I have a Windows Form (MainForm1) that contains a ToolStrip with a label in it (StatusLabel). MainForm1 also contains a User Control (UserControl1). The User Control contains a button (Button1). When Button1 is clicked it initializes a DataGridView, but that is not important.
When Button1 is clicked in UserControl1, I want to display text in the MainForms StatusLabel.
But I don't know how to do that from one UserControl to the MainForm.
The flow chart describes how I would like it to function.
You can do this simply by creating an event in your User Control
public event EventHandler<string> MessageHasSent;
public void SendMessage(string message)
{
EventHandler<string> ms = MessageHasSent;
if (ms!= null)
{
ms(this,message);
}
}
And in every where in your class that you want Raise this event.In your case you want by clicking on button send message
public Button1_Click( object sender,EventArgs e)
{
SendMessage("YourMessage");
}
And use it like other events.In your MainForm use this event of your UserControl .
public class MainForm:Form
{
public MainForm()
{
UserControl1.MessageHasSent +=SetToolStripLabel;
}
public SetToolStripLabel( object sender,string e)
{
//Set e to Label
}
}
Related
I want when the project is starting to create a custom event for every click event inside my textbox.
Then when a new textbox will be created, automatically use this click event.
I don't want to create a custom control for this. I want to assign it once from a method.
Or if it is possible to create a default constructor for all my elements without creating a custom control.
For example, I don't want to create this. Cause I need to replace all my controls
using System;
using System.ComponentModel;
using System.Windows.Forms;
namespace DXApplication1
{
[ToolboxItem(true)]
public class Class1 : TextBox
{
public Class1()
{
this.Click += Class1_Click;
}
private void Class1_Click(object sender, EventArgs e)
{
Console.WriteLine("Click Event");
}
}
}
I have 1000 textboxes on my project. I don't want to add in each onclick method
Is there any way to add a click event to all my textboxes in the project?
I want to add just one line of code to the program. cs. Is it possible?
I'd suggest that you simple traverse all of the controls on your form after you have placed them and then attach the event.
Try something like this:
IEnumerable<TextBox> AllTextBoxes(ScrollableControl #this)
{
foreach (Control control in #this.Controls)
{
if (control is ScrollableControl sc)
{
foreach (TextBox tb1 in AllTextBoxes(sc))
{
yield return tb1;
}
}
if (control is TextBox tb2)
{
yield return tb2;
}
}
}
foreach (var tb in AllTextBoxes(this))
{
tb.Click += (_, _) => MessageBox.Show("Hello");
}
If you derive your control from an existing control you can override the OnClick method instead of subscribing to the event.
public class TextBoxEx: TextBox
{
public TextBoxEx()
{
}
protected override void OnClick(EventArgs e)
{
Console.WriteLine("Click Event");
base.OnClick(e);
}
}
Then you can replace the type TextBox by TextBoxEx (with find/replace) in the form's .designer.cs file without having to delete and re-insert your textboxes.
Once you have compiled this code, the new textbox appears in the Toolbox window and you can drag and drop it to your form, just as with the standard textbox.
If you have a textBox1_Click method in your form, you can select this same method as event handler for all your textboxes in the properties window: How to: Connect Multiple Events to a Single Event Handler in Windows Forms
As I understand it, you have three requirements:
When the project starts, attach a click event to all TextBox instances already created in the Form designer.
When a new text box is created (programmatically or by user interaction) attach the click event to the new textbox automatically.
Implement this functionality without making a custom class.
This answer shows one way to meet these three objectives.
Utility
First, make a utility that can iterate all of the controls in the Form, but also all the controls of its child controls.
void IterateControlTree(Action<Control> action, Control control = null)
{
if (control == null)
{
control = this;
}
action(control);
foreach (Control child in control.Controls)
{
IterateControlTree(action, child);
}
}
Attach handler to all existing TextBox controls
Using this utility, initialize any textboxes added in design mode to route to the click handler.
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
IterateControlTree((control) =>
{
// Attach click handlers to the textboxes
// already added in the Forms designer.
if (control is TextBoxBase)
{
control.Click += onAnyClickTextBox;
}
});
.
.
.
}
// Show the name of the clicked text box.
private void onAnyClickTextBox(object sender, EventArgs e)
{
if(sender is Control control)
{
textBox1.Text = $"Clicked: {control.Name}";
}
}
}
Attach handler automatically to new TextBox controls
Iterate a second time to attach the ControlAdded event to every control. This way, new TextBox instances can be detected in order to attach the Click event.
public MainForm()
{
.
.
.
