62 lines
1.2 KiB
Go
62 lines
1.2 KiB
Go
package ui
|
|
|
|
import "opslag.de/schobers/geom"
|
|
|
|
type RenderBufferFn func(ctx Context, size geom.PointF32)
|
|
|
|
type Buffer struct {
|
|
im Image
|
|
size geom.PointF32
|
|
}
|
|
|
|
func (b *Buffer) Update(ctx Context, size geom.PointF32) error {
|
|
if b.im != nil {
|
|
if size == b.size {
|
|
return nil
|
|
}
|
|
b.im.Destroy()
|
|
b.im = nil
|
|
b.size = geom.ZeroPtF32
|
|
}
|
|
im, err := ctx.Renderer().CreateImageSize(size.X, size.Y)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
b.im = im
|
|
b.size = size
|
|
return nil
|
|
}
|
|
|
|
func (b *Buffer) Render(ctx Context, pos geom.PointF32, fn RenderBufferFn) {
|
|
if b.im == nil {
|
|
return
|
|
}
|
|
renderer := ctx.Renderer()
|
|
currTarget := renderer.Target()
|
|
renderer.RenderTo(b.im)
|
|
fn(ctx, b.size)
|
|
renderer.RenderTo(currTarget)
|
|
renderer.DrawImage(b.im, pos)
|
|
}
|
|
|
|
type BufferControl struct {
|
|
ControlBase
|
|
|
|
buffer Buffer
|
|
}
|
|
|
|
func (c *BufferControl) Arrange(ctx Context, bounds geom.RectangleF32, offset geom.PointF32) {
|
|
c.ControlBase.Arrange(ctx, bounds, offset)
|
|
c.buffer.Update(ctx, bounds.Size())
|
|
}
|
|
|
|
func (c *BufferControl) Render(ctx Context) {
|
|
c.RenderFn(ctx, c.RenderBuffer)
|
|
}
|
|
|
|
func (c *BufferControl) RenderFn(ctx Context, render RenderBufferFn) {
|
|
c.buffer.Render(ctx, c.bounds.Min, render)
|
|
}
|
|
|
|
func (c *BufferControl) RenderBuffer(ctx Context, size geom.PointF32) {}
|