using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;

// The 'windowHandle' parameter will contain the window handle for the:
//   - Active window when run by hotkey
//   - Trigger target when run by a Trigger rule
//   - TitleBar Button owner when run by a TitleBar Button
//   - Jump List owner when run from a Taskbar Jump List
//   - Currently focused window if none of these match
public static class DisplayFusionFunction
{
    [DllImport("User32.dll")]
    private static extern short GetKeyState(int nVirtKey);

	public static void Run(IntPtr windowHandle)
	{
        //run a function to minimize all the other windows
		BFS.DisplayFusion.RunFunction("Pause Desktop Wallpaper Slideshow");
		
		//wait for other keys to be pressed
        while(!IsAnyKeyDown())
            BFS.General.ThreadWait(10);
            
        //span the current window over all monitors
        BFS.DisplayFusion.RunFunction("Pause Desktop Wallpaper Slideshow");
	}
	
	//this function uses the GetKeyState function to see if any keys are pressed
	private static bool IsAnyKeyDown()
	{
        //enumerate through all keys in the Keys enum
        foreach(Keys key in Enum.GetValues(typeof(Keys)))
        {
            //get the key's state
            short state = GetKeyState((int)key);
            
            //if the key isn't pressed, continue
            if((state & 0x8000) == 0)
                continue;
                
            //if the key is pressed, return true
            return true;
        }
        
        //we didn't find any keys that were pressed. return false
        return false;
    }
}