/// <summary>
/// This describes how to launch the form etc.
/// </summary>
/// <param name="context"></param>
/// <param name="provider"></param>
/// <param name="value"></param>
/// <returns></returns>
public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
{
_context = context;
IWindowsFormsEditorService dialogProvider = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
SQLExpressionDialog dlgExpression = new SQLExpressionDialog();
string original = (string)value;
dlgExpression.Expression = (string)value;
// Try to find the Table
IFeatureCategory category = context.Instance as IFeatureCategory;
if (category != null)
{
IFeatureScheme scheme = category.GetParentItem() as IFeatureScheme;
if (scheme != null)
{
IFeatureLayer layer = scheme.GetParentItem() as IFeatureLayer;
if (layer != null)
{
dlgExpression.Table = layer.DataSet.DataTable;
}
}
else
{
IFeatureLayer layer = category.GetParentItem() as IFeatureLayer;
if (layer != null)
{
dlgExpression.Table = layer.DataSet.DataTable;
}
}
}
dlgExpression.ChangesApplied += DlgExpressionChangesApplied;
var result = dialogProvider.ShowDialog(dlgExpression);
dlgExpression.ChangesApplied -= DlgExpressionChangesApplied;
return(result != DialogResult.OK ? original : dlgExpression.Expression);
}
/// <summary>
/// Occurs when including legend items
/// </summary>
/// <param name="item"></param>
protected override void OnInclude(IFeatureCategory item)
{
item.SetParentItem(_scheme.AppearsInLegend ? _scheme : _scheme.GetParentItem());
base.OnInclude(item);
}
/// <summary>
/// Sets up the Table to work with the specified layer
/// </summary>
/// <param name="layer"></param>
public void Initialize(IFeatureLayer layer)
{
_original = layer.Symbology;
ILegendItem parent = _original.GetParentItem();
//_original.SetParentItem(null);
_newScheme = _original.Copy();
_source = layer.DataSet;
// _original.SetParentItem(parent); // Disconnect this from actually affecting the layers.
if(!layer.DataSet.AttributesPopulated)
{
if(layer.DataSet.NumRows() < 100000)
{
_source.FillAttributes(); // for small datasets, it is better to just load and cache it.
}
}
if(_source.AttributesPopulated)
{
_expressionDialog.Table = _source.DataTable;
}
else
{
_expressionDialog.AttributeSource = _source;
}
_schemeType = GetSchemeType(layer);
if (_schemeType != SymbolizerTypes.Polygon)
{
chkUseGradients.Visible = false;
angGradientAngle.Visible = false;
}
else
{
chkUseGradients.Visible = true;
angGradientAngle.Visible = true;
}
if (_schemeType == SymbolizerTypes.Point)
{
IPointScheme ps = _newScheme as IPointScheme;
if (ps != null)
{
IPointSymbolizer sym;
if (ps.Categories.Count == 0 || ps.Categories[0].Symbolizer == null)
{
sym = new PointSymbolizer();
}
else
{
sym = ps.Categories[0].Symbolizer;
}
_ignoreRefresh = true;
featureSizeRangeControl1.SizeRange = new FeatureSizeRange(sym,_newScheme.EditorSettings.StartSize , _newScheme.EditorSettings.EndSize);
featureSizeRangeControl1.Initialize(new SizeRangeEventArgs(_newScheme.EditorSettings.StartSize, _newScheme.EditorSettings.EndSize, sym, _newScheme.EditorSettings.UseSizeRange));
featureSizeRangeControl1.Scheme = ps;
featureSizeRangeControl1.Visible = true;
_ignoreRefresh = false;
}
}
else if (_schemeType == SymbolizerTypes.Line)
{
ILineScheme ls = _newScheme as ILineScheme;
if(ls != null)
{
ILineSymbolizer sym;
if(ls.Categories.Count == 0 || ls.Categories[0].Symbolizer == null)
{
sym = new LineSymbolizer();
}
else
{
sym = ls.Categories[0].Symbolizer;
}
_ignoreRefresh = true;
featureSizeRangeControl1.SizeRange = new FeatureSizeRange(sym, _newScheme.EditorSettings.StartSize, _newScheme.EditorSettings.EndSize);
featureSizeRangeControl1.Initialize(new SizeRangeEventArgs(_newScheme.EditorSettings.StartSize, _newScheme.EditorSettings.EndSize, sym, _newScheme.EditorSettings.UseSizeRange));
featureSizeRangeControl1.Scheme = ls;
featureSizeRangeControl1.Visible = true;
_ignoreRefresh = false;
}
}
else
{
featureSizeRangeControl1.Visible = false;
}
UpdateFields();
if (_newScheme.EditorSettings.ClassificationType != ClassificationTypes.Quantities) return;
nudCategoryCount.Enabled = true;
tabScheme.Visible = true;
dgvCategories.Height = 217;
UpdateStatistics(false, null);
}