鼠标移动对于`mouseMoveEvent()` 来说太快了 [英] Mouse movements too fast for `mouseMoveEvent()`

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本文介绍了鼠标移动对于`mouseMoveEvent()` 来说太快了的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

以下 Python 3 对应.UI XML 代码为每个鼠标方向(标记为 X+、X-、Y+、Y-)显示 4 个 QProgessBar.

The following Python 3 resp. UI XML code shows 4 QProgessBar for each mouse direction (labeled X+, X-, Y+, Y-).

快速的鼠标移动(在圆圈中)将使 4 个 QProgessBar 移动到 99% 然后一些 QProgessBar 休息一下，直到鼠标移动变慢最终达到 100%.

Fast mouse movements (in circles) will make the 4 QProgessBar move up to 99% and then some of the QProgessBar take a break until the mouse movements are slowed down to finally reach 100%.

  1. 这种行为的原因是什么?
  2. 如何修复代码以使 QProgessBar 在 99% 时不会中断?
  1. What's the reason for this behavior ?
  2. How can the code be fixed so that no QProgessBar takes a break at 99% ?

main.py

import sys
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QCursor
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.uic import loadUi


class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        loadUi("mainwindow.ui", self)
        self.showMaximized()
        self.setMouseTracking(True)
        self.centralWidget().setAttribute(Qt.WA_TransparentForMouseEvents)

        self._old_x = QCursor.pos().x()
        self._old_y = QCursor.pos().y()

    def _update_bar(self, progress_bar, delta):
        current_value = progress_bar.value()
        new_value = current_value + delta
        progress_bar.setValue(new_value)

    def mouseMoveEvent(self, event):
        new_x = event.x()
        new_y = event.y()

        if new_x > self._old_x:
            self._update_bar(self.progressBar_x_plus, new_x - self._old_x)
        if new_x < self._old_x:
            self._update_bar(self.progressBar_x_minus, self._old_x - new_x)

        if new_y > self._old_y:
            self._update_bar(self.progressBar_y_plus, new_y - self._old_y)
        if new_y < self._old_y:
            self._update_bar(self.progressBar_y_minus, self._old_y - new_y)

        self._old_x = new_x
        self._old_y = new_y


def main():
    app = QApplication(sys.argv)
    main_window = MainWindow()
    main_window.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

mainwindow.ui

mainwindow.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>300</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Mouse Pointer</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QGridLayout" name="gridLayout_2">
    <item row="0" column="0">
     <layout class="QGridLayout" name="gridLayout">
      <item row="0" column="0">
       <widget class="QLabel" name="label_x_plus">
        <property name="text">
         <string>X+</string>
        </property>
        <property name="alignment">
         <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignVCenter</set>
        </property>
       </widget>
      </item>
      <item row="0" column="1">
       <widget class="QProgressBar" name="progressBar_x_plus">
        <property name="maximum">
         <number>1000</number>
        </property>
        <property name="value">
         <number>0</number>
        </property>
       </widget>
      </item>
      <item row="1" column="0">
       <widget class="QLabel" name="label_x_minus">
        <property name="text">
         <string>X-</string>
        </property>
        <property name="alignment">
         <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignVCenter</set>
        </property>
       </widget>
      </item>
      <item row="1" column="1">
       <widget class="QProgressBar" name="progressBar_x_minus">
        <property name="maximum">
         <number>1000</number>
        </property>
        <property name="value">
         <number>0</number>
        </property>
       </widget>
      </item>
      <item row="2" column="0">
       <widget class="QLabel" name="label_y_plus">
        <property name="text">
         <string>Y+</string>
        </property>
        <property name="alignment">
         <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignVCenter</set>
        </property>
       </widget>
      </item>
      <item row="2" column="1">
       <widget class="QProgressBar" name="progressBar_y_plus">
        <property name="maximum">
         <number>1000</number>
        </property>
        <property name="value">
         <number>0</number>
        </property>
       </widget>
      </item>
      <item row="3" column="0">
       <widget class="QLabel" name="label_y_minus">
        <property name="text">
         <string>Y-</string>
        </property>
        <property name="alignment">
         <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignVCenter</set>
        </property>
       </widget>
      </item>
      <item row="3" column="1">
       <widget class="QProgressBar" name="progressBar_y_minus">
        <property name="maximum">
         <number>1000</number>
        </property>
        <property name="value">
         <number>0</number>
        </property>
       </widget>
      </item>
     </layout>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>800</width>
     <height>28</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>

推荐答案

1.这种行为的原因是什么?

