2f5b93fb9f
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18951 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
379 lines
14 KiB
Plaintext
379 lines
14 KiB
Plaintext
XRC resources format specification
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==================================
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!!!!! NOT YET FINISHED !!!!!
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0. Introduction
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===============
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This note describes the file format used for storing XRC resources that are
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used by wxXmlResource class. It is probably only useful for those implementing
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dialog editors with XRC support.
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If you only want to use the resources, you can choose from a number of editors:
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a) wxDesigner (http://www.roebling.de)
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b) XRCed (wxPython/tools)
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c) wxWorkshop (http://wxworkshop.sf.net)
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b) wxrcedit (contrib/utils/wxrcedit)
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The XRC format is based on XML 1.0 (please consult W3C's specification). There
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is no DTD available since it is not possible to fully describe the format with
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the limited expressive power of DTDs.
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1. Terminology
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==============
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The usual XML terminology applies. In particular, we shall use the terms
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NODE, PROPERTY and VALUE in the XML sense:
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<node property1="value1" property2="value2">...</node>
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The term ATTRIBUTE is specific to XRC and refers to a subnode
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of an <object> or <object_ref> node that is itself not <object> or <object_ref>.
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In the example bellow, <pos>, <label> and <style> are attributes, while neither
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<resource> nor either of <object>s is:
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<?xml version="1.0" encoding="utf-8">
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<resource xmlns="http://www.wxwindows.org/wxxrc" version="2.3.0.1">
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<object class="wxPanel">
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<style>wxSUNKEN_BORDER</style> <!-- attr -->
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<object class="wxStaticText">
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<label>A label</label> <!-- attr -->
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<pos>10,10</pos> <!-- attr -->
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</object>
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</object>
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</resource>
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ATTRIBUTE VALUE is the content of all text elements within attribute tag. In the
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above example, "wxSUNKEN_BORDER", "A label" and "10,10" are attribute values.
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ATTRIBUTE TYPE defines what attribute values are valid for given attribute (you
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can think of it as attribute value syntax definition).
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2. Elementary description
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=========================
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XRC resource file is a well-formed XML 1.0 document. All elements of XRC file
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are from the http://www.wxwindows.org/wxxrc namespace.
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The root node of XRC document must be <resource>. The <resource> node has
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optional "version" property. Default version (in absence of the version
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property) is "0.0.0.0". The version consists of four integers separated by
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periods. Version of XRC format changes only if there was an incompatible
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change introduced (i.e. either the library cannot understand old resource
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files or older versions of the library wouldn't understand the new format).
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The first three integers are major, minor and release number of the wxWindows
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release when the change was introduced, the last one is revision number and
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is 0 for the first incompatible change in given wxWindows release, 1 for
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the second etc.
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Differences between versions are described within this document in paragraphs
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entitled "Version Note".
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The <resource> node contains namespace declaration, too:
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<resource xmlns="http://www.wxwindows.org/wxxrc" version="2.3.0.1">
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The <resource> node is only allowed to have <object> and <object_ref>
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subnodes, all of which must have the "name" property.
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The <object> node represents a single object (GUI element) and it usually maps
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directly to a wxWindows class instance. It three properties: "name", "class"
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and "subclass". "class" must always be present, it tells XRC what wxWindows
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object should be created in this place. The other two are optional. "name" is
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ID used to identify the object. It is the value passed to the XRCID() macro and
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is also used to construct wxWindow's id and name attributes and must be unique
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among all children of the neareset container object (wxDialog, wxFrame,
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wxPanel, wxNotebook) upside from the object in XML nodes hiearchy (two distinct
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containers may contain objects with same "name", though). "subclass" is
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optional name of class whose constructor will be called instead of the
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constructor for "class". Subclass must be available in the program that loads
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the resource, must be derived from "class" and must be registered within
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wxWindows' RTTI system.
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Example:
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<object name="MyList1" class="wxListCtrl" subclass="MyListCtrlClass">
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...
