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// Copyright 2011 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
package walk
import (
"github.com/lxn/win"
"syscall"
)
type DropFilesEventHandler func([]string)
type DropFilesEvent struct {
hWnd win.HWND
handlers []DropFilesEventHandler
}
func (e *DropFilesEvent) Attach(handler DropFilesEventHandler) int {
if len(e.handlers) == 0 {
win.DragAcceptFiles(e.hWnd, true)
}
for i, h := range e.handlers {
if h == nil {
e.handlers[i] = handler
return i
}
}
e.handlers = append(e.handlers, handler)
return len(e.handlers) - 1
}
func (e *DropFilesEvent) Detach(handle int) {
e.handlers[handle] = nil
for _, h := range e.handlers {
if h != nil {
return
}
}
win.DragAcceptFiles(e.hWnd, false)
}
type DropFilesEventPublisher struct {
event DropFilesEvent
}
func (p *DropFilesEventPublisher) Event(hWnd win.HWND) *DropFilesEvent {
p.event.hWnd = hWnd
return &p.event
}
func (p *DropFilesEventPublisher) Publish(hDrop win.HDROP) {
var files []string
n := win.DragQueryFile(hDrop, 0xFFFFFFFF, nil, 0)
for i := 0; i < int(n); i++ {
bufSize := uint(512)
buf := make([]uint16, bufSize)
if win.DragQueryFile(hDrop, uint(i), &buf[0], bufSize) > 0 {
files = append(files, syscall.UTF16ToString(buf))
}
}
win.DragFinish(hDrop)
for _, handler := range p.event.handlers {
if handler != nil {
handler(files)
}
}
}
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