mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-30 01:27:26 +08:00
408 lines
14 KiB
Go
408 lines
14 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 (
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"bytes"
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"encoding/xml"
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"fmt"
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"slices"
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)
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// AnnotationLink 表示外部地址或文档内目标，两者必须且只能指定一项
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type AnnotationLink struct {
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URI *URI
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Dest *Dest
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}
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// SetObjectLink 修改对象的单个点击链接，保留其他事件和点击区域，nil移除链接
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// 入参: page 页面索引, ids 对象标识, link 链接目标，不检查可达性
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// 返回: error 错误信息
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func (e *Editor) SetObjectLink(page int, ids []string, link *AnnotationLink) error {
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if link != nil {
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if _, err := annotationLinkXML(*link); err != nil {
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return err
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}
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}
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objects, _, err := e.selectedObjects(page, ids)
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if err != nil {
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return err
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}
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for i := range objects {
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var actions *[]Action
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switch objects[i].Type {
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case "TextObject":
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actions = &objects[i].TextObject.Actions
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case "PathObject":
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actions = &objects[i].PathObject.Actions
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case "ImageObject":
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actions = &objects[i].ImageObject.Actions
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case "CompositeObject", "CompositeGraphicUnit":
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actions = &objects[i].CompositeGraphicUnit.Actions
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default:
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return fmt.Errorf("object %q cannot contain links", ids[i])
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}
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*actions = cloneEditorData(*actions)
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index := -1
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for j, action := range *actions {
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if action.Event == "CLICK" && (action.URI != nil || action.Goto != nil) {
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if index >= 0 {
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return fmt.Errorf("object %q contains multiple click links", ids[i])
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}
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index = j
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}
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}
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if link == nil {
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if index >= 0 {
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*actions = slices.Delete(*actions, index, index+1)
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}
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continue
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}
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if index < 0 {
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index = len(*actions)
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*actions = append(*actions, Action{Event: "CLICK"})
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}
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action := &(*actions)[index]
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action.URI, action.Goto = cloneEditorData(link.URI), nil
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if link.Dest != nil {
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action.Goto = &Goto{Dest: cloneEditorData(link.Dest)}
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}
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}
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return e.updateObjects(page, objects, true)
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}
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// SetObjectActions 原子替换普通对象的动作，空列表移除动作
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// 入参: page 页面索引, ids 对象标识, actions 动作及已注册的资源引用
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// 返回: error 错误信息
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func (e *Editor) SetObjectActions(page int, ids []string, actions []Action) error {
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if err := validateObjectActions(actions); err != nil {
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return err
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}
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objects, _, err := e.selectedObjects(page, ids)
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if err != nil {
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return err
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}
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for i := range objects {
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switch objects[i].Type {
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case "TextObject":
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objects[i].TextObject.Actions = cloneEditorData(actions)
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case "PathObject", "Path":
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objects[i].PathObject.Actions = cloneEditorData(actions)
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case "ImageObject":
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objects[i].ImageObject.Actions = cloneEditorData(actions)
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case "CompositeObject", "CompositeGraphicUnit":
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objects[i].CompositeGraphicUnit.Actions = cloneEditorData(actions)
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default:
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return fmt.Errorf("object %q cannot contain actions", ids[i])
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}
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}
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return e.updateObjects(page, objects, true)
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}
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// validateObjectActions 校验新建对象的动作结构，目标不必可达
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// 入参: actions 动作列表
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// 返回: error 错误信息
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func validateObjectActions(actions []Action) error {
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for _, action := range actions {
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if !slices.Contains([]string{"CLICK", "DO", "PO"}, action.Event) {
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return fmt.Errorf("unsupported action event %q", action.Event)
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}
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count := 0
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for _, present := range []bool{action.URI != nil, action.Goto != nil, action.GotoA != nil, action.Sound != nil, action.Movie != nil} {
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if present {
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count++
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}
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}
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if count != 1 {
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return fmt.Errorf("specify one action target")
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}
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if action.GotoA != nil && action.GotoA.AttachID == "" {
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return fmt.Errorf("attachment action requires an attachment ID")
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}
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if sound := action.Sound; sound != nil {
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if sound.ResourceID == "" || sound.Volume != nil && (*sound.Volume < 0 || *sound.Volume > 100) {
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return fmt.Errorf("invalid sound action resource or volume")
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}
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}
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if movie := action.Movie; movie != nil {
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if movie.ResourceID == "" || !slices.Contains([]string{"", "Play", "Stop", "Pause", "Resume"}, movie.Operator) {
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return fmt.Errorf("invalid movie action resource or operator")
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}
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}
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if action.Goto != nil {
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if (action.Goto.Dest == nil) == (action.Goto.Bookmark == nil) {
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return fmt.Errorf("specify one destination or bookmark")
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}
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if action.Goto.Dest != nil {
