In this user guide, we are going to find out some of the possible causes that may be running mdi in a Windows application, and then we give possible solutions that you can try to fix the problem. A multi-document program (MDI) is a graphical user interface that has multiple windows under a new single parent window. Such systems continually allow child windows to integrate almost all other windows into them, creating complex nested hierarchies.
MDI child forms are almost always an integral part of Multiple Document Interface (MDI) applications because these forms can represent the central user experience.
In this procedure below, you use Visual Studio to create an MDI child report that displays an indistinguishable RichTextBox control in most text editors. By modifying the System.Windows.Forms control with other configurations such as the DataGridView control or combinations of controls, you can potentially create MDI child windows (and thanks to the extension, MDI applications) with different ideas.
Creating MDI Subforms
Create a future Windows Forms project application in Visual Studio. In the properties window of the current form, set its IsMdiContainer property to
This refers to the form as an MDI container for child windows.
What is MDI and its uses?
MDI (Multiple Document Interface) is a Microsoft Windows programming interface for building good applications that allows users to achieve good results with multiple documents at the same time. Each document is located in a functionally separate area with its own scroll guide.
Drag MenuStrip from
Toolboxto reduce the size of the form. Place its
textfield in the file.
Click the ellipsis (…) to access the Items property, then simply click Add to add two slug child menu items. Set each of our
Textproperties for the elements on New and Window.
In Solution Explorer, right-click the project and choose Add> New Item.
In the Add Item dialog box, select another Windows Form (in Visual Basic or Visual C #) or Windows Forms Application (.NET) (in Visual C ++) dialog box in the Templates pane. In the Name box, name Form2. Select Open to publish the form to the project.
The MDI child form you created in the exercise is a standard Windows form. Thus, it has an important Opacity property that allows you to control the opacity of the form. However, the Opacity property was supposedly intended for top-level windows. Do not consider this for daughtersthem in MDI forms, as decoration problems may arise.
This form is usually the template for your MDI Tiddler forms.
The Form Window Designer opens and examines Form2.
What is MDI example?
Multiple Document CP (MDI) applications allow you to open multiple journals at the same time. NET is a sample MDI application – you can open many source files and even project views in one. In contrast, Notepad is an important example of an SDI application – opening on a document closes any previously compromised document.
Drag the RichTextBox control from the Toolbox to the form.
In the Properties window, set the
Anchorproperty to Top, Left and
Anchorfor the property and resources to Fill.
This causes the RichTextBox operation to completely fill the area of most MDI child forms, even if the form is resized.
Double-click, I’d say, the New menu item to create a complete click event handler for it.
Insert a replacement like the one below to set up a new MDI subform as a user by clicking the New Menus menu item.
In the following example, the Seminar Manager handles the click event to receive the
MenuItem2. Note, however, that depending on your application structure, your new menu item may not be
Protected Sub MDIChildNew_Click (ByVal Sender System as.Object, ByVal e As System.EventArgs) handles MenuItem2.Click Dim NewMDICild as new shape 2 () The parent set of the child window form. NewMDICild.MdiParent = i 'Display the new shape. NewMDICild.View ()The end of the submarine
protected MDIChildNew_Click (object void emailer, System.EventArgs e) Form2 newMDICHild New = Form2 (); // Determine the parent shape of some child windows. newMDICild. = mdiparent this; // Display a new human shape. newMDICild.Show ();
private: void menuItem2_Click (System :: Object ^ sender, System :: EventArgs ^ e) Form2 ^ newMDICHild stands for gcnew Form2 (); // Determine the parent shape of the child window. newMDICild-> MdiParent matches this; // Display the new form. newMDICHild-> Display ();
In C ++, add the following
#includedirective to the top of Form1.h:
This activates the window menu, which can store a list of open MDI child windows with a check mark next to the active young window.
Press F5 to writeinstall the application. By choosing New in the file navigation, you can create new MDI forms for boys or girls that will be monitored in the Window menu item.
When a distinct MDI child form has each MainMenu component (usually with a menu item menu construct) and does not close in a parent MDI application having a MainMenu in (usually with a menu structure from layout elements) the menu items are automatically merged if you set the MergeType property (and possibly see the MergeOrder property). Set the MergeType property, which is associated with both the mainmenu components and all menu items in the small form, to MergeItems for the type a MergeOrder property so that selections from both menus appear in the order you want, also keep in mind that when a good MDI parent form is closed, any reference to MDI subforms will cause the a> to close before the Closing event is raised to create the MDI parent MDI cannot cancel the Closing a> event of the MDI child to prevent Closing Own Mom or Dad however is not allowed with the new cancelleventargs argument for Closing from MDI papa or – Mother is set to
true. You can force close that particular MDI parent and all MDI Small Fry forms. set the CancelEventArgs argument to
- Multi-Document Interface (MDI) Applications
- How To: Create Top-Level MDI Forms
- Instructions: Define an active MDI child
- Instructions: Send data to a specific active MDI child
- How To: Organize MDI Subforms
- 4 minutes to read aria-label = “adegeoGithub
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In the following example, the event formatter handles the click event to create a
MenuItem2 . Note, however, that depending on the architecture of your application, the new menu item may differ from
If an MDI subform has a MainMenu component (usually with a special menu structure for menu items) and therefore the top MDI form opens with MainMenu <. a / a> (usually the podium of the menu item), the menu item is automatically merged if you set the MergeType property (as well as MergeOrder ). Set some of the MergeType properties of both mainmenu components and all subform menu items to MergeItems MergeOrder Property, so that the menu items on both sides appear in the order you want.Also, be aware that when the parent MDI form is closed, the child MDIs also place the Closing event. Increment before Closing event for parent MDI is now dispatched. Canceling the Closing event of a child MDI does not become the Closing event of the parent MDI. The a> event was triggered; however the cancelleventargs argument for the entire parent Closing MDI event becomes
true at this point, you want to close the parent MDI form and many MDI Child forms, simply by using argument t Set CancelEventArgs to
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