Delphi5 developer's guide by Steve Teixeira, Xavier Pacheco

By Steve Teixeira, Xavier Pacheco

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0 projects Samples Sample custom components ActiveX Sample ActiveX controls Midas Components used for creating multi-tiered database applications The online Help provides information about the components on the default palette. The components on the ActiveX and Samples pages, however, are provided as examples only and are not documented. 2-10 Developer’s Guide Using components Properties common to visual components All visual components (descendants of TControl) share certain properties including • • • • • • Position and size properties Display properties Parent properties Navigation properties Drag-and-drop properties Drag-and-dock properties While these properties are inherited from TControl, they are published—and hence appear in the Object Inspector—only for components to which they are applicable.

Set AllowGrayed to True to give the check box three possible states: checked, unchecked, and grayed. • The State property indicates whether the check box is checked (cbChecked), unchecked (cbUnchecked), or grayed (cbGrayed). Radio buttons Radio buttons present a set of mutually exclusive choices. You can use individual radio buttons or the radio group component, which arranges groups of radio buttons automatically. See “Grouping components” on page 2-18 for more information. Toolbars Toolbars provide an easy way to arrange and manage visual controls.

If AllowAllUp is True, all of the speed buttons in a group can be unselected. Set AllowAllUp to False if you want a group of buttons to act like a radio group. Check boxes A check box is a toggle that presents the user with two, or sometimes three, choices. • Set Checked to True to make the box appear checked by default. • Set AllowGrayed to True to give the check box three possible states: checked, unchecked, and grayed. • The State property indicates whether the check box is checked (cbChecked), unchecked (cbUnchecked), or grayed (cbGrayed).

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