Imagine this application in Vb.net, I have 2 panels and several buttons. I am moving buttons from a panel to other panel (through catching drag and drop events). I reached it.
Now I am trying the following:
Is there any way to raise an event from a panel when this panel loses some child button (or control)?
Thanks in advance.
Try this event when a control has added to the panel :
Private Sub Panel1_ControlAdded(ByVal sender As Object, ByVal e As System.Windows.Forms.ControlEventArgs) Handles Panel1.ControlAdded
End Sub
And this when a control has removed :
Private Sub Panel1_ControlRemoved(ByVal sender As Object, ByVal e As System.Windows.Forms.ControlEventArgs) Handles Panel1.ControlRemoved
End Sub
The panel control doesn't seem to have an event that fires when its child control collection changes. source
The best thing to do would be handle this as part of the drop event. Presumably you have some code to determine if the button is to be moved. If this is true, call a function to do everything you want when a panel loses a control.
Related
I am trying to show some hidden columns in a telerik RadGridView when the Form Window is Maximized.
I am aware of Resize Event but since Resize event is fired even before the Form is loaded, I am not using it.
I found that ResizeEnd suits my need but it is not reacting to Maximize button.
Is it possible to fire it with Maximize button.
Thanks.
since Resize event is fired even before the Form is loaded
Then add the handler in FormLoad instead of the designer
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
AddHandler Control.ResizeBegin, AddressOf controlResizeBegin
End Sub
Private Sub controlResizeBegin(sender As Object, e As EventArgs)
End Sub
In my program (Winforms), i use usercontrols as pages. I do this in the following way:
I have a panel on my Form1 in which i load usercontrols, on these usercontrols are my actual controls (buttons, labels, checkboxes etc). So actually i'm using the user controls as "sub" pages in my form.
The usercontrols are declared at the start of runtime, so they are "live" when i load them into the panel. This has allways worked fine, untill i ran into a problem yesterday.
Yesterday I used a datagridview on one of those usercontrols and during the ParentChanged of this control i call a Sub which changes the backcollor of this data grid view. (The sub itself is a public sub which is located in a module)
Like this:
Private Sub Init_ParentChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.ParentChanged
GetRecipe(RecipeDGV, "Bla")
End Sub
Public Sub GetRecipe(ByVal Data As DataGridView, ByVal RecipeID As String)
For r As Integer = 0 To Recipe_Mem.Rows.Count - 1
For c As Integer = 0 To Recipe_Mem.Columns.Count - 1
Data(c, r).Style.BackColor = getPresetColorByID(CInt(Data(c, r).Value))
Data(c, r).ToolTipText = getPresetNameByID(CInt(Data(c, r).Value))
NEXT
NEXT
End Sub
When i run my program, i can see that my dgv gets the data from the database (which happens in the same Sub). But there is no color change in the cells.
Now, something i've noticed is that when i add a button to the user control, and use the click event of this button to call the same sub for the coloring, it does work).
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
GetRecipe(RecipeDGV, "Bla")
End Sub
Any idea why this works on a button click event, but it doesn't in the usercontrol parent changed event? it looks like during the parent changed event there is some kind of repaint event of the dgv. how do i solve this?
Have you tried wrapping the gridview in an ajax control ( with triggers on the ParentChanged event?
I'm a little puzzled by the "RecipeID" argument being passed as it isn't used.
I developed a userControl that reacts on the MouseWheel and KeyDown event.
Dragging this userControl multiple times onto the same form I recognized that the problem was that only the first userControl reacts on the MouseWheel and the KeyDown event the others do nothing.
What must I do to solve this problem and each of the controls reacts on the MouseWheel and KeyDown effect even it becomes the focus.
Can anyone please provide a solution in VB.Net or C#?
I believe you want to place each control in one event handler separated by a comma like so:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click, Button2.Click
' Add event-handler code here.
End Sub
You can read more about it here: http://msdn.microsoft.com/en-us/library/3exstx90(v=vs.110).aspx
I have a gridview that is populated and a button outside the gridview that I want to enable editing on the selected row when clicked. I have this in the code behind. What goes in the btn_click event to invoke the grid view editing?
Protected Sub GridView1_RowEditing(ByVal sender As Object, ByVal e As GridViewEventArgs)
GridView1.EditIndex = e.NewEditIndex
FillGrid()
End Sub
Protected Sub btnEdit_Click(ByVal sender as Object, ByVal e As System.EventArgs) Handles btnEdit.Click
What goes here??
