Golang Theme.CreateImage方法代碼示例

func createIconButton(driver gxui.Driver, theme gxui.Theme, iconPath string) gxui.Button {
	button := theme.CreateButton()
	button.SetType(gxui.PushButton)

	fileBytes, err := assets.Asset(iconPath)
	if err != nil {
		log.Printf("Error: Failed to read asset %s: %s", iconPath, err)
		return button
	}
	f := bytes.NewBuffer(fileBytes)
	src, _, err := image.Decode(f)
	if err != nil {
		log.Printf("Error: Failed to decode image %s: %s", iconPath, err)
		return button
	}
	src = resize.Resize(24, 24, src, resize.Bilinear)

	rgba := image.NewRGBA(src.Bounds())
	draw.Draw(rgba, src.Bounds(), src, image.ZP, draw.Src)
	texture := driver.CreateTexture(rgba, 1)

	icon := theme.CreateImage()
	icon.SetTexture(texture)
	button.AddChild(icon)
	return button
}

func (a *customAdapter) Create(theme gxui.Theme, index int) gxui.Control {
	phase := float32(index) / 1000
	c := gxui.Color{
		R: 0.5 + 0.5*math.Sinf(math.TwoPi*(phase+0.000)),
		G: 0.5 + 0.5*math.Sinf(math.TwoPi*(phase+0.333)),
		B: 0.5 + 0.5*math.Sinf(math.TwoPi*(phase+0.666)),
		A: 1.0,
	}
	i := theme.CreateImage()
	i.SetBackgroundBrush(gxui.CreateBrush(c))
	i.SetMargin(math.Spacing{L: 3, T: 3, R: 3, B: 3})
	i.OnMouseEnter(func(ev gxui.MouseEvent) {
		i.SetBorderPen(gxui.CreatePen(2, gxui.Gray80))
	})
	i.OnMouseExit(func(ev gxui.MouseEvent) {
		i.SetBorderPen(gxui.TransparentPen)
	})
	i.OnMouseDown(func(ev gxui.MouseEvent) {
		i.SetBackgroundBrush(gxui.CreateBrush(c.MulRGB(0.7)))
	})
	i.OnMouseUp(func(ev gxui.MouseEvent) {
		i.SetBackgroundBrush(gxui.CreateBrush(c))
	})
	return i
}

// Color picker uses the customAdapter for driving a list
func colorPicker(theme gxui.Theme) gxui.Control {
	layout := theme.CreateLinearLayout()
	layout.SetDirection(gxui.TopToBottom)

	label0 := theme.CreateLabel()
	label0.SetText("Color palette:")
	layout.AddChild(label0)

	adapter := &customAdapter{}

	list := theme.CreateList()
	list.SetAdapter(adapter)
	list.SetOrientation(gxui.Horizontal)
	layout.AddChild(list)

	label1 := theme.CreateLabel()
	label1.SetMargin(math.Spacing{T: 30})
	label1.SetText("Selected color:")
	layout.AddChild(label1)

	selected := theme.CreateImage()
	selected.SetExplicitSize(math.Size{W: 32, H: 32})
	layout.AddChild(selected)

	list.OnSelectionChanged(func(item gxui.AdapterItem) {
		if item != nil {
			control := list.ItemControl(item)
			selected.SetBackgroundBrush(control.(gxui.Image).BackgroundBrush())
		}
	})

	return layout
}

func (treeControlCreator) Create(theme gxui.Theme, control gxui.Control, node *mixins.TreeToListNode) gxui.Control {
	img := theme.CreateImage()
	imgSize := math.Size{W: 10, H: 10}

	ll := theme.CreateLinearLayout()
	ll.SetDirection(gxui.LeftToRight)

	btn := theme.CreateButton()
	btn.SetBackgroundBrush(gxui.TransparentBrush)
	btn.SetBorderPen(gxui.CreatePen(1, gxui.Gray30))
	btn.SetMargin(math.Spacing{L: 1, R: 1, T: 1, B: 1})
	btn.OnClick(func(ev gxui.MouseEvent) {
		if ev.Button == gxui.MouseButtonLeft {
			node.ToggleExpanded()
		}
	})
	btn.AddChild(img)

	update := func() {
		expanded := node.IsExpanded()
		canvas := theme.Driver().CreateCanvas(imgSize)
		btn.SetVisible(!node.IsLeaf())
		switch {
		case !btn.IsMouseDown(gxui.MouseButtonLeft) && expanded:
			canvas.DrawPolygon(expandedPoly, gxui.TransparentPen, gxui.CreateBrush(gxui.Gray70))
		case !btn.IsMouseDown(gxui.MouseButtonLeft) && !expanded:
			canvas.DrawPolygon(collapsedPoly, gxui.TransparentPen, gxui.CreateBrush(gxui.Gray70))
		case expanded:
			canvas.DrawPolygon(expandedPoly, gxui.TransparentPen, gxui.CreateBrush(gxui.Gray30))
		case !expanded:
			canvas.DrawPolygon(collapsedPoly, gxui.TransparentPen, gxui.CreateBrush(gxui.Gray30))
		}
		canvas.Complete()
		img.SetCanvas(canvas)
	}
	btn.OnMouseDown(func(gxui.MouseEvent) { update() })
	btn.OnMouseUp(func(gxui.MouseEvent) { update() })
	update()

	gxui.WhileAttached(btn, node.OnChange, update)

	ll.AddChild(btn)
	ll.AddChild(control)
	ll.SetPadding(math.Spacing{L: 16 * node.Depth()})
	return ll
}