如何在DataGridView中添加自定义控件(LedLight)? [英] How to add a Custom Control(LedLight) in DataGridView?
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问题描述
嗨
我有一个名为LedLight的自定义控件，该控件继承了System.Windows.Forms.UserControl，并且必须将此控件添加到DataGridView列中.
我已经为自定义控件编写了以下代码.
Hi
I have a custom control named LedLight which inherits the System.Windows.Forms.UserControl and I have to add this control to DataGridView column.
I have written follwing code for my custom control.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
namespace LedLight
{
public partial class Led : UserControl
{
private Timer tick;
public Led()
: base()
{
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.DoubleBuffer, true);
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.ResizeRedraw, true);
Width = 17;
Height = 17;
Paint += new PaintEventHandler(Led_Paint);
tick = new Timer();
tick.Enabled = false;
tick.Tick += new EventHandler(tick_Tick);
InitializeComponent();
}
#region Properties
/// <summary>
/// To Indicate whether it is Active
/// </summary>
private bool _Active = true;
[Category("Behavior"),
DefaultValue(true)]
public bool Active
{
get { return _Active; }
set { _Active = value; }
}
/// <summary>
/// Set the Color on
/// </summary>
private Color _ColorOn = Color.Red;
[Category("Appearance")]
public Color ColorOn
{
get { return _ColorOn; }
set { _ColorOn = value; Invalidate(); }
}
/// <summary>
/// Set the Color Off.
/// </summary>
private Color _ColorOff = SystemColors.Control;
[Category("Appearance")]
public Color ColorOff
{
get { return _ColorOff; }
set { _ColorOff = value; Invalidate(); }
}
/// <summary>
/// To set the Flash property
/// </summary>
private string _FlashIntervals = "250";
[Category("Appearance"),
DefaultValue("250")]
public int[] flashIntervals = new int[1] { 250 };
public string FlashIntervals
{
get { return _FlashIntervals; }
set
{
_FlashIntervals = value;
string[] fi = _FlashIntervals.Split(new char[] { '','', ''/'', ''|'', '' '', ''\n'' });
flashIntervals = new int[fi.Length];
for (int i = 0; i < fi.Length; i++)
try
{
flashIntervals[i] = int.Parse(fi[i]);
}
catch
{
flashIntervals[i] = 25;
}
}
}
/// <summary>
/// To set the Flash property
/// </summary>
private string _FlashColors = string.Empty;
[Category("Appearance"),
DefaultValue("")]
public Color[] flashColors;
public string FlashColors
{
get { return _FlashColors; }
set
{
_FlashColors = value;
if (_FlashColors == string.Empty)
{
flashColors = null;
}
else
{
string[] fc = _FlashColors.Split(new char[] { '','', ''/'', ''|'', '' '', ''\n'' });
flashColors = new Color[fc.Length];
for (int i = 0; i < fc.Length; i++)
try
{
flashColors[i] = (fc[i] != "") ? Color.FromName(fc[i]) : Color.Empty;
}
catch
{
flashColors[i] = Color.Empty;
}
}
}
}
/// <summary>
/// To set the Flash property
/// </summary>
private bool _Flash = false;
[Category("Behavior"),
DefaultValue(false)]
public bool Flash
{
get { return _Flash; }
set
{
_Flash = value && (flashIntervals.Length > 0);
tickIndex = 0;
tick.Interval = flashIntervals[tickIndex];
tick.Enabled = _Flash;
Active = true;
}
}
#endregion
#region helper color function
private static Color FadeColor(Color c1, Color c2, int i1, int i2)
{
int r = (i1 * c1.R + i2 * c2.R) / (i1 + i2);
int g = (i1 * c1.G + i2 * c2.G) / (i1 + i2);
int b = (i1 * c1.B + i2 * c2.B) / (i1 + i2);
return Color.FromArgb(r, g, b);
}
public static Color FadeColor(Color c1, Color c2)
{
return FadeColor(c1, c2, 1, 1);
}
#endregion
/// <summary>
/// Fires after every specified interval of time.
/// </summary>
public int tickIndex;
void tick_Tick(object sender, EventArgs e)
{
tickIndex = (++tickIndex) % (flashIntervals.Length);
tick.Interval = flashIntervals[tickIndex];
try
{
if ((flashColors == null)
|| (flashColors.Length < tickIndex)
|| (flashColors[tickIndex] == Color.Empty))
Active = !Active;
else
{
ColorOn = flashColors[tickIndex];
Active = true;
}
}
catch
{
Active = !Active;
}
}
/// <summary>
/// paints the LED lights
/// </summary>
void Led_Paint(object sender, PaintEventArgs e)
{
e.Graphics.Clear(BackColor);
if (Enabled)
{
if (Active)
{
e.Graphics.FillEllipse(new SolidBrush(ColorOn), 1, 1, Width - 3, Height - 3);
e.Graphics.DrawArc(new Pen(FadeColor(ColorOn, Color.White, 1, 2), 2), 3, 3, Width - 7, Height - 7, -90.0F, -90.0F);
e.Graphics.DrawEllipse(new Pen(FadeColor(ColorOn, Color.Black), 1), 1, 1, Width - 3, Height - 3);
}
else
{
e.Graphics.FillEllipse(new SolidBrush(ColorOff), 1, 1, Width - 3, Height - 3);
e.Graphics.DrawArc(new Pen(FadeColor(ColorOff, Color.Black, 2, 1), 2), 3, 3, Width - 7, Height - 7, 0.0F, 90.0F);
e.Graphics.DrawEllipse(new Pen(FadeColor(ColorOff, Color.Black), 1), 1, 1, Width - 3, Height - 3);
}
}
else
{
e.Graphics.DrawEllipse(new Pen(System.Drawing.SystemColors.ControlDark, 1), 1, 1, Width - 3, Height - 3);
}
}
private void Led_Load(object sender, EventArgs e)
{
}
}
我为Column编写的以下代码.
