估计 KDE 用户碰到这个问题的概率比较高。这个问题的起因不明，症状是要删除文件时出现
The trash has reached its maximum size! Cleanup the trash manually.
检查垃圾箱里没有东西，却无法删除文件进垃圾箱。直接删除操作不受影响。
问题的直接原因是 Trash 的 metadata 有误，解决办法是把 $HOME/.local/share/Trash 直接删掉，然后执行一下 Empty Trash 操作（其实是让 Trash 重建 metadata），以后就正常了。
今天又长知识了。
首先，最简单的，更正了长久以来的想当然，php 下 explode(‘,’, ”) != array()，而是得到长度为 1 的数组，key 是数值 0，value 是空字符串。天哪，我有多少个程序是基于 explode(‘,’, ”) == array() 写下去的，这下影响大了，得好好查一查。
其次，发现一个不晓得是 sshfs 的 bug 还是 gedit 的 bug。复制错误的过程是：用 Nautilus 或 Dolphin 打开 sshfs 挂载的目录，右击创建一个新文件。文件创建是成功的，属性是 774，用 gedit 打开它却无法保存，提示是没有写权限；但用 kwrite 编辑保存一切正常；用 gedit 再编辑 kwrite 编辑过的文件又能保存。或者，在右击创建一个新文件后，执行一次 chmod 774 filename，也能用 gedit 编辑保存了。
再次，发现在 IE6 下，用 javascript 增大元素的尺寸（比如 jQuery widget 化，增加 border，增加 padding，等），会增大父元素的尺寸。哪怕父元素已用 css 静态赋以宽度值，宽度也会被改变，这是某些精心布局在标准浏览器下很好看，到了 IE6 就面目全非的一大原因。万恶的 IE6 啊，当然从另一方面，说明精心布局仍不够“精心”。为 IE6 布局好比极限运动，挑战好心情的极限；如果看到下属多花一倍时间 fix for IE6，挑战的也是老板的心理极限。
然后，发现 jQuery gallery 里有两个 themes (Humanity, Vader) 的参数不太正常，多了 tr 参数，不知道怎么多出来的，删了似乎没影响。
最后，如果父元素包含所有的子元素都是 float:left 或 float right 的话，不做特殊操作，父元素是没有高度的。父元素的后续元素用一个 clear:both 就能站到该站的位置，但如要为父元素本身画一个边框就稍有难度。最早我用的办法是在这个元素所有的子元素之后增加一个隐形的<div style=”height:0; clear:both;”></div>，但这个硬生生加进去的元素改变了 DOM 结构，破坏了语义，不够 SEO。在 Magento 里学到了另一个方法 :after { clear:both; }，如 .clearer 的示例，但要为低版本的 IE 专门写 clear after fix。我维护一份自己的 style.css，override Magento 原版的 style.css。我觉得这个任务就很“繁重”，如果再来一份自己的 style-ie.css，override Magento 原版的 style-ie.css，就为 clear after fix？总觉得小题大作。今天发现一个 clear after all floating children 的 neat solution，就是在父元素上设定 style=”overflow:auto; zoom:1″。overflow 让父元素调整到应有的高度，zoom 也是必须的，否则 IE6…，唉！
最后的最后，发现 z-index 值在 IE6 下被重置的简单通用的 fix。这个问题的来源是若干个 position 后的元素，给它们设定 z-index，IE6 下根本不按设定值 layout，而且还摸不到规律。比如下拉菜单，有时被其他东西给压住。fix 是赋予下拉菜单 z-index 时，赋予父元素（整个菜单）更高的 z-index。
今天得到感想都是来自生活中的琐事。
A third party Adwords professional requested a read only access to Magento admin panel, which raised the question to me: how to create a Magento admin panel user with read only privilege?
I am keen to do this job via ACL. Magento ACL role resources start from module to controller to action, I can not differentiate read/write privilege at the root level of role resources. It means it involves a lot of hassle coding up ACL in adminhtml.xml when creating a role with read access to all modules, because I have to code for every action, for example, indexAction is a read role resource, saveAction is a write role resource, editAction can be a write role resource if it actually saves data itself, or be a read role resource if post data are posted to saveAction.
Luckily, in my case, the Adwords professional only requested access to two modules – Catalog and Reports. As for Reports module, I treat the whole module as read only, so I simple check “Reports” node in the role resources tree.
As for Catalog module, the Adwords professional only requested to view product list, so I create several children of “Manage Products” node. The children map to all actions in Mage_Adminhtml_Catalog_ProductController, for example, product list maps to indexAction, product detail maps to editAction, product add and update maps to saveAction. I check indexAction node. I could check editAction (because it is read only process) as well but the Adwords professional did not see its necessity.
The last thing left to do is differentiating privilege by role resources node. It is a very simple change – override Mage_Adminhtml_Catalog_ProductController’s _isAllowed() method from
protected function _isAllowed()
{
return Mage::getSingleton('admin/session')->isAllowed('catalog/products');
}
to
protected function _isAllowed()
{
$action = $this->getRequest()->getRequestedActionName();
return Mage::getSingleton('admin/session')->isAllowed('catalog/products/'.$action);
}
I think there may be another to differentiate read and write role resource using ACL, because when I look at a sample adminhtml.xml file, it says
<acl> <resources> <all> <title>Allow Everything</title> </all> </resources> </acl>
What does it means? Does it imply I can do something like
<acl> <resources> <read> <title>Read only</title> </read> <write> <title>Read and write</title> </write> </resources> </acl>
?
If you are working on jQuery UI site to roll your own theme, you can always load your theme parameters by copying and pasting a long string into address bar, such as:
ThemeRoller
But, when you are working on your own site, using ThemeRoller Dev Tool for FireFox, you can not load the current page’s theme parameters into ThemeRoller easily. I find two workarounds. I must admit the workarounds are not easy either. There must be some easy “click-to-load” method, but I did not figure it out.
My solutions require FireBug.
Solution One.
1. Copy your theme parameters string to clipboard. The string is as you see before:
ffDefault=Lucida+Grande,+Lucida+Sans,+Arial,+sans-serif&fwDefault=bold&fsDefault=1.1em&cornerRadius=5px&bgColorHeader=5c9ccc&bgTextureHeader=12_gloss_wave.png&bgImgOpacityHeader=55&borderColorHeader=4297d7&fcHeader=ffffff&iconColorHeader=d8e7f3&bgColorContent=fcfdfd&bgTextureContent=06_inset_hard.png&bgImgOpacityContent=100&borderColorContent=a6c9e2&fcContent=222222&iconColorContent=469bdd&bgColorDefault=dfeffc&bgTextureDefault=02_glass.png&bgImgOpacityDefault=85&borderColorDefault=c5dbec&fcDefault=2e6e9e&iconColorDefault=6da8d5&bgColorHover=d0e5f5&bgTextureHover=02_glass.png&bgImgOpacityHover=75&borderColorHover=79b7e7&fcHover=1d5987&iconColorHover=217bc0&bgColorActive=f5f8f9&bgTextureActive=06_inset_hard.png&bgImgOpacityActive=100&borderColorActive=79b7e7&fcActive=e17009&iconColorActive=f9bd01&bgColorHighlight=fbec88&bgTextureHighlight=01_flat.png&bgImgOpacityHighlight=55&borderColorHighlight=fad42e&fcHighlight=363636&iconColorHighlight=2e83ff&bgColorError=fef1ec&bgTextureError=02_glass.png&bgImgOpacityError=95&borderColorError=cd0a0a&fcError=cd0a0a&iconColorError=cd0a0a&bgColorOverlay=aaaaaa&bgTextureOverlay=01_flat.png&bgImgOpacityOverlay=0&opacityOverlay=30&bgColorShadow=aaaaaa&bgTextureShadow=01_flat.png&bgImgOpacityShadow=0&opacityShadow=30&thicknessShadow=8px&offsetTopShadow=-8px&offsetLeftShadow=-8px&cornerRadiusShadow=8px
Please do not include “#” or “?” at the beginning, because when you paste, sometimes it requires a hash separator, sometimes a question mark separator. You’d better enter the separator separately at the time it requires.
2. Launch FireFox, Go to the web page to custom a theme for, Launch ThemeRoller, Launch FireBug
3. Find ThemeRoller <iframe> element, which is inside <div id=”inline_themeroller”> element, change <iframe> src by appending a hash and pasting theme parameters string. In another words, change src from
http://jqueryui.com/themeroller/developertool/appinterface.php
to
http://jqueryui.com/themeroller/developertool/appinterface.php#ffDefault=Verdana%2CArial%2Csans-serif&fwDefault=normal&fsDefault=1.1em&cornerRadius=6px&bgColorHeader=138b14&bgTextureHeader=01_flat.png&bgImgOpacityHeader=75&borderColorHeader=138b14&fcHeader=222222&iconColorHeader=222222&bgColorContent=ffffff&bgTextureContent=01_flat.png&bgImgOpacityContent=75&borderColorContent=138b14&fcContent=138b14&iconColorContent=222222&bgColorDefault=138b14&bgTextureDefault=03_highlight_soft.png&bgImgOpacityDefault=7…=02_glass.png&bgImgOpacityHighlight=55&borderColorHighlight=ffffff&fcHighlight=363636&iconColorHighlight=2e83ff&bgColorError=fef1ec&bgTextureError=05_inset_soft.png&bgImgOpacityError=95&borderColorError=cd0a0a&fcError=cd0a0a&iconColorError=cd0a0a&bgColorOverlay=aaaaaa&bgTextureOverlay=01_flat.png&bgImgOpacityOverlay=0&opacityOverlay=30&bgColorShadow=aaaaaa&bgTextureShadow=01_flat.png&bgImgOpacityShadow=0&opacityShadow=30&thicknessShadow=8px&offsetTopShadow=-8px&offsetLeftShadow=-8px&cornerRadiusShadow=8px
4. By now, you will see ThemeRoller “Roll your own” tab has loaded your custom values. However, the page appearance does not change until you enter any value box and hit Enter out.
Solution Two. It enables you to add your customised theme to ThemeRoller Gallery (temporarily), so you can switch and compare.
1. Same as Solution One
2. Same as Solution One
3. Find an <a> element of a Gallery theme and change its href. For example, the first theme in Gallery, its href is
http://jqueryui.com/themeroller/css/parseTheme.css.php?ffDefault=Trebuchet+MS,+Tahoma,+Verdana,+Arial,+sans-serif&fwDefault=bold&fsDefault=1.1em&cornerRadius=4px&bgColorHeader=f6a828&bgTextureHeader=12_gloss_wave.png&bgImgOpacityHeader=35&borderColorHeader=e78f08&fcHeader=ffffff&iconColorHeader=ffffff&bgColorContent=eeeeee&bgTextureContent=03_highlight_soft.png&bgImgOpacityContent=100&borderColorContent=dddddd&fcContent=333333&iconColorContent=222222&bgColorDefault=f6f6f6&bgTextureDefault=02_glass.png&bgI…gOpacityHighlight=75&borderColorHighlight=fed22f&fcHighlight=363636&iconColorHighlight=228ef1&bgColorError=b81900&bgTextureError=08_diagonals_thick.png&bgImgOpacityError=18&borderColorError=cd0a0a&fcError=ffffff&iconColorError=ffd27a&bgColorOverlay=666666&bgTextureOverlay=08_diagonals_thick.png&bgImgOpacityOverlay=20&opacityOverlay=50&bgColorShadow=000000&bgTextureShadow=01_flat.png&bgImgOpacityShadow=10&opacityShadow=20&thicknessShadow=5px&offsetTopShadow=-5px&offsetLeftShadow=-5px&cornerRadiusShadow=5px
Change to
http://jqueryui.com/themeroller/css/parseTheme.css.php?ffDefault=Lucida+Grande,+Lucida+Sans,+Arial,+sans-serif&fwDefault=bold&fsDefault=1.1em&cornerRadius=5px&bgColorHeader=5c9ccc&bgTextureHeader=12_gloss_wave.png&bgImgOpacityHeader=55&borderColorHeader=4297d7&fcHeader=ffffff&iconColorHeader=d8e7f3&bgColorContent=fcfdfd&bgTextureContent=06_inset_hard.png&bgImgOpacityContent=100&borderColorContent=a6c9e2&fcContent=222222&iconColorContent=469bdd&bgColorDefault=dfeffc&bgTextureDefault=02_glass.png&bgImgOpacityDefault=85&borderColorDefault=c5dbec&fcDefault=2e6e9e&iconColorDefault=6da8d5&bgColorHover=d0e5f5&bgTextureHover=02_glass.png&bgImgOpacityHover=75&borderColorHover=79b7e7&fcHover=1d5987&iconColorHover=217bc0&bgColorActive=f5f8f9&bgTextureActive=06_inset_hard.png&bgImgOpacityActive=100&borderColorActive=79b7e7&fcActive=e17009&iconColorActive=f9bd01&bgColorHighlight=fbec88&bgTextureHighlight=01_flat.png&bgImgOpacityHighlight=55&borderColorHighlight=fad42e&fcHighlight=363636&iconColorHighlight=2e83ff&bgColorError=fef1ec&bgTextureError=02_glass.png&bgImgOpacityError=95&borderColorError=cd0a0a&fcError=cd0a0a&iconColorError=cd0a0a&bgColorOverlay=aaaaaa&bgTextureOverlay=01_flat.png&bgImgOpacityOverlay=0&opacityOverlay=30&bgColorShadow=aaaaaa&bgTextureShadow=01_flat.png&bgImgOpacityShadow=0&opacityShadow=30&thicknessShadow=8px&offsetTopShadow=-8px&offsetLeftShadow=-8px&cornerRadiusShadow=8px
The thumbnail of the theme won’t change unless you change the src of <img> inside <a>. I assume you won’t bother about changing the thumbnail as long as you know which thumbnail represents your theme.
You can change more than one theme in Gallery to various versions of your theme, so you can click and switch between them quickly.
When I use dual displays watching YouTube video, it can not switch to full screen mode correctly. I assume it is because YouTube flash client calculate width and height based on the total of dual displays, and render the video into one display. So it is only displayed in 1/4 size of one display (my two displays are of same resolution).
I have tested how videos from 163.com and sina.com are rendered in full screen mode with dual displays. I find both of them are fine. So it eliminates the possibility that bug is in Flash Player.
BTW, I did not find a way to stretch the video into two displays.
I started coding for jqol – thoughts from last week. But I ran into some dilemma.
A very important UI of an eshop is the menu. However, I do not have a mature jQuery UI menu (jQuery menu) widget to use. jQuery menu widget is only available from jQuery UI 1.9, which is still in a stage of milestone 3. The most recent jQuery menu can only theme a flat menu. It can not theme nested (or so called hierarchy) menu. In short, it is useless.
Luckily, Filament Group contributed a very sophisticated jQuery menu UI plugin (fg menu). It can theme flat or hierarchy menu into different styles – flat, flyout, ipod. However, when I try to use it, I find fg menu is based on a different concept to jQuery menu. Fg menu is simulating an OS start menu, and the object being menued is the start button, i.e. use the following code to initialise a menu.
jQuery("button").menu({options}); //menu content inside options
While jQuery menu is exactly a Magento menu, i.e. use the following code to initialise a menu.
jQuery("#nav").menu({options}); //jQuery("#nav").html() itself is the menu content
I am more comfortable taking jQuery core team’s logic, specially in the case of converting Magento menu to jQuery menu widget. Someone from jQuery team has clarified they are of different structures. The status quo is Magento core team’s menu is not completed, but fg menu is something I can use now. So my decision is –
Stay with fg menu for now, and change my code when jQuery menu is mature with all the options I want.
好久不逛 Tesco 了，昨天发现 Tesco 开卖大白兔奶糖。
不光有大白兔奶糖，还多了一些以前只有在中国店才能买到的食品。我有种莫名的兴奋，虽然大白兔奶糖本身不代表什么，而且自从冠生园月饼事件以后我很少吃大白兔奶糖，但它口味还是我喜欢的，我也希望老外喜欢。我的兴奋，深究一下，大概是因为这些货品的包装跟在中国的销售包装基本保持一致，预示着中国货从 OEM 里走出来了？
Tesco 一向对市场的反应很灵敏。这次 Tesco 又做了一件了不起的事情，在四大超市中首先销售这些货品。我的购物多了一个选择，但中国店主们听了可能会不高兴。
Magento 1.5.0.0 各测试版的发布很紧密，我有些应接不暇。新功能来不及去试，倒发现一个老功能不灵光了，就是 Magento admin panel 里显示来自官方的 notifications 的 “Go to messages index” 的链接地址不正确，点了仍是当前页面。
因为我有个 fpcp 模块改动了一些 global messages 和 messages 的显示逻辑，是基于 Magento 1.4.2.0 开发的，一开始我还以为是我的改动与 1.5.0.0 不兼容。但我把 fpcp 整个 disable，”Go to messages index” 也同样不工作，这下我才想到是 Magento 1.5.0.0 bug。
还没来得及 report bug to Magento，我又发现 Magento 1.5.0.0 rc1 版已经修正了这个 bug。去看了 release notes，果然提到 Fixed “Go to notifications” link works improperly。
About a year ago, I noticed some category or product attributes, for example, sku, path, etc., were given backend type “static” in class Mage_Catalog_Model_Resource_Eav_Mysql4_Setup. But I failed to find out what static meant here, or I did not know what the difference was between static and datetime/decimal/int/text/varchar. All I knew at that time was if I gave my user defined attribute a “static” type, the attribute values were stored in _varchar table.
Recently, I dived deeper into Magento EAV module. Now I can answer my question.
An entity can have some “static” attributes, whose values are stored in entity main table. Take sku for example, sku values are stored in catalog_product_entity table. Although sku is varchar type, its values are not stored in catalog_product_entity_varchar. Magento does not lookup catalog_product_entity_varchar for sku values because in eav_attribute table, sku backend type is defined as “static”.
It also explains why I can get sku values without add it to select, but I can not do the same with non static attributes.
$collection = Mage::getModel('catalog/product')->getCollection();
echo $collection->getFirstItem()->getSku();
It will output the sku.
$collection = Mage::getModel('catalog/product')->getCollection();
echo $collection->getFirstItem()->getName();
It will not output the name.
$collection = Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('name');
echo $collection->getFirstItem()->getName();
Calling addAttributeToSelect is a must to retrieve non static attribute values.
For user defined attributes of existing entity, if I do not change the structure of main entity table, even I specify backend as “static” in entity setup class, Magento has nowhere to store their values to but fallback to _varchar table.