I've created a plnkr to auto-group row-spans the way you would really expect it to work out of the box IMHO.
Anyhow... doing this surfaces an apparent bug... the rowSpan is not consistently applied to the grid.. if you scroll up and down, it sometimes applies, and sometimes does not.
In the screenshot below... you can see 'Aaron Peirsol' is spanning... but if I scroll up and down it might not span on him... not consistent.
Here 'Aaron Peirsol' is no longer spanning all 3 rows -- all I did was scroll up and back down
See this Sample
https://plnkr.co/edit/UxOcCL1SEY4tScn2?open=app%2Fapp.component.ts
Here I've added columndefs for the grouping
{
field: 'athlete',
rowSpan: params => params.data.groupCount,
cellClassRules: {
'cell-span': "data.isFirst && data.groupCount>1",
},
width: 200,
},
{field:'groupCount', width: 20}, /* included for debugging */
{field:'isFirst', width: 20}, /* included for debugging */
And here I'm doing the auto-grouping code:
onGridReady(params: GridReadyEvent) {
this.http
.get<any[]>('https://www.ag-grid.com/example-assets/olympic-winners.json')
.subscribe((data) => {
let groupKey = 'athlete';
let sorted = data.sort((a,b) => (a[groupKey] > b[groupKey]) ? 1 :
((b[groupKey] > a[groupKey]) ? -1 : 0));
let filtered = sorted.filter(x => {
return x[groupKey] < 'Albert' && x[groupKey];
});
var groupBy = function(xs, key) {
return xs.reduce(function(rv, x) {
let keyValue = x[key];
if (rv[keyValue] === undefined)
{
rv[keyValue] = 0;
}
if (keyValue) {
rv[keyValue] ++;
}
return rv;
}, {});
};
let grouped = groupBy(filtered, groupKey);
let prev = '';
for (let i=0; i<filtered.length; i++)
{
let keyValue = filtered[i][groupKey];
filtered[i]['groupCount'] = grouped[keyValue];
if (keyValue == prev)
{
filtered[i]['isFirst'] = false;
}
else
{
filtered[i]['isFirst'] = true;
}
prev = keyValue;
}
this.rowData = filtered});
}
OK, found the issue...
rowSpan function must only return a span count for the first row of the span...
every other row it must return 1
I've updated the plunker
public columnDefs: ColDef[] = [
{
field: 'athlete',
rowSpan: params => params.data.groupRowCount == 1 ? params.data.groupCount: 1, //THIS IS CRUCIAL.. only return count for first row
cellClassRules: {
'cell-span': "data.groupRowCount==1 && data.groupCount>1",
},
width: 200,
},
Problem
How can I modify the scroll target of a scrollView? I am looking for kind of a replacement for the "classic" scrollView delegate method
override func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>)
...where we can modfify the targeted scrollView.contentOffset via targetContentOffset.pointee for instance to create a custom paging behaviour.
Or in other words: I do want to create a paging effect in a (horizontal) scrollView.
What I have tried ie. is something like this:
ScrollView(.horizontal, showsIndicators: true, content: {
HStack(alignment: VerticalAlignment.top, spacing: 0, content: {
card(title: "1")
card(title: "2")
card(title: "3")
card(title: "4")
})
})
// 3.
.content.offset(x: self.dragState.isDragging == true ? self.originalOffset : self.modifiedOffset, y: 0)
// 4.
.animation(self.dragState.isDragging == true ? nil : Animation.spring())
// 5.
.gesture(horizontalDragGest)
Attempt
This is what I tried (besides a custom scrollView approach):
A scrollView has a content area larger then screen space to enable scrolling at all.
I created a DragGesture() to detect if there is a drag going on. In the .onChanged and .onEnded closures I modified my #State values to create a desired scrollTarget.
Conditionally fed in both the original unchanged and the new modified values into the .content.offset(x: y:) modifier - depending on the dragState as a replacement for missing scrollDelegate methods.
Added animation acting conditionally only when drag has ended.
Attached the gesture to the scrollView.
Long story short. It doesn't work.
I hope I got across what my problem is.
Any solutions out there? Looking forward to any input. Thanks!
I have managed to achieve a paging behaviour with a #Binding index. The solution might look dirty, I'll explain my workarounds.
The first thing I got wrong, was to get alignment to .leading instead of the default .center, otherwise the offset works unusual. Then I combined the binding and a local offset state. This kinda goes against the "Single source of truth" principle, but otherwise I had no idea how to handle external index changes and modify my offset.
