📄 7-test-any-css.html
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<HTML>
<HEAD>
<SCRIPT type="text/javascript" src="vkboard.js"></SCRIPT>
<SCRIPT><!--
// This example shows the (still VERY experimental) way
// of specifying the vkeyboard font size with not only "px",
// but with any CSS length unit, i.e. %, em, ex, pt, pc,
// in, cm and mm.
// Look at the 'keyb_change' call in the very bottom of this
// page to see how it works and try to change it.
var opened = false, vkb = null, text = null, insertionS = 0, insertionE = 0;
var userstr = navigator.userAgent.toLowerCase();
var isgecko = (userstr.indexOf('gecko') != -1) && (userstr.indexOf('applewebkit') == -1);
// This function is the "connector" from arbitrary length
// units to "px" world. Parameters are:
//
// 'obj' - object, in which context we should determine
// the px value from the size given in 'value';
//
// 'value' - string, consisting of the numeric value and
// the length unit designator.
//
function convert_to_px(obj, value)
{
// Inner function - retrieves the (default) font size
// for the given object.
function get_font_size(obj)
{
// Standard way:
if(window.getComputedStyle)
return window.getComputedStyle(obj, "").getPropertyValue("font-size");
// MS IE way:
if(obj.currentStyle)
return obj.currentStyle.fontSize;
return "16px";
}
var unit, valu, last = value.length ? value.substr(value.length - 1, 1) : "";
if(isNaN(last))
{
var def = get_font_size(document.body);
unit = def.substr(def.length - 2, 2), valu = def.substr(0, def.indexOf(unit));
switch(value)
{
case "xx-small": valu -= 3; break;
case "x-small": valu -= 2; break;
case "small": valu -= 1; break;
case "medium": break; // already set
case "large": valu += 1; break;
case "x-large": valu += 2; break;
case "xx-large": valu += 3; break;
default:
if(value.length)
{
unit = (last == "%") ? "%" : value.substr(value.length - 2, 2);
valu = value.substr(0, value.indexOf(unit));
}
}
}
else
return value;
if(unit == "px")
return valu;
// Below we have the main problem with the code. The problem is -
// only MS IE has the facility ('window.screen.logicalXDPI' property)
// to determine current screen DPI, which we need to convert values
// from absolute length units (pt, pc, in, cm, mm) to pixels.
//
// Currently, no other browser has the way to retrieve the DPI,
// so we have to use the "usual" value of 96 DPI (== 1.3333 pixels
// per point), which is quite common for Windows machines.
//
// With browsers other than MS IE, only relative length units
// (em, ex, % or px) can be used safely.
// Pixels per point:
var px_per_pt = window.screen.logicalXDPI ? (window.screen.logicalXDPI / 72.0) : 1.3333;
// 'base_u' - base unit for current hierarchy level;
// 'base_v' - base value for current hierarchy level;
//
var base_u, base_v = 1, obj_ = obj;
do
{
var base = get_font_size(obj_);
if(String(base).length)
{
var tmp = base.substr(base.length - 1, 1);
if(isNaN(tmp))
{
base_u = (tmp == "%") ? "%" : base.substr(base.length - 2, 2);
base_v *= base.substr(0, base.indexOf(base_u));
if(base_u == "%") { base_v /= 100.0; }
else if(base_u == "ex") { base_v /= 2.0; }
else if(base_u == "em") { }
else break;
}
else
{
base_u = "px";
base_v *= base;
break;
}
}
obj_ = obj_.parentNode;
}
while(obj_ != document.documentElement);
if(!base_v) { base_v = 16; base_u = "px"; }
switch(unit)
{
case "%": valu /= 50.0;
case "ex": valu /= 2.0;
case "em": valu *= base_v, unit = base_u;
}
switch(unit)
{
case "mm": valu *= 0.1;
case "cm": valu *= 0.3937007874015748031496062992126;
case "in": valu *= 6
case "pc": valu *= 12;
case "pt": valu *= px_per_pt;
}
return valu;
}
function keyb_change(size)
{
document.getElementById("switch").innerHTML = (opened ? "Show keyboard" : "Hide keyboard");
opened = !opened;
if(opened && !vkb)
{
var obj = document.getElementById("keyboard");
vkb = new VKeyboard("keyboard", // container's id
keyb_callback, // reference to the callback function
true, // create the numpad or not? (this and the following params are optional)
"", // font name ("" == system default)
convert_to_px(obj,size) + "px", // font size in px
"#000", // font color
"#F00", // font color for the dead keys
"#FFF", // keyboard base background color
"#FFF", // keys' background color
"#DDD", // background color of switched/selected item
"#777", // border color
"#CCC", // border/font color of "inactive" key (key with no value/disabled)
"#FFF", // background color of "inactive" key (key with no value/disabled)
"#F77", // border color of the language selector's cell
true, // show key flash on click? (false by default)
"#CC3300", // font color during flash
"#FF9966", // key background color during flash
"#CC3300", // key border color during flash
false, // embed VKeyboard into the page?
true, // use 1-pixel gap between the keys?
0); // index(0-based) of the initial layout
}
else
vkb.Show(opened);
text = document.getElementById("textfield");
text.focus();
if(document.attachEvent)
text.attachEvent("onblur", backFocus);
}
function backFocus()
{
if(opened)
{
var l = text.value.length;
setRange(text, insertionS, insertionE);
text.focus();
}
}
// Advanced callback function:
//
function keyb_callback(ch)
{
var val = text.value;
switch(ch)
{
case "BackSpace":
if(val.length)
{
var span = null;
if(document.selection)
span = document.selection.createRange().duplicate();
if(span && span.text.length > 0)
{
span.text = "";
getCaretPositions(text);
}
else
deleteAtCaret(text);
}
break;
default:
insertAtCaret(text, (ch == "Enter" ? (window.opera ? '\r\n' : '\n') : ch));
}
}
// This function retrieves the position (in chars, relative to
// the start of the text) of the edit cursor (caret), or, if
// text is selected in the TEXTAREA, the start and end positions
// of the selection.
