How can I detect when parentform's properties are changing?

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I am working on a couple of UserControls lately and this time is a custom TitleBar. What I want to do is to detect when ParentForm's properties (like ControlBox for example) is changing by developer in Design Time and then update my TitleBar.

What I have tried:

So I added a Timer into my UserControl to do this "work". It works, but I think this isn't the most appropriate approach...

VB

Private Sub Timer_Tick(sender As Object, e As EventArgs) Handles Timer.Tick
	Me.ControlBox = Me.ParentForm.ControlBox
	If ParentForm.ControlBox = True Then ControlsBox_FlowLayoutPanel.Visible = True Else ControlsBox_FlowLayoutPanel.Visible = False
	If ParentForm.MinimizeBox = True Then MinimizeButton_PictureBox.Visible = True Else MinimizeButton_PictureBox.Visible = False
	Me.MinimizeBox = Me.ParentForm.MinimizeBox
	If ParentForm.MaximizeBox = True Then MaximizeButton_PictureBox.Visible = True Else MaximizeButton_PictureBox.Visible = False
	Me.MaximizeBox = Me.ParentForm.MaximizeBox
End Sub

Is there any other way to do that and not by using a Timer? For example, to detect ParentForm's Text property and then update my UserControl's Text, I do something like this...

VB

Private WithEvents _ParentForm As Form

Protected Overrides Sub OnParentChanged(e As EventArgs)
	MyBase.OnParentChanged(e)
	_ParentForm = Me.ParentForm
	Call ParentForm_TextChanged()
End Sub

Private Sub ParentForm_TextChanged() Handles _ParentForm.TextChanged
	If _ParentForm Is Nothing Then
		FormTitle_Label.Text = FormTitle_Label.Text
	Else
		FormTitle_Label.Text = _ParentForm.Text
	End If
	Invalidate()
End Sub

Is there anything similar for properties like ControlBox, MinimizeBox and MaximizeBox?

Posted 18-Apr-18 2:44am

Simos Sigma

Updated 18-Apr-18 23:51pm

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2 solutions

Solution 1

I'm not quiet sure what you exactly trying to achieve. Never the less ... instead of using a Timer you can take the StyleChanged-Event of the ParentForm.
Each of you requested Properties (ControlBox, MinimizeBox, MaximizeBox etc.) are changing the Style of the Form and raise this Event - so you can call the Content of your Timer_Tick-Method better in this new method ...

For detecting the ParentForm I would not use the OnParentChanged-Method ... I would use the OnHandleCreated-Method ... but the result will be the same ...

Posted 18-Apr-18 10:15am

Ralf Meier

Comments

Simos Sigma 19-Apr-18 5:52am

Thank you very much for your help my friend!!!

Ralf Meier 19-Apr-18 16:05pm

Parakalo - you're welcome ...

Simos Sigma 20-Apr-18 1:36am

Oh, "parakalo" I see!!! :) Do you have any connection with Greece?

Ralf Meier 20-Apr-18 16:27pm

No ... only from holidays ... :(

Simos Sigma 21-Apr-18 2:19am

You are a part of everything that you have into your heart!!! Summer comes and Greece is still here my friend... ;)

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Simos Sigma · Accepted Answer · 2018-04-18T23:52:00

Well, here is an example on how we can detect when ParentForm's properties are changing and then do our stuff...

VB

Private WithEvents _ParentForm As Form

Protected Overrides Sub OnParentChanged(e As EventArgs)
	MyBase.OnParentChanged(e)
	_ParentForm = Me.ParentForm
	Call ParentForm_TextChanged()
	Call ParentForm_StyleChanged()
End Sub

Private Sub ParentForm_TextChanged() Handles _ParentForm.TextChanged
	If _ParentForm IsNot Nothing Then FormTitle_Label.Text = _ParentForm.Text
	Invalidate()
End Sub

Private Sub ParentForm_StyleChanged() Handles _ParentForm.StyleChanged
	If _ParentForm IsNot Nothing Then
		If _ParentForm.ControlBox = True Then ControlsBox_FlowLayoutPanel.Visible = True Else ControlsBox_FlowLayoutPanel.Visible = False
		If _ParentForm.MinimizeBox = True Then MinimizeButton_PictureBox.Visible = True Else MinimizeButton_PictureBox.Visible = False
		If _ParentForm.MaximizeBox = True Then MaximizeButton_PictureBox.Visible = True Else MaximizeButton_PictureBox.Visible = False
	End If
End Sub