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  • In Mac OS X Finder's column view, how do you show all columns, up to the list of volumes?

    - by John Douthat
    In OS X's olden times, column view always allowed you to scroll left back to the list of volumes. In recent versions, however, the Finder will hide parents and ancestors. For example, when you select a favorite "place" in the sidebar, no ancestors of that folder will be visitable without pressing Cmd+Up, but hitting Cmd+Up causes the current directory to lose focus, or disappear entirely, depending on the number of levels . Clicking "Back" sends you back to the folder you where in, but it also re-hides all of its ancestors :( I really wish I could see the entire hierarchy. Is that possible?

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  • What cause high CPU usage on the server during file upload

    - by bosiang
    When I try to upload a huge file size (approx 2GB), the server cpu usage goes really high. What should I do to fix this? I just use standard html form and php, for file upload. I'm sorry if I post on the wrong forum. Please point me to the right direction here is the result of "top" command during uploading 4 files (18mb, 38mb, 60mb, 33mb) 1904 apache 20 0 33504 5740 1952 R 28.3 0.2 0:02.19 httpd 1905 apache 20 0 33504 5740 1952 R 28.3 0.2 0:01.99 httpd 1903 apache 20 0 33232 6968 3060 R 28.0 0.2 0:01.98 httpd 1910 apache 20 0 33240 6020 2248 S 11.5 0.2 0:02.85 httpd 2133 root 20 0 2656 1124 896 R 1.6 0.0 0:00.71 top 1 root 20 0 2864 1404 1188 S 0.0 0.0 0:03.99 init the code for chunking, although eventhough I don't use this code (just simple file upload), it still cause that high cpu usage function sendRequest() { //clean the screen //bars.innerHTML = ''; var file = document.getElementById('fileToUpload'); for(var i = 0; i < file.files.length; i++) { var blob = file.files[i]; var originalFileName = blob.name; var filePart = 0 const BYTES_PER_CHUNK = 100 * 1024 * 1024; // 10MB chunk sizes. var realFileSize = blob.size; var start = 0; var end = BYTES_PER_CHUNK; totalChunks = Math.ceil(realFileSize / BYTES_PER_CHUNK); alert(realFileSize); while( start < realFileSize ) { if (blob.webkitSlice) { //for Google Chrome var chunk = blob.webkitSlice(start, end); } else if (blob.mozSlice) { //for Mozilla Firefox var chunk = blob.mozSlice(start, end); } uploadFile(chunk, originalFileName, filePart, totalChunks, i); filePart++; start = end; end = start + BYTES_PER_CHUNK; } } }

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  • How do I trap the mouse pointer within a VirtualBox Guest OS?

    - by Samuel
    I'm on a Mac Mini 2011 with VirtualBox installed. I have Windows 7 running as a Guest OS. My question: How do I "trap" my mouse pointer within Windows? In other words, I don't want my mouse to move outside to the Host OS. Ideally, I would be able to press the Host key to "untrap" my mouse. The purpose: I'm playing Warcraft 3 in the Guest OS and I can't scroll the screen since the mouse keeps jumping to the Host OS instead of scrolling the screen. This happens even in full-screen mode.

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  • tmux -- any way to enable scrolling, but not selection?

    - by gatoatigrado
    I like that when mode-mouse is on in tmux, I can scroll through the buffer, but I don't like that I can't copy stuff to my OS clipboard by selecting it (as when tmux is disabled). Question: Is there any way to enable mouse scrolling, but not selection? I'm using KDE's konsole, if it matters. I've tried setting, set -g mouse-select-pane off set -g mouse-select-window off but no luck -- the only difference seems to be whether mode-mouse is on (tmux captures scrolling and selection) or off (tmux captures neither scrolling nor selection).

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  • Simple way to get keys/mouse buttons working in Synergy (mac client, pc server)

    - by Damon
    I'm trying to get Synergy working running as client on my Mac with SynergyKM Preferences panel. It's performing generally fine (just some real slow downs when my network is under heavy use, usually from youtube videos). The main thing I want to get working is none of the special buttons on my mouse are working on the client.. just the scroll and middle click.. but I have back/forward buttons I'd like to have working. Also my Windows Comfort Curve Keyboard has some extra keys and I'd like to know how to set those up to perform operations on my Mac client. I could have sworn that home/end weren't working but they seem to be now.. perhaps it's application specific..

