event-handling

Javascript mouse event not captured properly when mouse moved very fast

由 我是研究僧i 提交于 2019-12-01 08:24:54
I am using JavaScript mouseover and mouseout events when I move my mouse very quickly the events are not triggered. Can you tell me what the problem is? Please let me know how to solve this. Also let me know if anything else is needed. Here is the code HTML 4 => qq[ <ul id="primary"> <li id="firstTab" onmouseover="changeSecondaryMenu('index','explore');" onmouseout="changeSecondaryMenu('explore');"><a></a></li> <li id="secondTab" onmouseover="changeSecondaryMenu('home','explore');" onmouseout="changeSecondaryMenu('explore');"><a></a></li> <li id="thirdTab" onmouseover="changeSecondaryMenu(

How can I programmatically link an UIView or UIImageView with an event like “touch up inside”?

由 一笑奈何 提交于 2019-12-01 08:15:50
Interface Builder will only allow me to hook up such events for an button. But like in HTML, I just want to haven an blank UIImageView where - as soon as the user taps it - a method is invoked. I hope there is some cool programmatically way of doing that, which I don't know about. UPDATE: In my View Controller that creates the UIImageView I tried to do this: SEL actionSelector = @selector(doSomethingWhenImageIsTouched:); [self.myUIImageView addTarget:nil action:actionSelector forControlEvents:UIControlEventTouchUpInside]; The compiler gives me a warning, that UIImageView may not respond to

Parallel EventHandler

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-01 08:07:16
I want to notify my class's event subscribers without delay and simultaneously. Should I roll my own event handler; use some from FCL supporting parallelism; or default built-in System.EventHandler<T> support such way of event notification? You can use MulticastDelegate.GetInvocationList for any delegate, and then just invoke all of the component delegates in parallel. That's probably the easiest way to go. (It returns Delegate[] but you can cast each instance to the right type. You may even get away with casting the array itself - I can't remember exactly what kind of array it actually

Is it safe to replace all standard event handler to WeakEventManager or its varian?

由 落花浮王杯 提交于 2019-12-01 07:42:44
问题 Standard event handler (with operator += ) is one of the memory leakage cause (if it is not unresgistered/disposed (with -= operator)). And Microsoft solved it with WeakEventManager and its inheritance like: PropertyChangedEventManager, CollectionChangedEventManager, CurrentChangedEventManager, ErrorsChangedEventManager and so on. The simple example code with memory leakage is: public class EventCaller { public static event EventHandler MyEvent; public static void Call() { var handler =

How can I programmatically link an UIView or UIImageView with an event like “touch up inside”?

由 喜夏-厌秋 提交于 2019-12-01 07:24:31
问题 Interface Builder will only allow me to hook up such events for an button. But like in HTML, I just want to haven an blank UIImageView where - as soon as the user taps it - a method is invoked. I hope there is some cool programmatically way of doing that, which I don't know about. UPDATE: In my View Controller that creates the UIImageView I tried to do this: SEL actionSelector = @selector(doSomethingWhenImageIsTouched:); [self.myUIImageView addTarget:nil action:actionSelector forControlEvents

Why doesn't a simple click: function()… work in ExtJS?

由 老子叫甜甜 提交于 2019-12-01 07:10:28
问题 When the user clicks on this element, I want it to show an alert. However, when I click on the DIV that this Panel generates, nothing happens. How can I make an alert execute when the user clicks on the following panel? var content = new Ext.Panel({ region:'center', margins:'5 0 5 5', cls:'empty', bodyStyle:'background:ivory; font-size: 13pt', html:'<p id="test123">This is where the content goes for each selection.</p>', click: function() { alert('was clicked'); } }); 回答1: You haven't

How to update page data after event handling?

由 我们两清 提交于 2019-12-01 07:02:31
问题 On Page_Init I create a table of dynamically created controls based on a couple of database tables. One of the controls is an ImageButton for moving an list item up the list. What this event handler does is to update the SortOrder column in the database for the affected items. Now the problem is that since the controls are created in the Page_Init event and the SortOrder is updated later on when the ImageButton command event is fired. What's the best procedure for updating the table with the

Parallel EventHandler

由 跟風遠走 提交于 2019-12-01 06:58:38
问题 I want to notify my class's event subscribers without delay and simultaneously. Should I roll my own event handler; use some from FCL supporting parallelism; or default built-in System.EventHandler<T> support such way of event notification? 回答1: You can use MulticastDelegate.GetInvocationList for any delegate, and then just invoke all of the component delegates in parallel. That's probably the easiest way to go. (It returns Delegate[] but you can cast each instance to the right type. You may

Catch ESC key press event when editing a QTreeWidgetItem

由 僤鯓⒐⒋嵵緔 提交于 2019-12-01 06:53:44
问题 I'm developing a project in Qt. I have a QTreeWidget(filesTreeWidget) whith some file names and a button for creating a file. The Create button adds to the filesTreeWidget a new item(the item's text is "") who is edited for choosing a name. When I press ENTER, the filename is send through a socket to the server. The problem comes when I press ESC because the filename remains "" and is not send to the server. I tried to overwrite the keyPressEvent but is not working. Any ideas? I need to catch

Why e.Source depends on TreeView populating method?

由 你说的曾经没有我的故事 提交于 2019-12-01 06:44:26
问题 I have two trees: fooTree - made up of elements, barTree - constructed by Both trees have MouseRightButtonDown event, but the e.Source type differs: fooTree - System.Windows.Controls.TreeViewItem barTree - System.Windows.Controls.TreeView Why e.Source differs? Also, how can I get the clicked item for the barTree? Markup: <TreeView Name="fooTree" MouseRightButtonDown="fooTree_MouseDown"> <TreeViewItem Header="foo"></TreeViewItem> <TreeViewItem Header="foo"></TreeViewItem> </TreeView> <TreeView
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