View source for Identifying Multiple Event Sources From A Single Callback

← Identifying Multiple Event Sources From A Single Callback

Jump to: navigation, search

You do not have permission to edit this page, for the following reason:

The action you have requested is limited to users in the group: Users.

You can view and copy the source of this page:

Sometimes you would like to identify the sender of an event from within your callback function. For example, you would like to execute some common code for your buttons, like triggering a sound to be played on CEGUI::PushButton::EventClicked. Here is an example [http://www.cegui.org.uk/api_reference/classCEGUI_1_1PushButton.html CEGUI::PushButton] we would like to wire up:

<source lang="cpp">
CEGUI::PushButton* pushButton = 
  static_cast<CEGUI::PushButton*>
    (CEGUI::WindowManager::getSingleton().createWindow("WindowsLook/Button", "TheButton"));

pushButton->subscribeEvent(CEGUI::PushButton::EventClicked,
                           CEGUI::Event::Subscriber(&MainMenu::OnButtonClick, this));
</source>

To do this, simply cast the [http://www.cegui.org.uk/api_reference/classCEGUI_1_1EventArgs.html CEGUI::EventArgs] in your callback to a [http://www.cegui.org.uk/api_reference/classCEGUI_1_1WindowEventArgs.html CEGUI::WindowEventArgs]. The CEGUI::WindowEventArgs object contains a pointer to the [http://www.cegui.org.uk/api_reference/classCEGUI_1_1Window.html CEGUI::Window] that sent the event. Now its as easy as calling CEGUI::Window::getName(). Obviously, you can do much more now that you have a pointer to the window who fired the event, but this is just an example:

<source lang="cpp">
bool MainMenu::OnButtonClick(const CEGUI::EventArgs& e)
{
  const CEGUI::MouseEventArgs& we = 
    static_cast<const CEGUI::MouseEventArgs&>(e);

  CEGUI::String senderID = we.window->getName();

  if (senderID == "TheButton")
  {
    // code for dealing with a "TheButton"
  }

  return true;
}
</source>

[[Category:HowTo]]

Return to Identifying Multiple Event Sources From A Single Callback.

Retrieved from "http://cegui.org.uk/wiki/Identifying_Multiple_Event_Sources_From_A_Single_Callback"

View source for Identifying Multiple Event Sources From A Single Callback

Navigation menu

Personal tools

Namespaces

Variants

Views

More

Search

Main

Community

Documentation

Tools