NatTable/src/org/eclipse/nebula/widgets/nattable/core/layer/LayerInvariants.xtend

package org.eclipse.nebula.widgets.nattable.core.layer

import static extension org.eclipse.nebula.widgets.nattable.core.axis.AxisInvariants.*

/**
 * Utility class to efficiently calculate invariants that must hold for any given layer.
 */
class LayerInvariants {
	
	// Horizontal axis
	
	def static getStartXPixelOfColumnPosition(Layer layer, int columnPosition) {
		layer.horizontalAxis.getStartPixelOfSegmentPosition(columnPosition)
	}
	
	def static getPixelWidthOfColumn(Layer layer, int columnPosition) {
		layer.horizontalAxis.getPixelSizeOfSegment(columnPosition)
	}
	
	def static getPixelWidth(Layer layer) {
		layer.horizontalAxis.pixelSize
	}
	
	// Vertical axis
	
	def static getStartYPixelOfRowPosition(Layer layer, int rowPosition) {
		layer.verticalAxis.getStartPixelOfSegmentPosition(rowPosition)
	}
	
	def static getPixelHeightOfRow(Layer layer, int rowPosition) {
		layer.verticalAxis.getPixelSizeOfSegment(rowPosition)
	}
	
	def static getPixelHeight(Layer layer) {
		layer.verticalAxis.pixelSize
	}
	
	// Layer
	
	def static getCellPixelBounds(Layer layer, int columnPosition, int rowPosition) {
		return new PixelRectangle(
			layer.getStartXPixelOfColumnPosition(columnPosition),
			layer.getStartYPixelOfRowPosition(rowPosition),
			layer.getPixelWidthOfColumn(columnPosition),
			layer.getPixelHeightOfRow(rowPosition)
		)
	}
	
}