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  • Can I filter multiple column headers to display subheadings of each in Excel?

    - by Gigi
    I can't seem to find this anywhere... it may not even be possible without coding? I have a spreadsheet containing more than one heading in a single column. These headings are identified with blue background and white font. Each of these headings have items listed below them. These "subheadings" are smaller, auto-black font and no fill background. Currently I have to scroll down the spreadsheet to view all headers and their contents. How do I create a filter that would allow me to sort on whichever header I want, so that (only) the contents of that particular header are displayed?

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  • MacMini transmit rate stuck at 11, every other device can connect at full 54Mbit/s?

    - by chum of chance
    I have a MacMini circa 2007 that's getting very low transmit rates via wifi, 8-11. I have other devices that are getting full 54, including a MacBook Air. With everything else off, the MacMini doesn't want to seem to go any faster. Since it has been previously connected to ethernet its entire life, I was wondering if there were some settings I can change to speed up the connection. Option-clicking the network icon gives this read out: PHY Mode: 802.11g Channel: 1 (2.4 Ghz) Security: WPA2 Personal RSSI: -73 Transmit Rate: 11 My new MacBook Air has the following readout: PHY Mode: 802.11n Channel: 1 (2.4 Ghz) Security: WPA2 Personal RSSI: -66 Transmit Rate: 79 Both have full bars and the wireless router is in the same room to eliminate any obstructions from the equation. Could the MacMini be connecting at an older protocol, like 802.11b and be reporting erroneously that it is connected at 802.11g? This would explain why I haven't seen a transmit rate above 11. Any further trouble shooting I can try before buying a new USB 802.11n device? The WiFi router is a DLink DIR-615. I can see other devices, and none, even the other g connected devices, are getting below 30-40 MBit/s. What's going on here?

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  • How to reduce the pain of the command prompt

    - by Adam
    I want to learn to use the command prompt better on Windows to have more control over what I do and just for the learning experience. The main annoyance I have right now is all of the typing. If I want to perform an operation on a file with a large path I'm sitting there typing it out for a minute at least, and if I make a mistake I have to press the up arrow key and scroll through the entire thing and find what I did wrong. Is there any tools to make this easier?

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  • Run shell script on Linux box from a shortcut/app in Android?

    - by melat0nin
    I have an Ubuntu box which runs XBMC, which crashes occasionally. Since I have no keyboard connected,I have to SSH in, kill xinit, then restart it. I was wondering if there's an elegant way of doing this from my Android tablet, so I don't have to go to my desktop PC. I've used ConnectBot and can log in, but typing is laborious, even using the edit keys to scroll back up through the buffer. It seems as though it should be possible to script this so that I can execute a shortcut, or at least select a predefined script to be executed. This would seem to have plenty of applications, and there could be a site of scripts - restart webserver, reboot, email logs etc

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  • Resize windows command line prompt?

    - by Yuval
    I'm working on a Windows xp machine. I wrote a program in assembly that outputs some text, and am trying to create a screenshot of the command line output (start-run-"cmd"). The problem is that the text initially printed by the program gets pushed up by later text and I cannot scroll to it. I tried playing around with the width and height under properties = layout but it seems to resize the window itself (the borders) without resizing the textarea inside the window (text does not have more "room", but the window is bigger). Does anybody know a workaround/solution for this? Thank you!

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  • How to move your focus out of the text?

    - by Aerovistae
    I've got a PDF open in Acrobat. I like to scroll the "standard" way, where I can press the arrow key up to go up by a line or two, and the arrow key down for the opposite. But sometimes I accidentally click the text, and then suddenly the arrow keys control moving the cursor around inside the page instead, so I have to hold it down and move the cursor all the way to the bottom of the page before it'll start scrolling the page down, and then all the way back up if I want to go up again. I can't find any way to move focus out of the text once I've clicked it. I actually have to close Acrobat and reopen the PDF. It's kind of amazing. Solutions?

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  • How to make using command prompt less painful

    - by Adam
    I want to learn to use the command prompt better on Windows to have more control over what I do and just for the learning experience. The main annoyance I have right now is all of the typing. If I want to perform an operation on a file with a large path I'm sitting there typing it out for a minute at least, and if I make a mistake I have to press the up arrow key and scroll through the entire thing and find what I did wrong. Is there any tools to make this easier?

