text: /*
   * Copyright (c) 2016 - Qeo LLC
   *
   * The source code form of this Qeo Open Source Project component is subject
   * to the terms of the Clear BSD license.
   *
   * You can redistribute it and/or modify it under the terms of the Clear BSD
   * License (http://directory.fsf.org/wiki/License:ClearBSD). See LICENSE file
   * for more details.
   *
   * The Qeo Open Source Project also includes third party Open Source Software.
   * See LICENSE file for more details.
   */
  
  #import "CPTBorderedLayer.h"
  
  /// @file
  
  @class CPTLegend;
  @class CPTPlot;
  @class CPTTextStyle;
  
  /// @name Legend
  /// @{
  
  /** @brief Notification sent by plots to tell the legend it should redraw itself.
   *  @ingroup notification
   **/
  extern NSString *const CPTLegendNeedsRedrawForPlotNotification;
  
  /** @brief Notification sent by plots to tell the legend it should update its layout and redraw itself.
   *  @ingroup notification
   **/
  extern NSString *const CPTLegendNeedsLayoutForPlotNotification;
  
  /** @brief Notification sent by plots to tell the legend it should reload all legend entries.
   *  @ingroup notification
   **/
  extern NSString *const CPTLegendNeedsReloadEntriesForPlotNotification;
  
  /// @}
  
  /**
   *  @brief Legend delegate.
   **/
  @protocol CPTLegendDelegate<NSObject>
  
  @optional
  
  /// @name Drawing
  /// @{
  
  /** @brief @optional This method gives the delegate a chance to draw custom swatches for each legend entry.
   *
   *  The "swatch" is the graphical part of the legend entry, usually accompanied by a text title
   *  that will be drawn by the legend. Returning @NO will cause the legend to not draw the default
   *  legend graphics. It is then the delegate&rsquo;s responsibility to do this.
   *  @param legend The legend.
   *  @param idx The zero-based index of the legend entry for the given plot.
   *  @param plot The plot.
   *  @param rect The bounding rectangle to use when drawing the swatch.
   *  @param context The graphics context to draw into.
   *  @return @YES if the legend should draw the default swatch or @NO if the delegate handled the drawing.
   **/
  -(BOOL)legend:(CPTLegend *)legend shouldDrawSwatchAtIndex:(NSUInteger)idx forPlot:(CPTPlot *)plot inRect:(CGRect)rect inContext:(CGContextRef)context;
  
  /// @}
  
  /// @name Legend Entry Selection
  /// @{
  
  /** @brief @optional Informs the delegate that the swatch or label of a legend entry was
   *  @if MacOnly clicked. @endif
   *  @if iOSOnly touched. @endif
   *  @param legend The legend.
   *  @param plot The plot associated with the selected legend entry.
   *  @param idx The index of the
   *  @if MacOnly clicked legend entry. @endif
   *  @if iOSOnly touched legend entry. @endif
   **/
  -(void)legend:(CPTLegend *)legend legendEntryForPlot:(CPTPlot *)plot wasSelectedAtIndex:(NSUInteger)idx;
  
  /** @brief @optional Informs the delegate that the swatch or label of a legend entry was
   *  @if MacOnly clicked. @endif
   *  @if iOSOnly touched. @endif
   *  @param legend The legend.
   *  @param plot The plot associated with the selected legend entry.
   *  @param idx The index of the
   *  @if MacOnly clicked legend entry. @endif
   *  @if iOSOnly touched legend entry. @endif
   *  @param event The event that triggered the selection.
   **/
  -(void)legend:(CPTLegend *)legend legendEntryForPlot:(CPTPlot *)plot wasSelectedAtIndex:(NSUInteger)idx withEvent:(CPTNativeEvent *)event;
  
  /// @}
  
  @end
  
  #pragma mark -
  
  @interface CPTLegend : CPTBorderedLayer {
      @private
      NSMutableArray *plots;
      NSMutableArray *legendEntries;
      BOOL layoutChanged;
      CPTTextStyle *textStyle;
      CGSize swatchSize;
      CPTLineStyle *swatchBorderLineStyle;
      CGFloat swatchCornerRadius;
      CPTFill *swatchFill;
      NSUInteger numberOfRows;
      NSUInteger numberOfColumns;
      BOOL equalRows;
      BOOL equalColumns;
      NSArray *rowHeights;
      NSArray *rowHeightsThatFit;
      NSArray *columnWidths;
      NSArray *columnWidthsThatFit;
      CGFloat columnMargin;
      CGFloat rowMargin;
      CGFloat titleOffset;
  }
  
  /// @name Formatting
  /// @{
  @property (nonatomic, readwrite, copy) CPTTextStyle *textStyle;
  @property (nonatomic, readwrite, assign) CGSize swatchSize;
  @property (nonatomic, readwrite, copy) CPTLineStyle *swatchBorderLineStyle;
  @property (nonatomic, readwrite, assign) CGFloat swatchCornerRadius;
  @property (nonatomic, readwrite, copy) CPTFill *swatchFill;
  /// @}
  
  /// @name Layout
  /// @{
  @property (nonatomic, readonly, assign) BOOL layoutChanged;
  @property (nonatomic, readwrite, assign) NSUInteger numberOfRows;
  @property (nonatomic, readwrite, assign) NSUInteger numberOfColumns;
  @property (nonatomic, readwrite, assign) BOOL equalRows;
  @property (nonatomic, readwrite, assign) BOOL equalColumns;
  @property (nonatomic, readwrite, copy) NSArray *rowHeights;
  @property (nonatomic, readonly, retain) NSArray *rowHeightsThatFit;
  @property (nonatomic, readwrite, copy) NSArray *columnWidths;
  @property (nonatomic, readonly, retain) NSArray *columnWidthsThatFit;
  @property (nonatomic, readwrite, assign) CGFloat columnMargin;
  @property (nonatomic, readwrite, assign) CGFloat rowMargin;
  @property (nonatomic, readwrite, assign) CGFloat titleOffset;
  /// @}
  
  /// @name Factory Methods
  /// @{
  +(id)legendWithPlots:(NSArray *)newPlots;
  +(id)legendWithGraph:(CPTGraph *)graph;
  /// @}
  
  /// @name Initialization
  /// @{
  -(id)initWithPlots:(NSArray *)newPlots;
  -(id)initWithGraph:(CPTGraph *)graph;
  /// @}
  
  /// @name Plots
  /// @{
  -(NSArray *)allPlots;
  -(CPTPlot *)plotAtIndex:(NSUInteger)idx;
  -(CPTPlot *)plotWithIdentifier:(id<NSCopying>)identifier;
  
  -(void)addPlot:(CPTPlot *)plot;
  -(void)insertPlot:(CPTPlot *)plot atIndex:(NSUInteger)idx;
  -(void)removePlot:(CPTPlot *)plot;
  -(void)removePlotWithIdentifier:(id<NSCopying>)identifier;
  /// @}
  
  /// @name Layout
  /// @{
  -(void)setLayoutChanged;
  /// @}
  
  @end
  