repaint

问题 Is it possible to repaint a window when there are no active users logged on to a windows machine using c sharp? And will that window be available to screen capture program? Or is it not possible at all and a user must be logged into the machine. I make use of the below: SetForegroundWindow(handle); InvalidateRect(IntPtr.Zero, IntPtr.Zero, true); UpdateWindow(handle); Thanks all for any help 回答1: Since there is no user logged in, there is no UI running. So, no, you can't repaint under such

问题 I am trying to draw something on a live video. The best way to do that in my opinion is to handle the WM_PIANT event. My purpose is to make the player draw first and after that the application. That way I will be able to draw on the video. It means that I want to be notified each time before we need to paint a new frame on the window and then handle the event. I use DirectshowNet so I am programming in C# (I have all the interfaces the c++'s API has). I understand that the graph manager

问题 I've read on SO and elsewhere that re-paints and re-flows are expensive for the browser to perform. I'm curious about CSS/JS alternatives to re-paint/ display:none and re-flow/ visibility:hidden that aren't as computationally demanding for the browser. Just to be clear, and please correct me if I'm wrong, a common re-flow scenario is when you set display:none on element that you want to toggle the display of, e.g., a dropdown menu. The re-flow means that the browser first "flows", i.e.,

问题 I'm facing a problem where a JPanel takes data from an object which has a cycle updating its state variables. The scenario is as follows: a JFrame calls a method of the object, the method creates the second JFrame has a cycle then updating a state variable. The second JFrame access that variable and should be displayed in a JPanel, but no, the GUI hangs. I reduced the problem to an example with the same behavior so it can be easily tested. I appreciate any help, thanks! Starter.java public

问题 Ok so I am very new to Java Swing and a beginner in Java in general. My current problem is I have designed a "cityscape". I am working on a UFO flying around, but my randomly generated buildings continue to get regenerated. I am wondering if there is a way to save my instance of buildings to an ArrayList as I have attempted, and paint that selection from that list each time paint is called. I tried what I thought of and I believe it just crashed it when run, because it didn't even open a

问题 I have this situation with DataGridView in Winforms. I want to achive something like this, with some separation between rows The image and address N39 are actually on 2 columns, with no horizontal margin and no column grid line to make it look like they belong to a whole. To achieve sepration between rows, I override CellPainting and repaint the whole grid, using from Graphics.FillRectangle (with height less than cell height), Graphics.DrawLine to Graphics.DrawString and Graphics.DrawText to

问题 I have two JTables. One is for the list of invoices and the other is for the list of products in invoices. I have created a listener so that I can get id value of invoices from first JTable with a mouse click, then using another method I generate a new table content for other table (method works fine). However, after updating table, I have tried to find ways to refresh it, unsuccessfully... I'm just looking for a way to refresh the second table the moment I trigger the mouse event Here are

问题 I have a form in which i paint a waveform on a button click that is as soon as i click button, the waveform displays. Now when i minimize the form and maximize it again, the waveform disappears.How to repaint it? I have seen people using paint event but i dont know how to use it after/inside the button click event. Please help. 回答1: If you call Control.Invalidate(), the Paint event will occur. 来源： https://stackoverflow.com/questions/2665900/how-do-i-repaint-a-form-after-it-was-restored-from-a

问题 I'm having trouble getting my JLabels in a 2D array to update during runtime. The program I'm working on is a variant of Connect Four. I create a 2D array of JLabels, which all default to an ImageIcon containing an image of a blank slot. Players 1 and 2 choose their colors, and on a player's turn, he can click to drop a piece into a column (gravity causes the piece to fall to the bottom or until it lands atop another piece). I'm pretty positive that my addToColumn method is working fine. My

问题 I have been suffering from a bug for sometime: I am doing something like the following: $container.on('touchmove', function(){ $container.trigger( 'lazyload.appear'); }); $img.one( 'lazyload.appear', function(){ var that= this; var $self= $(that); $self.css('background-image', "url('real.path.to.img')" ); }); However, on IOS there seems to be a problem with repainting the background-images, when they are initially outside the viewport. When I drag my finger, until the image is in the viewport