im/pages/conversation/chating/components/ChatingFooter/SimpleEditor.vue

<template>
	<view class="simple_editor_wrap">
		<textarea
			class="simple_editor_textarea"
			:value="textValue"
			:placeholder="placeholder"
			:auto-height="true"
			:maxlength="maxlength"
			:show-confirm-bar="false"
			:hold-keyboard="true"
			:adjust-position="false"
			@input="onInput"
			@focus="onFocus"
			@blur="onBlur"
			:selection-start="cursorPos"
			:selection-end="cursorPos"
			:id="textareaId"
		/>
	</view>
</template>

<script>
    import GraphemeSplitter from 'grapheme-splitter';

	export default {
		props: {
			placeholder: {
				type: String,
				default: "",
			},
			value: {
				type: String,
				default: "",
			},
			maxlength: {
				type: Number,
				default: -1,
			}
		},
		data() {
			return {
				textValue: "",
				cursorPos: -1, // 光标位置
				textareaId: "simple_editor_" + Date.now(), // 唯一ID
			};
		},
		watch: {
			value: {
				handler(newVal) {
					if (newVal !== this.textValue) {
						this.textValue = newVal;
					}
				},
				immediate: true
			}
		},
		methods: {
			onInput(e) {
				this.textValue = e.detail.value;
				// 更新光标位置
				this.cursorPos = e.detail.cursor || this.textValue.length;
				this.$emit("input", {
					detail: {
						value: this.textValue,
						text: this.textValue,
						html: this.textValue // 简单编辑器，HTML 就是文本
					}
				});
			},
			onFocus(e) {
				this.$emit("focus", e);
			},
			onBlur(e) {
				// 保存光标位置
				this.cursorPos = e.detail.cursor || this.textValue.length;
				this.$emit("blur", e);
			},
			// 插入文本（表情或普通文本）
			insertText(text, successFn, errFn) {
				try {
					// 获取当前光标位置（从 textarea 获取）
					this.getCursorPosition((currentPos) => {
						// 在光标位置插入文本
						const beforeText = this.textValue.substring(0, currentPos);
						const afterText = this.textValue.substring(currentPos);
						const newText = beforeText + text + afterText;
						
						// 更新文本值
						this.textValue = newText;
						
						// 更新光标位置（插入文本后）
						const newCursorPos = currentPos + text.length;
						this.cursorPos = newCursorPos;
						
						// 触发 input 事件
						this.$emit("input", {
							detail: {
								value: newText,
								text: newText,
								html: newText
							}
						});
						
						// 使用 $nextTick 确保 DOM 更新后再设置光标
						this.$nextTick(() => {
							// 设置 textarea 的光标位置
							this.setCursorPosition(newCursorPos);
							
							if (successFn) {
								successFn.call(this, [{ success: true }]);
							}
						});
					});
				} catch (err) {
					console.error("插入文本失败", err);
					if (errFn) {
						errFn.call(this, [err]);
					}
				}
			},
			// 获取光标位置
			getCursorPosition(callback) {
				// 尝试通过查询获取光标位置
				// 如果无法获取，使用保存的位置或文本长度
				const pos = this.cursorPos >= 0 ? this.cursorPos : this.textValue.length;
				if (callback) {
					callback(pos);
				}
				return pos;
			},
			// 设置光标位置
			setCursorPosition(pos) {
				this.cursorPos = pos;
				// 尝试通过选择范围来设置光标
				// 注意：uni-app 的 textarea 可能不支持动态设置 selection-start/end
				// 所以这里主要是更新内部状态
			},
			// 清空内容
			clear() {
				this.textValue = "";
				this.cursorPos = 0;
				this.$emit("input", {
					detail: {
						value: "",
						text: "",
						html: ""
					}
				});
			},
			// 删除（退格）
			delete() {
                if (this.textValue.length === 0) return;
                
                const currentPos = this.cursorPos >= 0 ? this.cursorPos : this.textValue.length;
                if (currentPos <= 0) return;
                
                const splitter = new GraphemeSplitter();
                const graphemes = splitter.splitGraphemes(this.textValue);
                
                let currentIndex = 0;
                let graphemeIndex = 0;
                
                // 找到光标位置对应的字素簇
                for (; graphemeIndex < graphemes.length; graphemeIndex++) {
                    currentIndex += graphemes[graphemeIndex].length;
                    if (currentIndex >= currentPos) break;
                }
                
                if (graphemeIndex > 0) {
                    // 计算被删除的字符长度
                    const deletedLength = graphemes[graphemeIndex - 1].length;
                    
                    // 删除字素簇
                    graphemes.splice(graphemeIndex - 1, 1);
                    
                    // 更新文本
                    this.textValue = graphemes.join('');
                    
                    // 更新光标位置
                    this.cursorPos = currentPos - deletedLength;
                    
                    // 触发 input 事件
                    this.$emit("input", {
                        detail: {
                            value: this.textValue,
                            text: this.textValue,
                            html: this.textValue
                        }
                    });
                    
                    // 使用 $nextTick 确保 DOM 更新后再设置光标
                    this.$nextTick(() => {
                        this.setCursorPosition(this.cursorPos);
                    });
                }
            },
			// 获取纯文本内容
			getText() {
				return this.textValue;
			},
			// 获取内容（兼容 editor 组件的接口）
			getContents(successFn) {
				if (successFn) {
					successFn({
						text: this.textValue,
						html: this.textValue,
						delta: null
					});
				}
			}
		},
	};
</script>

<style lang="scss" scoped>
	.simple_editor_wrap {
		position: relative;
		width: 100%;
	}

	.simple_editor_textarea {
		width: 100%;
		min-height: 30px;
		max-height: 120px;
		background-color: #fff;
		font-size: 14px;
		line-height: 1.5;
		padding: 4px;
		word-break: break-all;
		box-sizing: border-box;
	}
</style>