#include <WPaintedWidget>
Public Types | |
enum | Method { InlineSvgVml, HtmlCanvas } |
Enumeration that indicates a rendering method. More... | |
Public Member Functions | |
WPaintedWidget (WContainerWidget *parent=0) | |
Create a new painted widget. | |
~WPaintedWidget () | |
Destructor. | |
void | setPreferredMethod (Method method) |
Set the preferred rendering method. | |
Method | preferredMethod () const |
Get the preferred rendering method. | |
void | update () |
Let the widget repaint itself. | |
virtual void | resize (WLength width, WLength height) |
Resize the widget. | |
Protected Member Functions | |
virtual void | paintEvent (WPaintDevice *paintDevice)=0 |
Paint the widget. |
Depending on the browser, different rendering methods are used:
Browser | Methods | Default method |
Firefox 1.5+ | HtmlCanvas, InlineSVG | HtmlCanvas |
Internet Explorer 6.0+ | InlineVML | InlineVML |
Safari | HtmlCanvas, InlineSVG | HtmlCanvas |
Opera | InlineSVG, HtmlCanvas* | InlineSVG |
other | ? | HtmlCanvas |
If no JavaScript is available, the JavaScript-based HtmlCanvas will not be used, and InlineSVG will be used instead. The method used may be changed by using setPreferredMethod().
InlineSVG requires that the document is rendered as XHTML. This must be enabled in the configuration file using the <send-xhtml-mime-type> option. By default, this option is off.
To use a WPaintedWidget, you must derive from it and reimplement paintEvent(WPaintDevice *paintDevice). To paint on a WPaintDevice, you will need to use a WPainter. Repainting is triggered by calling the update() method.
A WPaintedWidget requires that its size is specified in pixel units using resize().
Enumeration that indicates a rendering method.
InlineSvgVml | SVG (Most browsers) or VML (Internet Explorer) embedded in the page. |
HtmlCanvas | The WHATWG HTML 5 canvas element. |
Reimplemented from Wt::WObject.
void Wt::WPaintedWidget::setPreferredMethod | ( | Method | method | ) |
Set the preferred rendering method.
When method is supported by the browser, then it is chosen for rendering.
Method Wt::WPaintedWidget::preferredMethod | ( | ) | const [inline] |
void Wt::WPaintedWidget::update | ( | ) |
Let the widget repaint itself.
Repainting is not immediate, but happens after when the event loop is exited.
Resize the widget.
Specify a new size for this widget, by specifying width and height. By default a widget has automatic width and height, see WLength::isAuto().
Reimplemented from Wt::WWebWidget.
virtual void Wt::WPaintedWidget::paintEvent | ( | WPaintDevice * | paintDevice | ) | [protected, pure virtual] |
Paint the widget.
You should reimplement this method to paint the contents of the widget, using the given paintDevice.