IterateControlTree((control) =>
{
control.ControlAdded += (sender, e) =>
{
// Get notified when any control collection is changed.
if(e.Control is TextBoxBase textbox)
{
textbox.Click += onAnyClickTextBox;
}
};
});
}
Testing
// FOR TESTING PURPOSES
int _id = 1;
private void onClickNew(object sender, EventArgs e)
{
flowLayoutPanel.Controls.Add(new TextBox
{
Name = $"dynamicTextBox{_id}",
PlaceholderText = $"TextBox{_id}",
});
_id++;
}
I am using C# and Xamarin. I have two separate classes. One class is essentially the user interface and another class is acting as a custom built generic entry for users to input data and search for results by clicking a button.
Main UI Class:
Class MainPage
{
public MainPage
{
Content = new StackLayout
{
Children =
{
new InputClass // This is my custom built user entry class
{
}.Invoke(ic => ic.Clicked += WhenButtonPressedMethod) // The problem is here, I can't figure out how to call the button within the input class to fire a clicked event.
}
}
}
}
public async void WhenButtonPressedMethod (object sender, EventArgs e)
{
// Supposed to do stuff when the button is pressed
}
InputClass:
public class InputClass : Grid
{
public delegate void OnClickedHandler(object sender, EventArgs e);
public event OnClickHandler Clicked;
public InputClass
{
Children.Add(
new Button {}
.Invoke(button => button.Clicked += Button_Clicked)
)
}
private void Button_Clicked(object sender, EventArgs e)
{
Clicked?.Invoke(this, e);
}
}
The "InputClass" is a grid that holds a title text label, an entry and a button that a user can press to submit and search data. The button in this class is what I'm trying to actually access to invoke/cause a click event so that the method in the main UI class can be called. But, when I try to invoke a click event on the "InputClass" I can't access the button inside of it, I can only access "InputClass" itself which is just a grid with no useful event properties.
Any solutions or ideas?
If you are running into the same problem as mentioned here, follow the code on this page and read through the comments, it covers enough to be able to piece it together. My mistake was attaching Invokes to the wrong objects.
Don't know why fluent Invoke didn't work correctly.
Add the event handlers this way:
public MainPage
{
var ic = new InputClass();
ic.Clicked += WhenButtonPressedMethod;
Content = new StackLayout
{
Children = { ic }
}
}
public InputClass
{
var button = new Button;
button.Clicked += Button_Clicked;
Children.Add(button);
}
I have a windows form that allows different user controls to show and be hidden by different button.
I would like this user controls to communicate directly with each other and change values etc.
For example usercontrol1 below
User will fill form, then when they click Proceed, usercontrol1 should close and usercontrol2 should now be visible with user information picked and displayed as follows
So far I have the code below
private void btnProceed_Click(object sender, EventArgs e)
{
string name = tbName.ToString();
string email = tbEmail.ToString();
string phone = tbPhone.ToString();
string color = tbColor.ToString();
this.Hide();
UserControl2 u2 = new UserControl2();
MainForm f1 = new MainForm();
f1.panelMain.Controls.Add(u2);
f1.listView1.Items.Add(new ListViewItem(new[]{
name,
email,
phone,
color}));
}
It does not work. Only the usercontol1 is hidden and I'm left with a blank.
What I'm I doing wrong?
(Using visual studio 13 and c# language)
You are adding the new usercontrol to a new instance of MainForm. You can't see it because this new instance is never shown. To avoid this problem in the simplest possible way you pass the instance of the current MainForm to the UserControl constructor, keep that instance stored in a global variable of the UserControl and use that instance when you need to switch the two usercontrols.
In MainForm.cs (when you create the first usercontrol)
UserControl1 uc = new UserControl1(this);
.....
In UserControl1.cs
public class UserControl1
{
MainForm _current;
public UserControl1(MainForm f)
{
InitializeComponent();
_current = f;
}
private void btnProceed_Click(object sender, EventArgs e)
{
.....
UserControl2 u2 = new UserControl2();
_current.panelMain.Controls.Add(u2);
u2.listView1.Items.Add(new ListViewItem(new[]{
name,
email,
phone,
color}));
}
}
This will be problematic to correctly handle for other tasks. I would recommend to redesign your application to let the MainForm decide which usercontrol to show when needed.
