# GrandExchangeHistory
Methods to interact with the GrandExchangeHistory interface:
```{figure} ../../images/geh_interface.png
```

The {ref}`GrandExchange` is a very complex interface, probably the most complex
available in OldSchool RuneScape and for that reason, the functionality to
fully interact with it is split into multiple files and records:
- {ref}`GrandExchange`, the main grand exchange screen.
- {ref}`GrandExchangeHistory`, the history screen of the grand exchange and what this page is about.
- {ref}`GrandExchangeChat`, the chat interface of the grand exchange when you are setting up a buy offer.
- {ref}`GrandExchangeOffer`, the screen of the grand exchange where you view or setup a new offer.


- - -

## TRSGrandExchangeHistory
Record responsible to handle the {ref}`GrandExchangeHistory` interface.


- - -

## GrandExchangeHistory.SetupInterface
```pascal
procedure TRSGrandExchangeHistory.SetupInterface();
```
Internal method used to setup the {ref}`TRSGrandExchangeHistory` coordinates.
This is automatically called for you on the {ref}`GrandExchangeHistory variable`.


- - -

## GrandExchangeHistory.IsOpen
```pascal
function TRSGrandExchangeHistory.IsOpen(): Boolean;
```
Returns true if the Grand Exchange is open.

Example:
```pascal
WriteLn GrandExchangeHistory.IsOpen();
```


- - -

## GrandExchangeHistory.WaitOpen
```pascal
function TRSGrandExchangeHistory.WaitOpen(time: Integer; interval: Integer = -1): Boolean;
```
Returns true if the Grand Exchange is open within `time` milliseconds.

## Example:
```pascal
WriteLn GrandExchangeHistory.WaitOpen();
```


- - -

## GrandExchangeHistory.Close
```pascal
function TRSGrandExchangeHistory.Close(escape: Boolean): Boolean;
function TRSGrandExchangeHistory.Close(escapeProbability: Single = 0): Boolean; overload;
```
Closes the GrandExchangeHistory, Depending on `escape` or `escapeProbability the function will
either click the button or press escape key.

Example:
```pascal
 WriteLn GrandExchangeHistory.Close();
```


- - -

## GrandExchangeHistory.Slots
```pascal
property TRSGrandExchangeHistory.Slots: TBoxArray;
```
Returns the slot boxes of the {ref}`GrandExchangeHistory` interface.

Example:
```pascal
{$I WaspLib/osrs.simba}
begin
  while True do
    ShowOnTarget(GrandExchangeHistory.Slots);
end.
```
```{figure} ../../images/geh_slots.gif
```


- - -

## GrandExchangeHistory.Open
```pascal
function TRSGrandExchangeHistory.Open(): Boolean;
```
Attempts to open the {ref}`GrandExchangeHistory`, returns `True` on success.

Example:
```pascal
WriteLn GrandExchangeHistory.Open();
```


- - -

## GrandExchangeHistory.Back
```pascal
function TRSGrandExchangeHistory.Back(): Boolean;
```
Attempts to click the back button: to return to the main Grand Exchange interface, returns `True` on success.

Example:
```pascal
WriteLn GrandExchangeHistory.Back();
```


- - -

## GrandExchangeHistory variable
Global {ref}`TRSGrandExchangeHistory` variable.