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Compile and run the application to see your code in action. The application should appear as in figure 17.4 at the start of this section.

In addition to putting new values on the end of a vector, you can insert elements into the middle using the insert( ) function You can also remove elements using erase( ) The following program demonstrates insert( ) and erase( )

G-17

The DataGridTextBoxColumn class represents a data grid column style for string data. This class hosts, or manages within a cell of the DataGrid control, a TextBox instance to support editing of string values within the table. This class is part of the System.Windows.Forms namespace, and inherits from the DataGridColumnStyle class. See .NET Table 17 for a list .3 of members inherited from this class. Format FormatInfo Public Properties TextBox Gets or sets a string specifying how text should be formatted within the cell. Gets or sets an IFormatProvider interface that is used to interpret the Format setting. Gets the TextBox object hosted by this column style. This object is an instance of the DataGridTextBox class, which is derived from TextBox.

// Demonstrate insert and erase #include <iostream> #include <vector> using namespace std;

v(10); v2; "<Vector>"; i;

The DataGridBoolColumn class has an alternate set of properties appropriate for boolean columns. Check out the .NET documentation for detailed information on this class.

// initialize v for(i=0; i<10; i++) v[i] = i + 'a'; // copy characters in str into v2 for(i=0; str[i]; i++) v2push_back(str[i]); // display original contents of vector cout << "Original contents of v:\n"; for(i=0; i<vsize(); i++) cout << v[i] << " "; cout << "\n\n"; vector<char>::iterator p = vbegin(); p += 2; // point to 3rd element // insert 10 X's into v vinsert(p, 10, 'X'); // display contents after insertion cout << "Size after inserting X's = " << vsize() << endl; cout << "Contents after insert:\n"; for(i=0; i<vsize(); i++) cout << v[i] << " "; cout << "\n\n"; // remove those elements p = vbegin(); p += 2; // point to 3rd element verase(p, p+10); // remove next 10 elements // display contents after deletion cout << "Size after erase = " << vsize() << endl; cout << "Contents after erase:\n"; for(i=0; i<vsize(); i++) cout << v[i] << " "; cout << "\n\n";

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TRY IT!

27:

Modify the MappingName setting for the table style to use a name other than the "PhotoAlbum" string. Verify that the DataGrid displays the album data in the default format shown in section 17.1. If you are feeling ambitious, create the AlbumCollection class mentioned earlier in the chapter. This class should derive from the CollectionBase class and encapsulate a set of PhotoAlbum objects. You can copy much of the code from the PhotoAlbum class implementation by modifying the use of Photograph to use PhotoAlbum instead. The default constructor should use the PhotoAlbum.DefaultDir value. You can also add a constructor that accepts a directory name. Modify the MyAlbumData application to use this class to display a collection of PhotoAlbum objects. Create a second DataGridTableStyle object to configure how an AlbumCollection object should look as opposed to our style for the PhotoAlbum object. Add this new style to the TableStyles property for the grid, and verify that the correct table style displays based on the type of data source assigned to the control.

// Insert v2 into v vinsert(p, v2begin(), v2end()); cout << "Size after v2's insertion = "; cout << vsize() << endl; cout << "Contents after insert:\n"; for(i=0; i<vsize(); i++) cout << v[i] << " "; cout << endl; return 0; }