Teach Yourself Borland C++ in 14 Days - portal

292 Day 8
Table 8.4. continued
Item Applies To Description
Runtime Properties
Modified All Indicates whether the contents of the edit
control have changed since the last time
the Modified property was set. After
saving the contents of a Memo or RichEdit
component to a file, you should set
Modified to false.
SelLength All Contains the length of the text currently
selected in the edit control.
SelStart All Contains the starting point of the selected
text in the edit control. The first character
in the edit control is 0.
SelText All Contains the currently selected text in an
edit control.
Edit controls have many common methods; they are too numerous to list here. The
CutToClipboard(), CopyToClipboard(), PasteFromClipboard(), and Clear() methods deal
with Clipboard operations and text manipulation. The GetSelTextBuff() and GetTextBuff()
methods retrieve the selected text in the component and the entire text in the component,
respectively. See the C++Builder online help topics TEdit, TMaskEdit, TMemo, and TRichEdit
for a complete list of methods pertaining to each type of edit component.
The edit component events that you are most likely to be interested in are dependent on the
type of edit control you are using. In general, though, the OnEnter, OnExit, OnChange,
OnKeyDown (or OnKeyPress), and OnKeyUp events will be the most widely used.
The ListBox and ComboBox Components
The ListBox and ComboBox components are also widely used. The ListBox component
represents a standard Windows list box, which simply presents a list of choices that the user
can choose from. If the list box contains more items than can be shown at one time, scrollbars
appear to allow access to the rest of the items in the list box.
NEW TERM
Some list boxes are owner-drawn list boxes. In an owner-drawn list box, the
programmer takes the responsibility for drawing the items in the list box.