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_config.php

@@ -2,5 +2,7 @@
 /**
  * This module allows you to choose a deposit ammount for an event payment.
  */
+
+Object::add_extension('Event','PayDepositPaymentFormDecorator');
 
 ?>

code/PayDepositPaymentFormDecorator.php

@@ -0,0 +1,58 @@
+<?php
+
+class PayDepositPaymentFormDecorator extends DataObjectDecorator{
+
+	function extraStatics(){
+		return array(
+			'db' => array(
+				'AllowPaymentModification' => 'Boolean',
+				'LowerLimitValue' => 'Currency',
+				'LowerLimitPercent' => 'Percentage'
+			)
+		);
+	}
+
+	function updateCMSFields(&$fields){
+
+		$fields->addFieldToTab('Root.Content.BookingOptions',new CheckboxField('AllowPaymentModification','Allow payments to be modified'));
+
+		if($this->owner->AllowPaymentModification){
+			$fields->addFieldsToTab('Root.Content.BookingOptions',
+				array(
+					new NumericField('LowerLimitPercent','Minimimum percentage of total that can be paid')
+					//new CurrencyField('LowerLimitValue','Lowest amount that can be paid (will override percent, if present)')
+				)
+			);			
+		}
+
+	}
+
+	function updatePaymentFields(&$fields){
+
+		if($this->owner->AllowPaymentModification && $afield = $fields->fieldByName('Amount')){
+			$value = $afield->Value();
+			$fields->replaceField('Amount',$lcf = new LimitedCurrencyField('Amount','Amount',$value));
+
+			$datavalue = $lcf->dataValue();
+			$lcf->setUpperLimit($datavalue); //can't pay more
+
+			if($this->owner->LowerLimitPercent > 0)	$lcf->setLowerLimit(ceil((double)$datavalue * (double)$this->owner->LowerLimitPercent));
+
+			//if($this->owner->LowerLimitValue) $lcf->setLowerLimit($this->owner->LowerLimitValue);
+
+			$lcf->setTitle($lcf->Title()." (deposit can be any amount ".$lcf->LabelExtra().")");
+		}
+	}
+
+	function onBeforePayment(&$registration,&$data,&$form){
+
+		$payment = $registration->Payment();
+		if($afield = $form->Fields()->fieldByName('Amount')){
+			$payment->Amount = $afield->Value();
+			$payment->write();		
+		}
+	}
+
+}
+
+?>

code/fields/LimitedCurrencyField.php

@@ -0,0 +1,55 @@
+<?php
+
+class LimitedCurrencyField extends CurrencyField{
+
+	private $upperlimit = null;
+	private $lowerlimit = null;
+
+	function setUpperLimit($limit){
+		$this->upperlimit = $this->convertTo($limit);
+	}
+
+	function setLowerLimit($limit = 0){
+		$this->lowerlimit = $this->convertTo($limit);
+	}
+
+	function validate($validator) {
+		if(!parent::validate($validator)) return false;
+
+		if($this->dataValue() > $this->convertFrom($this->upperlimit)) {
+			$validator->validationError($this->name, "Value must be below $this->upperlimit", "validation", false);
+			return false;
+		}
+
+		if($this->dataValue() < $this->convertFrom($this->lowerlimit)) {
+			$validator->validationError($this->name, "Value must be above $this->lowerlimit", "validation", false);
+			return false;
+		}
+
+		return true;
+	}
+
+	private function convertFrom($value){
+		if($value){
+			return preg_replace('/[^0-9.]/',"", $value);
+		}else{
+			return 0.00;
+		}
+	}
+
+	private function convertTo($value){
+		return '$' . number_format(ereg_replace('[^0-9.]',"",$value), 2);
+	}
+
+	public function LabelExtra(){
+		if($this->upperlimit && $this->lowerlimit)
+			return "between $this->lowerlimit and $this->upperlimit";
+		if($this->lowerlimit)
+			return "above $this->lowerlimit";
+		if($this->upperlimit)
+			return "below $this->upperlimit";
+		return null;
+	}
+}
+
+?>