visible

来源： https://www.cnblogs.com/Accpted/p/11334387.html

This question already has an answer here: Android: how to check if a View inside of ScrollView is visible? 13 answers I set visibility to invisible like this on Android: myImageView.setVisibility(View.INVISIBLE); And then to make it visible: myImageView.setVisibility(View.VISIBLE); Now I don't know if myImageView is visible or not, how can I check it like this: if (myImageView IS VISIBLE) { Do something } else { Do something else } How can I do that? What do I have to write within the brackets? Although View.getVisibility() does get the visibility, its not a simple true/false. A view can have

I need to retrieve the visible height of a div within a scrollable area. I consider myself pretty decent with jQuery, but this is completely throwing me off. Let's say I've got a red div within a black wrapper: In the graphic above, the jQuery function would return 248, the visible portion of the div. Once the user scrolls past the top of the div, as in the above graphic, it would report 296. Now, once the user has scrolled past the div, it would again report 248. Obviously my numbers aren't going to be as consistent and clear as they are in this demo, or I'd just hard code for those numbers.

I have a UITableView with cells of different heights and I need to know when they are completely visible or not. At the moment I am looping through each cell in the list of visible cells to check if it is completely visible every time the view is scrolled . Is this the best approach? Here's my code: - (void)scrollViewDidScroll:(UIScrollView *)aScrollView { CGPoint offset = aScrollView.contentOffset; CGRect bounds = aScrollView.bounds; NSArray* cells = myTableView.visibleCells; for (MyCustomUITableViewCell* cell in cells) { if (cell.frame.origin.y > offset.y && cell.frame.origin.y + cell.frame

I have a problem. I need to hide my window at window load. But private void Form1_Load(object sender, EventArgs e) { this.Visible = false; } is not working. And property Visible remains true. Am I missing something? Yes, the Visible property is a big deal in Windows Forms, that's what actually gets the handle created and causes OnLoad() to run. In other words, the window doesn't exist until it gets visible. And it will ignore attempts to undo this. It is pretty common to want to still create the handle but not make the window visible if you use a NotifyIcon. You can achieve this by overriding

首先，今天是9月18日。先默哀，纪念 九一八事件 今天我看到了一段这样的js。 Code < script > function sh(s){ if ( ! $(s)) return ; $(s).style.display = $(s).style.display == " none " ? " block " : " none " ;} function hs(s){ if ( ! $(s)) return ; $(s).style.display = $(s).style.display == " block " ? " none " : " block " ;} function vv(s){ if ( ! $(s)) return ; $(s).style.visibility = " visible " ;} function vh(s){ if ( ! $(s)) return ; $(s).style.visibility = " hidden " ;} </ script > 以前写代码只知道有一个显示隐藏是obj.style.display="none"或者obj.style.display="block" 今天看到了一个visibility.看表面意思应该也就是显示隐藏。 那为什么JS已经有display了，还增加一个visibility呢，多此一举？

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