35 lines
704 B
Go
35 lines
704 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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"github.com/shu-go/rog"
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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 is required")
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}
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alpha := toInt(args[0], 255)
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if g.Debug {
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rog.Printf("alpha = %v -> %v", args[0], alpha)
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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(alpha), lwaAlpha)
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if alpha == 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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