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https://git.sr.ht/~eliasnaur/gio
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Chris Waldon
a87a520ae8
This introduces a new material.Palette type that captures the color information necessary to render a widget. This type is embedded in the material.Theme to make it easier to swap to a different palette for part of the UI by reassinging the Palette field. Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
84 lines
1.9 KiB
Go
84 lines
1.9 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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package material
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import (
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"image/color"
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"gioui.org/text"
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"gioui.org/unit"
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"gioui.org/widget"
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"golang.org/x/exp/shiny/materialdesign/icons"
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)
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// Palette contains the minimal set of colors that a widget may need to
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// draw itself.
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type Palette struct {
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// Bg is the background color atop which content is currently being
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// drawn.
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Bg color.NRGBA
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// Fg is a color suitable for drawing on top of Bg.
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Fg color.NRGBA
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// ContrastBg is a color used to draw attention to active,
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// important, interactive widgets such as buttons.
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ContrastBg color.NRGBA
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// ContrastFg is a color suitable for content drawn on top of
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// ContrastBg.
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ContrastFg color.NRGBA
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}
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type Theme struct {
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Shaper text.Shaper
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Palette
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TextSize unit.Value
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Icon struct {
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CheckBoxChecked *widget.Icon
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CheckBoxUnchecked *widget.Icon
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RadioChecked *widget.Icon
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RadioUnchecked *widget.Icon
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}
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}
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func NewTheme(fontCollection []text.FontFace) *Theme {
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t := &Theme{
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Shaper: text.NewCache(fontCollection),
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}
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t.Palette = Palette{
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Fg: rgb(0x000000),
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Bg: rgb(0xffffff),
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ContrastBg: rgb(0x3f51b5),
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ContrastFg: rgb(0xffffff),
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}
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t.TextSize = unit.Sp(16)
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t.Icon.CheckBoxChecked = mustIcon(widget.NewIcon(icons.ToggleCheckBox))
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t.Icon.CheckBoxUnchecked = mustIcon(widget.NewIcon(icons.ToggleCheckBoxOutlineBlank))
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t.Icon.RadioChecked = mustIcon(widget.NewIcon(icons.ToggleRadioButtonChecked))
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t.Icon.RadioUnchecked = mustIcon(widget.NewIcon(icons.ToggleRadioButtonUnchecked))
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return t
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}
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func (t Theme) WithPalette(p Palette) Theme {
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t.Palette = p
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return t
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}
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func mustIcon(ic *widget.Icon, err error) *widget.Icon {
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if err != nil {
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panic(err)
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}
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return ic
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}
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func rgb(c uint32) color.NRGBA {
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return argb(0xff000000 | c)
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}
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func argb(c uint32) color.NRGBA {
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return color.NRGBA{A: uint8(c >> 24), R: uint8(c >> 16), G: uint8(c >> 8), B: uint8(c)}
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}
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