不启用时关闭鼠标交互

Question

Lets say I have my C# program running, there is a button on the screen that if I put my mouse over it, it will change the game to a new page. Now I put another window in front of the project, lets say Google Chrome, and I am searching the web and clicking things, as I do that the project that is running right now is interacting with the mouse still and can have the button pressed even if I can't see the button. How do I turn this interaction off?

Answer 1

By using IsActive in your implementation of the Game class (called Game1 by default), you can avoid receiving input while your game is not in focus.

protected override void Update(GameTime gameTime)
{
    base.Update(gameTime);

    if (!IsActive)
    {
        return;
    }

    // ... do regualr update.
}

http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.game.isactive.aspx

---

Alternatively, if you already have some Game State Management system, you can override the OnDeactived method in Game. This function will get called when the game looses focus.

protected override void OnDeactivated(object sender, EventArgs args)
{
    base.OnDeactivated(sender, args);

    // If we are in a state which it makes sense to pause the game, then do it now.
    if (GameObjectManager.pInstance.pCurUpdatePass == BehaviourDefinition.Passes.GAME_PLAY)
    {
        GameObjectManager.pInstance.pCurUpdatePass = BehaviourDefinition.Passes.GAME_PLAY_PAUSED;
    }
}

http://msdn.microsoft.com/en-us/library/microsoft.xna.framework.game.ondeactivated.aspx