Please forgive me if this should be phrased differently in a programming context - I have no idea what to search for other than exactly what I used to title my question.
Context - I am attempting to build a word search game involving a 4x4 grid of random letters. I'm currently using a Label_Click event to change the background color of the label containing a given letter. In the future there will be many other actions than just this (evaluating whether an array of clicks forms a legitimate word, for instance), but I'm fundamentally stuck with this problem:
// pseudo-code
if (lblA1_wasClicked || lblB1_wasClicked || ... lblD4_wasClicked)
{
whichever_wasClicked... //perform actions
}
Perhaps I need to learn about creating an event handler for this situation? I have never created a custom event handler, I just know what they are in theory. I am kind of stuck and at this point it's tough to know what to search for to keep learning. I know only enough to be dangerous, so please go easy on me if the answer is as straight-forward as my question feels. :)
If you are in the ui, you can go to the properties of each label and set their Click handler to the same method. so if you have a method with a signature like this.
public void label_Click(object sender, EventArgs e)
{
}
Then assign that to each label and then use that to process each one. This is a naive example, and there are much better methods that use established patterns for creating windows forms applications. Check out this question or search for MVP pattern windows forms to get more info on it!
Related
At the moment i'm working with Caliburn Micro. But i got to a problem which i don't know how to solve.
The problem is i want to disable Buttons, but every website has only a solution with propertys. the functions of my buttons for example just start a thread to establish a connection over tcp with Netmq. So i don't know how i'll be able to disable them. Searched a lot through google but didn't find anything helpful.
Example of a button function
public void startPubButton()
{
Thread entryThread = new Thread(startPublisher);
entryThread.IsBackground = true;
entryThread.Start();
}
is there maybe a possibility to enable the Buttons only when the thread runs ?
That is the one premise behind CM wiring up by convention all you have to do is provide a CanstartPubButton Boolean property run a code check to see if you can enable or disable button according to the logic with that guard property. Call with NotifyOfPropertyChange(() => CanstartPubButton); in some fashion to do what you want. The logic with in the property (get only needed) is up to you. one other thing I will drop on you is a thread presently in the GitHub discussions on the repository itself. Might help and it might not
https://github.com/Caliburn-Micro/Caliburn.Micro/issues/422
I am a beginner in c# programming and I am developing windows phone application after reading some tutorials.
My idea is when the user clicks a button in a windows page, some other button in other windows phone page must change color from red to green.
Pardon me if I am too Basic.
This I have defined in a page named "IndexPage.xaml"
<Button x:Name="One_green"
Content="1"
Background="Green"
Click="One_Click"
/>
<Button x:Name="One_red"
Content="1"
Background="Red"
Click="One_Click"
/>
Now I see red color button in my window as green button is hidden in the back.
Now, the following code is from another windows phone page "1.xaml"
<Button Content="GO" Click="Button_Click"/>
Now when the user clicks the "GO" Button I want the button to change to red to green in "IndexPage.xaml". So I tried a code something like this in "1.xaml.cs"
private void Button_Click(object sender, RoutedEventArgs e)
{
One_red.Visibility = Visibility.Collapsed;
One_green.Visibility = Visibility.Visible;
}
But I am not able to access the "One_red" or "One_green" button in the above code. Please shed me directions.
Also I want that code to execute only once. (i.e.) when the IndexPage.xaml loads again I want that button to be green always.
Thank you very much in advance.
Please tell me if some other details are required.
You could define a public or internal static variable inside the "Index.xaml" class specifying what button will show on load until otherwise specified. This variable could be accessed outside the class, and possibly even outside the project depending on the modifier chosen. The constructor of the "Index.xaml" class could have code to reset it to the default to ensure it only happens on the next creation of the page. If you aren't creating a new page everytime, you would have to put the default resetters in a method called when you want to bring it to foreground.
It seems to me that you are trying to learn, rather than having a SPEC to follow and implement.
Because of that, and because you are starting with C# in 2014 (almost 2015),
it will be quite beneficial for you to jump straight to data-binding declarative over imperative, going MVVM (MVVx) over MVC (MVx).
XAML was designed around this pattern. It's the natural way of doing things in XAML, a perfect fit and the perfect platform to learn the pattern.
It requires lots of learning, thinking, and re-learning, but it will open your eyes to modern programming techniques.
That said... there are too many ways of doing what you asked for, and while none are exactly wrong, there are 2 current trends in .Net/C#/MsTech which IMO are NOT a waste of your time:
Functional Reactive Programming and OOP/MVVx (the x is for whatever).
Examples are ReactiveUI, Reactive Extensions, PRISM, Caliburn.Micro and many more. They can be combined, the same way you can combine traditional event-driven/event callbacks with MVVM and/or Reactive Programming. However, I would advise against it.
