I have a CompositeControl with 3 buttons, and I don't want to have these buttons as public members from my CompositeControl. But I also want to expose their Click event individually so the user of this control can subscribe to them.
I am not sure how to do this without duplicating the same events in my control and raising each button's Click event separately.
I am not sure how to do this without duplicating the same events in my control and raising each button's Click event separately.
This is really the proper way to handle this. You will want to duplicate the event, but give it a new, proper name.
Typically, this means exposing the "click event" with a name that's related to the activity of the button, not the button itself. For example, if you had a refresh button, I'd expose the event as something like:
public event EventHandler RefreshRequested;
Then, internally, you'd listen to the button's click event and raise the refresh requested event. This also provides you the flexibility, later, to change the internal representation (if you wanted to use something other than a button, for example).
Related
I have a Windows Forms application and I want to be able to show a 'post-it note' type thing when the user does a specific action.
For example: The user does something which automatically hides a control.
My application should:
o Pop up a post it note which explains what happened.
o Hide the post it note again when the user clicks anywhere on the form.
I have implemented the post it note as a simple panel with a label in it, which shows and hides when specific things happen.
However, I can't seem to capture the OnClick event of the parent UserControl. The parent control is a nested control, containing a split container, one side of which contains the panel and a tab control, each of which contains a user control with various things in it.
Apart from handling the click event of every single child control, can anyone think of an event that I can capture on the parent control that I can use to hide the post it note when the user clicks anywhere in the parent control?
Thanks,
Rik
That's what the Capture property was designed to do. Set it to true when you pop up the note. Any mouse events will now be directed to your control, even if the mouse moves outside of the window. This is also the way that, for example, the combobox dropdown list works. Keep in mind that it is only good for one click.
If the popup contains any controls itself then mouse capture isn't the solution. Make it an owned form instead and simply call Close() in an event handler for the Deactivate event.
There is bubling of events in windows form, while you click on child event, the event is raised for child, and then for parent. Unless you specify "handleEvnet" property to true. So just leave it false, untill event reaches parent.
I have a custom control that can be added multiple times to a form. There can be multiples occurrences of this custom control on the same form. These controls are added and removed by the user. The user can right click on some control inside the custom control to reveal a menu.
When selecting an item from this menu, an event should be raised on the form. I made a custom event and realized that it could't be usable if the control was added dynamically, because the form doesn't know it. I can't add an event handler referring to a control that doesn't exist. Is there some other way to raise an event on the form from custom control that doesn't require the form to know it? By the way, my custom controls are added to a FlowLayoutPanel.
Thanks for the help!
You just wire up the event handler in the code when you add the control e.g.
MyButton.Click += ButonClickEventHandler;
Page.Controls.Add(MyButton)
Agree with Ben - otherwise, there are messy ways of doing it (depending on how your control is set up). For example INotifyPropertChanged Inerface or through Windows API messaging (and listener) - but unless you have a very strange set up, then as Ben said, simply add a handler when you add the control. You can always use a generic callback method and use custom event args to identify which has triggered it.
This one is a bit tricky to explain.
I have a usercontrol with some textboxes. I also have a menu just above this usercontrol in the same window. Whenever I tab away, the LostFocus fires correctly on the textbox, and this is what I want. Strangely enough, if I click the Menu button on top of my window, the LostFocus event does not fire on the textbox. Is there an elegant way to make sure that my menu properly allows LostFocus to fire on any controls which last had focus?
I also want to avoid having to Update BindingExpressions otherwise I would likely be doing this for N textboxes, which is undesirable.
I can't imagine it is too difficult to achieve this.. I just don't understand how this doesn't work: in most other situations LostFocus always fires.
Any ideas? Thank you.
Is the menu WPF as well or Winforms / UnManaged? If either of the two then the lost focus event does not fire. This can play havoc with WPF controls as many time a save or other data function is being performed from the menu. To counter this I have had to implement multiple ways to combat this. The easiest way was to implement a mouse leave event on the user control itself and perform any actions you require manually in code.
i'm doing a webshop in asp.net (c#).
Is there a way to push the edit button in the gridview through the code of c#?
I have a "new" button, that just adds the row, it would be great if that same row would "open" itself for editing without user having to press "new" then "edit"...
I know there are other ways to do this, i just want to know if this is possible... it would save tons of time!!
thanks in advance for the anwsers!!
Andrej
Just call the event handler you wrote to handle the edit button push.
Basically speaking, all that happens in code when you click a button is that the button's Clicked event is raised. In a GridView, the event is actually something like GridViewButtonClick. However many handlers you have plugged in will then execute (and you can't, and shouldn't have to, control the order of execution). For a built-in button, because you cannot raise the event from outside that button, you can simulate the button click by just calling the handlers you have attached to the event. If this were your own custom control, you could define a method you could call from outside that would cause the control to raise a certain event.
I want to understand event cycles. I have a form with a grid and textboxes. It has a grid, bound to DataTable, and textboxes bound to same table too. I'm trying to debug something and need to know how to identify ALL events fired in the form to see what may solve an issue for me.
Anyhow, unless I explicitly subclass every class on my form, and override / attach to every event to my own event handlers, how can I get / listen to all events being fired during a certain action... Such as changing a "Selected" road in a DataGridView. It obviously updates its own "CurrentRow"... I need to know what / how to maybe FORCE a re-loading of SAME CurrentRow.
Reason: during a form level "Edit Mode", and I change the content in another "Textbox" control, and reject changes, I need it to simulate the current "Record" is reloaded to go back to its original values.
You could fire up a profiler and look at the method call tree.