visibility

问题 I have a following grid: <Grid> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> <RowDefinition Height="Auto"/> </Grid.RowDefinitions> ... <ContentPresenter Grid.Row="1" Content="{Binding Path=PredictiveWorkspace}" Visibility="{Binding Path=ShowPredictiveWorkspace, Converter={StaticResource boolToVisibility}}"/> <ContentPresenter Grid.Row="1" Content="{Binding Path=M2Workspace}" Visibility="{Binding Path=ShowStandardWorkspace, Converter={StaticResource

问题 I have made a DIV with visibility: hidden and attached a ::before pseudo-element of this DIV with visibility: visible . This works as expected in Firefox, Chrome and Safari, but in Internet Explorer 10 the pseudo-element does not render. Please explain if I'm accomplishing this wrong, or whether this is an issue with Internet Explorer. Are there any work arounds (we only have access to the CSS, not the source HTML)? JSFiddle demonstrating issue. 回答1: Filters don't work on pseudo elements in

问题 Is there any way to limit the visibility in PHP in the same way as "package" visibility works in Java or at least "friend" visibility in C++? What's the best practice to maintain large OOP project and not to let anyone use any part of code? I use private and protected visibility as much as I can but sometimes it's not enough. I know about this request: https://bugs.php.net/bug.php?id=55331. Is there any progress in implementing such thing to PHP? Is there any workaround to protect your code

问题 In xCode 3, I defined private instance variables in a class. When I directly access the private variables in the client codes, why does the compiler just show me a warning, not an error? The code can still run. The warning says this maybe a hard error in the future. What does the "hard error" mean? Thanks. 回答1: Hard Error means that sometime in the future the compiler will behave the way you expect it to behave (i.e., it won't compile the source file when you directly access an instance

问题 Can I delay binding of a ui element if the element is not currently visible. Sometimes I have a form that has some hidden/minimised elements, I would like to not update them if they are not on the screen. I suspect the answer is no, but it never hurts to ask? 回答1: There is no built in way to do this - but you can write it yourself. The trick is to wrap binding in your own markup extension that uses the original binding but adds new behavior around it (for example, by setting

问题 I have a public static class within another public class as follows: public class Foo<A> { public static class Bar<A>{ A firstBar; Bar(A setBar){ this.firstBar=setBar; } } public final Bar<A> instanceBar; public Foo(A actualValue) { instanceBar = new Bar<A>(actualValue); } public Bar<A> getBar() { return instanceBar; } My objective is to access instanceBar 's state from a separate class file without a get method and without changing the visibility of firstBar . How do I accomplish this? For

问题 I have a glsurface occupying the full screen. At the click of a button I want another layout to appear (settings type of thing). If I start with the overlay being visible, I can make it invisible and then visible again with no problem. But if I start with it invisible, I cannot make it ever visible again. Code follows: <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height=

问题 I have a Panel that I'm setting visible=true explicitly. The debugger passes over that line and visible still evaluates to False on the next line. Obviously as a result, the Panel is not shown. How is this possible? pnlValidate.Visible = true; if (IsPostBack) return; <asp:Panel ID="pnlValidate" runat="server"> <asp:Button cssclass="submit2" ID="btnValidate" runat="server" Visible="false" text="Validate" OnClick="btnValidate_Click" /> <br /> <asp:TextBox ID="txt6sql" runat="server" Visible=

问题 What is the recommended way to define private and protected methods in Objective-C? One website suggested using categories in the implementation file for private methods, another suggested trailing underscores, or XX_ where XX is some project-specific code. What does Apple itself use? And what about protected methods? One solution I read was to use categories in separate files, for example CLASS_protected.h and CLASS_protected.m but this seems like it could get very bloated. What should I do?

问题 The XAML code is as follows: <Helper:BooleanVisibilityValueConverter x:Key="BoolToVisible" /> <Control x:Name="ResizeDecorator" MouseMove="ResizeDecorator_MouseMove" Template=" {StaticResource ResizeDecoratorTemplate}" Visibility="{Binding IsButtonVisible,Converter= {StaticResource ResourceKey=BoolToVisible},RelativeSource={RelativeSource TemplatedParent}}" /> <Helper:BooleanVisibilityValueConverter x:Key="BoolToVisible" /> <Control x:Name="ResizeDecorator" MouseMove="ResizeDecorator