I'm using the following code to load an image to the screen:
<s:Scroller xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
width="100%"
height="100%">
<s:VGroup width="100%" horizontalAlign="center" paddingBottom="10" paddingLeft="10" paddingRight="10" paddingTop="10" verticalAlign="top">
<s:Label width="100%" text="Being Active" fontSize="14" fontFamily="Black"/>
<s:Image fillMode="scale" smooth="true" scaleMode="letterbox" verticalCenter="0" horizontalCenter="0" width="100%" source="#Embed('assets/img/q3/q3c1all.png')"/>
....
....
</s:VGroup>
</s:Scroller>
In the attached image, it has three images
1. Builder view
2. final design (what designer expects)
3. rendered output (what users will see)
Because of the scaleMode letterbox, there is lots of space above and below image is blanked. And this breaks out the layer. Can someone suggest how can I make the out put looks like design preview (titled Requirement)
How to scale the image proportionately without distorting (like its done in CSS).
To those who struggle with this issue - the solution is to use which will give you full control over the bitmap. One thing to note is - if you are planning to use interaction / events with the image, wrap it inside a container and add click event to it.
I dont know if this is best solution, but it worked for me :)
Related
I have started learning flex 4 and I got myself thinking about how to change views. So I have a question what do people usually use - states or views (ViewStack). The type of web application I am making, can use both, but what do developers use in big projects or maybe they use non of the mentioned before?
Also I have a question about ViewStack. If I write:
<mx:ViewStack id="views" resizeToContent="true" verticalCenter="0" horizontalCenter="0" >
<s:NavigatorContent id="navOne">
<s:Label text="asdas" x="0" y="0"/>
</s:NavigatorContent>
then I can't change location of its child. Label remains in the center of the screen. If I remove vertical and horizontal center from ViewStack and put them in Label's tags, then label will be in top left corner but not in center. How do I control those locations?
As far as you're using Flex 4 you can prefer states. And there are at least two reasons for that:
Flex 4 states are much more declarative than in Flex 3.
Flex 4 hasn't Spark implementation of ViewStack and it is rather obsolete (necessarity of using NavigatorContent with Spark container is another proof of that fact).
The second part of the question. The problem is your ViewStack hasn't any size. So finally it has size of content (Label size). So verticalCenter and horizontalCenter are just alignment of your ViewStack. To control size and alignment of ViewStack you should care about sizes. Something like:
<mx:ViewStack id="views" resizeToContent="true" verticalCenter="0"
horizontalCenter="0" width="500" height="300" >
<s:NavigatorContent id="navOne" width="100%" height="100%">
<s:Label text="asdas" x="0" y="0"/>
</s:NavigatorContent>
In a Flex Mobile project I have a simple itemRenderer where I'm trying to create an "bubble" texting effect, similar to ichat or iphone (just so you get what im going for). But if the text is longer than the screen it runs off, rather than just going down a line.
If I set Group thats holding the rectangle(to create the bubble effect) and the label to 100% it works and keeps it from exceeding the list containers bounds, BUT the group is always at 100% and looks bad, I'm trying to keep the "bubble" JUST AROUND the text.
Anyway so, at the top of my itemRenderer I tried specifying:
<s:ItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark" width="100%" height="100%">
And here's my layout I figured since msg_container has a width of 100% I was hoping bubble_lable_group would just not exceed that but...it doesnt...it just runs off. I tried setting a max width but that does not allow you to input percents. And just to say it 1 more time. I know if i set bubble_lable_group width to 100% it works, and keeps it from going off the edge, but then the rectangle "bubble" stretches all the way across and just looks bad.