So, my code is the following
struct SwiftUIPagerView<Content: View & Identifiable>: View {
#Binding var index: Int
#State private var offset: CGFloat = 0
#State private var isGestureActive: Bool = false
// 1
var pages: [Content]
var body: some View {
GeometryReader { geometry in
ScrollView(.horizontal, showsIndicators: false) {
HStack(alignment: .center, spacing: 0) {
ForEach(self.pages) { page in
page
.frame(width: geometry.size.width, height: nil)
}
}
}
// 2
.content.offset(x: self.isGestureActive ? self.offset : -geometry.size.width * CGFloat(self.index))
// 3
.frame(width: geometry.size.width, height: nil, alignment: .leading)
.gesture(DragGesture().onChanged({ value in
// 4
self.isGestureActive = true
// 5
self.offset = value.translation.width + -geometry.size.width * CGFloat(self.index)
}).onEnded({ value in
if -value.predictedEndTranslation.width > geometry.size.width / 2, self.index < self.pages.endIndex - 1 {
self.index += 1
}
if value.predictedEndTranslation.width > geometry.size.width / 2, self.index > 0 {
self.index -= 1
}
// 6
withAnimation { self.offset = -geometry.size.width * CGFloat(self.index) }
// 7
DispatchQueue.main.async { self.isGestureActive = false }
}))
}
}
}
you may just wrap your content, I used it for "Tutorial Views".
this a trick to switch between external and internal state changes
.leading is mandatory if you don't want to translate all offsets to center.
set the state to local state change
calculate the full offset from the gesture delta (*-1) plus the previous index state
at the end set the final index based on the gesture predicted end, while rounding the offset up or down
reset the state to handle external changes to index
I have tested it in the following context
struct WrapperView: View {
#State var index: Int = 0
var body: some View {
VStack {
SwiftUIPagerView(index: $index, pages: (0..<4).map { index in TODOView(extraInfo: "\(index + 1)") })
Picker(selection: self.$index.animation(.easeInOut), label: Text("")) {
ForEach(0..<4) { page in Text("\(page + 1)").tag(page) }
}
.pickerStyle(SegmentedPickerStyle())
.padding()
}
}
}
where TODOView is my custom view that indicates a view to implement.
I hope I get the question right, if not please specify which part should I focus on. Also I welcome any suggestions to remove the isGestureActive state.
#gujci your solution is perfect, for more general usage, make it accept Models and view builder as in (note the I pass the geometry size in the builder) :
struct SwiftUIPagerView<TModel: Identifiable ,TView: View >: View {
#Binding var index: Int
#State private var offset: CGFloat = 0
#State private var isGestureActive: Bool = false
// 1
var pages: [TModel]
var builder : (CGSize, TModel) -> TView
var body: some View {
GeometryReader { geometry in
ScrollView(.horizontal, showsIndicators: false) {
HStack(alignment: .center, spacing: 0) {
ForEach(self.pages) { page in
self.builder(geometry.size, page)
}
}
}
// 2
.content.offset(x: self.isGestureActive ? self.offset : -geometry.size.width * CGFloat(self.index))
// 3
.frame(width: geometry.size.width, height: nil, alignment: .leading)
.gesture(DragGesture().onChanged({ value in
// 4
self.isGestureActive = true
// 5
self.offset = value.translation.width + -geometry.size.width * CGFloat(self.index)
}).onEnded({ value in
if -value.predictedEndTranslation.width > geometry.size.width / 2, self.index < self.pages.endIndex - 1 {
self.index += 1
}
if value.predictedEndTranslation.width > geometry.size.width / 2, self.index > 0 {
self.index -= 1
}
// 6
withAnimation { self.offset = -geometry.size.width * CGFloat(self.index) }
// 7
DispatchQueue.main.async { self.isGestureActive = false }
}))
}
}
}
and can be used as :
struct WrapperView: View {
#State var index: Int = 0
#State var items : [(color:Color,name:String)] = [
(.red,"Red"),
(.green,"Green"),
(.yellow,"Yellow"),
(.blue,"Blue")
]
var body: some View {
VStack(spacing: 0) {
SwiftUIPagerView(index: $index, pages: self.items.identify { $0.name }) { size, item in
TODOView(extraInfo: item.model.name)
.frame(width: size.width, height: size.height)
.background(item.model.color)
}
Picker(selection: self.$index.animation(.easeInOut), label: Text("")) {
ForEach(0..<4) { page in Text("\(page + 1)").tag(page) }
}
.pickerStyle(SegmentedPickerStyle())
}.edgesIgnoringSafeArea(.all)
}
}
with the help of some utilities :
struct MakeIdentifiable<TModel,TID:Hashable> : Identifiable {
var id : TID {
return idetifier(model)
}
let model : TModel
let idetifier : (TModel) -> TID
}
extension Array {
func identify<TID: Hashable>(by: #escaping (Element)->TID) -> [MakeIdentifiable<Element, TID>]
{
return self.map { MakeIdentifiable.init(model: $0, idetifier: by) }
}
}
#gujci, thank you for interesting example. I've played with it and removed the isGestureActive state. Full example may be found in my gist.
