Question

有一个带有要购买的商品的gridView。

Group
 - Checkbox|Item Description

每组最多可购买物品。

我想在达到最大值时（每组）更改所有未选择行的外观。

示例：

从每个组中选择1个项目

第1组

[]第1项
[]第2项

第2组

[]第3项
[]第4项
[]第5项

选择后

第1组

[x]第1项
[]第2项

第2组

[]第3项
[x]第4项
[]第5项

在检查每组上的最大项目数量后，我想改变其余项目的外观。

我有第一列的小组摘要。我的问题是我不知道如何触发所有细胞的外观变化。计算每个单元格离开事件中的选定项目是否正确，或者是否有更好的方法来实现此目的？

Answer 1

我使用GridControl创建了Devexpress模板。人类是为我创建的。我为这个例子稍微改了一下。

public class Person {

    public Person(string firstName, string secondName) {
        this.FirstName = firstName;
        this.SecondName = secondName;
        this.Comments = String.Empty;
    }
    public Person(string firstName, string secondName, string comments)
        : this(firstName, secondName) {
            this.Comments = comments;
    }

    public bool Selected
    {
        get;
        set;
    }

    public bool Blocked
    {
        get;
        set;
    }

    public string FirstName
    {
        get;
        set;
    }
    public string SecondName
    {
        get;
        set;
    }
    public string Comments
    {
        get;
        set;
    }
}

我的网格看起来像这样：

My grid looks like this

我通过代码实现了您的功能：

public partial class Form1 : XtraForm
{
    int max = 2;

    public Form1()
    {
        InitializeComponent();
        InitGrid();

    }
    List<Person> gridDataList = new List<Person>();
    void InitGrid()
    {
        gridDataList.Add(new Person("John", "Smith"));
        gridDataList.Add(new Person("Gabriel", "Smith"));
        gridDataList.Add(new Person("Ashley", "Smith", "some comment"));
        gridDataList.Add(new Person("Adrian", "Smith", "some comment"));
        gridDataList.Add(new Person("Gabriella", "Smith", "some comment"));
        gridDataList.Add(new Person("John", "Forester"));
        gridDataList.Add(new Person("Gabriel", "Forester"));
        gridDataList.Add(new Person("Ashley", "Forester", "some comment"));
        gridDataList.Add(new Person("Adrian", "Forester", "some comment"));
        gridDataList.Add(new Person("Gabriella", "Forester", "some comment"));
        bindingSource1.DataSource = gridDataList;
    }

    private void gridView1_CellValueChanged(object sender, DevExpress.XtraGrid.Views.Base.CellValueChangedEventArgs e)
    {
        int parentHandle = gridView1.GetParentRowHandle(e.RowHandle);
        int count = gridView1.GetChildRowCount(parentHandle);
        int childHandle = -1;
        int nCount = 0;
        for (int i = 0; i < count; i++)
        {
            childHandle = gridView1.GetChildRowHandle(parentHandle, i);
            Person p = gridView1.GetRow(childHandle) as Person;
            if (p != null)
            {
                p.Blocked = false;
                if (p.Selected)
                {
                    nCount++;
                }
            }
        }
        if (nCount == max)
        {
            for (int i = 0; i < count; i++)
            {
                childHandle = gridView1.GetChildRowHandle(parentHandle, i);
                Person p = gridView1.GetRow(childHandle) as Person;
                if (p != null && !p.Selected)
                {
                    p.Blocked = true;
                }
            }
        }
        // to redraw grid
        gridView1.RefreshData();
    }

    private void richedSelected_EditValueChanged(object sender, EventArgs e)
    {
        gridView1.PostEditor();
    }

    private void gridView1_CustomDrawCell(object sender, DevExpress.XtraGrid.Views.Base.RowCellCustomDrawEventArgs e)
    {
        Person p = gridView1.GetRow(e.RowHandle) as Person;
        if (p != null && p.Blocked)
        {
            e.Appearance.ForeColor = Color.White;
        }
    }

    private void richedSelected_EditValueChanging(object sender, DevExpress.XtraEditors.Controls.ChangingEventArgs e)
    {
        Person p = gridView1.GetRow(gridView1.FocusedRowHandle) as Person;
        if (p != null && p.Blocked)
        {
            e.Cancel = true;
        }
    }

}

这当然是简化的实施。只是为了让你走上正轨。

设计师的元素：

    private DevExpress.XtraGrid.GridControl gridControl;
    private DevExpress.XtraGrid.Views.Grid.GridView gridView1;
    private System.Windows.Forms.BindingSource bindingSource1;
    private DevExpress.XtraGrid.Columns.GridColumn colFirstName;
    private DevExpress.XtraGrid.Columns.GridColumn colSecondName;
    private DevExpress.XtraGrid.Columns.GridColumn colComments;
    private DevExpress.XtraGrid.Columns.GridColumn colSelected;
    private DevExpress.XtraEditors.Repository.RepositoryItemCheckEdit richedSelected;

如果您找到更好的解决方案，请告诉我。

Answer 2

以下是我需要link

的示例

Devexpress GridView条件单元格格式

2 个答案: