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-<?xml version="1.0" encoding="utf-8" ?>
-<!DOCTYPE erlref SYSTEM "erlref.dtd">
-
-<erlref>
- <header>
- <copyright>
- <year>2000</year>
- <year>2016</year>
- <holder>Ericsson AB, All Rights Reserved</holder>
- </copyright>
- <legalnotice>
- Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License.
- You may obtain a copy of the License at
-
- http://www.apache.org/licenses/LICENSE-2.0
-
- Unless required by applicable law or agreed to in writing, software
- distributed under the License is distributed on an "AS IS" BASIS,
- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- See the License for the specific language governing permissions and
- limitations under the License.
-
- The Initial Developer of the Original Code is Ericsson AB.
- </legalnotice>
-
- <title>gs</title>
- <prepared>Gunilla Hugosson</prepared>
- <docno></docno>
- <date></date>
- <rev></rev>
- </header>
- <module>gs</module>
- <modulesummary>The Graphics System for Erlang.</modulesummary>
- <description>
- <warning>
- <p>
- GS is not recommended for use in new applications.
- Instead we recommend WX for applications that need a
- graphical user interface.
- </p>
- <p>
- GS is deprecated and will be removed in the 18.0 release.
- </p>
- </warning>
- <p>The Graphics System, GS, is easy to learn and
- designed to be portable to many different platforms.</p>
- <p>In the description below, the type <c><![CDATA[gsobj()]]></c> denotes a
- reference to a graphical object created with GS. Such a reference
- is either a GS object identifier or the name of the object (an atom),
- if such a name exists.
- The functions all return the specified values or <c><![CDATA[{error,Reason}]]></c>
- if an error occurs.</p>
- <p>Please refer to the GS User's Guide for a description of
- the different object types and possible options.</p>
- </description>
- <funcs>
- <func>
- <name>config(GSObj, Options) -> ok</name>
- <fsummary>Configure a graphical object.</fsummary>
- <type>
- <v>GSOBj = gsobj()</v>
- <v>Options = [Option] | Option</v>
- <v>&nbsp;Option = {Key,Value}</v>
- </type>
- <desc>
- <p>Configures a graphical object according to the specified
- options.</p>
- </desc>
- </func>
- <func>
- <name>create(ObjType, Parent) -> ObjId</name>
- <name>create(ObjType, Parent, Options) -> ObjId</name>
- <name>create(ObjType, Name, Parent, Options) -> ObjId</name>
- <fsummary>Create a new graphical object.</fsummary>
- <type>
- <v>ObjType = atom()</v>
- <v>Parent = gsobj()</v>
- <v>Name = atom()</v>
- <v>Options = [Option] | Option</v>
- <v>&nbsp;Option = {Key,Value}</v>
- </type>
- <desc>
- <p>Creates a new graphical object of the specified type as a child
- to the specified parent object. The object is configured according
- to the options and its identifier is returned. If no options
- are provided, default option values are used.</p>
- <p>If a name is provided, this name can be used to reference
- the object instead of the object identifier. The name is local
- to the process which creates the object.</p>
- <p>The following object types exist: <c><![CDATA[window | button | radiobutton | checkbutton | label | frame | entry | listbox | canvas | arc | image | line | oval | polygon | rectangle | text | menubar | menubutton | menu | menuitem | grid | gridline | editor | scale]]></c></p>
- </desc>
- </func>
- <func>
- <name>create_tree(Parent, Tree) -> ok</name>
- <fsummary>Create a hierarchy of graphical objects.</fsummary>
- <type>
- <v>Parent = gsobj()</v>
- <v>Tree = [Object]</v>
- <v>&nbsp;Object = {ObjType,Options} | {ObjType,Options,Tree} | {ObjType,Name,Options,Tree}</v>
- </type>
- <desc>
- <p>Creates a hierarchy of graphical objects.</p>
- </desc>
- </func>
- <func>
- <name>destroy(GSObj) -> void()</name>
- <fsummary>Destroy a graphical object.</fsummary>
- <type>
- <v>GSObj = gsobj()</v>
- </type>
- <desc>
- <p>Destroys a graphical object and all its children.</p>
- </desc>
- </func>
- <func>
- <name>ObjType(Parent)</name>
- <name>ObjType(Parent, Options)</name>
- <name>ObjType(Name, Parent, Options)</name>
- <fsummary>Shorthand equivalents of <c><![CDATA[create]]></c>.</fsummary>
- <desc>
- <p>These functions are shorthand equivalents of <c><![CDATA[create/2]]></c>,
- <c><![CDATA[create/3]]></c>, and <c><![CDATA[create/4]]></c>, respectively.</p>
- </desc>
- </func>
- <func>
- <name>read(GSObj, Key) -> Value</name>
- <fsummary>Return the value of an object option.</fsummary>
- <type>
- <v>GSObj = gsobj()</v>
- <v>Key = atom()</v>
- <v>Value = term()</v>
- </type>
- <desc>
- <p>Returns the value of an option key for the specified graphical
- object.</p>
- </desc>
- </func>
- <func>
- <name>start() -> ObjId</name>
- <fsummary>Start GS.</fsummary>
- <desc>
- <p>Starts GS, unless it is already started, and returns its object
- identifier.</p>
- </desc>
- </func>
- <func>
- <name>stop() -> void()</name>
- <fsummary>Stop GS.</fsummary>
- <desc>
- <p>Stops GS and closes all windows. This function is not the opposite
- of <c><![CDATA[start/0]]></c> as it will cause <em>all</em> applications
- to lose their GS objects.</p>
- </desc>
- </func>
- </funcs>
-</erlref>
-