struct SwiftUIPagerView<Content: View & Identifiable>: View {
#State private var index: Int = 0
#State private var offset: CGFloat = 0
var pages: [Content]
var body: some View {
GeometryReader { geometry in
ScrollView(.horizontal, showsIndicators: false) {
HStack(alignment: .center, spacing: 0) {
ForEach(self.pages) { page in
page
.frame(width: geometry.size.width, height: nil)
}
}
}
.content.offset(x: self.offset)
.frame(width: geometry.size.width, height: nil, alignment: .leading)
.gesture(DragGesture()
.onChanged({ value in
self.offset = value.translation.width - geometry.size.width * CGFloat(self.index)
})
.onEnded({ value in
if abs(value.predictedEndTranslation.width) >= geometry.size.width / 2 {
var nextIndex: Int = (value.predictedEndTranslation.width < 0) ? 1 : -1
nextIndex += self.index
self.index = nextIndex.keepIndexInRange(min: 0, max: self.pages.endIndex - 1)
}
withAnimation { self.offset = -geometry.size.width * CGFloat(self.index) }
})
)
}
}
}
As far as I know scrolls in swiftUI doesn't support anything potentially useful such as scrollViewDidScroll or scrollViewWillEndDragging yet. I suggest using either classic UIKit views for making very custom behavior and cool SwiftUI views for anything that is easier. I've tried that a lot and it actually works! Have a look at this guide. Hope that helps
Alternative solution would be to integrate UIKit into SwiftUI using UIViewRepresentative which links UIKit components with SwiftUI. For additional leads and resources, see how Apple suggests you interface with UIKit: Interfacing with UIKit. They have a good example that shows to page between images and track selection index.
Edit: Until they (Apple) implement some sort of content offset that effects the scroll instead of the entire view, this is their suggested solution since they knew the initial release of SwiftUI wouldn't encompass all functionality of UIKit.
Details
Xcode 14
Swift 5.6.1
Requirements
I do not want to use integration with UIKit (clean SwiftUI ONLY)
I do not want to scroll to the any "ID", I want to scroll to the point
Solution
import SwiftUI
#available(iOS 14.0, macOS 10.15, tvOS 13.0, watchOS 6.0, *)
struct ExtendedScrollView<Content>: View where Content: View {
private let contentProvider: _AligningContentProvider<Content>
// Main Idea from: https://github.com/edudnyk/SolidScroll/blob/main/Sources/SolidScroll/ScrollView.swift
private var config: _ScrollViewConfig
init(config: _ScrollViewConfig = _ScrollViewConfig(),
#ViewBuilder content: () -> Content) {
contentProvider = _AligningContentProvider(content: content(), horizontal: .center, vertical: .center)
self.config = config
}
init(_ axes: Axis.Set = .vertical,
showsIndicators: Bool = true,
#ViewBuilder content: () -> Content) {
var config = _ScrollViewConfig()
config.showsHorizontalIndicator = axes.contains(.horizontal) && showsIndicators
config.showsVerticalIndicator = axes.contains(.vertical) && showsIndicators
self.init(config: config, content: content)
}
init(config: () -> _ScrollViewConfig,
#ViewBuilder content: () -> Content) {
self.init(config: config(), content: content)
}
var body: some View {
_ScrollView(contentProvider: contentProvider, config: config)
}
}
extension _ContainedScrollViewKey: PreferenceKey {}
// MARK: Track ScrollView Scrolling
struct TrackableExtendedScrollView: ViewModifier {
let onChange: (_ScrollViewProxy?) -> Void
func body(content: Content) -> some View {
content
.onPreferenceChange(_ContainedScrollViewKey.self, perform: onChange)
}
}
extension View {
func onScrollChange(perform: #escaping (_ScrollViewProxy?) -> Void) -> some View {
modifier(TrackableExtendedScrollView(onChange: perform))
}
}
Usage Sample
private var gridItemLayout = (0..<40).map { _ in
GridItem(.fixed(50), spacing: 0, alignment: .leading)
}
// ....
