VCL.MDIApp Sample
Contents
This sample shows the use of the customized tab preview in the Windows task bar for a Delphi/C++ application.
Location
You can find the MDIApp sample project at:
- Start | Programs | Embarcadero RAD Studio Athens | Samples and then navigate to either:
- Object Pascal\VCL\Taskbar\MDI
- CPP\VCL\Taskbar\MDIApp
- Subversion Repository:
- You can find Delphi and C++ code samples in GitHub Repositories. Search by name into the samples repositories according to your RAD Studio version.
Description
The application creates a main form that has the functionality to open images in a new child form. The application shows a thumbnail preview of each new image in the Windows taskbar. You can close a tab by clicking the close button in the thumbnail preview in Windows taskbar.
How to Use the Sample
- Navigate to Start | Programs | Embarcadero RAD Studio Athens | Samples and open:
- Delphi: MDIApp.dproj
- C++: CPPMDIApp.cbproj
- Press F9 or choose Run > Run.
Files
This project has two source files:
| File | Contains |
|---|---|
|
MainMDIForm |
The main MDI form where text files are open and the child forms are created. |
|
MDIChild |
The child form with text editor. |
Classes
- TMainForm, the main MDI form class, implements the main visual component of the application. It contains a TActionMainMenuBar component and a TActionList to open a text file in a child form.
- TMDIChild, the child form class, contains a TMemo to edit a text.
Implementation
- For the main form, in the Object Inspector set the FormStyle property to
fsMDIForm. For the child form, in the Object Inspector set the FormStyle property tofsMDIChild. - The menu item in the TActionMainMenuBar of the application is linked to the open file action in the TActionList, and a new child form is created for each opened image file.
- The TTaskbar component registers each new form as a new tab.
- For the TTaskbar component, in the Object Inspector set the CustomizedPreview property of the TabProperties to
True. A preview thumbnail of each image is shown in the application Windows taskbar.