Develop Reference

User Control Not Resizing When The Window Is In Maximized State - Windows Forms C#

Lately I am working on this personal app, it's form is without border so the Exit Button, Minimize Button and Maximize button, as well as the option to resize and move the form have been custom added. The app contains several User Controls which perform different functions such as Login, a Control Panel for the app and so on. The issue here is that the User Controls, which are placed within a panel (Anchored properly, of course) in the main form are not resizing properly when the window is in a Maximized state.
To detail... the app starts at
this size and while it's manually resized in minimized state the controls have no issue inheriting it's parent's (the panel) size,
like this and this also works if the window is maximized while the control is visible, like this however if the window is already in a maximized state and I call the control with the designated button the control does not resize, it stays to it's minimum dimensions, like so.
At first I thought it may have something to do with the code that resizes the form so I removed everything and made the app with the default windows border and controls, basically set the border Property from none to sizable but that did nothing. Also I have tried accessing the User Control's parent (the panel) using this.Parent and then setting the width and height of the control with Width = this.Parent.Width and Height = this.Parent.Height but the parent returns null for some reason which I am yet to understand. Now, worth mentioning that those user controls are dynamically added (i.e Login loginForm = new Login();) to the panel every time the button is clicked and then Disposed once the control is left.
I looked all over Google for this but found nothing related and at this point I am out of options. I really want the app to be resizable and must resize properly so if anyone has any solutions I am open to anything.
Thanks anticipated.

Meanwhile, for Winforms, I may have an answer.. the key is to use the Resize event of your user control(s), see below. I tested this in Core 3.1 and Net 4.7, you can use an default designer.cs unit with an empty form. It has no issues with resize from maximized state.
My user control for the center app is named CenteredPanel and derived from Panel. Make sure you derive your user controls from Panel and call base() on the constructor, else the docking will not work properly.
Also, your question about parenting: it was not needed to use Parent below, but if you really need it, make sure you assign it !
public partial class Form1 : Form
{
private Panel panel1, panel2, panel3, panel4;
private CenteredPanel panelApp;
public Form1()
{
InitializeComponent();
this.panel1 = new System.Windows.Forms.Panel()
{ Parent = this, Dock = DockStyle.Fill };
this.panel2 = new System.Windows.Forms.Panel()
{ Parent = panel1, Dock = DockStyle.Left, Width = 120, BackColor = Color.FromArgb(60, 60, 60) };
this.panel3 = new System.Windows.Forms.Panel()
{ Parent = panel1, Dock = DockStyle.Fill };
this.panel4 = new System.Windows.Forms.Panel()
{ Parent = panel3, Dock = DockStyle.Top, Height = 60, BackColor = Color.FromArgb(60, 60, 60) };
this.panelApp = new WindowsFormsAppCore.CenteredPanel()
{ Parent = panel3, Dock = DockStyle.Fill, BackColor = Color.FromArgb(90, 90, 90) };
this.panel1.Controls.Add(this.panel3);
this.panel1.Controls.Add(this.panel2);
this.panel3.Controls.Add(this.panelApp);
this.panel3.Controls.Add(this.panel4);
this.Controls.Add(this.panel1);
}
}
public class CenteredPanel : Panel
{
Label label1, label2;
TextBox textbox1;
public CenteredPanel() : base()
{
this.Resize += new System.EventHandler(this.Resizer);
this.label1 = new System.Windows.Forms.Label()
{ Parent = this, AutoSize = true, Name = "label1", ForeColor =Color.White, Text = "Connectare Administrator" };
this.label2 = new System.Windows.Forms.Label()
{ Parent = this, AutoSize = true, Name = "label2", ForeColor = Color.White, Text = "Nume de utilizator" };
this.textbox1 = new System.Windows.Forms.TextBox()
{ Parent = this, AutoSize = true, Name = "textbox1", PasswordChar = '*', Text = "****" };
this.Controls.Add(this.label1);
this.Controls.Add(this.label2);
this.Controls.Add(this.textbox1);
}
public void Resizer(object sender, EventArgs e)
{
Point CenteringAnchor = new Point(Width / 2, Height / 2);
for (int i=0; i<Controls.Count; i++)
{
Control c = Controls[i];
// put your resizing rules here.. this is a very simple one
c.Location = new Point(CenteringAnchor.X - c.Width / 2, -40 + i * ((i == 1) ? 40 : 30) + CenteringAnchor.Y - c.Height / 2);
}
}
}