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  • Is there a proper way to clear logs?

    - by John H.
    I was wondering if there was a proper way to clear logs in general? I'm new to Ubuntu and I'm trying to set up Postfix. The log in question is /var/log/mail.log. I was wondering if there was a correct way to clear it, rather than me going in it and deleting all the lines and saving it. I find that sometimes errors don't get written to it immediately after I clear the log and save it. Side note: I'm having trouble setting up Postfix and am trying to make it easier for me to read the logs hoping it can help me out, instead of having to scroll all the way down.

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  • Include new rows in autofilter range

    - by user9645
    I am working with an excel 2007 worksheet that has the "filter" applied so that each column heading has a pull-down menu for sorting. When I add new rows to the end of the table by cut-n-paste from the last row, these new rows are not included in the sorting. I can't seem to get the newly added rows to be included in the filter range. I tried un-selecting and re-selecting the "filter" button and also tried the "reapply" button. The "clear" button is always greyed out. I can't seem to find any relevant help for this online anywhere. Not sure if it matters, but the heading row and the first column are set to be "sticky" (they don't scroll with the rest of the table.)

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  • Windows Mobile 6.5 Remote desktop

    - by mpop
    I am trying to help a friend out, we have gotten him able to connect via his windows mobile 6.5 phone to his computer via remote desktop. The problem we are running into is that the program that he needs to be able to access does not work at lower resolutions (such as his phone has) and most of the program screen is cut off (it is a VB program) Is there a way to have a "higher" resolution on the screen being sent to the Windows Mobile 6.5 phone and just have him scroll up and down on the screen? Right now replacing the phone is not an option (it might be 6 months down the line, but for now it is not an option).

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  • Can't install flash on Firefox or Chrome (but works fine on IE...)

    - by WP
    I'm using a work computer (Lenovo) that I recently got from my IT department to replace an old machine. When I installed Firefox and Chrome, I needed to install Adobe Flash. However, the installation has failed on several occasions. I've taken all the usual steps: closing all programs and windows, installing updates and restarting machine, etc, but still the installation does not work. The download manager and status bars say that installation is complete, but I still can't view flash sites on FF or Chrome. Flash is working fine on IE though. Last thing: when I reboot the first dialog box that comes up is from Adobe Download Manager, and it says "Please shut down Internet Explorer before uninstall can complete". I'm confused since a) I've just rebooted so have yet to start IE and b) why UNinstall? My company does not support non-IE browsers so I'm not getting much help from our IT department. If necessary I can post screenshots of error messages and stuff if it comes to that, but hopefully someone will be able to diagnose the problem before that's necessary as I'm not the most tech savvy (despite being a huge fan of reddit...)

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  • MySql in Bash: Show only errors

    - by TRWTFCoder
    Let me first start off by saying I am not an experienced linux user. I am trying to debug a mysql script in linux, however, my issue is that most of the queries are successful so I can not see the error messages because they scroll off the screen. I am executing the queries from a large file using the \. command. I was wondering if there was a way to show ONLY the error messages when I exececute the sql file. Right now it is showing both error messages and Query OK,.... I don't really care about the queries that are ok, just the errors. Thanks!

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  • Why do Floatbox popups stop other animations when finished closing?

    - by isherwood
    I'm trying to essentially run a callback function when a Floatbox popup is closed via a hyperlink inside the popup. I want the page to scroll to the top and my login box to fade in. I'm using the following code: function showLogin() { jQuery('#header_no_theme_login_popup', parent.document.body).show(); window.parent.window.scrollTo(0,0); window.parent.fb.end(); } This works fine, but if I try to use jQuery fadeIn, the fade effect is truncated when the Floatbox popup finishes closing, leaving it with partial opacity. jQuery scrollTo doesn't seem to want to work at all. Thanks much.

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  • How to Edit or Add a New Row in jqGrid

    - by Paul
    My jqGrid that does a great job of pulling data from my database, but I'm having trouble understanding how the Add New Row functionality works. Right now, I'm able to edit inline data, but I'm not able to create a new row using the Modal Box. I'm missing that extra logic that says, "If this is a new row, post this to the server side URL" instead of modifying existing data. (Right now, hitting Submit only clears the form and reloads the grid data.) The documentation states that Add New Row is: jQuery("#editgrid").jqGrid('editGridRow',"new",{height:280,reloadAfterSubmit:false}); but I'm not sure how to use that correctly. I've spent alot of time studying the Demos, but they seem to all use an external button to fire the new row command, rather than using the Modal Form, which I want to do. My complete code is here: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>jqGrid</title> <link rel="stylesheet" type="text/css" media="screen" href="../css/ui-lightness/jquery-ui-1.7.2.custom.css" /> <link rel="stylesheet" type="text/css" media="screen" href="../css/ui.jqgrid.css" /> <script src="jquery-1.3.2.min.js" type="text/javascript"></script> <script src="../js/i18n/grid.locale-en.js" type="text/javascript"></script> <script src="jquery.jqGrid.min.js" type="text/javascript"></script> </head> <body> <h2>My Grid Data</h2> <table id="list" class="scroll"></table> <div id="pager" class="scroll c1"></div> <script type="text/javascript"> var lastSelectedId; jQuery('#list').jqGrid({ url:'grid.php', datatype: 'json', mtype: 'POST', colNames:['ID','Name', 'Price', 'Promotion'], colModel:[ {name:'product_id',index:'product_id', width:25,editable:false}, {name:'name',index:'name', width:50,editable:true, edittype:'text',editoptions:{size:30,maxlength:50}}, {name:'price',index:'price', width:50, align:'right',formatter:'currency', editable:true}, {name:'on_promotion',index:'on_promotion', width:50, formatter:'checkbox',editable:true, edittype:'checkbox'}], rowNum:10, rowList:[5,10,20,30], pager: $('#pager'), sortname: 'product_id', viewrecords: true, sortorder: "desc", caption:"Database", width:500, height:150, onSelectRow: function(id){ if(id && id!==lastSelectedId){ $('#list').restoreRow(lastSelectedId); $('#list').editRow(id,true,null,onSaveSuccess); lastSelectedId=id; }}, editurl:'grid.php?action=save'}) .jqGrid('navGrid','#pager', {refreshicon: 'ui-icon-refresh',view:true}, {height:280,reloadAfterSubmit:true}, {height:280,reloadAfterSubmit:true}, {reloadAfterSubmit:true}) .jqGrid('editGridRow',"new",{height:280,reloadAfterSubmit:false}); function onSaveSuccess(xhr) {response = xhr.responseText; if(response == 1) return true; return false;} </script></body></html> If it makes it easier, I'd be willing to scrap the inline editing functionality and do editing and posting via modal boxes. Any help would be greatly appreciated.

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  • asp.net mvc jquery + tabs +jqgrid +jqgrid loaded only for first tab

    - by niao
    Greetings, I have a problem using jqgrid and jquery tab (I am coding in asp.net mvc) I have two tabs. Each tabs should contains jqgrid with different data. I specify tabs as follows: <script type="text/javascript"> $(document).ready(function() { $("#tabs").tabs(); getContentTab (1); }); function getContentTab(index) { var url='<%= Url.Content("~/Admin/GetWorkspaces") %>/' + index; var targetDiv = "#tabs-" + index; var ajaxLoading = "<img id='ajax-loader' src='<%= Url.Content("~/Content") %>/ajax-loader.gif' align='left' height='28' width='28'>"; $(targetDiv).html("<p>" + ajaxLoading + " Loading...</p>"); $.get(url,null, function(result) { $(targetDiv).html(result); }); } </script> <div id="tabs"> <ul> <li><a href="#tabs-1" onclick="getContentTab(1);">tab1</a></li> <li><a href="#tabs-2" onclick="getContentTab(2);">tab2</a></li> </ul> <div id="tabs-1"> </div> <div id="tabs-2"> </div> </div> As seen above GetWorkspaces action gets my tabs: public ActionResult GetWorkspaces(int id) { string viewName = string.Empty; switch (id) { case 1: viewName = "MarketplaceOfferView"; break; case 2: viewName = "MyMessagesView"; break; } return PartialView(viewName); } each of view is a partial view. In these partial views I have jqgrids specified as follows: <script type="text/javascript"> jQuery("#list").ready(function() { jQuery("#list").jqGrid({ url: '/Admin/GetGridData/', datatype: 'json', mtype: 'GET', colNames: ['Klient', 'Zapytanie', 'Atrakcyjnosc', 'Cena', 'Data poczatkowa', 'Data koncowa', 'Branza', 'Lokalizacja' ], colModel: [ { name: 'CompanyName', index: 'CompanyName', width: 150, align: 'left' }, { name: 'Content', index: 'ContactName', width: 300, align: 'left' }, { name: 'Rating', index: 'Address', width: 150, align: 'left' }, { name: 'Price', index: 'City', width: 150, align: 'left' }, { name: 'Price', index: 'City', width: 150, align: 'left' }, { name: 'Price', index: 'City', width: 150, align: 'left' }, { name: 'Price', index: 'City', width: 150, align: 'left' }, { name: 'Price', index: 'PostalCode', width: 100, align: 'left' } ], pager: jQuery('#pager'), rowNum: 100, rowList: [5, 10, 20, 50], sortname: 'Operator.FullName', sortorder: "asc", viewrecords: true, imgpath: '/scripts/themes/steel/images', caption: 'Historia moich wiadomosci', height:400 }); // .navGrid(pager, { edit: true, add: false, del: false, refresh: true, search: false }); }); </script> Historia moich wiadomosci <table id="list" class="scroll" cellpadding="0" cellspacing="0" width="100%"> </table> <div id="pager" class="scroll" style="text-align: center;"> </div> For second view I have an action: /Admin/GetGridDataForTab2/ THe problem is that I see a jqgrid only when I click on first tab. When I click on second tab the grid is not displayed and /Admin/GetGridData/ is not executed. Does anybody have an idea what is wrong?

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  • Silverlight: Scrolling with a StackPanel

    - by programatique
    I have a grid, 3 by 3 (3 rowdefinitions and 3 columndefinitions). I want some content (a StackPanel) in one of those grid cells to scroll. I'm fairly sure this is possible but I cannot figure out how. I've tried adding ScrollViewers and Scrollbar controls to the grid cell I want to scroll, but this usually ends up creating scrolling for the entire page. Edit: My issue is more specificlly how I can get scrolling over a StackPanel. An example if the issue I am having is here: <Grid x:Name="LayoutRoot"> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition/> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition/> <RowDefinition/> </Grid.RowDefinitions> <Grid> <TextBlock FontSize="16">1,1</TextBlock> </Grid> <Grid Grid.Column="1"> <TextBlock FontSize="16">1,2</TextBlock> </Grid> <Grid Grid.Row="1"> <TextBlock FontSize="16">2,1</TextBlock> </Grid> <Grid Grid.Column="1" Grid.Row="1"> <StackPanel> <TextBlock>Title</TextBlock> <Grid> <ScrollViewer> <StackPanel> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> <TextBlock FontSize="32">2,2</TextBlock> </StackPanel> </ScrollViewer> </Grid> </StackPanel> </Grid> </Grid>

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  • WPF DataGrid does not scoll on drag

    - by Greg R
    I have a strange problem with a WPF DataGrid from WPF Toolkit. The scrollbars appear correctly when the number of rows grows, and the scrolling works when you press up or down arrows on the scrollbar. The problem comes in when I try to drag the scrollbar on the datagrid. My page has a scroll viewer around it. When I click and drag the scrollbar on the grid, it scrolls the page scroller instead. If the scrollbar does not apear on the page, there grid still does not scroll. Is there a workaround for this??? Would really appreciate some help with this issue! For example, in this case if the page is < 280, it scrolls on drag. But drag scrolling does not work on the grid. <ScrollViewer ScrollViewer.IsDeferredScrollingEnabled="True" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" > <DockPanel> <dg:DataGrid HorizontalScrollBarVisibility="Auto" SelectionMode="Single" CanUserAddRows="False" CanUserDeleteRows="False" CanUserResizeColumns="False" CanUserSortColumns="False" AutoGenerateColumns="False" RowHeaderWidth="17" ItemsSource="{Binding Path=OrderSearchVm}" IsReadOnly="True" MaxHeight="280" DockPanel.Dock="Top"> <dg:DataGrid.Columns> <dg:DataGridTextColumn Width="75" Header="Date" Binding="{Binding Path=OrderDate}" > <dg:DataGridTextColumn.ElementStyle> <Style TargetType="{x:Type TextBlock}"> <Setter Property="TextWrapping" Value="Wrap" /> </Style> </dg:DataGridTextColumn.ElementStyle> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Type" Binding="{Binding Path=OrderType}" Width="45"/> <dg:DataGridTextColumn Header="Shipping Name" Binding="{Binding Path=ShipToName}" Width="115"> <dg:DataGridTextColumn.ElementStyle> <Style TargetType="{x:Type TextBlock}"> <Setter Property="TextWrapping" Value="Wrap" /> </Style> </dg:DataGridTextColumn.ElementStyle> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="Shipping Address " Binding="{Binding Path=ShipToAddress}" Width="160"> <dg:DataGridTextColumn.ElementStyle> <Style TargetType="{x:Type TextBlock}"> <Setter Property="TextWrapping" Value="Wrap" /> </Style> </dg:DataGridTextColumn.ElementStyle> </dg:DataGridTextColumn> <dg:DataGridTextColumn Header="E-Mail" Binding="{Binding Path=Email}" Width="140"> <dg:DataGridTextColumn.ElementStyle> <Style TargetType="{x:Type TextBlock}"> <Setter Property="TextWrapping" Value="Wrap" /> </Style> </dg:DataGridTextColumn.ElementStyle> </dg:DataGridTextColumn> </dg:DataGrid.Columns> </dg:DataGrid> </DockPanel> </ScrollViewer>

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  • iPhone/Obj-C: Accessing a UIScrollView from a View displayed within it.

    - by Daniel I-S
    I'm writing a simple iPhone app which lets a user access a series of calculators. It consists of the following: UITableViewController (RootViewController), with the list of calculators. UIViewController + UIScrollView (UniversalScroller), which represents an empty scroll view - and has a 'displayedViewController' property. UIViewController (Calculators 1-9), each of which contains a view with controls that represents a particular calculator. Each calculator takes 3-5 values via UITextFields and UISliders, and has a 'calculate' button. They can potentially be taller than 460px(iPhone screen height). The idea is: User taps on a particular menu item in the RootViewController. This loads and inits UniversalScroller, ALSO loads and inits the UIViewcontroller for the particular calculator that was selected, sets the displayedViewController property of UniversalScroller to the newly loaded calculator UIViewcontroller, and pushes the UniversalScroller to the front. When the UniversalScroller hits its 'viewDidLoad' event, it sets its contentSize to the view frame size of its 'displayedViewController' object. It then adds the displayedViewController's view as a subview to itself, and sets its own title to equal that of the displayedViewController. It now displays the calculator, along with the correct title, in a scrollable form. Conceptually (and currently; this stuff has all been implemented already), this works great - I can design the calculators how I see fit, as tall as they end up being, and they will automatically be accommodated and displayed in an appropriately configured UIScrollView. However, there is one problem: The main reason I wanted to display things in a UIScrollView was so that, when the on-screen-keyboard appeared, I could shift the view up to focus on the control that is currently being edited. To do this, I need access to the UniversalScroller object that is holding the current calculator's view. On the beganEditing: event of each control, I intended to use the [UniversalScroller.view scrollRectToVisible: animated:] method to move focus to the correct control. However, I am having trouble accessing the UniversalScroller. I tried assigning a reference to it as a property of each calculator UIViewController, but did't seem to have much luck. I've read about using Delegates but have had trouble working out exactly how they work. I'm looking for one of three things: Some explanation of how I can access the methods of a UIScrollView from a UIViewController whose view is contained within it. or Confirmation of my suspicions that making users scroll on a data entry form is bad, and I should just abandon scrollviews altogether and move the view up and down to the relevant position when the keyboard appears, then back when it disappears. or Some pointers on how I could go about redesigning the calculators (which are basically simple data entry forms using labels, sliders and textfields) to be contained within UITableViewCells (presumably in a UITableView, which I understand is a scrollview deep down) - I read a post on SO saying that that's a more pleasing way to make a data entry form, but I couldn't find any examples of that online. Screenshots would be nice. Anything to make my app more usable and naturally 'iPhone-like', since shuffling labels and textboxes around makes me feel like I am building a winforms app! I've only recently started with this platform and language, and despite being largely an Apple skeptic I definitely see the beauty in the way that it works. Help me solve this problem and I might fall in love completely. Dan

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  • How optimize code with introspection + heavy alloc on iPhone

