39 lines
800 B
Go
39 lines
800 B
Go
//go:build windows
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// +build windows
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package vvin
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import (
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"errors"
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"os"
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"github.com/shu-go/nmfmt"
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)
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type alphaCmd struct {
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}
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func (c alphaCmd) Run(args []string, g globalCmd) error {
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if len(args) != 1 {
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return errors.New("an argument (opacity; 0%-100% or 0-255) is required")
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}
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opacity := toInt(args[0], 255)
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g.debug(os.Stderr, "opacity $=arg:q -> $opacity/255\n",
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nmfmt.M{
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"arg": args[0],
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"opacity": opacity,
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})
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style, _, _ := getWindowLong.Call(uintptr(g.targetHandle), gwlEXStyle)
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setWindowLong.Call(uintptr(g.targetHandle), gwlEXStyle, style|wsEXLayered)
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setLayeredWindowAttributes.Call(uintptr(g.targetHandle), 0, uintptr(opacity), lwaAlpha)
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if opacity == 255 {
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setWindowLong.Call(uintptr(g.targetHandle), gwlEXStyle, style&^wsEXLayered)
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}
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return nil
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}
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