I would like to create custom Eventargs for a series of events. I am using a third party X/Y scope where I plot Strength vs frequency. This scope has the ability to place "Markers" on it which are just little triangles at various frequencies. These markers support events such as when the mouse enters the marker, a click is performed, and the mouse leaves the marker. So for two markers, here is the code:
private void createEvents()
{
this.scope2.MarkerGroups[0].Click += new EventHandler(Marker0_Click);
this.scope2.MarkerGroups[0].MouseEnter += new EventHandler(Marker0_Enter);
this.scope2.MarkerGroups[0].MouseLeave += new EventHandler(Marker0_Leave);
this.scope2.MarkerGroups[1].Click += new EventHandler(Marker1_Click);
this.scope2.MarkerGroups[1].MouseEnter += new EventHandler(Marker1_Enter);
this.scope2.MarkerGroups[1].MouseLeave += new EventHandler(Marker1_Leave);
}
// And now the event handlers
private void Marker0_Click(object sender, EventArgs e)
{
//do something;
}
private void Marker0_Enter(object sender, EventArgs e)
{
//do something
}
private void Marker0_Leave(object sender, EventArgs e)
{
// do something
}
private void Marker1_Click(object sender, EventArgs e)
{
//do something;
}
private void Marker1_Enter(object sender, EventArgs e)
{
//do something
}
private void Marker1_Leave(object sender, EventArgs e)
{
// do something
}
Now this is fine for two markers....but I need 80 of them. I could just write the whole thing out but there has to be a better way. So I started like this:
private void createMarkerEvents()
{
for (int i = 0; i < 80; i++)
{
this.scope2.MarkerGroups[i].Click += new EventHandler(Marker_Click);
this.scope2.MarkerGroups[i].MouseEnter += new EventHandler(Marker_Enter);
this.scope2.MarkerGroups[i].MouseLeave += new EventHandler(Marker_Leave);
}
}
private void Marker_Click(object sender, EventArgs e)
{
//do something;
}
private void Marker_Enter(object sender, EventArgs e)
{
//do something
}
private void Marker_Leave(object sender, EventArgs e)
{
// do something
}
So the question is how can I pass the actual marker number from the events to the event handlers?
There has got to be a way.
Thanks, Tom
If you want to identify marker group you may cast object sender to a MarkerGroup object
private void AnyMarker_Click(object sender, EventArgs e)
{
MarkerGroup group = (MarkerGroup)sender;
int indexOfMarkerGroup = this.scope2.MarkerGroups.IndexOf(group);
//do something;
}
OFF: You should define a custom EventArgs class:
public class MyEventArgs : EventArgs
{
public int MyCustomProperty {get;set;}
}
Then use it in your event:
public event EventHandler<MyEventArgs> ButtonPressed;
Fire event using custom args:
if(ButtonPressed != null)
{
ButtonPressed(this, new MyEventArgs { MyCustomProperty = 1 });
}
EDIT
Full example:
private void createMarkerEvents()
{
for (int i = 0; i < 80; i++)
{
this.scope2.MarkerGroups[i].Click += new EventHandler(Marker_Click);
this.scope2.MarkerGroups[i].MouseEnter += new EventHandler(Marker_Enter);
this.scope2.MarkerGroups[i].MouseLeave += new EventHandler(Marker_Leave);
}
}
private void Marker_Click(object sender, EventArgs e)
{
// When markergroup fires and event, it passes reference to itself as `sender` parameter
// so we can get access it
MarkerGroup mg = (MarkerGroup)sender; // this marker has fired a click event
// Now you know which marker has fired event
// if you want to determine it's index in MarkerGroups collection:
int index = this.scope2.MarkerGroup.IndexOf(mg);
// now you know MarkerGroup and it's index
}
private void Marker_Enter(object sender, EventArgs e)
{
//do something
}
private void Marker_Leave(object sender, EventArgs e)
{
// do something
}
Related
I was trying to set up a system to check if the mouse is clicked in a winforms application and have ended up doing this
private void lblChips_MouseDown(object sender, MouseEventArgs e)
{
mouseDown = true;
}
private void lblChips_MouseUp(object sender, MouseEventArgs e)
{
mouseDown = false;
}
eight times over (for each label).
