[−][src]Trait orbtk::prelude::Template
The Template trait defines the template of a particular type of a widget.
A widget's Template consists three type of objects:
- default values of its properties, children, handlers
- a render object
- a layout object
Provided methods
fn template(self, _id: Entity, _context: &mut BuildContext<'_>) -> Self
Builds the template of the widget and returns it.
Arguments
_id: The id (Entity) of the instantiated widget in the Entity Store_context: The BuildContext used to build and instantiate new widgets
Example
Define a widget called MyWidget with min, max and val properties with type of usize, and then set default values and add a TextBlock child.
widget!(MyWidget { min: usize, max: usize, val: usize }); impl Template for MyWidget { fn template(self, _id: Entity, context: &mut BuildContext) -> Self { self.name("MyWidget") .min(100) .max(1000) .val(500) .child(TextBlock::new().text("Set a value!").build(context)) } fn render_object(&self) -> Box<dyn RenderObject> { Box::new(RectangleRenderObject) } fn layout(&self) -> Box<dyn Layout> { Box::new(AbsoluteLayout) } }
fn render_object(&self) -> Box<dyn RenderObject + 'static>
Returns a pointer to a heap allocated object
which specifies how the widget should be drawn on the canvas.
For the list of available render objects, see the [render_object] module.
fn layout(&self) -> Box<dyn Layout + 'static>
Returns a pointer to a heap allocated object
which specifies the way in which the widget are arranged or laid out on the canvas.
For the list of available layout objects, see the [layout] module.