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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.
package walk
import . "github.com/lxn/go-winapi"
type tabPageListObserver interface {
onInsertingPage(index int, page *TabPage) error
onInsertedPage(index int, page *TabPage) error
onRemovingPage(index int, page *TabPage) error
onRemovedPage(index int, page *TabPage) error
onClearingPages(pages []*TabPage) error
onClearedPages(pages []*TabPage) error
}
type TabPageList struct {
items []*TabPage
observer tabPageListObserver
}
func newTabPageList(observer tabPageListObserver) *TabPageList {
return &TabPageList{observer: observer}
}
func (l *TabPageList) Add(item *TabPage) error {
return l.Insert(len(l.items), item)
}
func (l *TabPageList) At(index int) *TabPage {
return l.items[index]
}
func (l *TabPageList) Clear() error {
observer := l.observer
if observer != nil {
if err := observer.onClearingPages(l.items); err != nil {
return err
}
}
oldItems := l.items
l.items = l.items[:0]
if observer != nil {
if err := observer.onClearedPages(oldItems); err != nil {
l.items = oldItems
return err
}
}
return nil
}
func (l *TabPageList) Index(item *TabPage) int {
for i, lvi := range l.items {
if lvi == item {
return i
}
}
return -1
}
func (l *TabPageList) Contains(item *TabPage) bool {
return l.Index(item) > -1
}
func (l *TabPageList) indexHandle(handle HWND) int {
for i, page := range l.items {
if page.BaseWidget().hWnd == handle {
return i
}
}
return -1
}
func (l *TabPageList) containsHandle(handle HWND) bool {
return l.indexHandle(handle) > -1
}
func (l *TabPageList) insertIntoSlice(index int, item *TabPage) {
l.items = append(l.items, nil)
copy(l.items[index+1:], l.items[index:])
l.items[index] = item
}
func (l *TabPageList) Insert(index int, item *TabPage) error {
observer := l.observer
if observer != nil {
if err := observer.onInsertingPage(index, item); err != nil {
return err
}
}
l.insertIntoSlice(index, item)
if observer != nil {
if err := observer.onInsertedPage(index, item); err != nil {
l.items = append(l.items[:index], l.items[index+1:]...)
return err
}
}
return nil
}
func (l *TabPageList) Len() int {
return len(l.items)
}
func (l *TabPageList) Remove(item *TabPage) error {
index := l.Index(item)
if index == -1 {
return nil
}
return l.RemoveAt(index)
}
func (l *TabPageList) RemoveAt(index int) error {
observer := l.observer
item := l.items[index]
if observer != nil {
if err := observer.onRemovingPage(index, item); err != nil {
return err
}
}
l.items = append(l.items[:index], l.items[index+1:]...)
if observer != nil {
if err := observer.onRemovedPage(index, item); err != nil {
l.insertIntoSlice(index, item)
return err
}
}
return nil
}
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