Hello guys,
I have a trigger and I want to separate it into trigger and class. Please help.Thanks. Bellow is my trigger

trigger SumCalculation on House_Improvements__c (after insert,after update, after delete,after undelete) {
    List<id> PropertyIds = new List<id>();
    if(Trigger.isInsert || Trigger.isUndelete || Trigger.isupdate){
        For(House_Improvements__c himp1 : Trigger.new){
            PropertyIds.add(himp1.Property__c);
        }
    }
    if(Trigger.isDelete){
        For(House_Improvements__c  himp1 : Trigger.old){
            PropertyIds.add(himp1.Property__c);
        }
    }
    List<Property__c> PropertyToUpdate = new List<Property__c>();
   decimal sum;
    if(Trigger.isInsert || Trigger.isUndelete || Trigger.isupdate){
        For (Property__c q: [SELECT id,SUM_Calculations__c, (SELECT id, Price__c FROM House_Improvements__r) FROM Property__c WHERE id =:PropertyIds]){
            decimal sum=0;
            for(House_Improvements__c   p : q.House_Improvements__r)
                sum = sum + p.Price__c ;
            q.SUM_Calculations__c  = sum;
            PropertyToUpdate .add(q);
        }
        try{
            update PropertyToUpdate ;
        }Catch(Exception e){
            System.debug('Exception :'+e.getMessage());
        }
    }
    if(Trigger.isDelete){
        For(Property__c q : [SELECT SUM_Calculations__c ,(SELECT id,Price__c FROM House_Improvements__r) FROM Property__c WHERE id =: PropertyIds]){
            decimal sum = 0;
            for(House_Improvements__c  p : q.House_Improvements__r)
                sum = sum + p.Price__c ;
            q.SUM_Calculations__c  = sum;
           PropertyToUpdate .add(q);
        }
        try{
            update PropertyToUpdate ;
        }Catch(Exception e){
            System.debug('Exception :'+e.getMessage());
        }
    }
}

Hello guys,
I have a trigger and I want to separate it into trigger and class. Please help.Thanks. Bellow is my trigger

trigger SumCalculation on House_Improvements__c (after insert,after update, after delete,after undelete) {
    List<id> PropertyIds = new List<id>();
    if(Trigger.isInsert || Trigger.isUndelete || Trigger.isupdate){
        For(House_Improvements__c himp1 : Trigger.new){
            PropertyIds.add(himp1.Property__c);
        }
    }
    if(Trigger.isDelete){
        For(House_Improvements__c  himp1 : Trigger.old){
            PropertyIds.add(himp1.Property__c);
        }
    }
    List<Property__c> PropertyToUpdate = new List<Property__c>();
   decimal sum;
    if(Trigger.isInsert || Trigger.isUndelete || Trigger.isupdate){
        For (Property__c q: [SELECT id,SUM_Calculations__c, (SELECT id, Price__c FROM House_Improvements__r) FROM Property__c WHERE id =:PropertyIds]){
            decimal sum=0;
            for(House_Improvements__c   p : q.House_Improvements__r)
                sum = sum + p.Price__c ;
            q.SUM_Calculations__c  = sum;
            PropertyToUpdate .add(q);
        }
        try{
            update PropertyToUpdate ;
        }Catch(Exception e){
            System.debug('Exception :'+e.getMessage());
        }
    }
    if(Trigger.isDelete){
        For(Property__c q : [SELECT SUM_Calculations__c ,(SELECT id,Price__c FROM House_Improvements__r) FROM Property__c WHERE id =: PropertyIds]){
            decimal sum = 0;
            for(House_Improvements__c  p : q.House_Improvements__r)
                sum = sum + p.Price__c ;
            q.SUM_Calculations__c  = sum;
           PropertyToUpdate .add(q);
        }
        try{
            update PropertyToUpdate ;
        }Catch(Exception e){
            System.debug('Exception :'+e.getMessage());
        }
    }
}