97 lines
2.2 KiB
Go
97 lines
2.2 KiB
Go
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// +build windows
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package dragdrop
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import (
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"unsafe"
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"golang.org/x/text/encoding/unicode"
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"opslag.de/schobers/geom"
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"opslag.de/schobers/zntg/ui"
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)
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/*
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#cgo LDFLAGS: -lole32 -luuid
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#include <Windows.h>
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#include <oleidl.h>
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#include <stdint.h>
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#include <stdlib.h>
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extern uint32_t RegisterHandler(void* windowHandle);
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*/
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import "C"
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//export clearFiles
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func clearFiles(handle uint32) {
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handler := handlers[handle]
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handler.Files = nil
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handlers[handle] = handler
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}
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//export addFile
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func addFile(handle uint32, pathNative *C.wchar_t, pathNativeLength C.UINT) {
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pathBytes := C.GoBytes(unsafe.Pointer(pathNative), C.int(pathNativeLength)*C.sizeof_wchar_t)
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decoder := unicode.UTF16(unicode.LittleEndian, unicode.UseBOM).NewDecoder()
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path, err := decoder.Bytes(pathBytes)
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if err != nil {
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return
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}
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handler := handlers[handle]
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handler.Files = append(handler.Files, string(path))
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handlers[handle] = handler
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}
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//export onDragEnter
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func onDragEnter(handle uint32, x, y C.LONG) {
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invokeHandler(handle, func(target ui.DragDropEventTarget, files []string) {
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target.DragEnter(pos(x, y), files)
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})
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}
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//export onDragOver
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func onDragOver(handle uint32, x, y C.LONG) {
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invokeHandler(handle, func(target ui.DragDropEventTarget, _ []string) {
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target.DragMove(pos(x, y))
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})
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}
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//export onDragLeave
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func onDragLeave(handle uint32) {
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invokeHandler(handle, func(target ui.DragDropEventTarget, _ []string) {
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target.DragLeave()
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})
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}
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//export onDrop
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func onDrop(handle uint32, x, y C.LONG) {
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invokeHandler(handle, func(target ui.DragDropEventTarget, files []string) {
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target.Drop(pos(x, y), files)
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})
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}
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type handler struct {
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Target ui.DragDropEventTarget
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Files []string
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}
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var handlers map[uint32]handler = map[uint32]handler{}
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func invokeHandler(handle uint32, invoke func(ui.DragDropEventTarget, []string)) {
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handler := handlers[handle]
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invoke(handler.Target, handler.Files)
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}
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func pos(x, y C.LONG) geom.PointF32 { return geom.Pt(int(x), int(y)).ToF32() }
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type provider struct{}
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func (p provider) Register(windowHandle uintptr, target ui.DragDropEventTarget) {
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handle := C.RegisterHandler(unsafe.Pointer(windowHandle))
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handlers[uint32(handle)] = handler{target, nil}
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}
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func init() {
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ui.DefaultDragDropProvider = provider{}
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}
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