I wahnt to change button appearance when it was clicked.
<?xml version="1.0" encoding="utf-8"?>
<s:Button xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
creationComplete="init()">
<fx:Script>
<![CDATA[
public var _clicked:Boolean = false;
public function init():void{
addEventListener(MouseEvent.CLICK, changeButtonClickStatus);
}
public function changeButtonClickStatus(event:MouseEvent):void{
var that:TopMenuButton = event.currentTarget as TopMenuButton;
that._clicked = !(that._clicked);
if(that._clicked == true){
//change button appearance
}else{
//change button appearance
}
}
]]>
</fx:Script>
</s:Button>
Is there a method using states? I could then use the skin convention.
Thanks in advance for Your help.
If you are looking for a ToggleButton that you can skin the different states of then it already exists in Flex 4.
Check out the source code for ToggleButtonSkin.mxml to see how to skin the different states.
Have a look on the following example:
Applying styles to different states on a Spark Button control in Flex 4
Related
Is there a way to listen for this? I can easily listen for click which selects a RadioButton, but I can't seem to find a way to listen for when the RadioButton has been deselected.
Any ideas?
Thanks!
Back in the Flex 2 days, the "change" event triggered when a radio button was deselected. However, this little convenience disappeared in Flex 3, for some reason, and I don't believe that we were provided with any sort of replacement event.
Handling your events at the RadioButtonGroup level is all fine and well, except that there are times when you really want to handle the events on the radio button level -- particularly if you were hoping to interact with a data provider entry via an itemRenderer that is drawing the radio button.
Conveniently, I have a little bit of boilerplate code you can use as drop-in replacements for RadioButton and RadioButtonGroup that provide a "unselect" event at the radio button level. Here is the SmartRadioButton, first of all:
<?xml version="1.0" encoding="utf-8"?>
<s:RadioButton xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<fx:Script>
<![CDATA[
import events.SmartRadioButtonEvent;
public function notifyDeselect():void {
dispatchEvent(new SmartRadioButtonEvent('deselect'));
}
]]>
</fx:Script>
<fx:Metadata>
[Event(name="deselect", type="events.SmartRadioButtonEvent")]
</fx:Metadata>
</s:RadioButton>
And here is the SmartRadioButtonGroup:
<?xml version="1.0" encoding="utf-8"?>
<s:RadioButtonGroup xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
change="selectionChanged();"
>
<fx:Script>
<![CDATA[
import spark.components.RadioButton;
import components.SmartRadioButton;
protected var oldSelection:SmartRadioButton = null;
// Notify our old selection that it has been deselected, and update
// the reference to the new selection.
public function selectionChanged():void {
var newSelection:SmartRadioButton = this.selection as SmartRadioButton;
if (oldSelection == newSelection) return;
if (oldSelection != null) {
oldSelection.notifyDeselect();
}
oldSelection = newSelection;
}
// Override some properties to make sure that we update oldSelection correctly,
// in the event of a programmatic selection change.
override public function set selectedValue(value:Object):void {
super.selectedValue = value;
oldSelection = super.selection as SmartRadioButton;
}
override public function set selection(value:RadioButton):void {
super.selection = value;
oldSelection = super.selection as SmartRadioButton;
}
]]>
</fx:Script>
</s:RadioButtonGroup>
The two property overrides are in there to make sure that we correctly update the oldSelection, in the event of a programmatic change to the group's selection.
SmartRadioButtonEvent isn't anything fancy or important. It could probably just be a plain Event, since there isn't a special payload.
I have tested the above code, and it all works, but there are surely edge conditions, and other oddities that should be addressed, if it's used in a larger system.
I have prepared a simplified test case for my question. It will run instantly in your Flash Builder if you put the 2 files below into a project.
I'm trying to display a List of strings and a confirmation checkbox in a popup:
In the real application I dispatch a custom event with the string selected in the list, but in the test code below I just call trace(str);
My problem: if I use click event, then the window closes, even if I click at a scrollbar (the !str check below doesn't help, when an item had been selected in previous use). And if I use change event, then the window doesn't close, when I click on the same item as the last time. And the itemClick event seems not to be present in spark.components.List anymore.