ExtendedScrollView() {
LazyHGrid(rows: gridItemLayout) {
ForEach((0..<numberOfRows*numberOfColumns), id: \.self) { index in
let color = (index/numberOfRows)%2 == 0 ? Color(0x94D2BD) : Color(0xE9D8A6)
Text("\(index)")
.frame(width: 50)
.frame(maxHeight: .infinity)
}
}
}
.onScrollChange { proxy in
// let offset = proxy?.contentOffset.y
}
Full Sample
Implementation details
First column and first row are always on the screen
There are 3 "CollectionView":
first row "CollectionView"
first column "CollectionView"
main content "CollectionView"
All "CollectionView" are synced (if you scroll one "CollectionView", another will also be scrolled)
Do not forget to paste The Solution code here
import SwiftUI
import Combine
struct ContentView: View {
private let columWidth: CGFloat = 50
private var gridItemLayout0 = [GridItem(.fixed(50), spacing: 0, alignment: .leading)]
private var gridItemLayout1 = [GridItem(.fixed(50), spacing: 0, alignment: .leading)]
private var gridItemLayout = (0..<40).map { _ in
GridItem(.fixed(50), spacing: 0, alignment: .leading)
}
#State var text: String = "scrolling not detected"
#State private var scrollViewProxy1: _ScrollViewProxy?
#State private var tableContentScrollViewProxy: _ScrollViewProxy?
#State private var tableHeaderScrollViewProxy: _ScrollViewProxy?
private let numberOfColumns = 50
private let numberOfRows = 40
let headerColor = Color(0xEE9B00)
let firstColumnColor = Color(0x0A9396)
let headerTextColor = Color(.white)
let horizontalSpacing: CGFloat = 6
let verticalSpacing: CGFloat = 0
let firstColumnWidth: CGFloat = 100
let columnWidth: CGFloat = 60
var body: some View {
VStack(spacing: 0) {
Text("First column and row are sticked to the content")
.foregroundColor(.gray)
Text(text)
HStack {
Rectangle()
.frame(width: firstColumnWidth-2)
.foregroundColor(.clear)
buildFirstCollectionViewRow()
}
.frame(height: 50)
HStack(alignment: .firstTextBaseline, spacing: horizontalSpacing) {
buildFirstCollectionViewColumn()
buildCollectionViewContent()
}
}
}
#ViewBuilder
private func buildFirstCollectionViewRow() -> some View {
ExtendedScrollView() {
LazyHGrid(rows: gridItemLayout1, spacing: horizontalSpacing) {
ForEach((0..<numberOfColumns), id: \.self) {
let color = $0%2 == 0 ? Color(0x005F73) : Color(0xCA6702)
Text("Value\($0)")
.frame(width: columnWidth)
.frame(maxHeight: .infinity)
.foregroundColor(headerTextColor)
.background(color)
.font(.system(size: 16, weight: .semibold))
}
}
}
.onScrollChange { proxy in
if tableHeaderScrollViewProxy != proxy { tableHeaderScrollViewProxy = proxy }
guard proxy?.isScrolling ?? false else { return }
if tableHeaderScrollViewProxy?.contentOffset.x != tableContentScrollViewProxy?.contentOffset.x,
let offset = proxy?.contentOffset.x {
tableContentScrollViewProxy?.contentOffset.x = offset
}
text = "scrolling: header"
}
}
}
// MARK: Collection View Elements
extension ContentView {
#ViewBuilder
private func buildFirstCollectionViewColumn() -> some View {
ExtendedScrollView() {
LazyHGrid(rows: gridItemLayout, spacing: horizontalSpacing) {
ForEach((0..<numberOfRows), id: \.self) {
Text("multi line text \($0)")
.foregroundColor(.white)
.lineLimit(2)
.frame(width: firstColumnWidth)
.font(.system(size: 16, weight: .semibold))
.frame(maxHeight: .infinity)
.background(firstColumnColor)
.border(.white)
}
}
}
.frame(width: firstColumnWidth)
.onScrollChange { proxy in
if scrollViewProxy1 != proxy { scrollViewProxy1 = proxy }
guard proxy?.isScrolling ?? false else { return }
if scrollViewProxy1?.contentOffset.y != tableContentScrollViewProxy?.contentOffset.y,
let offset = proxy?.contentOffset.y {
tableContentScrollViewProxy?.contentOffset.y = offset
}
text = "scrolling: 1st column"
}
}
#ViewBuilder
private func buildCollectionViewContent() -> some View {
ExtendedScrollView() {
LazyHGrid(rows: gridItemLayout, spacing: horizontalSpacing) {
ForEach((0..<numberOfRows*numberOfColumns), id: \.self) { index in
