mirror of
https://github.com/xiaoqidun/ofdgo.git
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79 lines
3.2 KiB
Go
79 lines
3.2 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ofdgo
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import "fmt"
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// ObjectSelection 保存正文与注解的独立快照，共享当前编辑器的不可变资源
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// 来源修改、删除或撤销不改变快照，不用于跨文档传输
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type ObjectSelection struct {
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editor *Editor
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objects []GraphicObject
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annotations *AnnotationSelection
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}
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// CaptureSelection 捕获正文与注解，不修改文档或历史
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// 入参: page 页面索引, objects 正文标识, annotations 注解标识，各列表不得重复
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// 返回: *ObjectSelection 独立快照, error 标识或资源错误
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func (e *Editor) CaptureSelection(page int, objects, annotations []string) (*ObjectSelection, error) {
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items, err := e.Objects(page, objects)
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if err != nil {
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return nil, err
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}
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selection := &ObjectSelection{editor: e, objects: items}
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if len(annotations) != 0 {
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selection.annotations, err = e.CaptureAnnotations(page, annotations)
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if err != nil {
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return nil, err
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}
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}
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return selection, nil
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}
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// PasteSelection 原子粘贴正文与注解并平移，失败回滚，一次撤销恢复全部
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// 入参: page 目标页面索引, selection 当前编辑器快照, dx、dy 页面毫米位移
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// 返回: []string 新正文标识, []string 新注解标识, error 标识、资源或编辑错误
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func (e *Editor) PasteSelection(page int, selection *ObjectSelection, dx, dy float64) ([]string, []string, error) {
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if selection == nil || selection.editor != e || !finite(dx) || !finite(dy) {
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return nil, nil, fmt.Errorf("invalid object selection or offset")
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}
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var objects, annotations []string
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err := e.Transaction(func(edit *Editor) error {
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var err error
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objects, err = edit.CopyObjects(page, selection.objects, dx, dy)
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if err == nil && selection.annotations != nil {
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annotations, err = edit.PasteAnnotations(page, selection.annotations, dx, dy)
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}
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return err
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})
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if err != nil {
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return nil, nil, err
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}
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return objects, annotations, nil
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}
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// PasteSelectionToComposite 将正文快照粘贴至内部容器，保留源外观，拒绝嵌套注解
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// 入参: page 目标页面索引, path 父复合路径, selection 当前编辑器快照, dx、dy 页面毫米位移
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// 返回: []int 新成员序号, error 选区、资源或编辑错误
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func (e *Editor) PasteSelectionToComposite(page int, path ObjectPath, selection *ObjectSelection, dx, dy float64) ([]int, error) {
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if selection == nil || selection.editor != e {
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return nil, fmt.Errorf("object selection belongs to another editor")
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}
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if selection.annotations != nil {
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return nil, fmt.Errorf("annotations cannot be nested in a page object")
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}
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return e.CopyObjectsToComposite(page, path, selection.objects, dx, dy)
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}
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