    - by mamcx
    I have a problem. I try to display a UITable that could have 2000-20000 records (typicall numbers.) I have a SQLite database similar to the Apple contacts application. I do all the tricks I know to get a smoth scroll, but I have a problem. I load the data in 50 recods blocks. Then, when the user scroll, request next 50 until finish the list. However, load that 50 records cause a notable "pause" in loading and scrolling. Everything else works fine. I cache the data, have opaque cells, draw it by code, etc... I swap the code loading the same data in dicts and have a performance boost but wonder if I could keep my object oriented aproach and improve the actual code. This is the code I think have the performance problem: -(NSArray *) loadAndFill: (NSString *)sql theClass: (Class)cls { [self openDb]; NSMutableArray *list = [NSMutableArray array]; NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; DbObject *ds; Class myClass = NSClassFromString([DbObject getTableName:cls]); FMResultSet *rs = [self load:sql]; while ([rs next]) { ds = [[myClass alloc] init]; NSDictionary *props = [ds properties]; NSString *fieldType = nil; id fieldValue; for (NSString *fieldName in [props allKeys]) { fieldType = [props objectForKey: fieldName]; fieldValue = [self ValueForField:rs Name:fieldName Type:fieldType]; [ds setValue:fieldValue forKey:fieldName]; } [list addObject :ds]; [ds release]; } [rs close]; [pool drain]; return list; } And I think the main culprit is: -(id) ValueForField: (FMResultSet *)rs Name:(NSString *)fieldName Type:(NSString *)fieldType { id fieldValue = nil; if ([fieldType isEqualToString:@"i"] || // int [fieldType isEqualToString:@"I"] || // unsigned int [fieldType isEqualToString:@"s"] || // short [fieldType isEqualToString:@"S"] || // unsigned short [fieldType isEqualToString:@"f"] || // float [fieldType isEqualToString:@"d"] ) // double { fieldValue = [NSNumber numberWithInt: [rs longForColumn:fieldName]]; } else if ([fieldType isEqualToString:@"B"]) // bool or _Bool { fieldValue = [NSNumber numberWithBool: [rs boolForColumn:fieldName]]; } else if ([fieldType isEqualToString:@"l"] || // long [fieldType isEqualToString:@"L"] || // usigned long [fieldType isEqualToString:@"q"] || // long long [fieldType isEqualToString:@"Q"] ) // unsigned long long { fieldValue = [NSNumber numberWithLong: [rs longForColumn:fieldName]]; } else if ([fieldType isEqualToString:@"c"] || // char [fieldType isEqualToString:@"C"] ) // unsigned char { fieldValue = [rs stringForColumn:fieldName]; //Is really a boolean? if ([fieldValue isEqualToString:@"0"] || [fieldValue isEqualToString:@"1"]) { fieldValue = [NSNumber numberWithInt: [fieldValue intValue]]; } } else if ([fieldType hasPrefix:@"@"] ) // Object { NSString *className = [fieldType substringWithRange:NSMakeRange(2, [fieldType length]-3)]; if ([className isEqualToString:@"NSString"]) { fieldValue = [rs stringForColumn:fieldName]; } else if ([className isEqualToString:@"NSDate"]) { NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss"]; NSString *theDate = [rs stringForColumn:fieldName]; if (theDate) { fieldValue = [dateFormatter dateFromString: theDate]; } else { fieldValue = nil; } [dateFormatter release]; } else if ([className isEqualToString:@"NSInteger"]) { fieldValue = [NSNumber numberWithInt: [rs intForColumn :fieldName]]; } else if ([className isEqualToString:@"NSDecimalNumber"]) { fieldValue = [rs stringForColumn :fieldName]; if (fieldValue) { fieldValue = [NSDecimalNumber decimalNumberWithString:[rs stringForColumn :fieldName]]; } } else if ([className isEqualToString:@"NSNumber"]) { fieldValue = [NSNumber numberWithDouble: [rs doubleForColumn:fieldName]]; } else { //Is a relationship one-to-one? if (![fieldType hasPrefix:@"NS"]) { id rel = class_createInstance(NSClassFromString(className), sizeof(unsigned)); Class theClass = [rel class]; if ([rel isKindOfClass:[DbObject class]]) { fieldValue = [rel init]; //Load the record... NSInteger Id = [rs intForColumn:[theClass relationName]]; if (Id>0) { [fieldValue release]; Db *db = [Db currentDb]; fieldValue = [db loadById: theClass theId:Id]; } } } else { NSString *error = [NSString stringWithFormat:@"Err Can't get value for field %@ of type %@", fieldName, fieldType]; NSLog(error); NSException *e = [NSException exceptionWithName:@"DBError" reason:error userInfo:nil]; @throw e; } } } return fieldValue; }

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  • UIButtons in UIScrollView stop it scrolling, how to fix?

