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Part 3: Creating Forms and Reports in a Desktop Application
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Figure 10-7. The fdlgContactSearch dialog box is a modal form.
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Inside Out
Using name prefixes to organize your objects Have you noticed the different prefixes on the form names that I designed in the LawTrack Contacts application I like to create a prefix that helps me know more about the type of form when I look at the form list in the Database window. For example, I prefix the names of forms that are designed to open in PivotChart view with cht. I prefix dialog forms with fdlg, normal edit forms with frm, forms designed to edit lookup tables with frmLkp, and subforms with fsub. You might want to adopt a similar naming convention to help you keep your list of forms organized.
Special Controls
The information in a form is contained in controls. The most common control you ll use on a form is a simple text box. A text box can display data from an underlying table or query, or it can display the result of an expression calculated in the control. You ve probably noticed that many controls allow you to choose from among several values or to see additional content. You can also use controls to trigger a macro or a Visual Basic procedure. These controls are discussed in the next five sections.
Option Buttons, Check Boxes, Toggle Buttons, and Option Groups
Whenever the data you re displaying can have only two or three valid values, you can use option buttons, check boxes, or toggle buttons to see or set the value you want in the field. For example, when there are two values, as in the case of a simple Yes/No field, you can use a 372
Part 3: Creating Forms and Reports in a Desktop Application
Using Forms check box to graphically display the value in the field. A check box that s selected means the value is Yes, and a check box that s clear means the value is No. The Inactive control on the frmContactsPages form (see Figure 10-2) and the Default control in the subform of frmCompanies (see Figure 10-5) are good examples of the use of a check box. Stand-alone option buttons and toggle buttons work in the same way as a check box. When the value of an option button is Yes or True, the option button has a black dot in it. When the value of an option button is No or False, the option button appears empty. Likewise a toggle button appears pressed in when True, and not pressed in when False. To provide a graphical choice among more than two values, you can place option buttons, check boxes, or toggle buttons in an option group. When grouped this way, each control in the group should have a unique integer value. When the control appears selected, the value of the option group is the value of the control. Because an option group can have only one value, when you select a control within the group, all other controls in the group appear unselected because their values no longer match the value of the option group. For example, open frmProducts (this form displays the different products available), and click the Print button to see the fdlgProductPrintOptions form (shown in Figure 10-8) that lists the various contact reporting options. (You cannot open fdlgProductPrintOptions directly from the Database window it has Visual Basic code that runs when the form opens to verify that the companion frmProducts form is already open. If not, the code tells Access to not allow the form to open.) If you open this form and click the available option buttons, you can see that when you click one button, the previously selected one clears. When you click one of the sales report buttons on this form, the form reveals additional date range options for your sales report.
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