DrawingArea (gb.qt4)

This control implements an area that can be drawn by the application. It has two behaviors, standard and cached, defined by the Cached property.

• In standard mode, The DrawingArea will raise the Draw event each time it needs to be refreshed.

• In cached mode, The drawing is done once, by using the DrawingArea control as a drawing device. This drawing is stored inside an internal Picture that is used by the DrawingArea to refresh itself.

By default, the drawing must be done by using the Draw class. If you set the Painted property, the drawing will have to be done by the Paint class, and so will be anti-aliased.

Properties

Arrangement	Returns or sets how this container arrange its children controls.
AutoResize	Indicates that the container automatically resizes to the size of its contents.
Background	Returns or sets the background color used by the control.
Border	Returns or sets the border type of the control.
Cached	Returns or sets if the DrawingArea contents are cached into a internal Picture object.
Centered	Center controls horizontally or vertically according to the container arrangement.
Enabled	Returns or sets if the drawing area is enabled.
Focus	Returns or sets if the control accepts keyboard events and focus.
Indent	Returns or sets if the children controls of the container are indented.
Invert	Return or set if the horizontal or vertical arrangement direction is inverted.
Margin	Returns or sets if there is a margin between the container border and all its children.
NoBackground	Return or set if the DrawingArea automatically draws its background.
NoMouse	Return or set if the control is transparent to mouse events.
Padding	Returns or sets the number of pixels used as space between children controls, or container inner margin.
Painted	Return or set if the Paint class must be used to draw on the DrawingArea instead of the Draw class.
Spacing	Returns or sets if the children of the container are spaced out.
Tablet	Return or set if the DrawingArea will receive tablet events as mouse events.

Action	Returns or sets the action string associated with the control.
Children	Returns a collection of each control included in the container.
ClientH	A synonymous for the ClientHeight property.
ClientHeight	Returns the height of the area containing the controls.
ClientW	A synonymous for the ClientWidth property.
ClientWidth	Returns the width of the area containing the controls.
ClientX	Returns the position of the left border of the area containing the controls.
ClientY	Returns the position of the top border of the area containing the controls.
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.
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.
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.
Tracking	Returns or sets if the control will receive MouseMove events.
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.

Methods

Clear	Clears the drawing area.
Refresh	Trigger a redraw of the control.

Delete	Destroys the control.
Drag	Starts a drag & drop process.
FindChild	Finds the first child control pointed by the X and Y coordinates.
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.
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.

Events

Change	This event is raised when a global desktop configuration has changed.
Draw	Raised when something must be redrawn.
Font	This event is raised when the DrawingArea font has changed for any reason.

Arrange	This event is raised when a container has just finished arranging its contents.
BeforeArrange	This event is raised just before a container arranges its contents.
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.
NewChild	This event is raised when a new child Control has just been inserted into the container.

See also