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Adding a Navigate Dialog Box
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You saw earlier that deleting the button and the address controls removed the ability to navigate to a Web page. This, of course, is not useful for a Web browser. Now you ll add a dialog box that will give your user another way to navigate to Web pages.
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TO ADD A NAVIGATE DIALOG BOX
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A dialog box is often a Modal Form. It has a predefined behavior in which the user can t click anything other than controls on that form: the OK and Cancel buttons or the red X button to close the form. This means that until the dialog box is closed, the user won t be able to click anything else in the application. To understand what s happening here, just think about the Print dialog box in Microsoft Word: once it is displayed, you can t go back to your document to make any changes while the dialog box is open. The Print dialog box is a modal form.
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1 the templates, select a Windows Form template and name it Navigate.cs. 2 form that you would want to create. 3 rows and columns.
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As you ve done for the About box and the splash screen, add another new item to your project. Using
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You'll now add the components for the Navigate form. These are pretty generic to any dialog box
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First add a table layout panel control with one row and two columns. Use the smart tag to adjust the
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4 btnCancel, respectively.
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Add one button in each column of that table layout panel control. Name your buttons btnOk and
5 Using the following table, set the various properties on the form, table layout panel, and buttons.
Microsoft Visual C# 2005 Express Edition: Build a Program Now!
Control Name Navigate Navigate Navigate Navigate Navigate Navigate Navigate Navigate Navigate tableLayoutPanel1 btnOk btnOk btnCancel btnCancel
Control Type Form Form Form Form Form Form Form Form Form TableLayoutPanel button button button button
Property AcceptButton CancelButton FormBorderStyle MaximizeBox MinimizeBox ShowIcon ShownInTaskbar Size:Width Size:Height StartPosition Anchor Text DialogResult Text DialogResult
Value btnOk btnCancel FixedDialog False False False False 450 150 CenterParent Bottom,Right Ok Ok Cancel Cancel
That s it; those are the properties that you will find in any dialog box.
6 Add a label and a text box:
Name the label lblInfoUrl, set the Text property to "Type an Internet address and My Own Browser will open it for you." Name the text box txtUrl, set the AutoCompleteMode property to SuggestAppend, and set the AutoCompleteSource property to AllUrl. Next set the Modifiers property to Public.
Figure 6-8 Creating a new instance of the form Navigate
7 Figure 6-8.
Size and position the controls so that the Navigate form looks like the one in
6: Modify Your Web Browser Now!
You ve set some of the autocomplete properties of the text box to behave the same way they do in Microsoft Internet Explorer. This means that the text box will suggest and append URLs based on the letters the user types in. You ll now wire this form to the application using a new menu called Navigate.
TO WIRE THE FORM TO THE APPLICATION USING THE NAVIGATE MENU 1 a menu strip with the Help menu; now add a new menu to your menu strip by clicking beside the
Return to the Browser form in Design view and look at the top of the Browser form. You already have
Help menu and typing &Navigate. The & in front of the N will create an underscored N so that the user can press the keystroke combination Alt+N to fire the click event on the Navigate menu. Once it s created, you ll see that the Navigate menu shows up to the right of the Help menu. To
2 move a menu choice, simply select it and drag it where you want. In this case, select it and drop it to
the left of the Help menu. Before adding the code for the event itself, you need to add an important line of code. Remember
3 that in C# everything is an object, and if you want to manipulate another form and exchange data
between the two forms, you first need to create an object of that type that is visible to your main form (Browser form) in this case, an object of type Navigate. Create an instance of the Navigate form outside the source code of any event handler by writing the following line of code in Browser.cs:
Navigate navigateWindow = new Navigate();
Look at Figure 6-9 to see where to insert it.
Figure 6-9 Creating a new instance of the form Navigate
Microsoft Visual C# 2005 Express Edition: Build a Program Now!
Now that you have an instance of the Navigate form class, you can write code to exchange data back and forth with the browser form. And that s exactly what will happen. When the Navigate form displays and the user clicks the OK button with a URL in the text box, the browser control will navigate to the specified URL. Also note that the URL textbox will clear after navigating to the URL to make sure it's empty the next time the user accesses it. On the browser form, double-click the Navigate menu to add the navigateToolStripMenuItem_Click NOTE
If you don t get IntelliSense when typing navigateWindow.txtUrl.Text, be sure you set the Modifiers property on txtUrl to Public as described earlier.
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