The following code I have written for Column.
public class LedColumn : DataGridViewColumn
{
public LedColumn()
: base()
{
new Led();
}
public override DataGridViewCell CellTemplate
{
get
{
return base.CellTemplate;
}
set
{
//Ensure that the cell used for the Template is a Led cell.
if (value != null && !value.GetType().IsAssignableFrom(typeof(LedCell)))
{
throw new InvalidCastException("Must be a Led cell.");
}
base.CellTemplate = value;
}
}
}
这是Cell的代码.
This is the code for Cell.
public class LedCell : DataGridViewCell
{
public LedCell()
: base()
{
}
protected override object GetFormattedValue(object value, int rowIndex, ref DataGridViewCellStyle cellStyle, TypeConverter valueTypeConverter, TypeConverter formattedValueTypeConverter, DataGridViewDataErrorContexts context)
{
return value;
}
public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
{
// Set the value of the editing control to the current cell value.
base.InitializeEditingControl(rowIndex, initialFormattedValue,
dataGridViewCellStyle);
LedEditingControl ctl = DataGridView.EditingControl as LedEditingControl;
// Use the default row value when Value property is null.
//Use Default Row when the Property is null.
if (this.Value == null)
{
// ctrl.Value = (Led)this.DefaultNewRowValue;
}
else
{
// ctrl.Value = (Led)this.Value;
}
}
public override Type EditType
{
get
{
//Returns the Type of Editing control that Ledcell uses.
return null;
}
}
public override Type ValueType
{
get
{
// Return the Type of value that the LedCell contains
return typeof(System.Object);
}
}
public override object DefaultNewRowValue
{
get
{
//Use Led as Default Value.
return new Led();
}
}
}
而且，这是用于编辑控件
And, This is for editing Control
class LedEditingControl : Led,IDataGridViewEditingControl
{
DataGridView dataGridView;
int rowIndex;
private bool valueChanged = false;
public LedEditingControl()
{
}
#region IDataGridViewEditingControl Members
public void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)
{
this.Font = dataGridViewCellStyle.Font;
}
public DataGridView EditingControlDataGridView
{
get
{
return dataGridView;
}
set
{
dataGridView = value;
}
}
public object EditingControlFormattedValue
{
get
{
return typeof(System.Object);
}
set
{
if (value is LedCell)
{
}
}
}
public int EditingControlRowIndex
{
get
{
return rowIndex;
}
set
{
rowIndex = value;
}
}
public bool EditingControlValueChanged
{
get
{
return valueChanged;
}
set
{
valueChanged = value;
}
}
public bool EditingControlWantsInputKey(Keys keyData, bool dataGridViewWantsInputKey)
{
return !dataGridViewWantsInputKey;
}
public Cursor EditingPanelCursor
{
get { return Cursor; }
}
public object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context)
{
return EditingControlFormattedValue;
}
public void PrepareEditingControlForEdit(bool selectAll)
{
}
public bool RepositionEditingControlOnValueChange
{
get { return false; }
}
#endregion
}
}
请在这里的任何人都可以帮助我.
在此先感谢.
Plz any one here can help me.
Thanks in advance.
推荐答案
如果是自定义控件，则在编译类库时将创建一个DLL.在Visual Studio工具箱中添加该控件，该控件将作为其他标准控件出现在页面设计器中.
您无需添加任何特定于自定义控件的代码即可使用它.
If it is a custom control then a DLL would have been created on compiling the class library. Add that in your Visual Studio toolbox and the control would appear as other standard controls to be drag-dropped on the page designer.
You don''t need to add any custom-control specific code as such to use it.
数据网格仅托管当前可编辑单元格中的控件.在其他任何地方，它仅通过调用DataGridViewCell.Paint绘制单元格内容.您需要创建自定义列和单元格类型，而不是自定义控件.我不确定何时调用Paint，闪烁的灯光可能更难实现–无论如何，它们不太可能是在数据网格中的良好用户体验.
The data grid only hosts controls within the currently editable cell. Everywhere else, it just paints the cell contents, by calling DataGridViewCell.Paint. You need to create a custom column and cell type, not a custom control. I''m not sure when Paint gets called, flashing lights may be more difficult to achieve – they''re not likely to be a good user experience in a data grid anyway.
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