MapGuide RFC 50 - Hide Legend Styles

This page contains an change request (RFC) for the MapGuide Open Source project. More MapGuide RFCs can be found on the RFCs page.

Status

RFC Template Version	(1.0)
Submission Date	June 27, 2008
Last Modified	Bruce Dechant Timestamp
Author	Aleck Sun
RFC Status	Draft
Implementation Status	pending
Proposed Milestone	2.1
Assigned PSC guide(s)	Bruce Dechant
Voting History	(vote date)
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Overview

Change the schema of LayerDefinition so that users can hide the styles that they don’t want to be displayed in the legend.

Motivation

Some feature classes can contain multiple feature types. For example, in SDF, a feature class can contain point, line, and polygon feature types. The current MapGuide legend displays all the geometry types regardless of whether there are features of that geometry type or not. Currently, there is a workaround that the user can delete the styles that they don't want to show in the legend. However, in this way, when the user wants to show them in the legend again, they may have forgetten which one was deleted. We would like to make it more flexible for the legend items to be shown. All the styles should be persisted and the user should be able to decide whether a style is going to be shown or not.

Proposed Solution

An additional tag is going to be added to the schema of LayerDefinition. We will add a <ShowInLegend> tag for LineTypeStyleType, AreaTypeStyleType and PointTypeStyleType as following. The version of the LayerDefinition will change from 1.2 to 1.3, i.e. LayerDefinition-1.3.0.xsd.

LineTypeStyle:

<xs:complexType name="LineTypeStyleType">
    <xs:annotation>
      <xs:documentation>Style specification of a line geometry type.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="LineRule" type="LineRuleType" maxOccurs="unbounded">
        <xs:annotation>
          <xs:documentation>Rules to define a theme.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="ShowInLegend" type="xs:boolean" minOccurs="0"/>
      <xs:element name="ExtendedData1" type="ExtendedDataType" minOccurs="0" />
    </xs:sequence>
</xs:complexType>

PointTypeStyle:

<xs:complexType name="PointTypeStyleType">
    <xs:annotation>
      <xs:documentation>Style specification of a point geometry type.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="DisplayAsText" type="xs:boolean">
        <xs:annotation>
          <xs:documentation>Create a text layer.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="AllowOverpost" type="xs:boolean">
        <xs:annotation>
          <xs:documentation>Allows labels from any map layer (including the current layer) to obscure features on the current layer.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="PointRule" type="PointRuleType" maxOccurs="unbounded">
        <xs:annotation>
          <xs:documentation>One or more PointRules defining the PointTypeStyle.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="ShowInLegend" type="xs:boolean" minOccurs="0"/>
      <xs:element name="ExtendedData1" type="ExtendedDataType" minOccurs="0" />
    </xs:sequence>
</xs:complexType>

AreaTypeStyle:

<xs:complexType name="AreaTypeStyleType">
    <xs:annotation>
      <xs:documentation>Style specification of a polygon geometry type.</xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name="AreaRule" type="AreaRuleType" maxOccurs="unbounded">
        <xs:annotation>
          <xs:documentation>Rules to define a theme.</xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name="ShowInLegend" type="xs:boolean" minOccurs="0"/>
      <xs:element name="ExtendedData1" type="ExtendedDataType" minOccurs="0" />
    </xs:sequence>
</xs:complexType>

Implications

The existing schema documentation will be updated.

Test Plan

No new unit tests will be created for this. However, the existing unit tests will be run to ensure that they still pass.

Funding/Resources

Autodesk