Class GaugeCircle

Returns true if events are blocked; otherwise returns false.

If blocked is true, then events emitted by this event watcher will be blocked, meaning that emitting an event will not trigger any callback functions that are bound to it.

Returns the height of character.

Returns the list of children.

Returns the context of this canvas. It is used for drawing shapes, text, images, and other objects.

Sets the style of this widget. See also id addClass.

Returns the dom of this canvas.

Returns whether this widget or its parent chain is enabled or not. By default, the value of this property is true.

Sets whether this widget is enabled or not. Disabling a widget implicitly disables all its children, it is not possible to explicitly enable a child widget while its parent widget remains disabled.

Returns the height of this canvas.

Sets the height of this canvas to the given height, taking pixel ratio into account.

Returns the id of this widget.

Set the id of this widget to the given id. The id is utilized to set the style of the widget. See also css

Returns the left coordinate of this widget within its parent widget.

Sets the left coordinate of this widget within its parent widget.

Returns the parent of this widget, or undefined if it does not have any parent widget.

Sets the parent of the widget to the given parent. If the new parent widget is the old parent widget, this function does nothing.

Returns the pixel height of this canvas.

Returns the device pixel ratio. This property represents the ratio between the size of one CSS pixel and the size of one physical pixel. It is commonly used for HD-DPI devices to ensure that the output canvas is not blurred.

Returns the pixel size of this canvas.

Returns the pixel width of this canvas.

Returns the position of this widget within its parent widget.

Sets the position of this widget to the given position.

Returns the rect of this widget within the desktop.

Returns the size of this canvas.

Sets the size of this canvas to the given size, taking pixel ratio into account.

Returns the style of this widget.

Returns the tooltip of this widget. When the mouse hovers over the widget for a period of time(it can be set by Tooltip::WakeUpDelay), a message will automatically pop up, and it will disappear automatically when the mouse moves away. By default, the value of this property is an empty string.

Sets the tooltip of this widget to the given tooltip.

Returns the top coordinate of this widget within its parent widget.

Sets the top coordinate of this widget to the given top.

Returns whether this widget or its parent chain is visible or not. By default, the value of this property is true.

Sets whether this widget is visible or not. If an ancestor widget is not visible, the widget won't become visible until all its ancestors are visible.

Returns the width of this canvas.

Sets the width of this canvas to the given width, taking pixel ratio into account.

Returns the object that sent the event.

Adds the attribute of this widget. The attribute is utilized to set the style. See also css

Adds the class name of this widget. The class name is utilized to set the style. See also css. All widgets with the same class name use the same style.

Adds a callback function that's going to be called when the event is emitted.

Erases the entire canvas.

Clears all widgets in the list of children.

Closes this widget. This function is equivalent to setting this widget's parent to undefined. If the widget has no resources to free, call this function directly.

Delegates this event watcher to handle the given watcher's event named name.

Destroys the widget, all the widget's children are destroyed first. The widget is destroyed when it's parent is destroyed. When the widget is destroyed, make sure to release all resources, such as timers, etc. Releases the resources in the protected function free(), and the system will call this function automatically when the parent widget or itself is destroyed. See also free.

Emits an arbitrary set of arguments to the callback function which is bound to the event named name.

Returns whether this widget contains the attribute.

Returns whether this widget contains the class name.

Hides the widget and its child widgets. This function is equivalent to setting the visible property to false.

Inserts the child widget at index in the list of children.

Raises this widget to the front of the parent widget's children. The display order of this widget is determined by the order in which they appear in the parent widget's children.

Removes the attribute of this widget.

Removes the class name of this widget.

Sets whether the widget uses flex layout.

Shows the widget and its child widgets. This function is equivalent to setting the visible property to true.

If param attr is true, adds the attribute, otherwise removes the attribute.

If param on is true, adds the class name, otherwise removes the class name.

Removes the specified watcher for the event named name.

Batchs draw. this function will not do immediate draw, it will schedule drawing to next tick. See also Canvas.draw

Updates the size of this canvas When CSS size or pixel ratio is changed.