请写print(self._old_x, new_x)看看结果.

就我而言，结果的一部分是这样的.

In my case, the part of results like this.

681 673
673 666
666 660
660 660
660 660
660 661
661 670
670 681
681 693
693 708
708 732
732 750
750 779

您可以看到 self._old_x 和 new_x 之间的相同位置.你还可以看到 self._old_x 在结果中比 new_x 多.

you can see the same position between self._old_x and new_x. and you can also see self._old_x is more than new_x in the result.

为什么会出现同样的位置?

很容易说... event.pos() 就是 QCursor.pos().但是你在 mouseMoveEvent() 的第一行调用了 event.x() 和 event.y().

It is easy to say... event.pos() is QCursor.pos(). But you call event.x() and event.y() at the first line in mouseMoveEvent().

在event.x()、event.y()调用和new_x、new_y更新之间，有很短的时间.所以有时没有时间移动1.这也是一个原因，但不是核心.

Between event.x(), event.y() calling and new_x, new_y updating, there are a very slight time.So there is no time for moving 1 sometimes. This is also a reason but it is not core.

并且请在_update_bar

progressBar_y_plus 394
progressBar_x_minus 368
progressBar_y_plus 400
progressBar_x_minus 372
progressBar_y_plus 405
progressBar_x_minus 375
progressBar_y_plus 409
progressBar_x_minus 378
progressBar_y_plus 412
progressBar_x_minus 381
progressBar_y_plus 415
progressBar_x_minus 383
progressBar_y_plus 418
progressBar_x_minus 387
progressBar_y_plus 424
progressBar_x_minus 389
progressBar_y_plus 427
progressBar_x_minus 394
progressBar_y_plus 431
progressBar_x_minus 397
progressBar_y_plus 434
progressBar_x_minus 400
progressBar_y_plus 438
progressBar_x_minus 404
progressBar_y_plus 443
progressBar_x_minus 409
progressBar_y_plus 449
progressBar_x_minus 414
progressBar_y_plus 454
progressBar_x_minus 419
progressBar_y_plus 458
progressBar_x_minus 423
progressBar_y_plus 463
progressBar_x_minus 428
progressBar_y_plus 468
progressBar_x_minus 436
progressBar_y_plus 476
progressBar_x_minus 440
progressBar_y_plus 479
progressBar_x_minus 448
progressBar_y_plus 484
progressBar_x_minus 456
progressBar_y_plus 489
progressBar_x_minus 462
progressBar_y_plus 493
progressBar_x_minus 467
progressBar_y_plus 495
progressBar_x_minus 475
progressBar_y_plus 497
progressBar_x_minus 482
progressBar_y_plus 500
progressBar_x_minus 489
progressBar_x_minus 503
progressBar_y_plus 504
progressBar_x_minus 515
progressBar_x_minus 529
progressBar_x_minus 541
progressBar_x_minus 559
progressBar_x_minus 575
progressBar_x_minus 598
progressBar_x_minus 619
progressBar_x_minus 631
progressBar_x_minus 657
progressBar_x_minus 675
progressBar_x_minus 679
progressBar_x_minus 682
progressBar_x_minus 707
progressBar_y_minus 807
progressBar_x_minus 742
progressBar_y_minus 818
progressBar_x_minus 767
progressBar_y_minus 819
progressBar_x_minus 799
progressBar_x_minus 814
progressBar_x_minus 825
progressBar_y_minus 822
progressBar_x_minus 842
progressBar_y_minus 823
progressBar_x_minus 857
progressBar_y_minus 825
progressBar_x_minus 863
progressBar_y_minus 826
progressBar_x_minus 877
progressBar_y_minus 831
progressBar_x_minus 892
progressBar_x_minus 907
progressBar_x_minus 918
progressBar_y_minus 835
progressBar_x_minus 928
progressBar_x_minus 931
progressBar_x_minus 936
progressBar_x_minus 940
progressBar_x_minus 945
progressBar_x_minus 949
progressBar_x_minus 952
progressBar_x_minus 956
progressBar_x_minus 959
progressBar_x_minus 963
progressBar_x_minus 970
progressBar_x_minus 975
progressBar_x_minus 980
progressBar_x_minus 987
progressBar_x_minus 992
progressBar_x_minus 998
progressBar_x_minus 1002
