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Compile the application to see the splitter in action. Figure 15.4 shows our window with the splitter dragged far to the right. The MinExtra property setting ensures that the items in the ListView cannot be obscured by dragging the splitter all the way to the right side of the window. The ListView can still disappear when the form is resized, which we will fix in a moment. 490

This program checks each character read from stdin and reports all those that are lowercase letters:

Figure 15.4 The splitter control permits the user to resize the display areas as required for the specific contents.

#include <ctypeh> #include <stdioh> int main(void) { char ch; for(;;) { ch = getchar(); if(ch==' ') break; if(islower(ch)) printf("%c is lowercase\n", ch); } return 0; }

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isupper( )

Before we make some additional changes to our application, let s talk briefly about how the splitter is positioned. Here is an excerpt of the InitializeComponent method generated by Visual Studio .NET for our form.

int isprint(int ch)

private void InitializeComponent() { . . . this.listViewMain.Dock = System.Windows.Forms.DockStyle.Fill; . . . this.treeViewMain.Dock = System.Windows.Forms.DockStyle.Left; this.treeViewMain.Size = new System.Drawing.Size(100, 253); . . . // // splitter1 // this.splitter1.Location = new System.Drawing.Point(100, 0); this.splitter1.MinExtra = 100; this.splitter1.Size = new System.Drawing.Size(3, 253); . . . // // MainForm // this.ClientSize = new System.Drawing.Size(392, 253); this.Controls.AddRange(new System.Windows.Forms.Control[] { this.listViewMain, this.splitter1, this.treeViewMain}); . . . }

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The prototype for isprint( ) is found in <ctypeh> The isprint( ) macro returns non-0 if ch is a printable character, including a space; otherwise, it returns 0 The printable characters are in the range 0x20 through 0x7E

This program checks each character read from stdin and reports all those that are printable:

In the AddRange call made within this code, note how the Splitter control splits the Control array added to the Controls property for the form. This establishes the proper z-order for the form so that the controls appear properly. We can change this to a vertical splitter by changing the Dock property for both the Splitter and the TreeView controls to DockStyle.Top. Visual Studio .NET THE TREEVIEW CLASS 491

#include <ctypeh> #include <stdioh> int main(void) { char ch; for(;;) { ch = getchar(); if(ch==' ') break; if(isprint(ch)) printf("%c is printable\n", ch); } return 0; }

automatically adjusts the Size property for each control to accommodate the horizontal orientation. While this is not part of our final application, these changes are shown in the following code. The corresponding application window appears in figure 15.5.

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isalnum( ), iscntrl( ), isalpha( ), isdigit( ), isgraph( ), ispunct( ), isspace( )

private void InitializeComponent() { // Changes to configure the application with a horizontal splitter // ( not part of our final application ) . . . this.listViewMain.Dock = System.Windows.Forms.DockStyle.Fill; . . . this.treeViewMain.Dock = System.Windows.Forms.DockStyle.Top; this.treeViewMain.Size = new System.Drawing.Size(392, 100); . . . // // splitter1 // this.splitter1.Dock = System.Windows.Forms.DockStyle.Top; this.splitter1.Location = new System.Drawing.Point(100, 0); this.splitter1.MinExtra = 100; this.splitter1.Size = new System.Drawing.Size(392, 3); . . . }

int ispunct(int ch)

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The prototype for ispunct( ) is found in <ctypeh> The ispunct( ) macro returns non-0 if ch is a punctuation character or a space; otherwise, it returns 0

Figure 15.5 This figure displays a horizontal splitter between a tree view and list view control (not our approach).

This program checks each character read from stdin and reports all those that are punctuation:

If you make these changes in your code, make certain you undo them before continuing, as we would like to have a vertical splitter in our final application. Let s get back to our TreeView object and add some nodes to this control. 15.2.3 USING THE TREENODE CLASS Now that the list and tree views on our form are separated by a splitter control, we will get back to the tree view itself. Tree views contain nodes, which may contain other nodes, which may contain still other nodes, and so forth. Each node in the tree is represented by a TreeNode object. This class is summarized in .NET Table 15.3. In the Windows Explorer application, for example, each directory is represented as a tree node, and may contain other directories or files.

12:

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