CODEWITHSUNDEEP
.netvb.netwinformsmaximize
Toby
Toby

Reputation: 10154

Make WinForm form maximize to desktop height with multiple screens

I have a VB.NET WinForm program in MS VS2017 on MS Windows 10, that has a restricted width, but that should maximize in height the same as any normal Windows application. I have multiple monitors, of different sizes, which seems to be messing with how the application determines the desktop's height. I should note, that my task-bar is set to not expand across the second screen, but only appear on the primary screen (this does not seem to affect other Windows applications behavior though).

I am using the following code in the Move event handler (I tried overriding WndProc too, but no luck) but the form maximizes behind the task-bar on the primary screen, i.e. it takes up the full screen height, where it should take up the full screen height minus the task-bar height. It does however, maximize to the correct height on the secondary screen.

Private Sub form1_Move(sender As Object, e As EventArgs) _
    Handles MyBase.Move
    Me.MaximumSize = New Size(Me.MaximumSize.Width, _ 'fixed width
            My.Computer.Screen.Bounds.Height) 'screen height
End Sub

Today I tried changing the line to:

    Me.MaximumSize = New Size(Me.MaximumSize.Width, _ 'fixed width
            My.Computer.Screen.FromControl(Me).WorkingArea.Height) 'screen height

But this now results in more complex, but still incorrect behavior! (Not full height on the secondary screen). I also tried using SystemInformation.VirtualScreen.Height, but again, no luck

What is correct way of managing to get the correct height?

Here is an image two of the issues described, the left is the primary monitor, with the form maximizing with a height that places part of it behind the task-bar, the right is the secondary monitor with the maximized height not being high enough to fill the screen that doesn't have the task-bar. As described above, some code ended up also having the form not even meeting the task-bar when maximized on the primary monitor. Basically I just want it to maximize just like any other application, correctly on either monitor, with or without a task-bar, but with a restricted width. screen-grab

Upvotes: 2

Views: 1639

Answers (2)

AlexVMM
AlexVMM

Reputation: 134

Using this will give you the max height with the taskbar

SystemParameters.WorkArea.Height

Also this post may help full screen mode, but don't cover the taskbar

Upvotes: 0

Roger Lipscombe
Roger Lipscombe

Reputation: 91965

Look at the documentation for WM_GETMINMAXINFO, and however that's exposed in .NET.

You might also want to look at WM_WINDOWPOSCHANGING message.

Both of these allow you to control the size of your window.

Upvotes: 2

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