sanbuphy
ad95658a11
- Add NavGrid.vue and NavCard.vue components for better navigation layout - Restructure stage-0 index pages across languages into intro.md with new navigation components - Remove old stage-0 index.md files and update stage-3 pages similarly - Add new dependencies 'claude' and 'codex' to package.json - Improve code formatting in multiple Vue components for better readability - Update documentation content and structure for better user experience
704 lines
14 KiB
Vue
704 lines
14 KiB
Vue
<!--
|
||
EventHandlingDemo.vue
|
||
Canvas 事件处理演示组件
|
||
|
||
用途：
|
||
展示 Canvas 中的鼠标、键盘事件处理，包括点击、拖拽、悬停等交互
|
||
|
||
交互功能：
|
||
- 鼠标点击：在点击位置创建对象
|
||
- 拖拽：拖动对象移动
|
||
- 悬停：高亮显示鼠标下的对象
|
||
- 键盘控制：使用键盘控制对象
|
||
-->
|
||
<template>
|
||
<div class="event-demo">
|
||
<div class="control-panel">
|
||
<div class="mode-selector">
|
||
<label>Interaction Mode / 交互模式</label>
|
||
<div class="button-group">
|
||
<button
|
||
v-for="mode in modes"
|
||
:key="mode.value"
|
||
:class="{ active: currentMode === mode.value }"
|
||
@click="currentMode = mode.value"
|
||
>
|
||
{{ mode.label }}
|
||
</button>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="instructions">
|
||
<h4>Instructions / 操作说明</h4>
|
||
<ul>
|
||
<li v-if="currentMode === 'click'">
|
||
<strong>Click Mode：</strong>点击画布创建圆形，按住 Shift
|
||
可创建不同颜色
|
||
</li>
|
||
<li v-if="currentMode === 'drag'">
|
||
<strong>Drag Mode：</strong>拖拽圆形移动位置，拖拽时会改变颜色
|
||
</li>
|
||
<li v-if="currentMode === 'hover'">
|
||
<strong>Hover Mode：</strong>鼠标悬停在圆形上会高亮显示并显示坐标
|
||
</li>
|
||
<li v-if="currentMode === 'keyboard'">
|
||
<strong>Keyboard Mode：</strong>使用方向键移动选中的圆形，Delete
|
||
键删除
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
|
||
<div class="event-log">
|
||
<h4>Event Log / 事件日志</h4>
|
||
<div class="log-container">
|
||
<div
|
||
v-for="(log, index) in eventLogs"
|
||
:key="index"
|
||
class="log-entry"
|
||
:class="log.type"
|
||
>
|
||
<span class="log-time">{{ log.time }}</span>
|
||
<span class="log-message">{{ log.message }}</span>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<button class="clear-btn" @click="clearAll">
|
||
<span class="icon">🗑️</span>
|
||
Clear All / 清除全部
|
||
</button>
|
||
</div>
|
||
|
||
<div class="canvas-container">
|
||
<canvas
|
||
ref="canvasRef"
|
||
width="600"
|
||
height="400"
|
||
@click="handleClick"
|
||
@mousemove="handleMouseMove"
|
||
@mousedown="handleMouseDown"
|
||
@mouseup="handleMouseUp"
|
||
@mouseleave="handleMouseLeave"
|
||
tabindex="0"
|
||
@keydown="handleKeyDown"
|
||
></canvas>
|
||
</div>
|
||
|
||
<div class="code-display">
|
||
<h4>Event Handling Code / 事件处理代码</h4>
|
||
<pre><code>{{ currentCode }}</code></pre>
|
||
</div>
|
||
|
||
<div class="explanation">
|
||
<h4>Event Handling Tips / 事件处理要点</h4>
|
||
<ul>
|
||
<li>
|
||
<strong>坐标转换：</strong>
|
||
使用 getBoundingClientRect() 获取 Canvas 在页面中的位置，计算相对坐标
|
||
</li>
|
||
<li>
|
||
<strong>碰撞检测：</strong>
|
||
对于圆形，计算鼠标位置到圆心的距离；对于矩形，判断点是否在范围内
|
||
</li>
|
||
<li>
|
||
<strong>事件委托：</strong>
|
||
Canvas 只有一个元素，需要手动判断事件发生在哪个对象上
|
||
</li>
|
||
<li>
|
||
<strong>性能优化：</strong>
|
||
使用 requestAnimationFrame 优化重绘，避免频繁操作
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</template>
