgcolor".

fgcolor
(optional)

black

The color of the node labels. The default value is black.

selbgcolor
(optional)

0,0,255

The color of the rectangular are that surrounds the label text of the currently selected node. The default value is 0,0,255.

selfgcolor
(optional)

white

The color of the text for the selected node. The default value is white.

visitcolor
(optional)

255,51,51

The color of the text for the nodes whose html documents you have already read. The default value is 255,51,51.

visitoncemarkall
(optional)

true

If there are more than one node in the tree with the same URL this parameter specifies if all these nodes shall be marked visited as soon as one of them are visited. The default value is false.

mouseovercolor
(optional)

blue

The color of the text of the node the mouse is currently over. Only valid if the node has a related document. The default value is blue.

mouseovershadow
(optional)

true

Specifies if the node that the mouse is currently over shall show a tree-dimensional shadow of the node text. The default value is true.

target
(optional)

_top

The name of the HTML frame where the documents shall be shown if the dat-file does not specify any target for the node. The default value is _top.

scrollbartoleft
(optional)

false

Specifies if the horizontal scrollbar shall be to the left of the tree or not. The default value is false, i.e. it is to the right of the tree.

verticalincrement
(optional)

1

The number of nodes that shall be moved up or down when you click on the vertical scrollbar. The default value is 1. If the tree has very many nodes it can be a good idea to use this parameter to get the Treebrowser behave in a nice way.

horizontalincrement
(optional)

1

The number of positions the tree shall be moved sidewise when the horizontal scrollbar is clicked. The default value is 1

.

gc
(optional)

10

In java the memory allocation and de-allocation shall be handled automatically the runtime environment. This is however not done properly. This will cause the Treebrowser to consume to much memory. With this parameter you can specify how often the garbage collector shall be called. The number specifies how many times the tree shall be redrawn before the garbage collector is called. The default value is 10

.

maxvisiblenodes
(optional)

100

If you use the public method selectNode the tree may be automatically expanded. This may result in that very many nodes are visible. This parameter defines the maximum number of visible nodes. The default value is 100

.

cellsize
(optional)

16

The height in pixels each node in the tree occupies. The default value is 16. This is also the size of the pictures that can be used for each node. If the cellsize is set to 24 the maxsize of the picture is 24 x 24 pixels. The value have to be uneven.

Click here for details regarding the syntax and value of all parameters regarding fonts.

treefont
(optional)

Arial,PLAIN,12

Specifies the font of the node labels in the tree. The default value is Arial,PLAIN,12.

border
(optional)

false

Specifies if the tree shall be surrounded by a border. This parameter is only applicable if the tree is shown directly in the applet area. The default value is false.

frame
(optional)

false

Specifies if the tree shall be shown in an own window or in the applet area. If the tree is show in the applet area the following parameters are not applicable. If the tree is shown in an own window the size of the applet area can be made smaller. The default value is false.

framewidth
(optional)

250

Specifies the width of the separate window. The default value is 250.

frameheight
(optional)

400

Specifies the height of the separate window. The default value is 400.

frametitle
(optional)

Tree Browser

Specifies the title of the separate window. The default value is Tree Browser.

frameimage
(optional)

images/icon.gif

When the tree is shown in a separate window you can choose to display a text, a image or both in the applet area. Specify the image relative to the wwwroot or documentbase, for example "images/icon.gif". If the image can not be loaded the text specified by the parameter framelabel will be shown.

framelabel
(optional)

Tree Browser

Specify the text to be shown in the applet area when the tree is shown in a separate window. The default value is Tree Browser.

labelpos
(optional)

below

If both the parameters frameimage and framelabel are specified this parameter specifies where the text shall be written according to the image. Possible values are "right" and "below". The default value is below.

framelabelfont
(optional)

Arial,BOLD,12

Specifies the font of the text specified by the parameter framelabel. The default value is Arial,BOLD,12.

framelabelbgcolor
(optional)

white

Specifies the background color of the applet are when the tree is shown in a separate window. The default value is white.

images¤
0¤First node¤index.html¤Left¤BookClosed.gif¤BookOpen.gif¤false¤

images¤

The first row in the dat-file specifies the name of the directory where the images are located. The directory can be specified in three ways, relative the dat-file, as a complete URL or as an URL that begins with "/". The last alternative is to be used when to access the applet through a server.

The Treebrowser will make up to four tries to find the specified pictures.

First of all it will search the directory specified in the dat-file

The second alternative is to search the directory images below the dat-file.

The third alternative is to search the directory specified in the dat-file of a parent tree.

Finally it will search the directory images below the parent trees dat-file.

Each node in the tree specifies by one row in the dat-file. Each row consists of seven parts. Each part ends with a "¤". This results in that the "¤" character can not be used for anything else in the dat-file. The dat-file is not sensitive for space characters in the beginning and end of each part. They will be stripped by the program.

