SWMM5 Delphi GUI Dcombine.pas Summary

 The Dcombine unit is a form used to combine two interface files into a third file in the EPA SWMM project. The user can select the files to combine and then specify a name for the resulting file. The form provides an interface for browsing and selecting files, along with an option to save the combined file.

Key Features:

1. File Selection and Browsing:

   • The form provides a TStringGrid where users can view and select the files to be combined, with an option to browse for files using a TOpenTxtFileDialog for the first two interface files and a TSaveDialog for the output file.
   • The user selects the files using the "Browse" button, and the selected file paths are displayed in the grid.

2. Combining Files:

   • When the "Combine" button is clicked (BtnCombineClick), the utility UCombine.CombineFiles is called with the selected file paths and a description. It performs the file combination, and upon success, the form closes with mrOK.

3. File Dialogs:

   • The OpenFileDlg and SaveFileDlg components are used to select the files to be combined and specify the name of the output file. The file dialogs allow the user to browse the file system to choose the appropriate files.
   • The SpeedButton1Click method handles opening the file dialogs when the user clicks on the "Browse" button next to the file name in the grid.

4. User Interface:

   • The form includes a simple grid where the user can see the names of the files being combined and the description. There are also buttons for combining the files, canceling the operation, and viewing help.
   • The form uses a Label2 to indicate that the files are being combined in the background.

5. Progress Indication:

   • A "stand by" message (Label2.Visible := True) is shown while the files are being processed. The screen cursor changes to crHourGlass to indicate that the program is working.

Constants:

• TXT_ROW_LABELS: Labels for the rows in the TStringGrid.
• TXT_FILE_DLG_FILTER: Filter for the file dialog, specifying that it accepts .TXT files.
• TXT_SELECT_FILE: Title for the file selection dialog.
• TXT_SAVE_FILE: Title for the save file dialog.
• TXT_STAND_BY: Message shown while files are being combined.

Main Methods:

1. FormCreate:

   • This method initializes the file dialog settings and populates the TStringGrid with labels.

2. StringGrid1KeyDown:

   • Handles the key event when the user presses Shift + Enter to invoke the file browsing dialog for a grid cell.

3. SpeedButton1Click:

   • Handles the browsing action by opening a file selection dialog based on which grid cell the user selects.

4. BtnCombineClick:

   • This method calls the CombineFiles function from the UCombine unit, combining the two files into a new one and providing feedback via the UI.

5. BtnHelpClick:

   • Displays the help message for the form.

Summary:

The Dcombine unit provides a user interface to combine two interface files into a third file. It handles file selection, validation, and calls the file combination utility in the UCombine unit. The form also provides feedback during the file combining process, ensuring that users are informed of the status of their action.