|
||
|
||
<script setup>
|
||
import { ref, computed, onMounted, onUnmounted } from 'vue'
|
||
|
||
const canvasRef = ref(null)
|
||
const currentMode = ref('click')
|
||
const circles = ref([])
|
||
const selectedCircle = ref(null)
|
||
const hoveredCircle = ref(null)
|
||
const isDragging = ref(false)
|
||
const eventLogs = ref([])
|
||
|
||
const modes = [
|
||
{ value: 'click', label: 'Click / 点击' },
|
||
{ value: 'drag', label: 'Drag / 拖拽' },
|
||
{ value: 'hover', label: 'Hover / 悬停' },
|
||
{ value: 'keyboard', label: 'Keyboard / 键盘' }
|
||
]
|
||
|
||
const colors = [
|
||
'#e74c3c',
|
||
'#3498db',
|
||
'#2ecc71',
|
||
'#f39c12',
|
||
'#9b59b6',
|
||
'#1abc9c'
|
||
]
|
||
|
||
const currentCode = computed(() => {
|
||
const templates = {
|
||
click: `// 点击创建圆形
|
||
canvas.addEventListener('click', (e) => {
|
||
const rect = canvas.getBoundingClientRect()
|
||
const x = e.clientX - rect.left
|
||
const y = e.clientY - rect.top
|
||
|
||
const circle = {
|
||
x: x,
|
||
y: y,
|
||
radius: 30,
|
||
color: '#3498db'
|
||
}
|
||
|
||
circles.push(circle)
|
||
draw()
|
||
})`,
|
||
|
||
drag: `// 拖拽移动圆形
|
||
let isDragging = false
|
||
let selectedCircle = null
|
||
|
||
canvas.addEventListener('mousedown', (e) => {
|
||
const { x, y } = getMousePos(e)
|
||
|
||
// 检测点击了哪个圆形
|
||
circles.forEach(circle => {
|
||
const dist = Math.sqrt((x - circle.x) ** 2 + (y - circle.y) ** 2)
|
||
if (dist < circle.radius) {
|
||
isDragging = true
|
||
selectedCircle = circle
|
||
}
|
||
})
|
||
})
|
||
|
||
canvas.addEventListener('mousemove', (e) => {
|
||
if (isDragging && selectedCircle) {
|
||
const { x, y } = getMousePos(e)
|
||
selectedCircle.x = x
|
||
selectedCircle.y = y
|
||
draw()
|
||
}
|
||
})
|
||
|
||
canvas.addEventListener('mouseup', () => {
|
||
isDragging = false
|
||
selectedCircle = null
|
||
})`,
|
||
|
||
hover: `// 悬停高亮
|
||
canvas.addEventListener('mousemove', (e) => {
|
||
const { x, y } = getMousePos(e)
|
||
let hovered = null
|
||
|
||
// 检测悬停
|
||
circles.forEach(circle => {
|
||
const dist = Math.sqrt((x - circle.x) ** 2 + (y - circle.y) ** 2)
|
||
if (dist < circle.radius) {
|
||
hovered = circle
|
||
}
|
||
})
|
||
|
||
if (hovered) {
|
||
canvas.style.cursor = 'pointer'
|
||
// 绘制高亮效果
|
||
ctx.strokeStyle = '#e74c3c'
|
||
ctx.lineWidth = 3
|
||
ctx.beginPath()
|
||
ctx.arc(hovered.x, hovered.y, hovered.radius + 5, 0, Math.PI * 2)
|
||
ctx.stroke()
|
||
} else {
|
||
canvas.style.cursor = 'default'
|
||
}
|
||
|
||
draw()
|
||
})`,
|
||
|
||
keyboard: `// 键盘控制
|
||
canvas.tabIndex = 0 // 使 canvas 可以获取焦点
|
||
canvas.focus()
|
||
|
||
canvas.addEventListener('keydown', (e) => {
|
||
const step = 10
|
||
|
||
switch(e.key) {
|
||
case 'ArrowUp':
|
||
selectedCircle.y -= step
|
||
break
|
||
case 'ArrowDown':
|
||
selectedCircle.y += step
|
||
break
|
||
case 'ArrowLeft':
|
||
selectedCircle.x -= step
|
||
break
|
||
case 'ArrowRight':
|
||
selectedCircle.x += step
|
||
break
|
||
case 'Delete':
|
||
circles = circles.filter(c => c !== selectedCircle)
|
||
selectedCircle = null
|
||
break
|
||
}
|
||
|
||
draw()
|
||
})`
|
||
}
|
||
|
||
return templates[currentMode.value]
|
||
})
|
||
|
||