progressBar_x_minus 1001
progressBar_x_minus 1000
progressBar_x_minus 1004
progressBar_x_minus 1003
progressBar_x_minus 1001
progressBar_x_minus 1001
progressBar_x_minus 1001
progressBar_x_minus 1001
progressBar_x_plus 475
progressBar_x_plus 482
progressBar_x_plus 496
progressBar_x_plus 509
progressBar_x_plus 524
progressBar_x_plus 548
progressBar_x_plus 579
progressBar_x_plus 614
progressBar_x_plus 673
progressBar_x_plus 718
progressBar_x_plus 756
progressBar_x_plus 788
progressBar_x_plus 826
progressBar_x_plus 848
progressBar_y_minus 836
progressBar_x_plus 898
progressBar_y_plus 507
progressBar_x_plus 940
progressBar_x_plus 978
progressBar_x_plus 993
progressBar_x_plus 1014
progressBar_x_plus 1014
progressBar_x_plus 1010
progressBar_x_plus 1016
progressBar_x_plus 1015
progressBar_y_plus 509
progressBar_x_plus 1018
progressBar_x_plus 1012
progressBar_x_plus 1011
progressBar_x_plus 1000
progressBar_x_plus 1012
progressBar_x_plus 1019
progressBar_x_plus 1015
progressBar_x_plus 1012
progressBar_x_plus 1015
progressBar_x_plus 1019
progressBar_x_plus 1015
progressBar_x_plus 1015
progressBar_x_plus 1012
progressBar_x_plus 1014
progressBar_x_plus 1005
progressBar_x_plus 1003
progressBar_x_plus 1009
progressBar_y_minus 839
progressBar_x_plus 1008
progressBar_y_minus 841
progressBar_x_plus 1012
progressBar_y_minus 844
progressBar_x_plus 1011
progressBar_y_minus 848
progressBar_x_plus 1006
progressBar_y_minus 851
progressBar_x_plus 1007
progressBar_y_minus 855
progressBar_x_plus 1006
progressBar_y_minus 860
progressBar_x_plus 1007
progressBar_y_minus 865
progressBar_x_plus 1001
progressBar_y_minus 866
progressBar_x_plus 1001
progressBar_x_plus 1004
progressBar_y_minus 872
progressBar_x_plus 1005
progressBar_y_minus 881
progressBar_x_plus 1005
progressBar_y_minus 889
progressBar_x_plus 1007
progressBar_y_minus 898
progressBar_x_plus 1004
progressBar_y_minus 907
progressBar_x_plus 1005
progressBar_y_minus 917
progressBar_x_plus 1005
progressBar_y_minus 931
progressBar_x_plus 1004
progressBar_y_minus 941
progressBar_x_plus 1004
progressBar_y_minus 952
progressBar_x_plus 1005
progressBar_y_minus 965
progressBar_x_plus 1002
progressBar_y_minus 977
progressBar_x_plus 1001
progressBar_y_minus 991
progressBar_x_plus 1001
progressBar_y_minus 1004
progressBar_y_minus 1005
progressBar_x_plus 1003
progressBar_y_minus 1001
progressBar_y_minus 1007
progressBar_y_minus 1004
progressBar_y_minus 1005
progressBar_y_minus 1005
progressBar_x_minus 1003
progressBar_y_minus 1001
progressBar_x_minus 1004
progressBar_y_minus 1004
progressBar_y_minus 996
progressBar_x_minus 1006
progressBar_y_minus 1007
progressBar_x_minus 1008
progressBar_y_minus 1007
progressBar_x_minus 1007
progressBar_y_minus 1007
progressBar_x_minus 1008
progressBar_y_minus 1009
progressBar_x_minus 1009
progressBar_y_minus 1007
progressBar_x_minus 1005
progressBar_y_minus 1005
progressBar_x_minus 1010
progressBar_y_minus 1006
progressBar_x_minus 1007
progressBar_y_minus 1004
progressBar_x_minus 1010
progressBar_y_minus 1004
progressBar_x_minus 1008
progressBar_y_minus 1001
progressBar_x_minus 1008
progressBar_y_minus 1005
progressBar_x_minus 1013
progressBar_y_minus 1005
progressBar_x_minus 1012
progressBar_y_minus 1003
progressBar_x_minus 1023
progressBar_y_minus 1004
progressBar_x_minus 1013
progressBar_y_minus 1003
progressBar_x_minus 1016
progressBar_y_minus 1003
progressBar_x_minus 1015