let color = (index/numberOfRows)%2 == 0 ? Color(0x94D2BD) : Color(0xE9D8A6)
Text("\(index)")
.frame(width: columnWidth)
.frame(maxHeight: .infinity)
.background(color)
.border(.white)
}
}
}
.onScrollChange { proxy in
if tableContentScrollViewProxy != proxy { tableContentScrollViewProxy = proxy }
guard proxy?.isScrolling ?? false else { return }
if scrollViewProxy1?.contentOffset.y != tableContentScrollViewProxy?.contentOffset.y,
let offset = proxy?.contentOffset.y {
self.scrollViewProxy1?.contentOffset.y = offset
}
if tableHeaderScrollViewProxy?.contentOffset.x != tableContentScrollViewProxy?.contentOffset.x,
let offset = proxy?.contentOffset.x {
self.tableHeaderScrollViewProxy?.contentOffset.x = offset
}
text = "scrolling: content"
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
extension Color {
init(_ hex: UInt, alpha: Double = 1) {
self.init(
.sRGB,
red: Double((hex >> 16) & 0xFF) / 255,
green: Double((hex >> 8) & 0xFF) / 255,
blue: Double(hex & 0xFF) / 255,
opacity: alpha
)
}
}
Full Sample Demo
I'm using vue-2.4 and element-ui 1.4.1.
Situation
I have a basic input which is linked with v-model to a computed property. When blur I check if the value input is greater or lower than min and max and I do what I have to do ... Nothing fancy here.
Problem
The value displayed in the input does not always equal enteredValue
Steps to reproduce
1) Input 60 --> Value displayed is the max so 50 and enteredValue is 50 (which is ok)
2) Click outside
3) Input 80 --> Value displayed is 80 and enteredValue is 50
Questions
How can I fix that so the value displayed is always the same as the enteredValue ?
Here is the minimal code to reproduce what I'm facing JSFIDDLE
<div id="app">
The variable enteredValue is {{enteredValue}}
<el-input v-model="measurementValueDisplay" #blur="formatInput($event)"></el-input>
</div>
var Main = {
data() {
return {
enteredValue: '',
max: 50,
min: 10
}
},
computed: {
measurementValueDisplay: {
get: function () {
return this.enteredValue + ' inchs'
},
set: function (newValue) {
}
},
},
methods: {
formatInput($event) {
let inputValue = $event.currentTarget.value;
if (inputValue > this.max) { this.enteredValue = this.max}
else if (inputValue < this.min) { this.enteredValue = this.min}
else this.enteredValue = inputValue
}
}
}
var Ctor = Vue.extend(Main)
new Ctor().$mount('#app')
Reading this vuejs, will understand what happens
"computed properties are cached based on their dependencies. A computed property will only re-evaluate when some of its dependencies have changed."
Changed some comportament of the code. Made run:
computed() method not works properly for update value in window. But if looks at console the value yes updated.
So, i remove computed (getter and setter), and put into data, without setter and getter( i dont like this in javascript).
var Main = {
data() {
return {
measurementValueDisplay:'fff',
enteredValue: '',
max: 50,
min: 10
}
},
computed: {
/*measurementValueDisplay: {
get: function () {
console.log('Computed was triggered so I assume enteredValue changed',this.enteredValue);
return this.enteredValue + ' inchs'
},
set: function (newValue) {
console.log('setter de qye', this.enteredValue);
}
},*/
},
methods: {
formatInput($event) {
this.enteredValue = 0;
let inputValue = $event.currentTarget.value;
console.log(inputValue);
if (inputValue > this.max) { this.enteredValue = this.max}
else if (inputValue < this.min) { this.enteredValue = this.min}
else this.enteredValue = inputValue
this.measurementValueDisplay = this.enteredValue + ' inchs'
console.log(this.enteredValue, 'oioioioio0');
}
}
}
var Ctor = Vue.extend(Main)
new Ctor().$mount('#app')
Your problem is that the values used in the computed property was not updated with the validation capping at 50 (Was 50, is now updated to 50, no need to recalculate), therefore v-model did not update the input.