In this approach you use events to get informed in MainForm.cs when the user clicks the UserControl1, so you get this in MainForm.cs
UserControl1 uc = new UserControl1();
uc.UserClick += UserAdded;
.....
where UserAdded is a method of MainForm that received the info about the new user though the class UserInfoArgs
public void UserAdded(UserControl1 sender, UserInfoArgs args)
{
sender.Hide();
UserControl2 u2 = new UserControl2();
this.panelMain.Controls.Add(u2);
u2.listView1.Items.Add(new ListViewItem(new[]{
args.name,
args.email,
args.phone,
args.color}));
}
And in UserControl1 you add the delegate, the event and raise the event when you need to communicate to MainForm the info about your new user.
public class UserControl1
{
public delegate void onClick(UserControl1 sender, UserInfoArgs args);
public event onClick UserClick;
....
private void btnProceed_Click(object sender, EventArgs e)
{
UserInfoArgs args = new UserInfoArgs()
{
name = tbName.Text,
email = tbEmail.Text,
phone = tbPhone.Text,
color = tbColor.Text
};
if(UserClick != null)
UserClick(this, args);
}
public class UserInfoArgs
{
public string name {get;set;}
public string email {get;set;}
public string phone {get;set;}
public string color {get;set;}
}
I think using backgroundworker control for this actually works for your case .
private void btnProceed_Click(object sender, EventArgs e)
{
string name = tbName.ToString();
string email = tbEmail.ToString();
string phone = tbPhone.ToString();
string color = tbColor.ToString();
string a = " "+name+" "+email+" "+phone+" "+color;
backgroundWorker1.RunWorkAsync(a);//passing the variables to the backgroundWorker
}
And then in backgroundWorker_doWork(),you can populate the data you're getting as you like .
You are overcomplicating things. You can just layer the two controls on your UI on the same position, and set the second control's Visible property to False.
Make the first user control expose an event for the button's click (or just expose the button so you can access its Click event), so that you can detect that mouse click from the main form. Then, when the listener for that button is called; the main form can get the data out of the first control, use it to initialize the second control, and then hide the first one and show the second one.
I want to make a ColorPicker userControl, and put inside a window.
When the user click in any rectangle of the usercontrol, then I want to return this information to the Window. How can I do this please? Thanks!
Your Color Picker UserControl has to implement an event that is raised every time the user clicks on one of the rectangles of the UserControl. If you don't know how to implement an event, just comment this answer and I give you an example.
Here is the example: You declare your own event args (if needed) to provide some information in the event:
class RectangleClickedEventArgs : EventArgs
{
public int SomeValue { get; set; }
}
In your usercontrol you declare the event:
public event EventHandler<RectangleClickedEventArgs> RectangleClicked;
In some condition you raise the event in this way (the thread-safe way:
var temp = RectangleClicked;
if (temp != null)
{
var e = new RectangleClickedEventArgs{ SomeValue = 42};
temp(this, e);
}
In your form you subscribe the event:
userControl.RectangleClicked += OnRectangleClicked;
And in the event routine you do your desired action:
private void OnRectangleClicked(object sender, RectangleClickedEventArgs e)
{
// Do what you want to do
}
Hope that helps...
I want to close a window form that is hosting a WPF user control. Something like this as used while closing a current form in window application. But for WPF application I am not able to get reference to user controls parent
How to get Form which is hosting this control so that I can close my form
this.Close()
Add to your WpfControl property
public Form FormsWindow { get; set; }
In your WinForm add event handler for ElementHost's event ChildChanged:
using System.Windows.Forms.Integration;
public MyForm() {
InitializeComponent();
elementHost.ChildChanged += ElementHost_ChildChanged;
}
void ElementHost_ChildChanged(object sender, ChildChangedEventArgs e) {
var ctr = (elementHost.Child as UserControl1);
if (ctr != null)
ctr.FormsWindow = this;
}
After that you can use the FormsWindow property of your WpfControl to manipulate window. Example:
this.FormsWindow.Close();
An alternative solution could be,
Window parent = Window.GetWindow(this);
parent.Close();
Just want to add to #The_Smallest's otherwise very clear answer.
If you just copy and past the event handler code, you will still need to set your Forms's ChildChanged event to ElementHost_ChildChanged. I missed that step and spent 30 minutes trying to figure out why FormsWindow was null.
In order to call the Form object of the MyControl class already. We have in it a Form field to which we pass an instance object open Form. Having an assigned object we can freely manipulate it (including also call the function form.Close ();
WPF Control (with XAML):
public class MyControl : UserControl
{
public Form form = null;
public MyControl()
{
InitializeComponent();
this.PreviewKeyDown += new KeyEventHandler(HandleEsc);
}
private void HandleEsc(object sender, KeyEventArgs e)
{
if (e.Key == Key.Escape)
{
form.Close();
}
}
}
Form:
public class MainForm
{
//...
public Form form = null;
public MainForm(MyControl myControl)
{
InitializeComponent();
//...
myControl.form = (Form)this;
}
}