Description
delphivcl.ComboBox combines an edit box with a scrollable list. A ComboBox component is an edit box with a scrollable drop-down list attached to it. Users can select an item from the list or type directly into the edit box.
Note: The width of the button in a TComboBox is equal to the width that Windows uses for scrollbars. This width depends on the color scheme that the user has…
delphivcl.ListBox displays a collection of items in a scrollable list. We use ListBox to display a scrollable list of items that users can select, add, or delete. ListBox is a wrapper for the Windows listbox control.
We can browse all the properties, methods, and…
Rect indicates the portion of the list view’s client area covered by the work area.
Set Rect to specify the sphere of influence of a work area. Rect is the bounding rectangle of a portion of the list view’s client area. If Rect specifies a region larger…
DelphiVCL.ScrollBar or TScrollBar is a Windows scroll bar, which is used to scroll the contents of a window, form, or control.
We can use TScrollBar to add a free-standing scroll bar to a form. Many controls have properties that add scroll bars which are an integral part of the control (TControlScrollBar objects). TScrollBar allows controls that do not have integrated scroll bars or…
delphivcl.CheckBox represents a check box that can be on (checked) or off (unchecked).
A CheckBox component presents an option for the user. The user can check the box to select the option, or uncheck it to deselect the option.
The Caption property can be used to…
DelphiVCL.RadioButton or TRadioButton is a wrapper for a system radio button.
Use TRadioButton to add a radio button to a form. Radio buttons present a set of mutually exclusive options to the user- that is, only one radio button in a set can be selected at a time.
delphivcl.Edit or TEdit is a wrapper for a Windows single-line edit control.
We can use an Edit object to put a standard Windows edit control on a form. Edit controls are used to retrieve text that users type. Edit controls can also display text to the user.
When only displaying text to the user, choose an edit control to allow users to select text and copy it to the Clipboard. Choose a…
When running dir() to DelphiVCL library or any DelphiVCL methods and properties in all previous sections, you might find many of Python’s built-in objects and properties. Previously, we already discussed about __doc__, __file__, __loader__, __name…
DelphiVCL.Point or TPoint is used to define a pixel location on-screen.
The TPoint type defines the integer type X and Y coordinates of a pixel location on-screen, with the origin in the upper-left corner. X and Y specify the horizontal and vertical coordinates of a…
DelphiVCL.Persistent or TPersistent is the ancestor for all objects that have assignment and streaming capabilities. TPersistent encapsulates the behavior common to all objects that can be assigned to other objects, and that can read and write their properties to and from a form file (.xfm or .dfm file).
For this purpose, DelphiVCL.Persistent introduces methods that can be overridden…
