[C#.NET][VB.NET][Winform][User Control] 自訂控制項的自訂屬性編輯視窗 / User Control of Custom Properties Editor

2010-07-04

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2013-08-16

這次我們必須要使用到基底類別： UITypeEditor

使用這個類別我們必須要覆寫以下兩個方法

1.EditValue：處理使用者介面、使用者輸入處理和值的設定。也就是在這個方法實體化你所要處理的視窗，在這裡我們有兩種視窗的彈出呈現方式可以用，IWindowsFormsEditorService 介面

1-1.DropDownControl(Control control) ：下拉式清單的方式呈現。

1-2.ShowDialog(Form dialog) ：彈出視窗的方式呈現。

2.GetEditStyle ：以通知編輯器樣式的屬性視窗，也就是選擇編輯風格，UITypeEditorEditStyle 列舉型別

2-1 UITypeEditorEditStyle.Modal：顯示下拉選單按鈕。

2-2 UITypeEditorEditStyle.DropDown：顯示(...) 按鈕。

2-3 UITypeEditorEditStyle.None：沒有互動介面。

瞭解要做什麼之後就可以開始來寫code，首先建立一個UserControl專案名為myUITypeEditor 並繼承 UITypeEditor，覆寫EditValue、GetEditStyle方法。

public class myUITypeEditor : UITypeEditor
{
    private Size DataSize;//用來存放視窗讀到的值
    public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
    {
        IWindowsFormsEditorService EditorService = null;
        if (context != null && context.Instance != null && provider != null)
        {
            //建立編輯服務
            EditorService = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
            //讀取自訂視窗的值
            PropertyListEditor ListEditorControl;
            PropertyFormEditor FormEditorControl;
            if (DataSize != null)
            {
                ListEditorControl = new PropertyListEditor(DataSize);
                FormEditorControl = new PropertyFormEditor(DataSize);
            }
            else
            {
                ListEditorControl = new PropertyListEditor(new Size(0, 0));
                FormEditorControl = new PropertyFormEditor(new Size(0, 0));
            }
            //建立編輯彈跳畫面
            //法一：下拉清單
            //EditorService.DropDownControl(ListEditorControl);//畫面彈跳方式
            //DataSize = ListEditorControl.size;
            //法二：視窗
            EditorService.ShowDialog(FormEditorControl);//畫面彈跳方式
            DataSize = FormEditorControl.size;
            return DataSize;
        }
        else
        {
            return null;
        }
    } 

    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
    {
        if (context != null && context.Instance != null)
        {
            return UITypeEditorEditStyle.Modal;
            //return UITypeEditorEditStyle.DropDown;
            //return UITypeEditorEditStyle.None;
        }
        return base.GetEditStyle(context);
    }
}

PS.ListEditorControl及FormEditorControl是兩種不同的呈現方式，擇一使用

接下來開始來刻我們所要呈現的UI，加入新的項目，分別加入一個Winform及一個UserControl項目

UserControl：PropertyListEditor

internal partial class PropertyListEditor : UserControl
{
    private Size _size;
    public Size size
    {
        get { return _size; }
        set { _size = value; }
    }
    public PropertyListEditor()
    {
        InitializeComponent();
    } 

    public PropertyListEditor(Size size)
    {
        InitializeComponent();
        this.size = size;
    } 

    private void PropertyListEditor_Load(object sender, EventArgs e)
    {
        if (_size != null)
        {
            this.txtWidth.Text = _size.Width.ToString();
            this.txtHeight.Text = _size.Height.ToString();
        }
    } 

    private void PropertyListEditor_Leave(object sender, EventArgs e)
    {
        if (this.txtWidth.Text != "" && this.txtHeight.Text != "")//判斷輸入的內容，我懶的寫....
            _size = new Size(Convert.ToInt16(txtWidth.Text), Convert.ToInt16(txtHeight.Text));
    }
}

Winform：PropertyFormEditor

internal partial class PropertyFormEditor : Form
{
    private Size _size;
    public Size size
    {
        get { return _size; }
        set { _size = value; }
    }
    public PropertyFormEditor()
    {
        InitializeComponent();
    }
    public PropertyFormEditor(Size size)
    {
        InitializeComponent();
        this.size = size;
    }
    private void PropertyFormEditor_Load(object sender, EventArgs e)
    {
        if (_size != null)
        {
            this.txtWidth.Text = _size.Width.ToString();
            this.txtHeight.Text = _size.Height.ToString();
        }
    } 

    private void PropertyFormEditor_FormClosing(object sender, FormClosingEventArgs e)
    {
        if (this.txtWidth.Text != "" && this.txtHeight.Text != "")//判斷輸入的內容，我懶的寫....
        {
            _size = new Size(Convert.ToInt16(txtWidth.Text), Convert.ToInt16(txtHeight.Text));
        }
    }
}

我將兩種呈現方式都寫出來，不過這兩個UI的程式都一模一樣，不同的是當輸入資料完畢視窗關閉的事件觸發不一樣

UserControl是用Leave事件把視窗所輸入的值寫到欄位裡，而Winform是用FormClosing事件；以及它們所繼承的類別也不同

最後這一個公開類別裡設定我們要的屬性

public partial class UserControlType : UserControl
{
    public UserControlType()
    {
        InitializeComponent();
    }
    private Size _size = new Size();
    [Category("A Test")]
    [Editor(typeof(myUITypeEditor), typeof(UITypeEditor))]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public Size size
    {
        get { return _size; }
        set { _size = value; }
    }
}