Figure 39 Showing the loanAmount Subtopic in .NET

Drawer Denso QR Bar Code in .NET Figure 39 Showing the loanAmount Subtopic
Figure 39 Showing the loanAmount Subtopic
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However, now that we're back to mapping between controls and strings (subtopics, in this case), this is a perfect use for a component that provides extender properties The extender properties would allow you to set the help information for each control using the Property Browser, keeping that information out of the code The component that provides extender properties to manage this information is HelpProvider
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Using the HelpProvider Component
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HelpProvider actually implements both topic navigation support for the F1 key and pop-up help for the help button HelpProvider is a wrapper around the Help class for a specific file, so it works well only for HTML Help After dropping a HelpProvider component onto your form, you should set its HelpNamespace property to the name of the file it should manage, such as dialogschm HelpProvider adds the following properties to each control on a form: string HelpKeyword // Defaults to "" HelpNavigator HelpNavigator; // Defaults to AssociateIndex string HelpString; // Defaults to "" bool ShowHelp; // Defaults to true When F1 is pressed, an empty HelpKeyword results in the HelpString being shown using pop-
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up help Otherwise, F1 causes the HelpKeyword to be passed to ShowHelp and used based on the HelpNavigator property, which can be one of the following: enum HelpNavigator { AssociateIndex, Find, Index, // What ShowHelpIndex does KeywordIndex, TableOfContents, Topic, // The default for ShowHelp } For example, if HelpNavigator is Topic, then HelpKeyword is the name of the topic to show say, loanApplicationDialoghtm ShowHelp is a Boolean that determines whether the HelpProvider should handle the HelpRequested event for the control Setting ShowHelp to false allows you to handle the HelpRequested event manually, as we've been doing so far So after dropping a HelpProvider component onto our sample form, we don't have to handle the HelpRequested event at all Instead, given the HelpNamespace property set to dialogschm, we can set the HelpProvider properties on each control in the form (as shown in Table 31) This action causes F1 and the help button to be handled automatically
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Table 31 Sample HelpProvider Settings
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Control applicantName TextBox applicantPhone NoTextBox applicantLoan Amount HelpKeyword loanApplication Dialoghtm #name loanApplication Dialoghtm #phoneNo loanApplication Dialoghtm #loanAmount HelpNavigator Topic Topic Topic HelpString "Please enter a name" "Please enter a phone number" "Please enter a loan amount" ShowHelp True True True
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Showing Help Contents, Index, and Search
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Dialogs don't often have menus let alone Help menus with Contents, Index, and Search menu items but while we're on the topic of integrating help with forms, I thought it would be a good idea to mention how to implement these help menu items You can do this most easily by using the Help class: void LoanApplicationDialog_HelpRequested(object sender, HelpEventArgs e) { void helpContentsMenuItem_Click(object sender, EventArgs e) { HelpShowHelp(this, "dialogschm", HelpNavigatorTableOfContents); } void helpIndexMenuItem_Click(object sender, EventArgs e) { HelpShowHelpIndex(this, "dialogschm"); } void helpSearchMenuItem_Click(object sender, EventArgs e) { HelpShowHelp(this, "dialogschm", HelpNavigatorFind, ""); }
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Where Are We
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This chapter dealt with topics that are often dialog-related: getting data in and out, validating data, and letting users know about the required data format (including providing access to online help) But none of these topics is specific to "dialogs" (which is a slippery term to get hold of anyway) However, in this chapter and 2: Forms, we've covered almost everything a programmer needs to know about forms If there are things that you haven't seen that interest you, such as drag and drop and form localization, you'll want to read on, especially 8: Controls (for drag and drop) and 10: Resources (for form localization) [ Team LiB ]
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4 Drawing Basics
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As handy as forms are, especially when laden with controls, sometimes the built-in controls[1] aren't sufficient to render the state of your application In that case, you need to draw the state yourself The drawing may be to the screen, to a file, or to a printer, but wherever you're drawing to, you'll be dealing with the same primitives colors, brushes, pens, and fonts and the same kinds of things to draw: shapes, images, and strings This chapter starts by examining the basics of drawing to the screen and the building blocks of drawing
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The standard controls that come with WinForms are listed in Appendix D: Standard WinForms Components and Controls
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Note that all the drawing techniques discussed in this chapter and in the next two chapters relate equally as well to controls as they do to forms For information about building custom controls, see 8: Controls One more thing worth noting before we begin is that the SystemDrawing namespace is implemented on top of GDI+ (Graphics Device Interface+), the successor to GDI The original GDI has been a mainstay in Windows since there was a Windows, providing an abstraction over screens and printers to make writing GUI-style applications easy[2] GDI+ is a Win32 DLL (gdiplusdll) that ships with Windows XP and is available for older versions of Windows GDI+ is also an unmanaged C++ class library that wraps gdiplusdll Because the SystemDrawing classes share many of the same names with the GDI+ C++ classes, you may very well stumble onto the unmanaged classes when looking for the NET classes in the online documentation The concepts are the same, but the coding details are very different between unmanaged C++ and managed anything else, so keep an eye out
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GDI programming certainly isn't easy when compared with SystemDrawing programming, but it's orders of magnitude easier than supporting printers and video display adapters by hand, which was what DOS programmers had to do to put bread on the table
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