1 using System;
 2 using System.Windows;
 3 
 4 class HelloWindow : Window
 5 {
 6     public HelloWindow() : base("Hello"), numHellos(0), color(0u, 90u,   180u),  brush(color), fontFamily(FontFamily.GenericSansSerif()), font(fontFamily, 14.000000f)
 7     {
 8         if (brush.Error())
 9         {
10             SetErrorId(brush.GetErrorId());
11             return;
12         }
13         if (fontFamily.Error())
14         {
15             SetErrorId(fontFamily.GetErrorId());
16             return;
17         }
18         if (font.Error())
19         {
20             SetErrorId(font.GetErrorId());
21             return;
22         }
23         Size s = GetSize();
24         Size defaultButtonSize = ScreenMetrics.Get().DefaultButtonSize();
25         Size defaultControlSpacing = ScreenMetrics.Get().DefaultControlSpacing();
26         int x = s.w - defaultButtonSize.w - defaultControlSpacing.w;
27         int y = s.h - defaultButtonSize.h - defaultControlSpacing.h;
28 
29         UniquePtr<Button> helloButton(new Button(ButtonCreateParams(ButtonControlCreateParams(
30             ControlCreateParams().SetText("Hello").SetLocation(Point(x, y)).SetSize(defaultButtonSize).
31             SetAnchors(cast<Anchors>(Anchors.bottom | Anchors.right))))));
32         if (helloButton->Error())
33         {
34             SetErrorId(helloButton->GetErrorId());
35             return;
36         }
37         helloButton->ClickEvent().AddHandler(HelloButtonClick);
38         auto result = AddChild(helloButton.Release());
39         if (result.Error())
40         {
41             SetErrorId(result.GetErrorId());
42             return;
43         }
44         PaintEvent().AddHandler(Paint);
45     }
46     private void HelloButtonClick(ClickEventArgs& args)
47     {
48         ++numHellos;
49         auto result = Invalidate();
50         if (result.Error())
51         {
52             args.errorId = result.GetErrorId();
53             return;
54         }
55     }
56     private void Paint(PaintEventArgs& args)
57     {
58         PointF origin(10.000000f, 10.000000f);
59         float height = font.GetHeight(args.graphics);
60         for (int i = 0; i < numHellos; ++i;)
61         {
62             auto drawStringResult = args.graphics.DrawString("Hello, World!", font, origin, brush);
63             if (drawStringResult.Error())
64             {
65                 string errorMessage = drawStringResult.GetErrorMessage();
66                 MessageBox.Show(errorMessage, "error");
67                 return;
68             }
69             else
70             {
71                 origin.y = origin.y + height;
72             }
73         }
74     }
75     private int numHellos;
76     private Color color;
77     private SolidBrush brush;
78     private FontFamily fontFamily;
79     private Font font;
80     private Button* helloButton;
81 }
82 
83 int main()
84 {
85     HelloWindow helloWindow;
86     if (helloWindow.Error())
87     {
88         string errorMessage = GetErrorMessage(helloWindow.GetErrorId());
89         MessageBox.Show(errorMessage, "error");
90         return 1;
91     }
92     return Application.Run(helloWindow);
93 }