progressBar_y_minus 1003
progressBar_x_minus 1014
progressBar_y_minus 1002
progressBar_x_minus 1018
progressBar_y_minus 1000
progressBar_x_minus 1015
progressBar_y_minus 1005
progressBar_x_minus 1009
progressBar_y_minus 1002
progressBar_x_minus 1018
progressBar_y_minus 1003
progressBar_x_minus 1015
progressBar_y_minus 1003
progressBar_x_minus 1014
progressBar_y_minus 1001
progressBar_x_minus 1015
progressBar_y_minus 1005
progressBar_x_minus 1009
progressBar_x_minus 1012
progressBar_y_minus 1001
progressBar_x_minus 1012
progressBar_x_minus 1014
progressBar_x_minus 1008
progressBar_x_minus 1014
progressBar_x_minus 1012
progressBar_x_minus 1015
progressBar_x_minus 1014
progressBar_x_minus 1012
progressBar_x_minus 1013
progressBar_x_minus 1014
progressBar_y_plus 512
progressBar_x_minus 1014
progressBar_y_plus 515
progressBar_x_minus 1014
progressBar_y_plus 519
progressBar_x_minus 1018
progressBar_y_plus 525
progressBar_x_minus 1009
progressBar_y_plus 528
progressBar_x_minus 1012
progressBar_y_plus 532
progressBar_x_minus 1013
progressBar_y_plus 536
progressBar_x_minus 1014
progressBar_y_plus 540
progressBar_x_minus 1010
progressBar_y_plus 546
progressBar_x_minus 1015
progressBar_y_plus 553
progressBar_x_minus 1012
progressBar_y_plus 558
progressBar_x_minus 1010
progressBar_y_plus 565
progressBar_x_minus 1012
progressBar_y_plus 572
progressBar_x_minus 1013
progressBar_y_plus 580
progressBar_x_minus 1008
progressBar_y_plus 586
progressBar_x_minus 1012
progressBar_y_plus 596
progressBar_x_minus 1010
progressBar_y_plus 604
progressBar_x_minus 1009
progressBar_y_plus 612
progressBar_x_minus 1010
progressBar_y_plus 623
progressBar_x_minus 1006
progressBar_y_plus 629
progressBar_x_minus 1007
progressBar_y_plus 637
progressBar_x_minus 1005
progressBar_y_plus 648
progressBar_x_minus 1003
progressBar_y_plus 655
progressBar_x_minus 1002
progressBar_y_plus 663
progressBar_x_minus 1003
progressBar_y_plus 673
progressBar_x_minus 1004
progressBar_y_plus 684
progressBar_x_minus 1001
progressBar_y_plus 693
progressBar_y_plus 702
progressBar_y_plus 712
progressBar_y_plus 713
progressBar_y_plus 718
progressBar_y_plus 724
progressBar_x_plus 1001
progressBar_y_plus 734
progressBar_x_plus 1002
progressBar_y_plus 743
progressBar_y_plus 757
progressBar_y_plus 769
progressBar_y_plus 780
progressBar_y_plus 794
progressBar_y_plus 803
progressBar_y_plus 815
progressBar_y_plus 822
progressBar_x_plus 1003
progressBar_y_plus 829
progressBar_x_plus 1002
progressBar_y_plus 836
progressBar_x_plus 1002
progressBar_y_plus 844
progressBar_x_plus 1004
progressBar_y_plus 850
progressBar_x_plus 1002
progressBar_y_plus 857
progressBar_x_plus 1004
progressBar_y_plus 865
progressBar_x_plus 1002
progressBar_y_plus 872
progressBar_x_plus 1006
progressBar_y_plus 880
progressBar_x_plus 1002
progressBar_y_plus 884
progressBar_x_plus 1002
progressBar_y_plus 893
progressBar_x_plus 1003
progressBar_y_plus 899
progressBar_x_plus 1003
progressBar_y_plus 905
progressBar_x_plus 1002
progressBar_y_plus 907
progressBar_x_plus 1002
progressBar_x_plus 1002
progressBar_y_plus 913
progressBar_x_plus 1001
progressBar_y_plus 918
progressBar_x_plus 1004
progressBar_y_plus 924
progressBar_x_plus 1001
progressBar_y_plus 927
progressBar_y_plus 931
progressBar_x_plus 1003
progressBar_y_plus 938
progressBar_x_plus 1002
progressBar_y_plus 941
progressBar_x_plus 1002
progressBar_y_plus 945
progressBar_x_plus 1004