Set Location for new form

I use below code to make lightbox effect and it works as i expected. However if i move the parent form it still pop-ups on the center of the screen.
// Execute this code from parent form
Form f = new Form();
f.ShowInTaskbar = false;
f.BackColor = Color.Black;
f.Size = this.Size;
f.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
f.StartPosition = this.StartPosition;
f.Opacity = 0.6;
f.Show();
So i changed the above code like below;
f.StartPosition = FormStartPosition.CenterParent;
However it still doesn't pop-up center of the parent form.
Also i tried below, It didn't work too;
f.SetBounds(this.Location.X, this.Location.Y,this.Width, this.Height);
I already tried the solutions here;
Show a child form in the centre of Parent form in C#
They also didn't work.
What i want to do is, creating a second form with the same size and same location.

Just changing this line;
f.Show();
to this line, It worked;
f.ShowDialog();

How can I change location of label when using maximized window

I have the label1 (show 1 value) that has properties
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(554, 636);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(140, 155);
this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
It is added in the main form as bellow code
this.Controls.Add(this.label1);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.SizableToolWindow;
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
//this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
It worked well. However, if I add one more code as
this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
I want to auto change location of label 1 such as it still located in the yellow region. Is it possible in C#?

In visual studio labels are by default Anchored to Top and Left. this causes the problem when you maximize your form.
try this line of code
this.label1.Anchor = AnchorStyles.None;
Another way to do this (From Designer)
Click on your label and then Press F4, properties window will appear.
See Anchor Property.
You can change it to NONE. it would solve your problem.

How can i Remove Maximize,Minimize and Close icon in MDI Menustrip

iam using C#.Net Windows Application.In my project have different module that will be used by MDI..
now what the problem is,i can open a new form mean they will display maximize,minimize and Close icon in both MDI and Menustrip.See Below Image...
How can i remove child forms icons(Maximize,Minimize and Close) from MenuStrip
Thanks in Advance...

In winforms the area where those buttons are is called ControlBox if you do not want them to be displayed you should set the ControlBox property of the form to false
childForm.ControlBox = false;
But as pointed out in the comments you could use your forms as UserControls by just setting its TopLevel property to false
Form childForm = new Form()
childForm.TopLevel = false;
childForm.Parent = MainForm;
childForm.Show()
Doing that you can acomplish the same final result as an MDI form

I am sure this is solve for what you search
in first you should set all properties
formborderstyle = None
ControlBox = false
MaximizeBox = false
MinimizeBox = false
showicon = false
and DO NOT SET Windowstate = maximized
secondly when you create object from this form
form1 form= new Student();
form.MdiParent = this;
form.Dock = DockStyle.Fill;
form.Show();

How do you resize a form to fit its content automatically?

I am trying to implement the following behaviour:
On a form there is a tabcontrol. On that tabcontrol there is a treeview. To prevent scrollbars appearing, I would like the form to change its size according to the contents of the treeview when displayed for the first time.
If the treeview has too many nodes to be displayed on the default size of the form, the form should change it's size so that there is no vertical scrollbar on the treeview (up to a maximum size allowed by the size of the screen).
What I need to know is, if it is possible to achieve this behaviour through the properties of the controls. I'm sure this can be achieved by calculating and settings the sizes of the elements programmatically, but I would like to know if there is a way to achieve this by settings like AutoSizeMode etc.
[UPDATE]
It's the first dialog a user of my application sees: It's a dialog to select the database to work with. It's a list of databases, with a tabcontrol, buttens etc. If the list is too long, scrollbars appear and a colleague of mine wants them to disappear.

Use the AutoSize and AutoSizeMode properties.
http://msdn.microsoft.com/en-us/library/system.windows.forms.form.autosize.aspx
An example:
private void Form1_Load(object sender, EventArgs e)
{
// no smaller than design time size
this.MinimumSize = new System.Drawing.Size(this.Width, this.Height);
// no larger than screen size
this.MaximumSize = new System.Drawing.Size(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, (int)System.Windows.SystemParameters.PrimaryScreenHeight);
this.AutoSize = true;
this.AutoSizeMode = AutoSizeMode.GrowAndShrink;
// rest of your code here...
}

By using the various sizing properties (Dock, Anchor) or container controls (Panel, TableLayoutPanel, FlowLayoutPanel, etc.) you can only dictate the size from the outer control down to the inner controls. But there is nothing (working) within the .Net framework that allows to dictate the size of a container through the size of the child control. I also missed this a few times and tried the AutoSize property, but it never worked.
So all you can do is trying to get this stuff done manually, sorry.

From MSDN:
To maximize productivity, the Windows Forms Designer shadows the
AutoSize property for the Form class. At design time, the form
behaves as though the AutoSize property is set to false,
regardless of its actual setting. At runtime, no special
accommodation is made, and the AutoSize property is applied as
specified by the property setting.

This might be useful.
It resizes a new form to a user control, and then anchors the user control to the new form:
Form f = new Form();
MyUserControl muc = new MyUserControl();
f.ClientSize = muc.Size;
f.Controls.Add(muc);
muc.Anchor = AnchorStyles.Top | AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right;
f.ShowDialog();

You could calculate the required height of the TreeView, by figuring out the height of a node, multiplying it by the number of nodes, then setting the form's MinimumSize property accordingly.
// assuming the treeview is populated!
nodeHeight = treeview1.Nodes[0].Bounds.Height;
this.MaximumSize = new Size(someMaximumWidth, someMaximumHeight);
int requiredFormHeight = (treeView1.GetNodeCount(true) * nodeHeight);
this.MinimumSize = new Size(this.Width, requiredFormHeight);
NB. This assumes though that the treeview1 is the only control on the form. When setting the requiredFormHeight variable you'll need to allow for other controls and height requirements surrounding the treeview, such as the tabcontrol you mentioned.
(I would however agree with #jgauffin and assess the rationale behind the requirement to resize a form everytime it loads without the user's consent - maybe let the user position and size the form and remember that instead??)

This technique solved my problem:
In parent form:
frmEmployee frm = new frmEmployee();
frm.MdiParent = this;
frm.Dock = DockStyle.Fill;
frm.Show();
In the child form (Load event):
this.WindowState = FormWindowState.Maximized;

If you trying to fit the content according to the forms than the following will help. It helps me while I was trying to fit the content on the form to fit when ever the forms were resized.
this.contents.Size = new Size(this.ClientRectangle.Width,
this.ClientRectangle.Height);

I User this Code in my project, Useful for me.
private void Form1_Resize(object sender, EventArgs e)
{
int w = MainPanel.Width; // you can use form.width when you don't use panels
w = (w - 120)/4; // 120 because set 15px for each side of panels
// and put panels in FlowLayoutPanel
// 4 because i have 4 panel boxes
panel1.Width = w;
panel2.Width = w;
panel3.Width = w;
panel4.Width = w;
}

I used this code and it works just fine
const int margin = 5;
Rectangle rect = new Rectangle(
Screen.PrimaryScreen.WorkingArea.X + margin,
Screen.PrimaryScreen.WorkingArea.Y + margin,
Screen.PrimaryScreen.WorkingArea.Width - 2 * margin,
Screen.PrimaryScreen.WorkingArea.Height - 2 * (margin - 7));
this.Bounds = rect;