ScrollBar (gb.qt4)

This class provides a scroll bar with user-definable range.

Events are triggered when you drag, click or otherwise move the bar.

The scrollbar automatically becomes vertical if its height is greater than its width. Otherwise it is horizontal.

If the zoom of a scrollable area can be changed, it is helpful to adjust the thumb width as an indicator of the size of the scrollable area. But since the thumb width is a function of ScrollBar.PageStep and ScrollBar.MinValue and ScrollBar.Value, it is hard to control. See this code snippet for a translation between relative values (range 0.. ... 1.0) and ScrollBar properties: Precise control of the display of a scroll bar

Константы

Auto	Constant for an automatic orientation.
Horizontal	Constant for an horizontal orientation.
Vertical	Constant for a vertical orientation.

Свойства

DefaultSize	Return the scrollbar default size.
MaxValue	Returns or sets the maximum value of the ScrollBar.
MinValue	Returns or sets the minimum value of the ScrollBar.
Orientation	Return or set the ScrollBar orientation.
PageStep	Returns or sets the page increment.
Step	Returns or sets the step increment.
Tracking	Indicates that the ScrollBar emits Change events continuously when it is moved, not just the mouse button is released.
Value	Returns or sets the value of the ScrollBar.

Action	Returns or sets the action string associated with the control.
Background	Returns or sets the background color used by the control.
Cursor	Use this property for assigning a custom cursor to a control.
Design	Indicates that the control is in design mode.
Direction	Return or set the control text direction.
Drop	Returns or sets if a control accepts drops.
Enabled	Indicates that the control is enabled.
Expand	Returns or sets if a control will expand if included in a container that arranges its contents.
Font	Returns or sets the font used to draw text in the control.
Foreground	Returns or sets the foreground color used by the control.
H	A synonymous for the Height property.
Handle	Returns the internal X11 window handle of the control.
HasFocus	Returns whether the control has the focus.
Height	Returns or sets the height of the control.
Hovered	Returns whether the mouse cursor is inside the control.
Id	A synonymous for the Handle property.
Ignore	Returns or sets if a control must be ignored when its parent arranges its children.
Left	Returns or sets the position of the left border of the control relative to its parent.
Mouse	Returns or sets the appearence of the cursor when it points inside the control.
Name	Returns or sets the name of the control.
Next	Returns the next control having the same parent.
NoAnimation
NoTabFocus	Return or set if a control cannot be focused with the TAB key.
Parent	Returns the control container.
PopupMenu	Return or set the name of the menu that will be popped-up when the user presses the right mouse button or the keyboard MENU key.
Previous	Returns the previous control having the same parent.
Proxy	Return or set the "proxy" of a control.
ProxyFor	Return which control that control is a proxy for.
RightToLeft	Return if the control is right to left oriented.
ScreenX	Returns the position of the left border of the control in screen coordinates.
ScreenY	Returns the position of the top border of the control in screen coordinates.
Tag	Returns or sets the control tag.
Tooltip	Returns or sets the tooltip shown when the mouse stays on the control for a short time.
Top	Returns or sets the position of the top border of the control relative to its parent.
Visible	Indicates if the control is visible or not.
W	A synonymous for the Width property.
Width	Returns or sets the width of the control.
Window	Returns the top-level window that contains the control.
X	Returns or sets the position of the left border of the control relative to its parent.
Y	Returns or sets the position of the top border of the control relative to its parent.

Delete	Destroys the control.
Drag	Starts a drag & drop process.
Grab	Grab the keyboard and the mouse so that all keyboard and mouse events are received by the control.
Hide	Hides the control.
Lower	Sends the control to the background of its parent.
Move	Moves and/or resizes the control.
MoveScaled	Moves and/or resizes the control.
Raise	Sends the control to the foreground of its parent.
Refresh	Trigger a redraw of the control.
Reparent	Changes the container of a control.
Resize	Resizes the control.
ResizeScaled	Resizes the control.
SetFocus	Gives the focus to the control.
Show	Shows the control.

События

Change

Raised when the value of the ScrollBar has changed.

DblClick	Raised when the user quickly clicks twice on the control.
Drag	This event is raised when the mouse enters the control during a drag & drop process.
DragLeave	This event is raised when the mouse leaves the control during a drag & drop operation.
DragMove	This event is raised while the mouse moves inside the control during a drag & drop process.
Drop	This event is raised when a drag is dropped in the control.
Enter	Raised when the mouse enters the control.
GotFocus	Raised when the control has got the focus.
KeyPress	Raised when a key is pressed while the control has the focus.
KeyRelease	Raised when a key is released while the control has the focus.
Leave	Raised when the mouse leaves the control.
LostFocus	Raised when the control has lost the focus.
Menu	Raised when the user clicks on the control with the right mouse button, or if it hits the MENU key.
MouseDown	Raised when a mouse button is pressed while the cursor is inside the control.
MouseDrag	This event is raised when a drag operation should be started.
MouseMove	Raised when the mouse moves inside the control while a mouse button is pressed.
MouseUp	Raised when a mouse button is depressed while the cursor is inside the control.
MouseWheel	This event is raised when the user moves or presses the mouse wheel while the mouse is inside the control.