Any suggestions please on how to handle this probably frequent problem?
Writing a custom item renderer and having a click event handler for each item seems to be overkill for this case, because I have strings in the list.
Test.mxml: (please click myBtn few times - to see my problems with click and change)
<?xml version="1.0" encoding="utf-8"?>
<s:Application
xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
minWidth="400" minHeight="300">
<fx:Script>
<![CDATA[
import mx.managers.PopUpManager;
private var _popup:Popup = new Popup();
private function showPopup(event:MouseEvent):void {
PopUpManager.addPopUp(_popup, this, true);
PopUpManager.centerPopUp(_popup);
}
]]>
</fx:Script>
<s:Button id="myBtn" right="5" bottom="5"
label="Open window" click="showPopup(event)" />
</s:Application>
Popup.mxml:
<?xml version="1.0" encoding="utf-8"?>
<s:TitleWindow
xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
width="240" height="240"
creationComplete="init(event)"
close="close()">
<fx:Script>
<![CDATA[
import mx.collections.ArrayList;
import mx.controls.Alert;
import mx.events.FlexEvent;
import mx.events.CloseEvent;
import mx.events.ItemClickEvent;
import mx.managers.PopUpManager;
private var myData:ArrayList = new ArrayList();
private function init(event:FlexEvent):void {
// XXX in the real app data is updated from server
myData.removeAll();
for (var i:uint = 1; i <= 10; i++)
myData.addItem('Item #' + i);
}
public function close(event:TimerEvent=null):void {
PopUpManager.removePopUp(this);
}
private function handleClick(event:MouseEvent):void {
var str:String = myList.selectedItem as String;
if (!str)
return;
if (myBox.selected) {
Alert.show(
'Select ' + str + '?',
null,
mx.controls.Alert.YES | mx.controls.Alert.NO,
null,
handleConfirm,
null,
mx.controls.Alert.NO
);
} else {
sendEvent();
}
}
private function handleConfirm(event:CloseEvent):void {
if (event.detail == mx.controls.Alert.YES)
sendEvent();
}
private function sendEvent():void {
close();
// XXX in the real app dispatchEvent() is called
trace('selected: ' + (myList.selectedItem as String));
}
]]>
</fx:Script>
<s:VGroup paddingLeft="20" paddingTop="20"
paddingRight="20" paddingBottom="20" gap="20"
width="100%" height="100%">
<s:List id="myList" dataProvider="{myData}"
click="handleClick(event)"
width="100%" height="100%" fontSize="24" />
<s:CheckBox id="myBox" label="Confirm" />
</s:VGroup>
</s:TitleWindow>
Also I wonder, why do I get the warning above:
Data binding will not be able to detect assignments to "myData".
The Spark List dispatches an 'IndexChangeEvent.CHANGE'. You can listen for this event to know when the selection in the List has changed.
<s:List id="myList" dataProvider="{myData}"
change="handleIndexChange()"
width="100%" height="100%" fontSize="24" />
That event is only dispatched whenever the selected index actually changes, which means that when you reopen the window a second time an item might still be selected and when you click on that one, no CHANGE event will be fired. To fix this just deselect the selection before you close the window:
public function close():void {
myList.selectedIndex = -1;
PopUpManager.removePopUp(this);
}
Also make sure to dispatch your event with the selected item before you close the window (and deselect it).
As for your question about the binding warning: you get that message because you didn't mark 'myData' to be bindable. To fix this just use the [Bindable] tag:
[Bindable]
private var myData:ArrayList = new ArrayList();
or skip the binding altogether if you don't need it and just assign the dataprovider to the list in ActionScript:
myList.dataProvider = myData;
I'd recommend two solutions if you absolutely wnat to display what item was selected. Otherwise, the solution provided by RIAStar would do the trick.
Listen to rendererAdd and rendererRemove events within your PopUp
As explained here, you can easily access to your list's renderers without interfering with its virtualLayout business.
