repaint | 易学教程

In the dev tools timeline, what are the empty green rectangles?

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In the Chrome dev tools timeline, what is the difference between the filled, green rectangles (which represent paint operations) and the empty, green rectangles (which apparently also represent something about paint operations...)? Painting is really two tasks: draw calls and rasterization. Draw calls . This is a list of things you'd like to draw, and its derived from the CSS applied to your elements. Ultimately there is a list of draw calls not dissimilar to the Canvas element's: moveTo, lineTo, fillRect (though they have slightly different names in Skia, Chrome's painting backend, it's a

Force browser to immediately repaint a dom element

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问题 I need to insert a huge html markup to some dom element which will take awhile. It is a reason why I want to display some preloader indicator. I have two blocks: #preloader and #container. Some code displays the preloader firstly and then starts to paste a big html markup. The problem - preloader hasn't really displayed until browser will not finish render html markup. I've tried a lot of solutions (a lot of them are described here) but still haven't success. An example is avalable below:

Repaint does not update the screen

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问题 I would like to repaint my screen. As of now all it does is show the first screen with a dot where the head is supposed to be. This is fine, however I've written in my code that I want to move the head down 10 pixels every second. I'm printing at what point the head is supposed to be at, and in the command prompt it shows that the y value is indeed increasing. However on my screen the head is not moving. I have tried using the revalidate method, trying to extend the canvas class instead of

why Java repaint() method not working?

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问题 The code below is a very simple test which involves an image. It should repaint an image whenever I send "a" to System.in and it should exit the program whenever I send "q". The problem is that only the exit works: the method paint() is never called, and I don't why. I checked for the call to "super.paint()", tried replacing paint(Graphics g) with paintCompoenent(Graphics g) but nothing seems to work: simply there's no call. Is the problem involving the Scanner in main()? The path in the

Repaint does not update the screen

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I would like to repaint my screen. As of now all it does is show the first screen with a dot where the head is supposed to be. This is fine, however I've written in my code that I want to move the head down 10 pixels every second. I'm printing at what point the head is supposed to be at, and in the command prompt it shows that the y value is indeed increasing. However on my screen the head is not moving. I have tried using the revalidate method, trying to extend the canvas class instead of jframe, I have tried using different classes just for the paint method, i have tried replacing the paint

X11: How to delay repainting until all events are processed?

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问题 I'm writing a program that has an X11/Xlib interface, and my event processing loop looks like this: while (XNextEvent(display, &ev) >= 0) { switch (ev.type) { // Process events } } The problem is when the window is resized, I get a bunch of Expose events telling me which parts of the window to redraw. If I redraw them in direct response to the events, the redraw operation lags terribly because it is so slow (after resizing I get to see all the newly invalidated rectangles refresh one by one.)

Force browser to immediately repaint a dom element

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I need to insert a huge html markup to some dom element which will take awhile. It is a reason why I want to display some preloader indicator. I have two blocks: #preloader and #container. Some code displays the preloader firstly and then starts to paste a big html markup. The problem - preloader hasn't really displayed until browser will not finish render html markup. I've tried a lot of solutions (a lot of them are described here ) but still haven't success. An example is avalable below: https://jsfiddle.net/f9f5atzu/ <div id='preloader'>Preloader...</div> <div id='container'>Container...<

Repaint is not functioning properly as required

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问题 I have built a tetris game. Now in that I have used a JPanel for displaying content and the blocks (using the paintComponents() method). The problem is whenever I try to call the tetris program from another JFrame it does not paint at all. The code for my tetris main menu is: import javax.swing.*; import sun.audio.AudioPlayer; import sun.audio.AudioStream; import java.awt.*; import java.awt.event.*; import java.io.FileInputStream; import java.io.InputStream; @SuppressWarnings("serial") public

Java Swing — Writing a Ui that will repaint itself based on changes to a custom data object

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问题 First things first -- I had posted a question earlier wherein i had asked for help as to why my code was not working and this question is acting upon the advice i got in that question. My use case is this. Im writing a MethodEditor module wherein every Method is denoted by a custom data object that has 2 data members -- List of input variable names String(name of the result variable that this method sets). These Method objects are generated as a result of filling out some data on a JDialog .

How to add time delay between adding components to JFrame?

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问题 I created a JFrame, and it contains a JPanel. I created a number of JLabels. I can add the JLabels to the JPanel, and display them correctly. But I want to implement them so as they displayed sequentially ; a time delay between each JLabel to be displayed. After searching the StackOverfLow, I tried some code, but it has no effect!. So How to use a timer to make components(Labels) displayed one after the other by setting a time delay. I Don't want a fix for my code particularly in the answer.