<s:VGroup id="main_container" horizontalAlign="left" paddingBottom="10" paddingTop="10"
verticalAlign="top" width="100%">
<s:VGroup id="name_container" width="100%">
<s:Label id="name_label" fontSize="20" fontWeight="bold" text="Name: " />
</s:VGroup>
<s:VGroup id="msg_container" width="100%" paddingLeft="20">
<s:Group id="bubble_lable_group">
<s:Rect id="the_bubble_shape" width="100%" height="100%" radiusX="15" radiusY="15" >
<s:fill>
<s:LinearGradient rotation="90">
<s:GradientEntry color="{grOne}"/>
<s:GradientEntry color="{grTwo}"/>
</s:LinearGradient>
</s:fill>
</s:Rect>
<s:Label id="msg_txt" width="100%" text="msg text here"
fontSize="18" color="#FFFFFF" paddingTop="15" paddingRight="15" paddingBottom="15" paddingLeft="15"/>
</s:Group>
</s:VGroup>
</s:VGroup>
Any Ideas or tricks I could pull to achieve the effect i'm going for and keep it all inside the parent List container? I'm stumped.
EDIT:
Here's some screenshots to help illustrate the issue:
Well, it looks like you want to set the maxWidth property. Only, you can only set that with pixels, not percents. I am guessing that since you are on mobile, you don't want to be setting absolute pixels. Soooo, what if you did something a bit tricky? Data bind the max width to be the width of the renderer minus the padding of your message container...
<s:Group id="bubble_lable_group" maxWidth="{width - msg_container.paddingLeft}" >
Feels like a hack, but it works for me :)
NOTE: Using the standard ItemRenderer class is quite inefficient in Mobile. It may not be an issue for you, but just be aware of it. See this presentation from 360Flex for more info on that: http://zaa.tv/2011/06/360flex-denver-2011-flex-performance-tips-and-tricks/
I was looking for a different question, but this might be helpful to clipAndEnableScrolling="true"
ive been pondering how to create the same type of resizing that acrobat connect does. i did read the documentation of percentage sizing. and i have implemented it. but its not how i want it to look.
to see an example : https://admin.na3.acrobat.com/_a204547676/flextras/
sorry Jeffrey to use you as an example. :)
just try to resize your window and see it... thats what im looking for .
any hints guys?
Given your code sample; the button is not given a height or width; so Flex sizes it automatically used a fixed width. Give the button a percentage width or height and it should resize appropriately as the screen changes.
<?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" backgroundColor="#FFFFFF">
<s:BorderContainer width="40%" height="70%" y="10" horizontalCenter="0">
<mx:Image height="100%" width="100%" id="img" source="http://upload.wikimedia.org/wikipedia/en/thumb/a/ab/Apple-logo.png/125px-Apple-logo.png" horizontalCenter="0"/>
</s:BorderContainer>
<s:Button y="543" horizontalCenter="0" label="start" width="40%" height="30%"/>
</s:Application>
ok i have tried it. but its not the result i am looking for. if you keep resizing back and forth the acrobat app you can see the entire app resizing compared to the above example.
its not quite the same.
I am using a mx:Resize effect to change the width of an image in Flex (leaving the height to look after itself) but I want the image to remain vertically centered on the page. Whilst I could calculate the aspect ratio of the photo, and work out the new y value to keep it centred, I would have to include a mx:Move effect too, and I am hopful that Flex has a simpler way.
This is for a photo gallery where images are loaded at run-time, and swapped about, so I really would like to avoid recalculating the aspect ratio and vertical position every time the updateComplete event fires. It seems so messy.
I tried putting my image inside a mx:VBox with verticalAlign="middle", thinking that the box would do all the centering for me, but this only seems to happen when the app first starts - i need it to gradually adjust the position during the period where the effect plays (to keep it central even when part-way through).
Here's a stripped-down example (which doesn't work):
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="600" height="600">
<mx:Resize id="fxResize" target="{imgPhotoA}" widthTo="350" duration="500" />
<mx:Button x="10" y="10" label="Resize" click="fxResize.play()" />
<mx:VBox id="boxPhotoA" x="100" y="20" height="500" width="350" verticalAlign="middle" borderStyle="solid" verticalScrollPolicy="off" horizontalScrollPolicy="off">
<mx:Image id="imgPhotoA" width="60" maintainAspectRatio="true" source="http://sstatic.net/so/img/logo.png"/>
</mx:VBox>
</mx:Application>
I am a newcomer to Flex, so apologies if I am doing something daft. Looking at the source of the Adobe example photo gallery hasn't helped me realise a solution - I don't think they use effects, but create their own routine to alter the size and position. The code looks horrid!
