I currently have a tabcontrol on my windows form in visual studio, i would like it so that when the user clicks on a different tab that i can execute some code (for example populate a listbox).
when i double click on the tab it only brings up an onclick event for the body of the tabcontrol.
i was thinking that i may have to create a thread in the form load that will constantly check whether the tab index changes and if it does then execute some code. but surely there must be an easier way?
You can use TabControl.Selecting or TabControl.SelectedIndexChanged event
private void tabControl1_Selecting(object sender, TabControlCancelEventArgs e)
{
//Your code goes here.
}
You should look at TabControl events
http://msdn.microsoft.com/en-ie/library/system.windows.forms.tabcontrol.selecting.aspx
Related
I'm having a Windows Mobile CE application written in C# with .Net CF.
Consider i have 2 forms in my application:
List of objects (has a listview)
Details page (should appear when something is selected in previous listview)
Currently i'm attaching callback to listview's SelectedIndexChanged event, and open a new form there.
New form opens okay (in the midde of the event callback), but when i close the form(this.Close()), then the list page isn't clickable first time, after the first click UI is interactable again.
Also the the ListViewItem clicked at first step doesn't get selected(blue background).
Here's a short (12s) video showing this problem: http://take.ms/urkme
As you see from the video, after coming back from details screen, refresh button doesn't click on the first click..
I'm showing the details form like so:
private void listView_SelectedIndexChanged(object sender, EventArgs e)
{
(new FormDetails()).ShowDialog();
}
Is there any way to show the details form after event finishes, or am i doing it completely wrong?
PS! Tried the same with a Button and it's click event, then all worked nicely..
As I know ListView's SelectedIndexChanged event fired twice on almost case not like Button's Click event which fired once, this maybe what cause that weird interaction. Maybe try changing to ItemSelectionChanged event as suggested in here.
Your problem is caused by using the SelectedIndexChanged event. When you select an item in your list you'll set the SelectedIndex, if you select the same item again the index won't be changed so you'll never call the event.
You could use the Click event to trigger the wanted response.
Here is an example:
private void listView1_Click(object sender, EventArgs e)
{
var firstSelectedItem = listView1.SelectedItems[0]; //This is your selected item.
//do stuff
}
When you use ShowDialog() you open a form in modal mode. All further processing of following code will not take place until the modal form is closed or returns a DialogResult.
Better use a modeless form using .Show().
private void listView_SelectedIndexChanged(object sender, EventArgs e)
{
(new FormDetails()).Show(); //will not stop processing of events in mainForm
}
If the new FormDetails is finished, it can use a simple Hide or Close to bring up the main form to foreground.
Remember that the main form is still there and will not wait for the FormDetails being closed (as it is a modeless dialog).
It seems like a straight forward thing, but I can't figure it out.
How can I check if a certain button was clicked from user control?
my user control is uc_test and button name is btnTest .
I assume its some sort of event handler added to uc_test.btnTest ?
I'm working in WinForms.
It sounds like you've created a button but want to make it do something on click. I don't often use Winforms but from memory double-clicking on the control in the form should automatically create a btnTest_Click method. If not, just go to code and put in a method like:
protected void btnTest_Click(object sender, Eventargs e)
{
//do something
}
Then set in the properties of the button the OnClick event to btnTest_Click.
I am making a Program, which has two checkboxes in a windows form. The first CheckBox is for clearing a file, the other for printing it out. But the final selection, the starting of the method is a button. I wanna make something like an if-statement like "if checkbox1 is clicked do this and this". But it should be fired by the Button.
You can do this in button's event:
if (checkbox1.Checked)
{
//Do something
}
In Visual Studio, while editing the form in the visual designer, if you double click on the button, you'll be taken to the code file. It'll have generated a method for you, called (name of your button)_Click (object sender, EventArgs e). It will also be bound to the button click automatically. Just put your code in there.
I am having a strange problem with the .NET TabControl in C# (Visual Studio 2010). Start a Windows Forms Application. Add a tab control and a button. Add two different labels to the two tab pages so you can differentiate them. The purpose of the button is just to act as a next button; subscribe to the its Click event with the code:
tabControl1.SelectTab(1);
Let's assume the user entered something wrong on the first tab, so when they try to go to the second tab we want to send them back, so subscribe to the tab control's SelectedIndexChanged event with the code:
if(tabControl1.SelectedIndex == 1)
{
tabControl1.SelectTab(0);
}
Now run the program and click the button. You will notice that as judged by the highlighted tab at the top, the first tab page is the one that appears to be selected, as you'd expect. However, as judged by the tab page that actually appears in the body of the tab control, it's still the second tab page that shows up! Calls to various controls' Focus(), Update(), and Refresh() functions don't seem to help. What is going on here?
I repro. This is a generic problem with event handlers, you can confuse the stuffing out the native Windows control by jerking the floor mat like that. TreeView is another control that's very prone to this kind of trouble.
There's an elegant and general solution for a problem like this, you can use Control.BeginInvoke() to delay the command. It will execute later after the native control is done with the event generation and all side-effects have been completed. Which solves this problem as well, like this:
private void tabControl1_SelectedIndexChanged(object sender, EventArgs e) {
if (tabControl1.SelectedIndex == 1) {
this.BeginInvoke(new Action(() => tabControl1.SelectTab(0)));
}
}
I am using C# and winForms, I have a few tabcontrols, which contains a few tab pages,
I would like to add all tab pages my user control, it would be best, If I could add it after user click on tab page. It works for me only, when I add this controls in constructor - what makes delay at application start - about 3 seconds, what is very much.
I would like to add this controls at run time, like
tabPage1.onClickEvent()
{
tabPage1.Controls.Add(myUserControl);
}
but it didnt works, I also tryied to use Invalidate, or Refresh method but it not works.
So is there any possibility to add this userControls in other method than constructor?
Maybe its problem, that I have TabControl inside TabControl and I have to add this controls throught parent TabControl?
Thanks!
Try double clicking the tag page in the designer, or you can add the event handler manually like this:
tabPage1.Click += new EventHandler(tagPage1_Click);
I don't know whether tabPage1 is dynamic, but if it's not, you should add the above event handler to your designer.cs file.
Here is the event handler in the code:
protected void tabPage1_Click(object sender, EventArgs e)
{
tagPage1.Controls.Add(new TextBox());
}