//
function getCaretPositions(ctrl)
{
var CaretPosS = -1, CaretPosE = 0;
// Mozilla way:
if(ctrl.selectionStart || (ctrl.selectionStart == '0'))
{
CaretPosS = ctrl.selectionStart;
CaretPosE = ctrl.selectionEnd;
insertionS = CaretPosS == -1 ? CaretPosE : CaretPosS;
insertionE = CaretPosE;
}
// IE way:
else if(document.selection && ctrl.createTextRange)
{
var start = end = 0;
try
{
start = Math.abs(document.selection.createRange().moveStart("character", -10000000)); // start
if (start > 0)
{
try
{
var endReal = Math.abs(ctrl.createTextRange().moveEnd("character", -10000000));
var r = document.body.createTextRange();
r.moveToElementText(ctrl);
var sTest = Math.abs(r.moveStart("character", -10000000));
var eTest = Math.abs(r.moveEnd("character", -10000000));
if ((ctrl.tagName.toLowerCase() != 'input') && (eTest - endReal == sTest))
start -= sTest;
}
catch(err) {}
}
}
catch (e) {}
try
{
end = Math.abs(document.selection.createRange().moveEnd("character", -10000000)); // end
if(end > 0)
{
try
{
var endReal = Math.abs(ctrl.createTextRange().moveEnd("character", -10000000));
var r = document.body.createTextRange();
r.moveToElementText(ctrl);
var sTest = Math.abs(r.moveStart("character", -10000000));
var eTest = Math.abs(r.moveEnd("character", -10000000));
if ((ctrl.tagName.toLowerCase() != 'input') && (eTest - endReal == sTest))
end -= sTest;
}
catch(err) {}
}
}
catch (e) {}
insertionS = start;
insertionE = end
}
}
function setRange(ctrl, start, end)
{
if(ctrl.setSelectionRange) // Standard way (Mozilla, Opera, ...)
{
ctrl.setSelectionRange(start, end);
}
else // MS IE
{
var range;
try
{
range = ctrl.createTextRange();
}
catch(e)
{
try
{
range = document.body.createTextRange();
range.moveToElementText(ctrl);
}
catch(e)
{
range = null;
}
}
if(!range) return;
range.collapse(true);
range.moveStart("character", start);
range.moveEnd("character", end - start);
range.select();
}
insertionS = start;
insertionE = end;
}
function deleteSelection(ctrl)
{
if(insertionS == insertionE) return;
var tmp = (document.selection && !window.opera) ? ctrl.value.replace(/\r/g,"") : ctrl.value;
ctrl.value = tmp.substring(0, insertionS) + tmp.substring(insertionE, tmp.length);
setRange(ctrl, insertionS, insertionS);
}
function deleteAtCaret(ctrl)
{
// if(insertionE < insertionS) insertionE = insertionS;
if(insertionS != insertionE)
{
deleteSelection(ctrl);
return;
}
if(insertionS == insertionE)
insertionS = insertionS - 1;
var tmp = (document.selection && !window.opera) ? ctrl.value.replace(/\r/g,"") : ctrl.value;
ctrl.value = tmp.substring(0, insertionS) + tmp.substring(insertionE, tmp.length);
setRange(ctrl, insertionS, insertionS);
}
// This function inserts text at the caret position:
//
function insertAtCaret(ctrl, val)
{
if(insertionS != insertionE) deleteSelection(ctrl);
if(isgecko && document.createEvent && !window.opera)
{
var e = document.createEvent("KeyboardEvent");
if(e.initKeyEvent && ctrl.dispatchEvent)
{
e.initKeyEvent("keypress", // in DOMString typeArg,
false, // in boolean canBubbleArg,
true, // in boolean cancelableArg,
null, // in nsIDOMAbstractView viewArg, specifies UIEvent.view. This value may be null;
false, // in boolean ctrlKeyArg,
false, // in boolean altKeyArg,
false, // in boolean shiftKeyArg,
false, // in boolean metaKeyArg,
null, // key code;
val.charCodeAt(0));// char code.
ctrl.dispatchEvent(e);
}
}
else
{
var tmp = (document.selection && !window.opera) ? ctrl.value.replace(/\r/g,"") : ctrl.value;
ctrl.value = tmp.substring(0, insertionS) + val + tmp.substring(insertionS, tmp.length);
}
setRange(ctrl, insertionS + val.length, insertionS + val.length);
}
//--></SCRIPT></HEAD>
<BODY>
<P style="font-family:Tahoma;font-size:14px">Virtual keyboard test #7: specifying keyboard size with any CSS length unit.</P>
<TABLE border="0" width="60%">
<TR>
<TD width="100px"><TEXTAREA id="textfield" rows="12" cols="50" onkeyup="getCaretPositions(this);" onclick="getCaretPositions(this);"></TEXTAREA></TD>
<TD width="10px"></TD><TD><DIV width="50px" align="justify">VKeyboard font size is set to '1em'. View page source to see how it works.</DIV></TD>
</TR>
</TABLE>
<!-- VKeyboard font size is set to 1em. Change to see the effect. -->
<P><A href="javascript:keyb_change('1em')" onclick="javascript:blur()" id="switch" style="font-family:Tahoma;font-size:14px;text-decoration:none;border-bottom: 1px dashed #0000F0;color:#0000F0">Show keyboard</A></P>
<DIV id="keyboard"></DIV>
</BODY></HTML>⌨️ 快捷键说明
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