17: Text, Styles, and Fonts in Java

Encoding EAN-13 Supplement 5 in Java 17: Text, Styles, and Fonts
17: Text, Styles, and Fonts
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Scrolling Text
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Plain TextFields are capable of scrolling their content. If you put more text than ts in the size of the TextField, it acts as a window into the full size of the text. You can always write code to pan the TextField instance behind a mask or use its scrollRect property, but you can also use the built-in scroll properties. The difference is that TextFields scroll one row and column at a time, so you won t have smooth scrolling. The user can scroll selectable and input TextFields by dragging a selection below the visible contents of the TextField or by cursoring out of the visible area. You can also enable scrolling via the mouse wheel by setting the mouseWheelEnabled property to true. You can control the scrolling of a TextField with these properties:
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scrollV The current vertical scroll position measured in lines of text (1-based) from the top. In other words, the index of the topmost visible line. bottomScrollV The line index of the bottommost line visible in the TextField. You can determine how many rows are visible by subtracting scrollV from this. Read-only. scrollH The current horizontal scroll position measured in pixels from the left. In other words, how many pixels left the content is being shifted. maxScrollH, maxScrollV The maximum possible values for scrollH and scrollV.
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Read-only. Because the scrollH and scrollV properties are read-write, you can scroll the TextField by setting these. In Example 17-13, you create a document reader that scrolls automatically as the mouse nears the top or bottom of the stage. A dim progress bar shows how far you are into the document.
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package { import flash.display.Sprite; import flash.events.Event; import flash.net.URLLoader; import flash.net.URLRequest; import flash.text.TextField; import flash.text.TextFormat; public class ch17ex13 extends Sprite { protected var tf:TextField; protected var progressBar:Sprite; public function ch17ex13() { tf = new TextField(); var fmt:TextFormat = new TextFormat("_serif", 24, 0x303030); fmt.leading = 10; fmt.leftMargin = fmt.rightMargin = 10; fmt.indent = 20; tf.defaultTextFormat = fmt;
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Part III: The Display List
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tf.multiline = tf.wordWrap = true; tf.mouseWheelEnabled = true; tf.height = stage.stageHeight; tf.width = stage.stageWidth; tf.text = "Loading..."; addChild(tf); progressBar = new Sprite(); progressBar.graphics.beginFill(0, 0.1); progressBar.graphics.drawRect(0, 0, stage.stageWidth, 60); progressBar.graphics.endFill(); addChildAt(progressBar, 0); var loader:URLLoader = new URLLoader(new URLRequest( "http://actionscriptbible.com/files/alice-ch1.txt")); loader.addEventListener(Event.COMPLETE, onLoadComplete); } protected function onLoadComplete(event:Event):void { tf.text = URLLoader(event.target).data; tf.addEventListener(Event.ENTER_FRAME, scrollTextField); stage.frameRate = 15; } protected function scrollTextField(event:Event):void { var margin:Number = 50; if (stage.mouseY < margin) tf.scrollV--; if (stage.mouseY > stage.stageHeight - margin) tf.scrollV++; progressBar.y = (stage.stageHeight - progressBar.height) * (tf.scrollV / tf.maxScrollV); } } }
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Of course, Flash Player would be no good at displaying type if it weren t able to use decent fonts. In this section you ll learn about the different kinds of fonts, ways to embed fonts, and even load fonts at runtime.
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Device Fonts and Embedded Fonts
Thus far, all the code in this chapter has been using device fonts: fonts installed on the end-user s system. Flash Player actually uses the operating system it s running on to nd and render these fonts, so it has less control over their appearance. You ve been using the three generic font aliases: _sans, _serif, and _typewriter. When you use these three special aliases, Flash Player nds a generic sans-serif, serif, or monospaced device font on the system to use. You can t be sure that text rendered with these aliases will look the same across computers, but you can be sure that it will render.
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17: Text, Styles, and Fonts
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Japanese systems have three more generic aliases: , , and , for gothic (rounded and readable), minchou (Ming-style, more calligraphic), and touhaba (monospaced) fonts.
What I haven t mentioned yet is that, using device fonts, you can render text in any font installed on the user s system. You can even use the Font class (coming right up) to nd out what fonts are available and pick from them at runtime. In Example 17-14, if you can nd Comic Sans or a similar font on your computer, you display it; if not, you act disappointed.