I've edited your jsfiddle to use two computed properties:
One with an accessor to validate the entered value, one which returns the value with " inch" appended.
Here is the interesting part:
computed: {
measurementValueDisplay: {
get: function () {
return this.enteredValue
},
set: function (newValue) {
this.enteredValue = 0;
let inputValue = parseInt(newValue);
if(Number.isNaN(inputValue)){this.enteredValue = this.min}
else if (inputValue > this.max) { this.enteredValue = this.max}
else if (inputValue < this.min) { this.enteredValue = this.min}
else this.enteredValue = inputValue
}
},
valueWithInch(){
return this.enteredValue + " inch";
}
},
In case anybody still needs a hack for this one, you can use a value that will always change ( for example a timestamp )
var Main = {
data() {
return {
enteredValue: '',
max: 50,
min: 10,
now: 1 //line added
}
},
computed: {
measurementValueDisplay: {
get: function () {
return (this.now - this.now + 1 ) * this.enteredValue + ' inchs'; //line changed
},
set: function (newValue) {
this.now = Date.now(); //line added
}
},
},
methods: {
formatInput($event) {
let inputValue = $event.currentTarget.value;
if (inputValue > this.max) { this.enteredValue = this.max}
else if (inputValue < this.min) { this.enteredValue = this.min}
else this.enteredValue = inputValue
}
}
}
Is there a way in ExtJS 4 to add a background colour to the cells in the whole table, depending only on the value in the cell and not on the columns?
Add renderer to your column:
renderer: function (val, metadata, record) {
var backgroundColor = null;
if (val) {
if (val == 1) backgroundColor = "green";
if (val == 2) backgroundColor = "red";
}
metadata.style = 'background-color: ' + backgroundColor + ';';
return '';
}
Here is a working example: https://fiddle.sencha.com/fiddle/b73
This works for me...
renderer : function(value, meta) {
if(parseInt(value) > 0) {
meta.style = "background-color:green;";
} else {
meta.style = "background-color:red;";
}
}
Basicly what you want to do is:
Create 1 renderer for all columns:
columns:{
defaults: {
renderer: myrenderer
},
items:[
//your column definitions here...
]
}
The renderer is smth like this:
var myrenderer = function(value, metaData, record, rowIndex, colIndex, store, view) {
if (value >= 0 && value < 25) {
metaData.tdCls += 'x-change-cell-red';
} else if (value >= 25 && value < 50) {
metaData.tdCls += 'x-change-cell-orange';
} else if (value >= 50 && value < 75) {
metaData.tdCls += 'x-change-cell-yellow';
} else if (value >= 75 && value < 100) {
metaData.tdCls += 'x-change-cell-green';
} else if (value === 100){
metaData.tdCls +='x-change-cell-awesome-green';
}else {
metaData.tdCls += 'x-change-cell-violet';
}
return value + '%';
}
Is there any way to catch the event if the value inside dijit.form.NumberSpinner widget gets incremented or decremented?
What I intent to do is whenever value goes below 0 set text inside NumberSpinner widget as "Never" and when user increments it from "Never" it should be again set to 0.
dojo.declare("MySpinner", [Spinner], {
zeroValue: 'Never',
adjust: function(/*Object*/ val, /*Number*/ delta){
arguments[0] = val && val > 0 ? val : 0;
return this.inherited(arguments);
},
_getValueAttr: function() {
var v = this.inherited(arguments);
return (!v || v <= 0) ? 0 : v;
},
format: function(/*Number*/ value, /*dojo.number.__FormatOptions*/ constraints){
var v = this.inherited(arguments);
if (v <= 0 || !v)
return this.zeroValue;
return v;
},
isValid: function(/*Boolean*/ isFocused){
var v = this.get('value');
if (!v) {
return true;
}
return this.inherited(arguments);
}
});
Here's the working example
http://jsfiddle.net/cswing/zDVep/