I'll start with the most documented way.
Look at Data binding for Windows Phone 8. It was the first result when I googled "windows phone 8 xaml data binding," and deals with Colors and controls.
If you follow that example and add a resource to your application, you are done.
Of course, you can still use event => onClick + static class to hold the value in between View instances, but if I was right on the assumption that you are trying to learn, I wouldn't go that route.
Sorry if I drifted. :)
You may not be able to access the button click event because it is private, you may need to make it protected or public, the default access specifier would probably be ok as well.
public void Button_Click(object sender, RoutedEventArgs e)
or default would be:
void Button_Click(object sender, RoutedEventArgs e)
I'm building a "WPF Application" which is made to be run in the background (minimised state) and detects KeyStrokes of each and Every key on the keyboard & every Mouse Clicks.
So, my question is how to detect every keyStrokes whether app (Window) is minimised or not.
Simply, if my app is in focus then i use this code to count keystrokes.
Public int count;
protected override void OnKeyDown(System.Windows.Input.KeyEventArgs e)
{
//base.OnKeyDown(e);
count++;
tBlockCount.Text = count.ToString();
}
I just want to do the same even if my app is minimised.
I've searched a lot and come across many suggestions like..
http://www.pinvoke.net/default.aspx/user32/registerhotkey.html
http://social.msdn.microsoft.com/Forums/vstudio/en-US/87d66b1c-330c-42fe-8a40-81f82012575c/background-hotkeys-wpf?forum=wpf
Detecting input keystroke during WPF processing
Detect if any key is pressed in C# (not A, B, but any)
Most of those are indicating towards Registering HotKeys. But I'm unable to match scenario with mine.
Any kind of suggestion are most welcome.
Although I'm not really condoning the use of a keylogger (This is what you are trying to do). I would recommend taking a look at this q/a, the section near the bottom of this article, and this article for some inspiration. These should help point in the right direction for the coding side.
What you essentially need to do is just set up an event to intercept any keys that come in from the computer, then you can gather the key and do whatever you like with it (in your case, record it)
Edit: In fact, reading the third article, it actually gives a full code snippet on how to implement and use it in WPF, so I recommend just reading that one.
I am implementing drag and drop functionality among lables. I want to find the ID of a dragged control like label, button, etc so that I can assign a text to it.
I am not sure how to get that data through the events. Any suggestion will help.
you can use Drag_Enter and DragOVer Events, to achieve the goal DragEnter Doucmentation
and DragOver Documentation
alternativily you can check following tutorials
Code project : Drag and Drop in Windows Forms
Code Project : Drag and Drop UI in WinForms
check out System.Windows.Forms.DragEventArgs e
void MyControl_DragDrop(object sender, DragEventArgs e)
{
var controlBeingDrag = (Label)sender; // cast from object
string[] files = (string[])e.Data.GetData(DataFormats.FileDrop, false);
}
the control sending drag event is object sender
Assuming you've done your research to figure out how to do drag and drop of controls on your form (and your question is really only limited to your question title: How to find the id of dragged control) most standard WinForm events provide a parameter (object sender) which represents the control used to invoke the event. You should be able to get its ID as you would normally.
Apparently it is less obvious how to consistently get the ID from a WinForm control. Luckily, Brian McMaster has a (fairly old meaning only possibly relevant) MSDN blog post for doing just that. In .NET 3.5 I'd probably use this old post as the start to an extension method for control objects.
If your question is broader than that then you may benefit from #Ravi's links, but on SO we generally expect that you do your own research. Please be sure to do so before asking questions.
Question:
How can I detect and handle clicks on hyperlinks in a Windows.Forms.WebBrowser control in C#?
Background:
My C# application does not carry a centralised help file. Instead, all the pieces that make up the app are allowed to display their own little help topic. This was done because the application is merely a framework, and it's hundreds of little plug-ins that actually make it useful.
Each class can implement an interface which registers it with the help UI. All my help topics are html strings (but I'm not particularly wedded to that), many of which are created programmatically at runtime.
The problem is that these topics are all isolated. I'd very much like to be able to include a "See also" section which will open other help topics. But how can I handle hyperlink-clicks in a Windows.Forms.WebBrowser?
Much obliged,
David
If I understand correctly, you would like to override your hyperlink-clicks with your own Form or UI. Well, if that's the case, you put your code on the OnNavigating event of Web Browser and make e.Cancel = true so that it will not navigate the URL specified by your hyperlink.
some snippet:
private void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e)
{
e.Cancel = true;
SeeAlsoFrm seeAlso = new SeeAlso();
seeAlso.showDialog();
}
that is based on my understanding. :)=)