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</object>
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<object> node may have arbitrary child nodes. What child nodes and their
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semantics are class-dependent and are defined later in this document. The user
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is allowed to register new object handlers within XRC and extend it to accept
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new <object> classes (and therefore different <object>'s child nodes).
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<object_ref> node is identical to <object>, except that it does _not_ have
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"class" property and has additonal required property "ref". It's concept is
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similar to Unix symlinks: value of the "ref" property is equal to the value of
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"name" property of some existing node (called referred node) in the resources
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(not neccessary top-level). Referred node's "class" property and all subnodes
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are copied in place of the referee <object_ref> node which is then processed as
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regular <object> node. If the <object_ref> node itself has child nodes, then
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these nodes _override_ any nodes from the referred node.
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Example:
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<object name="foo" class="wxTextCtrl">
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<value>hello</value>
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<size>100,-1d</size>
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</object>
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<object_ref name="bar" ref="foo">
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<value>bar</value> <!-- override! -->
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</object_ref>
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is identical to:
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<object name="foo" class="wxTextCtrl">
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<value>hello</value>
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<size>100,-1d</size>
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</object>
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<object name="bar" class="wxTextCtrl">
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<value>bar</value>
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<size>100,-1d</size>
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</object>
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3. Common attribute types
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=========================
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There are several attribute types (see section 1. Terminology) that are common
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to many attributes of different classes:
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String
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------
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Any text. Some characters have special interpretation and are translated
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by XRC parser according to this table:
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"_" -> "&" ('&' is used to underline e.g. menu items in wxWindows)
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"__" -> "_"
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"\n" -> line break (C character '\n')
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"\r" -> carriage return (C character '\r')
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"\t" -> tabelator (C character '\t')
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Version Note:
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'$' was used instead of '_' prior to version 2.3.0.1.
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I18nString
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----------
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Like String, but the value is translated to native language using wxLocale
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at runtime (unless it was disabled by not passing wxXRC_USE_LOCALE flag to
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wxXmlResource constructor). Used for strings that are "visible" in the GUI.
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UnsignedInteger
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---------------
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This is obvious. Only digits 0-9 may be present and there must be at least
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one digit.
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Integer
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-------
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Like UnsignedInteger but may be prefixed with '-' (ints less than zero).
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Position
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--------
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Specifies (window's) position in 2D space. Syntax is <integer>,<integer>[d]
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where <integer> is valid value of Integer type.
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Size
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----
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Syntax is same as Position's syntax, but the values are interpreted as window
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size (wxSize type) and not position (wxPosition type).
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Style[wxSomeClass]
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------------------
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List of style flags that can be passed to wxSomeClass' constructor. Flags are
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written in same way as in C++ code (e.g. "wxSUNKEN_BORDER",
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"wxHW_SCROLLBAR_NEVER") and are delimined with any combination of whitespaces
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and '|'. Possible flags are class-dependent and are not described in this
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technote. Please refer to wxWindows manual for all styles that given class can
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accept; if XRC does not accept a flag listed in wxWindows documentation, it is
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a bug.
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Bitmap
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------
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Attribute value is interpreted as filename (either absolute or relative to
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the location of XRC resource file). In addition, attribute node may have
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"stock_id" and "stock_client" properties. Their values may be any of wxArtID (or
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wxArtClient respectively) values as used by wxArtProvider (because the user may
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define own constants, efectively any string is legal here). Examples are
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"wxART_FILE_OPEN" (id) or "wxART_MENU" (client).
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Any of "stock_id" or "stock_client" properties or the filename may be omitted.
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XRC determines the bitmap to use according to this algorithm:
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1. If there is non-empty "stock_id" property, query wxArtProvider for the
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bitmap (if there is no "stock_client", use default one, which is usually
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wxART_OTHER; exceptions are noted in class-specific sections bellow). If
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the query fails, continue to 2.
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2. Load the bitmap from the file in attribute value.
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Boolean
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-------
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Boolean value, either "0" (false) or "1" (true).