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if _, err := annotationLinkXML(AnnotationLink{Dest: action.Goto.Dest}); err != nil {
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return err
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}
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}
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}
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if action.Region != nil {
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for _, area := range action.Region.Area {
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if _, err := creationNumbers(area.Start, 2); err != nil {
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return err
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}
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for _, command := range area.Command {
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var points []string
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switch command.Type {
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case "Line":
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points = []string{command.Point1}
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case "QuadraticBezier":
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points = []string{command.Point1, command.Point2}
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case "CubicBezier":
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points = []string{command.Point1, command.Point2, command.Point3}
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case "Close":
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default:
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return fmt.Errorf("unsupported new action region command %q", command.Type)
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}
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for _, point := range points {
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if _, err := creationNumbers(point, 2); err != nil {
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return err
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}
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}
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}
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}
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}
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}
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return nil
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}
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// AnnotationLink 读取注解中唯一的点击跳转，书签目标保持原始动作
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// 入参: page 页面索引, id 注解标识
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// 返回: Action 跳转动作, error 错误信息
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func (e *Editor) AnnotationLink(page int, id string) (Action, error) {
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data, err := e.annotationXML(page, id)
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if err != nil {
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return Action{}, err
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}
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root, err := parseEditorXML(data)
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if err != nil {
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return Action{}, err
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}
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targets, _ := annotationLinkNodes(root)
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if len(targets) != 1 {
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return Action{}, fmt.Errorf("annotation does not contain one link target")
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}
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var action Action
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node := targets[0].parent
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err = xml.Unmarshal(data[node.start:node.end], &action)
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return action, err
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}
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// annotationLinkNodes 获取外观内的点击跳转和基本对象，不进入私有扩展
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// 入参: root 注解根节点
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// 返回: []*editorXML 跳转目标, []*editorXML 基本对象
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func annotationLinkNodes(root *editorXML) ([]*editorXML, []*editorXML) {
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var targets, objects []*editorXML
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var walk func(*editorXML)
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walk = func(n *editorXML) {
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if n.name.Space != root.name.Space {
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return
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}
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if n.name.Local == "Action" && n.attr("Event") == "CLICK" {
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for _, child := range n.children {
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if child.name.Space == n.name.Space && (child.name.Local == "URI" || child.name.Local == "Goto") {
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targets = append(targets, child)
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}
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}
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}
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if slices.Contains([]string{"TextObject", "PathObject", "ImageObject"}, n.name.Local) {
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objects = append(objects, n)
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}
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for _, child := range n.children {
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walk(child)
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}
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}
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if appearance := root.child("Appearance"); appearance != nil {
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walk(appearance)
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}
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return targets, objects
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}
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// AddLinkAnnotation 新增标准链接注解，区域位于页面毫米坐标，不检查目标是否可达
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// 入参: page 页面索引, box 点击区域, target 链接目标, creator 作者
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// 返回: string 注解标识, error 错误信息
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func (e *Editor) AddLinkAnnotation(page int, box Box, target AnnotationLink, creator string) (string, error) {
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var id string
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err := e.Transaction(func(edit *Editor) error {
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if _, err := annotationLinkXML(target); err != nil {
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return err
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}
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object, err := NewShape(ShapeRectangle, Box{W: box.W, H: box.H})
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if err != nil {
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return err
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}
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no := false
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object.Fill, object.Stroke = &no, &no
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id, err = edit.AddAnnotation(page, Annotation{Type: "Link", Creator: creator, Appearance: Appearance{
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Boundary: editorBoxString(box), Objects: []GraphicObject{{Type: "PathObject", PathObject: object}},
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}})
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if err != nil {
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return err
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}
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return edit.UpdateAnnotationLink(page, id, target)
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})
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if err != nil {
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return "", err
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}
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return id, nil
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}
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// UpdateAnnotationLink 修改注解中唯一的点击跳转，保留动作区域、其他动作及扩展属性
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// 无跳转时仅允许在单个基本对象上添加，多个跳转不隐式合并
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// 入参: page 页面索引, id 注解标识, target 新目标，不验证目标可达性
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// 返回: error 错误信息
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func (e *Editor) UpdateAnnotationLink(page int, id string, target AnnotationLink) error {
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link, err := annotationLinkXML(target)
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if err != nil {
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return err
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}
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return e.editAnnotations(page, []string{id}, func(data []byte, node *editorXML) ([]byte, error) {
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data, err := editorXMLStandalone(data[node.start:node.end], node)
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if err != nil {
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return nil, err
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}
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root, err := parseEditorXML(data)
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if err != nil {
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return nil, err
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}
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targets, objects := annotationLinkNodes(root)
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if len(targets) > 1 {