Use a custom renderer
I know. But as long as you keep your code clean, itemRenderers won't blow up your application's memory. They're made to render huge amount of items without memory leaks.
In your Test.mxml, modify the codes like:
<fx:Script>
<![CDATA[
import mx.managers.PopUpManager;
private var _popup:Popup;
private function showPopup(event:MouseEvent):void {
_popup = new Popup();
PopUpManager.addPopUp(_popup, this, true);
PopUpManager.centerPopUp(_popup);
}
]]>
</fx:Script>
And in your Popup.mxml, I am not sure why you have the TimerEvent in the close function.
Also the trace won't be shown, as you are calling the close() function immediately after the alert's YES button has been clicked..
I have a radio button group within a data grid, whenever I attempt to change the selected radio button the web page crashes. Below is how I put together the radio button in the data grid. Anyone see what could be the cause of the issue?
MXML
<mx:Accordion>
<fx:Declarations>
<s:RadioButtonGroup id="cover"/>
</fx:Declarations>
<fx:Script>
<![CDATA[[
[Bindable] public var arrColl = new ArrayCollection();
arrColl.addItem(new ObjectProxy({name:"Jon Doe", position:1, cover:true, group:cover}));
arrColl.addItem(new ObjectProxy({name:"John Smith", position:2, cover:true, group:cover}));
]]>
</fx:Script>
<fx:Binding source="{dg.dataProvider as ArrayCollection}" destination="{arrColl}"/>
<mx:DataGrid id="dg" dataProvider="{arrColl}" ..>
...
</mx:DataGrid>
Renderer
<?xml version="1.0" encoding="utf-8"?>
<s:MXDataGridItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
focusEnabled="true">
<fx:Script>
<![CDATA[
import mx.events.DynamicEvent;
public function selection(event:MouseEvent):void
{
var selectionEvt:DynamicEvent = new DynamicEvent("selectionEvt", true);
selectionEvt.data = this.data;
dispatchEvent(selectionEvt);
}
]]>
</fx:Script>
<s:RadioButton label="Cover" group="{data.group}" selected="{data.cover}" click="selection(event)"/>
</s:MXDataGridItemRenderer>
Radio Button Selection Event Handler
private function updateDp(event:DynamicEvent):void
{
if (event.type == "selectionEvt")
{
for (var i:int = 0; i < editGrid.dataProvider.length; i++)
{
editGrid.dataProvider.getItemAt(i).cover = false; // Unselect all members of radio button group
}
var index:int = editGrid.dataProvider.getItemIndex(event.data);
editGrid.dataProvider.getItemAt(index).cover = true; // Select target radio button
}
I got the code to work by using the radio button group's change event, rather than a custom/dynamic event within the radio button item renderer. However, I still don't quite understand (if/why) using the dynamic events caused the problem.
I had a similar issue once but can't seem to recall how I resolved as it was quite some time ago.
I'm displaying a list of buttons, some of which might be disabled. I need to show a tooltip on the disabled buttons with an explanation of why it's disabled, but it seems I can't disable the button without disabling the tooltip. Is there a simple way around this?
Wrap the Button in a Group, and apply the toolTip to the group instead.
<s:Group toolTip="My toolTip">
<s:Button enabled="false"/>
</s:Group>
It's a bit ugly, but it works.
One way to do this is to override the enabled getter and setter to do what you want. So in my case, I still wanted most mouse events to fire, just not the click event.
<?xml version="1.0" encoding="utf-8"?>
<s:Button buttonMode="true" click="handleClick(event)" xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:s="library://ns.adobe.com/flex/spark">
<fx:Script>
<![CDATA[
public var data:Object;
private var _enabled:Boolean = true;
public override function get enabled():Boolean
{
return _enabled;
}
public override function set enabled(value:Boolean):void
{
_enabled = value;
invalidateDisplayList();
dispatchEvent(new Event("enabledChanged"));
invalidateSkinState();
}
protected function handleClick(event:MouseEvent):void
{
if (!_enabled)
{
event.stopPropagation();
}
}
]]>
</fx:Script>
</s:Button>
Since mouse events now fire, the tooltips work again.
