Noah Petherbridge
41e1838549
* The shell now supports an "eval" command, or "$" for short.
* Runs it in an Otto JavaScript VM.
* Some global variables are available, like `d` is the Doodle object
itself, `log`, `RGBA()` and `Point()`
* The shell supports paging through input history using the arrow keys.
* Added an initial Main Scene
64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
package ui
|
|
|
|
import "git.kirsle.net/apps/doodle/render"
|
|
|
|
// Widget is a user interface element.
|
|
type Widget interface {
|
|
Width() int32 // Get width
|
|
Height() int32 // Get height
|
|
SetWidth(int32) // Set
|
|
SetHeight(int32) // Set
|
|
Point() render.Point
|
|
MoveTo(render.Point)
|
|
MoveBy(render.Point)
|
|
Size() render.Rect // Return the Width and Height of the widget.
|
|
Resize(render.Rect)
|
|
|
|
// Run any render computations; by the end the widget must know its
|
|
// Width and Height. For example the Label widget will render itself onto
|
|
// an SDL Surface and then it will know its bounding box, but not before.
|
|
Compute(render.Engine)
|
|
|
|
// Render the final widget onto the drawing engine.
|
|
Present(render.Engine)
|
|
}
|
|
|
|
// BaseWidget holds common functionality for all widgets, such as managing
|
|
// their widths and heights.
|
|
type BaseWidget struct {
|
|
width int32
|
|
height int32
|
|
point render.Point
|
|
}
|
|
|
|
// Point returns the X,Y position of the widget on the window.
|
|
func (w *BaseWidget) Point() render.Point {
|
|
return w.point
|
|
}
|
|
|
|
// MoveTo updates the X,Y position to the new point.
|
|
func (w *BaseWidget) MoveTo(v render.Point) {
|
|
w.point = v
|
|
}
|
|
|
|
// MoveBy adds the X,Y values to the widget's current position.
|
|
func (w *BaseWidget) MoveBy(v render.Point) {
|
|
w.point.X += v.X
|
|
w.point.Y += v.Y
|
|
}
|
|
|
|
// Size returns the box with W and H attributes containing the size of the
|
|
// widget. The X,Y attributes of the box are ignored and zero.
|
|
func (w *BaseWidget) Size() render.Rect {
|
|
return render.Rect{
|
|
W: w.width,
|
|
H: w.height,
|
|
}
|
|
}
|
|
|
|
// Resize sets the size of the widget to the .W and .H attributes of a rect.
|
|
func (w *BaseWidget) Resize(v render.Rect) {
|
|
w.width = v.W
|
|
w.height = v.H
|
|
}
|