blocks|key|1929967|text|在输入代码之前，您应该能够处理事件队列；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1929968|#include+<QApplication>|code-block|syntax|javascript|1929969|当你想刷新你的图形用户界面时，调用；|1929970|qApp->processEvents();|1929971|请注意，让您的长时间运行的流程不时地调用该函数可能是一个好主意，以使您的GUI感觉更具响应性。|1929972|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You shuld be able to process the event queue before entering your code if you;

<pre><code>#include &lt;QApplication&gt;
</code></pre>

and, when you want to refresh your GUI, call;

<pre><code>qApp-&gt;processEvents();
</code></pre>

Note that it may be a good idea to let your long running process call that function now and then, to make your GUI feel more responsive.

blocks|key|1930058|text|如果您不关心图形用户界面在这段时间内的响应，那么调用my_label->repaint()就可以了。Qt不能自动为您做任何事情，除非您屈从于事件循环。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1930059|为了获得最大的响应速度，您可以考虑在单独的线程中运行进程，并使用信号/槽连接(默认情况下是线程安全的)在处理完成时向主GUI线程发出信号。|1930060|entityMap^0|Q|J|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

If you don't care about your GUI being responsive during this time, then a call to <code>my_label-&gt;repaint()</code> would do the trick. Qt can't do anything automatically for you unless you yield to the event loop.

For maximimum responsiveness you might consider running your process in a separate thread and use signal/slot connections (which are thread-safe by default) to signal to your main GUI thread when your processing is complete.

blocks|key|1930307|text|我只想补充一点，对我来说，这是我在这里看到的两个答案的组合。所以对我来说起作用的是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1930308|ui.my_label->setText("Test+1...");
ui.my_label->adjustSize();

//!+Both+of+these+lines+needed
ui.my_label->repaint();
qApp->processEvents();

processThatTakesAbout30SecondsToFinish(files[0].toStdString());

ui.my_label->setText("Finished.");
ui.my_label->adjustSize();|code-block|syntax|javascript|1930309|希望这对某些人有帮助。|1930310|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I just wanted to add that for me it took a combo of the two answers I saw here. So what worked for me was:

<pre><code>ui.my_label-&gt;setText("Test 1...");
ui.my_label-&gt;adjustSize();

//! Both of these lines needed
ui.my_label-&gt;repaint();
qApp-&gt;processEvents();

processThatTakesAbout30SecondsToFinish(files[0].toStdString());

ui.my_label-&gt;setText("Finished.");
ui.my_label-&gt;adjustSize();
</code></pre>

Hope this helps someone.

blocks|key|1930389|text|定义函数...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1930390|void+YourClass::Update_Ui()
{
if(this->isEnabled())
++++return;

this->repaint();
qApp->processEvents();
}|code-block|syntax|javascript|1930391|当你想强制更新ui时，对我来说最好的解决方案是...like，并确保this被禁用(以防止用户操作)。|offset|length|style|CODE|1930392|示例如何在函数中使用它(例如，在耗费大量时间的堆栈处理过程中)：|1930393|this->setEnabled(false);
//Do+whatever+you+want
Update_Ui();
//Do+some+other+stuff
this->setEnabled(true);|1930394|这不允许用户通过ui交互(它被禁用)来干扰处理，并且每当在代码中调用Update_Ui();并更新整个ui时进行更新，而不仅仅是所选的标签或其他东西。请注意，这并不会阻止ui元素发出的信号。|1930395|entityMap^0|0|0|7|2|Y|4|0|0|0|8|2|Y|C|1F|2|2D|2|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@$I|X|J|Y|K|L]|$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|13|8|@$I|14|J|15|K|L]|$I|16|J|17|K|L]|$I|18|J|19|K|L]|$I|1A|J|1B|K|L]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|T|$]]

Defining a function...

<pre><code>void YourClass::Update_Ui()
{
if(this-&gt;isEnabled())
 return;

this-&gt;repaint();
qApp-&gt;processEvents();
}
</code></pre>

...like this and make sure <code>this</code> is disabled (to prevent user actions) while you want to force an update of the <code>ui</code> was the best solution for me.

Example how to use it inside a function (for example during a stack processing that takes lots of time):

<pre><code>this-&gt;setEnabled(false);
//Do whatever you want
Update_Ui();
//Do some other stuff
this-&gt;setEnabled(true);
</code></pre>

This doesn't allow the user to disturb the processing by <code>ui</code> interaction (it is disabled) and updates whenever <code>Update_Ui();</code> is called in the code and updates the whole <code>ui</code>, not just a chosen label or whatever. Note that this doesn't block signals fired by <code>ui</code> elements.

This seems like it should be automatic, but apparently it's not. I have the following code:

<pre><code> ui.my_label-&gt;setText("Test 1...");
 ui.my_label-&gt;adjustSize();

 processThatTakesAbout30SecondsToFinish(files[0].toStdString());

 ui.my_label-&gt;setText("Finished.");
 ui.my_label-&gt;adjustSize();
</code></pre>

What is happening is that I never see <code>"Test1...",</code> as the GUI seems to hang until the following function completes, and I eventaully only see "Finished.". 

How can I make sure the GUI is updating before it enters that function? 
Thanks.

Forcing the Qt GUI to update before entering a separate function

这看起来应该是自动的，但显然不是。我有以下代码：    ui.my_label->setText("Test 1...");    ui.my_label->adjustSize();    processThatTakesAbout30SecondsToFinish(files[0].toStdString()); ...

问在进入单独的函数之前强制更新Qt GUI
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