const addLog = (message, type = 'info') => {
|
||
const now = new Date()
|
||
const time = `${now.getHours().toString().padStart(2, '0')}:${now.getMinutes().toString().padStart(2, '0')}:${now.getSeconds().toString().padStart(2, '0')}`
|
||
|
||
eventLogs.value.unshift({ time, message, type })
|
||
if (eventLogs.value.length > 10) {
|
||
eventLogs.value.pop()
|
||
}
|
||
}
|
||
|
||
const getMousePos = (e) => {
|
||
const canvas = canvasRef.value
|
||
const rect = canvas.getBoundingClientRect()
|
||
return {
|
||
x: e.clientX - rect.left,
|
||
y: e.clientY - rect.top
|
||
}
|
||
}
|
||
|
||
const draw = () => {
|
||
const canvas = canvasRef.value
|
||
if (!canvas) return
|
||
const ctx = canvas.getContext('2d')
|
||
|
||
// 清除画布
|
||
ctx.clearRect(0, 0, canvas.width, canvas.height)
|
||
|
||
// 绘制背景
|
||
ctx.fillStyle = '#fafafa'
|
||
ctx.fillRect(0, 0, canvas.width, canvas.height)
|
||
|
||
// 绘制所有圆形
|
||
circles.value.forEach((circle) => {
|
||
// 填充
|
||
ctx.fillStyle = circle.color
|
||
ctx.beginPath()
|
||
ctx.arc(circle.x, circle.y, circle.radius, 0, Math.PI * 2)
|
||
ctx.fill()
|
||
|
||
// 描边
|
||
ctx.strokeStyle = '#2c3e50'
|
||
ctx.lineWidth = 2
|
||
ctx.stroke()
|
||
|
||
// 高光
|
||
ctx.fillStyle = 'rgba(255, 255, 255, 0.3)'
|
||
ctx.beginPath()
|
||
ctx.arc(
|
||
circle.x - circle.radius * 0.3,
|
||
circle.y - circle.radius * 0.3,
|
||
circle.radius * 0.4,
|
||
0,
|
||
Math.PI * 2
|
||
)
|
||
ctx.fill()
|
||
|
||
// 选中状态
|
||
if (circle === selectedCircle.value) {
|
||
ctx.strokeStyle = '#e74c3c'
|
||
ctx.lineWidth = 3
|
||
ctx.beginPath()
|
||
ctx.arc(circle.x, circle.y, circle.radius + 5, 0, Math.PI * 2)
|
||
ctx.stroke()
|
||
}
|
||
|
||
// 悬停状态
|
||
if (circle === hoveredCircle.value && currentMode.value === 'hover') {
|
||
ctx.fillStyle = 'rgba(231, 76, 60, 0.2)'
|
||
ctx.beginPath()
|
||
ctx.arc(circle.x, circle.y, circle.radius + 10, 0, Math.PI * 2)
|
||
ctx.fill()
|
||
|
||
// 显示坐标
|
||
ctx.fillStyle = '#2c3e50'
|
||
ctx.font = '12px Arial'
|
||
ctx.fillText(
|
||
`(${Math.round(circle.x)}, ${Math.round(circle.y)})`,
|
||
circle.x + circle.radius + 10,
|
||
circle.y
|
||
)
|
||
}
|
||
})
|
||
}
|
||
|
||
const handleClick = (e) => {
|
||
if (currentMode.value !== 'click') return
|
||
|
||
const { x, y } = getMousePos(e)
|
||
const color = e.shiftKey
|
||
? colors[Math.floor(Math.random() * colors.length)]
|
||
: '#3498db'
|
||
|
||
circles.value.push({
|
||
x,
|
||
y,
|
||
radius: 30,
|
||
color
|
||
})
|
||
|
||
addLog(`Created circle at (${Math.round(x)}, ${Math.round(y)})`, 'success')
|
||
draw()
|
||
}
|
||
|
||
const handleMouseMove = (e) => {
|
||
const { x, y } = getMousePos(e)
|
||
|
||
if (
|
||
currentMode.value === 'drag' &&
|
||
isDragging.value &&
|
||
selectedCircle.value
|
||
) {
|
||
selectedCircle.value.x = x
|
||
selectedCircle.value.y = y
|
||
draw()
|
||
return
|
||
}
|
||
|
||
if (currentMode.value === 'hover') {
|
||
let found = null
|
||
circles.value.forEach((circle) => {
|
||
const dist = Math.sqrt((x - circle.x) ** 2 + (y - circle.y) ** 2)
|
||
if (dist < circle.radius) {
|
||
found = circle
|
||
}
|
||
})
|
||
|
||
if (found !== hoveredCircle.value) {
|
||
hoveredCircle.value = found
|
||
if (found) {