Does anyone know if there's a more efficient way of doing this? I tried using
private void frmGame4_MouseDown(object sender, MouseEventArgs e)
{
mouseDown = true;
}
private void frmGame4_MouseUp(object sender, MouseEventArgs e)
{
mouseDown = false;
}
but that doesnt work. Any help would be greatly appreciated.
this
public Form1()
{
InitializeComponent();
CollectFormControls(this);
ControlList.Add(this);
MergeEvents();
}
List<Control> ControlList = new List<Control>();
private void CollectFormControls(Control c)
{
foreach (Control control in c.Controls)
{
ControlList.Add(control);
CheckSubControls(control);
}
}
private void CheckSubControls(Control control)
{
if (control.Controls.Count > -1)
{
CollectFormControls(control);
}
}
private void MergeEvents()
{
for (int i = 0; i < ControlList.Count; i++)
{
ControlList[i].MouseDown += All_MouseDown;
ControlList[i].MouseUp += All_MouseUp;
}
}
public void All_MouseUp(object sender, MouseEventArgs e)
{
this.Text = "up";
}
public void All_MouseDown(object sender, MouseEventArgs e)
{
this.Text = "down";
}
You could make two methods, one for mouse up and one for mouse down, like this:
private void labels_mouseDown(object sender, MouseEventArgs e)
{
mouseDown = true;
}
private void labels_mouseUp(object sender, MouseEventArgs e)
{
mouseDown = false;
}
Then, link all the labels to these methods. You can also do this from Code:
label.mouseDown += labels_mouseDown;
label.mouseUp += labels_mouseUp;
This has to be done somewhere under the InitializeComponent(); method. You still have to do this for every label but in the end it's less code.
I'm making a little something in Windows Form (C# Visual Studio)
But I need to know how I can set an int and then to use it in another event. For example, :
private void BtnYes_Click(object sender, EventArgs e)
{
int yes = 1;
int no = 0;
timer1.Start();
}
private void timer1_Tick(object sender, EventArgs e)
{
if (yes == 1) {
//EVENT
}
}
When I do this I get some errors. Can anyone help me with this? Or just tell me how to do something like this using a different technique?
U need to use a field for this:
private int _yes;
private void BtnYes_Click(object sender, EventArgs e)
{
_yes = 1;
int no = 0;
timer1.Start();
}
private void timer1_Tick(object sender, EventArgs e)
{
if (_yes == 1) {
//EVENT
}
}
The variable "yes" you are declaring is only visible in the scope of the method. By making it a field of class, this would make it visible to all methods in the class (when private).
class YourClass
{
private int yes = 1;
private int no = 0;
private void BtnYes_Click(object sender, EventArgs e)
{
//Remove the type declaration here to use the class field instead. If you leave the type declaration, the variable here will be used instead of the class field.
yes = 1;
no = 0;
timer1.Start();
}
private void timer1_Tick(object sender, EventArgs e)
{
if (yes == 1) {
//EVENT
}
}
}
In my code I want to perform some actions when some controls are focused. So instead of having one handler for each control i was wondering if there could be any way of adding all controls to the handler and inside the handler function perform the desired action.
I have this:
private void tb_page_GotFocus(Object sender, EventArgs e)
{
tb_page.Visible = false;
}
private void tb_maxPrice_GotFocus(Object sender, EventArgs e)
{
tb_maxPrice.Text = "";
}
private void tb_maxPrice_GotFocus(Object sender, EventArgs e)
{
tb_maxPrice.Text = "";
}
I want this:
private void AnyControl_GotFocus(Object sender, EventArgs e)
{
if(tb_page.isFocused == true)
{
...
}
else if (tb_maxPrice.isFocused == true)
{
...
}
else
{
...
}
}
Is this possible? How could I do it? Thanks a lot.
Iterate your controls in your form or panel and subscribe to their GotFocus Event
private void Form1_Load(object sender, EventArgs e)
{
foreach (Control c in this)
{
c.GotFocus += new EventHandler(AnyControl_GotFocus);
}
}
void AnyControl_GotFocus(object sender, EventArgs e)
{
//You'll need to identify the sender, for that you could:
if( sender == tb_page) {...}
//OR:
//Make sender implement an interface
//Inherit from control
//Set the tag property of the control with a string so you can identify what it is and what to do with it
//And other tricks
//(Read #Steve and #Taw comment below)
}
I got an array which contains 5 comboboxes. I want to create a void for the event "SelectionChangeCommitted" for the whole array which can determine which combobox the void was called from. Here is the current code which contains 5 voids. One for each one of the comboboxes.
private ComboBox[] statsValues;
public frmMain()
{
InitializeComponent();
statsValues = new ComboBox[5];
for (byte b = 0; b < statsValues.Length; b++)
{
statsValues[b] = new ComboBox();
statsValues[b].Location = new System.Drawing.Point(69, 193 + 30 * b);
statsValues[b].DropDownStyle = ComboBoxStyle.DropDownList;
}
Controls.AddRange(statsValues);
statsValues[0].SelectionChangeCommitted += new System.EventHandler(cmbSTR_SelectionChangeCommitted);
statsValues[1].SelectionChangeCommitted += new System.EventHandler(cmbDEX_SelectionChangeCommitted);
statsValues[2].SelectionChangeCommitted += new System.EventHandler(cmbCON_SelectionChangeCommitted);
statsValues[3].SelectionChangeCommitted += new System.EventHandler(cmbINT_SelectionChangeCommitted);
statsValues[4].SelectionChangeCommitted += new System.EventHandler(cmbWIS_SelectionChangeCommitted);
}
private void cmbSTR_SelectionChangeCommitted(object sender, EventArgs e)
{
//Code...
