feat: re-organize file, add IsCloseButtonVisible option.

src/Ursa/Controls/Dialog/Options/DialogOptions.cs

@@ -0,0 +1,29 @@
+using Avalonia;
+using Avalonia.Controls;
+
+namespace Ursa.Controls;
+
+public class DialogOptions
+{
+    public static DialogOptions Default { get; } = new DialogOptions();
+    /// <summary>
+    /// The Startup Location of DialogWindow. Default is <see cref="WindowStartupLocation.CenterOwner"/>
+    /// </summary>
+    public WindowStartupLocation StartupLocation { get; set; } = WindowStartupLocation.CenterOwner;
+    /// <summary>
+    /// The Position of DialogWindow startup location if <see cref="StartupLocation"/> is <see cref="WindowStartupLocation.Manual"/>
+    /// </summary>
+    public PixelPoint? Position { get; set; }
+    /// <summary>
+    /// Title of DialogWindow, Default is null
+    /// </summary>
+    public string? Title { get; set; }
+    /// <summary>
+    /// DialogWindow's Mode, Default is <see cref="DialogMode.None"/>
+    /// </summary>
+    public DialogMode Mode { get; set; } = DialogMode.None;
+
+    public DialogButton Button { get; set; } = DialogButton.OKCancel;
+
+    public bool IsCloseButtonVisible { get; set; } = true;
+}