|
||
addLog(
|
||
`Hovering circle at (${Math.round(found.x)}, ${Math.round(found.y)})`,
|
||
'info'
|
||
)
|
||
}
|
||
}
|
||
draw()
|
||
}
|
||
}
|
||
|
||
const handleMouseDown = (e) => {
|
||
if (currentMode.value !== 'drag') return
|
||
|
||
const { x, y } = getMousePos(e)
|
||
|
||
circles.value.forEach((circle) => {
|
||
const dist = Math.sqrt((x - circle.x) ** 2 + (y - circle.y) ** 2)
|
||
if (dist < circle.radius) {
|
||
isDragging.value = true
|
||
selectedCircle.value = circle
|
||
addLog(
|
||
`Started dragging circle at (${Math.round(x)}, ${Math.round(y)})`,
|
||
'info'
|
||
)
|
||
}
|
||
})
|
||
}
|
||
|
||
const handleMouseUp = () => {
|
||
if (isDragging.value) {
|
||
addLog(
|
||
`Dropped circle at (${Math.round(selectedCircle.value.x)}, ${Math.round(selectedCircle.value.y)})`,
|
||
'success'
|
||
)
|
||
}
|
||
isDragging.value = false
|
||
selectedCircle.value = null
|
||
}
|
||
|
||
const handleMouseLeave = () => {
|
||
isDragging.value = false
|
||
selectedCircle.value = null
|
||
hoveredCircle.value = null
|
||
draw()
|
||
}
|
||
|
||
const handleKeyDown = (e) => {
|
||
if (currentMode.value !== 'keyboard') return
|
||
|
||
if (!selectedCircle.value && circles.value.length > 0) {
|
||
selectedCircle.value = circles.value[0]
|
||
}
|
||
|
||
if (!selectedCircle.value) return
|
||
|
||
const step = 10
|
||
let moved = false
|
||
|
||
switch (e.key) {
|
||
case 'ArrowUp':
|
||
selectedCircle.value.y -= step
|
||
moved = true
|
||
break
|
||
case 'ArrowDown':
|
||
selectedCircle.value.y += step
|
||
moved = true
|
||
break
|
||
case 'ArrowLeft':
|
||
selectedCircle.value.x -= step
|
||
moved = true
|
||
break
|
||
case 'ArrowRight':
|
||
selectedCircle.value.x += step
|
||
moved = true
|
||
break
|
||
case 'Delete':
|
||
case 'Backspace':
|
||
circles.value = circles.value.filter((c) => c !== selectedCircle.value)
|
||
addLog('Deleted circle', 'warning')
|
||
selectedCircle.value = circles.value[0] || null
|
||
moved = true
|
||
break
|
||
}
|
||
|
||
if (moved) {
|
||
e.preventDefault()
|
||
draw()
|
||
}
|
||
}
|
||
|
||
const clearAll = () => {
|
||
circles.value = []
|
||
selectedCircle.value = null
|
||
hoveredCircle.value = null
|
||
addLog('Cleared all circles', 'warning')
|
||
draw()
|
||
}
|
||
|
||
onMounted(() => {
|
||
// 初始化几个圆形
|
||
circles.value = [
|
||
{ x: 150, y: 200, radius: 30, color: '#e74c3c' },
|
||
{ x: 300, y: 200, radius: 30, color: '#3498db' },
|
||
{ x: 450, y: 200, radius: 30, color: '#2ecc71' }
|
||
]
|
||
draw()
|
||
})
|
||
</script>
|
||
|
||
<style scoped>
|
||
.event-demo {
|
||
border: 1px solid #e0e0e0;
|
||
border-radius: 8px;
|
||
padding: 20px;
|
||
background: #fafafa;
|
||
}
|
||
|
||
.control-panel {
|
||
margin-bottom: 20px;
|
||
}
|
||
|
||
.mode-selector {
|
||
margin-bottom: 15px;
|
||
}
|
||
|
||
.mode-selector label {
|
||
display: block;
|
||
font-weight: 600;
|
||
margin-bottom: 8px;
|
||
color: #2c3e50;
|
||
}
|
||
|
||
.button-group {
|
||
display: flex;
|
||
gap: 8px;
|
||
flex-wrap: wrap;
|
||
}
|
||
|
||
.button-group button {
|
||
padding: 8px 16px;
|
||
border: 2px solid #ddd;
|
||
background: white;
|
||
border-radius: 6px;
|
||
cursor: pointer;
|
||