}
private void cmbDEX_SelectionChangeCommitted(object sender, EventArgs e)
{
//Code...
}
private void cmbCON_SelectionChangeCommitted(object sender, EventArgs e)
{
//Code...
}
private void cmbINT_SelectionChangeCommitted(object sender, EventArgs e)
{
//Code...
}
private void cmbWIS_SelectionChangeCommitted(object sender, EventArgs e)
{
//Code...
}
And I want to create a single void for all of them which can determine which combobox it was called from.
Assuming that 'a void' means 'an eventhandling method',
private void cmbALL_SelectionChangeCommitted(object sender, EventArgs e)
{
ComboBox thisOne = (ComboBox)sender;
//Code...
}
I greatly appreciate any help. I have 20+ buttons, each with a word, or a space or period. Each time I click on a button, the pre-existing word is wiped out and replaced with the new word. I need each word and/or space to remain in place until I click the "Clear" button.
Maybe this has been previously asked/answered under different search terms? I tend to believe I need to identify a string variable, but have no idea how to begin.
==============
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class frmSentenceBuilder : Form
{
public frmSentenceBuilder()
{
InitializeComponent();
}
private void frmSentenceBuilder_Load(object sender, EventArgs e)
{
}
private void btnA_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnA.Text;
}
private void btn_a_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btn_a.Text;
}
private void btnAn_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnAn.Text;
}
private void btn_an_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btn_an.Text;
}
private void btnThe_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnThe.Text;
}
private void btn_the_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btn_the.Text;
}
private void btnman_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnman.Text;
}
private void btnwoman_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnwoman.Text;
}
private void btndog_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btndog.Text;
}
private void btncat_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btncat.Text;
}
private void btncar_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btncar.Text;
}
private void btnbicycle_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnbicycle.Text;
}
private void btnbeautiful_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnbeautiful.Text;
}
private void btnbig_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnbig.Text;
}
private void btnsmall_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnsmall.Text;
}
private void btnstrange_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnstrange.Text;
}
private void btnlookedat_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnlookedat.Text;
}
private void btnrode_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnrode.Text;
}
private void btnspoketo_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnspoketo.Text;
}
private void btnlaughedat_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnlaughedat.Text;
}
private void btndrove_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btndrove.Text;
}
private void btnSpace_Click(object sender, EventArgs e)
{
lblSentenceText.Text = " ";
}
private void btnperiod_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnperiod.Text;
}
private void btnexclam_Click(object sender, EventArgs e)
{
lblSentenceText.Text = btnexclam.Text;
}
private void btnClear_Click(object sender, EventArgs e)
{
lblSentenceText.Text = "";
}
private void btnExit_Click(object sender, EventArgs e)
{
this.Close();
}
}
}
Use lb1SentenceText.Text+=whatever.Text;.
+= is equivalent to lbSentence.Text = lblSentenceText.Text + whatever.Text.
Basically, it appends or concatenates the right hand side string to the string on the left hand side. Hope it makes sense?
So:
string rhs="Hello " ;
string lhs = "World";
string rhs = rhs + lhs;//Hello World
Please be inspired. You have a lot of redundant code.
btnA.Click += AppendButtonText;
btn_a.Click += AppendButtonText;
...
private void AppendButtonText(object sender, EventArgs e)
{
var button = sender as Button;
if (button != null)
{
lblSentenceText.Text += button.Text;
}
}
On the button click events, change it to += instead of = (except in the clear button). This is equivalent to writing something = something + newValue;.
Try:
lb1SentenceText.Text = lb1SentenceText.Text + *something*.text
The += operator means add to, and the variable modified is equal to the added (Int, String) appended to the original value (x = 1; x += 3; x is now 4)
Try this:
button.Click += new System.EventHandler(ButtonClick);
button1.Click += new System.EventHandler(ButtonClick);
// And for each button, one of those.
private void ButtonClick(object sender, System.EventArgs e)
{
// Do whatever you want to do here, you can place the TEXT to be appended on the button, if so:
lb1SentenceText.Text += sender.Text;
}
//Simple.Create a global variable and within each button click event do this;
string yourStrVar = ""; //Must be global
yourStrVar+= ((Button)sender).Text