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