font-size: 14px;
|
||
transition: all 0.2s;
|
||
}
|
||
|
||
.button-group button:hover {
|
||
border-color: #3498db;
|
||
background: #f0f8ff;
|
||
}
|
||
|
||
.button-group button.active {
|
||
border-color: #3498db;
|
||
background: #3498db;
|
||
color: white;
|
||
}
|
||
|
||
.instructions {
|
||
margin-bottom: 15px;
|
||
padding: 12px;
|
||
background: white;
|
||
border-radius: 6px;
|
||
}
|
||
|
||
.instructions h4 {
|
||
margin: 0 0 8px 0;
|
||
color: #2c3e50;
|
||
font-size: 14px;
|
||
}
|
||
|
||
.instructions ul {
|
||
margin: 0;
|
||
padding-left: 20px;
|
||
}
|
||
|
||
.instructions li {
|
||
margin-bottom: 6px;
|
||
color: #555;
|
||
font-size: 13px;
|
||
}
|
||
|
||
.event-log {
|
||
margin-bottom: 15px;
|
||
}
|
||
|
||
.event-log h4 {
|
||
margin: 0 0 8px 0;
|
||
color: #2c3e50;
|
||
font-size: 14px;
|
||
}
|
||
|
||
.log-container {
|
||
max-height: 150px;
|
||
overflow-y: auto;
|
||
background: white;
|
||
border-radius: 6px;
|
||
padding: 10px;
|
||
}
|
||
|
||
.log-entry {
|
||
display: flex;
|
||
gap: 10px;
|
||
padding: 6px 8px;
|
||
border-bottom: 1px solid #f0f0f0;
|
||
font-size: 12px;
|
||
}
|
||
|
||
.log-entry:last-child {
|
||
border-bottom: none;
|
||
}
|
||
|
||
.log-time {
|
||
color: #95a5a6;
|
||
font-family: 'Courier New', monospace;
|
||
flex-shrink: 0;
|
||
}
|
||
|
||
.log-message {
|
||
color: #2c3e50;
|
||
}
|
||
|
||
.log-entry.info .log-message {
|
||
color: #3498db;
|
||
}
|
||
|
||
.log-entry.success .log-message {
|
||
color: #2ecc71;
|
||
}
|
||
|
||
.log-entry.warning .log-message {
|
||
color: #f39c12;
|
||
}
|
||
|
||
.clear-btn {
|
||
padding: 8px 16px;
|
||
border: none;
|
||
border-radius: 6px;
|
||
background: #e74c3c;
|
||
color: white;
|
||
font-size: 13px;
|
||
font-weight: 600;
|
||
cursor: pointer;
|
||
transition: all 0.2s;
|
||
}
|
||
|
||
.clear-btn:hover {
|
||
background: #c0392b;
|
||
transform: translateY(-1px);
|
||
}
|
||
|
||
.canvas-container {
|
||
display: flex;
|
||
justify-content: center;
|
||
margin: 20px 0;
|
||
padding: 20px;
|
||
background: white;
|
||
border-radius: 8px;
|
||
box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
|
||
}
|
||
|
||
canvas {
|
||
border: 2px solid #ddd;
|
||
border-radius: 4px;
|
||
cursor: crosshair;
|
||
outline: none;
|
||
}
|
||
|
||
canvas:focus {
|
||
border-color: #3498db;
|
||
}
|
||
|
||
.code-display {
|
||
margin-top: 20px;
|
||
padding: 15px;
|
||
background: #2c3e50;
|
||
border-radius: 6px;
|
||
overflow-x: auto;
|
||
}
|
||
|
||
.code-display h4 {
|
||
color: #ecf0f1;
|
||
margin: 0 0 10px 0;
|
||
font-size: 14px;
|
||
}
|
||
|
||
.code-display pre {
|
||
margin: 0;
|
||
}
|
||
|
||
.code-display code {
|
||
color: #ecf0f1;
|
||
font-family: 'Courier New', monospace;
|
||
font-size: 12px;
|
||
line-height: 1.6;
|
||
}
|
||
|
||
.explanation {
|
||
margin: 20px 0;
|
||
padding: 15px;
|
||
background: white;
|
||
border-radius: 6px;
|
||
}
|
||
|
||
.explanation h4 {
|
||
margin: 0 0 10px 0;
|
||
color: #2c3e50;
|
||
}
|
||
|
||
.explanation ul {
|
||
margin: 0;
|
||
padding-left: 20px;
|
||
}
|
||
|
||
.explanation li {
|
||
margin-bottom: 8px;
|
||
color: #555;
|
||
font-size: 14px;
|
||
}
|
||
</style>
|