का संभावित हल सीधे नियंत्रण की दृश्यता संपत्ति के लिए बाध्य करने के बजाय एक नियंत्रण के दृश्यता संपत्ति को DataBind करने के लिए एक घटक का उपयोग करने के लिए होगा। कोड नीचे देखें:
using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
public class ControlVisibilityBinding : Component
{
private static readonly object EventControlChanged = new object();
private static readonly object EventVisibleChanged = new object();
private System.Windows.Forms.Control _control;
private bool _visible = true;
public event EventHandler VisibleChanged
{
add { Events.AddHandler(EventVisibleChanged, value); }
remove { Events.RemoveHandler(EventVisibleChanged, value); }
}
public event EventHandler ControlChanged
{
add { Events.AddHandler(EventControlChanged, value); }
remove { Events.RemoveHandler(EventControlChanged, value); }
}
public ControlVisibilityBinding()
{
}
public ControlVisibilityBinding(IContainer container)
{
container.Add(this);
}
[DefaultValue(null)]
public System.Windows.Forms.Control Control
{
get { return _control; }
set
{
if(_control == value)
{
return;
}
WireControl(_control, false);
_control = value;
if(_control != null)
{
_control.Visible = _visible;
}
WireControl(_control, true);
OnControlChanged(EventArgs.Empty);
OnVisibleChanged(EventArgs.Empty);
}
}
[DefaultValue(true)]
public bool Visible
{
get { return _visible; }
set
{
if(_visible != value)
{
_visible = value;
}
if(Control != null)
{
Control.Visible = _visible;
}
OnVisibleChanged(EventArgs.Empty);
}
}
private void WireControl(Control control, bool subscribe)
{
if(control == null)
{
return;
}
if(subscribe)
{
control.VisibleChanged += Control_VisibleChanged;
}
else
{
control.VisibleChanged -= Control_VisibleChanged;
}
}
private void Control_VisibleChanged(object sender, EventArgs e)
{
OnVisibleChanged(EventArgs.Empty);
}
protected virtual void OnVisibleChanged(EventArgs e)
{
EventHandler subscribers = (EventHandler)Events[EventVisibleChanged];
if(subscribers != null)
{
subscribers(this, e);
}
}
protected virtual void OnControlChanged(EventArgs e)
{
EventHandler subscribers = (EventHandler)Events[EventControlChanged];
if(subscribers != null)
{
subscribers(this, e);
}
}
}
static class Program
{
[STAThread]
static void Main()
{
using(Form form = new Form())
using(FlowLayoutPanel groupBoxLayoutPanel = new FlowLayoutPanel())
using(RadioButton visibleButton = new RadioButton())
using(RadioButton hiddenButton = new RadioButton())
using(GroupBox groupBox = new GroupBox())
using(Label text = new Label())
using(ControlVisibilityBinding visibilityBinding = new ControlVisibilityBinding())
using(TextBox inputTextBox = new TextBox())
{
groupBoxLayoutPanel.Dock = DockStyle.Fill;
groupBoxLayoutPanel.FlowDirection = FlowDirection.LeftToRight;
groupBoxLayoutPanel.AutoSize = true;
groupBoxLayoutPanel.AutoSizeMode = AutoSizeMode.GrowAndShrink;
visibleButton.Text = "Show Label";
visibleButton.AutoSize = true;
hiddenButton.Text = "Hide Label";
hiddenButton.AutoSize = true;
groupBoxLayoutPanel.Controls.Add(visibleButton);
groupBoxLayoutPanel.Controls.Add(hiddenButton);
inputTextBox.Text = "Enter Label Text Here";
inputTextBox.Dock = DockStyle.Top;
groupBox.AutoSize = true;
groupBox.AutoSizeMode = AutoSizeMode.GrowAndShrink;
groupBox.Controls.Add(groupBoxLayoutPanel);
groupBox.Dock = DockStyle.Fill;
text.AutoSize = true;
text.ForeColor = Color.Red;
text.Dock = DockStyle.Bottom;
text.BorderStyle = BorderStyle.FixedSingle;
text.Font = new Font(text.Font.FontFamily, text.Font.Size * 1.25f, FontStyle.Bold | FontStyle.Italic);
text.DataBindings.Add("Text", inputTextBox, "Text", true, DataSourceUpdateMode.Never);
visibilityBinding.Control = text;
visibleButton.DataBindings.Add("Checked", visibilityBinding, "Visible", true, DataSourceUpdateMode.OnPropertyChanged);
Binding binding = hiddenButton.DataBindings.Add("Checked", visibilityBinding, "Visible", true, DataSourceUpdateMode.OnPropertyChanged);
ConvertEventHandler invertConverter = (sender, e) => e.Value = !((bool)e.Value);
binding.Format += invertConverter;
binding.Parse += invertConverter;
form.Controls.Add(inputTextBox);
form.Controls.Add(text);
form.Controls.Add(groupBox);
Application.Run(form);
}
}
}
}
स्रोत
2011-06-01 15:28:20
कैसे आप बाध्यकारी हैं? एक बाइंडिंगसोर्स नियंत्रण या घोषणात्मक के साथ? –
@matt - bindingsource –
इस के साथ ऐसा करने के लिए कुछ हो सकता है: http://stackoverflow.com/a/2570153/2455604 – Marwie