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treeview.go
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treeview.go
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//go:build windows
/*
* Copyright (C) 2019 The Winc Authors. All Rights Reserved.
*/
package winc
import (
"errors"
"syscall"
"unsafe"
"github.com/rribou/wails/v2/internal/frontend/desktop/windows/winc/w32"
)
// TreeItem represents an item in a TreeView widget.
type TreeItem interface {
Text() string // Text returns the text of the item.
ImageIndex() int // ImageIndex is used only if SetImageList is called on the treeview
}
type treeViewItemInfo struct {
handle w32.HTREEITEM
child2Handle map[TreeItem]w32.HTREEITEM
}
// StringTreeItem is helper for basic string lists.
type StringTreeItem struct {
Data string
Image int
}
func (s StringTreeItem) Text() string { return s.Data }
func (s StringTreeItem) ImageIndex() int { return s.Image }
type TreeView struct {
ControlBase
iml *ImageList
item2Info map[TreeItem]*treeViewItemInfo
handle2Item map[w32.HTREEITEM]TreeItem
currItem TreeItem
onSelectedChange EventManager
onExpand EventManager
onCollapse EventManager
onViewChange EventManager
}
func NewTreeView(parent Controller) *TreeView {
tv := new(TreeView)
tv.InitControl("SysTreeView32", parent, 0, w32.WS_CHILD|w32.WS_VISIBLE|
w32.WS_BORDER|w32.TVS_HASBUTTONS|w32.TVS_LINESATROOT|w32.TVS_SHOWSELALWAYS|
w32.TVS_TRACKSELECT /*|w32.WS_EX_CLIENTEDGE*/)
tv.item2Info = make(map[TreeItem]*treeViewItemInfo)
tv.handle2Item = make(map[w32.HTREEITEM]TreeItem)
RegMsgHandler(tv)
tv.SetFont(DefaultFont)
tv.SetSize(200, 400)
if err := tv.SetTheme("Explorer"); err != nil {
// theme error is ignored
}
return tv
}
func (tv *TreeView) EnableDoubleBuffer(enable bool) {
if enable {
w32.SendMessage(tv.hwnd, w32.TVM_SETEXTENDEDSTYLE, 0, w32.TVS_EX_DOUBLEBUFFER)
} else {
w32.SendMessage(tv.hwnd, w32.TVM_SETEXTENDEDSTYLE, w32.TVS_EX_DOUBLEBUFFER, 0)
}
}
// SelectedItem is current selected item after OnSelectedChange event.
func (tv *TreeView) SelectedItem() TreeItem {
return tv.currItem
}
func (tv *TreeView) SetSelectedItem(item TreeItem) bool {
var handle w32.HTREEITEM
if item != nil {
if info := tv.item2Info[item]; info == nil {
return false // invalid item
} else {
handle = info.handle
}
}
if w32.SendMessage(tv.hwnd, w32.TVM_SELECTITEM, w32.TVGN_CARET, uintptr(handle)) == 0 {
return false // set selected failed
}
tv.currItem = item
return true
}
func (tv *TreeView) ItemAt(x, y int) TreeItem {
hti := w32.TVHITTESTINFO{Pt: w32.POINT{int32(x), int32(y)}}
w32.SendMessage(tv.hwnd, w32.TVM_HITTEST, 0, uintptr(unsafe.Pointer(&hti)))
if item, ok := tv.handle2Item[hti.HItem]; ok {
return item
}
return nil
}
func (tv *TreeView) Items() (list []TreeItem) {
for item := range tv.item2Info {
list = append(list, item)
}
return list
}
func (tv *TreeView) InsertItem(item, parent, insertAfter TreeItem) error {
var tvins w32.TVINSERTSTRUCT
tvi := &tvins.Item
tvi.Mask = w32.TVIF_TEXT // w32.TVIF_CHILDREN | w32.TVIF_TEXT
tvi.PszText = uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(item.Text()))) // w32.LPSTR_TEXTCALLBACK
tvi.CChildren = 0 // w32.I_CHILDRENCALLBACK
if parent == nil {
tvins.HParent = w32.TVI_ROOT
} else {
info := tv.item2Info[parent]
if info == nil {
return errors.New("winc: invalid parent")
}
tvins.HParent = info.handle
}
if insertAfter == nil {
tvins.HInsertAfter = w32.TVI_LAST