    - by Mark McFarlane
    Hi all, I have a problem with adding a set of UIButtons to a UIScrollView. With the buttons added it seems that the scroll command is not being passed to the scroll view as the buttons cover the whole surface. I've read various posts on this but still can't figure it out. I'm pretty new to iPhone programming so there's probably something obvious I've missed. I've tried things like canCancelContentTouches and delaysContentTouches to TRUE and FALSE. Here is the code I use to add the buttons to the scrollview. The scrollview was created in IB and is passed in to the function: -(void)drawCharacters:(NSMutableArray *)chars:(UIScrollView *)target_view { //NSLog(@"CLEARING PREVIOUS BUTTONS"); //clear previous buttons for parts/kanji if(target_view == viewParts){ for (UIButton *btn in parts_buttons) { [btn removeFromSuperview]; } [parts_buttons removeAllObjects]; } else if(target_view == viewKanji){ for (UIButton *btn in kanji_buttons) { [btn removeFromSuperview]; } [kanji_buttons removeAllObjects]; } //display options int chars_per_line = 9; //change this to change the number of chars displayed on each line if(target_view == viewKanji){ chars_per_line = 8; } int char_gap = 0; //change this to change the margin between chars int char_dimensions = (320/chars_per_line)-(char_gap*2); //set starting x, y coords int x = 0, y = 0; //increment y coord y += char_gap; //NSLog(@"ABOUT TO DRAW FIRST BUTTON"); for(NSMutableArray *char_arr in chars){ //increment x coord x += char_gap; //draw at x and y UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom]; myButton.frame = CGRectMake(x, y, char_dimensions, char_dimensions); // position in the parent view and set the size of the button [myButton setTitle:[char_arr objectAtIndex:0] forState:UIControlStateNormal]; [myButton setTitleColor:[UIColor darkGrayColor] forState:UIControlStateNormal]; [myButton setTitleColor:[UIColor colorWithRed:0.8 green:0.8 blue:0.8 alpha:1.0] forState:UIControlStateDisabled]; myButton.titleLabel.font = [UIFont boldSystemFontOfSize:22]; if(target_view == viewKanji){ myButton.titleLabel.font = [UIFont boldSystemFontOfSize:30]; } // add targets and actions if(target_view == viewParts){ [myButton addTarget:self action:@selector(partSelected:) forControlEvents:UIControlEventTouchUpInside]; } else if(target_view == viewKanji){ [myButton addTarget:self action:@selector(kanjiSelected:) forControlEvents:UIControlEventTouchUpInside]; [myButton setTag:(int)[char_arr objectAtIndex:1]]; } //if the part isnt in the current list of kanji, disable and dim it if(target_view == viewParts){ if([kanji count] > 0){ [myButton setEnabled:NO]; } bool do_break = NO; for(NSMutableArray *arr in kanji){ //NSLog([NSString stringWithFormat:@"CHECKING PARTS AGAINST %d KANJI", [kanji count]]); for(NSString *str in [[arr objectAtIndex:2] componentsSeparatedByString:@" "]){ if(([myButton.titleLabel.text isEqualToString:str])){ //NSLog(@"--------------MATCH!!!-----------------"); [myButton setEnabled:YES]; for(NSString *str1 in parts_selected){ if(([myButton.titleLabel.text isEqualToString:str1])){ [myButton setEnabled:NO]; break; } } do_break = YES; break; } if(do_break) break; } if(do_break) break; } } // add to a view [target_view addSubview:myButton]; //update coords of next button x += char_dimensions+ char_gap; if (x > (320-char_dimensions)) { x = 0; y += char_dimensions + (char_gap*2); } //add button to global array to be removed from view next update if(target_view == viewParts){ [parts_buttons addObject:myButton]; } else if(target_view == viewKanji){ [kanji_buttons addObject:myButton]; } } //NSLog(@"FINISHED DRAWING ALL BUTTONS"); } Any help on this would be greatly appreciated. I just need to fix this to finish my app.

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