I have a container (a panel) which can contain multiple Form controls.
(Form.TopLevel = False)
When the user moves the Forms around I would like to display scrollbars when a form is out of the panel bounds.
When I register the Form.Move event, I can set the AutoScrollPosition. This works unless the user uses the scrollbars.
The problem is that the form.move event is also fired when the scrollbars are used. The result is that the scrollbars don't work. (And I have currently no idea how to find out whether the form has been moved by the mouse or by the scrollbar)
So the question is: How can I make the scrollbars of the panel appear/work when a form (or multiple) forms of the panel exceed the boundaries? I think there must be a simpler way than to handle the move event..
Note:
The panel is placed inside a Infragistics DockableControlPane. (Managed by an UltraDockManager)
(So there are multiple panels which contain at least one form per panel)
The reason is that the "panels" should appear as tabs, can be moved around using the DockManager and display their "sub" forms (Which also can be moved around on their panel).
Any idea would be great
It looks like the LocationChanged event could be used. Example with only one form:
Protected Overrides Sub OnLoad(e As EventArgs)
MyBase.OnLoad(e)
Dim f As New Form
f.TopLevel = False
AddHandler f.LocationChanged, AddressOf Form_LocationChanged
Panel1.Controls.Add(f)
f.Show()
Call Form_LocationChanged(f, EventArgs.Empty)
End Sub
Private Sub Form_LocationChanged(sender As Object, e As EventArgs)
With DirectCast(sender, Form)
Panel1.AutoScrollMinSize = New Size(.Bounds.Right, .Bounds.Bottom)
End With
End Sub
Using an MDI form seems to be more appropriate though for something like this.
Related
In WinForms application I need some "caption" in dynamically created ContextMenuStrip.
That caption is changable text composed in ContextMenuStrip_Opening event handler.
For that purpose I'm trying to use ToolStripControlHost with label in it, like this:
Dim labelItem As ToolStripControlHost = New ToolStripControlHost(New Label)
...
labelItem.BackColor = Color.Transparent
labelItem.ForeColor = Color.FromKnownColor(KnownColor.HotTrack)
labelItem.ToolTipText = "mytooltiptext"
mycontextmenu.Items.Add(labelItem)
That work almost OK, but...
I try to disable that "labelItem" to avoid clicks and keypresses and then it becomes gray automatically what is unwanted and also then tooltiptext is not showed.
If "labelItem" is enabled then color is OK, item cannot be selected with keys but can be with mouse and on mouse click it takes focus to itself. That is also unwanted but shows tooltiptext.
Is here a way in described situation to get "labelItem" to be enabled and able to show tooltiptext but be unselectable? In short... How to make an item like is described which would be in color (enabled) but would not accept mouse clicks and take a focus?
Don't disable the item. Set the disabled state image and then in the click event handler, just ignore the case for the item you don't want to be active.
Enabled and Disabled are predetermined definitions for for the appearance and behavior of a control. Disabled will always mean the control can't be clicked.
If you need alternate behavior, you'll need to write it yourself. I would suggest tracking two global variables in your form: whether or not your item should be active in a boolean and which object currently has focus in an object. Then use these to write your click event behavior. For example:
Public Class Form1
Public RunEvent As Boolean
Public HasFocus As Object
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If RunEvent Then
'Do something
Else
HasFocus.Focus()
End If
End Sub
End Class
I have an issue that I cannot seem to overcome.
In my application, I have a custom class that loads a form into a panel upon startup. Then when I click a button on my main form I show the panel as visible revealing the form to the user.
My problem is that I want to be able to hide the panel when a user clicks outside of it (back onto the main form).
so far I have tried Form_Deactivate, Form_Leave, Form_LostFocus, Panel_Leave and Panel_LostFocus events but nothing will seem to trigger an event consistently to hide the panel. The only thing that works is if the user clicks inside the form (on a listview control) once the form is visible and then clicks outside of the form.
Is there anyway I can ensure this event gets called everytime whether the user clicks the form or not?
So far my code looks something like:
Public Class cls_UserObjects
Private frm As frmUsers
Public pnl As Panel
Public Sub ShowUserPanel()
Try
frm = New frmUsers
frm.TopLevel = False
pnl.Controls.Add(frm)
frm.Show()
frm.Focus()
....
End Class
Then in my main form I call the code below to build the form into the panel:
class_Users.pnl = pnlUsers
class_Users.ShowUserPanel()
And pnlUsers.Visible = True to show it to the user
I just can't seem to close it. I understand that Panels don't support the LostFocus properly, however, I can't find away around this. Maybe it has something to do with how I am opening my form/panel but I was advised to use classes to open forms so I can have more control over the controls within my forms from outside calls.
Any help appreciated. Thanks
MouseLeave event works, the panel hides immediately once it leaves the panel.
Private Sub Panel1_MouseLeave(ByVal sender As Object, ByVal e As System.EventArgs) Handles Panel1.MouseLeave
Panel1.Visible = False
End Sub
Is there a simple way to Activate the form when any controls in the form is clicked like datagirdview, panel, menustrip, button, textbox, label, etc....
it happens that my project can show many different form and it's hard for me to activate one form when it's on the back of the active form. I need to clicked the border of the form to activate it.
most likely your problem arises because your form is MDI child.. you'll have to click the menu bar to activate the form.. but if you have a borderless form, clicking on controls wont activate the form.. again, this usually happens on MDI but it shouldnt happen on a regular winform.. unless you have other running events in the background that interferes with the process.
You question is not clear at all, and I don't know what you are trying to archieve, but for executing something with a click event you have to add the handler for every control.
If you are declaring it not dinamically just:
Private Sub ControlsClick(sender As Object, e As EventArgs) _
Handles Panel1.Click, Button1.Click, TextBox2.Click ' etc.
