Question

我正在尝试用单声道和GTK锐利开发一个非常简单的GUI。我有两个组合框，我需要根据第一个选择的项目更改secod中可用的选项：

//Create window container
var mainContainer = new Table (3, 1, false);

//add form
var formContainer = new Table (1, 3, true);

//FIRST COMBOBOX
pdfSelect = new ComboBox(new string[] {"Monthly", "Monthly Offline", "Quarterly" }) { Active = 2 };
pdfSelect.Changed += new EventHandler(OnPdfSelectChanged);
formContainer.Attach (pdfSelect, 1, 2, 0, 1);

//MONTH COMBOBOX
monthSelect = new ComboBox(new string[] { "January","February","March","April","May","June","July","August","September","October","November","December" }){ Active = 0 };

formContainer.Attach(monthSelect, 2, 3, 0, 1);

mainContainer.Attach(formContainer, 0, 1, 0, 1);

win.Add(mainContainer);

我的更改活动如下：

public static void OnPdfSelectChanged(object o, EventArgs args) {
    ComboBox combo = o as ComboBox;
    if (o == null) return;
    if (combo.ActiveText.Equals("Monthly") || combo.ActiveText.Equals("Monthly Offline"))
    {
        monthSelect = new ComboBox(new string[] { "January","February","March","April","May","June","July",
            "August","September","October","November","December" }) { Active = 0 };
    }
    else
    {
        monthSelect = new ComboBox(new string[] { "January", "April", "July", "October" }) { Active = 0 };
    }
    //TODO REFRESH WINDOW
}

代码有效，但第二个组合框似乎没有更新。我想我需要刷新窗口？

由于

Answer 1

问题是您要为Gtk.ComboBox变量分配一个新的monthSelect，但不会自动从窗口中删除旧的组合框并添加新的组合框。你想要的是清除组合框的内容并添加新的内容。类似的东西：

monthSelect.Clear();
monthSelect.AppendText("January");
monthSelect.AppendText("April");
monthSelect.AppendText("July");
monthSelect.AppendText("October");

Answer 2

我得到它的工作两个意思是调用Clear()作为雾说（+ 1）但在那之后你需要分配一个单元格的rendertext或新的项目将不会显示：

Gtk.ComboBox.Clear Method "Unsets all the mappings on all renderers for this combo box."

public static void OnPdfSelectChanged(object o, EventArgs args) {
    ComboBox combo = o as ComboBox;
    if (o == null) return;
    //Set entries
    var entries = new string[] {  "January","February","March","April","May","June","July", "August","September","October","November","December" };
    if (combo.ActiveText.Equals("Quarterly"))
    {
        entries = new string[] { "January", "April", "July", "October" };
    }
    //clear previous data
    monthSelect.Clear();
    //cells data
    ListStore store = new ListStore(typeof(string));
    foreach (var item in entries) {
        store.AppendValues(item);
    }
    //assign data to combobox
    monthSelect.Model = store;
    //renderer for cells
    var cellRenderer = new CellRendererText();
    monthSelect.PackStart(cellRenderer, true);
    monthSelect.AddAttribute(cellRenderer, "text", 0);
    //set first item as active
    monthSelect.Active = 0;
}

Answer 3

也许为时已晚，但......

((ListStore)combobox.Model).Clear(); 
combobox.AppendText("item");

GTK Sharp Refresh / Redraw小部件

3 个答案: