MDI childs forms with no free space

Question

I want do something like that with MDI but I don't have any idea how. Now I have only childs on cascade mode.

---

Im back from christmas, from my hometown and start work every day. :)

I necessarily need SuspendLayout and ISupportIntialize?

I dont uderstend how to use SuspendLayout and ISupportIntialize or FixedPanel. So i do this :)

https://i.stack.imgur.com/Wltvd.png

For auto check between 1/2/3/4 panel display mode i try use [select case].

       public partial class MainForm : Form
{            
        Child1Form1 Test1 = new Child1Form1();
        Child1Form2 Test2 = new Child1Form2();
        Child1Form3 Test3 = new Child1Form3();
        Child1Form4 Test4 = new Child1Form4();

    public MainForm()
    {
        InitializeComponent();

        this.AutoSizeMode = AutoSizeMode.GrowAndShrink;
        this.SizeGripStyle = SizeGripStyle.Show;
        //
        // splitContainer1
        //
        //this.splitContainer1.Dock = DockStyle.Fill;
        this.splitContainer1.FixedPanel = FixedPanel.Panel1;
        this.splitContainer1.FixedPanel = FixedPanel.Panel2;
        this.splitContainer1.Panel1.Controls.Add(splitContainer2);
        this.splitContainer1.Panel2.Controls.Add(splitContainer3);
        //
        // splitContainer2
        //
        //this.splitContainer2.Dock = DockStyle.Fill;
        this.splitContainer2.FixedPanel = FixedPanel.Panel1;
        this.splitContainer2.FixedPanel = FixedPanel.Panel2;
        this.splitContainer2.Panel1.Controls.Add(Test1);
        this.splitContainer2.Panel2.Controls.Add(Test2);
        //
        // splitContainer3
        //
        //splitContainer3.Dock = DockStyle.Fill;
        this.splitContainer3.Panel1.Controls.Add(Test3);
        this.splitContainer3.Panel2.Controls.Add(Test4);
        this.Test1.Dock = DockStyle.Fill;
        this.Test2.Dock = DockStyle.Fill;
        this.Test3.Dock = DockStyle.Fill;
        this.Test4.Dock = DockStyle.Fill;
      }


    private void Form1_Load(object sender, EventArgs e)
    {
        this.Test1.Show();
        this.Test2.Show();
        this.Test3.Show();
        this.Test4.Show();
    }
    private void splitContainer1_Resize(object sender, EventArgs e)
    {
        this.Test1.Dock = DockStyle.Fill;
        this.Test2.Dock = DockStyle.Fill;
        this.Test3.Dock = DockStyle.Fill;
        this.Test4.Dock = DockStyle.Fill;
    }

Answer 1

One way to do it: In the case of ChildForm1-4, add one SplitContainer to the form, then add two SplitContainers in each of the panels of the first split container and set Orientation to Horizontal. Your InitializeComponent method should look something like this when the Designer is done:

    private void InitializeComponent()
    {
        this.splitContainer1 = new System.Windows.Forms.SplitContainer();
        this.splitContainer2 = new System.Windows.Forms.SplitContainer();
        this.splitContainer3 = new System.Windows.Forms.SplitContainer();
        ((System.ComponentModel.ISupportInitialize)(this.splitContainer1)).BeginInit();
        this.splitContainer1.Panel1.SuspendLayout();
        this.splitContainer1.Panel2.SuspendLayout();
        this.splitContainer1.SuspendLayout();
        ((System.ComponentModel.ISupportInitialize)(this.splitContainer2)).BeginInit();
        this.splitContainer2.SuspendLayout();
        ((System.ComponentModel.ISupportInitialize)(this.splitContainer3)).BeginInit();
        this.splitContainer3.SuspendLayout();
        this.SuspendLayout();
        // 
        // splitContainer1
        // 
        this.splitContainer1.Dock = System.Windows.Forms.DockStyle.Fill;
        this.splitContainer1.Location = new System.Drawing.Point(0, 0);
        this.splitContainer1.Name = "splitContainer1";
        // 
        // splitContainer1.Panel1
        // 
        this.splitContainer1.Panel1.Controls.Add(this.splitContainer2);
        // 
        // splitContainer1.Panel2
        // 
        this.splitContainer1.Panel2.Controls.Add(this.splitContainer3);
        this.splitContainer1.Size = new System.Drawing.Size(678, 410);
        this.splitContainer1.SplitterDistance = 226;
        this.splitContainer1.TabIndex = 0;
        // 
        // splitContainer2
        // 
        this.splitContainer2.Dock = System.Windows.Forms.DockStyle.Fill;
        this.splitContainer2.Location = new System.Drawing.Point(0, 0);
        this.splitContainer2.Name = "splitContainer2";
        this.splitContainer2.Orientation = System.Windows.Forms.Orientation.Horizontal;
        this.splitContainer2.Size = new System.Drawing.Size(226, 410);
        this.splitContainer2.SplitterDistance = 75;
        this.splitContainer2.TabIndex = 0;
        // 
        // splitContainer3
        // 
        this.splitContainer3.Dock = System.Windows.Forms.DockStyle.Fill;
        this.splitContainer3.Location = new System.Drawing.Point(0, 0);
        this.splitContainer3.Name = "splitContainer3";
        this.splitContainer3.Orientation = System.Windows.Forms.Orientation.Horizontal;
        this.splitContainer3.Size = new System.Drawing.Size(448, 410);
        this.splitContainer3.SplitterDistance = 149;
        this.splitContainer3.TabIndex = 0;
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(678, 410);
        this.Controls.Add(this.splitContainer1);
        this.Name = "Form1";
        this.Text = "Form1";
        this.splitContainer1.Panel1.ResumeLayout(false);
        this.splitContainer1.Panel2.ResumeLayout(false);
        ((System.ComponentModel.ISupportInitialize)(this.splitContainer1)).EndInit();
        this.splitContainer1.ResumeLayout(false);
        ((System.ComponentModel.ISupportInitialize)(this.splitContainer2)).EndInit();
        this.splitContainer2.ResumeLayout(false);
        ((System.ComponentModel.ISupportInitialize)(this.splitContainer3)).EndInit();
        this.splitContainer3.ResumeLayout(false);
        this.ResumeLayout(false);

    }

In the case of ChildForm1-3, add one SplitContainer to the form and set Orientation to Horizontal then add another SplitContainer to the top panel and leave the Orientation as Vertical. Your InitializeComponent method should look something like this when the Designer is done:

    private void InitializeComponent()
    {
        this.splitContainer1 = new System.Windows.Forms.SplitContainer();
        this.splitContainer2 = new System.Windows.Forms.SplitContainer();
        ((System.ComponentModel.ISupportInitialize)(this.splitContainer1)).BeginInit();
        this.splitContainer1.Panel1.SuspendLayout();
        this.splitContainer1.SuspendLayout();
        ((System.ComponentModel.ISupportInitialize)(this.splitContainer2)).BeginInit();
        this.splitContainer2.SuspendLayout();
        this.SuspendLayout();
        // 
        // splitContainer1
        // 
        this.splitContainer1.Dock = System.Windows.Forms.DockStyle.Fill;
        this.splitContainer1.Location = new System.Drawing.Point(0, 0);
        this.splitContainer1.Name = "splitContainer1";
        this.splitContainer1.Orientation = System.Windows.Forms.Orientation.Horizontal;
        // 
        // splitContainer1.Panel1
        // 
        this.splitContainer1.Panel1.Controls.Add(this.splitContainer2);
        this.splitContainer1.Size = new System.Drawing.Size(678, 410);
        this.splitContainer1.SplitterDistance = 226;
        this.splitContainer1.TabIndex = 0;
        // 
        // splitContainer2
        // 
        this.splitContainer2.Dock = System.Windows.Forms.DockStyle.Fill;
        this.splitContainer2.Location = new System.Drawing.Point(0, 0);
        this.splitContainer2.Name = "splitContainer2";
        this.splitContainer2.Size = new System.Drawing.Size(678, 226);
        this.splitContainer2.SplitterDistance = 226;
        this.splitContainer2.TabIndex = 0;
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(678, 410);
        this.Controls.Add(this.splitContainer1);
        this.Name = "Form1";
        this.Text = "Form1";
        this.splitContainer1.Panel1.ResumeLayout(false);
        ((System.ComponentModel.ISupportInitialize)(this.splitContainer1)).EndInit();
        this.splitContainer1.ResumeLayout(false);
        ((System.ComponentModel.ISupportInitialize)(this.splitContainer2)).EndInit();
        this.splitContainer2.ResumeLayout(false);
        this.ResumeLayout(false);

    }