You could try creating an event handler for the effectEnd event of the Resize control, something that calls invalidateDisplayList on the VBox, something like:
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="600" height="600">
<mx:Script>
<![CDATA[
private function resizeFinishedHandler(Event:Event) : void {
boxPhotoA.invalidateDisplayList();
}
]]>
</mx:Script>
<mx:Resize id="fxResize" target="{imgPhotoA}" widthTo="350" duration="500"
effectEnd="resizeFinishedHandler(event)" />
<mx:Button x="10" y="10" label="Resize" click="fxResize.play()" />
<mx:VBox id="boxPhotoA" x="100" y="20" height="500" width="350" verticalAlign="middle" borderStyle="solid" verticalScrollPolicy="off" horizontalScrollPolicy="off">
<mx:Image id="imgPhotoA" width="60" maintainAspectRatio="true" source="http://sstatic.net/so/img/logo.png"/>
</mx:VBox>
</mx:Application>
Hope this helps.
Since the boss wanted this ready for tomorrow, I had to give up on the idea of Flex doing the work for me, and calculate the values myself.
Note that I knew that all my JPGs were 120px wide, but the heights could vary. This made horizontal positioning easy, so its only the vertical positioning I will refer to below...
PART ONE
Every time the complete event fired on an image object (i.e. a JPG was loaded into it) I set its position based on its height. Assuming the centreline was a line 300 px down from the top of the screen, I used:
oImage.y = 300 - (oImage.contentHeight / 2)
I avoided the updateComplete event as it seemed to fire off hundreds of times when an effect moved/resized the image. I also avoided the height property (in favour of contentHeight) as I found a strange issue with the image tag whereby I had to set its height to a value (I only wanted to set the width really) in order for the resize effect to actually do anything. I used height="999" and let the image take care of its own aspect ratio.
PART TWO
Just before I called the play() method on my effects, I had to set the yTo value for each move effect, to ensure the image would move to the correct vertical position to take into account it being resized at the same time (e.g. if image shrinks, it needs to be moved down slightly).
For each image, I needed to work out the aspect ratio and then I could calculate what the new height of the image would be after resizing.
private function calculate_yto_value(oImage:Image, iWidthAfterTheEffect:int):int {
var iAspectRatio:Number = oImage.contentHeight / oImage.width
var iHeightAfterTheEffect:Number = iAspectRatio * iWidthAfterTheEffect
return 300 - (iHeightAfterTheEffect / 2)
}
fxMovePhoto.yTo = calculate_yto_value(imgPhotoA, 60)
I'm currently learning Flex, and am having the hardest time getting scroll bars to work. In short, I'm making a giant form for users to fill out, contained within a viewstack component. The user will type up information in one view, and it will be displayed in the other. But right now in the first canvas I have components that run off the screen and flex doesn't automatically add a scroll bar, so I added 'verticalScrollPolicy="on"' to my canvas. Now, while it gives me a scroll bar, it gives me an empty scroll bar. I still cannot move it up or down, meaning components are still trapped off the bottom of my screen. Am I missing something simple?
Edit - I'm using Adobe Flex Builder 3, and the components it lets you drag in. http://img12.imageshack.us/img12/218/problem1f.jpg This is a picture of the problem, and i guess relavent code would be.
<mx:Application xmlns:mx="adobe.com/2006/mxml" layout="absolute" width="830" height="835">
<mx:ViewStack x="10" y="72" id="viewstack1" width="790" height="751" >
<mx:Canvas label="Design Mode" width="100%" height="100%" verticalScrollPolicy="on" horizontalScrollPolicy="on" >
(Components inside)
</mx:Canvas>
I think the problem is in the way the content in your canvas determines it's height.
If I do this:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:ViewStack width="500" height="500">
<mx:Canvas width="100%" height="100%">
<mx:Canvas width="100" height="1000" backgroundColor="#ededed" />
</mx:Canvas>
</mx:ViewStack>
</mx:Application>
I get scrollbars - Canvas has a default horizontalScrollPolicy and verticalScrollPolicy of auto, meaning it'll show the scrollbars as needed. I think, for whatever reason, the outer canvas isn't detecting that the content is taller than it should be.
if it can help some one : some related problem