Introduction
Use the render function to create a document flow in the canvas and quickly implement the layout.
If there is a problem in use, check the code in the example, click to view DEMO
- vue component vue-easy-canvas
- Support document flow, refer to web, no need to set x, y, width and height
- Compatible with small programs and web, no third-party dependencies
- Support componentization, global components and local components
- Support events
- High performance, scroll-view supports dirty rectangles and only draws the visible part
- Support operation element, similar to operation dom to modify document flow
Supporting elements
- [x]
view
basic element, similar to div - [x]
text
text supports automatic line wrapping and over omitted functions, currently text is implemented as inline-block - [x] ʻimage
image
srcmode
supports aspectFit and aspectFill, other css features are the same as web support
load` event to monitor image loading and drawing completion - [x]
scroll-view
scroll container, you need to setdirection
in the style to support x, y, xy, and set the specific size. SetrenderOnDemand
to draw only the visible part
Styles
Use numbers where the attribute uses pixels
- [x]
display
block | inline-block | flex, text is inline by default - [x]
width
auto 100% Number This box model uses border-box and cannot be modified - [x]
height
- [x]
flex
flex does not support auto, use width directly for fixed width - [x]
minWidth
maxWidth
minHeight
maxHeight
If the specific width is set, the height will not take effect - [x]
margin
marginLeft
,marginRight
,marginTop
,marginBottom
margin supports array abbreviations such as [10,20] [10,20,10,20] - [x]
paddingLeft
,paddingRight
,paddingTop
,paddingBottom
Same as above - [x]
backgroundColor
- [x]
borderRadius
- [x]
borderWidth
borderTopWidth
... Set the thin border directly to 0.5 - [x]
borderColor
- [x]
lineHeight
font related only valid in text - [x]
color
- [x]
fontSize
- [x]
textAlign
left right center - [x]
textIndent
Number - [x]
verticalAlign
top middle bottom - [x]
justifyContent
flex-start center flex-end flex layout align horizontally - [x] ʻalignItems` flex-start center flex-end flex layout align it vertically
- [x]
maxLine
maximum number of lines, exceeding the automatic ellipsis, only supports use in text - [x]
whiteSpace
normal nowrap controls line breaks, not fonts - [x] ʻoverflow` hidden If rounded corners are added, hidden will be added automatically
- []
flexDirection
- [x]
borderStyle
dash Array See ctx.setLineDash() for details - [x]
shadowBlur
set the shadow will automatically add overflow:hidden; - [x]
shadowColor
- [x]
shadowOffsetX
- [x]
shadowOffsetY
- [x]
position
static
ʻabsolute` - [x] ʻopacity
Number`
Installation
bash
npm install easy-canvas-layout --save
Usage
Basic
` javascript
import easyCanvas from'easy-canvas-layout'
// create a layer bind with ctx
const layer = easyCanvas.createLayer(ctx, {
dpr: 2,
width: 300,
height: 600,
})
// create a node tree
// c(tag,options,children)
const node = easyCanvas.createElement((c) => {
return c('view', {
styles: {backgroundColor:'#000' }, // style
attrs:(), // attributes such as src
on:{} // events such as click load
},
[
c('text',{color:'#fff'},'Hello World')
])
})
// mount
node.mount(layer)
`
Register Component
` javascript
...
function button(c,text){
return c(
'view',
{
styles: {
backgroundColor:'#ff6c79',
borderRadius: 10,
borderColor:'#fff',
display:'inline-block',
margin: 2,
padding:[0,10]
},
},
[
c(
'text',
{
styles: {
lineHeight: 20,
color:'#fff',
textAlign:'center',
fontSize: 11,
},
},
text
),
]
)
}
easyCanvas.component('button',(opt,children,c) => button(c,children))
const node = easyCanvas.createElement((c) => {
return c('view',{},[
c('button',(),'This is a global component')
])
})
...
`
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