SLD editor UI components

This folder contains WPF UserControls and ViewModels for creating and editing OGC SLD 1.0.0 styles.

Overview

The SLD Editor provides a comprehensive user interface for defining and modifying SLD specifications with support for:

Point, Line, Polygon, Text, and Raster symbolizers
Editable single-condition OGC filters for rule-based styling
Scale-dependent rendering (min/max scale denominators)
Color pickers and property editors
Live XML preview and Import/Export of SLD XML files

Namespaces: views live in IRI.Maptor.Presentation.Wpf.Controls.Symbology.Sld; view-models live in IRI.Maptor.Presentation.Wpf.ViewModels.Symbology.

Components

ViewModels (`ViewModels/Symbology/Sld/`, namespace `IRI.Maptor.Presentation.Wpf.ViewModels.Symbology`)

Core ViewModels

SldEditorViewModel - Main ViewModel managing the entire SLD document
- Manages layer name, style name, title, and abstract
- Contains collection of RuleViewModel
- Provides import/export functionality
- Commands: AddRuleCommand, RemoveRuleCommand, MoveRuleUpCommand, MoveRuleDownCommand
RuleViewModel - Represents a single SLD Rule
- Properties: Name, Title, Abstract
- Scale range: MinScale, MaxScale
- Filter support: HasFilter, FilterPropertyName, FilterOperator, FilterValue, FilterDescription
- Contains collection of symbolizers
- Commands for adding/removing symbolizers

Symbolizer ViewModels

All inherit from SymbolizerViewModelBase:

PointSymbolizerViewModel
- Well-known marks (circle, square, triangle, star, cross, x)
- Fill color and opacity
- Stroke color, width, and opacity
- Size and rotation
LineSymbolizerViewModel
- Stroke color, width, and opacity
- Line cap (butt, round, square)
- Line join (mitre, round, bevel)
- Dash array and dash offset
PolygonSymbolizerViewModel
- Fill color and opacity
- Stroke color, width, and opacity
- Line cap and line join
TextSymbolizerViewModel
- Label property name
- Font family, size, style (normal, italic, oblique), and weight (normal, bold)
- Font color
- Optional halo (outline) with radius, color, and opacity
RasterSymbolizerViewModel
- Raster opacity
- Editable color map (color, quantity, label, per-entry opacity)

Views (`Views/Symbology/Sld/`)

Main views

SldEditorView - Main composite view showing the full editor
- Style information panel (layer name, style name, title, abstract)
- Rules list with toolbar
- Tabbed interface for rule properties and symbolizers
- Live XML preview (regenerated when the tab is opened or refreshed)
SldEditorWindow - Standalone window wrapping SldEditorView
- Toolbar with import/export buttons
- Status bar showing rule count and selection

Symbolizer editors

PointSymbolizerView - Edit point symbolizer properties
LineSymbolizerView - Edit line symbolizer properties
PolygonSymbolizerView - Edit polygon symbolizer properties
TextSymbolizerView - Edit text symbolizer properties (with scrolling support)
RasterSymbolizerView - Edit raster opacity and color-map entries

Supporting views

ScaleRangeEditorView - Edit min/max scale denominators
SimpleFilterEditorView - Editable single-condition filter (property / operator / value)

Utilities

SymbolizerDataTemplateSelector - Selects appropriate view based on symbolizer type

Usage examples

Basic usage - standalone window

using IRI.Maptor.Presentation.Wpf.Controls.Symbology.Sld;   // Views (SldEditorWindow, SldEditorView, ...)
using IRI.Maptor.Presentation.Wpf.ViewModels.Symbology; // ViewModels (SldEditorViewModel, ...)

// Create and show the SLD editor window
var editor = new SldEditorWindow();
editor.Show();

Programmatic SLD creation

using IRI.Maptor.Presentation.Wpf.ViewModels.Symbology;
using IRI.Maptor.Core.Ogc.SLD;

// Create a new SLD editor
var editor = new SldEditorViewModel
{
    LayerName = "MyLayer",
    StyleName = "default",
    StyleTitle = "My Custom Style"
};

// Add a rule with a point symbolizer
var rule = new RuleViewModel
{
    Name = "Cities",
    Title = "City Markers"
};

var pointSymbolizer = new PointSymbolizerViewModel
{
    WellKnownMarkType = WellKnownMark.circle,
    Size = 10,
    FillColor = Colors.Red,
    StrokeColor = Colors.Black,
    StrokeWidth = 1
};

rule.Symbolizers.Add(pointSymbolizer);
editor.Rules.Add(rule);

// Export to SLD XML
var sld = editor.ToStyledLayerDescriptor();

Loading existing SLD

using System.IO;
using IRI.Maptor.Core.Ogc.SLD;

// Deserialize existing SLD
StyledLayerDescriptor? sld = SldHelper.Parse(File.ReadAllText("style.sld"));

// Load into editor
var editor = new SldEditorViewModel();
if (sld != null)
    editor.FromStyledLayerDescriptor(sld);

// Show in window
var window = new SldEditorWindow(editor);
window.Show();

Embedding in your application

<!-- In your XAML -->
<Window xmlns:sld="clr-namespace:IRI.Maptor.Presentation.Wpf.Controls.Symbology.Sld">
    <Grid>
        <sld:SldEditorView DataContext="{Binding YourSldEditorViewModel}"/>
    </Grid>
</Window>

Features

Supported symbolizers

PointSymbolizer

Well-known marks with fill and stroke
Size and rotation
Opacity control

LineSymbolizer

Stroke properties (color, width, opacity)
Line caps and joins
Dash patterns

PolygonSymbolizer

Fill and stroke properties
Line caps and joins

TextSymbolizer

Font properties (family, size, style, weight)
Text color
Halo effect (radius, color, opacity) for better readability

RasterSymbolizer

Raster opacity
Editable color map (color, quantity, label, per-entry opacity)

Rule features

Scale-dependent rendering (min/max scale denominators)
Editable single-condition OGC filter (property / operator / value); more complex loaded filters are preserved on round-trip
Multiple symbolizers per rule
Rule ordering (move up/down)

File operations

Export to SLD XML file (via SldHelper.Save)
Import from SLD XML file (via SldHelper.Parse)
Live XML preview (via SldHelper.Serialize)
Proper XML serialization with namespaces

Architecture

The components follow MVVM pattern:

ViewModels inherit from Notifier base class (implements INotifyPropertyChanged)
Views are UserControls with no code-behind logic (except constructor)
Data binding for all properties
Commands using RelayCommand from IRI.Maptor.Presentation.Wpf
Template selectors for dynamic view selection

Dependencies

IRI.Maptor.Core.Ogc - SLD data model
IRI.Maptor.Presentation.Wpf - Base classes and utilities
MahApps.Metro - UI controls (ColorPicker, NumericUpDown, etc.)
MahApps.Metro.IconPacks.Modern - Icons

Future enhancements

Potential improvements:

Advanced filter builder UI (nested AND/OR, spatial/like/between operators)
Label placement options editor
SLD validation and error reporting
Style preview/rendering
Import from other style formats
Style library/templates