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return nil, fmt.Errorf("annotation contains multiple link targets")
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}
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if len(targets) == 1 {
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n := targets[0]
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updated := link
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if n.name.Local == "URI" && target.URI != nil {
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var old URI
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if err := xml.Unmarshal(data[n.start:n.end], &old); err != nil {
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return nil, err
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}
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before, err := annotationLinkXML(AnnotationLink{URI: &old})
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if err != nil {
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return nil, err
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}
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updated, err = editorXMLMerge(data, n, before, link)
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if err != nil {
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return nil, err
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}
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} else if n.name.Local == "Goto" && target.Dest != nil && n.child("Dest") != nil {
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var old Goto
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if err := xml.Unmarshal(data[n.start:n.end], &old); err != nil {
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return nil, err
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}
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before, err := annotationLinkXML(AnnotationLink{Dest: old.Dest})
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if err != nil {
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return nil, err
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}
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updated, err = editorXMLMerge(data, n, before, link)
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if err != nil {
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return nil, err
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}
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} else {
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var check func(*editorXML) bool
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check = func(node *editorXML) bool {
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allowed := map[string]string{"URI": "URI Base", "Goto": "", "Dest": "Type PageID Left Right Top Bottom Zoom", "Bookmark": "Name"}
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attrs, known := allowed[node.name.Local]
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if !known || node.name.Space != root.name.Space || !editorXMLAttributes(node, attrs) {
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return false
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}
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for _, attr := range node.attrs {
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if attr.Name.Space != "" && attr.Name.Space != "xmlns" {
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return false
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}
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}
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for _, child := range node.children {
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if !check(child) {
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return false
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}
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}
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return true
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}
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if !check(n) {
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return nil, fmt.Errorf("changing link type would discard extension data")
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}
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}
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data = editorPatchXML(data, []editorXMLPatch{{n.start, n.end, updated}})
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} else {
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if len(objects) != 1 {
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return nil, fmt.Errorf("a new link requires one appearance object")
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}
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action, err := editorXMLContainer("Action", ofdAttrs{{Name: xml.Name{Local: "Event"}, Value: "CLICK"}}, link)
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if err != nil {
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return nil, err
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}
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action = bytes.TrimPrefix(action, []byte(xml.Header))
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if actions := objects[0].child("Actions"); actions != nil {
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data = editorPatchXML(data, []editorXMLPatch{editorXMLContent(data, actions, append(bytes.Clone(data[actions.open:actions.close]), action...))})
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} else {
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actions, err := editorXMLContainer("Actions", nil, action)
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if err != nil {
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return nil, err
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}
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position := objects[0].open
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data = editorPatchXML(data, []editorXMLPatch{{position, position, bytes.TrimPrefix(actions, []byte(xml.Header))}})
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}
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}
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return editorAnnotationDate(data)
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})
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}
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// annotationLinkXML 序列化标准跳转目标，不改写其他动作或命名空间
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// 入参: target 跳转目标
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// 返回: []byte 独立XML片段, error 错误信息
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func annotationLinkXML(target AnnotationLink) ([]byte, error) {
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if (target.URI == nil) == (target.Dest == nil) {
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return nil, fmt.Errorf("specify one URI or destination")
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}
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var data []byte
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var err error
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if target.URI != nil {
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attrs := ofdAttrs{{Name: xml.Name{Local: "URI"}, Value: target.URI.URI}}
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attrs.add("Base", target.URI.Base)
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data, err = editorXMLContainer("URI", attrs, nil)
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} else {
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dest := target.Dest
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if !slices.Contains([]string{"XYZ", "Fit", "FitH", "FitV", "FitR"}, dest.Type) {
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return nil, fmt.Errorf("invalid destination type %q", dest.Type)
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}
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attrs := ofdAttrs{{Name: xml.Name{Local: "Type"}, Value: dest.Type}, {Name: xml.Name{Local: "PageID"}, Value: dest.PageID}}
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for _, value := range []struct {
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name string
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value float64
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}{{"Left", dest.Left}, {"Top", dest.Top}, {"Right", dest.Right}, {"Bottom", dest.Bottom}, {"Zoom", dest.Zoom}} {
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if !finite(value.value) {
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return nil, fmt.Errorf("destination coordinates must be finite")
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}
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omit := dest.Type == "XYZ" && (value.name == "Left" && dest.OmitLeft || value.name == "Top" && dest.OmitTop || value.name == "Zoom" && dest.OmitZoom)
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omit = omit || dest.Type == "FitH" && value.name == "Top" && dest.OmitTop
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omit = omit || dest.Type == "FitV" && value.name == "Left" && dest.OmitLeft
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if omit {
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continue
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}
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if dest.Type == "XYZ" && slices.Contains([]string{"Left", "Top", "Zoom"}, value.name) || dest.Type == "FitH" && value.name == "Top" || dest.Type == "FitV" && value.name == "Left" || dest.Type == "FitR" && value.name != "Zoom" {
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attrs.add(value.name, ofdNumber(value.value))
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}
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}
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data, err = editorXMLContainer("Dest", attrs, nil)
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if err == nil {
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data, err = editorXMLContainer("Goto", nil, bytes.TrimPrefix(data, []byte(xml.Header)))
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}
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}
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return bytes.TrimPrefix(data, []byte(xml.Header)), err
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}
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