Me.Activate 'Or Whatever
End Sub
You have to add the handler for each control. The same if you do it dinamically:
Private Sub InitializeClickHandlers(sender As Control, Optional bChilds As Boolean = True)
For Each elem As Control In sender.Controls
AddHandler elem.Click, AddressOf ControlsClick(elem, New EventArgs)
If bChilds AndAlso elem.Controls.Count > 0 Then
Call InitializeClickHandlers(sender)
End If
Next
End Sub
Then, for every control in the form, you call it like: Call InitializeClickHandlers(Me)
Or, for every control inside a panel: Call InitializeClickHandlers(Panel1)
I have a 1080p touchscreen application. When a modal pops up, i want to emphasize that by darkening the main form.
Right now i use a second form, the size of the main form, that is black and has 50% opacity. Whenever a modal needs to appear, i open the opaque form, and then open the desired modal.
I feel this is a bit devious for my purpose. Its also not asshole-proof that when the user alt tabs, the forms will glitch out of sequence.
Is there a better way to achieve the darkening effect. Perhaps by darkening the main form from within itself?
Solved it myself by doing the following:
Place a hidden picturebox with dock:fill on the main form,
Take a screenshot of the current screen and darken it
assign the image to the picturebox and make it visible
open the modal in a new win
when the modal is dismissed
hide the picturebox
It really stupid that VB.net doesn't have this function built into it. Here's what you do to get around it:
Make a new form and call it Shade. I'm going to assume your main form is called frmMain. For the sake of clarity, lets assume the form you're launching is called dlgX.
Add the following lines in the Load event of dlgX (that's the sub with dlgX.Load or Me.Load or MyBase.Load):
Shade.Opacity = 0.001
Shade.Show()
Shade.Location = frmMain.Location ' Form location will only update if the form is visible.
Shade.Hide()
Shade.FormBorderStyle = Windows.Forms.FormBorderStyle.None 'This gets rid of the windows Titlebar and window border.
Shade.Size = frmMain.Size
Shade.BackColor = Color.Black
Shade.Opacity = 0.5
Shade.Show() ' Form size will only update the next time you show it.
Shade.TopMost = True ' Puts Shade over main form
Me.TopMost = True ' Puts current form over shade
Under all events that dismiss the form dlgX (OK.click, Cancel.click, etc), add the following lines:
Shade.Close
Or you can even make your own sub that handles all events where the form is closed:
Private Sub DispelShades(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Me.FormClosed
Shade.Close()
End Sub
This is way simpler than the PictureBox scenario and you don't have to mess with layering issues and having to ensure that the PictureBox renders on top of everything (for example, tabs really do not like having things rendered above them and they will not let you render a picture box above them). Rendering a black semi transparent form above your main form gets around all these headaches.
If you have multiple forms to shade, just make a Shad1, Shade2, Shade3 etc.
This is pretty obvious but it's worth stating: if you're shading the main form, you'll also want to make it unclickable by opening dlgX via dlgX.ShowDialog and not dlgX.Show
Here is some code, very similar to the method in Thomas's answer. Note to use the Darkness property in a Try...Finally block, to make sure you never leave the form in the dark state.
Public Class Form1
Private _PB As PictureBox
Public WriteOnly Property Darkness
Set(value)
If value Then
Dim Bmp = New Bitmap(Bounds.Size.Width, Bounds.Size.Height)
Me.DrawToBitmap(Bmp, New Rectangle(Point.Empty, Bounds.Size))
Using g = Graphics.FromImage(Bmp)
Dim Brush As New SolidBrush(Color.FromArgb(125, Color.Black))
g.FillRectangle(Brush, New Rectangle(Point.Empty, Bmp.Size))
End Using
_PB = New PictureBox
Me.Controls.Add(_PB)
_PB.Size = Bounds.Size
_PB.Location = Bounds.Location - PointToScreen(Point.Empty)
_PB.Image = Bmp
_PB.BringToFront()
Else
If _PB IsNot Nothing Then
Me.Controls.Remove(_PB)
_PB.Dispose()
End If
End If
End Set
End Property
Private Sub btnDialog_Click(sender As Object, e As EventArgs) Handles btnDialog.Click
Try
Darkness = True
MsgBox("Modal dialog")
Finally
Darkness = False
End Try
End Sub
End Class
I made a simple application in which an MDI parent loads a child form at a click of a menu item..(I am going to implement this in a much bigger and more useful application)...It contains initially a MenuStrip and on a click of the MenuStrip item a new form will open (typical MDI parent form style) This form is border less and I would like it to fit and fill the remaining space under the the MDI parents MenuStrip.
I need to know the properties to use in order to achieve this and at the same time (for the child form) to fit into the MDI parent form's free space at any resolution at which the display is.
So far I tried this but I got this error: Property access must assign to the property or use its value.
Private Sub frmGenPay_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.StartPosition(10, 10)
Call FitToScreenCompanyDetails()
End Sub
In the module:
Public Sub FitToScreen()
frmMDImainform.Size = My.Computer.Screen.Bounds.Size
End Sub
The second code above is for the MDI parent form if someone could give me some suggestions on this too it would be really kick-start things.
Thanks to everyone for any piece of advice. Thanks in Advance!
Me.StartPosition(10, 10)
That just isn't valid code. StartPosition is a property, you are treating it as though it is a method. Nor does it take a location. My best guess for the intended code:
Me.StartPosition = FormStartPosition.Manual
Me.Location = New Point(10, 10)
You'll run into more trouble implementing your intended design. There should be only one MDI main window. MDI child windows cannot be borderless.
Instead of worrying about startpositions, sizes and bounds, why can't you just (in the child form) set:
Me.WindowState = FormWindowState.Maximized
Me.MdiParent = myMDIParent