visibility

问题 Other than self.class.send :method, args... , of course. I'd like to make a rather complex method available at both the class and instance level without duplicating the code. UPDATE: @Jonathan Branam: that was my assumption, but I wanted to make sure nobody else had found a way around. Visibility in Ruby is very different from that in Java. You're also quite right that private doesn't work on class methods, though this will declare a private class method: class Foo class <<self private def

问题 I am trying to set multiple DataTriggers on my Button . I did some research and found that MultiDataTrigger allows you to do this. I want the Visibility property of my Button to be set to false if the CCTVPath == string.Empty OR PermissionsFlag == false . This is what I have so far; <Button Grid.Column="3" x:Name="cctvFeedButton" Content="Live Feed" Width="100" FontSize="16" HorizontalAlignment="Right" Margin="5" Click="OnCCTVButtonClick"> <Button.Style> <Style TargetType="Button"> <Style

问题 As far as I undestand, neither a ViewStub nor a View that's GONE participate in the measure and layout passes (or rendering anyway). Is there a difference in rendering performance? What's the best practice about when to use which? 回答1: The rendering performance comes into picture when you are inflating the views. My guess is that its much cheaper to inflate a ViewStub than to inflate a View, either from XML or by changing visibility. ViewStub is especially used when you need to add/remove

问题 Let's say we have a class class Foo { int x; Foo() { x = 5; } } and some client code public static void main(String[] args) { Foo foo = new Foo(); new Thread(() -> { while (true) { new Thread(() -> { if (foo.x != 5) { throw new AssertionError("this statement is false 1"); } new Thread(() -> { if (foo.x != 5) { throw new AssertionError("this statement is false 2"); } }).start(); }).start(); } }).start(); } Is it impossible for an AssertionError to be thrown because happens-before is transitive

问题 I use the same constant in all my php files. I do not want to assign the value of this variable in all my files. So, I wanted to create one "parameters.php" file and to do the assignment there. Then in all other files I include the "parameters.php" and use variables defined in the "parameters.php". It was the idea but it does not work. I also tried to make the variable global . It also does not work. Is there a way to do what I want? Or may be there some alternative approach? 回答1: That is

问题 Simple as that, can we emulate the "protected" visibility in Javascript somehow? 回答1: Do this: /* Note: Do not break/touch this object */ ...code... Or a bit of google found this on the first page: http://blog.blanquera.com/2009/03/javascript-protected-methods-and.html 回答2: Sure you can. Here's another example. 回答3: What could that possibly mean? You don't have classes . I suppose you could analyze caller to determine whether it meets some set of criteria for being permitted to call a method.

问题 I have a status message located on the first row of my grid and I want it to slide in and out when the visibility changes. The first visibility trigger works great and slides the first grid row open quickly. As soon as I add the 'Collapsed' trigger, nothing works at all. How do I reverse the animation to slide closed when the visibility is set to collapsed? <Grid Grid.Row="0" Height="55" Visibility="{Binding StatusMessageVisibility, Mode=TwoWay}"> <Grid.Style> <Style TargetType="Grid"> <Style

问题 Hello I have to load an ajax element into div. That div would earlier have another sub div by the name div1, and to remove/hide the div1, I am doing a Ext.get('div1').hide(). But this is doing a visibility:hidden , rather than doing a display:none . I wanted to know what is the method to do a display:none rather than a visibility:hidden . 回答1: You have to change the visibility mode to display. var element = Ext.get('div1'); element.setVisibilityMode(Ext.Element.DISPLAY); element.hide(); 来源：

问题 Assuming I have a select like this: <select size="4"> <option id="1">Please wait ...</option> <option id="2">Please wait ...</option> <option id="3">Please wait ...</option> <option id="4">Please wait ...</option> <option id="5">Please wait ...</option> </select> I should see a List of 4 elements having a scrollbar on the right. What i like to do now is to load the text via ajax if the option becomes visible somehow (scrolling and/or initial). EDIT: At the end, I do not load them lazy because

问题 Let's say that I have a simple layout such as this: <StackPanel> <TextBlock Text="{Binding Path=Title}" /> <TextBlock Text="{Binding Path=ShortDescription}" /> <TextBlock Text="{Binding Path=LongDescription}" /> </StackPanel> Now when I have ShortDescription set to null or empty string there's still a gap in place of second TextBlock. Is there some property to prevent an empty textblock from occupying space? Or should I use some other control? Thanks. 回答1: You want to set the visibility of