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4. Supported classes
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====================
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Attributes are listed in tables in the following format:
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attribute name attribute type default value, if any
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[(optional remarks....................
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...................................)]
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wxBitmap
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--------
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This is a special case, because it does not create a wxWindow instance but
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creates wxBitmap instead. Another exceptional thing is that it does not have
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any attributes. Instead, the node itself is interpreted as if it were attribute
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of type Bitmap.
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Example: <object class="wxBitmap">bitmaps/foo.gif</object>
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wxIcon
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------
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Identical to wxBitmap class, except that it creates wxIcon instead of wxBitmap.
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wxButton
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--------
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position Position -1,-1
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size Size -1,-1
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style Style[wxButton]
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label I18nString
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default Boolean false
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(Is the button default button?)
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wxCalendarCtrl
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--------------
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position Position -1,-1
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size Size -1,-1
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style Style[wxCalendarCtrl]
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wxCheckBox
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----------
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position Position -1,-1
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size Size -1,-1
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style Style[wxCheckBox]
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checked Boolean false
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wxCheckList
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-----------
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position Position -1,-1
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size Size -1,-1
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style Style[wxCheckList]
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content (see bellow) (empty)
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Optional "content" attribute does not have attribute value. Instead,
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arbitrary number of <item> nodes may be rooted under it (the control
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is filled with strings contained in these nodes). Each <item>
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node must contain I18nString value and may have "checked" property
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with possible values "0" or "1" indicating the the item is initially
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checked.
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Example:
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<object class="wxCheckList">
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<content>
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<item>One</item>
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<item checked="1">Two</item>
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<item checked="1">Three</item>
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<item>Four</item>
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</content>
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</object>
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wxScrolledWindow
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----------------
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position Position -1,-1
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size Size -1,-1
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style Style[wxScrolledWindow] wxHSCROLL | wxVSCROLL
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wxSplitterWindow
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----------------
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position Position -1,-1
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size Size -1,-1
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style Style[wxSplitterWindow] wxSP_3D
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sashpos Integer 0
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(Initial sash position)
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minsize Integer -1
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(Minimal panel size)
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orientation "horizontal"|"vertical" horizontal
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wxSplitterWindow must have at least one and at most two children objects.
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If there's only one child object, it is passed to wxSplitterWindow::Initialize
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and the splitter is created unsplitted. If there are two children, the
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splitter is created splitted, either horizontally or vertically depending
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on the value of "orientation" attribute.
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wxToolBar
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---------
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position Position -1,-1
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size Size -1,-1
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style Style[wxToolBar] wxNO_BORDER|wxTB_HORIZONTAL
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bitmapsize Size -1,-1
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(Size of contained bitmaps)
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margins Size -1,-1
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packing Integer -1
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separation Integer -1
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wxToolBar node may have children <object> and <object_ref> nodes. Their class
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may be either "tool", "separator" or any wxWindows class derived from
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wxControl. "tool" and "separator" are special pseudo-classes that may only
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appear within wxToolBar node. Their attributes are as follows:
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separator
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---------
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(doesn't have any attributes)
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tool
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----
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bitmap Bitmap
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bitmap2 Bitmap wxNullBitmap
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toggle Boolean 0
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radio Boolean 0
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label I18nString ""
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tooltip I18nString ""
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longhelp I18nString ""
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position Position -1,-1
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Constraints:
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At most one of "toggle" and "radio" attributes may be 1.
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Attribute "position" may not appear if "label" or "radio" attributes
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are used or if parent wxToolBar's style contains wxTB_TEXT.
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Note:
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Use of "position" attribute is strongly discouraged, it is deprecated
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usage of wxToolBar and it is not supported by MSW and GTK
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implementations.
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Children objects are added to the toolbar using AddTool for "tool" class,
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AddSeparator for "separator" and AddControl for other classes.
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5. More features
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================
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FIXME -- "platform" property handling
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=== EOF ===
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Version: $Id$
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