Qt Designer - 为什么调整 LCD 数字大小时数字会被推到左边？

Question

我正在 Qt Designer（Qt 版本：5.15.2）中构建一个非常基本的计算器演示应用程序。我注意到当我调整窗口大小时，LCD 数字显示中的数字被推到左边。为什么会出现这种情况？

调整大小之前：

调整大小后：

Answer 1

我放了一个horizontalSpacer输出是这样的，试试这个：

<?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>473</width>
    <height>274</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</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="3" column="0">
       <widget class="QPushButton" name="radicalButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>√</string>
        </property>
        <property name="flat">
         <bool>false</bool>
        </property>
       </widget>
      </item>
      <item row="1" column="2">
       <widget class="QPushButton" name="mMinusButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>M-</string>
        </property>
       </widget>
      </item>
      <item row="5" column="3">
       <widget class="QPushButton" name="equalsButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>=</string>
        </property>
       </widget>
      </item>
      <item row="1" column="0">
       <widget class="QPushButton" name="offButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>OFF</string>
        </property>
       </widget>
      </item>
      <item row="2" column="4">
       <widget class="QPushButton" name="timesButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>×</string>
        </property>
       </widget>
      </item>
      <item row="2" column="3">
       <widget class="QPushButton" name="button9">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>9</string>
        </property>
       </widget>
      </item>
      <item row="5" column="0">
       <widget class="QPushButton" name="acButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>AC</string>
        </property>
       </widget>
      </item>
      <item row="2" column="0">
       <widget class="QPushButton" name="percentButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>%</string>
        </property>
       </widget>
      </item>
      <item row="4" column="2">
       <widget class="QPushButton" name="button2">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>2</string>
        </property>
       </widget>
      </item>
      <item row="4" column="0">
       <widget class="QPushButton" name="cButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>C</string>
        </property>
       </widget>
      </item>
      <item row="4" column="3">
       <widget class="QPushButton" name="button3">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>3</string>
        </property>
       </widget>
      </item>
      <item row="1" column="4">
       <widget class="QPushButton" name="divideButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>÷</string>
        </property>
       </widget>
      </item>
      <item row="5" column="2">
       <widget class="QPushButton" name="dotButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>.</string>
        </property>
       </widget>
      </item>
      <item row="3" column="1">
       <widget class="QPushButton" name="button4">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>4</string>
        </property>
       </widget>
      </item>
      <item row="5" column="1">
       <widget class="QPushButton" name="button0">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>0</string>
        </property>
       </widget>
      </item>
      <item row="4" column="1">
       <widget class="QPushButton" name="button1">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>1</string>
        </property>
       </widget>
      </item>
      <item row="1" column="1">
       <widget class="QPushButton" name="mrcButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>MRC</string>
        </property>
       </widget>
      </item>
      <item row="3" column="2">
       <widget class="QPushButton" name="button5">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>5</string>
        </property>
       </widget>
      </item>
      <item row="1" column="3">
       <widget class="QPushButton" name="mPlusButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>M+</string>
        </property>
       </widget>
      </item>
      <item row="2" column="1">
       <widget class="QPushButton" name="button7">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>7</string>
        </property>
       </widget>
      </item>
      <item row="2" column="2">
       <widget class="QPushButton" name="button8">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>8</string>
        </property>
       </widget>
      </item>
      <item row="3" column="3">
       <widget class="QPushButton" name="button6">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>6</string>
        </property>
       </widget>
      </item>
      <item row="3" column="4">
       <widget class="QPushButton" name="minusButton">
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>-</string>
        </property>
       </widget>
      </item>
      <item row="4" column="4" rowspan="2">
       <widget class="QPushButton" name="plusButton">
        <property name="sizePolicy">
         <sizepolicy hsizetype="Minimum" vsizetype="Minimum">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
        <property name="cursor">
         <cursorShape>PointingHandCursor</cursorShape>
        </property>
        <property name="text">
         <string>+</string>
        </property>
       </widget>
      </item>
      <item row="0" column="4">
       <widget class="QLCDNumber" name="lcdNumber">
        <property name="enabled">
         <bool>true</bool>
        </property>
        <property name="sizePolicy">
         <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
          <horstretch>0</horstretch>
          <verstretch>0</verstretch>
         </sizepolicy>
        </property>
        <property name="cursor">
         <cursorShape>ForbiddenCursor</cursorShape>
        </property>
        <property name="autoFillBackground">
         <bool>true</bool>
        </property>
        <property name="frameShape">
         <enum>QFrame::NoFrame</enum>
        </property>
        <property name="frameShadow">
         <enum>QFrame::Raised</enum>
        </property>
        <property name="smallDecimalPoint">
         <bool>false</bool>
        </property>
        <property name="digitCount">
         <number>1</number>
        </property>
        <property name="segmentStyle">
         <enum>QLCDNumber::Flat</enum>
        </property>
        <property name="value" stdset="0">
         <double>0.000000000000000</double>
        </property>
        <property name="intValue" stdset="0">
         <number>0</number>
        </property>
       </widget>
      </item>
      <item row="0" column="0" colspan="4">
       <spacer name="horizontalSpacer">
        <property name="orientation">
         <enum>Qt::Horizontal</enum>
        </property>
        <property name="sizeHint" stdset="0">
         <size>
          <width>40</width>
          <height>20</height>
         </size>
        </property>
       </spacer>
      </item>
     </layout>
    </item>
   </layout>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>