End Sub
There is a problem with this approach.
"GridView1_RowEditing" is expecting a row index, so it can turn on "EditItemTemplate" accordingly, correct?
But If you want to click on button outside of Gridview and make entire Gridview editable, you shouldn't trigger GridView1_RowEditing, since you don't know what editindex to pass.
You need to implement editable control(textbox) as part of "ItemTemplate", not in "EditItemTemplate".
And visibility of this control would be controlled by the outside button you have created, which will flag the visibility on / off.
Please review following link, this demonstrates how it should be implemented.
http://highoncoding.com/Articles/219_GridView_All_Rows_in_Edit_Mode.aspx
I've 100 buttons created dynamically in a form. How can I an add event handler to them?
You can use AddHandler to add a handler for any event.
For example, this might be:
AddHandler theButton.Click, AddressOf Me.theButton_Click
Just to round out Reed's answer, you can either get the Button objects from the Form or other container and add the handler, or you could create the Button objects programmatically.
If you get the Button objects from the Form or other container, then you can iterate over the Controls collection of the Form or other container control, such as Panel or FlowLayoutPanel and so on. You can then just add the click handler with
AddHandler ctrl.Click, AddressOf Me.Button_Click (variables as in the code below),
but I prefer to check the type of the Control and cast to a Button so as I'm not adding click handlers for any other controls in the container (such as Labels). Remember that you can add handlers for any event of the Button at this point using AddHandler.
Alternatively, you can create the Button objects programmatically, as in the second block of code below.
Then, of course, you have to write the handler method, as in the third code block below.
Here is an example using Form as the container, but you're probably better off using a Panel or some other container control.
Dim btn as Button = Nothing
For Each ctrl As Control in myForm.Controls
If TypeOf ctrl Is Button Then
btn = DirectCast(ctrl, Button)
AddHandler btn.Click, AddressOf Me.Button_Click ' From answer by Reed.
End If
Next
Alternatively creating the Buttons programmatically, this time adding to a Panel container.
Dim Panel1 As new Panel()
For i As Integer = 1 to 100
btn = New Button()
' Set Button properties or call a method to do so.
Panel1.Controls.Add(btn) ' Add Button to the container.
AddHandler btn.Click, AddressOf Me.Button_Click ' Again from the answer by Reed.
Next
Then your handler will look something like this
Private Sub Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
' Handle your Button clicks here
End Sub
#Debasish Sahu, your answer is an answer to another question, namely: how to know which button (or any other control) was clicked when there is a common handler for a couple of controls? So I'm giving an answer to this question how I usually do it, almost the same as yours, but note that also works without type conversion when it handles the same type of Controls:
Private Sub btn_done_clicked(ByVal sender As System.Object, ByVal e As System.EventArgs)
Dim selectedBtn As Button = sender
MsgBox("you have clicked button " & selectedBtn.Name)
End Sub
I needed a common event handler in which I can show from which button it is called without using switch case... and done like this..
Private Sub btn_done_clicked(ByVal sender As System.Object, ByVal e As System.EventArgs)
MsgBox.Show("you have clicked button " & CType(CType(sender, _
System.Windows.Forms.Button).Tag, String))
End Sub
Some code for a variation on this problem. Using the above code got me my click events as needed, but I was then stuck trying to work out which button had been clicked.
My scenario is I have a dynamic amount of tab pages. On each tab page are (all dynamically created) 2 charts, 2 DGVs and a pair of radio buttons. Each control has a unique name relative to the tab, but there could be 20 radio buttons with the same name if I had 20 tab pages. The radio buttons switch between which of the 2 graphs and DGVs you get to see. Here is the code for when one of the radio buttons gets checked (There's a nearly identical block that swaps the charts and DGVs back):
Private Sub radioFit_Components_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
If sender.name = "radioFit_Components" And sender.visible Then
If sender.checked Then
For Each ctrl As Control In TabControl1.SelectedTab.Controls
Select Case ctrl.Name
Case "embChartSSE_Components"
ctrl.BringToFront()
Case "embChartSSE_Fit_Curve"
ctrl.SendToBack()
Case "dgvFit_Components"
ctrl.BringToFront()
End Select
Next
End If
End If
End Sub
This code will fire for any of the tab pages and swap the charts and DGVs over on any of the tab pages. The sender.visible check is to stop the code firing when the form is being created.