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
<![CDATA[
import mx.managers.ToolTipManager;
import mx.controls.ToolTip;
private var tooltip:ToolTip;
private var p:Point;
private function whyDisable():void
{
//calculate the button position , so that roll over shows the tooltip
p=new Point();
p=localToGlobal(new Point(btn.x,btn.y));
if(btn.enabled==false)
tooltip = ToolTipManager.createToolTip('Button is disabled',p.x+(btn.width/2),p.y-20,'errorTipAbove') as ToolTip;
else
tooltip=ToolTipManager.createToolTip('Button is enabled',p.x+(btn.width/2),p.y-20,'errorTipAbove') as ToolTip;
}
]]>
</mx:Script>
<mx:VBox height="100%" width="100%" horizontalAlign="center" verticalAlign="middle">
<mx:Button id="btn" label="Show Tooltip" buttonDown="trace('ankur')" autoRepeat="true" enabled="true" rollOver="whyDisable();" rollOut="{ToolTipManager.destroyToolTip(tooltip);}"/>
</mx:VBox>
</mx:Application>
Hi, this application works on the disabled button,I used ToolTipManager to do this,
i hope this works for you
have a gr8 time
Ankur Sharma
The best choice for me was to put a void label around and in front of the element. Then, if necessary, I set the element to disable and the tooltip works in the label. If not, I put sent the label to back. It works pretty well.
if (new MainListsAdmin(this.mainApp).temInvestimentoComAqueleTipo(t)) {
deletarGroupInto.setTooltip(new Tooltip("Há investimentos vinculados a Tipo de Investimento.\nDeleção bloqueada."));
this.deletarButton.setDisable(true);
}else{
deletarGroupInto.toBack();
}
You will need to use the ToolTipManager class to create and destroy the tool tips manually.
This article should give you all the info you need to accomplish this:
http://help.adobe.com/en_US/flex/using/WS2db454920e96a9e51e63e3d11c0bf60d65-7ff6.html
re: spark.components.ButtonBar
In the spark ButtonBar's mouseOver event, how do you determine which of the several buttons the mouse is hovering over? There is, of course, no selected index at this juncture. If it makes a difference, my ButtonBar is not defined in MXML but is instantiated in ActionScript and an ArrayList is assigned to the dataProvider property of my ButtonBar instance.
Thanks for the help.
There's no real easy/built-in way to do this if Flex 4, and I think that's a good thing. Instead, they give you access to the renderers via ElementExistenceEvent.RENDERER_ADD and ElementExistenceEvent.RENDERER_REMOVE, so you can look for all kinds of events on the children. Try this out:
<?xml version="1.0" encoding="utf-8"?>
<s:Application
xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx">
<fx:Script>
<![CDATA[
import mx.core.IVisualElement;
import spark.events.RendererExistenceEvent;
protected function rendererAddHandler(event:RendererExistenceEvent):void
{
var element:IVisualElement = event.renderer;
element.addEventListener(MouseEvent.MOUSE_MOVE, renderer_mouseMoveHandler);
}
protected function rendererRemoveHandler(event:RendererExistenceEvent):void
{
var element:IVisualElement = event.renderer;
element.removeEventListener(MouseEvent.MOUSE_MOVE, renderer_mouseMoveHandler);
}
protected function renderer_mouseMoveHandler(event:MouseEvent):void
{
trace(event.currentTarget.label);
}
]]>
</fx:Script>
<s:ButtonBar id="buttonBar"
rendererAdd="rendererAddHandler(event)"
rendererRemove="rendererRemoveHandler(event)">
<s:dataProvider>
<mx:ArrayList source="[one, two, three, four]"/>
</s:dataProvider>
</s:ButtonBar>
</s:Application>
Hope that helps,
Lance
You can simply use the itemRollOver event of the spark buttonbar.