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mathiasbynens/Slightly optimized version of the ‘Device Scale UI elements in iOS Mobile Safari’ script by 37signals

Forked from sstephenson/gist:439777
Created June 16, 2010 06:54
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  1. mathiasbynens renamed this gist Jun 16, 2010. 1 changed file with 25 additions and 33 deletions.
    58 changes: 25 additions & 33 deletions gistfile1.js → ...in iOS Mobile Safari’ script by 37signals
    View file
    Original file line number Diff line number Diff line change
    @@ -3,6 +3,7 @@
    //
    // http://37signals.com/svn/posts/2407-device-scale-user-interface-elements-in-ios-mobile-safari
    // Copyright (c) 2010 37signals.
    // Slightly optimized by Mathias Bynens <http://mathiasbynens.be/>
    //
    // Permission is hereby granted, free of charge, to any person obtaining a copy
    // of this software and associated documentation files (the "Software"), to deal
    @@ -22,44 +23,35 @@
    // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    // THE SOFTWARE.

    (function() {
    var hasTouchSupport = "createTouch" in document;
    if (!hasTouchSupport) return;
    (function(d, w) {

    var headElement = document.getElementsByTagName("head")[0];
    var styleElement = document.createElement("style");
    if (!('createTouch' in d)) return;

    styleElement.setAttribute("type", "text/css");
    headElement.appendChild(styleElement);
    var headElement = d.head || d.getElementsByTagName('head')[0],
    styleElement = d.createElement('style'),
    stylesheet;

    var stylesheet = styleElement.sheet;
    headElement.appendChild(styleElement);

    window.addEventListener("scroll", updateDeviceScaleStyle, false);
    window.addEventListener("resize", updateDeviceScaleStyle, false);
    window.addEventListener("load", updateDeviceScaleStyle, false);
    updateDeviceScaleStyle();
    stylesheet = styleElement.sheet;

    function updateDeviceScaleStyle() {
    if (stylesheet.rules.length) {
    stylesheet.deleteRule(0);
    }
    w.addEventListener('scroll', updateDeviceScaleStyle, false);
    w.addEventListener('resize', updateDeviceScaleStyle, false);
    w.addEventListener('load', updateDeviceScaleStyle, false);
    updateDeviceScaleStyle();

    stylesheet.insertRule(
    ".device_scale {-webkit-transform:scale(" + getDeviceScale() + ")}", 0
    );
    }
    function updateDeviceScaleStyle() {
    if (stylesheet.rules.length) {
    stylesheet.deleteRule(0);
    };
    stylesheet.insertRule('.device-scale {-webkit-transform:scale(' + getDeviceScale() + ')}', 0);
    };

    // Adapted from code by Mislav Marohnić: http://gist.github.com/355625
    function getDeviceScale() {
    var deviceWidth, landscape = Math.abs(window.orientation) == 90;
    // Adapted from code by Mislav Marohnić: http://gist.github.com/355625
    function getDeviceScale() {
    var landscape = Math.abs(window.orientation) === 90,
    deviceWidth = landscape ? Math.max(480, screen.height) : screen.width; // iPhone OS < 3.2 reports a screen height of 396px
    return w.innerWidth / deviceWidth;
    };

    if (landscape) {
    // iPhone OS < 3.2 reports a screen height of 396px
    deviceWidth = Math.max(480, screen.height);
    } else {
    deviceWidth = screen.width;
    }

    return window.innerWidth / deviceWidth;
    }
    })();
    })(document, window);
  2. @sstephenson sstephenson created this gist Jun 15, 2010.
    65 changes: 65 additions & 0 deletions gistfile1.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,65 @@
    // Provides a device_scale class on iOS devices for scaling user
    // interface elements relative to the current zoom factor.
    //
    // http://37signals.com/svn/posts/2407-device-scale-user-interface-elements-in-ios-mobile-safari
    // Copyright (c) 2010 37signals.
    //
    // Permission is hereby granted, free of charge, to any person obtaining a copy
    // of this software and associated documentation files (the "Software"), to deal
    // in the Software without restriction, including without limitation the rights
    // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    // copies of the Software, and to permit persons to whom the Software is
    // furnished to do so, subject to the following conditions:
    //
    // The above copyright notice and this permission notice shall be included in
    // all copies or substantial portions of the Software.
    //
    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    // THE SOFTWARE.

    (function() {
    var hasTouchSupport = "createTouch" in document;
    if (!hasTouchSupport) return;

    var headElement = document.getElementsByTagName("head")[0];
    var styleElement = document.createElement("style");

    styleElement.setAttribute("type", "text/css");
    headElement.appendChild(styleElement);

    var stylesheet = styleElement.sheet;

    window.addEventListener("scroll", updateDeviceScaleStyle, false);
    window.addEventListener("resize", updateDeviceScaleStyle, false);
    window.addEventListener("load", updateDeviceScaleStyle, false);
    updateDeviceScaleStyle();

    function updateDeviceScaleStyle() {
    if (stylesheet.rules.length) {
    stylesheet.deleteRule(0);
    }

    stylesheet.insertRule(
    ".device_scale {-webkit-transform:scale(" + getDeviceScale() + ")}", 0
    );
    }

    // Adapted from code by Mislav Marohnić: http://gist.github.com/355625
    function getDeviceScale() {
    var deviceWidth, landscape = Math.abs(window.orientation) == 90;

    if (landscape) {
    // iPhone OS < 3.2 reports a screen height of 396px
    deviceWidth = Math.max(480, screen.height);
    } else {
    deviceWidth = screen.width;
    }

    return window.innerWidth / deviceWidth;
    }
    })();