C application interface development foundation - form control (2) - MDI form

MDI forms

Single document interface （SDI）

Multi document interface （MDI）

MDI The concept of form

MDI forms （Multiple-Document Interface, Multi document interface ） Used to display multiple documents at the same time .

Used in projects MDI On the window , Usually a MDI Window form as parent form , A parent form can contain multiple child forms in its workspace .

Set up MDI forms

1、MDI Container form

Set a form as a window form , There are two ways ：

1、 On the window “ attribute ” The palette , take IsMidContainer Property is set to True that will do .

False：

 True：

2、 On the window Load Add the following statement to the event

The code is as follows ：

using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.IsMdiContainer = true;
        }
    }
}

2、 Set up MDI Subform

MDI A subform is a normal form . You only need to convert the MdiParent Property to a MDI Parent form , It is the child form of the parent form , The syntax is as follows ：

Form instance name .MdiParent= Parent form object ;

   Set up MDI Containers ：

After modification ：

from Form5 In the attribute , adopt Name Property to change to “MainForm”

After modification ：

Text Property represents the form title , It is amended as follows “MDI forms ”

After modification ： 

 

  New subform （Form1.cs、Form2.cs、Form3.cs、Form4.cs）： 

Code content ：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Form5
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            Form1 form1 = new Form1();
            form1.Show();
            form1.MdiParent = this;
            Form2 form2 = new Form2();
            form2.Show();
            form2.MdiParent = this;
            Form3 form3 = new Form3();
            form3.Show();
            form3.MdiParent = this;
            Form4 form4 = new Form4();
            form4.Show();
            form4.MdiParent = this;
        }
    }
}

After completion ：

The operation results are as follows ：

array MDI forms

The syntax is as follows ：

public void LayoutMdi(MdiLayout value)

value yes MdiLayout One of the enumeration values of , Used to define MDI Layout of subform .

MdiLayout Enumeration members of

Members of the enumeration	explain
Cascade	Cascade arrangement MDI Subform
TileHorizontal	Tile horizontally MDI Subform
TileVertical	Tile vertically MDI Subform

Create a new one Windows Forms application , stay Name Property to name the form unique identifier MainForm, And in Text Properties of the , Name the title of the main form “MDI forms ”.

Select from the menu bar “ View ” command , Re selection “ hold-all ” command , The toolbox will pop up .

Select... In the toolbox MenuStrip Control , A row of menu bars will appear in the form , And then enter “ New form ”、“ Cascade arrangement ”、“ Tile horizontally ”、“ Tile vertically ”、“ close ”.

next , then IsMdiContainer Property is set to True.

Create a subform , And named it “ChildForm”, Next, you can double-click the menu item , Add events . 

The code is as follows ：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Form5
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            Form1 form1 = new Form1();
            form1.Show();
            form1.MdiParent = this;
            Form2 form2 = new Form2();
            form2.Show();
            form2.MdiParent = this;
            Form3 form3 = new Form3();
            form3.Show();
            form3.MdiParent = this;
            Form4 form4 = new Form4();
            form4.Show();
            form4.MdiParent = this;
        }

        private void  New form ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ChildForm mychildForm=new ChildForm();
            mychildForm.Show();
            mychildForm.MdiParent = this;
        }

        private void  Cascade arrangement ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.Cascade);
        }

        private void  Tile horizontally ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.TileHorizontal);
        }

        private void  Tile vertically ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            LayoutMdi(MdiLayout.TileVertical);
        }

        private void  close ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Close();
        }
    }
}

The operation results are as follows ：

Click new form ：

Cascade arrangement ：

Tile horizontally ：

Tile vertically ：