Is there any simple way to make a method that gets called whenever the user clicks out (or changes focus in some other way) from a text box in C#? I'm not really familiar with the way events are handled in C# - I rely on double-clicking a control to automatically generate the btn_Button_Click method.
Thanks!
Try Control.OnLostFocus, which occurs whenever the control loses focus.
You can get a list of events in the properties window for the control. If its not already visible, display the properties window from the view menu. Then select the control you want to add an event to, click the lightning bolt in the properties window (shows events) and add the event you need.
Related
During big files loading I want to disable mouse buttons to unable user to click on UI elements and triggers events.
Edit
When I am loading big size file in my WPF Caliburn Micro application I changed IsEnabled property of Listbox to false, because I want to disable a button during this process.
Next when file is loaded I changed IsEnabled property of Listbox to true.
After that every click on disabled button raised events and I did not want that.
I don't know how to remove this events, and where there are stored, so i thought that the easier way to solve this problem is to disable mouse buttons during file loading process. But it is also not easy...
Thank You in advance!
If you only want to disable mouse buttons, the user can still use the keyboard. So you need a different technique.
You can add a hidden Gird with Opacity="0.5" to your window. When you want to prevent the user from using the window, just call visible the grid.
What about overriding SelectionChanged event on ListBox and setting it to Handled = true when loading big data?
I just want to add simple thing, wherever i click on TextBox I want to delete text that is inside. The thing is I DON'T have in list of events, event called Click.. Is this even possible? Or just I need to install some add on. Buttons are fine, they have Click event.
MouseButtonLeftUp would work if you only are concerned with mouse clicks. With that said, what if someone tabs into the box or focus is entered by other means?
At that point you may want to look at the GotFocus event. Any time the TextBox receives focus, you can handle the event.
TextBox has events called MouseLeftButtonUp and MouseLeftButtonDown, you can use them.
I am making an user interface from windows forms (c#).In my form there are many buttons named enable (for enable each textbox).What i need to do here is when the button relevant to textbox is clicked enable the textbox.(they are not in a groupBox). Without manually coding in each button click's method how can i do this in a programmatic way
Assuming you are trying to bind a textBox's enable property to a button, I would recommend you yo build a simple custom userConrol. Inside that control you will be able to bind the logic of the button to the TextBox. You can then add any number of that specific UserControl to your application and it will automaticly bind your button's logic to the textBox.
I have the next situation:
there is a client app with a Form
the Form contains a few TabControl's
there are different controls on TabPage's of TabControl's
when the user clicks on any control, I need to activate the TabPage that is a parent of a control. For that I use a TabPage Enter event
when the TabPage gets activated, I need to make request to the server app, and I put focus to a hidden TextBox to disable UI
The problem is, when I click on a Button on another TabPage, in TabPage.Enter event handler I take focus to my hidden TextBox, and it seems like Button click event doesn't have enough time to be processed. When I put timer and handle TabPage.Enter event after 100 ms, the Button click event seems to be fired well. Same thing happens to all the controls: CheckBox doesn't get checked, RadioButton too. I wouldn't like to use timer, as that is not a stable solution.
Any ideas how could I make TabPage to process all mouse events before I take focus to hidden TextBox? I tried to use Application.DoEvents(), but that didn't help.
You are using a wrong event for a wrong control for what you are trying to do.
Enter event for TabPage is going to be fired when that page becomes an active control of the current form which might not happen under certain conditions. Instead, you need to use Selecting or Selected event of TabControl, depending on whether you want to cancel switching to a different tab or not (see TabControlCancelEventArgs parameter of Selecting event). In your case, Selecting event would be more appropriate since it won't allow switching to a selected tab until event is complete (unless you're doing an asynchronous request to the server). Additionally, you may no longer need to use the hidden TextBox.
UPDATE
Regarding comments to OP, when you have 2 (or more) TabControls on a form and you want to get notified when you press a button in any tab of a different TabControl, you can use Enter event for TabControl. Use a global variable to store which TabControl was activated in the Enter event and then send server request for a currently active tab of that activate TabControl.
If this doesn't work for your scenario, then you need to carefully examine your workflow and see if it can be improved in relation to what you want to accomplish.
I'm working on a custom user control that essentially displays a name value pair (name is on a black background, value on a white). I have my control displaying correctly, even showing up in Designer and on my build page.
What I'd like to do from here is have the ability to right click on the user control and have a menu come up that has a "Copy Value" option, that when selected will copy the value in the "value" part of the user control to the clipboard. What is the best method of approach?
I'm not sure where to start since most of the documentation on user controls I've found deals with displaying the control, not necessarily interacting with it. Additionally, since I'm still learning C#, I might have left out an important part of my problem in this question, so please point that out if it's the case.
I'm using Visual Studio 2008 (if that matters).
Examine the ContextMenu control and the ContextMenu property of other controls. By assigning a ContextMenu control to the ContextMeny property of another control, you will have the right-click->popup menu wiring done for you. Then you only need to implement the click event of the different menu items in the context menu.
Then you can use the Clipboard.SetText (as suggested by BFree) to set the desired value to the clipboard.
Add a ContextMenu to the control. The, hook into the MouseClick (or MouseDown, whichever works better) event and if it's a Right-Click, then call show on the ContextMenu (there are a few overloads, try to mess with them see which works best for you). Then, in the click event of your context menu, just call Clipboard.SetText(...) to set the value to the clipboard.