dynamic-sizing | 易学教程

Angular Material Side Bar with “Half” side mode

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问题 I am working on the dynamic side bar for our project, basically what we want to do is to set up a dynamic side bar when user click on the side bar it will spread when user click back sidebar should collapse and show only icons (but not totally collapse it will keep the icons) for example before user click the icon. We are using sidenav.toggle()from angular material function which basically closes the sidebar completely and if I don't use toggle() function "Side" mode for navbar does not work.

Angular Material Side Bar with “Half” side mode

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Set the JPanel size to fill parent with little margin

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问题 I have two Jpanel ( JpanelLeft and JpanelLeftContent ) how can i make the JpanelLeftContent fill parent size with a little margin on the left an right side. i have tried different layout and tried to modify the hgap and vgap values, but none of them give me a good result. JPanel JpanelLeft = new JPanel(); JPanel JpanelLeftContent = new JPanel(); JpanelLeft.add(JpanelLeftContent); And if possible how can i make the JpanelLeftContent look like a rounded rectangle as shown in the picture. 回答1:

Why can't I write a function with the same type as Box::new?

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问题 If I write a function that takes one argument of type [f32] (as opposed to e.g. &[f32] ), I get an error: the trait bound `[f32]: std::marker::Sized` is not satisfied The docs say this is because [f32] does not have a compile-time-known size. A reasonable limitation. Fair enough. However, there is at least one function in the standard library with this type. Here's me calling it: let b: Box<[f32]> = Box::new([1.0, 2.0, 3.0]); How come this is allowed in the standard library and not in my code

Proper way to declare a variable length two dimensional array in C++

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问题 I would like to get a two dimensional int array arr that I can access via arr[i][j]. As far as I understand I could declare int arr[10][15]; to get such an array. In my case the size is however variable and as far as I understand this syntax doesn't work if the size of the array isn't hardcoded but I use a variable like int arr[sizeX][sizeY] . What's the best workaround? 回答1: If you don't want to use a std::vector of vectors (or the new C++11 std::array) then you have to allocate all sub

dynamically-sized text object with a copy constructor, a trivial assignment operator, and a trivial destructor

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问题 I've been shown that a std::string cannot be inserted into a boost::lockfree::queue . boost::lockfree::queue is too valuable to abandon, so I think I could use very large, fixed length char s to pass the data according to the requirements (assuming that even satifies since I'm having trouble learning about how to satisfy these requirements), but that will eat up memory if I want large messages. Does a dynamically-sized text object with a copy constructor, a trivial assignment operator, and a

dynamically-sized text object with a copy constructor, a trivial assignment operator, and a trivial destructor

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I've been shown that a std::string cannot be inserted into a boost::lockfree::queue . boost::lockfree::queue is too valuable to abandon, so I think I could use very large, fixed length char s to pass the data according to the requirements (assuming that even satifies since I'm having trouble learning about how to satisfy these requirements), but that will eat up memory if I want large messages. Does a dynamically-sized text object with a copy constructor, a trivial assignment operator, and a trivial destructor exist? If so, where? If not, please outline how to manifest one. A dynamically-size