/
PreviousCommand.cs
85 lines (76 loc) · 2.53 KB
/
PreviousCommand.cs
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using System;
using System.Windows.Automation;
namespace PlayNextSong
{
public class PreviousCommand : IKeyboardShortcutCommand
{
public InvokePattern InvokePattern { get; private set; }
public PreviousCommand()
{
Id = Guid.NewGuid().GetHashCode();
}
public int Id
{
get;
set;
}
public uint Modifiers
{
get
{
return (uint)KeyboardModifierKeys.MOD_NONE;
}
}
public uint VirtualKey
{
get
{
return (uint)KeyCodes.VK_MEDIA_PREV_TRACK;
}
}
public void Invoke()
{
if (InvokePattern != null)
{
try
{
InvokePattern.Invoke();
}
catch (Exception)
{
Initialize();
InvokePattern.Invoke();
}
}
else
{
Initialize();
InvokePattern.Invoke();
}
}
public bool Initialize()
{
string lpszParentClass = "IEFrame";
IntPtr ParenthWnd = new IntPtr(0);
ParenthWnd = NativeMethods.FindWindow(lpszParentClass, null);
if (!ParenthWnd.Equals(IntPtr.Zero))
{
var nameProperty = new PropertyCondition(AutomationElement.NameProperty, "Previous");
var frameworkIdProperty = new PropertyCondition(AutomationElement.FrameworkIdProperty, "InternetExplorer");
var controlTypeProperty = new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Hyperlink);
var hasInvokePatter = new PropertyCondition(AutomationElement.IsInvokePatternAvailableProperty, true);
var condition = new AndCondition(controlTypeProperty, hasInvokePatter, frameworkIdProperty, nameProperty);
var elementCollection = AutomationElement.FromHandle(ParenthWnd).FindAll(TreeScope.Subtree | TreeScope.Element, condition);
foreach (AutomationElement item in elementCollection)
{
if (item.Current.Name == "Previous")
{
InvokePattern = (InvokePattern)item.GetCurrentPattern(InvokePattern.Pattern);
return true;
}
}
}
return false;
}
}
}