} else {
info := tv.item2Info[insertAfter]
if info == nil {
return errors.New("winc: invalid prev item")
}
tvins.HInsertAfter = info.handle
}
tv.applyImage(tvi, item)
hItem := w32.HTREEITEM(w32.SendMessage(tv.hwnd, w32.TVM_INSERTITEM, 0, uintptr(unsafe.Pointer(&tvins))))
if hItem == 0 {
return errors.New("winc: TVM_INSERTITEM failed")
}
tv.item2Info[item] = &treeViewItemInfo{hItem, make(map[TreeItem]w32.HTREEITEM)}
tv.handle2Item[hItem] = item
return nil
}
func (tv *TreeView) UpdateItem(item TreeItem) bool {
it := tv.item2Info[item]
if it == nil {
return false
}
tvi := &w32.TVITEM{
Mask: w32.TVIF_TEXT,
HItem: it.handle,
PszText: uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(item.Text()))),
}
tv.applyImage(tvi, item)
if w32.SendMessage(tv.hwnd, w32.TVM_SETITEM, 0, uintptr(unsafe.Pointer(tvi))) == 0 {
return false
}
return true
}
func (tv *TreeView) DeleteItem(item TreeItem) bool {
it := tv.item2Info[item]
if it == nil {
return false
}
if w32.SendMessage(tv.hwnd, w32.TVM_DELETEITEM, 0, uintptr(it.handle)) == 0 {
return false
}
delete(tv.item2Info, item)
delete(tv.handle2Item, it.handle)
return true
}
func (tv *TreeView) DeleteAllItems() bool {
if w32.SendMessage(tv.hwnd, w32.TVM_DELETEITEM, 0, 0) == 0 {
return false
}
tv.item2Info = make(map[TreeItem]*treeViewItemInfo)
tv.handle2Item = make(map[w32.HTREEITEM]TreeItem)
return true
}
func (tv *TreeView) Expand(item TreeItem) bool {
if w32.SendMessage(tv.hwnd, w32.TVM_EXPAND, w32.TVE_EXPAND, uintptr(tv.item2Info[item].handle)) == 0 {
return false
}
return true
}
func (tv *TreeView) Collapse(item TreeItem) bool {
if w32.SendMessage(tv.hwnd, w32.TVM_EXPAND, w32.TVE_COLLAPSE, uintptr(tv.item2Info[item].handle)) == 0 {
return false
}
return true
}
func (tv *TreeView) EnsureVisible(item TreeItem) bool {
if info := tv.item2Info[item]; info != nil {
return w32.SendMessage(tv.hwnd, w32.TVM_ENSUREVISIBLE, 0, uintptr(info.handle)) != 0
}
return false
}
func (tv *TreeView) SetImageList(imageList *ImageList) {
w32.SendMessage(tv.hwnd, w32.TVM_SETIMAGELIST, 0, uintptr(imageList.Handle()))
tv.iml = imageList
}
func (tv *TreeView) applyImage(tc *w32.TVITEM, item TreeItem) {
if tv.iml != nil {
tc.Mask |= w32.TVIF_IMAGE | w32.TVIF_SELECTEDIMAGE
tc.IImage = int32(item.ImageIndex())
tc.ISelectedImage = int32(item.ImageIndex())
}
}
func (tv *TreeView) OnSelectedChange() *EventManager {
return &tv.onSelectedChange
}
func (tv *TreeView) OnExpand() *EventManager {
return &tv.onExpand
}
func (tv *TreeView) OnCollapse() *EventManager {
return &tv.onCollapse
}
func (tv *TreeView) OnViewChange() *EventManager {
return &tv.onViewChange
}
// Message processer
func (tv *TreeView) WndProc(msg uint32, wparam, lparam uintptr) uintptr {
switch msg {
case w32.WM_NOTIFY:
nm := (*w32.NMHDR)(unsafe.Pointer(lparam))
switch nm.Code {
case w32.TVN_ITEMEXPANDED:
nmtv := (*w32.NMTREEVIEW)(unsafe.Pointer(lparam))
switch nmtv.Action {
case w32.TVE_COLLAPSE:
tv.onCollapse.Fire(NewEvent(tv, nil))
case w32.TVE_COLLAPSERESET:
case w32.TVE_EXPAND:
tv.onExpand.Fire(NewEvent(tv, nil))
case w32.TVE_EXPANDPARTIAL:
case w32.TVE_TOGGLE:
}
case w32.TVN_SELCHANGED:
nmtv := (*w32.NMTREEVIEW)(unsafe.Pointer(lparam))
tv.currItem = tv.handle2Item[nmtv.ItemNew.HItem]
tv.onSelectedChange.Fire(NewEvent(tv, nil))
case w32.TVN_GETDISPINFO:
tv.onViewChange.Fire(NewEvent(tv, nil))
}
}
return w32.DefWindowProc(tv.hwnd, msg, wparam, lparam)
}