Constructor
new Commands(contextopt, CommandConstructoropt)
Adding the commands capability to an object allows to access naturaly to the undo, redo pattern.
Parameters:
| Name | Type | Attributes | Default | Description |
|---|---|---|---|---|
context |
Object |
<optional> |
this | Future commands execution context |
CommandConstructor |
Constructor |
<optional> |
Command | Constructor of the command |
- Source:
Example
const a = {
sum: 0,
incr() {
this.sum++;
},
decr() {
this.sum--;
}
};
const commands = new pattern.Commands(a);
commands.execute('incr', [], 'decr', []);
console.log(`a.sum = ${a.sum}`); // a.sum = 1;
commands.undo();
console.log(`a.sum = ${a.sum}`); // a.sum = 0;
commands.redo();
console.log(`a.sum = ${a.sum}`); // a.sum = 1;Methods
execute(execute, executeArguments, undoopt, executeArgumentsopt)
Execute the given command
Parameters:
| Name | Type | Attributes | Description |
|---|---|---|---|
execute |
String | Method to execute on the given context |
|
executeArguments |
Array | List of arguments to apply on the method |
|
undo |
String |
<optional> |
Method to apply for undo |
executeArguments |
Array |
<optional> |
List of arguments to apply on the undo method |
- Source:
Example
// ...
commands.execute('incr', [], 'decr', []);pushHistory(command) → {Commands}
Push the command to the commands history.
Parameters:
| Name | Type | Description |
|---|---|---|
command |
Command | Undoable command |
- Source:
Returns:
Commands with updated history
- Type
- Commands
undo()
Undo the last executed command if possible.
- Source:
- See: