带有 TileList 和自定义渲染器的 PopUpButton
我为 PopUpButton 准备了一个简单的测试用例,用于打开带有黑色和红色条目的 TileList,它大部分工作正常,但有 2 个烦恼。
我搜索了很多,尝试了几种变体(在渲染器中添加了 [Bindable] 成员;向 bids 数组添加了颜色成员;创建了我的 public override set data() 方法;...)也得到了一些答案,但它们太笼统了。
如果有人可以建议代码来解决我的代码中的两个问题,我将不胜感激:
1)从右向左滚动“tl2”效果不佳:条目以红色和黑色的混合显示。我知道 TileList 重用了 itemRenderer,但是如何解决这个问题呢?
2)在调试模式下我收到许多警告: 警告:无法绑定到类“Object”上的属性“label”(类不是 IEventDispatcher)
谢谢, Alex
MyRenderer.mxml:
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml"
verticalScrollPolicy="off" horizontalScrollPolicy="off"
width="100%" height="100%">
<mx:Script>
<![CDATA[
public static function findColor(str:String):uint {
return (str.indexOf('♥') != -1 ||
str.indexOf('♦') != -1) ? 0xFF0000 : 0x000000;
}
]]>
</mx:Script>
<mx:Label truncateToFit="true" width="60"
text="{data.label}" color="{findColor(data.label)}"/>
</mx:Canvas>
MyTest.mxml:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
creationPolicy="all" applicationComplete="init(event);">
<mx:Style>
@font-face {
src:url("C:\\WINDOWS\\Fonts\\arial.ttf");
fontFamily: myFont;
unicodeRange:
U+0020-U+0040, /* Punctuation, Numbers */
U+0041-U+005A, /* Upper-Case A-Z */
U+005B-U+0060, /* Punctuation and Symbols */
U+0061-U+007A, /* Lower-Case a-z */
U+007B-U+007E, /* Punctuation and Symbols */
U+0410-U+0451, /* cyrillic */
U+2660-U+266B; /* card suits */
}
List, CheckBox, Label, Button, PopUpButton, TileList {
fontFamily: myFont;
fontSize: 24;
}
</mx:Style>
<mx:Script>
<![CDATA[
import mx.controls.*;
import mx.events.*;
[Bindable]
private var bids:Array;
private var tl:TileList;
private function init(event:FlexEvent):void {
bids = createBids();
pub.popUp = createList(bids);
}
private function createBids():Array {
var arr:Array = [{label: 'Pass'}];
for (var i:uint = 6; i <= 10; i++)
for (var j:uint = 0; j < 5; j++)
arr.unshift({label: i+'♠♣♦♥ '.charAt(j%5)});
return arr;
}
private function createList(arr:Array):TileList {
tl = new TileList();
tl.maxColumns = 5;
tl.width = 350;
tl.height = 250;
tl.dataProvider = arr;
tl.itemRenderer = new ClassFactory(MyRenderer);
tl.addEventListener('itemClick', itemClickHandler);
if (arr.length > 0) {
tl.selectedIndex = arr.length - 1;
pub.label = arr[tl.selectedIndex].label;
}
return tl;
}
private function itemClickHandler(event:ListEvent):void {
var index:uint = tl.columnCount * event.rowIndex + event.columnIndex;
var label:String = bids[index].label;
pub.label = label;
pub.setStyle('color', MyRenderer.findColor(label));
pub.close();
tl.selectedIndex = index;
}
]]>
</mx:Script>
<mx:Panel title="TileList scrolling problem" height="100%" width="100%"
paddingTop="10" paddingBottom="10" paddingLeft="10" paddingRight="10">
<mx:Label width="100%" color="blue" text="Select your bid:"/>
<mx:TileList id="tl2" height="200" width="200"
maxColumns="5" rowHeight="30" columnWidth="60"
dataProvider="{bids}" itemRenderer="MyRenderer"/>
</mx:Panel>
<mx:ApplicationControlBar width="100%">
<mx:Spacer width="100%"/>
<mx:CheckBox id="auto" label="Auto:"/>
<mx:Button id="left" label="<<"/>
<mx:PopUpButton id="pub" width="90"/>
<mx:Button id="right" label=">>"/>
</mx:ApplicationControlBar>
</mx:Application>
更新:
谢谢 Wade,警告现在消失了(我想在我的中使用 {data.label} 是不行的标签),但“tl2”仍然存在滚动问题。
新的 MyRenderer.mxml (仍然存在滚动问题):
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml"
verticalScrollPolicy="off" horizontalScrollPolicy="off"
width="100%" height="100%">
<mx:Script>
<![CDATA[
override public function set data(value:Object):void {
super.data = value;
var str:String = String(value.label);
myLabel.text = str;
myLabel.setStyle('color', findColor(str));
}
public static function findColor(str:String):uint {
return (str.indexOf('♥') != -1 ||
str.indexOf('♦') != -1) ? 0xFF0000 : 0x000000;
}
]]>
</mx:Script>
<mx:Label id="myLabel" truncateToFit="true" width="60"/>
</mx:Canvas>
I have prepared a simple test case for a PopUpButton opening a TileList with black and red entries and it mostly works, but has 2 annoyances.
I've searched a lot, tried several variants (added [Bindable] members in my renderer; added color member to the bids array; created my public override set data() method; ...) and has been getting some answers too, but they are way too general.
I would appreciate if someone can suggest code to fix the 2 issues in my code:
1) Scrolling "tl2" right-left doesn't work well: the entries are displayed in a mix of red and black. I know the TileList reuses itemRenderer, but how do I fix the problem?
2) In debug-mode I get numerous warnings:
warning: unable to bind to property 'label' on class 'Object' (class is not an IEventDispatcher)
Thank you,
Alex
MyRenderer.mxml:
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml"
verticalScrollPolicy="off" horizontalScrollPolicy="off"
width="100%" height="100%">
<mx:Script>
<![CDATA[
public static function findColor(str:String):uint {
return (str.indexOf('♥') != -1 ||
str.indexOf('♦') != -1) ? 0xFF0000 : 0x000000;
}
]]>
</mx:Script>
<mx:Label truncateToFit="true" width="60"
text="{data.label}" color="{findColor(data.label)}"/>
</mx:Canvas>
MyTest.mxml:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
creationPolicy="all" applicationComplete="init(event);">
<mx:Style>
@font-face {
src:url("C:\\WINDOWS\\Fonts\\arial.ttf");
fontFamily: myFont;
unicodeRange:
U+0020-U+0040, /* Punctuation, Numbers */
U+0041-U+005A, /* Upper-Case A-Z */
U+005B-U+0060, /* Punctuation and Symbols */
U+0061-U+007A, /* Lower-Case a-z */
U+007B-U+007E, /* Punctuation and Symbols */
U+0410-U+0451, /* cyrillic */
U+2660-U+266B; /* card suits */
}
List, CheckBox, Label, Button, PopUpButton, TileList {
fontFamily: myFont;
fontSize: 24;
}
</mx:Style>
<mx:Script>
<![CDATA[
import mx.controls.*;
import mx.events.*;
[Bindable]
private var bids:Array;
private var tl:TileList;
private function init(event:FlexEvent):void {
bids = createBids();
pub.popUp = createList(bids);
}
private function createBids():Array {
var arr:Array = [{label: 'Pass'}];
for (var i:uint = 6; i <= 10; i++)
for (var j:uint = 0; j < 5; j++)
arr.unshift({label: i+'♠♣♦♥ '.charAt(j%5)});
return arr;
}
private function createList(arr:Array):TileList {
tl = new TileList();
tl.maxColumns = 5;
tl.width = 350;
tl.height = 250;
tl.dataProvider = arr;
tl.itemRenderer = new ClassFactory(MyRenderer);
tl.addEventListener('itemClick', itemClickHandler);
if (arr.length > 0) {
tl.selectedIndex = arr.length - 1;
pub.label = arr[tl.selectedIndex].label;
}
return tl;
}
private function itemClickHandler(event:ListEvent):void {
var index:uint = tl.columnCount * event.rowIndex + event.columnIndex;
var label:String = bids[index].label;
pub.label = label;
pub.setStyle('color', MyRenderer.findColor(label));
pub.close();
tl.selectedIndex = index;
}
]]>
</mx:Script>
<mx:Panel title="TileList scrolling problem" height="100%" width="100%"
paddingTop="10" paddingBottom="10" paddingLeft="10" paddingRight="10">
<mx:Label width="100%" color="blue" text="Select your bid:"/>
<mx:TileList id="tl2" height="200" width="200"
maxColumns="5" rowHeight="30" columnWidth="60"
dataProvider="{bids}" itemRenderer="MyRenderer"/>
</mx:Panel>
<mx:ApplicationControlBar width="100%">
<mx:Spacer width="100%"/>
<mx:CheckBox id="auto" label="Auto:"/>
<mx:Button id="left" label="<<"/>
<mx:PopUpButton id="pub" width="90"/>
<mx:Button id="right" label=">>"/>
</mx:ApplicationControlBar>
</mx:Application>
Update:
Thank you Wade, the warning is gone now (I guess it was not ok to use {data.label} in my label), but the "tl2" still has scrolling issues.
New MyRenderer.mxml (still has scrolling issues):
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml"
verticalScrollPolicy="off" horizontalScrollPolicy="off"
width="100%" height="100%">
<mx:Script>
<![CDATA[
override public function set data(value:Object):void {
super.data = value;
var str:String = String(value.label);
myLabel.text = str;
myLabel.setStyle('color', findColor(str));
}
public static function findColor(str:String):uint {
return (str.indexOf('♥') != -1 ||
str.indexOf('♦') != -1) ? 0xFF0000 : 0x000000;
}
]]>
</mx:Script>
<mx:Label id="myLabel" truncateToFit="true" width="60"/>
</mx:Canvas>
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您可以通过覆盖项目渲染器上的 set data 方法来解决这两个问题:
由于渲染器被重复使用,确保它们正确更新的最佳方法是使用 set data 方法,因为它总是在以下情况下被调用:渲染器被重用。这也消除了绑定警告,因为您不再绑定到 data.label。注意:我还没有测试过这段代码,它可能需要一些调整:)希望有帮助。
编辑:您的“tl2”问题看起来是由水平滚动平铺列表引起的,而 TileList 似乎针对垂直滚动进行了优化。由于您的数据集有限且相对较小,因此我会将图块列表设置为全尺寸以显示所有元素(消除项目渲染器重复使用)并将其包装在设置为所需尺寸的画布中,并让画布处理滚动。可能不是您正在寻找的答案,抱歉。
You can take care of both of your issues by overriding the set data method on your item renderer:
Since the renderers are re-used, the best way to ensure they are correctly updated is to use the set data method since it always gets called when a renderer gets re-used. This also gets rid of your binding warning since you are no longer binding to data.label. Note: I haven't tested this code, it may need some tweaking :) Hope that helps.
EDIT: Your "tl2" issue looks like it's caused by horizontally scrolling your tile list, whereas the TileList appears to be optimized for vertical scrolling. Since your data set is finite and relatively small, I would make the tile list full size to show all of the elements (eliminating item renderer re-use) and wrap it in a canvas set to the desired dimensions and let the canvas handle the scrolling. Probably not the answer you are looking for, sorry.