原因 1.我假设 progressBar 将 1000 计为 100%.所以 990 ~ 999 计为 99%.为了停在 99%，这经常发生鼠标移动比以前变慢(因为鼠标指向屏幕边缘.)有时我们可以很快达到 100%.

Reason 1. I assume that progressBar counts 1000 as 100%.so 990 ~ 999 are counted as 99%. To stop at 99%, this often happens mousemoving get slower than before ( because the mouse point the edge of screen.) We can reach 100% very soon sometimes.

原因 2.

你将new_x、new_y更新为self.old_x、self.old_y，所以值几乎相等彼此之间，似乎很容易从 99 升到 100.大多数情况下，我们很快就能达到 100%.但事实并非总是如此.因为即使你加上 990 + 11，即使点数超过1000，进度条也不会变成100%...这就是停在99%的核心原因.

You update new_x, new_y to self.old_x, self.old_y, so the valuables almost equal to each other.It seems to go up to 100 from 99 easily.For the most part, we can reach 100% soon.But the fact is not always so.Because even if you plus 990 + 11 , even if the point is more than 1000, the progress bar doesn't become 100%... This is the core reason to stop at 99%.

对于证据，你写_update_bar，例如new_value = 900 + 11，你喜欢的任何数字，但结果必须大于1000.你的进度条绝对不会变成满.相反，它们根本不动.

For the evidence, you write _update_bar,for example, new_value = 900 + 11 , any number you like but it must be more than 1000 as the result.Your progress bars absolutely don't become full.Rather, they don't move at all.

progressBar_y_minus 992
109 132
progressBar_y_minus 1012
98 121

我希望你慢慢移动鼠标.你可以看到你比你更快地移动鼠标更容易达到 100%.因为问题是 9** ~ 1000 的移动宽度.

I would you like to move mouse slowly.You can see you reach 100% easier than you move mouse faster.Because the problem was the movement width of 9** ~ 1000.

如果你快速移动鼠标，self._pos_x 和 event.pos().x() 会产生很大的宽度.为此，它会导致无法达到 100%，反之亦然.

If you move the mouse faster, the self._pos_x and event.pos().x() will make a big width.For this, it results in not being able to reach 100% vice versa.

所以如果我把鼠标从我的电脑窗口的左边位置快速移动到它的右边位置，进度条根本不会增加.如果你在99%，效果会很明显.

So If I move the mouse from the left position of my pc window to right position of it very fast,the progress bar doesn't increase at all.If you are at 99%, the effect appears clearly.

当你在鼠标移动时圈出时，你经常会看到 99%.但我认为如果你慢慢来，你可以毫无问题地达到 100%.盘旋包含所有方向的移动.它不是一个进度条.直到一个移动结束，下一个有时不会增加.我假设环绕使宽度一点一点，比其他移动更容易达到99％.假新闻.

When you circle the moving of mouse, you often see 99%. But I think if you do it slowly, you can reach 100% with no problem. circling contains all direction moving.It is not for one progressbar. Until one moving ends, the next sometimes doesn't increase. I assume that circling makes the width little by little, it is easier to reach 99% than other moving. fake news.

与桌面大小无关.

2.如何修复代码，使 QProgessBar 在 99% 时不会中断?

如果你理解了 1 的解释，你可以通过这段代码避免停止.

If you understand the explanation of 1, you can escape from stopping by this code.

请尝试将这段代码写在_update_bar y punto...

please try to write this code in _update_bar y punto...

if new_value > 1000:
   new_value = 1000

这篇关于鼠标移动对于`mouseMoveEvent()` 来说太快了的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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