0¤

Specifies the level in the tree the node belongs. The first node has always the lowest value of this part. The child of a node have 1 level higher than its parent. If several nodes have the lowest value they will be siblings. No node is however allowed to have a lower value than the first one.

First node¤

The label of the first node. This text is the one that will be visible in the tree.

index.html¤

The URL of the file that shall be opened when you click on the node. If no file is connected to the node specify one or more space characters in this position. The URL can be an complete URL, for example http://www.ratinal.com. It can be relative the dat-file, for example ../index.html. An URL that is relative is always relative the directory where the dat-file is located.

If the URL begins with "/" then an URL that begins with the parts of the documentbase that is protocol, host and port followed by the text in the dat-file will be created. For example if the document root of the applet page is "http://www.ruptools.com:1100/applet/treebrowse.html" then "http://www.ruptools.com:1100" will be put before the text in the dat-file.

If you want to include another dat-file into your tree you specify a node as the only child of the parent node to the subtree. This dummy node will be replaced with the root node of the subtree. The URL to the dat-file is specified as the URL in the dummy node. The new dat-file have to have the suffix ".dat". The subtree is created when you click on its parent node and not at start up of the Treebrowser.

Left¤

The name of the Target/Frame in which this document is to be shown. The standard HTML target such as "_top" does work. If you want this document to be shown in the Target/Frame specified by the parameter "target" type one or more space characters here.

BookClosed.gif¤

This is the name of the image displayed when the node is closed. The image shall be of the size 16 x 16 pixels as long as you have not specified any other value of the parameter "cellsize" If the node do not have any image specify one or more space characters.

BookOpen.gif¤

This is the name of the image displayed when the node is closed. If the node do not have any image specify one or more space characters.

true¤

Specifies if the node shall be expanded or not when the tree is initially loaded. If the value is "true" the node will be expanded if it has some children. Every other value will make the node collapsed at startup. If the node does not have any child nodes or if the child node is a new dat-file this part is not of any importance.

Methodname Returns Description

isReady

Boolean

Return true if the Treebrowser is completely loaded, false if not. Until the Treebrowser is completely loaded the other methods are not able to proceed its services.

getParentUrl(String url)

String

This method takes the url of a node in the tree and returns the url of the parent node. If the url is not found in any node or if the node does not have any parent null is returned. For all the following methods the Treebrowser will start searching from the top node and down. If there are more than one node with the same url only the first one will be found.

getParentLabel(String url)

String

This method takes the url of a node in the tree and returns the label of the parent node. If the url is not found in any node or if the node does not have any parent null is returned.

getChildUrl(String url)

String

This method takes the url of a node in the tree and returns the url of the first child node. If the url is not found in any node or if the node does not have any child null is returned.

getChildLabel(String url)

String

This method takes the url of a node in the tree and returns the label of the first child node. If the url is not found in any node or if the node does not have any child null is returned.

getPreviousUrl(String url)

String

This method takes the url of a node in the tree and returns the url of the previous sibling node. If the url is not found in any node or if the node does not have any previous sibling null is returned.

getPreviousLabel(String url)

String

This method takes the url of a node in the tree and returns the label of the previous sibling node. If the url is not found in any node or if the node does not have any previous sibling null is returned.

getNextUrl(String url)

String

This method takes the url of a node in the tree and returns the url of the next sibling node. If the url is not found in any node or if the node does not have any next sibling null is returned.

getNextLabel(String url)

String

This method takes the url of a node in the tree and returns the label of the next sibling node. If the url is not found in any node or if the node does not have any next sibling null is returned.

selectNode(String url)

void

This method takes the url of a node in the tree and sets that node to be the selected one. If the node is not visible it will become visible. The tree may be collapsed if to many nodes are visible. The vertical scrollbar may also be affected.

 

Colors can be specified in three ways, the name of the color, the RGB-code in hexadecimal or the RGB code in decimal.

Below the different alternatives are described:

The name of the color
The following colors are supported, the value is not case sensitive.

  • black
  • blue
  • cyan
  • darkGray
  • gray
  • green
  • lightGray
  • magenta
  • orange
  • pink
  • red
  • white
  • yellow

The RGB code in hexadecimal base
A color can be defined with the RGB code written in hex, i.e. #FFaa16. If you specify it in hex then a "#" character must start the definition.

The RGB code in decimal base
A color can be defined in decimal RGB code, i.e. 255,255,255.

 

Font definition

Fonts are defined according to the syntax "name,style,size"

name can have the following none case insensitive values:

  • arial
  • courier
  • dialog
  • helvetica
  • symbol
  • timesroman

style some of the following case insensitive values:

  • bold
  • bolditalic
  • italic
  • plain.

size is an integer value.

 

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© Rational Software Corporation 1998 Rational Unified Process 5.1 (build 43)