Control Class |  |
Provide the base class from which all X# controls are subclassed.
Inheritance HierarchyNamespace: VO
Assembly: VOGUIClasses (in VOGUIClasses.dll) Version: 2.21
SyntaxThe Control type exposes the following members.
ConstructorsProperties| Name | Description | |
|---|---|---|
 | Background |
The brush used for painting the background of the control. For example, in a single line edit control, the background is the color behind the text in the edit control.
|
| Caption |
A string representing the caption of the control (i.e., the static text identifying the control)
|
| ContextMenu |
A menu object representing the local pop-up menu for a control.
|
| ControlID |
A number between 1 and 8000 representing the unique ID of a control
|
| FieldSpec |
The field specification connected to the control.
|
| HyperLabel |
The hyperlabel connected to the control.
|
| Modified |
A logical value that is set to TRUE when a standard edit control or editable combo box is in the process of being modified.
|
| Name |
A string representing the name of the control.
|
| NameSym |
A symbol representing the name of the control.
|
| Origin |
A point representing the location of a control on its owner window, in canvas coordinates.
|
| Owner |
The owner window of a control.
|
| OwnerAlignment |
Constant representing how the window will be aligned within its owner window.
|
| ReadOnly |
Is the control readonly ?
|
| Server |
The server object that currently connected to this control. If no server is connected, the value is NIL.
|
| Size |
A dimension representing the size of a control.
|
| Status |
A hyperlabel indicating the status of the control after a validation attempt or other action.
|
 | TextValue |
A string representing the value held in the control.
|
| ToolTipText |
String value representing the tooltip text used when the user moves the mouse pointer over the control.
|
| UseHLForToolTip |
Logical value determining whether the descriptive text of a control's Hyperlabel should be used as the tooltip text.
|
| Value |
The value held in the control, in whatever data type the control holds.
|
| ValueChanged |
A logical value representing whether the control's Value has been changed from its prior setting.
|
Methods| Name | Description | |
|---|---|---|
 | Activate |
Provide a method that is invoked when the control has focus and a window is activated. |
| AsString |
Return the contents of the control (or its identifying label).
|
| Create |
Creates the underlying Win32 control
|
| Deactivate |
Provide a method that is invoked when the control has focus and a window is deactivated. |
| DEFAULT | Call the default windows procedure for a control and set the EventReturnValue. |
| Destroy |
Provide a method to de-instantiate any Control object.
(Overrides Destroy.) |
| Disable |
Disable a control (until a subsequent call to Control:Enable()).
|
| DisableTheme |
Disable the WinXP theme for a control.
|
| Dispatch |
Provide the prototype dispatcher for events within the system when the control has focus; routing various events to their appropriate event handlers. |
| Enable |
Enable a control that was previously disabled.
|
| Expose |
Provide a method that is invoked when the control has focus and whenever part of the window needs repainting. |
| FocusChange |
Provide a method that is invoked when the control has focus and the input focus changes from the current control to another (or vice versa). |
| GetExStyle |
Retrieve the Ex styles for the control.
|
| GetStyle |
Retrieve the styles for the control.
|
| Handle |
Return the handle for a control.
|
| HasBorder | Check if a border has been set for the control |
| HasStyle | Check if a style value has been set for the control |
| Hide |
Hide a control so it is not visible (until a subsequent call to Control:Show()).
|
| HorizontalScroll |
Provide a method that is invoked when the control has focus and a horizontal scroll bar is scrolled. |
| IsEnabled |
Report if this control is currently enabled.
|
| IsExStyle | Check if a exstyle value has been set for the control |
| IsReadOnly |
Report if this control is currently readonly.
|
| IsStyle | Check if a style value has been set for the control |
| IsVisible |
Report if this control is visible (completely or partially) or hidden.
|
| KeyDown |
Provide a method that is invoked when the control has focus and a key on the keyboard is pressed. |
| KeyUp |
Provide a method that is invoked when the control has focus and a key on the keyboard is released. |
| LinkDF |
Connect a control to a data field in a data server.
|
| MenuInit |
Provide a method that is invoked when a pop-up menu owned by the control is about to pop up.
|
| MenuSelect |
Provide a method that is invoked when an item on a menu owned by the control is highlighted.
|
| MouseButtonDoubleClick |
Provide a method that is invoked when the control has focus, the mouse pointer is positioned over the window, and a mouse button is double-clicked. |
| MouseButtonDown |
Provide a method that is invoked when the control has focus, the mouse pointer is positioned over the window, and a mouse button is clicked. |
| MouseButtonUp |
Provide a method that is invoked when the control has focus, the mouse pointer is positioned over the window, and a mouse button is released.
|
| MouseDrag |
Provide a method that is invoked when the control has focus and a mouse with one or more buttons clicked is moved in the window.
|
| MouseMove |
Provide a method that is invoked when the control has focus and the mouse is moved in the control.
|
| Move |
Provide a method that is invoked when the control has focus and the control is moved (either by the user or by the application).
|
| OverRide | This is a compatibility method that is no longer used or needed. |
| PerformValidations |
Perform all the validations defined to this control's field specification (for example, required, maximum and minimum digits, maximum and minimum value, validation rule) and return the result of the test.
|
| RegisterTimer |
Register a timer method to be invoked for the control.
|
| RePaint |
Send an ExposeEvent to repaint the control
|
| Resize |
Provide a method that is invoked when the control has focus and the control changes size.
|
| RestoreUpdate |
Resume all drawing updates for a control (after Control:SuspendUpdate() is called).
|
| SetExStyle |
Set the exstyle for the control.
|
| SetFocus |
Pass input focus to a control, thereby directing all mouse and keyboard input to the control.
|
| SetParent |
Change the parent handle for the control.
|
| SetStyle |
Set the style for the control.
|
| Show |
Display a control so it is visible.
|
| SuspendUpdate |
Temporarily suspend all drawing updates for a control; drawing resumes with a call to Control:RestoreUpdate().
|
| Timer |
Provide a method to be invoked at specific intervals defined when the timer is registered though the RegisterTimer() method.
|
| ValidateControl | This method validates if the control has been created and when not then it triggers the control creation |
| VerticalScroll |
Provide a method that is invoked when the control has focus and a vertical scroll bar is scrolled.
|
Fields| Name | Description | |
|---|---|---|
 | EventReturnValue | |
| oCargo | Cargo slot. (Inherited from VObject.) |
Remarks
Control is the base class for a major system class hierarchy. Controls provide an easy mechanism for user I/O. They are self-contained and notify their respective owners when the user takes some action (such as pressing a button or entering text).
Controls on dialog windows created from resource entity templates are shown automatically when the dialog window is shown. However, if the application wishes to manipulate a control, it must register the control by creating a system object of the appropriate type.
Controls must appear in an owner window. They also need to know where to appear. There are two basic ways you can specify where; one is by placing the control using the Window Editor. In this case, X# generates a resource to represent the control. When you construct the control in your program, you pass to the constructor the ID of the resource as its second argument. The other way is to place the controls dynamically, in which case, you pass the position and size of the control as the third and fourth arguments (the first argument is always the owner and the second argument is always the resource ID). Even when you place the control dynamically, you pass in a unique ID as the second argument.
See AlsoReference
Inheritance Hierarchy