64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
package ui
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import "git.kirsle.net/apps/doodle/render"
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// Widget is a user interface element.
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type Widget interface {
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Width() int32 // Get width
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Height() int32 // Get height
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SetWidth(int32) // Set
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SetHeight(int32) // Set
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Point() render.Point
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MoveTo(render.Point)
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MoveBy(render.Point)
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Size() render.Rect // Return the Width and Height of the widget.
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Resize(render.Rect)
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// Run any render computations; by the end the widget must know its
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// Width and Height. For example the Label widget will render itself onto
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// an SDL Surface and then it will know its bounding box, but not before.
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Compute(render.Engine)
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// Render the final widget onto the drawing engine.
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Present(render.Engine)
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}
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// BaseWidget holds common functionality for all widgets, such as managing
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// their widths and heights.
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type BaseWidget struct {
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width int32
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height int32
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point render.Point
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}
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// Point returns the X,Y position of the widget on the window.
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func (w *BaseWidget) Point() render.Point {
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return w.point
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}
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// MoveTo updates the X,Y position to the new point.
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func (w *BaseWidget) MoveTo(v render.Point) {
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w.point = v
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}
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// MoveBy adds the X,Y values to the widget's current position.
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func (w *BaseWidget) MoveBy(v render.Point) {
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w.point.X += v.X
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w.point.Y += v.Y
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}
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// Size returns the box with W and H attributes containing the size of the
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// widget. The X,Y attributes of the box are ignored and zero.
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func (w *BaseWidget) Size() render.Rect {
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return render.Rect{
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W: w.width,
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H: w.height,
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}
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}
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// Resize sets the size of the widget to the .W and .H attributes of a rect.
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func (w *BaseWidget) Resize(v render.Rect) {
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w.width = v.W
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w.height = v.H
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}
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