Change font size in the whole app with Ctrl+/-

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Flex CSS UP Google C

http://feedproxy.google.com/~r/flexorg/~3/XfQJ3GkTo-E/change-font-size-whole-app-ctrl

Problem
Browser supports changing page font size with C+/- and Ctrl+scrolling, but Flex applications are not affected by this. People with failing sight can not use such applications.

Solution
Work with StyleManager and set "fontSize" at runtime.

Detailed explanation
There is a simple way to change font size in the Flex application. This works through styles without any serious restrictions (+ view source). For CSS classes that use greater or smaller font size "fontSizeDelta" style should be specified with the delta for example 2 or -1:

<mx:Style>

    .header
    {
        fontSizeDelta: 3;
    }

</mx:Style>
Code that actually changes the font size:

private function applyFontSize(fontSize:Number):void
{
    // Loop through all styles and set
    // new "fontSize" value based
    // on new size and "fontSizeDelta" style
    var selectors:Array = StyleManager.selectors;
    for each (var selector:String in selectors)
    {
        var declaration:CSSStyleDeclaration =
StyleManager.getStyleDeclaration(selector);
        var delta:Number = declaration.getStyle("fontSizeDelta");
        if (delta)
        {
            declaration.setStyle("fontSize", fontSize + delta);
            StyleManager.setStyleDeclaration(selector, declaration,
false);
        }
    }

    // global style is applied to all Flex visual components
    var global:CSSStyleDeclaration =
StyleManager.getStyleDeclaration("global");
    if (!global)
        global = new CSSStyleDeclaration("global");
    global.setStyle("fontSize", fontSize);
    // update styles only on last change
    StyleManager.setStyleDeclaration("global", global, true);
}

private function addedToStageHandler():void
{
    stage.addEventListener(KeyboardEvent.KEY_UP, my_keyUpHandler);
}

private function my_keyUpHandler(event:KeyboardEvent):void
{
    if (event.ctrlKey)
    {
        var keyCode:uint = event.keyCode;
        // Ctrl +/up
        if (keyCode == 107 || keyCode == 187 || keyCode == 38)
            fontSize++;
        // Ctrl -/down
        else if (keyCode == 109 || keyCode == 189 || keyCode == 40)
            fontSize--;
    }
}
In order to make Ctrl+/- rigth after application starts (without clicking on it to give focus), set focus automatically:

<body scroll='no'
onLoad="document.getElementById('${application}').focus();">

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Apache+tomcat集群中文乱码问题解决方法 | flex delete关键词和类成员

2009-10-09 10:06
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