Question

我使用NodeView对象以这种方式向用户输出数据（Gtk＃tutorial）：

    [Gtk.TreeNode (ListOnly=true)]
    public class MyTreeNode : Gtk.TreeNode {

            string song_title;

            public MyTreeNode (string artist, string song_title)
            {
                    Artist = artist;
                    this.song_title = song_title; 
            }

            [Gtk.TreeNodeValue (Column=0)]
            public string Artist;

            [Gtk.TreeNodeValue (Column=1)]
            public string SongTitle {get { return song_title; } }
    }

Gtk.NodeStore store;
    Gtk.NodeStore Store 
    {
        get {
                if (store == null)
                {
                    store = new Gtk.NodeStore (typeof(MyTreeNode));
                    store.AddNode (new MyTreeNode ("The Beatles", "Yesterday"));
                    store.AddNode (new MyTreeNode ("Peter Gabriel", "In Your Eyes"));
                    store.AddNode (new MyTreeNode ("Rush", "Fly By Night"));
                }
            return store;
            }
    }

protected void OnButton1Clicked (object sender, EventArgs e)
{
    // Create a column with title Artist and bind its renderer to model column 0
    nodeview1.AppendColumn ("Artist", new Gtk.CellRendererText (), "text", 0);

    // Create a column with title 'Song Title' and bind its renderer to model column 1
    nodeview1.AppendColumn ("Song Title", new Gtk.CellRendererText (), "text", 1);
        nodeview1.ShowAll ();

    nodeview1.NodeStore=Store;

}

但是如何为NodeView的某些行着色（例如“The Beatles” - “昨天”）？我尝试通过更改NodeView样式来实现：Backgrounds，BaseColors，Foregrounds等，但它不起作用。

编辑：我刚才意识到，我可以这样改变色谱柱的颜色：

protected void OnButton1Clicked (object sender, EventArgs e)
{
    // Create a column with title Artist and bind its renderer to model column 0
    nodeview1.AppendColumn ("Artist", new Gtk.CellRendererText (), "text", 0);



    // Create a column with title 'Song Title' and bind its renderer to model column 1
    nodeview1.AppendColumn ("Song Title", new Gtk.CellRendererText (), "text", 1);
        nodeview1.ShowAll ();

    nodeview1.NodeStore=Store;
    nodeview1.Columns[0].Cells[0].CellBackgroundGdk=new Gdk.Color(0,255,0);
}

但是如何更改特定单元格的颜色？

Answer 1

要基于每行更改渲染属性，您有两种可能性

定义模型中的属性，然后在创建单元格渲染器时引用它们;或
编写您自己的TreeCellDataFunc并将其绑定到单元格渲染器，以确保在渲染之前更改其属性。

选项1更快但限制您使用静态定义的值;当渲染不仅仅依赖于一个变量并且你有一些逻辑时，2更好。我将向您展示如何操作1并参考Mono documentation获取2。

如果要更改前景色，只需在模型中添加新列：

[Gtk.TreeNode (ListOnly=true)]
public class MyTreeNode : Gtk.TreeNode 
{
    public MyTreeNode (string artist, string title, string color)
    {
        Artist = artist;
        Title = title; 
        Color = color;
    }

    [Gtk.TreeNodeValue (Column=0)]
    public string Artist;

    [Gtk.TreeNodeValue (Column=1)]
    public string Title;

    [Gtk.TreeNodeValue (Column=2)]
    public string Color;
}

将有效的Gdk颜色表示（如“red”或“＃ff0000”）传递给行构造函数：

store.AddNode(new MyTreeNode("The Beatles", "Yesterday", "red"));
store.AddNode(new MyTreeNode("Peter Gabriel", "In Your Eyes", "black"));

然后在构建视图时，只需将模型列（2）绑定到单元格渲染器的“foreground”属性：

nodeview1.AppendColumn("Artist", new Gtk.CellRendererText(), 
                       "text", 0, "foreground", 2);

nodeview1.AppendColumn("Song Title", new Gtk.CellRendererText(),
                       "text", 1, "foreground", 2);

就是这样。

Gtk＃NodeView彩色行

1 个答案: